diff --git a/packages/websocket/src/client/index.ts b/packages/websocket/src/client/index.ts
index 19e82c03..7cfbb9d9 100644
--- a/packages/websocket/src/client/index.ts
+++ b/packages/websocket/src/client/index.ts
@@ -23,7 +23,7 @@ export class WebSocketManager {
     }
 }
 
-export const managers = new WebSocketManager()
+export const manager = new WebSocketManager()
 
 export class WebSocket extends EventEmitter {
     public static CONNECTING = 0
@@ -31,6 +31,7 @@ export class WebSocket extends EventEmitter {
     public static CLOSING = 2
     public static CLOSED = 3
     public binaryType: 'blob' | 'arraybuffer'
+    protected manager: WebSocketManager
 
     protected _url: string
     protected _headers: WebSocketHeader = {}
@@ -39,6 +40,7 @@ export class WebSocket extends EventEmitter {
 
     constructor(url: string, subProtocol: string = '', headers: WebSocketHeader = {}) {
         super()
+        this.manager = manager
         this._url = url
         this._headers = headers
         try {
@@ -51,12 +53,12 @@ export class WebSocket extends EventEmitter {
         }
         this.client.on('open', (event) => {
             this.onopen?.(event)
-            managers.add(this)
+            manager.add(this)
         })
         this.client.on('message', (event) => this.onmessage?.(event))
         this.client.on('close', (event) => {
             this.onclose?.(event)
-            managers.del(this)
+            manager.del(this)
         })
         this.client.on('error', (event) => this.onerror?.(event))
         setTimeout(() => this.client.connect(), 20)
diff --git a/packages/websocket/src/engine.io-parser/commons.ts b/packages/websocket/src/engine.io-parser/commons.ts
new file mode 100644
index 00000000..9928c92b
--- /dev/null
+++ b/packages/websocket/src/engine.io-parser/commons.ts
@@ -0,0 +1,21 @@
+const PACKET_TYPES = Object.create(null) // no Map = no polyfill
+PACKET_TYPES["open"] = "0"
+PACKET_TYPES["close"] = "1"
+PACKET_TYPES["ping"] = "2"
+PACKET_TYPES["pong"] = "3"
+PACKET_TYPES["message"] = "4"
+PACKET_TYPES["upgrade"] = "5"
+PACKET_TYPES["noop"] = "6"
+
+const PACKET_TYPES_REVERSE = Object.create(null)
+Object.keys(PACKET_TYPES).forEach(key => {
+    PACKET_TYPES_REVERSE[PACKET_TYPES[key]] = key
+})
+
+const ERROR_PACKET = { type: "error", data: "parser error" }
+
+export = {
+    PACKET_TYPES,
+    PACKET_TYPES_REVERSE,
+    ERROR_PACKET
+}
diff --git a/packages/websocket/src/engine.io-parser/decodePacket.ts b/packages/websocket/src/engine.io-parser/decodePacket.ts
new file mode 100644
index 00000000..9387ffff
--- /dev/null
+++ b/packages/websocket/src/engine.io-parser/decodePacket.ts
@@ -0,0 +1,48 @@
+const { PACKET_TYPES_REVERSE, ERROR_PACKET } = require("./commons")
+
+export const decodePacket = (encodedPacket, binaryType) => {
+    if (typeof encodedPacket !== "string") {
+        return {
+            type: "message",
+            data: mapBinary(encodedPacket, binaryType)
+        }
+    }
+    const type = encodedPacket.charAt(0)
+    if (type === "b") {
+        const buffer = Buffer.from(encodedPacket.substring(1), "base64")
+        return {
+            type: "message",
+            data: mapBinary(buffer, binaryType)
+        }
+    }
+    if (!PACKET_TYPES_REVERSE[type]) {
+        return ERROR_PACKET
+    }
+    return encodedPacket.length > 1
+        ? {
+            type: PACKET_TYPES_REVERSE[type],
+            data: encodedPacket.substring(1)
+        }
+        : {
+            type: PACKET_TYPES_REVERSE[type]
+        }
+}
+
+const mapBinary = (data, binaryType) => {
+    switch (binaryType) {
+        case "arraybuffer":
+            return Buffer.isBuffer(data) ? toArrayBuffer(data) : data
+        case "nodebuffer":
+        default:
+            return data // assuming the data is already a Buffer
+    }
+}
+
+const toArrayBuffer = buffer => {
+    const arrayBuffer = new ArrayBuffer(buffer.length)
+    const view = new Uint8Array(arrayBuffer)
+    for (let i = 0; i < buffer.length; i++) {
+        view[i] = buffer[i]
+    }
+    return arrayBuffer
+}
diff --git a/packages/websocket/src/engine.io-parser/encodePacket.ts b/packages/websocket/src/engine.io-parser/encodePacket.ts
new file mode 100644
index 00000000..a5c16491
--- /dev/null
+++ b/packages/websocket/src/engine.io-parser/encodePacket.ts
@@ -0,0 +1,26 @@
+const { PACKET_TYPES } = require("./commons")
+
+export const encodePacket = ({ type, data }, supportsBinary, callback) => {
+    console.trace('encodePacket', type, JSON.stringify(data))
+    if (data instanceof ArrayBuffer || ArrayBuffer.isView(data)) {
+        const buffer = toBuffer(data)
+        return callback(encodeBuffer(buffer, supportsBinary))
+    }
+    // plain string
+    return callback(PACKET_TYPES[type] + (data || ""))
+}
+
+const toBuffer = data => {
+    if (Buffer.isBuffer(data)) {
+        return data
+    } else if (data instanceof ArrayBuffer) {
+        return Buffer.from(data)
+    } else {
+        return Buffer.from(data.buffer, data.byteOffset, data.byteLength)
+    }
+}
+
+// only 'message' packets can contain binary, so the type prefix is not needed
+const encodeBuffer = (data, supportsBinary) => {
+    return supportsBinary ? data : "b" + data.toString("base64")
+}
diff --git a/packages/websocket/src/engine.io-parser/index.ts b/packages/websocket/src/engine.io-parser/index.ts
new file mode 100644
index 00000000..d68fed36
--- /dev/null
+++ b/packages/websocket/src/engine.io-parser/index.ts
@@ -0,0 +1,42 @@
+import { encodePacket } from "./encodePacket"
+import { decodePacket } from "./decodePacket"
+
+const SEPARATOR = String.fromCharCode(30) // see https://en.wikipedia.org/wiki/Delimiter#ASCII_delimited_text
+
+const encodePayload = (packets, callback) => {
+    // some packets may be added to the array while encoding, so the initial length must be saved
+    const length = packets.length
+    const encodedPackets = new Array(length)
+    let count = 0
+
+    packets.forEach((packet, i) => {
+        // force base64 encoding for binary packets
+        encodePacket(packet, false, encodedPacket => {
+            encodedPackets[i] = encodedPacket
+            if (++count === length) {
+                callback(encodedPackets.join(SEPARATOR))
+            }
+        })
+    })
+}
+
+const decodePayload = (encodedPayload, binaryType) => {
+    const encodedPackets = encodedPayload.split(SEPARATOR)
+    const packets = []
+    for (let i = 0; i < encodedPackets.length; i++) {
+        const decodedPacket = decodePacket(encodedPackets[i], binaryType)
+        packets.push(decodedPacket)
+        if (decodedPacket.type === "error") {
+            break
+        }
+    }
+    return packets
+}
+
+export default {
+    protocol: 4,
+    encodePacket,
+    encodePayload,
+    decodePacket,
+    decodePayload
+}
diff --git a/packages/websocket/src/engine.io/index.ts b/packages/websocket/src/engine.io/index.ts
new file mode 100644
index 00000000..7cffba16
--- /dev/null
+++ b/packages/websocket/src/engine.io/index.ts
@@ -0,0 +1,27 @@
+/**
+ * Module dependencies.
+ */
+
+import * as server from "../server"
+// const http = require("http")
+// const Server = require("./server")
+import { Server } from './server'
+
+/**
+ * Captures upgrade requests for a http.Server.
+ *
+ * @param {http.Server} server
+ * @param {Object} options
+ * @return {Server} engine server
+ * @api public
+ */
+
+function attach(srv, options) {
+    const engine = new Server(options)
+    engine.attach(server.attach(srv, options), options)
+    return engine
+}
+
+export = {
+    attach
+}
diff --git a/packages/websocket/src/engine.io/server.ts b/packages/websocket/src/engine.io/server.ts
new file mode 100644
index 00000000..d0dff54a
--- /dev/null
+++ b/packages/websocket/src/engine.io/server.ts
@@ -0,0 +1,690 @@
+const qs = require("querystring")
+const parse = require("url").parse
+// const base64id = require("base64id")
+import transports from './transports'
+import { EventEmitter } from 'events'
+// const EventEmitter = require("events").EventEmitter
+import { Socket } from './socket'
+// const debug = require("debug")("engine")
+const debug = function (...args) { }
+// const cookieMod = require("cookie")
+
+// const DEFAULT_WS_ENGINE = require("ws").Server;
+import { WebSocketServer } from '../server'
+import { Transport } from './transport'
+const DEFAULT_WS_ENGINE = WebSocketServer
+
+import { Request } from '../server/request'
+import { WebSocketClient } from '../server/client'
+
+export class Server extends EventEmitter {
+    public static errors = {
+        UNKNOWN_TRANSPORT: 0,
+        UNKNOWN_SID: 1,
+        BAD_HANDSHAKE_METHOD: 2,
+        BAD_REQUEST: 3,
+        FORBIDDEN: 4,
+        UNSUPPORTED_PROTOCOL_VERSION: 5
+    }
+
+    public static errorMessages = {
+        0: "Transport unknown",
+        1: "Session ID unknown",
+        2: "Bad handshake method",
+        3: "Bad request",
+        4: "Forbidden",
+        5: "Unsupported protocol version"
+    }
+
+    private clients = {}
+    private clientsCount = 0
+    public opts: any
+
+    private corsMiddleware: any
+
+    private ws: any
+    private perMessageDeflate: any
+
+    constructor(opts: any = {}) {
+        super()
+        this.opts = Object.assign(
+            {
+                wsEngine: DEFAULT_WS_ENGINE,
+                pingTimeout: 20000,
+                pingInterval: 25000,
+                upgradeTimeout: 10000,
+                maxHttpBufferSize: 1e6,
+                transports: Object.keys(transports),
+                allowUpgrades: true,
+                httpCompression: {
+                    threshold: 1024
+                },
+                cors: false,
+                allowEIO3: false
+            },
+            opts
+        )
+
+        // if (opts.cookie) {
+        //     this.opts.cookie = Object.assign(
+        //         {
+        //             name: "io",
+        //             path: "/",
+        //             httpOnly: opts.cookie.path !== false,
+        //             sameSite: "lax"
+        //         },
+        //         opts.cookie
+        //     )
+        // }
+
+        // if (this.opts.cors) {
+        //     this.corsMiddleware = require("cors")(this.opts.cors)
+        // }
+
+        // if (opts.perMessageDeflate) {
+        //     this.opts.perMessageDeflate = Object.assign(
+        //         {
+        //             threshold: 1024
+        //         },
+        //         opts.perMessageDeflate
+        //     )
+        // }
+
+        // this.init()
+    }
+
+    // /**
+    //  * Initialize websocket server
+    //  *
+    //  * @api private
+    //  */
+    // init() {
+    //     if (!~this.opts.transports.indexOf("websocket")) return
+
+    //     if (this.ws) this.ws.close()
+
+    //     this.ws = new this.opts.wsEngine({
+    //         noServer: true,
+    //         clientTracking: false,
+    //         perMessageDeflate: this.opts.perMessageDeflate,
+    //         maxPayload: this.opts.maxHttpBufferSize
+    //     })
+
+    //     if (typeof this.ws.on === "function") {
+    //         this.ws.on("headers", (headersArray, req) => {
+    //             // note: 'ws' uses an array of headers, while Engine.IO uses an object (response.writeHead() accepts both formats)
+    //             // we could also try to parse the array and then sync the values, but that will be error-prone
+    //             const additionalHeaders = {}
+
+    //             const isInitialRequest = !req._query.sid
+    //             if (isInitialRequest) {
+    //                 this.emit("initial_headers", additionalHeaders, req)
+    //             }
+
+    //             this.emit("headers", additionalHeaders, req)
+
+    //             Object.keys(additionalHeaders).forEach(key => {
+    //                 headersArray.push(`${key}: ${additionalHeaders[key]}`)
+    //             })
+    //         })
+    //     }
+    // }
+
+    /**
+     * Returns a list of available transports for upgrade given a certain transport.
+     *
+     * @return {Array}
+     * @api public
+     */
+    upgrades(transport): Array<any> {
+        if (!this.opts.allowUpgrades) return []
+        return transports[transport].upgradesTo || []
+    }
+
+    // /**
+    //  * Verifies a request.
+    //  *
+    //  * @param {http.IncomingMessage}
+    //  * @return {Boolean} whether the request is valid
+    //  * @api private
+    //  */
+    // verify(req, upgrade, fn) {
+    //     // transport check
+    //     const transport = req._query.transport
+    //     if (!~this.opts.transports.indexOf(transport)) {
+    //         debug('unknown transport "%s"', transport)
+    //         return fn(Server.errors.UNKNOWN_TRANSPORT, { transport })
+    //     }
+
+    //     // 'Origin' header check
+    //     const isOriginInvalid = checkInvalidHeaderChar(req.headers.origin)
+    //     if (isOriginInvalid) {
+    //         const origin = req.headers.origin
+    //         req.headers.origin = null
+    //         debug("origin header invalid")
+    //         return fn(Server.errors.BAD_REQUEST, {
+    //             name: "INVALID_ORIGIN",
+    //             origin
+    //         })
+    //     }
+
+    //     // sid check
+    //     const sid = req._query.sid
+    //     if (sid) {
+    //         if (!this.clients.hasOwnProperty(sid)) {
+    //             debug('unknown sid "%s"', sid)
+    //             return fn(Server.errors.UNKNOWN_SID, {
+    //                 sid
+    //             })
+    //         }
+    //         const previousTransport = this.clients[sid].transport.name
+    //         if (!upgrade && previousTransport !== transport) {
+    //             debug("bad request: unexpected transport without upgrade")
+    //             return fn(Server.errors.BAD_REQUEST, {
+    //                 name: "TRANSPORT_MISMATCH",
+    //                 transport,
+    //                 previousTransport
+    //             })
+    //         }
+    //     } else {
+    //         // handshake is GET only
+    //         if ("GET" !== req.method) {
+    //             return fn(Server.errors.BAD_HANDSHAKE_METHOD, {
+    //                 method: req.method
+    //             })
+    //         }
+
+    //         if (!this.opts.allowRequest) return fn()
+
+    //         return this.opts.allowRequest(req, (message, success) => {
+    //             if (!success) {
+    //                 return fn(Server.errors.FORBIDDEN, {
+    //                     message
+    //                 })
+    //             }
+    //             fn()
+    //         })
+    //     }
+
+    //     fn()
+    // }
+
+    /**
+     * Prepares a request by processing the query string.
+     *
+     * @api private
+     */
+    prepare(req) {
+        // try to leverage pre-existing `req._query` (e.g: from connect)
+        if (!req._query) {
+            req._query = ~req.url.indexOf("?") ? qs.parse(parse(req.url).query) : {}
+        }
+    }
+
+    /**
+     * Closes all clients.
+     *
+     * @api public
+     */
+    close() {
+        debug("closing all open clients")
+        for (let i in this.clients) {
+            if (this.clients.hasOwnProperty(i)) {
+                this.clients[i].close(true)
+            }
+        }
+        if (this.ws) {
+            debug("closing webSocketServer")
+            this.ws.close()
+            // don't delete this.ws because it can be used again if the http server starts listening again
+        }
+        return this
+    }
+
+    // /**
+    //  * Handles an Engine.IO HTTP request.
+    //  *
+    //  * @param {http.IncomingMessage} request
+    //  * @param {http.ServerResponse|http.OutgoingMessage} response
+    //  * @api public
+    //  */
+    // handleRequest(req, res) {
+    //     debug('handling "%s" http request "%s"', req.method, req.url)
+    //     this.prepare(req)
+    //     req.res = res
+
+    //     const callback = (errorCode, errorContext) => {
+    //         if (errorCode !== undefined) {
+    //             this.emit("connection_error", {
+    //                 req,
+    //                 code: errorCode,
+    //                 message: Server.errorMessages[errorCode],
+    //                 context: errorContext
+    //             })
+    //             abortRequest(res, errorCode, errorContext)
+    //             return
+    //         }
+
+    //         if (req._query.sid) {
+    //             debug("setting new request for existing client")
+    //             this.clients[req._query.sid].transport.onRequest(req)
+    //         } else {
+    //             const closeConnection = (errorCode, errorContext) =>
+    //                 abortRequest(res, errorCode, errorContext)
+    //             this.handshake(req._query.transport, req, closeConnection)
+    //         }
+    //     }
+
+    //     if (this.corsMiddleware) {
+    //         this.corsMiddleware.call(null, req, res, () => {
+    //             this.verify(req, false, callback)
+    //         })
+    //     } else {
+    //         this.verify(req, false, callback)
+    //     }
+    // }
+
+    /**
+     * generate a socket id.
+     * Overwrite this method to generate your custom socket id
+     *
+     * @param {Object} request object
+     * @api public
+     */
+    generateId(req) {
+        return req.id
+    }
+
+    /**
+     * Handshakes a new client.
+     *
+     * @param {String} transport name
+     * @param {Object} request object
+     * @param {Function} closeConnection
+     *
+     * @api private
+     */
+    // @java-patch sync handshake
+    handshake(transportName, req, closeConnection: (code: number) => void) {
+        console.debug('engine.io server handshake transport', transportName, 'from', req.url)
+        const protocol = req._query.EIO === "4" ? 4 : 3 // 3rd revision by default
+        if (protocol === 3 && !this.opts.allowEIO3) {
+            debug("unsupported protocol version")
+            this.emit("connection_error", {
+                req,
+                code: Server.errors.UNSUPPORTED_PROTOCOL_VERSION,
+                message:
+                    Server.errorMessages[Server.errors.UNSUPPORTED_PROTOCOL_VERSION],
+                context: {
+                    protocol
+                }
+            })
+            closeConnection(Server.errors.UNSUPPORTED_PROTOCOL_VERSION)
+            return
+        }
+
+        let id
+        try {
+            id = this.generateId(req)
+        } catch (e) {
+            console.debug("error while generating an id")
+            this.emit("connection_error", {
+                req,
+                code: Server.errors.BAD_REQUEST,
+                message: Server.errorMessages[Server.errors.BAD_REQUEST],
+                context: {
+                    name: "ID_GENERATION_ERROR",
+                    error: e
+                }
+            })
+            closeConnection(Server.errors.BAD_REQUEST)
+            return
+        }
+
+        console.debug('engine.io server handshaking client "' + id + '"')
+
+        try {
+            var transport: Transport = new transports[transportName](req)
+            if ("websocket" !== transportName) {
+                throw new Error('Unsupport polling at MiaoScript!')
+            }
+            // if ("polling" === transportName) {
+            //     transport.maxHttpBufferSize = this.opts.maxHttpBufferSize
+            //     transport.httpCompression = this.opts.httpCompression
+            // } else if ("websocket" === transportName) {
+            transport.perMessageDeflate = this.opts.perMessageDeflate
+            // }
+
+            if (req._query && req._query.b64) {
+                transport.supportsBinary = false
+            } else {
+                transport.supportsBinary = true
+            }
+        } catch (e) {
+            console.ex(e)
+            this.emit("connection_error", {
+                req,
+                code: Server.errors.BAD_REQUEST,
+                message: Server.errorMessages[Server.errors.BAD_REQUEST],
+                context: {
+                    name: "TRANSPORT_HANDSHAKE_ERROR",
+                    error: e
+                }
+            })
+            closeConnection(Server.errors.BAD_REQUEST)
+            return
+        }
+        console.debug(`engine.io server create socket ${id} from transport ${transport.name} protocol ${protocol}`)
+        const socket = new Socket(id, this, transport, req, protocol)
+
+        transport.on("headers", (headers, req) => {
+            const isInitialRequest = !req._query.sid
+
+            if (isInitialRequest) {
+                if (this.opts.cookie) {
+                    headers["Set-Cookie"] = [
+                        // cookieMod.serialize(this.opts.cookie.name, id, this.opts.cookie)
+                    ]
+                }
+                this.emit("initial_headers", headers, req)
+            }
+            this.emit("headers", headers, req)
+        })
+
+        transport.onRequest(req)
+
+        this.clients[id] = socket
+        this.clientsCount++
+
+        socket.once("close", () => {
+            delete this.clients[id]
+            this.clientsCount--
+        })
+        this.emit("connection", socket)
+    }
+
+    // /**
+    //  * Handles an Engine.IO HTTP Upgrade.
+    //  *
+    //  * @api public
+    //  */
+    // handleUpgrade(req, socket, upgradeHead) {
+    //     this.prepare(req)
+
+    //     this.verify(req, true, (errorCode, errorContext) => {
+    //         if (errorCode) {
+    //             this.emit("connection_error", {
+    //                 req,
+    //                 code: errorCode,
+    //                 message: Server.errorMessages[errorCode],
+    //                 context: errorContext
+    //             })
+    //             abortUpgrade(socket, errorCode, errorContext)
+    //             return
+    //         }
+
+    //         const head = Buffer.from(upgradeHead) // eslint-disable-line node/no-deprecated-api
+    //         upgradeHead = null
+
+    //         // delegate to ws
+    //         this.ws.handleUpgrade(req, socket, head, websocket => {
+    //             this.onWebSocket(req, socket, websocket)
+    //         })
+    //     })
+    // }
+
+    /**
+     * Called upon a ws.io connection.
+     *
+     * @param {ws.Socket} websocket
+     * @api private
+     */
+    onWebSocket(req: Request, socket, websocket: WebSocketClient) {
+        websocket.on("error", onUpgradeError)
+
+        if (
+            transports[req._query.transport] !== undefined &&
+            !transports[req._query.transport].prototype.handlesUpgrades
+        ) {
+            console.debug("transport doesnt handle upgraded requests")
+            websocket.close()
+            return
+        }
+
+        // get client id
+        const id = req._query.sid
+
+        // keep a reference to the ws.Socket
+        req.websocket = websocket
+
+        if (id) {
+            const client = this.clients[id]
+            if (!client) {
+                console.debug("upgrade attempt for closed client")
+                websocket.close()
+            } else if (client.upgrading) {
+                console.debug("transport has already been trying to upgrade")
+                websocket.close()
+            } else if (client.upgraded) {
+                console.debug("transport had already been upgraded")
+                websocket.close()
+            } else {
+                console.debug("upgrading existing transport")
+
+                // transport error handling takes over
+                websocket.removeListener("error", onUpgradeError)
+
+                const transport = new transports[req._query.transport](req)
+                if (req._query && req._query.b64) {
+                    transport.supportsBinary = false
+                } else {
+                    transport.supportsBinary = true
+                }
+                transport.perMessageDeflate = this.perMessageDeflate
+                client.maybeUpgrade(transport)
+            }
+        } else {
+            // transport error handling takes over
+            websocket.removeListener("error", onUpgradeError)
+
+            // const closeConnection = (errorCode, errorContext) =>
+            //     abortUpgrade(socket, errorCode, errorContext)
+            this.handshake(req._query.transport, req, () => { })
+        }
+
+        function onUpgradeError() {
+            console.debug("websocket error before upgrade")
+            // websocket.close() not needed
+        }
+    }
+
+    /**
+     * Captures upgrade requests for a http.Server.
+     *
+     * @param {http.Server} server
+     * @param {Object} options
+     * @api public
+     */
+    attach(server, options: any = {}) {
+        // let path = (options.path || "/engine.io").replace(/\/$/, "")
+
+        // const destroyUpgradeTimeout = options.destroyUpgradeTimeout || 1000
+
+        // // normalize path
+        // path += "/"
+
+        // function check(req) {
+        //     return path === req.url.substr(0, path.length)
+        // }
+
+        // cache and clean up listeners
+        // const listeners = server.listeners("request").slice(0)
+        // server.removeAllListeners("request")
+        server.on("close", this.close.bind(this))
+        // server.on("listening", this.init.bind(this))
+        // @java-patch transfer to Netty Server
+        server.on("connect", (request: Request, websocket: WebSocketClient) => {
+            console.debug('Engine.IO connect client from', request.url)
+            this.prepare(request)
+            this.onWebSocket(request, undefined, websocket)
+        })
+        // set server as ws server
+        this.ws = server
+
+        // // add request handler
+        // server.on("request", (req, res) => {
+        //     if (check(req)) {
+        //         debug('intercepting request for path "%s"', path)
+        //         this.handleRequest(req, res)
+        //     } else {
+        //         let i = 0
+        //         const l = listeners.length
+        //         for (; i < l; i++) {
+        //             listeners[i].call(server, req, res)
+        //         }
+        //     }
+        // })
+
+        // if (~this.opts.transports.indexOf("websocket")) {
+        //     server.on("upgrade", (req, socket, head) => {
+        //         if (check(req)) {
+        //             this.handleUpgrade(req, socket, head)
+        //         } else if (false !== options.destroyUpgrade) {
+        //             // default node behavior is to disconnect when no handlers
+        //             // but by adding a handler, we prevent that
+        //             // and if no eio thing handles the upgrade
+        //             // then the socket needs to die!
+        //             setTimeout(function () {
+        //                 if (socket.writable && socket.bytesWritten <= 0) {
+        //                     return socket.end()
+        //                 }
+        //             }, destroyUpgradeTimeout)
+        //         }
+        //     })
+        // }
+    }
+}
+
+// /**
+//  * Close the HTTP long-polling request
+//  *
+//  * @param res - the response object
+//  * @param errorCode - the error code
+//  * @param errorContext - additional error context
+//  *
+//  * @api private
+//  */
+
+// function abortRequest(res, errorCode, errorContext) {
+//     const statusCode = errorCode === Server.errors.FORBIDDEN ? 403 : 400
+//     const message =
+//         errorContext && errorContext.message
+//             ? errorContext.message
+//             : Server.errorMessages[errorCode]
+
+//     res.writeHead(statusCode, { "Content-Type": "application/json" })
+//     res.end(
+//         JSON.stringify({
+//             code: errorCode,
+//             message
+//         })
+//     )
+// }
+
+// /**
+//  * Close the WebSocket connection
+//  *
+//  * @param {net.Socket} socket
+//  * @param {string} errorCode - the error code
+//  * @param {object} errorContext - additional error context
+//  *
+//  * @api private
+//  */
+
+// function abortUpgrade(socket, errorCode, errorContext: any = {}) {
+//     socket.on("error", () => {
+//         debug("ignoring error from closed connection")
+//     })
+//     if (socket.writable) {
+//         const message = errorContext.message || Server.errorMessages[errorCode]
+//         const length = Buffer.byteLength(message)
+//         socket.write(
+//             "HTTP/1.1 400 Bad Request\r\n" +
+//             "Connection: close\r\n" +
+//             "Content-type: text/html\r\n" +
+//             "Content-Length: " +
+//             length +
+//             "\r\n" +
+//             "\r\n" +
+//             message
+//         )
+//     }
+//     socket.destroy()
+// }
+
+// module.exports = Server
+
+/* eslint-disable */
+
+// /**
+//  * From https://github.com/nodejs/node/blob/v8.4.0/lib/_http_common.js#L303-L354
+//  *
+//  * True if val contains an invalid field-vchar
+//  *  field-value    = *( field-content / obs-fold )
+//  *  field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
+//  *  field-vchar    = VCHAR / obs-text
+//  *
+//  * checkInvalidHeaderChar() is currently designed to be inlinable by v8,
+//  * so take care when making changes to the implementation so that the source
+//  * code size does not exceed v8's default max_inlined_source_size setting.
+//  **/
+// // prettier-ignore
+// const validHdrChars = [
+//     0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, // 0 - 15
+//     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 32 - 47
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 48 - 63
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64 - 79
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 80 - 95
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 96 - 111
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, // 112 - 127
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 128 ...
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+//     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1  // ... 255
+// ]
+
+// function checkInvalidHeaderChar(val) {
+//     val += ""
+//     if (val.length < 1) return false
+//     if (!validHdrChars[val.charCodeAt(0)]) {
+//         debug('invalid header, index 0, char "%s"', val.charCodeAt(0))
+//         return true
+//     }
+//     if (val.length < 2) return false
+//     if (!validHdrChars[val.charCodeAt(1)]) {
+//         debug('invalid header, index 1, char "%s"', val.charCodeAt(1))
+//         return true
+//     }
+//     if (val.length < 3) return false
+//     if (!validHdrChars[val.charCodeAt(2)]) {
+//         debug('invalid header, index 2, char "%s"', val.charCodeAt(2))
+//         return true
+//     }
+//     if (val.length < 4) return false
+//     if (!validHdrChars[val.charCodeAt(3)]) {
+//         debug('invalid header, index 3, char "%s"', val.charCodeAt(3))
+//         return true
+//     }
+//     for (let i = 4; i < val.length; ++i) {
+//         if (!validHdrChars[val.charCodeAt(i)]) {
+//             debug('invalid header, index "%i", char "%s"', i, val.charCodeAt(i))
+//             return true
+//         }
+//     }
+//     return false
+// }
diff --git a/packages/websocket/src/engine.io/socket.ts b/packages/websocket/src/engine.io/socket.ts
new file mode 100644
index 00000000..413e75c8
--- /dev/null
+++ b/packages/websocket/src/engine.io/socket.ts
@@ -0,0 +1,530 @@
+import { EventEmitter } from "events"
+import { Server } from "./server"
+import { Transport } from "./transport"
+import type { Request } from "../server/request"
+// const debug = require("debug")("engine:socket")
+
+export class Socket extends EventEmitter {
+    public id: string
+    private server: Server
+    private upgrading = false
+    private upgraded = false
+    public readyState = "opening"
+    private writeBuffer = []
+    private packetsFn = []
+    private sentCallbackFn = []
+    private cleanupFn = []
+    public request: Request
+    public protocol: number
+    public remoteAddress: any
+    public transport: Transport
+
+    private checkIntervalTimer: NodeJS.Timeout
+    private upgradeTimeoutTimer: NodeJS.Timeout
+    private pingTimeoutTimer: NodeJS.Timeout
+    private pingIntervalTimer: NodeJS.Timeout
+
+    /**
+     * Client class (abstract).
+     *
+     * @api private
+     */
+    constructor(id: string, server: Server, transport: Transport, req: Request, protocol: number) {
+        super()
+        this.id = id
+        this.server = server
+        this.request = req
+        this.protocol = protocol
+
+        // Cache IP since it might not be in the req later
+        if (req.websocket && req.websocket._socket) {
+            this.remoteAddress = req.websocket._socket.remoteAddress
+        } else {
+            this.remoteAddress = req.connection.remoteAddress
+        }
+
+        this.checkIntervalTimer = null
+        this.upgradeTimeoutTimer = null
+        this.pingTimeoutTimer = null
+        this.pingIntervalTimer = null
+
+        this.setTransport(transport)
+        this.onOpen()
+    }
+
+    /**
+     * Called upon transport considered open.
+     *
+     * @api private
+     */
+    onOpen() {
+        this.readyState = "open"
+
+        // sends an `open` packet
+        this.transport.sid = this.id
+        this.sendPacket(
+            "open",
+            JSON.stringify({
+                sid: this.id,
+                upgrades: this.getAvailableUpgrades(),
+                pingInterval: this.server.opts.pingInterval,
+                pingTimeout: this.server.opts.pingTimeout
+            })
+        )
+
+        if (this.server.opts.initialPacket) {
+            this.sendPacket("message", this.server.opts.initialPacket)
+        }
+
+        this.emit("open")
+
+        if (this.protocol === 3) {
+            // in protocol v3, the client sends a ping, and the server answers with a pong
+            this.resetPingTimeout(
+                this.server.opts.pingInterval + this.server.opts.pingTimeout
+            )
+        } else {
+            // in protocol v4, the server sends a ping, and the client answers with a pong
+            this.schedulePing()
+        }
+    }
+
+    /**
+     * Called upon transport packet.
+     *
+     * @param {Object} packet
+     * @api private
+     */
+    onPacket(packet: { type: any; data: any }) {
+        if ("open" !== this.readyState) {
+            console.debug("packet received with closed socket")
+            return
+        }
+        // export packet event
+        // debug(`received packet ${packet.type}`)
+        this.emit("packet", packet)
+
+        // Reset ping timeout on any packet, incoming data is a good sign of
+        // other side's liveness
+        this.resetPingTimeout(
+            this.server.opts.pingInterval + this.server.opts.pingTimeout
+        )
+
+        switch (packet.type) {
+            case "ping":
+                if (this.transport.protocol !== 3) {
+                    this.onError("invalid heartbeat direction")
+                    return
+                }
+                // debug("got ping")
+                this.sendPacket("pong")
+                this.emit("heartbeat")
+                break
+
+            case "pong":
+                if (this.transport.protocol === 3) {
+                    this.onError("invalid heartbeat direction")
+                    return
+                }
+                // debug("got pong")
+                this.schedulePing()
+                this.emit("heartbeat")
+                break
+
+            case "error":
+                this.onClose("parse error")
+                break
+
+            case "message":
+                this.emit("data", packet.data)
+                this.emit("message", packet.data)
+                break
+        }
+    }
+
+    /**
+     * Called upon transport error.
+     *
+     * @param {Error} error object
+     * @api private
+     */
+    onError(err: string) {
+        // debug("transport error")
+        this.onClose("transport error", err)
+    }
+
+    /**
+     * Pings client every `this.pingInterval` and expects response
+     * within `this.pingTimeout` or closes connection.
+     *
+     * @api private
+     */
+    schedulePing() {
+        clearTimeout(this.pingIntervalTimer)
+        this.pingIntervalTimer = setTimeout(() => {
+            // debug(
+            //     "writing ping packet - expecting pong within %sms",
+            //     this.server.opts.pingTimeout
+            // )
+            this.sendPacket("ping")
+            this.resetPingTimeout(this.server.opts.pingTimeout)
+        }, this.server.opts.pingInterval)
+    }
+
+    /**
+     * Resets ping timeout.
+     *
+     * @api private
+     */
+    resetPingTimeout(timeout: number) {
+        clearTimeout(this.pingTimeoutTimer)
+        this.pingTimeoutTimer = setTimeout(() => {
+            if (this.readyState === "closed") return
+            this.onClose("ping timeout")
+        }, timeout)
+    }
+
+    /**
+     * Attaches handlers for the given transport.
+     *
+     * @param {Transport} transport
+     * @api private
+     */
+    setTransport(transport: Transport) {
+        console.debug(`engine.io socket ${this.id} set transport ${transport.name}`)
+        const onError = this.onError.bind(this)
+        const onPacket = this.onPacket.bind(this)
+        const flush = this.flush.bind(this)
+        const onClose = this.onClose.bind(this, "transport close")
+
+        this.transport = transport
+        this.transport.once("error", onError)
+        this.transport.on("packet", onPacket)
+        this.transport.on("drain", flush)
+        this.transport.once("close", onClose)
+        // this function will manage packet events (also message callbacks)
+        this.setupSendCallback()
+
+        this.cleanupFn.push(function () {
+            transport.removeListener("error", onError)
+            transport.removeListener("packet", onPacket)
+            transport.removeListener("drain", flush)
+            transport.removeListener("close", onClose)
+        })
+    }
+
+    /**
+     * Upgrades socket to the given transport
+     *
+     * @param {Transport} transport
+     * @api private
+     */
+    maybeUpgrade(transport: Transport) {
+        console.debug(
+            'might upgrade socket transport from "', this.transport.name, '" to "', transport.name, '"'
+        )
+
+        this.upgrading = true
+
+        // set transport upgrade timer
+        this.upgradeTimeoutTimer = setTimeout(() => {
+            console.debug("client did not complete upgrade - closing transport")
+            cleanup()
+            if ("open" === transport.readyState) {
+                transport.close()
+            }
+        }, this.server.opts.upgradeTimeout)
+
+        const onPacket = (packet: { type: string; data: string }) => {
+            if ("ping" === packet.type && "probe" === packet.data) {
+                transport.send([{ type: "pong", data: "probe" }])
+                this.emit("upgrading", transport)
+                clearInterval(this.checkIntervalTimer)
+                this.checkIntervalTimer = setInterval(check, 100)
+            } else if ("upgrade" === packet.type && this.readyState !== "closed") {
+                // debug("got upgrade packet - upgrading")
+                cleanup()
+                this.transport.discard()
+                this.upgraded = true
+                this.clearTransport()
+                this.setTransport(transport)
+                this.emit("upgrade", transport)
+                this.flush()
+                if (this.readyState === "closing") {
+                    transport.close(() => {
+                        this.onClose("forced close")
+                    })
+                }
+            } else {
+                cleanup()
+                transport.close()
+            }
+        }
+
+        // we force a polling cycle to ensure a fast upgrade
+        const check = () => {
+            if ("polling" === this.transport.name && this.transport.writable) {
+                // debug("writing a noop packet to polling for fast upgrade")
+                this.transport.send([{ type: "noop" }])
+            }
+        }
+
+        const cleanup = () => {
+            this.upgrading = false
+
+            clearInterval(this.checkIntervalTimer)
+            this.checkIntervalTimer = null
+
+            clearTimeout(this.upgradeTimeoutTimer)
+            this.upgradeTimeoutTimer = null
+
+            transport.removeListener("packet", onPacket)
+            transport.removeListener("close", onTransportClose)
+            transport.removeListener("error", onError)
+            this.removeListener("close", onClose)
+        }
+
+        const onError = (err: string) => {
+            // debug("client did not complete upgrade - %s", err)
+            cleanup()
+            transport.close()
+            transport = null
+        }
+
+        const onTransportClose = () => {
+            onError("transport closed")
+        }
+
+        const onClose = () => {
+            onError("socket closed")
+        }
+
+        transport.on("packet", onPacket)
+        transport.once("close", onTransportClose)
+        transport.once("error", onError)
+
+        this.once("close", onClose)
+    }
+
+    /**
+     * Clears listeners and timers associated with current transport.
+     *
+     * @api private
+     */
+    clearTransport() {
+        let cleanup: () => void
+
+        const toCleanUp = this.cleanupFn.length
+
+        for (let i = 0; i < toCleanUp; i++) {
+            cleanup = this.cleanupFn.shift()
+            cleanup()
+        }
+
+        // silence further transport errors and prevent uncaught exceptions
+        this.transport.on("error", function () {
+            // debug("error triggered by discarded transport")
+        })
+
+        // ensure transport won't stay open
+        this.transport.close()
+
+        clearTimeout(this.pingTimeoutTimer)
+    }
+
+    /**
+     * Called upon transport considered closed.
+     * Possible reasons: `ping timeout`, `client error`, `parse error`,
+     * `transport error`, `server close`, `transport close`
+     */
+    onClose(reason: string, description?: string) {
+        if ("closed" !== this.readyState) {
+            this.readyState = "closed"
+
+            // clear timers
+            clearTimeout(this.pingIntervalTimer)
+            clearTimeout(this.pingTimeoutTimer)
+
+            clearInterval(this.checkIntervalTimer)
+            this.checkIntervalTimer = null
+            clearTimeout(this.upgradeTimeoutTimer)
+            // clean writeBuffer in next tick, so developers can still
+            // grab the writeBuffer on 'close' event
+            process.nextTick(() => {
+                this.writeBuffer = []
+            })
+            this.packetsFn = []
+            this.sentCallbackFn = []
+            this.clearTransport()
+            this.emit("close", reason, description)
+        }
+    }
+
+    /**
+     * Setup and manage send callback
+     *
+     * @api private
+     */
+    setupSendCallback() {
+        // the message was sent successfully, execute the callback
+        const onDrain = () => {
+            if (this.sentCallbackFn.length > 0) {
+                const seqFn = this.sentCallbackFn.splice(0, 1)[0]
+                if ("function" === typeof seqFn) {
+                    // debug("executing send callback")
+                    seqFn(this.transport)
+                } else if (Array.isArray(seqFn)) {
+                    // debug("executing batch send callback")
+                    const l = seqFn.length
+                    let i = 0
+                    for (; i < l; i++) {
+                        if ("function" === typeof seqFn[i]) {
+                            seqFn[i](this.transport)
+                        }
+                    }
+                }
+            }
+        }
+
+        this.transport.on("drain", onDrain)
+
+        this.cleanupFn.push(() => {
+            this.transport.removeListener("drain", onDrain)
+        })
+    }
+
+    /**
+     * Sends a message packet.
+     *
+     * @param {String} message
+     * @param {Object} options
+     * @param {Function} callback
+     * @return {Socket} for chaining
+     * @api public
+     */
+    send(data: any, options: any, callback: any) {
+        this.sendPacket("message", data, options, callback)
+        return this
+    }
+
+    write(data: any, options: any, callback?: any) {
+        this.sendPacket("message", data, options, callback)
+        return this
+    }
+
+    /**
+     * Sends a packet.
+     *
+     * @param {String} packet type
+     * @param {String} optional, data
+     * @param {Object} options
+     * @api private
+     */
+    sendPacket(type: string, data?: string, options?: { compress?: any }, callback?: undefined) {
+        if ("function" === typeof options) {
+            callback = options
+            options = null
+        }
+
+        options = options || {}
+        options.compress = false !== options.compress
+
+        if ("closing" !== this.readyState && "closed" !== this.readyState) {
+            // console.debug('sending packet "%s" (%s)', type, data)
+
+            const packet: any = {
+                type: type,
+                options: options
+            }
+            if (data) packet.data = data
+
+            // exports packetCreate event
+            this.emit("packetCreate", packet)
+
+            this.writeBuffer.push(packet)
+
+            // add send callback to object, if defined
+            if (callback) this.packetsFn.push(callback)
+
+            this.flush()
+        }
+    }
+
+    /**
+     * Attempts to flush the packets buffer.
+     *
+     * @api private
+     */
+    flush() {
+        if (
+            "closed" !== this.readyState &&
+            this.transport.writable &&
+            this.writeBuffer.length
+        ) {
+            console.trace("flushing buffer to transport")
+            this.emit("flush", this.writeBuffer)
+            this.server.emit("flush", this, this.writeBuffer)
+            const wbuf = this.writeBuffer
+            this.writeBuffer = []
+            if (!this.transport.supportsFraming) {
+                this.sentCallbackFn.push(this.packetsFn)
+            } else {
+                this.sentCallbackFn.push.apply(this.sentCallbackFn, this.packetsFn)
+            }
+            this.packetsFn = []
+            this.transport.send(wbuf)
+            this.emit("drain")
+            this.server.emit("drain", this)
+        }
+    }
+
+    /**
+     * Get available upgrades for this socket.
+     *
+     * @api private
+     */
+    getAvailableUpgrades() {
+        const availableUpgrades = []
+        const allUpgrades = this.server.upgrades(this.transport.name)
+        let i = 0
+        const l = allUpgrades.length
+        for (; i < l; ++i) {
+            const upg = allUpgrades[i]
+            if (this.server.opts.transports.indexOf(upg) !== -1) {
+                availableUpgrades.push(upg)
+            }
+        }
+        return availableUpgrades
+    }
+
+    /**
+     * Closes the socket and underlying transport.
+     *
+     * @param {Boolean} optional, discard
+     * @return {Socket} for chaining
+     * @api public
+     */
+    close(discard?: any) {
+        if ("open" !== this.readyState) return
+
+        this.readyState = "closing"
+
+        if (this.writeBuffer.length) {
+            this.once("drain", this.closeTransport.bind(this, discard))
+            return
+        }
+
+        this.closeTransport(discard)
+    }
+
+    /**
+     * Closes the underlying transport.
+     *
+     * @param {Boolean} discard
+     * @api private
+     */
+    closeTransport(discard: any) {
+        if (discard) this.transport.discard()
+        this.transport.close(this.onClose.bind(this, "forced close"))
+    }
+}
diff --git a/packages/websocket/src/engine.io/transport.ts b/packages/websocket/src/engine.io/transport.ts
new file mode 100644
index 00000000..d6367b90
--- /dev/null
+++ b/packages/websocket/src/engine.io/transport.ts
@@ -0,0 +1,121 @@
+import { EventEmitter } from 'events'
+import parser_v4 from "../engine.io-parser"
+import type { WebSocketClient } from '../server/client'
+/**
+ * Noop function.
+ *
+ * @api private
+ */
+
+function noop() { }
+
+export abstract class Transport extends EventEmitter {
+    public sid: string
+    public req /**http.IncomingMessage */
+    public socket: WebSocketClient
+    public writable: boolean
+    public readyState: string
+    public discarded: boolean
+    public protocol: Number
+    public parser: any
+    public perMessageDeflate: any
+    public supportsBinary: boolean = false
+
+    /**
+     * Transport constructor.
+     *
+     * @param {http.IncomingMessage} request
+     * @api public
+     */
+    constructor(req) {
+        super()
+        this.readyState = "open"
+        this.discarded = false
+        this.protocol = req._query.EIO === "4" ? 4 : 3 // 3rd revision by default
+        this.parser = parser_v4//= this.protocol === 4 ? parser_v4 : parser_v3
+    }
+
+    /**
+     * Flags the transport as discarded.
+     *
+     * @api private
+     */
+    discard() {
+        this.discarded = true
+    }
+
+    /**
+     * Called with an incoming HTTP request.
+     *
+     * @param {http.IncomingMessage} request
+     * @api private
+     */
+    onRequest(req) {
+        console.debug(`engine.io transport ${this.socket.id} setting request`, JSON.stringify(req))
+        this.req = req
+    }
+
+    /**
+     * Closes the transport.
+     *
+     * @api private
+     */
+    close(fn?) {
+        if ("closed" === this.readyState || "closing" === this.readyState) return
+
+        this.readyState = "closing"
+        this.doClose(fn || noop)
+    }
+
+    /**
+     * Called with a transport error.
+     *
+     * @param {String} message error
+     * @param {Object} error description
+     * @api private
+     */
+    onError(msg: string, desc?: string) {
+        if (this.listeners("error").length) {
+            const err: any = new Error(msg)
+            err.type = "TransportError"
+            err.description = desc
+            this.emit("error", err)
+        } else {
+            console.debug(`ignored transport error ${msg} (${desc})`)
+        }
+    }
+
+    /**
+     * Called with parsed out a packets from the data stream.
+     *
+     * @param {Object} packet
+     * @api private
+     */
+    onPacket(packet) {
+        this.emit("packet", packet)
+    }
+
+    /**
+     * Called with the encoded packet data.
+     *
+     * @param {String} data
+     * @api private
+     */
+    onData(data) {
+        this.onPacket(this.parser.decodePacket(data))
+    }
+
+    /**
+     * Called upon transport close.
+     *
+     * @api private
+     */
+    onClose() {
+        this.readyState = "closed"
+        this.emit("close")
+    }
+    abstract get supportsFraming()
+    abstract get name()
+    abstract send(...args: any[])
+    abstract doClose(d: Function)
+}
diff --git a/packages/websocket/src/engine.io/transports/index.ts b/packages/websocket/src/engine.io/transports/index.ts
new file mode 100644
index 00000000..1834ad2a
--- /dev/null
+++ b/packages/websocket/src/engine.io/transports/index.ts
@@ -0,0 +1,3 @@
+export default {
+    websocket: require("./websocket").WebSocket
+}
diff --git a/packages/websocket/src/engine.io/transports/websocket.ts b/packages/websocket/src/engine.io/transports/websocket.ts
new file mode 100644
index 00000000..933ed79e
--- /dev/null
+++ b/packages/websocket/src/engine.io/transports/websocket.ts
@@ -0,0 +1,116 @@
+import { Transport } from '../transport'
+// const debug = require("debug")("engine:ws")
+
+export class WebSocket extends Transport {
+    public perMessageDeflate: any
+
+    /**
+     * WebSocket transport
+     *
+     * @param {http.IncomingMessage}
+     * @api public
+     */
+    constructor(req) {
+        super(req)
+        this.socket = req.websocket
+        this.socket.on("message", this.onData.bind(this))
+        this.socket.once("close", this.onClose.bind(this))
+        this.socket.on("error", this.onError.bind(this))
+        this.writable = true
+        this.perMessageDeflate = null
+    }
+
+    /**
+     * Transport name
+     *
+     * @api public
+     */
+    get name() {
+        return "websocket"
+    }
+
+    /**
+     * Advertise upgrade support.
+     *
+     * @api public
+     */
+    get handlesUpgrades() {
+        return true
+    }
+
+    /**
+     * Advertise framing support.
+     *
+     * @api public
+     */
+    get supportsFraming() {
+        return true
+    }
+
+    /**
+     * Processes the incoming data.
+     *
+     * @param {String} encoded packet
+     * @api private
+     */
+    onData(data) {
+        // debug('received "%s"', data)
+        super.onData(data)
+    }
+
+    /**
+     * Writes a packet payload.
+     *
+     * @param {Array} packets
+     * @api private
+     */
+    send(packets) {
+        // console.log('WebSocket send packets', JSON.stringify(packets))
+        const packet = packets.shift()
+        if (typeof packet === "undefined") {
+            this.writable = true
+            this.emit("drain")
+            return
+        }
+
+        // always creates a new object since ws modifies it
+        const opts: any = {}
+        if (packet.options) {
+            opts.compress = packet.options.compress
+        }
+
+        const send = data => {
+            if (this.perMessageDeflate) {
+                const len =
+                    "string" === typeof data ? Buffer.byteLength(data) : data.length
+                if (len < this.perMessageDeflate.threshold) {
+                    opts.compress = false
+                }
+            }
+            console.trace('writing', data)
+            this.writable = false
+
+            this.socket.send(data, opts, err => {
+                if (err) return this.onError("write error", err.stack)
+                this.send(packets)
+            })
+        }
+
+        if (packet.options && typeof packet.options.wsPreEncoded === "string") {
+            send(packet.options.wsPreEncoded)
+        } else {
+            this.parser.encodePacket(packet, this.supportsBinary, send)
+        }
+    }
+
+    /**
+     * Closes the transport.
+     *
+     * @api private
+     */
+    doClose(fn) {
+        // debug("closing")
+        this.socket.close()
+        fn && fn()
+    }
+}
diff --git a/packages/websocket/src/index.ts b/packages/websocket/src/index.ts
index 831fec2d..68be7294 100644
--- a/packages/websocket/src/index.ts
+++ b/packages/websocket/src/index.ts
@@ -1,7 +1,7 @@
 /// <reference types="@ccms/nashorn" />
 /// <reference types="@javatypes/tomcat-websocket-api" />
 
