197 lines
5.8 KiB
Markdown
197 lines
5.8 KiB
Markdown
# Deprecated: 请大佬移步 [https://git.bilibili.co/platform/go-common/tree/master/app/tool/bmproto](https://git.bilibili.co/platform/go-common/tree/master/app/tool/bmproto) 生成的代码不一样但是功能一致, 可以无缝迁移!
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# protoc-gen-bm
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通过 protobuf 自动生成 bm server,统一数据传输模型.
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### 安装
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```bash
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go install go-common/app/tool/protoc-gen-bm
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```
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### 如何生成 bm server 代码 (example)
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```bash
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# 生成 examples/helloworld bm server 代码
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protoc -I. -Ithird_party/googleapis --bm_out=:. examples/helloworld/api/v1/helloworld.proto
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# 使用 jsonpb
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protoc -I. -Ithird_party/googleapis --bm_out=jsonpb=true:. examples/helloworld/api/v1/helloworld.proto
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```
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### 给 protobuf 添加 http 描述示例
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```protobuf
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service Messaging {
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rpc GetMessage(GetMessageRequest) returns (Message) {
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option (google.api.http) = {
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get: "/message";
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};
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}
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}
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message GetMessageRequest {
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string name = 1; // Mapped to URL path.
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}
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message Message {
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string text = 1; // The resource content.
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}
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```
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http 到 gRPC 的映射如下
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| HTTP | gRPC |
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|-------------------------|---------------------------|
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| `GET /message?name=foo` | `GetMessage(name: "foo")` |
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对于 GET 之类不包含 Body 的请求,所有的 Request Message 将被映射到 URL Query 中。
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对于嵌套的字段通过 `.` 分割 例如:
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```protobuf
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service Messaging {
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rpc GetMessage(GetMessageRequest) returns (Message) {
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option (google.api.http) = {
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get:"/messages"
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};
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}
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}
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message GetMessageRequest {
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message SubMessage {
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string subfield = 1;
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}
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string message_id = 1;
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int64 revision = 2;
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SubMessage sub = 3;
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}
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```
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| HTTP | gRPC |
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|---------------------------------------------------------------|---------------------------------------------------------------------------------|
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| `GET /messages?message_id=123456&revision=2&sub.subfield=foo` | `GetMessage(message_id: "123456" revision: 2 sub: SubMessage(subfield: "foo"))` |
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对于包含 Body 的 http 请求,body 字段可以用来指定数据映射
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```protobuf
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service Messaging {
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rpc CreateMessage(CreateMessageRequest) returns (Message) {
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option (google.api.http) = {
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post: "/messages"
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body: "*"
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};
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}
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}
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message CreateMessageRequest {
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string message_id = 1;
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string text = 2;
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}
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```
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| HTTP | gRPC |
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|--------------------------------------------------------------|----------------------------------------------------|
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| `POST /v1/messages {"message_id": "123456", "text": "Hi!" }` | `CreateMessage(message_id: "123456", text: "Hi!")` |
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### Response 响应
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Json Response
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```json
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{
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"code": 0,
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"message": "this is message",
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"data": {// Response Message Marshal as JSON}
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}
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```
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Protobuf Response
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```protobuf
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message PB {
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int64 Code = 1;
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string Message = 2;
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uint64 TTL = 3;
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google.protobuf.Any Data = 4;
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}
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```
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### 与 google.api.http 不一致的地方
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- 因为 bm 不支持 restful 格式 API,所以不支持映射参数到 Path
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- Response 多了层包装,而不是直接返回 message 主体,message 主体被放到 data 中
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### 注意事项
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#### bazel 编译问题
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目前自动生成的 BUILD 的文件无法正常编译,需要手动修改,以 example/helloworld 项目为例,需要对 BUILD 文件进行以下修改
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```diff
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--- a/app/tool/protoc-gen-bm/examples/helloworld/api/v1/BUILD
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+++ b/app/tool/protoc-gen-bm/examples/helloworld/api/v1/BUILD
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@@ -13,8 +13,8 @@ load(
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proto_library(
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name = "v1_proto",
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srcs = ["helloworld.proto"],
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- tags = ["automanaged"],
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- deps = ["google/api/annotations.proto"],
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+ tags = ["manual"],
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+ deps = ["@go_googleapis//google/api:annotations_proto"],
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)
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go_proto_library(
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@@ -22,14 +22,14 @@ go_proto_library(
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compilers = ["@io_bazel_rules_go//proto:go_grpc"],
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importpath = "go-common/app/tool/protoc-gen-bm/examples/helloworld/api/v1",
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proto = ":v1_proto",
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- tags = ["automanaged"],
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- deps = ["google/api/annotations.proto"],
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+ tags = ["manual"],
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+ deps = ["@go_googleapis//google/api:annotations_go_proto"],
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)
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go_library(
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name = "go_default_library",
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srcs = ["helloworld.pb.bm.go"],
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- embed = ["v1_go_proto"],
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+ embed = [":v1_go_proto"],
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importpath = "go-common/app/tool/protoc-gen-bm/examples/helloworld/api/v1",
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tags = ["automanaged"],
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visibility = ["//visibility:public"],
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```
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恩、不解释了,应该都能看懂
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#### 需要自定义 form tag
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因为 blademaster 在 Bind parameters 时默认是大小写敏感的,而且没有自动转换驼峰与下划线,所以在定义 Proto message 时需要用 gogo 自定义一些 tag
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```protobuf
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message User {
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// mid
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int64 mid = 1 [(gogoproto.moretags) = "form:\"mid\" validate:\"required,min=1\""];
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}
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```
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参考 https://github.com/gogo/protobuf/blob/master/extensions.md
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### TODO
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- [ ] 完善错误提示
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- [ ] 更加完善的 google.api.http 支持
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### Roadmap
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- [x] 修改已有的工具实现读取 google.api.http option 生成 bm server
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- [ ] 添加 bilibili.api.extra option,扩展 google.api.http
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### 已知问题
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* 复杂结构问题,由于 http from 表达能力有限,无法很好的描述有些复杂的 protobuf message,解决: 内嵌 protobuf 或者 使用 json?
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* 老项目兼容问题,有些项目会返回类似 map[string]interface{} 之类的结构,无法再 protobuf,解决: 内嵌 json ?
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### 参考文档
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* [google.api.http 定义](https://github.com/googleapis/googleapis/blob/master/google/api/http.proto)
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* [grpc-gateway](https://github.com/grpc-ecosystem/grpc-gateway)
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### client 代码生成
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#### iOS 代码生成
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TODO
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#### Android 代码生成
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TODO
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/cc @liugang @zhoujiahui
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