-import { Server, ServerOptions } from './socket-io'
+import { Server, ServerOptions } from './socket.io'
 
 interface SocketIOStatic {
     /**
@@ -44,7 +44,7 @@ let io: SocketStatic = function (pipeline: any, options: Partial<ServerOptions>)
 }
 io.Instance = Symbol("@ccms/websocket")
 export default io
-export * from './socket-io'
+export * from './socket.io'
 export * from './client'
 export * from './server'
-export * from './transport'
+export * from './engine.io/transport'
diff --git a/packages/websocket/src/netty/client.ts b/packages/websocket/src/netty/client.ts
index 616adb9e..be267ccc 100644
--- a/packages/websocket/src/netty/client.ts
+++ b/packages/websocket/src/netty/client.ts
@@ -1,24 +1,26 @@
-import { Transport } from '../transport'
-import { AttributeKeys } from './constants'
+import { WebSocketClient } from '../server/client'
 
 const TextWebSocketFrame = Java.type('io.netty.handler.codec.http.websocketx.TextWebSocketFrame')
 
-export class NettyClient extends Transport {
+export class NettyClient extends WebSocketClient {
     private channel: any
 
-    constructor(server: any, channel: any) {
-        super(server)
-        this.remoteAddress = channel.remoteAddress() + ''
-        this.request = channel.attr(AttributeKeys.Request).get()
-
-        this._id = channel.id() + ''
+    constructor(channel: any) {
+        super()
+        this.id = channel.id() + ''
         this.channel = channel
     }
 
-    doSend(text: string) {
-        this.channel.writeAndFlush(new TextWebSocketFrame(text))
+    send(text: string, opts?: any, callback?: (err?: Error) => void) {
+        try {
+            this.channel.writeAndFlush(new TextWebSocketFrame(text))
+            callback?.()
+        } catch (error) {
+            callback?.(error)
+        }
     }
-    doClose() {
+
+    close() {
         this.channel.close()
     }
 }
diff --git a/packages/websocket/src/netty/httprequest.ts b/packages/websocket/src/netty/httprequest.ts
index 89fc9a26..d7eb07f4 100644
--- a/packages/websocket/src/netty/httprequest.ts
+++ b/packages/websocket/src/netty/httprequest.ts
@@ -1,6 +1,7 @@
+import { JavaServerOptions } from '../server'
+
 import { HttpRequestHandlerAdapter } from './adapter'
 import { AttributeKeys } from './constants'
-import { ServerOptions } from 'socket-io'
 
 const DefaultHttpResponse = Java.type('io.netty.handler.codec.http.DefaultHttpResponse')
 const DefaultFullHttpResponse = Java.type('io.netty.handler.codec.http.DefaultFullHttpResponse')
@@ -18,7 +19,7 @@ const ChannelFutureListener = Java.type('io.netty.channel.ChannelFutureListener'
 export class HttpRequestHandler extends HttpRequestHandlerAdapter {
     private ws: string
     private root: string
-    constructor(options: ServerOptions) {
+    constructor(options: JavaServerOptions) {
         super()
         this.root = options.root
         this.ws = options.path
diff --git a/packages/websocket/src/netty/index.ts b/packages/websocket/src/netty/index.ts
index 1432e5d7..86bb4336 100644
--- a/packages/websocket/src/netty/index.ts
+++ b/packages/websocket/src/netty/index.ts
@@ -1,65 +1,70 @@
-import { EventEmitter } from 'events'
-
-import { ServerOptions } from '../socket-io'
-import { ServerEvent } from '../socket-io/constants'
+import { JavaServerOptions, ServerEvent, WebSocketServer } from '../server'
+import { Request } from '../server/request'
 
 import { NettyClient } from './client'
-import { Keys } from './constants'
+import { AttributeKeys, Keys } from './constants'
 import { WebSocketDetect } from './websocket_detect'
 import { WebSocketHandler } from './websocket_handler'
 
-class NettyWebSocketServer extends EventEmitter {
-    private pipeline: any
-    private clients: Map<string, NettyClient>
+class NettyWebSocketServer extends WebSocketServer {
+    constructor(pipeline: any, options: JavaServerOptions) {
+        super(pipeline, options)
+    }
 
-    constructor(pipeline: any, options: ServerOptions) {
-        super()
-        this.clients = new Map()
-        this.pipeline = pipeline
-        let connectEvent = options.event
-        try { this.pipeline.remove(Keys.Detect) } catch (error) { }
-        this.pipeline.addFirst(Keys.Detect, new WebSocketDetect(connectEvent).getHandler())
+    protected initialize() {
+        let connectEvent = this.options.event
+        try { this.instance.remove(Keys.Detect) } catch (error) { }
+        this.instance.addFirst(Keys.Detect, new WebSocketDetect(connectEvent).getHandler())
         connectEvent.on(ServerEvent.detect, (ctx, channel) => {
-            channel.pipeline().addFirst(Keys.Handler, new WebSocketHandler(options).getHandler())
+            channel.pipeline().addFirst(Keys.Handler, new WebSocketHandler(this.options).getHandler())
             ctx.fireChannelRead(channel)
         })
         connectEvent.on(ServerEvent.connect, (ctx) => {
-            let cid = ctx?.channel().id() + ''
-            let nettyClient = new NettyClient(this, ctx.channel())
-            this.clients.set(cid, nettyClient)
-            this.emit(ServerEvent.connect, nettyClient)
+            this.onconnect(ctx)
         })
         connectEvent.on(ServerEvent.message, (ctx, msg) => {
-            let cid = ctx?.channel().id() + ''
-            if (this.clients.has(cid)) {
-                this.emit(ServerEvent.message, this.clients.get(cid), msg.text())
-            } else if (global.debug) {
-                console.error(`unknow client ${ctx} reciver message ${msg.text()}`)
-            }
+            this.onmessage(ctx, msg.text())
         })
         connectEvent.on(ServerEvent.disconnect, (ctx, cause) => {
-            let cid = ctx?.channel().id() + ''
-            if (this.clients.has(cid)) {
-                this.emit(ServerEvent.disconnect, this.clients.get(cid), cause)
-            } else if (global.debug) {
-                console.error(`unknow client ${ctx} disconnect cause ${cause}`)
-            }
+            this.ondisconnect(ctx, cause)
         })
-        connectEvent.on(ServerEvent.error, (ctx, cause) => {
-            let cid = ctx?.channel().id() + ''
-            if (this.clients.has(cid)) {
-                this.emit(ServerEvent.error, this.clients.get(cid), cause)
-            } else if (global.debug) {
-                console.error(`unknow client ${ctx} cause error ${cause}`)
-                console.ex(cause)
-            }
+        connectEvent.on(ServerEvent.error, (ctx, error) => {
+            this.onerror(ctx, error)
         })
     }
-    close() {
-        if (this.pipeline.names().contains(Keys.Detect)) {
-            this.pipeline.remove(Keys.Detect)
+
+    protected getId(ctx: any) {
+        try {
+            return ctx.channel().id() + ''
+        } catch (error) {
+            console.log(Object.toString.apply(ctx))
+            console.ex(error)
+        }
+    }
+
+    protected getRequest(ctx) {
+        let channel = ctx.channel()
+        let req = channel.attr(AttributeKeys.Request).get()
+        let headers = {}
+        let nativeHeaders = req.headers()
+        nativeHeaders.forEach(function (header) {
+            headers[header.getKey()] = header.getValue()
+        })
+        let request = new Request(req.uri(), req.method().name(), headers)
+        request.connection = {
+            remoteAddress: channel.remoteAddress() + ''
+        }
+        return request
+    }
+
+    protected getSocket(ctx) {
+        return new NettyClient(ctx.channel())
+    }
+
+    protected doClose() {
+        if (this.instance.names().contains(Keys.Detect)) {
+            this.instance.remove(Keys.Detect)
         }
-        this.clients.forEach(client => client.close())
     }
 }
 
diff --git a/packages/websocket/src/netty/text_websocket_frame.ts b/packages/websocket/src/netty/text_websocket_frame.ts
index deaec789..e0d1fd7f 100644
--- a/packages/websocket/src/netty/text_websocket_frame.ts
+++ b/packages/websocket/src/netty/text_websocket_frame.ts
@@ -1,11 +1,11 @@
 import { EventEmitter } from 'events'
-import { ServerOptions } from '../socket-io'
-import { ServerEvent } from '../socket-io/constants'
+import { JavaServerOptions, ServerEvent } from '../server'
+
 import { TextWebSocketFrameHandlerAdapter } from './adapter'
 
 export class TextWebSocketFrameHandler extends TextWebSocketFrameHandlerAdapter {
     private event: EventEmitter
-    constructor(options: ServerOptions) {
+    constructor(options: JavaServerOptions) {
         super()
         this.event = options.event
     }
diff --git a/packages/websocket/src/netty/websocket_detect.ts b/packages/websocket/src/netty/websocket_detect.ts
index 6b29df01..4122a3fb 100644
--- a/packages/websocket/src/netty/websocket_detect.ts
+++ b/packages/websocket/src/netty/websocket_detect.ts
@@ -1,6 +1,7 @@
 import { EventEmitter } from 'events'
 import { WebSocketHandlerAdapter } from "./adapter"
-import { ServerEvent } from '../socket-io/constants'
+
+import { ServerEvent } from '../server'
 
 export class WebSocketDetect extends WebSocketHandlerAdapter {
     private event: EventEmitter
diff --git a/packages/websocket/src/netty/websocket_handler.ts b/packages/websocket/src/netty/websocket_handler.ts
index 8ef10f5e..1b40898b 100644
--- a/packages/websocket/src/netty/websocket_handler.ts
+++ b/packages/websocket/src/netty/websocket_handler.ts
@@ -1,5 +1,4 @@
-import { ServerOptions } from '../socket-io'
-import { ServerEvent } from '../socket-io/constants'
+import { JavaServerOptions, ServerEvent } from '../server'
 
 import { Keys } from './constants'
 import { HttpRequestHandler } from './httprequest'
@@ -13,8 +12,8 @@ const HttpObjectAggregator = Java.type('io.netty.handler.codec.http.HttpObjectAg
 const WebSocketServerProtocolHandler = Java.type('io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler')
 
 export class WebSocketHandler extends WebSocketHandlerAdapter {
-    private options: ServerOptions
-    constructor(options: ServerOptions) {
+    private options: JavaServerOptions
+    constructor(options: JavaServerOptions) {
         super()
         this.options = options
     }
diff --git a/packages/websocket/src/server/client.ts b/packages/websocket/src/server/client.ts
new file mode 100644
index 00000000..e9c953f5
--- /dev/null
+++ b/packages/websocket/src/server/client.ts
@@ -0,0 +1,7 @@
+import { EventEmitter } from 'events'
+export abstract class WebSocketClient extends EventEmitter {
+    public id: string
+    public _socket: any
+    abstract send(text: string, opts?: any, callback?: (err?: Error) => void)
+    abstract close()
+}
diff --git a/packages/websocket/src/server/index.ts b/packages/websocket/src/server/index.ts
index 788f3f3d..c888d85e 100644
--- a/packages/websocket/src/server/index.ts
+++ b/packages/websocket/src/server/index.ts
@@ -1,52 +1,90 @@
 import { EventEmitter } from 'events'
+import { ServerOptions } from '../socket.io'
+import { WebSocketClient } from './client'
 
-import { Transport } from '../transport'
+import type { Request } from './request'
 
-interface ServerOptions {
+export enum ServerEvent {
+    detect = 'detect',
+    request = 'request',
+    upgrade = 'upgrade',
+    connect = 'connect',
+    connection = 'connection',
+    message = 'message',
+    error = 'error',
+    disconnecting = 'disconnecting',
+    disconnect = 'disconnect',
+}
+
+export interface JavaServerOptions extends ServerOptions {
     event?: EventEmitter
     root?: string
-    /**
-     * name of the path to capture
-     * @default "/socket.io"
-     */
-    path: string
 }
 
-interface WebSocketServerImpl extends EventEmitter {
-    close(): void
-}
-
-export class WebSocketServer extends EventEmitter {
-    options: Partial<ServerOptions>
-    private websocketServer: WebSocketServerImpl
-
-    constructor(instance: any, options: Partial<ServerOptions>) {
+export abstract class WebSocketServer extends EventEmitter {
+    protected instance: any
+    protected options: JavaServerOptions
+    private clients: Map<string, WebSocketClient>
+    constructor(instance: any, options: JavaServerOptions) {
         super()
-        if (!instance) { throw new Error('instance can\'t be undefiend!') }
-        this.options = Object.assign({
-            event: new EventEmitter(),
-            path: '/ws',
-            root: root + '/wwwroot',
-        }, options)
-        this.selectServerImpl(instance)
+        this.instance = instance
+        this.options = options
+        this.clients = new Map()
+        console.debug('create websocket server from ' + this.constructor.name)
+        this.initialize()
     }
-
-    on(event: "connect", cb: (transport: Transport) => void): this
-    on(event: "message", cb: (transport: Transport, text: string) => void): this
-    on(event: "disconnect", cb: (transport: Transport, reason: string) => void): this
-    on(event: "error", cb: (transport: Transport, cause: Error) => void): this
-    on(event: string, cb: (transport: Transport, extra?: any) => void): this {
-        this.websocketServer.on(event, cb)
-        return this
+    protected onconnect(handler: any) {
+        let id = this.getId(handler)
+        console.log('client', id, 'connect')
+        let request = this.getRequest(handler)
+        request.id = id
+        let websocket = this.getSocket(handler)
+        this.clients.set(this.getId(handler), websocket)
+        this.emit(ServerEvent.connect, request, websocket)
     }
-
-    private selectServerImpl(instance: any) {
-        let WebSocketServerImpl = undefined
-        if (instance.class.name.startsWith('io.netty.channel')) {
-            WebSocketServerImpl = require("../netty").NettyWebSocketServer
-        } else {
-            WebSocketServerImpl = require("../tomcat").TomcatWebSocketServer
+    protected onmessage(handler: any, message: string) {
+        this.execute(handler, (websocket) => websocket.emit(ServerEvent.message, message))
+    }
+    protected ondisconnect(handler: any, cause: string) {
+        this.execute(handler, (websocket) => websocket.emit(ServerEvent.disconnect, cause))
+    }
+    protected onerror(handler: any, error: Error) {
+        if (global.debug) {
+            console.ex(error)
         }
-        this.websocketServer = new WebSocketServerImpl(instance, this.options)
+        this.execute(handler, (websocket) => websocket.emit(ServerEvent.error, error))
     }
+    protected execute(handler: any, callback: (websocket: WebSocketClient) => void) {
+        let id = this.getId(handler)
+        if (this.clients.has(id)) {
+            this.clients.has(id) && callback(this.clients.get(id))
+        } else {
+            console.debug('ignore execute', handler, 'callback', callback)
+        }
+    }
+    public close() {
+        this.clients.forEach(websocket => websocket.close())
+        this.doClose()
+    }
+    protected abstract initialize(): void
+    protected abstract getId(handler: any): string
+    protected abstract getRequest(handler: any): Request
+    protected abstract getSocket(handler: any): WebSocketClient
+    protected abstract doClose(): void
+}
+
+export const attach = (instance, options) => {
+    if (!instance) { throw new Error('instance can\'t be undefiend!') }
+    options = Object.assign({
+        event: new EventEmitter(),
+        path: '/ws',
+        root: root + '/wwwroot',
+    }, options)
+    let WebSocketServerImpl = undefined
+    if (instance.class.name.startsWith('io.netty.channel')) {
+        WebSocketServerImpl = require("../netty").NettyWebSocketServer
+    } else {
+        WebSocketServerImpl = require("../tomcat").TomcatWebSocketServer
+    }
+    return new WebSocketServerImpl(instance, options)
 }
diff --git a/packages/websocket/src/server/request.ts b/packages/websocket/src/server/request.ts
new file mode 100644
index 00000000..45a4c9af
--- /dev/null
+++ b/packages/websocket/src/server/request.ts
@@ -0,0 +1,23 @@
+import { WebSocketClient } from "./client"
+interface HttpHeaders {
+    [name: string]: string
+}
+interface Connection {
+    remoteAddress: string
+}
+export class Request {
+    public id: string
+    public url: string
+    public method: string
+    public headers: HttpHeaders
+    public connection: Connection
+    public websocket: WebSocketClient
+
+    public _query: any
+
+    constructor(url: string, method = "GET", headers = {}) {
+        this.url = url
+        this.method = method
+        this.headers = headers
+    }
+}
diff --git a/packages/websocket/src/socket-io/adapter.ts b/packages/websocket/src/socket-io/adapter.ts
deleted file mode 100644
index efd25120..00000000
--- a/packages/websocket/src/socket-io/adapter.ts
+++ /dev/null
@@ -1,164 +0,0 @@
-import { EventEmitter } from 'events'
-import { Namespace } from './namespace'
-import { Parser } from './parser'
-import { Socket } from './socket'
-
-export type SocketId = string
-export type Room = string
-
-export interface BroadcastFlags {
-    volatile?: boolean
-    compress?: boolean
-    local?: boolean
-    broadcast?: boolean
-    binary?: boolean
-}
-
-export interface BroadcastOptions {
-    rooms: Set<Room>
-    except?: Set<SocketId>
-    flags?: BroadcastFlags
-}
-
-export class Adapter extends EventEmitter implements Adapter {
-    rooms: Map<Room, Set<SocketId>>
-    sids: Map<SocketId, Set<Room>>
-    private readonly encoder: Parser
-    parser: Parser
-
-    constructor(readonly nsp: Namespace) {
-        super()
-        this.rooms = new Map()
-        this.sids = new Map()
-        this.parser = nsp.server._parser
-        this.encoder = this.parser
-    }
-
-    /**
-     * Adds a socket to a list of room.
-     *
-     * @param {String} socket id
-     * @param {String} rooms
-     * @param {Function} callback
-     * @api public
-     */
-    addAll(id: SocketId, rooms: Set<Room>): Promise<void> | void {
-        for (const room of rooms) {
-            if (!this.sids.has(id)) {
-                this.sids.set(id, new Set())
-            }
-            this.sids.get(id).add(room)
-
-            if (!this.rooms.has(room)) {
-                this.rooms.set(room, new Set())
-            }
-            this.rooms.get(room).add(id)
-        }
-    }
-    del(id: string, room: string, callback?: (err?: any) => void): void {
-        if (this.sids.has(id)) {
-            this.sids.get(id).delete(room)
-        }
-
-        if (this.rooms.has(room)) {
-            this.rooms.get(room).delete(id)
-            if (this.rooms.get(room).size === 0) this.rooms.delete(room)
-        }
-        callback && callback.bind(null, null)
-    }
-    delAll(id: string): void {
-        if (!this.sids.has(id)) {
-            return
-        }
-
-        for (const room of this.sids.get(id)) {
-            if (this.rooms.has(room)) {
-                this.rooms.get(room).delete(id)
-                if (this.rooms.get(room).size === 0) this.rooms.delete(room)
-            }
-        }
-
-        this.sids.delete(id)
-    }
-
-    /**
-     * Broadcasts a packet.
-     *
-     * Options:
-     *  - `flags` {Object} flags for this packet
-     *  - `except` {Array} sids that should be excluded
-     *  - `rooms` {Array} list of rooms to broadcast to
-     *
-     * @param {Object} packet   the packet object
-     * @param {Object} opts     the options
-     * @public
-     */
-    public broadcast(packet: any, opts: BroadcastOptions): void {
-        const rooms = opts.rooms
-        const except = opts.except || new Set()
-        const flags = opts.flags || {}
-        const packetOpts = {
-            preEncoded: true,
-            volatile: flags.volatile,
-            compress: flags.compress
-        }
-        const ids = new Set()
-
-        packet.nsp = this.nsp.name
-        const encodedPackets = this.encoder.encode(packet)
-
-        if (rooms.size) {
-            for (const room of rooms) {
-                if (!this.rooms.has(room)) continue
-
-                for (const id of this.rooms.get(room)) {
-                    if (ids.has(id) || except.has(id)) continue
-                    const socket = this.nsp.sockets.get(id)
-                    if (socket) {
-                        socket.packet(encodedPackets as any, packetOpts)
-                        ids.add(id)
-                    }
-                }
-            }
-        } else {
-            for (const [id] of this.sids) {
-                if (except.has(id)) continue
-                const socket = this.nsp.sockets.get(id)
-                if (socket) socket.packet(encodedPackets as any, packetOpts)
-            }
-        }
-    }
-
-    /**
-     * Gets a list of sockets by sid.
-     *
-     * @param {Set<Room>} rooms   the explicit set of rooms to check.
-     */
-    public sockets(rooms: Set<Room>): Promise<Set<SocketId>> {
-        const sids = new Set<SocketId>()
-        if (rooms.size) {
-            for (const room of rooms) {
-                if (!this.rooms.has(room)) continue
-                for (const id of this.rooms.get(room)) {
-                    if (this.nsp.sockets.has(id)) {
-                        sids.add(id)
-                    }
-                }
-            }
-        } else {
-            for (const [id] of this.sids) {
-                if (this.nsp.sockets.has(id)) sids.add(id)
-            }
-        }
-        return Promise.resolve(sids)
-    }
-
-    /**
-     * Gets the list of rooms a given socket has joined.
-     *
-     * @param {SocketId} id   the socket id
-     */
-    public socketRooms(id: SocketId): Set<Room> | undefined {
-        return this.sids.get(id)
-    }
-}
diff --git a/packages/websocket/src/socket-io/client.ts b/packages/websocket/src/socket-io/client.ts
deleted file mode 100644
index 0f20dbd4..00000000
--- a/packages/websocket/src/socket-io/client.ts
+++ /dev/null
@@ -1,360 +0,0 @@
-import { EventEmitter } from 'events'
-import { Parser } from './parser'
-import { Packet } from './packet'
-import { Namespace, Server, Socket } from './index'
-import { PacketTypes, SubPacketTypes } from './types'
-import { ServerEvent } from './constants'
-import { SocketId } from './adapter'
-import { Transport } from '../transport'
-
-const parser = new Parser()
-
-export class Client extends EventEmitter {
-    public readonly conn: Transport
-    /**
-     * @private
-     */
-    readonly id: string
-    private readonly server: Server
-    // private readonly encoder: Encoder
-    private readonly decoder: any
-    private sockets: Map<SocketId, Socket>
-    private nsps: Map<string, Socket>
-    private connectTimeout: NodeJS.Timeout
-
-    private checkIntervalTimer: NodeJS.Timeout
-    private upgradeTimeoutTimer: NodeJS.Timeout
-    private pingTimeoutTimer: NodeJS.Timeout
-    private pingIntervalTimer: NodeJS.Timeout
-
-    constructor(server: Server, conn) {
-        super()
-        this.server = server
-        this.conn = conn
-        // this.encoder = server.encoder
-        this.decoder = server._parser
-        this.id = this.conn.id + ''
-        this.setup()
-        // =============================
-        this.sockets = new Map()
-        this.nsps = new Map()
-        // ================== engine.io
-        this.onOpen()
-        // ================== Transport
-        this.conn.on(ServerEvent.disconnect, (reason) => {
-            this.onclose(reason)
-        })
-    }
-    /**
-     * @return the reference to the request that originated the Engine.IO connection
-     *
-     * @public
-     */
-    public get request(): any /**IncomingMessage */ {
-        return this.conn.request
-    }
-    /**
-     * Sets up event listeners.
-     *
-     * @private
-     */
-    private setup() {
-        // @ts-ignore
-        // this.decoder.on("decoded", this.ondecoded)
-        this.conn.on("data", this.ondata.bind(this))
-        this.conn.on("error", this.onerror.bind(this))
-        this.conn.on("close", this.onclose.bind(this))
-        console.debug(`setup client ${this.id}`)
-        this.connectTimeout = setTimeout(() => {
-            if (this.nsps.size === 0) {
-                console.debug("no namespace joined yet, close the client")
-                this.close()
-            } else {
-                console.debug("the client has already joined a namespace, nothing to do")
-            }
-        }, this.server._connectTimeout)
-    }
-    /**
-     * Connects a client to a namespace.
-     *
-     * @param {String} name - the namespace
-     * @param {Object} auth - the auth parameters
-     * @private
-     */
-    private connect(name: string, auth: object = {}) {
-        console.debug(`client ${this.id} connecting to namespace ${name} has: ${this.server._nsps.has(name)}`)
-        if (this.server._nsps.has(name)) {
-            return this.doConnect(name, auth)
-        }
-
-        this.server._checkNamespace(name, auth, (dynamicNsp: Namespace) => {
-            if (dynamicNsp) {
-                console.debug(`dynamic namespace ${dynamicNsp.name} was created`)
-                this.doConnect(name, auth)
-            } else {
-                console.debug(`creation of namespace ${name} was denied`)
-                this._packet({
-                    type: PacketTypes.MESSAGE,
-                    sub_type: SubPacketTypes.ERROR,
-                    nsp: name,
-                    data: {
-                        message: "Invalid namespace"
-                    }
-                })
-            }
-        })
-    }
-    doConnect(name, auth: object) {
-        if (this.connectTimeout) {
-            clearTimeout(this.connectTimeout)
-            this.connectTimeout = null
-        }
-        const nsp = this.server.of(name)
-
-        nsp._add(this, auth, (socket: Socket) => {
-            this.sockets.set(socket.id, socket)
-            this.nsps.set(nsp.name, socket)
-        })
-    }
-    /**
-     * Disconnects from all namespaces and closes transport.
-     *
-     * @private
-     */
-    _disconnect() {
-        for (const socket of this.sockets.values()) {
-            socket.disconnect()
-        }
-        this.sockets.clear()
-        this.close()
-    }
-    /**
-     * Removes a socket. Called by each `Socket`.
-     *
-     * @private
-     */
-    _remove(socket: Socket) {
-        if (this.sockets.has(socket.id)) {
-            this.sockets.delete(socket.id)
-            this.nsps.delete(socket.nsp.name)
-        } else {
-            console.debug(`ignoring remove for ${socket.id}`,)
-        }
-        process.nextTick(() => {
-            if (this.sockets.size == 0) {
-                this.onclose('no live socket')
-            }
-        })
-    }
-    /**
-     * Closes the underlying connection.
-     *
-     * @private
-     */
-    private close() {
-        console.debug(`client ${this.id} close`)
-        if ("open" == this.conn.readyState) {
-            console.debug("forcing transport close")
-            this.onclose("forced server close")
-            this.conn.close()
-        }
-    }
-    /**
-     * Writes a packet to the transport.
-     *
-     * @param {Object} packet object
-     * @param {Object} opts
-     * @private
-     */
-    _packet(packet: Packet, opts = { preEncoded: false }) {
-        // opts = opts || {}
-        // const self = this
-
-        // // this writes to the actual connection
-        // function writeToEngine(encodedPackets) {
-        //     if (opts.volatile && !self.conn.transport.writable) return
-        //     for (let i = 0; i < encodedPackets.length; i++) {
-        //         self.conn.write(encodedPackets[i], { compress: opts.compress })
-        //     }
-        // }
-
-        // if ("open" == this.conn.readyState) {
-        //     debug("writing packet %j", packet)
-        //     if (!opts.preEncoded) {
-        //         // not broadcasting, need to encode
-        //         writeToEngine(this.encoder.encode(packet)) // encode, then write results to engine
-        //     } else {
-        //         // a broadcast pre-encodes a packet
-        //         writeToEngine(packet)
-        //     }
-        // } else {
-        //     debug("ignoring packet write %j", packet)
-        // }
-        if ("open" == this.conn.readyState) {
-            this.conn.send(opts.preEncoded ? packet as unknown as string : parser.encode(packet))
-        } else {
-            console.debug(`ignoring write packet ${JSON.stringify(packet)} to client ${this.id} is already close!`)
-        }
-    }
-    /**
-     * Called with incoming transport data.
-     *
-     * @private
-     */
-    private ondata(data) {
-        // try/catch is needed for protocol violations (GH-1880)
-        try {
-            this.decoder.add(data)
-        } catch (e) {
-            this.onerror(e)
-        }
-    }
-    /**
-     * Called when parser fully decodes a packet.
-     *
-     * @private
-     */
-    ondecoded(packet: Packet) {
-        if (SubPacketTypes.CONNECT == packet.sub_type) {
-            this.connect(packet.nsp, packet.data)
-        } else {
-            process.nextTick(() => {
-                const socket = this.nsps.get(packet.nsp)
-                if (socket) {
-                    socket._onpacket(packet)
-                } else {
-                    console.debug(`client ${this.id} no socket for namespace ${packet.nsp}.`)
-                }
-            })
-        }
-    }
-    /**
-     * Handles an error.
-     *
-     * @param {Object} err object
-     * @private
-     */
-    private onerror(err) {
-        for (const socket of this.sockets.values()) {
-            socket._onerror(err)
-        }
-        this.conn.close()
-    }
-    onclose(reason?: string) {
-        this.conn.readyState = "closing"
-        // ======= engine.io
-        this.onClose(reason)
-        // cleanup connectTimeout
-        if (this.connectTimeout) {
-            clearTimeout(this.connectTimeout)
-            this.connectTimeout = null
-        }
-        console.debug(`client ${this.id} close with reason ${reason}`)
-        // ignore a potential subsequent `close` event
-        // `nsps` and `sockets` are cleaned up seamlessly
-        for (const socket of this.sockets.values()) {
-            socket._onclose(reason)
-        }
-        this.sockets.clear()
-        // this.decoder.destroy(); // clean up decoder
-    }
-
-    destroy() {
-        // this.conn.removeListener('data', this.ondata);
-        // this.conn.removeListener('error', this.onerror);
-        // this.conn.removeListener('close', this.onclose);
-        // this.decoder.removeListener('decoded', this.ondecoded);
-    }
-
-    //================== engine.io
-    onOpen() {
-        this.conn.readyState = "open"
-        this._packet({
-            type: PacketTypes.OPEN,
-            data: {
-                sid: this.id,
-                upgrades: [],
-                pingInterval: this.server.options.pingInterval,
-                pingTimeout: this.server.options.pingTimeout
-            }
-        })
-        this.schedulePing()
-    }
-
-    onPacket(packet: Packet) {
-        if ("open" === this.conn.readyState) {
-            // export packet event
-            // debug("packet")
-            // this.emit("packet", packet)
-
-            // Reset ping timeout on any packet, incoming data is a good sign of
-            // other side's liveness
-            this.resetPingTimeout(this.server.options.pingInterval + this.server.options.pingTimeout * 2)
-            switch (packet.type) {
-                case PacketTypes.PING:
-                    this._packet({
-                        type: PacketTypes.PONG,
-                        data: packet.data
-                    })
-                    break
-                case PacketTypes.PONG:
-                    this.schedulePing()
-                    break
-                case PacketTypes.UPGRADE:
-                    break
-                case PacketTypes.MESSAGE:
-                    this.ondecoded(packet)
-                    break
-                case PacketTypes.CLOSE:
-                    this.onclose()
-                    break
-                default:
-                    console.log(`client ${this.id} reciver unknow packet type: ${packet.type}`)
-            }
-        } else {
-            console.debug(`packet received with closed client ${this.id}`)
-        }
-    }
-    /**
-     * Called upon transport considered closed.
-     * Possible reasons: `ping timeout`, `client error`, `parse error`,
-     * `transport error`, `server close`, `transport close`
-     */
-    onClose(reason, description?: string) {
-        // if ("closed" !== this.conn.readyState) {
-        clearTimeout(this.pingIntervalTimer)
-        clearTimeout(this.pingTimeoutTimer)
-
-        clearInterval(this.checkIntervalTimer)
-        this.checkIntervalTimer = null
-        clearTimeout(this.upgradeTimeoutTimer)
-        //     this.emit("close", reason, description)
-        // }
-    }
-    /**
-     * Pings client every `this.pingInterval` and expects response
-     * within `this.pingTimeout` or closes connection.
-     *
-     * @api private
-     */
-    schedulePing() {
-        clearTimeout(this.pingIntervalTimer)
-        this.pingIntervalTimer = setTimeout(() => {
-            this.resetPingTimeout(this.server.options.pingTimeout)
-            process.nextTick(() => this._packet({ type: PacketTypes.PING }))
-        }, this.server.options.pingInterval)
-    }
-
-    /**
-     * Resets ping timeout.
-     *
-     * @api private
-     */
-    resetPingTimeout(timeout: number) {
-        clearTimeout(this.pingTimeoutTimer)
-        this.pingTimeoutTimer = setTimeout(() => {
-            if (this.conn.readyState === "closed") return
-            this.onclose("ping timeout")
-        }, timeout)
-    }
-}
diff --git a/packages/websocket/src/socket-io/constants.ts b/packages/websocket/src/socket-io/constants.ts
deleted file mode 100644
index ba29e36c..00000000
--- a/packages/websocket/src/socket-io/constants.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-export enum ServerEvent {
-    detect = 'detect',
-    connect = 'connect',
-    connection = 'connection',
-    message = 'message',
-    error = 'error',
-    disconnecting = 'disconnecting',
-    disconnect = 'disconnect',
-}
diff --git a/packages/websocket/src/socket-io/index.ts b/packages/websocket/src/socket-io/index.ts
deleted file mode 100644
index d59234e4..00000000
--- a/packages/websocket/src/socket-io/index.ts
+++ /dev/null
@@ -1,677 +0,0 @@
-import { EventEmitter } from 'events'
-
-import { ServerEvent } from './constants'
-import { Namespace } from './namespace'
-import { Client } from './client'
-import { Parser } from './parser'
-import { Socket } from './socket'
-import { Adapter } from './adapter'
-import { Transport } from '../transport'
-import { ParentNamespace } from './parent-namespace'
-
-interface EngineOptions {
-    /**
-     * how many ms without a pong packet to consider the connection closed
-     * @default 5000
-     */
-    pingTimeout: number
-    /**
-     * how many ms before sending a new ping packet
-     * @default 25000
-     */
-    pingInterval: number
-    /**
-     * how many ms before an uncompleted transport upgrade is cancelled
-     * @default 10000
-     */
-    upgradeTimeout: number
-    /**
-     * how many bytes or characters a message can be, before closing the session (to avoid DoS).
-     * @default 1e5 (100 KB)
-     */
-    maxHttpBufferSize: number
-    /**
-     * A function that receives a given handshake or upgrade request as its first parameter,
-     * and can decide whether to continue or not. The second argument is a function that needs
-     * to be called with the decided information: fn(err, success), where success is a boolean
-     * value where false means that the request is rejected, and err is an error code.
-     */
-    // allowRequest: (
-    //     req: http.IncomingMessage,
-    //     fn: (err: string | null | undefined, success: boolean) => void
-    // ) => void
-    /**
-     * the low-level transports that are enabled
-     * @default ["polling", "websocket"]
-     */
-    // transports: Transport[]
-    /**
-     * whether to allow transport upgrades
-     * @default true
-     */
-    allowUpgrades: boolean
-    /**
-     * parameters of the WebSocket permessage-deflate extension (see ws module api docs). Set to false to disable.
-     * @default false
-     */
-    perMessageDeflate: boolean | object
-    /**
-     * parameters of the http compression for the polling transports (see zlib api docs). Set to false to disable.
-     * @default true
-     */
-    httpCompression: boolean | object
-    /**
-     * what WebSocket server implementation to use. Specified module must
-     * conform to the ws interface (see ws module api docs). Default value is ws.
-     * An alternative c++ addon is also available by installing uws module.
-     */
-    wsEngine: string
-    /**
-     * an optional packet which will be concatenated to the handshake packet emitted by Engine.IO.
-     */
-    initialPacket: any
-    /**
-     * configuration of the cookie that contains the client sid to send as part of handshake response headers. This cookie
-     * might be used for sticky-session. Defaults to not sending any cookie.
-     * @default false
-     */
-    // cookie: CookieSerializeOptions | boolean
-    /**
-     * the options that will be forwarded to the cors module
-     */
-    // cors: CorsOptions
-}
-
-interface AttachOptions {
-    /**
-     * name of the path to capture
-     * @default "/engine.io"
-     */
-    path: string
-    /**
-     * destroy unhandled upgrade requests
-     * @default true
-     */
-    destroyUpgrade: boolean
-    /**
-     * milliseconds after which unhandled requests are ended
-     * @default 1000
-     */
-    destroyUpgradeTimeout: number
-}
-
-interface EngineAttachOptions extends EngineOptions, AttachOptions { }
-
-interface ServerOptions extends EngineAttachOptions {
-    event?: EventEmitter
-    root?: string
-    /**
-     * name of the path to capture
-     * @default "/socket.io"
-     */
-    path: string
-    /**
-     * whether to serve the client files
-     * @default true
-     */
-    serveClient: boolean
-    /**
-     * the adapter to use
-     * @default the in-memory adapter (https://github.com/socketio/socket.io-adapter)
-     */
-    adapter: any
-    /**
-     * the parser to use
-     * @default the default parser (https://github.com/socketio/socket.io-parser)
-     */
-    parser: any
-    /**
-     * how many ms before a client without namespace is closed
-     * @default 45000
-     */
-    connectTimeout: number
-}
-
-interface WebSocketServer extends EventEmitter {
-    close(): void
-}
-
-class Server {
-    public readonly sockets: Namespace
-
-    /**
-     * @private
-     */
-    _parser: Parser
-    private readonly encoder
-
-    /**
-     * @private
-     */
-    _nsps: Map<string, Namespace>
-    private parentNsps: Map<
-        | string
-        | RegExp
-        | ((
-            name: string,
-            query: object,
-            fn: (err: Error, success: boolean) => void
-        ) => void),
-        ParentNamespace
-    > = new Map();
-    private _adapter: Adapter
-    // private _serveClient: boolean;
-    private eio
-    private engine: { ws: any }
-    private _path: string
-    private clientPathRegex: RegExp
-    /**
-     * @private
-     */
-    _connectTimeout: number
-
-    options: Partial<ServerOptions>
-    private websocketServer: WebSocketServer
-    private allClients: Map<string, Client>
-
-    constructor(instance: any, options: Partial<ServerOptions>) {
-        if (!instance) { throw new Error('instance can\'t be undefiend!') }
-        this.options = Object.assign({
-            event: new EventEmitter(),
-            path: '/socket.io',
-            root: root + '/wwwroot',
-            serveClient: false,
-            connectTimeout: 45000,
-            wsEngine: process.env.EIO_WS_ENGINE || "ws",
-            pingTimeout: 5000,
-            pingInterval: 25000,
-            upgradeTimeout: 10000,
-            maxHttpBufferSize: 1e6,
-            transports: 'websocket',
-            allowUpgrades: true,
-            httpCompression: {
-                threshold: 1024
-            },
-            cors: false
-        }, options)
-        this.initServerConfig()
-        this.sockets = this.of('/')
-        this.selectServerImpl(instance)
-        this.initServer()
-    }
-    /**
-     * Sets/gets whether client code is being served.
-     *
-     * @param {Boolean} v - whether to serve client code
-     * @return {Server|Boolean} self when setting or value when getting
-     * @public
-     */
-    public serveClient(v: boolean): Server
-    public serveClient(): boolean
-    public serveClient(v?: boolean): Server | boolean {
-        throw new Error("Method not implemented.")
-    }
-    /**
-     * Executes the middleware for an incoming namespace not already created on the server.
-     *
-     * @param {String} name - name of incoming namespace
-     * @param {Object} auth - the auth parameters
-     * @param {Function} fn - callback
-     *
-     * @private
-     */
-    _checkNamespace(
-        name: string,
-        auth: object,
-        fn: (nsp: Namespace) => void
-    ) {
-        // if (this.parentNsps.size === 0) return fn(false)
-
-        // const keysIterator = this.parentNsps.keys()
-
-        // const run = () => {
-        //     let nextFn = keysIterator.next()
-        //     if (nextFn.done) {
-        //         return fn(false)
-        //     }
-        //     nextFn.value(name, auth, (err, allow) => {
-        //         if (err || !allow) {
-        //             run()
-        //         } else {
-        //             fn(this.parentNsps.get(nextFn.value).createChild(name))
-        //         }
-        //     })
-        // }
-        fn(undefined)
-    }
-    /**
-     * Sets the client serving path.
-     *
-     * @param {String} v pathname
-     * @return {Server|String} self when setting or value when getting
-     * @public
-     */
-    path(): string
-    path(v: string): Server
-    path(v?: any): string | Server {
-        if (!arguments.length) return this._path
-
-        this._path = v.replace(/\/$/, "")
-
-        const escapedPath = this._path.replace(/[-\/\\^$*+?.()|[\]{}]/g, "\\$&")
-        this.clientPathRegex = new RegExp(
-            "^" +
-            escapedPath +
-            "/socket\\.io(\\.min|\\.msgpack\\.min)?\\.js(\\.map)?$"
-        )
-        return this
-    }
-    /**
-     * Set the delay after which a client without namespace is closed
-     * @param v
-     * @public
-     */
-    public connectTimeout(v: number): Server
-    public connectTimeout(): number
-    public connectTimeout(v?: number): Server | number {
-        if (v === undefined) return this._connectTimeout
-        this._connectTimeout = v
-        return this
-    }
-    /**
-     * Sets the adapter for rooms.
-     *
-     * @param {Adapter} v pathname
-     * @return {Server|Adapter} self when setting or value when getting
-     * @public
-     */
-    public adapter(): any
-    public adapter(v: any)
-    public adapter(v?): Server | any {
-        if (!arguments.length) return this._adapter
-        this._adapter = v
-        for (const nsp of this._nsps.values()) {
-            nsp._initAdapter()
-        }
-        return this
-    }
-    // /**
-    //  * Attaches socket.io to a server or port.
-    //  *
-    //  * @param {http.Server|Number} srv - server or port
-    //  * @param {Object} opts - options passed to engine.io
-    //  * @return {Server} self
-    //  * @public
-    //  */
-    // public listen(srv: http.Server, opts?: Partial<ServerOptions>): Server
-    // public listen(srv: number, opts?: Partial<ServerOptions>): Server
-    // public listen(srv: any, opts: Partial<ServerOptions> = {}): Server {
-    //     return this.attach(srv, opts)
-    // }
-
-    // /**
-    //  * Attaches socket.io to a server or port.
-    //  *
-    //  * @param {http.Server|Number} srv - server or port
-    //  * @param {Object} opts - options passed to engine.io
-    //  * @return {Server} self
-    //  * @public
-    //  */
-    // public attach(srv: http.Server, opts?: Partial<ServerOptions>): Server
-    // public attach(port: number, opts?: Partial<ServerOptions>): Server
-    // public attach(srv: any, opts: Partial<ServerOptions> = {}): Server {
-    //     if ("function" == typeof srv) {
-    //         const msg =
-    //             "You are trying to attach socket.io to an express " +
-    //             "request handler function. Please pass a http.Server instance."
-    //         throw new Error(msg)
-    //     }
-
-    //     // handle a port as a string
-    //     if (Number(srv) == srv) {
-    //         srv = Number(srv)
-    //     }
-
-    //     if ("number" == typeof srv) {
-    //         debug("creating http server and binding to %d", srv)
-    //         const port = srv
-    //         srv = http.createServer((req, res) => {
-    //             res.writeHead(404)
-    //             res.end()
-    //         })
-    //         srv.listen(port)
-    //     }
-
-    //     // set engine.io path to `/socket.io`
-    //     opts.path = opts.path || this._path
-
-    //     this.initEngine(srv, opts)
-
-    //     return this
-    // }
-    // /**
-    //  * Initialize engine
-    //  *
-    //  * @param srv - the server to attach to
-    //  * @param opts - options passed to engine.io
-    //  * @private
-    //  */
-    // private initEngine(srv: http.Server, opts: Partial<EngineAttachOptions>) {
-    //     // initialize engine
-    //     debug("creating engine.io instance with opts %j", opts)
-    //     this.eio = engine.attach(srv, opts)
-
-    //     // attach static file serving
-    //     if (this._serveClient) this.attachServe(srv)
-
-    //     // Export http server
-    //     this.httpServer = srv
-
-    //     // bind to engine events
-    //     this.bind(this.eio)
-    // }
-
-    // /**
-    //  * Attaches the static file serving.
-    //  *
-    //  * @param {Function|http.Server} srv http server
-    //  * @private
-    //  */
-    // private attachServe(srv) {
-    //     debug("attaching client serving req handler")
-
-    //     const evs = srv.listeners("request").slice(0)
-    //     srv.removeAllListeners("request")
-    //     srv.on("request", (req, res) => {
-    //         if (this.clientPathRegex.test(req.url)) {
-    //             this.serve(req, res)
-    //         } else {
-    //             for (let i = 0; i < evs.length; i++) {
-    //                 evs[i].call(srv, req, res)
-    //             }
-    //         }
-    //     })
-    // }
-    // /**
-    //  * Handles a request serving of client source and map
-    //  *
-    //  * @param {http.IncomingMessage} req
-    //  * @param {http.ServerResponse} res
-    //  * @private
-    //  */
-    // private serve(req: http.IncomingMessage, res: http.ServerResponse) {
-    //     const filename = req.url.replace(this._path, "")
-    //     const isMap = dotMapRegex.test(filename)
-    //     const type = isMap ? "map" : "source"
-
-    //     // Per the standard, ETags must be quoted:
-    //     // https://tools.ietf.org/html/rfc7232#section-2.3
-    //     const expectedEtag = '"' + clientVersion + '"'
-
-    //     const etag = req.headers["if-none-match"]
-    //     if (etag) {
-    //         if (expectedEtag == etag) {
-    //             debug("serve client %s 304", type)
-    //             res.writeHead(304)
-    //             res.end()
-    //             return
-    //         }
-    //     }
-
-    //     debug("serve client %s", type)
-
-    //     res.setHeader("Cache-Control", "public, max-age=0")
-    //     res.setHeader(
-    //         "Content-Type",
-    //         "application/" + (isMap ? "json" : "javascript")
-    //     )
-    //     res.setHeader("ETag", expectedEtag)
-
-    //     if (!isMap) {
-    //         res.setHeader("X-SourceMap", filename.substring(1) + ".map")
-    //     }
-    //     Server.sendFile(filename, req, res)
-    // }
-
-    // /**
-    //  * @param filename
-    //  * @param req
-    //  * @param res
-    //  * @private
-    //  */
-    // private static sendFile(
-    //     filename: string,
-    //     req: http.IncomingMessage,
-    //     res: http.ServerResponse
-    // ) {
-    //     const readStream = createReadStream(
-    //         path.join(__dirname, "../client-dist/", filename)
-    //     )
-    //     const encoding = accepts(req).encodings(["br", "gzip", "deflate"])
-
-    //     const onError = err => {
-    //         if (err) {
-    //             res.end()
-    //         }
-    //     }
-
-    //     switch (encoding) {
-    //         case "br":
-    //             res.writeHead(200, { "content-encoding": "br" })
-    //             readStream.pipe(createBrotliCompress()).pipe(res)
-    //             pipeline(readStream, createBrotliCompress(), res, onError)
-    //             break
-    //         case "gzip":
-    //             res.writeHead(200, { "content-encoding": "gzip" })
-    //             pipeline(readStream, createGzip(), res, onError)
-    //             break
-    //         case "deflate":
-    //             res.writeHead(200, { "content-encoding": "deflate" })
-    //             pipeline(readStream, createDeflate(), res, onError)
-    //             break
-    //         default:
-    //             res.writeHead(200)
-    //             pipeline(readStream, res, onError)
-    //     }
-    // }
-
-    // /**
-    //  * Binds socket.io to an engine.io instance.
-    //  *
-    //  * @param {engine.Server} engine engine.io (or compatible) server
-    //  * @return {Server} self
-    //  * @public
-    //  */
-    // public bind(engine): Server {
-    //     this.engine = engine
-    //     this.engine.on("connection", this.onconnection.bind(this))
-    //     return this
-    // }
-    /**
-     * Called with each incoming transport connection.
-     *
-     * @param {engine.Socket} conn
-     * @return {Server} self
-     * @private
-     */
-    private onconnection(conn): Server {
-        console.debug(`incoming connection with id ${conn.id}`)
-        let client = new Client(this, conn)
-        this.allClients.set(conn.id, client)
-        return this
-    }
-    // of(nsp: string): Namespace {
-    //     if (!this._nsps.has(nsp)) {
-    //         console.debug(`create Namespace ${nsp}`)
-    //         this._nsps.set(nsp, new Namespace(this, nsp))
-    //     }
-    //     return this._nsps.get(nsp)
-    // }
-    /**
-     * Looks up a namespace.
-     *
-     * @param {String|RegExp|Function} name nsp name
-     * @param {Function} [fn] optional, nsp `connection` ev handler
-     * @public
-     */
-    public of(
-        name:
-            | string
-            | RegExp
-            | ((
-                name: string,
-                query: object,
-                fn: (err: Error, success: boolean) => void
-            ) => void),
-        fn?: (socket: Socket) => void
-    ) {
-        if (typeof name === "function" || name instanceof RegExp) {
-            const parentNsp = new ParentNamespace(this)
-            console.debug(`initializing parent namespace ${parentNsp.name}`)
-            if (typeof name === "function") {
-                this.parentNsps.set(name, parentNsp)
-            } else {
-                this.parentNsps.set(
-                    (nsp, conn, next) => next(null, (name as RegExp).test(nsp)),
-                    parentNsp
-                )
-            }
-            if (fn) {
-                // @ts-ignore
-                parentNsp.on("connect", fn)
-            }
-            return parentNsp
-        }
-        if (String(name)[0] !== "/") name = "/" + name
-        let nsp = this._nsps.get(name)
-        if (!nsp) {
-            console.debug(`initializing namespace ${name}`)
-            nsp = new Namespace(this, name)
-            this._nsps.set(name, nsp)
-        }
-        if (fn) nsp.on("connect", fn)
-        return nsp
-    }
-    close(fn?: () => void): void {
-        this.clients.length
-        for (const client of this.allClients.values()) {
-            client._disconnect()
-        }
-
-        // this.engine.close()
-        this.websocketServer.close()
-
-        // if (this.httpServer) {
-        //     this.httpServer.close(fn)
-        // } else {
-        fn && fn()
-        // }
-    }
-    on(event: "connection", listener: (socket: Socket) => void): Namespace
-    on(event: "connect", listener: (socket: Socket) => void): Namespace
-    on(event: string, listener: Function): Namespace
-    on(event: any, listener: any): Namespace {
-        return this.sockets.on(event, listener)
-    }
-    to(room: string): Namespace {
-        return this.sockets.to(room)
-    }
-    in(room: string): Namespace {
-        return this.sockets.in(room)
-    }
-    use(fn: (socket: Socket, fn: (err?: any) => void) => void): Namespace {
-        return this.sockets.use(fn)
-    }
-    emit(event: string, ...args: any[]): Namespace {
-        // @ts-ignore
-        return this.sockets.emit(event, ...args)
-    }
-    send(...args: any[]): Namespace {
-        return this.sockets.send(...args)
-    }
-    write(...args: any[]): Namespace {
-        return this.sockets.write(...args)
-    }
-    clients(...args: any[]): Namespace {
-        return this.sockets.clients(args[0])
-    }
-    compress(...args: any[]): Namespace {
-        return this.sockets.compress(args[0])
-    }
-    // ===============================
-    private initServerConfig() {
-        this.allClients = new Map()
-        this._nsps = new Map()
-        this.connectTimeout(this.options.connectTimeout || 45000)
-        this._parser = this.options.parser || new Parser()
-        this.adapter(this.options.adapter || Adapter)
-    }
-    private selectServerImpl(instance: any) {
-        let WebSocketServerImpl = undefined
-        if (instance.class.name.startsWith('io.netty.channel')) {
-            WebSocketServerImpl = require("../netty").NettyWebSocketServer
-        } else {
-            WebSocketServerImpl = require("../tomcat").TomcatWebSocketServer
-        }
-        this.websocketServer = new WebSocketServerImpl(instance, this.options)
-    }
-    private initServer() {
-        this.websocketServer.on(ServerEvent.connect, (transport: Transport) => {
-            this.onconnection(transport)
-        })
-        this.websocketServer.on(ServerEvent.message, (transport: Transport, text) => {
-            if (this.allClients.has(transport.id)) {
-                let client = this.allClients.get(transport.id)
-                client.onPacket(this._parser.decode(text))
-            } else {
-                console.error(`unknow transport ${transport.id} reciver message ${text}`)
-            }
-        })
-        this.websocketServer.on(ServerEvent.disconnect, (transport: Transport, reason) => {
-            if (this.allClients.has(transport.id)) {
-                this.allClients.get(transport.id).onclose(reason)
-                this.allClients.delete(transport.id)
-            } else {
-                console.error(`unknow transport ${transport?.id} disconnect cause ${reason}`)
-            }
-        })
-        this.websocketServer.on(ServerEvent.error, (transport: Transport, cause) => {
-            if (this.allClients.has(transport?.id)) {
-                let client = this.allClients.get(transport?.id)
-                if (client.listeners(ServerEvent.error).length) {
-                    client.emit(ServerEvent.error, cause)
-                } else {
-                    console.error(`client ${client.id} cause error: ${cause}`)
-                    console.ex(cause)
-                }
-            } else {
-                console.error(`unknow transport ${transport?.id} cause error: ${cause}`)
-                console.ex(cause)
-            }
-        })
-    }
-}
-
-/**
- * Expose main namespace (/).
- */
-
-const emitterMethods = Object.keys(EventEmitter.prototype).filter(function (
-    key
-) {
-    return typeof EventEmitter.prototype[key] === "function"
-})
-
-emitterMethods.forEach(function (fn) {
-    Server.prototype[fn] = function () {
-        return this.sockets[fn].apply(this.sockets, arguments)
-    }
-})
-
-export {
-    Server,
-    Socket,
-    Client,
-    Namespace,
-    ServerOptions
-}
diff --git a/packages/websocket/src/socket-io/namespace.ts b/packages/websocket/src/socket-io/namespace.ts
deleted file mode 100644
index e6e6f59c..00000000
--- a/packages/websocket/src/socket-io/namespace.ts
+++ /dev/null
@@ -1,242 +0,0 @@
-import { EventEmitter } from 'events'
-
-import { Client } from './client'
-import { ServerEvent } from './constants'
-import { RESERVED_EVENTS, Socket } from './socket'
-import { Adapter, Room, SocketId } from './adapter'
-import { Server } from './index'
-import { Packet } from './packet'
-import { PacketTypes, SubPacketTypes } from './types'
-
-export interface ExtendedError extends Error {
-    data?: any
-}
-
-export class Namespace extends EventEmitter {
-    public readonly name: string
-    public readonly sockets: Map<SocketId, Socket>
-
-    public adapter: Adapter
-
-    /** @private */
-    readonly server: Server
-    json: Namespace
-
-    /** @private */
-    _fns: Array<
-        (socket: Socket, next: (err: ExtendedError) => void) => void
-    > = [];
-
-    /** @private */
-    _rooms: Set<Room>
-
-    /** @private */
-    _flags: any = {}
-
-    /** @private */
-    _ids: number = 0
-
-    constructor(server: Server, name: string) {
-        super()
-        this.server = server
-        this.name = name + ''
-        this._initAdapter()
-        // =======================
-        this.sockets = new Map()
-        this._rooms = new Set()
-    }
-    _initAdapter() {
-        // @ts-ignore
-        this.adapter = new (this.server.adapter())(this)
-    }
-    /**
-     * Sets up namespace middleware.
-     *
-     * @return {Namespace} self
-     * @public
-     */
-    public use(
-        fn: (socket: Socket, next: (err?: ExtendedError) => void) => void
-    ): Namespace {
-        this._fns.push(fn)
-        return this
-    }
-    /**
-     * Executes the middleware for an incoming client.
-     *
-     * @param {Socket} socket - the socket that will get added
-     * @param {Function} fn - last fn call in the middleware
-     * @private
-     */
-    private run(socket: Socket, fn: (err: ExtendedError) => void) {
-        const fns = this._fns.slice(0)
-        if (!fns.length) return fn(null)
-
-        function run(i) {
-            fns[i](socket, function (err) {
-                // upon error, short-circuit
-                if (err) return fn(err)
-
-                // if no middleware left, summon callback
-                if (!fns[i + 1]) return fn(null)
-
-                // go on to next
-                run(i + 1)
-            })
-        }
-
-        run(0)
-    }
-    to(name: string): Namespace {
-        this._rooms.add(name)
-        return this
-    }
-    in(name: string): Namespace {
-        return this.to(name)
-    }
-    _add(client: Client, query?: any, fn?: (socket: Socket) => void) {
-        const socket = new Socket(this, client, query || {})
-        console.debug(`client ${client.id} adding socket ${socket.id} to nsp ${this.name}`)
-        this.run(socket, err => {
-            process.nextTick(() => {
-                if ("open" == client.conn.readyState) {
-                    if (err)
-                        return socket._error({
-                            message: err.message,
-                            data: err.data
-                        })
-
-                    // track socket
-                    this.sockets.set(socket.id, socket)
-
-                    // it's paramount that the internal `onconnect` logic
-                    // fires before user-set events to prevent state order
-                    // violations (such as a disconnection before the connection
-                    // logic is complete)
-                    socket._onconnect()
-                    // !!! at java multi thread need direct callback socket
-                    if (fn) fn(socket)
-
-                    // fire user-set events
-                    super.emit(ServerEvent.connect, socket)
-                    super.emit(ServerEvent.connection, socket)
-                } else {
-                    console.debug(`next called after client ${client.id} was closed - ignoring socket`)
-                }
-            })
-        })
-        return socket
-    }
-    /**
-     * Removes a client. Called by each `Socket`.
-     *
-     * @private
-     */
-    _remove(socket: Socket): void {
-        if (this.sockets.has(socket.id)) {
-            console.debug(`namespace ${this.name} remove socket ${socket.id}`)
-            this.sockets.delete(socket.id)
-        } else {
-            console.debug(`namespace ${this.name} ignoring remove for ${socket.id}`)
-        }
-    }
-    emit(event: string, ...args: any[]): boolean {
-        if (RESERVED_EVENTS.has(event)) {
-            throw new Error(`"${event}" is a reserved event name`)
-        }
-        // set up packet object
-        var packet = {
-            type: PacketTypes.MESSAGE,
-            sub_type: (this._flags.binary !== undefined ? this._flags.binary : this.hasBin(args)) ? SubPacketTypes.BINARY_EVENT : SubPacketTypes.EVENT,
-            name: event,
-            data: args
-        }
-
-        if ('function' == typeof args[args.length - 1]) {
-            throw new Error('Callbacks are not supported when broadcasting')
-        }
-
-        var rooms = new Set(this._rooms)
-        var flags = Object.assign({}, this._flags)
-
-        // reset flags
-        this._rooms.clear()
-        this._flags = {}
-
-        this.adapter.broadcast(packet, {
-            rooms: new Set(rooms),
-            flags: flags
-        })
-        // @ts-ignore
-        return this
-    }
-    send(...args: any[]): Namespace {
-        this.emit('message', ...args)
-        return this
-    }
-    write(...args: any[]): Namespace {
-        return this.send(...args)
-    }
-    /**
-     * Gets a list of clients.
-     *
-     * @return {Namespace} self
-     * @public
-     */
-    public allSockets(): Promise<Set<SocketId>> {
-        if (!this.adapter) {
-            throw new Error("No adapter for this namespace, are you trying to get the list of clients of a dynamic namespace?")
-        }
-        const rooms = new Set(this._rooms)
-        this._rooms.clear()
-        return this.adapter.sockets(rooms)
-    }
-
-    /**
-     * Sets the compress flag.
-     *
-     * @param {Boolean} compress - if `true`, compresses the sending data
-     * @return {Namespace} self
-     * @public
-     */
-    public compress(compress: boolean): Namespace {
-        this._flags.compress = compress
-        return this
-    }
-
-    /**
-     * Sets a modifier for a subsequent event emission that the event data may be lost if the client is not ready to
-     * receive messages (because of network slowness or other issues, or because they’re connected through long polling
-     * and is in the middle of a request-response cycle).
-     *
-     * @return {Namespace} self
-     * @public
-     */
-    public get volatile(): Namespace {
-        this._flags.volatile = true
-        return this
-    }
-
-    /**
-     * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
-     *
-     * @return {Namespace} self
-     * @public
-     */
-    public get local(): Namespace {
-        this._flags.local = true
-        return this
-    }
-
-    hasBin(args: any[]) {
-        return false
-    }
-    clients(fn: (sockets: Socket[]) => Namespace): Namespace {
-        return fn(Object.values(this.sockets))
-    }
-    close() {
-        this.removeAllListeners(ServerEvent.connect)
-        this.removeAllListeners(ServerEvent.connection)
-        Object.values(this.sockets).forEach(socket => socket.disconnect(false))
-    }
-}
diff --git a/packages/websocket/src/socket-io/packet.ts b/packages/websocket/src/socket-io/packet.ts
deleted file mode 100644
index 1ce868b2..00000000
--- a/packages/websocket/src/socket-io/packet.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import { PacketTypes, SubPacketTypes } from './types'
-
-export interface Packet {
-    type: PacketTypes;
-    sub_type?: SubPacketTypes;
-    nsp?: string;
-    id?: number;
-    name?: string;
-    data?: any;
-    attachments?: any;
-}
diff --git a/packages/websocket/src/socket-io/parent-namespace.ts b/packages/websocket/src/socket-io/parent-namespace.ts
deleted file mode 100644
index 88e33d6d..00000000
--- a/packages/websocket/src/socket-io/parent-namespace.ts
+++ /dev/null
@@ -1,40 +0,0 @@
-import { Namespace } from "./namespace"
-
-export class ParentNamespace extends Namespace {
-    private static count: number = 0;
-    private children: Set<Namespace> = new Set();
-
-    constructor(server) {
-        super(server, "/_" + ParentNamespace.count++)
-    }
-
-    _initAdapter() { }
-
-    public emit(...args: any[]): boolean {
-        this.children.forEach(nsp => {
-            nsp._rooms = this._rooms
-            nsp._flags = this._flags
-            nsp.emit.apply(nsp, args as any)
-        })
-        this._rooms.clear()
-        this._flags = {}
-
-        return true
-    }
-
-    createChild(name) {
-        const namespace = new Namespace(this.server, name)
-        namespace._fns = this._fns.slice(0)
-        this.listeners("connect").forEach(listener =>
-            // @ts-ignore
-            namespace.on("connect", listener)
-        )
-        this.listeners("connection").forEach(listener =>
-            // @ts-ignore
-            namespace.on("connection", listener)
-        )
-        this.children.add(namespace)
-        this.server._nsps.set(name, namespace)
-        return namespace
-    }
-}
diff --git a/packages/websocket/src/socket-io/parser.ts b/packages/websocket/src/socket-io/parser.ts
deleted file mode 100644
index c86308ac..00000000
--- a/packages/websocket/src/socket-io/parser.ts
+++ /dev/null
@@ -1,164 +0,0 @@
-import { EventEmitter } from 'events'
-import { Packet } from "./packet"
-import { PacketTypes, SubPacketTypes } from "./types"
-
-export class Parser extends EventEmitter {
-    encode(packet: Packet): string {
-        let origin = JSON.stringify(packet)
-        // first is type
-        let str = '' + packet.type
-        if (packet.type == PacketTypes.PONG) {
-            if (packet.data) { str += packet.data };
-            return str
-        }
-        if (packet.sub_type != undefined) {
-            str += packet.sub_type
-        }
-        // attachments if we have them
-        if ([SubPacketTypes.BINARY_EVENT, SubPacketTypes.BINARY_ACK].includes(packet.sub_type)) {
-            str += packet.attachments + '-'
-        }
-        // if we have a namespace other than `/`
-        // we append it followed by a comma `,`
-        if (packet.nsp && '/' !== packet.nsp) {
-            str += packet.nsp + ','
-        }
-        // immediately followed by the id
-        if (null != packet.id) {
-            str += packet.id
-        }
-        if (packet.sub_type == SubPacketTypes.EVENT) {
-            if (packet.name == undefined) { throw new Error(`SubPacketTypes.EVENT name can't be empty!`) }
-            packet.data = [packet.name, ...packet.data]
-        }
-        // json data
-        if (null != packet.data) {
-            let payload = this.tryStringify(packet.data)
-            if (payload !== false) {
-                str += payload
-            } else {
-                return '4"encode error"'
-            }
-        }
-        console.trace(`encoded ${origin} as ${str}`)
-        return str
-    }
-    tryStringify(str: any) {
-        try {
-            return JSON.stringify(str)
-        } catch (e) {
-            return false
-        }
-    }
-    decode(str: string): Packet {
-        let i = 0
-        // ignore parse binary
-        // if ((frame.getByte(0) == 'b' && frame.getByte(1) == '4')
-        //     || frame.getByte(0) == 4 || frame.getByte(0) == 1) {
-        //     return parseBinary(head, frame);
-        // }
-        // look up type
-        let p: Packet = {
-            type: Number(str.charAt(i))
-        }
-        if (null == PacketTypes[p.type]) {
-            return this.error('unknown packet type ' + p.type)
-        }
-        // if str empty return
-        if (str.length == i + 1) {
-            return p
-        }
-        // if is ping packet read data and return
-        if (PacketTypes.PING == p.type) {
-            p.data = str.substr(++i)
-            return p
-        }
-        // look up sub type
-        p.sub_type = Number(str.charAt(++i))
-        if (null == PacketTypes[p.sub_type]) {
-            return this.error('unknown sub packet type ' + p.type)
-        }
-        // look up attachments if type binary
-        if ([SubPacketTypes.BINARY_ACK, SubPacketTypes.BINARY_EVENT].includes(p.sub_type)) {
-            let buf = ''
-            while (str.charAt(++i) !== '-') {
-                buf += str.charAt(i)
-                if (i == str.length) break
-            }
-            if (buf != `${Number(buf)}` || str.charAt(i) !== '-') {
-                return this.error('Illegal attachments')
-            }
-            p.attachments = Number(buf)
-        }
-
-        // look up namespace (if any)
-        if ('/' === str.charAt(i + 1)) {
-            p.nsp = ''
-            while (++i) {
-                let c = str.charAt(i)
-                if (',' === c) break
-                p.nsp += c
-                if (i === str.length) break
-            }
-        } else {
-            p.nsp = '/'
-        }
-
-        // handle namespace query
-        if (p.nsp.indexOf('?') !== -1) {
-            p.nsp = p.nsp.split('?')[0]
-        }
-
-        // look up id
-        let next = str.charAt(i + 1)
-        if ('' !== next && !isNaN(Number(next))) {
-            let id = ''
-            while (++i) {
-                let c = str.charAt(i)
-                if (null == c || isNaN(Number(c))) {
-                    --i
-                    break
-                }
-                id += str.charAt(i)
-                if (i === str.length) break
-            }
-            p.id = Number(id)
-        }
-
-        // ignore binary packet
-        if (p.sub_type == SubPacketTypes.BINARY_EVENT) {
-            return this.error('not support binary parse...')
-        }
-
-        // look up json data
-        if (str.charAt(++i)) {
-            let payload = this.tryParse(str.substr(i))
-            let isPayloadValid = payload !== false && (p.sub_type == SubPacketTypes.ERROR || Array.isArray(payload))
-            if (isPayloadValid) {
-                p.name = payload[0]
-                p.data = payload.slice(1)
-            } else {
-                return this.error('invalid payload ' + str.substr(i))
-            }
-        }
-
-        console.trace(`decoded ${str} as ${JSON.stringify(p)}`)
-        return p
-    }
-
-    tryParse(str: string) {
-        try {
-            return JSON.parse(str)
-        } catch (e) {
-            return false
-        }
-    }
-
-    error(error: string): Packet {
-        return {
-            type: PacketTypes.MESSAGE,
-            sub_type: SubPacketTypes.ERROR,
-            data: 'parser error: ' + error
-        }
-    }
-}
diff --git a/packages/websocket/src/socket-io/socket.ts b/packages/websocket/src/socket-io/socket.ts
deleted file mode 100644
index dd085c93..00000000
--- a/packages/websocket/src/socket-io/socket.ts
+++ /dev/null
@@ -1,491 +0,0 @@
-import { EventEmitter } from 'events'
-
-import { Packet } from './packet'
-import { PacketTypes, SubPacketTypes } from './types'
-import { Client } from './client'
-import { Namespace } from './namespace'
-import * as querystring from 'querystring'
-import { ServerEvent } from './constants'
-import { Adapter, BroadcastFlags, Room, SocketId } from './adapter'
-import { Server } from 'index'
-
-export const RESERVED_EVENTS = new Set([
-    "connect",
-    "connect_error",
-    "disconnect",
-    "disconnecting",
-    // EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
-    "newListener",
-    "removeListener"
-])
-
-/**
- * The handshake details
- */
-export interface Handshake {
-    /**
-     * The headers sent as part of the handshake
-     */
-    headers: object
-
-    /**
-     * The date of creation (as string)
-     */
-    time: string
-
-    /**
-     * The ip of the client
-     */
-    address: string
-
-    /**
-     * Whether the connection is cross-domain
-     */
-    xdomain: boolean
-
-    /**
-     * Whether the connection is secure
-     */
-    secure: boolean
-
-    /**
-     * The date of creation (as unix timestamp)
-     */
-    issued: number
-
-    /**
-     * The request URL string
-     */
-    url: string
-
-    /**
-     * The query object
-     */
-    query: any
-
-    /**
-     * The auth object
-     */
-    auth: any
-}
-export class Socket extends EventEmitter {
-    nsp: Namespace
-
-    public readonly id: SocketId
-    public readonly handshake: Handshake
-
-    public connected: boolean
-    public disconnected: boolean
-
-    private readonly server: Server
-    private readonly adapter: Adapter
-
-    client: Client
-    private acks: Map<number, () => void>
-
-    fns: any[]
-    private flags: BroadcastFlags = {};
-    private _rooms: Set<Room> = new Set();
-    private _anyListeners: Array<(...args: any[]) => void>
-
-    constructor(nsp: Namespace, client: Client, auth = {}) {
-        super()
-        this.nsp = nsp
-        this.server = nsp.server
-        this.adapter = this.nsp.adapter
-        this.id = nsp.name !== '/' ? nsp.name + '#' + client.id : client.id
-        this.client = client
-        this.acks = new Map()
-        this.connected = true
-        this.disconnected = false
-        this.handshake = this.buildHandshake(auth)
-
-        this.fns = []
-        this.flags = {}
-        this._rooms = new Set()
-    }
-    emit(event: string, ...args: any[]): boolean {
-        let packet: Packet = {
-            type: PacketTypes.MESSAGE,
-            sub_type: (this.flags.binary !== undefined ? this.flags.binary : this.hasBin(args)) ? SubPacketTypes.BINARY_EVENT : SubPacketTypes.EVENT,
-            name: event,
-            data: args
-        }
-
-        // access last argument to see if it's an ACK callback
-        if (typeof args[args.length - 1] === "function") {
-            if (this._rooms.size || this.flags.broadcast) {
-                throw new Error("Callbacks are not supported when broadcasting")
-            }
-
-            // console.debug("emitting packet with ack id %d", this.nsp._ids)
-            this.acks.set(this.nsp._ids, args.pop())
-            packet.id = this.nsp._ids++
-        }
-
-        const rooms = new Set(this._rooms)
-        const flags = Object.assign({}, this.flags)
-
-        // reset flags
-        this._rooms.clear()
-        this.flags = {}
-
-        if (rooms.size || flags.broadcast) {
-            this.adapter.broadcast(packet, {
-                except: new Set([this.id]),
-                rooms: rooms,
-                flags: flags
-            })
-        } else {
-            // dispatch packet
-            this.packet(packet, flags)
-        }
-        return true
-    }
-    to(name: Room): Socket {
-        this._rooms.add(name)
-        return this
-    }
-    in(room: string): Socket {
-        return this.to(room)
-    }
-    use(fn: (packet: Packet, next: (err?: any) => void) => void): Socket {
-        throw new Error("Method not implemented.")
-    }
-    send(...args: any[]): Socket {
-        this.emit("message", ...args)
-        return this
-    }
-    write(...args: any[]): Socket {
-        return this.send(...args)
-    }
-    public join(rooms: Room | Array<Room>): Promise<void> | void {
-        console.debug(`join room ${rooms}`)
-
-        return this.adapter.addAll(
-            this.id,
-            new Set(Array.isArray(rooms) ? rooms : [rooms])
-        )
-    }
-    /**
-     * Leaves a room.
-     *
-     * @param {String} room
-     * @return a Promise or nothing, depending on the adapter
-     * @public
-     */
-    public leave(room: string): Promise<void> | void {
-        console.debug(`leave room ${room}`)
-
-        return this.adapter.del(this.id, room)
-    }
-
-    /**
-     * Leave all rooms.
-     *
-     * @private
-     */
-    private leaveAll(): void {
-        this.adapter.delAll(this.id)
-    }
-
-    /**
-      * Called by `Namespace` upon successful
-      * middleware execution (ie: authorization).
-      * Socket is added to namespace array before
-      * call to join, so adapters can access it.
-      *
-      * @private
-      */
-    _onconnect(): void {
-        console.debug(`socket ${this.id} connected - writing packet`)
-        this.join(this.id)
-        this.packet({ type: PacketTypes.MESSAGE, sub_type: SubPacketTypes.CONNECT, data: { sid: this.id } })
-    }
-    _onpacket(packet: Packet) {
-        switch (packet.sub_type) {
-            // 2
-            case SubPacketTypes.EVENT:
-                this.onevent(packet)
-                break
-            // 5
-            case SubPacketTypes.BINARY_EVENT:
-                this.onevent(packet)
-                break
-            // 3
-            case SubPacketTypes.ACK:
-                this.onack(packet)
-                break
-            // 6
-            case SubPacketTypes.BINARY_ACK:
-                this.onack(packet)
-                break
-            // 1
-            case SubPacketTypes.DISCONNECT:
-                this.ondisconnect()
-                break
-            // 4
-            case SubPacketTypes.ERROR:
-                this._onerror(new Error(packet.data))
-        }
-    }
-    onevent(packet: Packet) {
-        if (null != packet.id) {
-            console.trace(`attaching ack ${packet.id} callback to client ${this.id} event`)
-            this.dispatch(packet, this.ack(packet.id))
-        } else {
-            this.dispatch(packet)
-        }
-    }
-    ack(id: number) {
-        let sent = false
-        return (...args: any[]) => {
-            if (sent) return
-            this.packet({
-                id: id,
-                type: PacketTypes.MESSAGE,
-                sub_type: this.hasBin(args) ? SubPacketTypes.BINARY_ACK : SubPacketTypes.ACK,
-                data: args
-            })
-            sent = true
-        }
-    }
-    onack(packet: Packet) {
-        let ack = this.acks.get(packet.id)
-        if ('function' == typeof ack) {
-            console.trace(`calling ack ${packet.id} on socket ${this.id} with ${packet.data}`)
-            ack.apply(this, packet.data)
-            this.acks.delete(packet.id)
-        } else {
-            console.trace(`bad ack ${packet.id} on socket ${this.id}`)
-        }
-    }
-    /**
-     * Called upon client disconnect packet.
-     *
-     * @private
-     */
-    private ondisconnect(): void {
-        console.debug(`socket ${this.id} got disconnect packet`)
-        this._onclose("client namespace disconnect")
-    }
-
-    /**
-     * Handles a client error.
-     *
-     * @private
-     */
-    _onerror(err): void {
-        if (this.listeners("error").length) {
-            super.emit("error", err)
-        } else {
-            console.error(`Missing error handler on 'socket(${this.id})'.`)
-            console.error(err.stack)
-        }
-    }
-
-    /**
-     * Called upon closing. Called by `Client`.
-     *
-     * @param {String} reason
-     * @throw {Error} optional error object
-     *
-     * @private
-     */
-    _onclose(reason: string) {
-        if (!this.connected) return this
-        console.debug(`closing socket ${this.id} - reason: ${reason} connected: ${this.connected}`)
-        super.emit(ServerEvent.disconnecting, reason)
-        this.leaveAll()
-        this.nsp._remove(this)
-        this.client._remove(this)
-        this.connected = false
-        this.disconnected = true
-        super.emit(ServerEvent.disconnect, reason)
-    }
-
-    /**
-     * Produces an `error` packet.
-     *
-     * @param {Object} err - error object
-     *
-     * @private
-     */
-    _error(err) {
-        this.packet({ type: PacketTypes.MESSAGE, sub_type: SubPacketTypes.ERROR, data: err })
-    }
-    disconnect(close?: boolean): Socket {
-        if (!this.connected) return this
-        if (close) {
-            this.client._disconnect()
-        } else {
-            this.packet({ type: PacketTypes.MESSAGE, sub_type: SubPacketTypes.DISCONNECT })
-            this._onclose('server namespace disconnect')
-        }
-        return this
-    }
-
-    compress(compress: boolean): Socket {
-        throw new Error("Method not implemented.")
-    }
-
-    /**
-    * Sets a modifier for a subsequent event emission that the event data may be lost if the client is not ready to
-    * receive messages (because of network slowness or other issues, or because they’re connected through long polling
-    * and is in the middle of a request-response cycle).
-    *
-    * @return {Socket} self
-    * @public
-    */
-    public get volatile(): Socket {
-        this.flags.volatile = true
-        return this
-    }
-
-    /**
-     * Sets a modifier for a subsequent event emission that the event data will only be broadcast to every sockets but the
-     * sender.
-     *
-     * @return {Socket} self
-     * @public
-     */
-    public get broadcast(): Socket {
-        this.flags.broadcast = true
-        return this
-    }
-
-    /**
-     * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
-     *
-     * @return {Socket} self
-     * @public
-     */
-    public get local(): Socket {
-        this.flags.local = true
-        return this
-    }
-
-    /**
-     * A reference to the request that originated the underlying Engine.IO Socket.
-     *
-     * @public
-     */
-    public get request(): any {
-        return this.client.request
-    }
-
-    /**
-     * A reference to the underlying Client transport connection (Engine.IO Socket object).
-     *
-     * @public
-     */
-    public get conn() {
-        return this.client.conn
-    }
-
-    /**
-     * @public
-     */
-    public get rooms(): Set<Room> {
-        return this.adapter.socketRooms(this.id) || new Set()
-    }
-
-    /**
-     * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
-     * callback.
-     *
-     * @param listener
-     * @public
-     */
-    public onAny(listener: (...args: any[]) => void): Socket {
-        this._anyListeners = this._anyListeners || []
-        this._anyListeners.push(listener)
-        return this
-    }
-
-    /**
-     * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
-     * callback. The listener is added to the beginning of the listeners array.
-     *
-     * @param listener
-     * @public
-     */
-    public prependAny(listener: (...args: any[]) => void): Socket {
-        this._anyListeners = this._anyListeners || []
-        this._anyListeners.unshift(listener)
-        return this
-    }
-
-    /**
-     * Removes the listener that will be fired when any event is emitted.
-     *
-     * @param listener
-     * @public
-     */
-    public offAny(listener?: (...args: any[]) => void): Socket {
-        if (!this._anyListeners) {
-            return this
-        }
-        if (listener) {
-            const listeners = this._anyListeners
-            for (let i = 0; i < listeners.length; i++) {
-                if (listener === listeners[i]) {
-                    listeners.splice(i, 1)
-                    return this
-                }
-            }
-        } else {
-            this._anyListeners = []
-        }
-        return this
-    }
-
-    /**
-     * Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,
-     * e.g. to remove listeners.
-     *
-     * @public
-     */
-    public listenersAny() {
-        return this._anyListeners || []
-    }
-
-    // ==========================================
-    buildHandshake(auth): Handshake {
-        let requestUri = this.request.uri()
-        let headers = {}
-        let nativeHeaders = this.request.headers()
-        nativeHeaders.forEach(function (header) {
-            headers[header.getKey()] = header.getValue()
-        })
-        return {
-            headers: headers,
-            time: new Date() + '',
-            address: this.conn.remoteAddress + '',
-            xdomain: !!headers['origin'],
-            secure: false,
-            issued: +new Date(),
-            url: requestUri,
-            query: querystring.parse(requestUri.indexOf('?') != -1 ? requestUri.split('?')[1] : ''),
-            auth
-        }
-    }
-    packet(packet: Packet, opts: any = { preEncoded: false }) {
-        if (!opts.preEncoded) {
-            packet.nsp = this.nsp.name
-            opts.compress = false !== opts.compress
-        }
-        try {
-            this.client._packet(packet, opts)
-        } catch (error) {
-            this._onerror(error)
-        }
-    }
-    dispatch(packet: Packet, ack?: () => void) {
-        if (ack) { this.acks.set(packet.id, ack) }
-        super.emit(packet.name, ...packet.data, ack)
-    }
-    private hasBin(obj: any) {
-        return false
-    }
-}
diff --git a/packages/websocket/src/socket-io/types.ts b/packages/websocket/src/socket-io/types.ts
deleted file mode 100644
index 39758563..00000000
--- a/packages/websocket/src/socket-io/types.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-export enum PacketTypes {
-    OPEN,
-    CLOSE,
-    PING,
-    PONG,
-    MESSAGE,
-    UPGRADE,
-    NOOP,
-}
-export enum SubPacketTypes {
-    CONNECT,
-    DISCONNECT,
-    EVENT,
-    ACK,
-    ERROR,
-    BINARY_EVENT,
-    BINARY_ACK
-}
diff --git a/packages/websocket/src/socket.io-adapter/index.ts b/packages/websocket/src/socket.io-adapter/index.ts
new file mode 100644
index 00000000..fdee138c
--- /dev/null
+++ b/packages/websocket/src/socket.io-adapter/index.ts
@@ -0,0 +1,279 @@
+import { EventEmitter } from "events"
+
+export type SocketId = string
+export type Room = string
+
+export interface BroadcastFlags {
+    volatile?: boolean
+    compress?: boolean
+    local?: boolean
+    broadcast?: boolean
+    binary?: boolean
+}
+
+export interface BroadcastOptions {
+    rooms: Set<Room>
+    except?: Set<SocketId>
+    flags?: BroadcastFlags
+}
+
+export class Adapter extends EventEmitter {
+    public rooms: Map<Room, Set<SocketId>> = new Map();
+    public sids: Map<SocketId, Set<Room>> = new Map();
+    private readonly encoder
+
+    /**
+     * In-memory adapter constructor.
+     *
+     * @param {Namespace} nsp
+     */
+    constructor(readonly nsp: any) {
+        super()
+        this.encoder = nsp.server.encoder
+    }
+
+    /**
+     * To be overridden
+     */
+    public init(): Promise<void> | void { }
+
+    /**
+     * To be overridden
+     */
+    public close(): Promise<void> | void { }
+
+    /**
+     * Adds a socket to a list of room.
+     *
+     * @param {SocketId}  id      the socket id
+     * @param {Set<Room>} rooms   a set of rooms
+     * @public
+     */
+    public addAll(id: SocketId, rooms: Set<Room>): Promise<void> | void {
+        if (!this.sids.has(id)) {
+            this.sids.set(id, new Set())
+        }
+
+        for (const room of rooms) {
+            this.sids.get(id).add(room)
+
+            if (!this.rooms.has(room)) {
+                this.rooms.set(room, new Set())
+                this.emit("create-room", room)
+            }
+            if (!this.rooms.get(room).has(id)) {
+                this.rooms.get(room).add(id)
+                this.emit("join-room", room, id)
+            }
+        }
+    }
+
+    /**
+     * Removes a socket from a room.
+     *
+     * @param {SocketId} id     the socket id
+     * @param {Room}     room   the room name
+     */
+    public del(id: SocketId, room: Room): Promise<void> | void {
+        if (this.sids.has(id)) {
+            this.sids.get(id).delete(room)
+        }
+
+        this._del(room, id)
+    }
+
+    private _del(room, id) {
+        if (this.rooms.has(room)) {
+            const deleted = this.rooms.get(room).delete(id)
+            if (deleted) {
+                this.emit("leave-room", room, id)
+            }
+            if (this.rooms.get(room).size === 0) {
+                this.rooms.delete(room)
+                this.emit("delete-room", room)
+            }
+        }
+    }
+
+    /**
+     * Removes a socket from all rooms it's joined.
+     *
+     * @param {SocketId} id   the socket id
+     */
+    public delAll(id: SocketId): void {
+        if (!this.sids.has(id)) {
+            return
+        }
+
+        for (const room of this.sids.get(id)) {
+            this._del(room, id)
+        }
+
+        this.sids.delete(id)
+    }
+
+    /**
+     * Broadcasts a packet.
+     *
+     * Options:
+     *  - `flags` {Object} flags for this packet
+     *  - `except` {Array} sids that should be excluded
+     *  - `rooms` {Array} list of rooms to broadcast to
+     *
+     * @param {Object} packet   the packet object
+     * @param {Object} opts     the options
+     * @public
+     */
+    public broadcast(packet: any, opts: BroadcastOptions): void {
+        const flags = opts.flags || {}
+        const basePacketOpts = {
+            preEncoded: true,
+            volatile: flags.volatile,
+            compress: flags.compress
+        }
+
+        packet.nsp = this.nsp.name
+        const encodedPackets = this.encoder.encode(packet)
+
+        const packetOpts = encodedPackets.map(encodedPacket => {
+            if (typeof encodedPacket === "string") {
+                return {
+                    ...basePacketOpts,
+                    wsPreEncoded: "4" + encodedPacket // "4" being the "message" packet type in Engine.IO
+                }
+            } else {
+                return basePacketOpts
+            }
+        })
+
+        this.apply(opts, socket => {
+            for (let i = 0; i < encodedPackets.length; i++) {
+                socket.client.writeToEngine(encodedPackets[i], packetOpts[i])
+            }
+        })
+    }
+
+    /**
+     * Gets a list of sockets by sid.
+     *
+     * @param {Set<Room>} rooms   the explicit set of rooms to check.
+     */
+    public sockets(rooms: Set<Room>): Promise<Set<SocketId>> {
+        const sids = new Set<SocketId>()
+
+        this.apply({ rooms }, socket => {
+            sids.add(socket.id)
+        })
+
+        return Promise.resolve(sids)
+    }
+
+    /**
+     * Gets the list of rooms a given socket has joined.
+     *
+     * @param {SocketId} id   the socket id
+     */
+    public socketRooms(id: SocketId): Set<Room> | undefined {
+        return this.sids.get(id)
+    }
+
+    /**
+     * Returns the matching socket instances
+     *
+     * @param opts - the filters to apply
+     */
+    public fetchSockets(opts: BroadcastOptions): Promise<any[]> {
+        const sockets = []
+
+        this.apply(opts, socket => {
+            sockets.push(socket)
+        })
+
+        return Promise.resolve(sockets)
+    }
+
+    /**
+     * Makes the matching socket instances join the specified rooms
+     *
+     * @param opts - the filters to apply
+     * @param rooms - the rooms to join
+     */
+    public addSockets(opts: BroadcastOptions, rooms: Room[]): void {
+        this.apply(opts, socket => {
+            socket.join(rooms)
+        })
+    }
+
+    /**
+     * Makes the matching socket instances leave the specified rooms
+     *
+     * @param opts - the filters to apply
+     * @param rooms - the rooms to leave
+     */
+    public delSockets(opts: BroadcastOptions, rooms: Room[]): void {
+        this.apply(opts, socket => {
+            rooms.forEach(room => socket.leave(room))
+        })
+    }
+
+    /**
+     * Makes the matching socket instances disconnect
+     *
+     * @param opts - the filters to apply
+     * @param close - whether to close the underlying connection
+     */
+    public disconnectSockets(opts: BroadcastOptions, close: boolean): void {
+        this.apply(opts, socket => {
+            socket.disconnect(close)
+        })
+    }
+
+    private apply(opts: BroadcastOptions, callback: (socket) => void): void {
+        const rooms = opts.rooms
+        const except = this.computeExceptSids(opts.except)
+
+        if (rooms.size) {
+            const ids = new Set()
+            for (const room of rooms) {
+                if (!this.rooms.has(room)) continue
+
+                for (const id of this.rooms.get(room)) {
+                    if (ids.has(id) || except.has(id)) continue
+                    const socket = this.nsp.sockets.get(id)
+                    if (socket) {
+                        callback(socket)
+                        ids.add(id)
+                    }
+                }
+            }
+        } else {
+            for (const [id] of this.sids) {
+                if (except.has(id)) continue
+                const socket = this.nsp.sockets.get(id)
+                if (socket) callback(socket)
+            }
+        }
+    }
+
+    private computeExceptSids(exceptRooms?: Set<Room>) {
+        const exceptSids = new Set()
+        if (exceptRooms && exceptRooms.size > 0) {
+            for (const room of exceptRooms) {
+                if (this.rooms.has(room)) {
+                    this.rooms.get(room).forEach(sid => exceptSids.add(sid))
+                }
+            }
+        }
+        return exceptSids
+    }
+
+    /**
+     * Send a packet to the other Socket.IO servers in the cluster
+     * @param packet - an array of arguments, which may include an acknowledgement callback at the end
+     */
+    public serverSideEmit(packet: any[]): void {
+        throw new Error(
+            "this adapter does not support the serverSideEmit() functionality"
+        )
+    }
+}
diff --git a/packages/websocket/src/socket.io-parser/binary.ts b/packages/websocket/src/socket.io-parser/binary.ts
new file mode 100644
index 00000000..dd02b685
--- /dev/null
+++ b/packages/websocket/src/socket.io-parser/binary.ts
@@ -0,0 +1,78 @@
+import { isBinary } from "./is-binary"
+
+/**
+ * Replaces every Buffer | ArrayBuffer | Blob | File in packet with a numbered placeholder.
+ *
+ * @param {Object} packet - socket.io event packet
+ * @return {Object} with deconstructed packet and list of buffers
+ * @public
+ */
+
+export function deconstructPacket(packet) {
+    const buffers = []
+    const packetData = packet.data
+    const pack = packet
+    pack.data = _deconstructPacket(packetData, buffers)
+    pack.attachments = buffers.length // number of binary 'attachments'
+    return { packet: pack, buffers: buffers }
+}
+
+function _deconstructPacket(data, buffers) {
+    if (!data) return data
+
+    if (isBinary(data)) {
+        const placeholder = { _placeholder: true, num: buffers.length }
+        buffers.push(data)
+        return placeholder
+    } else if (Array.isArray(data)) {
+        const newData = new Array(data.length)
+        for (let i = 0; i < data.length; i++) {
+            newData[i] = _deconstructPacket(data[i], buffers)
+        }
+        return newData
+    } else if (typeof data === "object" && !(data instanceof Date)) {
+        const newData = {}
+        for (const key in data) {
+            if (data.hasOwnProperty(key)) {
+                newData[key] = _deconstructPacket(data[key], buffers)
+            }
+        }
+        return newData
+    }
+    return data
+}
+
+/**
+ * Reconstructs a binary packet from its placeholder packet and buffers
+ *
+ * @param {Object} packet - event packet with placeholders
+ * @param {Array} buffers - binary buffers to put in placeholder positions
+ * @return {Object} reconstructed packet
+ * @public
+ */
+
+export function reconstructPacket(packet, buffers) {
+    packet.data = _reconstructPacket(packet.data, buffers)
+    packet.attachments = undefined // no longer useful
+    return packet
+}
+
+function _reconstructPacket(data, buffers) {
+    if (!data) return data
+
+    if (data && data._placeholder) {
+        return buffers[data.num] // appropriate buffer (should be natural order anyway)
+    } else if (Array.isArray(data)) {
+        for (let i = 0; i < data.length; i++) {
+            data[i] = _reconstructPacket(data[i], buffers)
+        }
+    } else if (typeof data === "object") {
+        for (const key in data) {
+            if (data.hasOwnProperty(key)) {
+                data[key] = _reconstructPacket(data[key], buffers)
+            }
+        }
+    }
+
+    return data
+}
diff --git a/packages/websocket/src/socket.io-parser/index.ts b/packages/websocket/src/socket.io-parser/index.ts
new file mode 100644
index 00000000..02811751
--- /dev/null
+++ b/packages/websocket/src/socket.io-parser/index.ts
@@ -0,0 +1,316 @@
+import EventEmitter = require("events")
+import { deconstructPacket, reconstructPacket } from "./binary"
+import { isBinary, hasBinary } from "./is-binary"
+
+// const debug = require("debug")("socket.io-parser")
+
+/**
+ * Protocol version.
+ *
+ * @public
+ */
+
+export const protocol: number = 5
+
+export enum PacketType {
+    CONNECT,
+    DISCONNECT,
+    EVENT,
+    ACK,
+    CONNECT_ERROR,
+    BINARY_EVENT,
+    BINARY_ACK,
+}
+
+export interface Packet {
+    type: PacketType
+    nsp: string
+    data?: any
+    id?: number
+    attachments?: number
+}
+
+/**
+ * A socket.io Encoder instance
+ */
+
+export class Encoder {
+    /**
+     * Encode a packet as a single string if non-binary, or as a
+     * buffer sequence, depending on packet type.
+     *
+     * @param {Object} obj - packet object
+     */
+    public encode(obj: Packet) {
+        console.trace("encoding packet", JSON.stringify(obj))
+
+        if (obj.type === PacketType.EVENT || obj.type === PacketType.ACK) {
+            if (hasBinary(obj)) {
+                obj.type =
+                    obj.type === PacketType.EVENT
+                        ? PacketType.BINARY_EVENT
+                        : PacketType.BINARY_ACK
+                return this.encodeAsBinary(obj)
+            }
+        }
+        return [this.encodeAsString(obj)]
+    }
+
+    /**
+     * Encode packet as string.
+     */
+
+    private encodeAsString(obj: Packet) {
+        // first is type
+        let str = "" + obj.type
+
+        // attachments if we have them
+        if (
+            obj.type === PacketType.BINARY_EVENT ||
+            obj.type === PacketType.BINARY_ACK
+        ) {
+            str += obj.attachments + "-"
+        }
+
+        // if we have a namespace other than `/`
+        // we append it followed by a comma `,`
+        if (obj.nsp && "/" !== obj.nsp) {
+            str += obj.nsp + ","
+        }
+
+        // immediately followed by the id
+        if (null != obj.id) {
+            str += obj.id
+        }
+
+        // json data
+        if (null != obj.data) {
+            str += JSON.stringify(obj.data)
+        }
+
+        console.trace("encoded", JSON.stringify(obj), "as", str)
+        return str
+    }
+
+    /**
+     * Encode packet as 'buffer sequence' by removing blobs, and
+     * deconstructing packet into object with placeholders and
+     * a list of buffers.
+     */
+
+    private encodeAsBinary(obj: Packet) {
+        const deconstruction = deconstructPacket(obj)
+        const pack = this.encodeAsString(deconstruction.packet)
+        const buffers = deconstruction.buffers
+
+        buffers.unshift(pack) // add packet info to beginning of data list
+        return buffers // write all the buffers
+    }
+}
+
+/**
+ * A socket.io Decoder instance
+ *
+ * @return {Object} decoder
+ */
+export class Decoder extends EventEmitter {
+    private reconstructor: BinaryReconstructor
+
+    constructor() {
+        super()
+    }
+
+    /**
+     * Decodes an encoded packet string into packet JSON.
+     *
+     * @param {String} obj - encoded packet
+     */
+
+    public add(obj: any) {
+        let packet
+        if (typeof obj === "string") {
+            packet = this.decodeString(obj)
+            if (
+                packet.type === PacketType.BINARY_EVENT ||
+                packet.type === PacketType.BINARY_ACK
+            ) {
+                // binary packet's json
+                this.reconstructor = new BinaryReconstructor(packet)
+
+                // no attachments, labeled binary but no binary data to follow
+                if (packet.attachments === 0) {
+                    super.emit("decoded", packet)
+                }
+            } else {
+                // non-binary full packet
+                super.emit("decoded", packet)
+            }
+        } else if (isBinary(obj) || obj.base64) {
+            // raw binary data
+            if (!this.reconstructor) {
+                throw new Error("got binary data when not reconstructing a packet")
+            } else {
+                packet = this.reconstructor.takeBinaryData(obj)
+                if (packet) {
+                    // received final buffer
+                    this.reconstructor = null
+                    super.emit("decoded", packet)
+                }
+            }
+        } else {
+            throw new Error("Unknown type: " + obj)
+        }
+    }
+
+    /**
+     * Decode a packet String (JSON data)
+     *
+     * @param {String} str
+     * @return {Object} packet
+     */
+    private decodeString(str): Packet {
+        let i = 0
+        // look up type
+        const p: any = {
+            type: Number(str.charAt(0)),
+        }
+
+        if (PacketType[p.type] === undefined) {
+            throw new Error("unknown packet type " + p.type)
+        }
+
+        // look up attachments if type binary
+        if (
+            p.type === PacketType.BINARY_EVENT ||
+            p.type === PacketType.BINARY_ACK
+        ) {
+            const start = i + 1
+            while (str.charAt(++i) !== "-" && i != str.length) { }
+            const buf = str.substring(start, i)
+            if (buf != Number(buf) || str.charAt(i) !== "-") {
+                throw new Error("Illegal attachments")
+            }
+            p.attachments = Number(buf)
+        }
+
+        // look up namespace (if any)
+        if ("/" === str.charAt(i + 1)) {
+            const start = i + 1
+            while (++i) {
+                const c = str.charAt(i)
+                if ("," === c) break
+                if (i === str.length) break
+            }
+            p.nsp = str.substring(start, i)
+        } else {
+            p.nsp = "/"
+        }
+
+        // look up id
+        const next = str.charAt(i + 1)
+        if ("" !== next && Number(next) == next) {
+            const start = i + 1
+            while (++i) {
+                const c = str.charAt(i)
+                if (null == c || Number(c) != c) {
+                    --i
+                    break
+                }
+                if (i === str.length) break
+            }
+            p.id = Number(str.substring(start, i + 1))
+        }
+
+        // look up json data
+        if (str.charAt(++i)) {
+            const payload = tryParse(str.substr(i))
+            if (Decoder.isPayloadValid(p.type, payload)) {
+                p.data = payload
+            } else {
+                throw new Error("invalid payload")
+            }
+        }
+
+        console.trace("decoded", str, "as", p)
+        return p
+    }
+
+    private static isPayloadValid(type: PacketType, payload: any): boolean {
+        switch (type) {
+            case PacketType.CONNECT:
+                return typeof payload === "object"
+            case PacketType.DISCONNECT:
+                return payload === undefined
+            case PacketType.CONNECT_ERROR:
+                return typeof payload === "string" || typeof payload === "object"
+            case PacketType.EVENT:
+            case PacketType.BINARY_EVENT:
+                return Array.isArray(payload) && payload.length > 0
+            case PacketType.ACK:
+            case PacketType.BINARY_ACK:
+                return Array.isArray(payload)
+        }
+    }
+
+    /**
+     * Deallocates a parser's resources
+     */
+    public destroy() {
+        if (this.reconstructor) {
+            this.reconstructor.finishedReconstruction()
+        }
+    }
+}
+
+function tryParse(str) {
+    try {
+        return JSON.parse(str)
+    } catch (e) {
+        return false
+    }
+}
+
+/**
+ * A manager of a binary event's 'buffer sequence'. Should
+ * be constructed whenever a packet of type BINARY_EVENT is
+ * decoded.
+ *
+ * @param {Object} packet
+ * @return {BinaryReconstructor} initialized reconstructor
+ */
+
+class BinaryReconstructor {
+    private reconPack
+    private buffers: Array<Buffer | ArrayBuffer> = [];
+
+    constructor(readonly packet: Packet) {
+        this.reconPack = packet
+    }
+
+    /**
+     * Method to be called when binary data received from connection
+     * after a BINARY_EVENT packet.
+     *
+     * @param {Buffer | ArrayBuffer} binData - the raw binary data received
+     * @return {null | Object} returns null if more binary data is expected or
+     *   a reconstructed packet object if all buffers have been received.
+     */
+    public takeBinaryData(binData) {
+        this.buffers.push(binData)
+        if (this.buffers.length === this.reconPack.attachments) {
+            // done with buffer list
+            const packet = reconstructPacket(this.reconPack, this.buffers)
+            this.finishedReconstruction()
+            return packet
+        }
+        return null
+    }
+
+    /**
+     * Cleans up binary packet reconstruction variables.
+     */
+    public finishedReconstruction() {
+        this.reconPack = null
+        this.buffers = []
+    }
+}
diff --git a/packages/websocket/src/socket.io-parser/is-binary.ts b/packages/websocket/src/socket.io-parser/is-binary.ts
new file mode 100644
index 00000000..505173dd
--- /dev/null
+++ b/packages/websocket/src/socket.io-parser/is-binary.ts
@@ -0,0 +1,65 @@
+const withNativeArrayBuffer: boolean = typeof ArrayBuffer === "function"
+
+const isView = (obj: any) => {
+    return typeof ArrayBuffer.isView === "function"
+        ? ArrayBuffer.isView(obj)
+        : obj.buffer instanceof ArrayBuffer
+}
+
+const toString = Object.prototype.toString
+const withNativeBlob = false
+// typeof Blob === "function" ||
+// (typeof Blob !== "undefined" &&
+//     toString.call(Blob) === "[object BlobConstructor]")
+const withNativeFile = false
+// typeof File === "function" ||
+// (typeof File !== "undefined" &&
+//     toString.call(File) === "[object FileConstructor]")
+
+/**
+ * Returns true if obj is a Buffer, an ArrayBuffer, a Blob or a File.
+ *
+ * @private
+ */
+
+export function isBinary(obj: any) {
+    return (
+        (withNativeArrayBuffer && (obj instanceof ArrayBuffer || isView(obj)))
+        // || (withNativeBlob && obj instanceof Blob) || (withNativeFile && obj instanceof File)
+    )
+}
+
+export function hasBinary(obj: any, toJSON?: boolean) {
+    if (!obj || typeof obj !== "object") {
+        return false
+    }
+
+    if (Array.isArray(obj)) {
+        for (let i = 0, l = obj.length; i < l; i++) {
+            if (hasBinary(obj[i])) {
+                return true
+            }
+        }
+        return false
+    }
+
+    if (isBinary(obj)) {
+        return true
+    }
+
+    if (
+        obj.toJSON &&
+        typeof obj.toJSON === "function" &&
+        arguments.length === 1
+    ) {
+        return hasBinary(obj.toJSON(), true)
+    }
+
+    for (const key in obj) {
+        if (Object.prototype.hasOwnProperty.call(obj, key) && hasBinary(obj[key])) {
+            return true
+        }
+    }
+
+    return false
+}
diff --git a/packages/websocket/src/socket.io/broadcast-operator.ts b/packages/websocket/src/socket.io/broadcast-operator.ts
new file mode 100644
index 00000000..0a005275
--- /dev/null
+++ b/packages/websocket/src/socket.io/broadcast-operator.ts
@@ -0,0 +1,320 @@
+// import type { BroadcastFlags, Room, SocketId } from "socket.io-adapter"
+import type { BroadcastFlags, Room, SocketId } from "../socket.io-adapter"
+import { Handshake, RESERVED_EVENTS, Socket } from "./socket"
+// import { PacketType } from "socket.io-parser"
+import { PacketType } from "../socket.io-parser"
+// import type { Adapter } from "socket.io-adapter"
+import type { Adapter } from "../socket.io-adapter"
+import type {
+    EventParams,
+    EventNames,
+    EventsMap,
+    TypedEventBroadcaster,
+} from "./typed-events"
+
+export class BroadcastOperator<EmitEvents extends EventsMap>
+    implements TypedEventBroadcaster<EmitEvents>
+{
+    constructor(
+        private readonly adapter: Adapter,
+        private readonly rooms: Set<Room> = new Set<Room>(),
+        private readonly exceptRooms: Set<Room> = new Set<Room>(),
+        private readonly flags: BroadcastFlags = {}
+    ) { }
+
+    /**
+     * Targets a room when emitting.
+     *
+     * @param room
+     * @return a new BroadcastOperator instance
+     * @public
+     */
+    public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+        const rooms = new Set(this.rooms)
+        if (Array.isArray(room)) {
+            room.forEach((r) => rooms.add(r))
+        } else {
+            rooms.add(room)
+        }
+        return new BroadcastOperator(
+            this.adapter,
+            rooms,
+            this.exceptRooms,
+            this.flags
+        )
+    }
+
+    /**
+     * Targets a room when emitting.
+     *
+     * @param room
+     * @return a new BroadcastOperator instance
+     * @public
+     */
+    public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+        return this.to(room)
+    }
+
+    /**
+     * Excludes a room when emitting.
+     *
+     * @param room
+     * @return a new BroadcastOperator instance
+     * @public
+     */
+    public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+        const exceptRooms = new Set(this.exceptRooms)
+        if (Array.isArray(room)) {
+            room.forEach((r) => exceptRooms.add(r))
+        } else {
+            exceptRooms.add(room)
+        }
+        return new BroadcastOperator(
+            this.adapter,
+            this.rooms,
+            exceptRooms,
+            this.flags
+        )
+    }
+
+    /**
+     * Sets the compress flag.
+     *
+     * @param compress - if `true`, compresses the sending data
+     * @return a new BroadcastOperator instance
+     * @public
+     */
+    public compress(compress: boolean): BroadcastOperator<EmitEvents> {
+        const flags = Object.assign({}, this.flags, { compress })
+        return new BroadcastOperator(
+            this.adapter,
+            this.rooms,
+            this.exceptRooms,
+            flags
+        )
+    }
+
+    /**
+     * Sets a modifier for a subsequent event emission that the event data may be lost if the client is not ready to
+     * receive messages (because of network slowness or other issues, or because they’re connected through long polling
+     * and is in the middle of a request-response cycle).
+     *
+     * @return a new BroadcastOperator instance
+     * @public
+     */
+    public get volatile(): BroadcastOperator<EmitEvents> {
+        const flags = Object.assign({}, this.flags, { volatile: true })
+        return new BroadcastOperator(
+            this.adapter,
+            this.rooms,
+            this.exceptRooms,
+            flags
+        )
+    }
+
+    /**
+     * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
+     *
+     * @return a new BroadcastOperator instance
+     * @public
+     */
+    public get local(): BroadcastOperator<EmitEvents> {
+        const flags = Object.assign({}, this.flags, { local: true })
+        return new BroadcastOperator(
+            this.adapter,
+            this.rooms,
+            this.exceptRooms,
+            flags
+        )
+    }
+
+    /**
+     * Emits to all clients.
+     *
+     * @return Always true
+     * @public
+     */
+    public emit<Ev extends EventNames<EmitEvents>>(
+        ev: Ev,
+        ...args: EventParams<EmitEvents, Ev>
+    ): boolean {
+        if (RESERVED_EVENTS.has(ev)) {
+            throw new Error(`"${ev}" is a reserved event name`)
+        }
+        // set up packet object
+        const data = [ev, ...args]
+        const packet = {
+            type: PacketType.EVENT,
+            data: data,
+        }
+
+        if ("function" == typeof data[data.length - 1]) {
+            throw new Error("Callbacks are not supported when broadcasting")
+        }
+
+        this.adapter.broadcast(packet, {
+            rooms: this.rooms,
+            except: this.exceptRooms,
+            flags: this.flags,
+        })
+
+        return true
+    }
+
+    /**
+     * Gets a list of clients.
+     *
+     * @public
+     */
+    public allSockets(): Promise<Set<SocketId>> {
+        if (!this.adapter) {
+            throw new Error(
+                "No adapter for this namespace, are you trying to get the list of clients of a dynamic namespace?"
+            )
+        }
+        return this.adapter.sockets(this.rooms)
+    }
+
+    /**
+     * Returns the matching socket instances
+     *
+     * @public
+     */
+    public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
+        return this.adapter
+            .fetchSockets({
+                rooms: this.rooms,
+                except: this.exceptRooms,
+            })
+            .then((sockets) => {
+                return sockets.map((socket) => {
+                    if (socket instanceof Socket) {
+                        // FIXME the TypeScript compiler complains about missing private properties
+                        return socket as unknown as RemoteSocket<EmitEvents>
+                    } else {
+                        return new RemoteSocket(this.adapter, socket as SocketDetails)
+                    }
+                })
+            })
+    }
+
+    /**
+     * Makes the matching socket instances join the specified rooms
+     *
+     * @param room
+     * @public
+     */
+    public socketsJoin(room: Room | Room[]): void {
+        this.adapter.addSockets(
+            {
+                rooms: this.rooms,
+                except: this.exceptRooms,
+            },
+            Array.isArray(room) ? room : [room]
+        )
+    }
+
+    /**
+     * Makes the matching socket instances leave the specified rooms
+     *
+     * @param room
+     * @public
+     */
+    public socketsLeave(room: Room | Room[]): void {
+        this.adapter.delSockets(
+            {
+                rooms: this.rooms,
+                except: this.exceptRooms,
+            },
+            Array.isArray(room) ? room : [room]
+        )
+    }
+
+    /**
+     * Makes the matching socket instances disconnect
+     *
+     * @param close - whether to close the underlying connection
+     * @public
+     */
+    public disconnectSockets(close: boolean = false): void {
+        this.adapter.disconnectSockets(
+            {
+                rooms: this.rooms,
+                except: this.exceptRooms,
+            },
+            close
+        )
+    }
+}
+
+/**
+ * Format of the data when the Socket instance exists on another Socket.IO server
+ */
+interface SocketDetails {
+    id: SocketId
+    handshake: Handshake
+    rooms: Room[]
+    data: any
+}
+
+/**
+ * Expose of subset of the attributes and methods of the Socket class
+ */
+export class RemoteSocket<EmitEvents extends EventsMap>
+    implements TypedEventBroadcaster<EmitEvents>
+{
+    public readonly id: SocketId
+    public readonly handshake: Handshake
+    public readonly rooms: Set<Room>
+    public readonly data: any
+
+    private readonly operator: BroadcastOperator<EmitEvents>
+
+    constructor(adapter: Adapter, details: SocketDetails) {
+        this.id = details.id
+        this.handshake = details.handshake
+        this.rooms = new Set(details.rooms)
+        this.data = details.data
+        this.operator = new BroadcastOperator(adapter, new Set([this.id]))
+    }
+
+    public emit<Ev extends EventNames<EmitEvents>>(
+        ev: Ev,
+        ...args: EventParams<EmitEvents, Ev>
+    ): boolean {
+        return this.operator.emit(ev, ...args)
+    }
+
+    /**
+     * Joins a room.
+     *
+     * @param {String|Array} room - room or array of rooms
+     * @public
+     */
+    public join(room: Room | Room[]): void {
+        return this.operator.socketsJoin(room)
+    }
+
+    /**
+     * Leaves a room.
+     *
+     * @param {String} room
+     * @public
+     */
+    public leave(room: Room): void {
+        return this.operator.socketsLeave(room)
+    }
+
+    /**
+     * Disconnects this client.
+     *
+     * @param {Boolean} close - if `true`, closes the underlying connection
+     * @return {Socket} self
+     *
+     * @public
+     */
+    public disconnect(close = false): this {
+        this.operator.disconnectSockets(close)
+        return this
+    }
+}
diff --git a/packages/websocket/src/socket.io/client.ts b/packages/websocket/src/socket.io/client.ts
new file mode 100644
index 00000000..baed82c7
--- /dev/null
+++ b/packages/websocket/src/socket.io/client.ts
@@ -0,0 +1,331 @@
+// import { Decoder, Encoder, Packet, PacketType } from "socket.io-parser"
+import { Decoder, Encoder, Packet, PacketType } from "../socket.io-parser"
+// import debugModule = require("debug")
+import url = require("url")
+// import type { IncomingMessage } from "http"
+import type { Server } from "./index"
+import type { Namespace } from "./namespace"
+import type { EventsMap } from "./typed-events"
+import type { Socket } from "./socket"
+// import type { SocketId } from "socket.io-adapter"
+import type { SocketId } from "../socket.io-adapter"
+import type { Socket as EngineIOSocket } from '../engine.io/socket'
+
+// const debug = debugModule("socket.io:client");
+
+interface WriteOptions {
+    compress?: boolean
+    volatile?: boolean
+    preEncoded?: boolean
+    wsPreEncoded?: string
+}
+
+export class Client<
+    ListenEvents extends EventsMap,
+    EmitEvents extends EventsMap,
+    ServerSideEvents extends EventsMap
+    > {
+    public readonly conn: EngineIOSocket
+    /**
+     * @private
+     */
+    readonly id: string
+    private readonly server: Server<ListenEvents, EmitEvents, ServerSideEvents>
+    private readonly encoder: Encoder
+    private readonly decoder: any
+    private sockets: Map<
+        SocketId,
+        Socket<ListenEvents, EmitEvents, ServerSideEvents>
+    > = new Map()
+    private nsps: Map<
+        string,
+        Socket<ListenEvents, EmitEvents, ServerSideEvents>
+    > = new Map()
+    private connectTimeout: NodeJS.Timeout
+
+    /**
+     * Client constructor.
+     *
+     * @param server instance
+     * @param conn
+     * @package
+     */
+    constructor(
+        server: Server<ListenEvents, EmitEvents, ServerSideEvents>,
+        conn: EngineIOSocket
+    ) {
+        this.server = server
+        this.conn = conn
+        this.encoder = server.encoder
+        this.decoder = new server._parser.Decoder()
+        this.id = conn.id
+        this.setup()
+    }
+
+    /**
+     * @return the reference to the request that originated the Engine.IO connection
+     *
+     * @public
+     */
+    public get request(): any/** IncomingMessage */ {
+        return this.conn.request
+    }
+
+    /**
+     * Sets up event listeners.
+     *
+     * @private
+     */
+    private setup() {
+        console.debug(`socket.io client setup conn ${this.conn.id}`)
+        this.onclose = this.onclose.bind(this)
+        this.ondata = this.ondata.bind(this)
+        this.onerror = this.onerror.bind(this)
+        this.ondecoded = this.ondecoded.bind(this)
+
+        // @ts-ignore
+        this.decoder.on("decoded", this.ondecoded)
+        this.conn.on("data", this.ondata)
+        this.conn.on("error", this.onerror)
+        this.conn.on("close", this.onclose)
+
+        this.connectTimeout = setTimeout(() => {
+            if (this.nsps.size === 0) {
+                console.debug(`no namespace joined yet, close the client ${this.id}`)
+                this.close()
+            } else {
+                console.debug(`the client ${this.id} has already joined a namespace, nothing to do`)
+            }
+        }, this.server._connectTimeout)
+    }
+
+    /**
+     * Connects a client to a namespace.
+     *
+     * @param {String} name - the namespace
+     * @param {Object} auth - the auth parameters
+     * @private
+     */
+    private connect(name: string, auth: object = {}): void {
+        if (this.server._nsps.has(name)) {
+            console.debug(`socket.io client ${this.id} connecting to namespace ${name}`)
+            return this.doConnect(name, auth)
+        }
+
+        this.server._checkNamespace(
+            name,
+            auth,
+            (
+                dynamicNspName:
+                    | Namespace<ListenEvents, EmitEvents, ServerSideEvents>
+                    | false
+            ) => {
+                if (dynamicNspName) {
+                    console.debug(`dynamic namespace ${dynamicNspName} was created`)
+                    this.doConnect(name, auth)
+                } else {
+                    console.debug(`creation of namespace ${name} was denied`)
+                    this._packet({
+                        type: PacketType.CONNECT_ERROR,
+                        nsp: name,
+                        data: {
+                            message: "Invalid namespace",
+                        },
+                    })
+                }
+            }
+        )
+    }
+
+    /**
+     * Connects a client to a namespace.
+     *
+     * @param name - the namespace
+     * @param {Object} auth - the auth parameters
+     *
+     * @private
+     */
+    private doConnect(name: string, auth: object): void {
+        const nsp = this.server.of(name)
+
+        // @java-patch multi thread need direct callback socket
+        const socket = nsp._add(this, auth, (socket) => {
+            this.sockets.set(socket.id, socket)
+            this.nsps.set(nsp.name, socket)
+
+            if (this.connectTimeout) {
+                clearTimeout(this.connectTimeout)
+                this.connectTimeout = undefined
+            }
+        })
+    }
+
+    /**
+     * Disconnects from all namespaces and closes transport.
+     *
+     * @private
+     */
+    _disconnect(): void {
+        for (const socket of this.sockets.values()) {
+            socket.disconnect()
+        }
+        this.sockets.clear()
+        this.close()
+    }
+
+    /**
+     * Removes a socket. Called by each `Socket`.
+     *
+     * @private
+     */
+    _remove(socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>): void {
+        if (this.sockets.has(socket.id)) {
+            const nsp = this.sockets.get(socket.id)!.nsp.name
+            this.sockets.delete(socket.id)
+            this.nsps.delete(nsp)
+        } else {
+            console.debug("ignoring remove for", socket.id)
+        }
+        // @java-patch  disconnect client when no live socket
+        process.nextTick(() => {
+            if (this.sockets.size == 0) {
+                this.onclose('no live socket')
+            }
+        })
+    }
+
+    /**
+     * Closes the underlying connection.
+     *
+     * @private
+     */
+    private close(): void {
+        console.debug(`client ${this.id} clise - reason: forcing transport close`)
+        if ("open" === this.conn.readyState) {
+            console.debug("forcing transport close")
+            this.conn.close()
+            this.onclose("forced server close")
+        }
+    }
+
+    /**
+   * Writes a packet to the transport.
+   *
+   * @param {Object} packet object
+   * @param {Object} opts
+   * @private
+   */
+    _packet(packet: Packet | any[], opts: WriteOptions = {}): void {
+        if (this.conn.readyState !== "open") {
+            console.debug(`client ${this.id} ignoring packet write ${JSON.stringify(packet)}`)
+            return
+        }
+        const encodedPackets = opts.preEncoded
+            ? (packet as any[]) // previous versions of the adapter incorrectly used socket.packet() instead of writeToEngine()
+            : this.encoder.encode(packet as Packet)
+        for (const encodedPacket of encodedPackets) {
+            this.writeToEngine(encodedPacket, opts)
+        }
+    }
+
+    private writeToEngine(
+        encodedPacket: String | Buffer,
+        opts: WriteOptions
+    ): void {
+        if (opts.volatile && !this.conn.transport.writable) {
+            console.debug(`client ${this.id} volatile packet is discarded since the transport is not currently writable`)
+            return
+        }
+        this.conn.write(encodedPacket, opts)
+    }
+
+    /**
+     * Called with incoming transport data.
+     *
+     * @private
+     */
+    private ondata(data): void {
+        // try/catch is needed for protocol violations (GH-1880)
+        try {
+            this.decoder.add(data)
+        } catch (e) {
+            this.onerror(e)
+        }
+    }
+
+    /**
+     * Called when parser fully decodes a packet.
+     *
+     * @private
+     */
+    private ondecoded(packet: Packet): void {
+        if (PacketType.CONNECT === packet.type) {
+            if (this.conn.protocol === 3) {
+                const parsed = url.parse(packet.nsp, true)
+                this.connect(parsed.pathname!, parsed.query)
+            } else {
+                this.connect(packet.nsp, packet.data)
+            }
+        } else {
+            const socket = this.nsps.get(packet.nsp)
+            if (socket) {
+                process.nextTick(function () {
+                    socket._onpacket(packet)
+                })
+            } else {
+                console.debug(`client ${this.id} no socket for namespace ${packet.nsp}.`)
+            }
+        }
+    }
+
+    /**
+     * Handles an error.
+     *
+     * @param {Object} err object
+     * @private
+     */
+    private onerror(err): void {
+        for (const socket of this.sockets.values()) {
+            socket._onerror(err)
+        }
+        this.conn.close()
+    }
+
+    /**
+     * Called upon transport close.
+     *
+     * @param reason
+     * @private
+     */
+    private onclose(reason: string): void {
+        console.debug(`client ${this.id} close with reason ${reason}`)
+
+        // ignore a potential subsequent `close` event
+        this.destroy()
+
+        // `nsps` and `sockets` are cleaned up seamlessly
+        for (const socket of this.sockets.values()) {
+            socket._onclose(reason)
+        }
+        this.sockets.clear()
+
+        this.decoder.destroy() // clean up decoder
+    }
+
+    /**
+     * Cleans up event listeners.
+     * @private
+     */
+    private destroy(): void {
+        this.conn.removeListener("data", this.ondata)
+        this.conn.removeListener("error", this.onerror)
+        this.conn.removeListener("close", this.onclose)
+        // @ts-ignore
+        this.decoder.removeListener("decoded", this.ondecoded)
+
+        if (this.connectTimeout) {
+            clearTimeout(this.connectTimeout)
+            this.connectTimeout = undefined
+        }
+    }
+}
diff --git a/packages/websocket/src/socket.io/index.ts b/packages/websocket/src/socket.io/index.ts
new file mode 100644
index 00000000..002f1caf
--- /dev/null
+++ b/packages/websocket/src/socket.io/index.ts
@@ -0,0 +1,825 @@
+// import http = require("http");
+// import { createReadStream } from "fs";
+// import { createDeflate, createGzip, createBrotliCompress } from "zlib";
+// import accepts = require("accepts");
+// import { pipeline } from "stream";
+// import path = require("path");
+import engine = require("../engine.io")
+import { Client } from './client'
+import { EventEmitter } from 'events'
+import { ExtendedError, Namespace, ServerReservedEventsMap } from "./namespace"
+import { ParentNamespace } from './parent-namespace'
+// import { Adapter, Room, SocketId } from "socket.io-adapter"
+import { Adapter, Room, SocketId } from "../socket.io-adapter"
+// import * as parser from "socket.io-parser";
+import * as parser from "../socket.io-parser"
+// import type { Encoder } from "socket.io-parser";
+import type { Encoder } from "../socket.io-parser"
+// import debugModule from "debug";
+import { Socket } from './socket'
+// import type { CookieSerializeOptions } from "cookie";
+// import type { CorsOptions } from "cors";
+import type { BroadcastOperator, RemoteSocket } from "./broadcast-operator"
+import {
+    EventsMap,
+    DefaultEventsMap,
+    EventParams,
+    StrictEventEmitter,
+    EventNames,
+} from "./typed-events"
+
+import type { Socket as EngineIOSocket } from '../engine.io/socket'
+
+// const clientVersion = require("../package.json").version
+// const dotMapRegex = /\.map/
+
+// type Transport = "polling" | "websocket";
+type ParentNspNameMatchFn = (
+    name: string,
+    auth: { [key: string]: any },
+    fn: (err: Error | null, success: boolean) => void
+) => void
+
+type AdapterConstructor = typeof Adapter | ((nsp: Namespace) => Adapter)
+
+interface EngineOptions {
+    /**
+     * how many ms without a pong packet to consider the connection closed
+     * @default 5000
+     */
+    pingTimeout: number
+    /**
+     * how many ms before sending a new ping packet
+     * @default 25000
+     */
+    pingInterval: number
+    /**
+     * how many ms before an uncompleted transport upgrade is cancelled
+     * @default 10000
+     */
+    upgradeTimeout: number
+    /**
+     * how many bytes or characters a message can be, before closing the session (to avoid DoS).
+     * @default 1e5 (100 KB)
+     */
+    maxHttpBufferSize: number
+    /**
+     * A function that receives a given handshake or upgrade request as its first parameter,
+     * and can decide whether to continue or not. The second argument is a function that needs
+     * to be called with the decided information: fn(err, success), where success is a boolean
+     * value where false means that the request is rejected, and err is an error code.
+     */
+    // allowRequest: (
+    //     req: http.IncomingMessage,
+    //     fn: (err: string | null | undefined, success: boolean) => void
+    // ) => void
+    /**
+     * the low-level transports that are enabled
+     * @default ["polling", "websocket"]
+     */
+    // transports: Transport[]
+    /**
+     * whether to allow transport upgrades
+     * @default true
+     */
+    allowUpgrades: boolean
+    /**
+     * parameters of the WebSocket permessage-deflate extension (see ws module api docs). Set to false to disable.
+     * @default false
+     */
+    perMessageDeflate: boolean | object
+    /**
+     * parameters of the http compression for the polling transports (see zlib api docs). Set to false to disable.
+     * @default true
+     */
+    httpCompression: boolean | object
+    /**
+     * what WebSocket server implementation to use. Specified module must
+     * conform to the ws interface (see ws module api docs). Default value is ws.
+     * An alternative c++ addon is also available by installing uws module.
+     */
+    wsEngine: string
+    /**
+     * an optional packet which will be concatenated to the handshake packet emitted by Engine.IO.
+     */
+    initialPacket: any
+    /**
+     * configuration of the cookie that contains the client sid to send as part of handshake response headers. This cookie
+     * might be used for sticky-session. Defaults to not sending any cookie.
+     * @default false
+     */
+    // cookie: CookieSerializeOptions | boolean
+    /**
+     * the options that will be forwarded to the cors module
+     */
+    // cors: CorsOptions
+    /**
+     * whether to enable compatibility with Socket.IO v2 clients
+     * @default false
+     */
+    allowEIO3: boolean
+}
+
+interface AttachOptions {
+    /**
+     * name of the path to capture
+     * @default "/engine.io"
+     */
+    path: string
+    /**
+     * destroy unhandled upgrade requests
+     * @default true
+     */
+    destroyUpgrade: boolean
+    /**
+     * milliseconds after which unhandled requests are ended
+     * @default 1000
+     */
+    destroyUpgradeTimeout: number
+}
+
+interface EngineAttachOptions extends EngineOptions, AttachOptions { }
+
+interface ServerOptions extends EngineAttachOptions {
+    /**
+     * name of the path to capture
+     * @default "/socket.io"
+     */
+    path: string
+    /**
+     * whether to serve the client files
+     * @default true
+     */
+    serveClient: boolean
+    /**
+     * the adapter to use
+     * @default the in-memory adapter (https://github.com/socketio/socket.io-adapter)
+     */
+    adapter: any
+    /**
+     * the parser to use
+     * @default the default parser (https://github.com/socketio/socket.io-parser)
+     */
+    parser: any
+    /**
+     * how many ms before a client without namespace is closed
+     * @default 45000
+     */
+    connectTimeout: number
+}
+
+export class Server<
+    ListenEvents extends EventsMap = DefaultEventsMap,
+    EmitEvents extends EventsMap = ListenEvents,
+    ServerSideEvents extends EventsMap = DefaultEventsMap
+    > extends StrictEventEmitter<
+    ServerSideEvents,
+    EmitEvents,
+    ServerReservedEventsMap<ListenEvents, EmitEvents, ServerSideEvents>
+    > {
+    public readonly sockets: Namespace<
+        ListenEvents,
+        EmitEvents,
+        ServerSideEvents
+    >
+    /**
+     * A reference to the underlying Engine.IO server.
+     *
+     * Example:
+     *
+     * <code>
+     *   const clientsCount = io.engine.clientsCount;
+     * </code>
+     *
+     */
+    public engine: any
+    /** @private */
+    readonly _parser: typeof parser
+    /** @private */
+    readonly encoder: Encoder
+
+    /**
+     * @private
+     */
+    _nsps: Map<string, Namespace<ListenEvents, EmitEvents, ServerSideEvents>> =
+        new Map();
+    private parentNsps: Map<
+        ParentNspNameMatchFn,
+        ParentNamespace<ListenEvents, EmitEvents, ServerSideEvents>
+    > = new Map();
+    private _adapter?: AdapterConstructor
+    private _serveClient: boolean
+    private opts: Partial<EngineOptions>
+    private eio
+    private _path: string
+    private clientPathRegex: RegExp
+    /**
+     * @private
+     */
+    _connectTimeout: number
+
+    // private httpServer: http.Server
+
+    constructor(srv: any, opts: Partial<ServerOptions> = {}) {
+        super()
+        if (!srv) { throw new Error('srv can\'t be undefiend!') }
+        // if (
+        //     "object" === typeof srv &&
+        //     srv instanceof Object &&
+        //     !(srv as Partial<http.Server>).listen
+        // ) {
+        //     opts = srv as Partial<ServerOptions>
+        //     srv = undefined
+        // }
+        this.path(opts.path || "/socket.io")
+        this.connectTimeout(opts.connectTimeout || 45000)
+        this.serveClient(false !== opts.serveClient)
+        this._parser = opts.parser || parser
+        this.encoder = new this._parser.Encoder()
+        this.adapter(opts.adapter || Adapter)
+        this.sockets = this.of('/')
+        // if (srv) this.attach(srv as http.Server);
+        this.attach(srv, this.opts)
+    }
+
+    /**
+     * Sets/gets whether client code is being served.
+     *
+     * @param v - whether to serve client code
+     * @return self when setting or value when getting
+     * @public
+     */
+    public serveClient(v: boolean): this
+    public serveClient(): boolean
+    public serveClient(v?: boolean): this | boolean
+    public serveClient(v?: boolean): this | boolean {
+        if (!arguments.length) return this._serveClient
+        this._serveClient = v!
+        return this
+    }
+
+    /**
+     * Executes the middleware for an incoming namespace not already created on the server.
+     *
+     * @param name - name of incoming namespace
+     * @param auth - the auth parameters
+     * @param fn - callback
+     *
+     * @private
+     */
+    _checkNamespace(
+        name: string,
+        auth: { [key: string]: any },
+        fn: (
+            nsp: Namespace<ListenEvents, EmitEvents, ServerSideEvents> | false
+        ) => void
+    ): void {
+        if (this.parentNsps.size === 0) return fn(false)
+
+        const keysIterator = this.parentNsps.keys()
+
+        const run = () => {
+            const nextFn = keysIterator.next()
+            if (nextFn.done) {
+                return fn(false)
+            }
+            nextFn.value(name, auth, (err, allow) => {
+                if (err || !allow) {
+                    run()
+                } else {
+                    const namespace = this.parentNsps
+                        .get(nextFn.value)!
+                        .createChild(name)
+                    // @ts-ignore
+                    this.sockets.emitReserved("new_namespace", namespace)
+                    fn(namespace)
+                }
+            })
+        }
+
+        run()
+    }
+
+    /**
+     * Sets the client serving path.
+     *
+     * @param {String} v pathname
+     * @return {Server|String} self when setting or value when getting
+     * @public
+     */
+    public path(v: string): this
+    public path(): string
+    public path(v?: string): this | string
+    public path(v?: string): this | string {
+        if (!arguments.length) return this._path
+
+        this._path = v!.replace(/\/$/, "")
+
+        const escapedPath = this._path.replace(/[-\/\\^$*+?.()|[\]{}]/g, "\\$&")
+        this.clientPathRegex = new RegExp(
+            "^" +
+            escapedPath +
+            "/socket\\.io(\\.min|\\.msgpack\\.min)?\\.js(\\.map)?$"
+        )
+        return this
+    }
+
+    /**
+     * Set the delay after which a client without namespace is closed
+     * @param v
+     * @public
+     */
+    public connectTimeout(v: number): this
+    public connectTimeout(): number
+    public connectTimeout(v?: number): this | number
+    public connectTimeout(v?: number): this | number {
+        if (v === undefined) return this._connectTimeout
+        this._connectTimeout = v
+        return this
+    }
+
+    /**
+     * Sets the adapter for rooms.
+     *
+     * @param v pathname
+     * @return self when setting or value when getting
+     * @public
+     */
+    public adapter(): AdapterConstructor | undefined
+    public adapter(v: AdapterConstructor): this
+    public adapter(
+        v?: AdapterConstructor
+    ): AdapterConstructor | undefined | this {
+        if (!arguments.length) return this._adapter
+        this._adapter = v
+        for (const nsp of this._nsps.values()) {
+            nsp._initAdapter()
+        }
+        return this
+    }
+
+    /**
+     * Attaches socket.io to a server or port.
+     *
+     * @param srv - server or port
+     * @param opts - options passed to engine.io
+     * @return self
+     * @public
+     */
+    public listen(
+        srv: any,//http.Server | number,
+        opts: Partial<ServerOptions> = {}
+    ): this {
+        throw Error('Unsupport listen at MiaoScript Engine!')
+        //return this.attach(srv, opts)
+    }
+
+    /**
+     * Attaches socket.io to a server or port.
+     *
+     * @param srv - server or port
+     * @param opts - options passed to engine.io
+     * @return self
+     * @public
+     */
+    public attach(
+        srv: any,//http.Server | number,
+        opts: Partial<ServerOptions> = {}
+    ): this {
+        // if ("function" == typeof srv) {
+        //     const msg =
+        //         "You are trying to attach socket.io to an express " +
+        //         "request handler function. Please pass a http.Server instance."
+        //     throw new Error(msg)
+        // }
+
+        // // handle a port as a string
+        // if (Number(srv) == srv) {
+        //     srv = Number(srv)
+        // }
+
+        // if ("number" == typeof srv) {
+        //     debug("creating http server and binding to %d", srv)
+        //     const port = srv
+        //     srv = http.createServer((req, res) => {
+        //         res.writeHead(404)
+        //         res.end()
+        //     })
+        //     srv.listen(port)
+        // }
+
+        // merge the options passed to the Socket.IO server
+        Object.assign(opts, this.opts)
+        // set engine.io path to `/socket.io`
+        opts.path = opts.path || this._path
+
+        this.initEngine(srv, opts)
+
+        return this
+    }
+
+    /**
+     * Initialize engine
+     *
+     * @param srv - the server to attach to
+     * @param opts - options passed to engine.io
+     * @private
+     */
+    private initEngine(srv: any, opts: Partial<EngineAttachOptions>) {
+        // // initialize engine
+        console.debug("creating engine.io instance with opts", JSON.stringify(opts))
+        this.eio = engine.attach(srv, opts)
+
+        // // attach static file serving
+        // if (this._serveClient) this.attachServe(srv)
+
+        // // Export http server
+        // this.httpServer = srv
+
+        // bind to engine events
+        this.bind(this.eio)
+    }
+
+    // /**
+    //  * Attaches the static file serving.
+    //  *
+    //  * @param srv http server
+    //  * @private
+    //  */
+    // private attachServe(srv: http.Server): void {
+    //     debug("attaching client serving req handler")
+
+    //     const evs = srv.listeners("request").slice(0)
+    //     srv.removeAllListeners("request")
+    //     srv.on("request", (req, res) => {
+    //         if (this.clientPathRegex.test(req.url)) {
+    //             this.serve(req, res)
+    //         } else {
+    //             for (let i = 0; i < evs.length; i++) {
+    //                 evs[i].call(srv, req, res)
+    //             }
+    //         }
+    //     })
+    // }
+
+    // /**
+    //  * Handles a request serving of client source and map
+    //  *
+    //  * @param req
+    //  * @param res
+    //  * @private
+    //  */
+    // private serve(req: http.IncomingMessage, res: http.ServerResponse): void {
+    //     const filename = req.url!.replace(this._path, "")
+    //     const isMap = dotMapRegex.test(filename)
+    //     const type = isMap ? "map" : "source"
+
+    //     // Per the standard, ETags must be quoted:
+    //     // https://tools.ietf.org/html/rfc7232#section-2.3
+    //     const expectedEtag = '"' + clientVersion + '"'
+    //     const weakEtag = "W/" + expectedEtag
+
+    //     const etag = req.headers["if-none-match"]
+    //     if (etag) {
+    //         if (expectedEtag === etag || weakEtag === etag) {
+    //             debug("serve client %s 304", type)
+    //             res.writeHead(304)
+    //             res.end()
+    //             return
+    //         }
+    //     }
+
+    //     debug("serve client %s", type)
+
+    //     res.setHeader("Cache-Control", "public, max-age=0")
+    //     res.setHeader(
+    //         "Content-Type",
+    //         "application/" + (isMap ? "json" : "javascript")
+    //     )
+    //     res.setHeader("ETag", expectedEtag)
+
+    //     Server.sendFile(filename, req, res)
+    // }
+
+    // /**
+    //  * @param filename
+    //  * @param req
+    //  * @param res
+    //  * @private
+    //  */
+    // private static sendFile(
+    //     filename: string,
+    //     req: http.IncomingMessage,
+    //     res: http.ServerResponse
+    // ): void {
+    //     const readStream = createReadStream(
+    //         path.join(__dirname, "../client-dist/", filename)
+    //     )
+    //     const encoding = accepts(req).encodings(["br", "gzip", "deflate"])
+
+    //     const onError = (err: NodeJS.ErrnoException | null) => {
+    //         if (err) {
+    //             res.end()
+    //         }
+    //     }
+
+    //     switch (encoding) {
+    //         case "br":
+    //             res.writeHead(200, { "content-encoding": "br" })
+    //             readStream.pipe(createBrotliCompress()).pipe(res)
+    //             pipeline(readStream, createBrotliCompress(), res, onError)
+    //             break
+    //         case "gzip":
+    //             res.writeHead(200, { "content-encoding": "gzip" })
+    //             pipeline(readStream, createGzip(), res, onError)
+    //             break
+    //         case "deflate":
+    //             res.writeHead(200, { "content-encoding": "deflate" })
+    //             pipeline(readStream, createDeflate(), res, onError)
+    //             break
+    //         default:
+    //             res.writeHead(200)
+    //             pipeline(readStream, res, onError)
+    //     }
+    // }
+
+    /**
+     * Binds socket.io to an engine.io instance.
+     *
+     * @param {engine.Server} engine engine.io (or compatible) server
+     * @return {Server} self
+     * @public
+     */
+    public bind(engine): Server {
+        console.debug('engine.io', engine.constructor.name, 'bind to socket.io')
+        this.engine = engine
+        this.engine.on("connection", this.onconnection.bind(this))
+        return this
+    }
+
+    /**
+     * Called with each incoming transport connection.
+     *
+     * @param {engine.Socket} conn
+     * @return {Server} self
+     * @private
+     */
+    private onconnection(conn: EngineIOSocket): Server {
+        console.debug(`socket.io index incoming connection with id ${conn.id}`)
+        let client = new Client(this, conn)
+        if (conn.protocol === 3) {
+            // @ts-ignore
+            client.connect("/")
+        }
+        return this
+    }
+
+    /**
+     * Looks up a namespace.
+     *
+     * @param {String|RegExp|Function} name nsp name
+     * @param fn optional, nsp `connection` ev handler
+     * @public
+     */
+    public of(
+        name: string | RegExp | ParentNspNameMatchFn,
+        fn?: (socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>) => void
+    ): Namespace<ListenEvents, EmitEvents, ServerSideEvents> {
+        if (typeof name === "function" || name instanceof RegExp) {
+            const parentNsp = new ParentNamespace(this)
+            console.debug(`initializing parent namespace ${parentNsp.name}`)
+            if (typeof name === "function") {
+                this.parentNsps.set(name, parentNsp)
+            } else {
+                this.parentNsps.set(
+                    (nsp, conn, next) => next(null, (name as RegExp).test(nsp)),
+                    parentNsp
+                )
+            }
+            if (fn) {
+                // @ts-ignore
+                parentNsp.on("connect", fn)
+            }
+            return parentNsp
+        }
+
+        if (String(name)[0] !== "/") name = "/" + name
+
+        let nsp = this._nsps.get(name)
+        if (!nsp) {
+            console.debug("initializing namespace", name)
+            nsp = new Namespace(this, name)
+            this._nsps.set(name, nsp)
+            if (name !== "/") {
+                // @ts-ignore
+                this.sockets.emitReserved("new_namespace", nsp)
+            }
+        }
+        if (fn) nsp.on("connect", fn)
+        return nsp
+    }
+
+    /**
+     * Closes server connection
+     *
+     * @param [fn] optional, called as `fn([err])` on error OR all conns closed
+     * @public
+     */
+    public close(fn?: (err?: Error) => void): void {
+        for (const socket of this.sockets.sockets.values()) {
+            socket._onclose("server shutting down")
+        }
+
+        this.engine.close()
+
+        // if (this.httpServer) {
+        //     this.httpServer.close(fn)
+        // } else {
+        fn && fn()
+        // }
+    }
+
+    /**
+     * Sets up namespace middleware.
+     *
+     * @return self
+     * @public
+     */
+    public use(
+        fn: (
+            socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
+            next: (err?: ExtendedError) => void
+        ) => void
+    ): this {
+        this.sockets.use(fn)
+        return this
+    }
+
+    /**
+     * Targets a room when emitting.
+     *
+     * @param room
+     * @return self
+     * @public
+     */
+    public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+        return this.sockets.to(room)
+    }
+
+    /**
+     * Targets a room when emitting.
+     *
+     * @param room
+     * @return self
+     * @public
+     */
+    public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+        return this.sockets.in(room)
+    }
+
+    /**
+     * Excludes a room when emitting.
+     *
+     * @param name
+     * @return self
+     * @public
+     */
+    public except(name: Room | Room[]): BroadcastOperator<EmitEvents> {
+        return this.sockets.except(name)
+    }
+
+    /**
+     * Sends a `message` event to all clients.
+     *
+     * @return self
+     * @public
+     */
+    public send(...args: EventParams<EmitEvents, "message">): this {
+        this.sockets.emit("message", ...args)
+        return this
+    }
+
+    /**
+     * Sends a `message` event to all clients.
+     *
+     * @return self
+     * @public
+     */
+    public write(...args: EventParams<EmitEvents, "message">): this {
+        this.sockets.emit("message", ...args)
+        return this
+    }
+
+    /**
+     * Emit a packet to other Socket.IO servers
+     *
+     * @param ev - the event name
+     * @param args - an array of arguments, which may include an acknowledgement callback at the end
+     * @public
+     */
+    public serverSideEmit<Ev extends EventNames<ServerSideEvents>>(
+        ev: Ev,
+        ...args: EventParams<ServerSideEvents, Ev>
+    ): boolean {
+        return this.sockets.serverSideEmit(ev, ...args)
+    }
+
+    /**
+     * Gets a list of socket ids.
+     *
+     * @public
+     */
+    public allSockets(): Promise<Set<SocketId>> {
+        return this.sockets.allSockets()
+    }
+
+    /**
+     * Sets the compress flag.
+     *
+     * @param compress - if `true`, compresses the sending data
+     * @return self
+     * @public
+     */
+    public compress(compress: boolean): BroadcastOperator<EmitEvents> {
+        return this.sockets.compress(compress)
+    }
+
+    /**
+     * Sets a modifier for a subsequent event emission that the event data may be lost if the client is not ready to
+     * receive messages (because of network slowness or other issues, or because they’re connected through long polling
+     * and is in the middle of a request-response cycle).
+     *
+     * @return self
+     * @public
+     */
+    public get volatile(): BroadcastOperator<EmitEvents> {
+        return this.sockets.volatile
+    }
+
+    /**
+     * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
+     *
+     * @return self
+     * @public
+     */
+    public get local(): BroadcastOperator<EmitEvents> {
+        return this.sockets.local
+    }
+
+    /**
+     * Returns the matching socket instances
+     *
+     * @public
+     */
+    public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
+        return this.sockets.fetchSockets()
+    }
+
+    /**
+     * Makes the matching socket instances join the specified rooms
+     *
+     * @param room
+     * @public
+     */
+    public socketsJoin(room: Room | Room[]): void {
+        return this.sockets.socketsJoin(room)
+    }
+
+    /**
+     * Makes the matching socket instances leave the specified rooms
+     *
+     * @param room
+     * @public
+     */
+    public socketsLeave(room: Room | Room[]): void {
+        return this.sockets.socketsLeave(room)
+    }
+
+    /**
+     * Makes the matching socket instances disconnect
+     *
+     * @param close - whether to close the underlying connection
+     * @public
+     */
+    public disconnectSockets(close: boolean = false): void {
+        return this.sockets.disconnectSockets(close)
+    }
+}
+
+/**
+ * Expose main namespace (/).
+ */
+
+const emitterMethods = Object.keys(EventEmitter.prototype).filter(function (
+    key
+) {
+    return typeof EventEmitter.prototype[key] === "function"
+})
+
+emitterMethods.forEach(function (fn) {
+    Server.prototype[fn] = function () {
+        return this.sockets[fn].apply(this.sockets, arguments)
+    }
+})
+
+export { Socket, ServerOptions, Namespace, BroadcastOperator, RemoteSocket }
diff --git a/packages/websocket/src/socket.io/namespace.ts b/packages/websocket/src/socket.io/namespace.ts
new file mode 100644
index 00000000..a0242e88
--- /dev/null
+++ b/packages/websocket/src/socket.io/namespace.ts
@@ -0,0 +1,407 @@
+
+import { Socket } from "./socket"
+import type { Server } from "./index"
+import {
+    EventParams,
+    EventNames,
+    EventsMap,
+    StrictEventEmitter,
+    DefaultEventsMap,
+} from "./typed-events"
+import type { Client } from "./client"
+// import debugModule from "debug"
+// import type { Adapter, Room, SocketId } from "socket.io-adapter"
+import type { Adapter, Room, SocketId } from "../socket.io-adapter"
+import { BroadcastOperator, RemoteSocket } from "./broadcast-operator"
+
+// const debug = debugModule("socket.io:namespace");
+
+export interface ExtendedError extends Error {
+    data?: any
+}
+
+export interface NamespaceReservedEventsMap<
+    ListenEvents extends EventsMap,
+    EmitEvents extends EventsMap,
+    ServerSideEvents extends EventsMap
+    > {
+    connect: (socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>) => void
+    connection: (
+        socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>
+    ) => void
+}
+
+export interface ServerReservedEventsMap<
+    ListenEvents,
+    EmitEvents,
+    ServerSideEvents
+    > extends NamespaceReservedEventsMap<
+    ListenEvents,
+    EmitEvents,
+    ServerSideEvents
+    > {
+    new_namespace: (
+        namespace: Namespace<ListenEvents, EmitEvents, ServerSideEvents>
+    ) => void
+}
+
+export const RESERVED_EVENTS: ReadonlySet<string | Symbol> = new Set<
+    keyof ServerReservedEventsMap<never, never, never>
+>(<const>["connect", "connection", "new_namespace"])
+
+export class Namespace<
+    ListenEvents extends EventsMap = DefaultEventsMap,
+    EmitEvents extends EventsMap = ListenEvents,
+    ServerSideEvents extends EventsMap = DefaultEventsMap
+    > extends StrictEventEmitter<
+    ServerSideEvents,
+    EmitEvents,
+    NamespaceReservedEventsMap<ListenEvents, EmitEvents, ServerSideEvents>
+    > {
+    public readonly name: string
+    public readonly sockets: Map<
+        SocketId,
+        Socket<ListenEvents, EmitEvents, ServerSideEvents>
+    > = new Map();
+
+    public adapter: Adapter
+
+    /** @private */
+    readonly server: Server<ListenEvents, EmitEvents, ServerSideEvents>
+
+    /** @private */
+    _fns: Array<
+        (
+            socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
+            next: (err?: ExtendedError) => void
+        ) => void
+    > = [];
+
+    /** @private */
+    _ids: number = 0;
+
+    /**
+     * Namespace constructor.
+     *
+     * @param server instance
+     * @param name
+     */
+    constructor(
+        server: Server<ListenEvents, EmitEvents, ServerSideEvents>,
+        name: string
+    ) {
+        super()
+        this.server = server
+        this.name = name
+        this._initAdapter()
+    }
+
+    /**
+     * Initializes the `Adapter` for this nsp.
+     * Run upon changing adapter by `Server#adapter`
+     * in addition to the constructor.
+     *
+     * @private
+     */
+    _initAdapter() {
+        // @ts-ignore
+        this.adapter = new (this.server.adapter()!)(this)
+    }
+
+    /**
+     * Sets up namespace middleware.
+     *
+     * @return self
+     * @public
+     */
+    public use(
+        fn: (
+            socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
+            next: (err?: ExtendedError) => void
+        ) => void
+    ): this {
+        this._fns.push(fn)
+        return this
+    }
+
+    /**
+     * Executes the middleware for an incoming client.
+     *
+     * @param socket - the socket that will get added
+     * @param fn - last fn call in the middleware
+     * @private
+     */
+    private run(
+        socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>,
+        fn: (err: ExtendedError | null) => void
+    ) {
+        const fns = this._fns.slice(0)
+        if (!fns.length) return fn(null)
+
+        function run(i: number) {
+            fns[i](socket, function (err) {
+                // upon error, short-circuit
+                if (err) return fn(err)
+
+                // if no middleware left, summon callback
+                if (!fns[i + 1]) return fn(null)
+
+                // go on to next
+                run(i + 1)
+            })
+        }
+
+        run(0)
+    }
+
+    /**
+     * Targets a room when emitting.
+     *
+     * @param room
+     * @return self
+     * @public
+     */
+    public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+        return new BroadcastOperator(this.adapter).to(room)
+    }
+
+    /**
+     * Targets a room when emitting.
+     *
+     * @param room
+     * @return self
+     * @public
+     */
+    public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+        return new BroadcastOperator(this.adapter).in(room)
+    }
+
+    /**
+     * Excludes a room when emitting.
+     *
+     * @param room
+     * @return self
+     * @public
+     */
+    public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+        return new BroadcastOperator(this.adapter).except(room)
+    }
+
+    /**
+     * Adds a new client.
+     *
+     * @return {Socket}
+     * @private
+     */
+    _add(
+        client: Client<ListenEvents, EmitEvents, ServerSideEvents>,
+        query,
+        fn?: (socket: Socket) => void
+    ): Socket<ListenEvents, EmitEvents, ServerSideEvents> {
+        const socket = new Socket(this, client, query || {})
+        console.debug(`socket.io namespace client ${client.id} adding socket ${socket.id} to nsp ${this.name}`)
+        this.run(socket, err => {
+            process.nextTick(() => {
+                if ("open" == client.conn.readyState) {
+                    if (err) {
+                        if (client.conn.protocol === 3) {
+                            return socket._error(err.data || err.message)
+                        } else {
+                            return socket._error({
+                                message: err.message,
+                                data: err.data,
+                            })
+                        }
+                    }
+
+                    // track socket
+                    this.sockets.set(socket.id, socket)
+                    console.debug(`socket.io namespace ${this.name} track client ${client.id} socket ${socket.id}`)
+
+                    // it's paramount that the internal `onconnect` logic
+                    // fires before user-set events to prevent state order
+                    // violations (such as a disconnection before the connection
+                    // logic is complete)
+                    socket._onconnect()
+                    // @java-patch multi thread need direct callback socket
+                    if (fn) fn(socket)
+
+                    // fire user-set events
+                    this.emitReserved("connect", socket)
+                    this.emitReserved("connection", socket)
+                } else {
+                    console.debug(`next called after client ${client.id} was closed - ignoring socket`)
+                }
+            })
+        })
+        return socket
+    }
+
+    /**
+     * Removes a client. Called by each `Socket`.
+     *
+     * @private
+     */
+    _remove(socket: Socket<ListenEvents, EmitEvents, ServerSideEvents>): void {
+        if (this.sockets.has(socket.id)) {
+            console.debug(`namespace ${this.name} remove socket ${socket.id}`)
+            this.sockets.delete(socket.id)
+        } else {
+            console.debug(`namespace ${this.name} ignoring remove for ${socket.id}`)
+        }
+    }
+
+    /**
+     * Emits to all clients.
+     *
+     * @return Always true
+     * @public
+     */
+    public emit<Ev extends EventNames<EmitEvents>>(
+        ev: Ev,
+        ...args: EventParams<EmitEvents, Ev>
+    ): boolean {
+        return new BroadcastOperator<EmitEvents>(this.adapter).emit(ev, ...args)
+    }
+
+    /**
+     * Sends a `message` event to all clients.
+     *
+     * @return self
+     * @public
+     */
+    public send(...args: EventParams<EmitEvents, "message">): this {
+        this.emit("message", ...args)
+        return this
+    }
+
+    /**
+     * Sends a `message` event to all clients.
+     *
+     * @return self
+     * @public
+     */
+    public write(...args: EventParams<EmitEvents, "message">): this {
+        this.emit("message", ...args)
+        return this
+    }
+
+    /**
+     * Emit a packet to other Socket.IO servers
+     *
+     * @param ev - the event name
+     * @param args - an array of arguments, which may include an acknowledgement callback at the end
+     * @public
+     */
+    public serverSideEmit<Ev extends EventNames<ServerSideEvents>>(
+        ev: Ev,
+        ...args: EventParams<ServerSideEvents, Ev>
+    ): boolean {
+        if (RESERVED_EVENTS.has(ev)) {
+            throw new Error(`"${ev}" is a reserved event name`)
+        }
+        args.unshift(ev)
+        this.adapter.serverSideEmit(args)
+        return true
+    }
+
+    /**
+     * Called when a packet is received from another Socket.IO server
+     *
+     * @param args - an array of arguments, which may include an acknowledgement callback at the end
+     *
+     * @private
+     */
+    _onServerSideEmit(args: [string, ...any[]]) {
+        super.emitUntyped.apply(this, args)
+    }
+
+    /**
+     * Gets a list of clients.
+     *
+     * @return self
+     * @public
+     */
+    public allSockets(): Promise<Set<SocketId>> {
+        return new BroadcastOperator(this.adapter).allSockets()
+    }
+
+    /**
+    * Sets the compress flag.
+    *
+    * @param compress - if `true`, compresses the sending data
+    * @return self
+    * @public
+    */
+    public compress(compress: boolean): BroadcastOperator<EmitEvents> {
+        return new BroadcastOperator(this.adapter).compress(compress)
+    }
+
+    /**
+     * Sets a modifier for a subsequent event emission that the event data may be lost if the client is not ready to
+     * receive messages (because of network slowness or other issues, or because they’re connected through long polling
+     * and is in the middle of a request-response cycle).
+     *
+     * @return self
+     * @public
+     */
+    public get volatile(): BroadcastOperator<EmitEvents> {
+        return new BroadcastOperator(this.adapter).volatile
+    }
+
+    /**
+     * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
+     *
+     * @return self
+     * @public
+     */
+    public get local(): BroadcastOperator<EmitEvents> {
+        return new BroadcastOperator(this.adapter).local
+    }
+
+    /**
+     * Returns the matching socket instances
+     *
+     * @public
+     */
+    public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
+        return new BroadcastOperator(this.adapter).fetchSockets()
+    }
+
+    /**
+     * Makes the matching socket instances join the specified rooms
+     *
+     * @param room
+     * @public
+     */
+    public socketsJoin(room: Room | Room[]): void {
+        return new BroadcastOperator(this.adapter).socketsJoin(room)
+    }
+
+    /**
+     * Makes the matching socket instances leave the specified rooms
+     *
+     * @param room
+     * @public
+     */
+    public socketsLeave(room: Room | Room[]): void {
+        return new BroadcastOperator(this.adapter).socketsLeave(room)
+    }
+
+    /**
+     * Makes the matching socket instances disconnect
+     *
+     * @param close - whether to close the underlying connection
+     * @public
+     */
+    public disconnectSockets(close: boolean = false): void {
+        return new BroadcastOperator(this.adapter).disconnectSockets(close)
+    }
+
+    public close() {
+        RESERVED_EVENTS.forEach(event => this.removeAllListeners(event as any))
+        this.server._nsps.delete(this.name)
+        // @java-patch close all socket when namespace close
+        this.sockets.forEach(socket => socket._onclose(`namepsace ${this.name} close`))
+    }
+}
diff --git a/packages/websocket/src/socket.io/parent-namespace.ts b/packages/websocket/src/socket.io/parent-namespace.ts
new file mode 100644
index 00000000..9a5c01ab
--- /dev/null
+++ b/packages/websocket/src/socket.io/parent-namespace.ts
@@ -0,0 +1,72 @@
+import { Namespace } from "./namespace"
+import type { Server } from "./index"
+import type {
+    EventParams,
+    EventNames,
+    EventsMap,
+    DefaultEventsMap,
+} from "./typed-events"
+// import type { BroadcastOptions } from "socket.io-adapter"
+import type { BroadcastOptions } from "../socket.io-adapter"
+
+export class ParentNamespace<
+    ListenEvents extends EventsMap = DefaultEventsMap,
+    EmitEvents extends EventsMap = ListenEvents,
+    ServerSideEvents extends EventsMap = DefaultEventsMap
+    > extends Namespace<ListenEvents, EmitEvents, ServerSideEvents> {
+    private static count: number = 0;
+    private children: Set<Namespace<ListenEvents, EmitEvents, ServerSideEvents>> = new Set();
+
+    constructor(server: Server<ListenEvents, EmitEvents, ServerSideEvents>) {
+        super(server, "/_" + ParentNamespace.count++)
+    }
+
+    _initAdapter() {
+        const broadcast = (packet: any, opts: BroadcastOptions) => {
+            this.children.forEach((nsp) => {
+                nsp.adapter.broadcast(packet, opts)
+            })
+        }
+        // @ts-ignore FIXME is there a way to declare an inner class in TypeScript?
+        this.adapter = { broadcast }
+    }
+
+    public emit<Ev extends EventNames<EmitEvents>>(
+        ev: Ev,
+        ...args: EventParams<EmitEvents, Ev>
+    ): boolean {
+        this.children.forEach((nsp) => {
+            nsp.emit(ev, ...args)
+        })
+
+        return true
+    }
+
+    // public emit(...args: any[]): boolean {
+    //     this.children.forEach(nsp => {
+    //         nsp._rooms = this._rooms
+    //         nsp._flags = this._flags
+    //         nsp.emit.apply(nsp, args as any)
+    //     })
+    //     this._rooms.clear()
+    //     this._flags = {}
+
+    //     return true
+    // }
+
+    createChild(
+        name: string
+    ): Namespace<ListenEvents, EmitEvents, ServerSideEvents> {
+        const namespace = new Namespace(this.server, name)
+        namespace._fns = this._fns.slice(0)
+        this.listeners("connect").forEach((listener) =>
+            namespace.on("connect", listener)
+        )
+        this.listeners("connection").forEach((listener) =>
+            namespace.on("connection", listener)
+        )
+        this.children.add(namespace)
+        this.server._nsps.set(name, namespace)
+        return namespace
+    }
+}
diff --git a/packages/websocket/src/socket.io/socket.ts b/packages/websocket/src/socket.io/socket.ts
new file mode 100644
index 00000000..a9804a9a
--- /dev/null
+++ b/packages/websocket/src/socket.io/socket.ts
@@ -0,0 +1,727 @@
+
+import { Packet, PacketType } from "../socket.io-parser"
+import url = require("url")
+// import debugModule from "debug"
+import type { Server } from "./index"
+import {
+    EventParams,
+    EventNames,
+    EventsMap,
+    StrictEventEmitter,
+    DefaultEventsMap,
+} from "./typed-events"
+import type { Client } from "./client"
+import type { Namespace, NamespaceReservedEventsMap } from "./namespace"
+// import type { IncomingMessage, IncomingHttpHeaders } from "http"
+import type {
+    Adapter,
+    BroadcastFlags,
+    Room,
+    SocketId,
+} from "socket.io-adapter"
+// import base64id from "base64id"
+import type { ParsedUrlQuery } from "querystring"
+import { BroadcastOperator } from "./broadcast-operator"
+
+// const debug = debugModule("socket.io:socket");
+
+type ClientReservedEvents = "connect_error"
+
+export interface SocketReservedEventsMap {
+    disconnect: (reason: string) => void
+    disconnecting: (reason: string) => void
+    error: (err: Error) => void
+}
+
+// EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
+export interface EventEmitterReservedEventsMap {
+    newListener: (
+        eventName: string | Symbol,
+        listener: (...args: any[]) => void
+    ) => void
+    removeListener: (
+        eventName: string | Symbol,
+        listener: (...args: any[]) => void
+    ) => void
+}
+
+export const RESERVED_EVENTS: ReadonlySet<string | Symbol> = new Set<
+    | ClientReservedEvents
+    | keyof NamespaceReservedEventsMap<never, never, never>
+    | keyof SocketReservedEventsMap
+    | keyof EventEmitterReservedEventsMap
+>(<const>[
+    "connect",
+    "connect_error",
+    "disconnect",
+    "disconnecting",
+    "newListener",
+    "removeListener",
+])
+
+/**
+ * The handshake details
+ */
+export interface Handshake {
+    /**
+     * The headers sent as part of the handshake
+     */
+    headers: any//IncomingHttpHeaders
+
+    /**
+     * The date of creation (as string)
+     */
+    time: string
+
+    /**
+     * The ip of the client
+     */
+    address: string
+
+    /**
+     * Whether the connection is cross-domain
+     */
+    xdomain: boolean
+
+    /**
+     * Whether the connection is secure
+     */
+    secure: boolean
+
+    /**
+     * The date of creation (as unix timestamp)
+     */
+    issued: number
+
+    /**
+     * The request URL string
+     */
+    url: string
+
+    /**
+     * The query object
+     */
+    query: ParsedUrlQuery
+
+    /**
+     * The auth object
+     */
+    auth: { [key: string]: any }
+}
+
+export class Socket<
+    ListenEvents extends EventsMap = DefaultEventsMap,
+    EmitEvents extends EventsMap = ListenEvents,
+    ServerSideEvents extends EventsMap = DefaultEventsMap
+    > extends StrictEventEmitter<
+    ListenEvents,
+    EmitEvents,
+    SocketReservedEventsMap
+    > {
+    public readonly id: SocketId
+    public readonly handshake: Handshake
+
+    /**
+     * Additional information that can be attached to the Socket instance and which will be used in the fetchSockets method
+     */
+    public data: any = {};
+
+    public connected: boolean
+    public disconnected: boolean
+
+    private readonly server: Server<ListenEvents, EmitEvents, ServerSideEvents>
+    private readonly adapter: Adapter
+    private acks: Map<number, () => void> = new Map();
+    private fns: Array<(event: Array<any>, next: (err?: Error) => void) => void> =
+        [];
+    private flags: BroadcastFlags = {};
+    private _anyListeners?: Array<(...args: any[]) => void>
+
+    /**
+     * Interface to a `Client` for a given `Namespace`.
+     *
+     * @param {Namespace} nsp
+     * @param {Client} client
+     * @param {Object} auth
+     * @package
+     */
+    constructor(
+        readonly nsp: Namespace<ListenEvents, EmitEvents, ServerSideEvents>,
+        readonly client: Client<ListenEvents, EmitEvents, ServerSideEvents>,
+        auth: object
+    ) {
+        super()
+        this.nsp = nsp
+        this.server = nsp.server
+        this.adapter = this.nsp.adapter
+        // if (client.conn.protocol === 3) {
+        //     // @ts-ignore
+        this.id = nsp.name !== "/" ? nsp.name + "#" + client.id : client.id
+        // } else {
+        //     this.id = base64id.generateId() // don't reuse the Engine.IO id because it's sensitive information
+        // }
+        this.client = client
+        this.acks = new Map()
+        this.connected = true
+        this.disconnected = false
+        this.handshake = this.buildHandshake(auth)
+    }
+
+    buildHandshake(auth): Handshake {
+        return {
+            headers: this.request.headers,
+            time: new Date() + "",
+            address: this.conn.remoteAddress,
+            xdomain: !!this.request.headers.origin,
+            // @ts-ignore
+            secure: !!this.request.connection.encrypted,
+            issued: +new Date(),
+            url: this.request.url!,
+            query: url.parse(this.request.url!, true).query,
+            auth,
+        }
+    }
+
+    /**
+     * Emits to this client.
+     *
+     * @return Always returns `true`.
+     * @public
+     */
+    public emit<Ev extends EventNames<EmitEvents>>(
+        ev: Ev,
+        ...args: EventParams<EmitEvents, Ev>
+    ): boolean {
+        if (RESERVED_EVENTS.has(ev)) {
+            throw new Error(`"${ev}" is a reserved event name`)
+        }
+        const data: any[] = [ev, ...args]
+        const packet: any = {
+            type: PacketType.EVENT,
+            data: data,
+        }
+
+        // access last argument to see if it's an ACK callback
+        if (typeof data[data.length - 1] === "function") {
+            console.trace("emitting packet with ack id %d", this.nsp._ids)
+            this.acks.set(this.nsp._ids, data.pop())
+            packet.id = this.nsp._ids++
+        }
+
+        const flags = Object.assign({}, this.flags)
+        this.flags = {}
+
+        this.packet(packet, flags)
+
+        return true
+    }
+
+    /**
+     * Targets a room when broadcasting.
+     *
+     * @param room
+     * @return self
+     * @public
+     */
+    public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+        return this.newBroadcastOperator().to(room)
+    }
+
+    /**
+     * Targets a room when broadcasting.
+     *
+     * @param room
+     * @return self
+     * @public
+     */
+    public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+        return this.newBroadcastOperator().in(room)
+    }
+
+    /**
+     * Excludes a room when broadcasting.
+     *
+     * @param room
+     * @return self
+     * @public
+     */
+    public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
+        return this.newBroadcastOperator().except(room)
+    }
+
+    /**
+     * Sends a `message` event.
+     *
+     * @return self
+     * @public
+     */
+    public send(...args: EventParams<EmitEvents, "message">): this {
+        this.emit("message", ...args)
+        return this
+    }
+
+    /**
+     * Sends a `message` event.
+     *
+     * @return self
+     * @public
+     */
+    public write(...args: EventParams<EmitEvents, "message">): this {
+        this.emit("message", ...args)
+        return this
+    }
+
+    /**
+     * Writes a packet.
+     *
+     * @param {Object} packet - packet object
+     * @param {Object} opts - options
+     * @private
+     */
+    private packet(
+        packet: Omit<Packet, "nsp"> & Partial<Pick<Packet, "nsp">>,
+        opts: any = {}
+    ): void {
+        packet.nsp = this.nsp.name
+        opts.compress = false !== opts.compress
+        this.client._packet(packet as Packet, opts)
+    }
+
+    /**
+     * Joins a room.
+     *
+     * @param {String|Array} rooms - room or array of rooms
+     * @return a Promise or nothing, depending on the adapter
+     * @public
+     */
+    public join(rooms: Room | Array<Room>): Promise<void> | void {
+        console.debug(`join room ${rooms}`)
+
+        return this.adapter.addAll(
+            this.id,
+            new Set(Array.isArray(rooms) ? rooms : [rooms])
+        )
+    }
+
+    /**
+     * Leaves a room.
+     *
+     * @param {String} room
+     * @return a Promise or nothing, depending on the adapter
+     * @public
+     */
+    public leave(room: string): Promise<void> | void {
+        console.debug(`leave room ${room}`)
+
+        return this.adapter.del(this.id, room)
+    }
+
+    /**
+     * Leave all rooms.
+     *
+     * @private
+     */
+    private leaveAll(): void {
+        this.adapter.delAll(this.id)
+    }
+
+    /**
+     * Called by `Namespace` upon successful
+     * middleware execution (ie: authorization).
+     * Socket is added to namespace array before
+     * call to join, so adapters can access it.
+     *
+     * @private
+     */
+    _onconnect(): void {
+        console.debug(`socket ${this.id} connected - writing packet`)
+        this.join(this.id)
+        if (this.conn.protocol === 3) {
+            this.packet({ type: PacketType.CONNECT })
+        } else {
+            this.packet({ type: PacketType.CONNECT, data: { sid: this.id } })
+        }
+    }
+
+    /**
+     * Called with each packet. Called by `Client`.
+     *
+     * @param {Object} packet
+     * @private
+     */
+    _onpacket(packet: Packet): void {
+        console.trace("got packet", JSON.stringify(packet))
+        switch (packet.type) {
+            case PacketType.EVENT:
+                this.onevent(packet)
+                break
+
+            case PacketType.BINARY_EVENT:
+                this.onevent(packet)
+                break
+
+            case PacketType.ACK:
+                this.onack(packet)
+                break
+
+            case PacketType.BINARY_ACK:
+                this.onack(packet)
+                break
+
+            case PacketType.DISCONNECT:
+                this.ondisconnect()
+                break
+
+            case PacketType.CONNECT_ERROR:
+                this._onerror(new Error(packet.data))
+        }
+    }
+
+    /**
+     * Called upon event packet.
+     *
+     * @param {Packet} packet - packet object
+     * @private
+     */
+    private onevent(packet: Packet): void {
+        const args = packet.data || []
+        console.trace("emitting event", JSON.stringify(args))
+
+        if (null != packet.id) {
+            console.trace("attaching ack callback to event")
+            args.push(this.ack(packet.id))
+        }
+
+        if (this._anyListeners && this._anyListeners.length) {
+            const listeners = this._anyListeners.slice()
+            for (const listener of listeners) {
+                listener.apply(this, args)
+            }
+        }
+        this.dispatch(args)
+    }
+
+    /**
+     * Produces an ack callback to emit with an event.
+     *
+     * @param {Number} id - packet id
+     * @private
+     */
+    private ack(id: number): () => void {
+        const self = this
+        let sent = false
+        return function () {
+            // prevent double callbacks
+            if (sent) return
+            const args = Array.prototype.slice.call(arguments)
+            console.trace("sending ack", JSON.stringify(args))
+
+            self.packet({
+                id: id,
+                type: PacketType.ACK,
+                data: args,
+            })
+
+            sent = true
+        }
+    }
+
+    /**
+     * Called upon ack packet.
+     *
+     * @private
+     */
+    private onack(packet: Packet): void {
+        const ack = this.acks.get(packet.id!)
+        if ("function" == typeof ack) {
+            console.trace(`socket ${this.id} calling ack ${packet.id} with ${packet.data}`)
+            ack.apply(this, packet.data)
+            this.acks.delete(packet.id!)
+        } else {
+            console.debug(`socket ${this.id} bad ack`, packet.id)
+        }
+    }
+
+    /**
+     * Called upon client disconnect packet.
+     *
+     * @private
+     */
+    private ondisconnect(): void {
+        console.debug(`socket ${this.id} got disconnect packet`)
+        this._onclose("client namespace disconnect")
+    }
+
+    /**
+     * Handles a client error.
+     *
+     * @private
+     */
+    _onerror(err: Error): void {
+        if (this.listeners("error").length) {
+            this.emitReserved("error", err)
+        } else {
+            console.error("Missing error handler on `socket`.")
+            console.error(err.stack)
+        }
+    }
+
+    /**
+     * Called upon closing. Called by `Client`.
+     *
+     * @param {String} reason
+     * @throw {Error} optional error object
+     *
+     * @private
+     */
+    _onclose(reason: string): this | undefined {
+        if (!this.connected) return this
+        console.debug(`closing socket ${this.id} - reason: ${reason}`)
+        this.emitReserved("disconnecting", reason)
+        this.leaveAll()
+        this.nsp._remove(this)
+        this.client._remove(this)
+        this.connected = false
+        this.disconnected = true
+        this.emitReserved("disconnect", reason)
+        return
+    }
+
+    /**
+     * Produces an `error` packet.
+     *
+     * @param {Object} err - error object
+     *
+     * @private
+     */
+    _error(err): void {
+        this.packet({ type: PacketType.CONNECT_ERROR, data: err })
+    }
+
+    /**
+     * Disconnects this client.
+     *
+     * @param {Boolean} close - if `true`, closes the underlying connection
+     * @return {Socket} self
+     *
+     * @public
+     */
+    public disconnect(close = false): this {
+        if (!this.connected) return this
+        if (close) {
+            this.client._disconnect()
+        } else {
+            this.packet({ type: PacketType.DISCONNECT })
+            this._onclose("server namespace disconnect")
+        }
+        return this
+    }
+
+    /**
+     * Sets the compress flag.
+     *
+     * @param {Boolean} compress - if `true`, compresses the sending data
+     * @return {Socket} self
+     * @public
+     */
+    public compress(compress: boolean): this {
+        this.flags.compress = compress
+        return this
+    }
+
+    /**
+   * Sets a modifier for a subsequent event emission that the event data may be lost if the client is not ready to
+   * receive messages (because of network slowness or other issues, or because they’re connected through long polling
+   * and is in the middle of a request-response cycle).
+   *
+   * @return {Socket} self
+   * @public
+   */
+    public get volatile(): this {
+        this.flags.volatile = true
+        return this
+    }
+
+    /**
+     * Sets a modifier for a subsequent event emission that the event data will only be broadcast to every sockets but the
+     * sender.
+     *
+     * @return {Socket} self
+     * @public
+     */
+    public get broadcast(): BroadcastOperator<EmitEvents> {
+        return this.newBroadcastOperator()
+    }
+
+    /**
+     * Sets a modifier for a subsequent event emission that the event data will only be broadcast to the current node.
+     *
+     * @return {Socket} self
+     * @public
+     */
+    public get local(): BroadcastOperator<EmitEvents> {
+        return this.newBroadcastOperator().local
+    }
+
+    /**
+     * Dispatch incoming event to socket listeners.
+     *
+     * @param {Array} event - event that will get emitted
+     * @private
+     */
+    private dispatch(event: [eventName: string, ...args: any[]]): void {
+        console.trace("dispatching an event", JSON.stringify(event))
+        this.run(event, (err) => {
+            process.nextTick(() => {
+                if (err) {
+                    return this._onerror(err)
+                }
+                if (this.connected) {
+                    super.emitUntyped.apply(this, event)
+                } else {
+                    console.debug("ignore packet received after disconnection")
+                }
+            })
+        })
+    }
+
+    /**
+     * Sets up socket middleware.
+     *
+     * @param {Function} fn - middleware function (event, next)
+     * @return {Socket} self
+     * @public
+     */
+    public use(
+        fn: (event: Array<any>, next: (err?: Error) => void) => void
+    ): this {
+        this.fns.push(fn)
+        return this
+    }
+
+    /**
+     * Executes the middleware for an incoming event.
+     *
+     * @param {Array} event - event that will get emitted
+     * @param {Function} fn - last fn call in the middleware
+     * @private
+     */
+    private run(
+        event: [eventName: string, ...args: any[]],
+        fn: (err: Error | null) => void
+    ): void {
+        const fns = this.fns.slice(0)
+        if (!fns.length) return fn(null)
+
+        function run(i: number) {
+            fns[i](event, function (err) {
+                // upon error, short-circuit
+                if (err) return fn(err)
+
+                // if no middleware left, summon callback
+                if (!fns[i + 1]) return fn(null)
+
+                // go on to next
+                run(i + 1)
+            })
+        }
+
+        run(0)
+    }
+
+    /**
+     * A reference to the request that originated the underlying Engine.IO Socket.
+     *
+     * @public
+     */
+    public get request(): any /** IncomingMessage */ {
+        return this.client.request
+    }
+
+    /**
+     * A reference to the underlying Client transport connection (Engine.IO Socket object).
+     *
+     * @public
+     */
+    public get conn() {
+        return this.client.conn
+    }
+
+    /**
+     * @public
+     */
+    public get rooms(): Set<Room> {
+        return this.adapter.socketRooms(this.id) || new Set()
+    }
+
+    /**
+     * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
+     * callback.
+     *
+     * @param listener
+     * @public
+     */
+    public onAny(listener: (...args: any[]) => void): this {
+        this._anyListeners = this._anyListeners || []
+        this._anyListeners.push(listener)
+        return this
+    }
+
+    /**
+     * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
+     * callback. The listener is added to the beginning of the listeners array.
+     *
+     * @param listener
+     * @public
+     */
+    public prependAny(listener: (...args: any[]) => void): this {
+        this._anyListeners = this._anyListeners || []
+        this._anyListeners.unshift(listener)
+        return this
+    }
+
+    /**
+     * Removes the listener that will be fired when any event is emitted.
+     *
+     * @param listener
+     * @public
+     */
+    public offAny(listener?: (...args: any[]) => void): this {
+        if (!this._anyListeners) {
+            return this
+        }
+        if (listener) {
+            const listeners = this._anyListeners
+            for (let i = 0; i < listeners.length; i++) {
+                if (listener === listeners[i]) {
+                    listeners.splice(i, 1)
+                    return this
+                }
+            }
+        } else {
+            this._anyListeners = []
+        }
+        return this
+    }
+
+    /**
+     * Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,
+     * e.g. to remove listeners.
+     *
+     * @public
+     */
+    public listenersAny() {
+        return this._anyListeners || []
+    }
+
+    private newBroadcastOperator(): BroadcastOperator<EmitEvents> {
+        const flags = Object.assign({}, this.flags)
+        this.flags = {}
+        return new BroadcastOperator(
+            this.adapter,
+            new Set<Room>(),
+            new Set<Room>([this.id]),
+            flags
+        )
+    }
+}
diff --git a/packages/websocket/src/socket.io/typed-events.ts b/packages/websocket/src/socket.io/typed-events.ts
new file mode 100644
index 00000000..c1d48c10
--- /dev/null
+++ b/packages/websocket/src/socket.io/typed-events.ts
@@ -0,0 +1,180 @@
+import { EventEmitter } from "events"
+
+/**
+ * An events map is an interface that maps event names to their value, which
+ * represents the type of the `on` listener.
+ */
+export interface EventsMap {
+    [event: string]: any
+}
+
+/**
+ * The default events map, used if no EventsMap is given. Using this EventsMap
+ * is equivalent to accepting all event names, and any data.
+ */
+export interface DefaultEventsMap {
+    [event: string]: (...args: any[]) => void
+}
+
+/**
+ * Returns a union type containing all the keys of an event map.
+ */
+export type EventNames<Map extends EventsMap> = keyof Map & (string | symbol)
+
+/** The tuple type representing the parameters of an event listener */
+export type EventParams<
+    Map extends EventsMap,
+    Ev extends EventNames<Map>
+    > = Parameters<Map[Ev]>
+
+/**
+ * The event names that are either in ReservedEvents or in UserEvents
+ */
+export type ReservedOrUserEventNames<
+    ReservedEventsMap extends EventsMap,
+    UserEvents extends EventsMap
+    > = EventNames<ReservedEventsMap> | EventNames<UserEvents>
+
+/**
+ * Type of a listener of a user event or a reserved event. If `Ev` is in
+ * `ReservedEvents`, the reserved event listener is returned.
+ */
+export type ReservedOrUserListener<
+    ReservedEvents extends EventsMap,
+    UserEvents extends EventsMap,
+    Ev extends ReservedOrUserEventNames<ReservedEvents, UserEvents>
+    > = FallbackToUntypedListener<
+        Ev extends EventNames<ReservedEvents>
+        ? ReservedEvents[Ev]
+        : Ev extends EventNames<UserEvents>
+        ? UserEvents[Ev]
+        : never
+    >
+
+/**
+ * Returns an untyped listener type if `T` is `never`; otherwise, returns `T`.
+ *
+ * This is a hack to mitigate https://github.com/socketio/socket.io/issues/3833.
+ * Needed because of https://github.com/microsoft/TypeScript/issues/41778
+ */
+type FallbackToUntypedListener<T> = [T] extends [never]
+    ? (...args: any[]) => void
+    : T
+
+/**
+ * Interface for classes that aren't `EventEmitter`s, but still expose a
+ * strictly typed `emit` method.
+ */
+export interface TypedEventBroadcaster<EmitEvents extends EventsMap> {
+    emit<Ev extends EventNames<EmitEvents>>(
+        ev: Ev,
+        ...args: EventParams<EmitEvents, Ev>
+    ): boolean
+}
+
+/**
+ * Strictly typed version of an `EventEmitter`. A `TypedEventEmitter` takes type
+ * parameters for mappings of event names to event data types, and strictly
+ * types method calls to the `EventEmitter` according to these event maps.
+ *
+ * @typeParam ListenEvents - `EventsMap` of user-defined events that can be
+ * listened to with `on` or `once`
+ * @typeParam EmitEvents - `EventsMap` of user-defined events that can be
+ * emitted with `emit`
+ * @typeParam ReservedEvents - `EventsMap` of reserved events, that can be
+ * emitted by socket.io with `emitReserved`, and can be listened to with
+ * `listen`.
+ */
+export abstract class StrictEventEmitter<
+    ListenEvents extends EventsMap,
+    EmitEvents extends EventsMap,
+    ReservedEvents extends EventsMap = {}
+    >
+    extends EventEmitter
+    implements TypedEventBroadcaster<EmitEvents>
+{
+    /**
+     * Adds the `listener` function as an event listener for `ev`.
+     *
+     * @param ev Name of the event
+     * @param listener Callback function
+     */
+    on<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(
+        ev: Ev,
+        listener: ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>
+    ): this {
+        return super.on(ev, listener)
+    }
+
+    /**
+     * Adds a one-time `listener` function as an event listener for `ev`.
+     *
+     * @param ev Name of the event
+     * @param listener Callback function
+     */
+    once<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(
+        ev: Ev,
+        listener: ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>
+    ): this {
+        return super.once(ev, listener)
+    }
+
+    /**
+     * Emits an event.
+     *
+     * @param ev Name of the event
+     * @param args Values to send to listeners of this event
+     */
+    emit<Ev extends EventNames<EmitEvents>>(
+        ev: Ev,
+        ...args: EventParams<EmitEvents, Ev>
+    ): boolean {
+        return super.emit(ev, ...args)
+    }
+
+    /**
+     * Emits a reserved event.
+     *
+     * This method is `protected`, so that only a class extending
+     * `StrictEventEmitter` can emit its own reserved events.
+     *
+     * @param ev Reserved event name
+     * @param args Arguments to emit along with the event
+     */
+    protected emitReserved<Ev extends EventNames<ReservedEvents>>(
+        ev: Ev,
+        ...args: EventParams<ReservedEvents, Ev>
+    ): boolean {
+        return super.emit(ev, ...args)
+    }
+
+    /**
+     * Emits an event.
+     *
+     * This method is `protected`, so that only a class extending
+     * `StrictEventEmitter` can get around the strict typing. This is useful for
+     * calling `emit.apply`, which can be called as `emitUntyped.apply`.
+     *
+     * @param ev Event name
+     * @param args Arguments to emit along with the event
+     */
+    protected emitUntyped(ev: string, ...args: any[]): boolean {
+        return super.emit(ev, ...args)
+    }
+
+    /**
+     * Returns the listeners listening to an event.
+     *
+     * @param event Event name
+     * @returns Array of listeners subscribed to `event`
+     */
+    listeners<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(
+        event: Ev
+    ): ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>[] {
+        return super.listeners(event) as ReservedOrUserListener<
+            ReservedEvents,
+            ListenEvents,
+            Ev
+        >[]
+    }
+}
diff --git a/packages/websocket/src/tomcat/client.ts b/packages/websocket/src/tomcat/client.ts
index cf19e8f9..ba1a3263 100644
--- a/packages/websocket/src/tomcat/client.ts
+++ b/packages/websocket/src/tomcat/client.ts
@@ -1,22 +1,24 @@
-import { Transport } from '../transport'
+import { WebSocketClient } from '../server/client'
 
-export class TomcatClient extends Transport {
+export class TomcatClient extends WebSocketClient {
     private session: javax.websocket.Session
 
-    constructor(server: any, session: javax.websocket.Session) {
-        super(server)
-        this.remoteAddress = session + ''
-        this.request = {
-            uri: () => `${session.getRequestURI()}`,
-            headers: () => []
-        }
-        this._id = session.getId() + ''
+    constructor(session: javax.websocket.Session) {
+        super()
+        this.id = session.getId() + ''
         this.session = session
     }
-    doSend(text: string) {
-        Java.synchronized(() => this.session.getBasicRemote().sendText(text), this.session)()
+    send(text: string, opts?: any, callback?: (err?: Error) => void) {
+        Java.synchronized(() => {
+            try {
+                this.session.getBasicRemote().sendText(text)
+                callback?.()
+            } catch (error) {
+                callback?.(error)
+            }
+        }, this.session)()
     }
-    doClose() {
+    close() {
         this.session.close()
     }
 }
diff --git a/packages/websocket/src/tomcat/index.ts b/packages/websocket/src/tomcat/index.ts
index 22e81fd8..7cd65590 100644
--- a/packages/websocket/src/tomcat/index.ts
+++ b/packages/websocket/src/tomcat/index.ts
@@ -1,60 +1,61 @@
-import { EventEmitter } from 'events'
+import { JavaServerOptions, WebSocketServer } from '../server'
+import { Request } from '../server/request'
 
-import { ServerOptions } from '../socket-io'
-import { ServerEvent } from '../socket-io/constants'
-import { ProxyBeanName } from './constants'
 import { TomcatClient } from './client'
+import { ProxyBeanName } from './constants'
 
 const ThreadPoolExecutor = Java.type('java.util.concurrent.ThreadPoolExecutor')
 
 type TomcatWebSocketSession = javax.websocket.Session
 
-class TomcatWebSocketServer extends EventEmitter {
-    private beanFactory: any
+class TomcatWebSocketServer extends WebSocketServer {
     private executor: any
-    private clients: Map<string, any>
 
-    constructor(beanFactory: any, options: ServerOptions) {
-        super()
-        this.clients = new Map()
-        this.beanFactory = beanFactory
+    constructor(beanFactory: any, options: JavaServerOptions) {
+        super(beanFactory, options)
+    }
+
+    protected initialize(): void {
         this.initThreadPool()
-        try { this.beanFactory.destroySingleton(ProxyBeanName) } catch (error) { }
+        try { this.instance.destroySingleton(ProxyBeanName) } catch (error) { }
         let NashornWebSocketServerProxy = Java.extend(Java.type("pw.yumc.MiaoScript.websocket.WebSocketProxy"), {
             onOpen: (session: TomcatWebSocketSession) => {
-                let cid = `${session?.getId()}`
-                let tomcatClient = new TomcatClient(this, session)
-                this.clients.set(cid, tomcatClient)
-                this.emit(ServerEvent.connect, tomcatClient)
+                this.onconnect(session)
             },
             onMessage: (session: TomcatWebSocketSession, message: string) => {
-                let cid = `${session?.getId()}`
-                if (this.clients.has(cid)) {
-                    this.executor.execute(() => this.emit(ServerEvent.message, this.clients.get(cid), message))
-                } else {
-                    console.error(`unknow client ${session} reciver message ${message}`)
-                }
+                this.onmessage(session, message)
             },
             onClose: (session: TomcatWebSocketSession, reason: any) => {
-                let cid = `${session?.getId()}`
-                if (this.clients.has(cid)) {
-                    this.emit(ServerEvent.disconnect, this.clients.get(cid), reason)
-                } else {
-                    console.error(`unknow client ${session} disconnect cause ${reason}`)
-                }
+                this.ondisconnect(session, reason)
             },
             onError: (session: TomcatWebSocketSession, error: Error) => {
-                let cid = `${session?.getId()}`
-                if (this.clients.has(cid)) {
-                    this.emit(ServerEvent.error, this.clients.get(cid), error)
-                } else {
-                    console.error(`unknow client ${session} cause error ${error}`)
-                    console.ex(error)
-                }
+                this.onerror(session, error)
             },
         })
-        this.beanFactory.registerSingleton(ProxyBeanName, new NashornWebSocketServerProxy())
+        this.instance.registerSingleton(ProxyBeanName, new NashornWebSocketServerProxy())
     }
+
+    protected getId(session) {
+        return session?.getId() + ''
+    }
+
+    protected getRequest(session) {
+        let request = new Request(session.getRequestURI(), "GET")
+        request.connection = {
+            remoteAddress: ''
+        }
+        return request
+    }
+
+    protected getSocket(session) {
+        return new TomcatClient(session)
+    }
+
+    protected doClose() {
+        this.instance.destroySingleton(ProxyBeanName)
+        this.executor.shutdown()
+    }
+
     private initThreadPool() {
         const ThreadPoolTaskExecutor = Java.type('org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor')
         this.executor = new ThreadPoolTaskExecutor()
@@ -66,11 +67,6 @@ class TomcatWebSocketServer extends EventEmitter {
         this.executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy())
         this.executor.initialize()
     }
-    close() {
-        this.clients.forEach(client => client.close())
-        this.beanFactory.destroySingleton(ProxyBeanName)
-        this.executor.shutdown()
-    }
 }
 
 export {
diff --git a/packages/websocket/src/transport.ts b/packages/websocket/src/transport.ts
deleted file mode 100644
index 66d96cb1..00000000
--- a/packages/websocket/src/transport.ts
+++ /dev/null
@@ -1,35 +0,0 @@
-import { EventEmitter } from 'events'
-
-export abstract class Transport extends EventEmitter {
-    protected _id: string
-
-    server: any
-    readyState: 'opening' | 'open' | 'closing' | 'closed'
-    remoteAddress: string
-    upgraded: boolean
-    request: any
-
-    constructor(server: any) {
-        super()
-        this.server = server
-        this.readyState = 'open'
-        this.upgraded = true
-    }
-    get id() {
-        return this._id
-    }
-    send(text: string) {
-        if (this.readyState == 'open') {
-            this.doSend(text)
-        } else {
-            console.debug(`send message ${text} to close client ${this._id}`)
-        }
-    }
-    close() {
-        if ("closed" === this.readyState || "closing" === this.readyState) { return }
-        this.doClose()
-        this.readyState = 'closed'
-    }
-    abstract doSend(text: string)
-    abstract doClose()
-}