Create & Init Project...

library/database/tidb/node_proc.go

@@ -0,0 +1,82 @@
+package tidb
+
+import (
+	"time"
+
+	"go-common/library/log"
+)
+
+func (db *DB) nodeproc(e <-chan struct{}) {
+	if db.dis == nil {
+		return
+	}
+	for {
+		<-e
+		nodes := db.nodeList()
+		if len(nodes) == 0 {
+			continue
+		}
+		cm := make(map[string]*conn)
+		var conns []*conn
+		for _, conn := range db.conns {
+			cm[conn.addr] = conn
+		}
+		for _, node := range nodes {
+			if cm[node] != nil {
+				conns = append(conns, cm[node])
+				continue
+			}
+			c, err := db.connectDSN(genDSN(db.conf.DSN, node))
+			if err == nil {
+				conns = append(conns, c)
+			} else {
+				log.Error("tidb: connect addr: %s err: %+v", node, err)
+			}
+		}
+		if len(conns) == 0 {
+			log.Error("tidb: no nodes ignore event")
+			continue
+		}
+		oldConns := db.conns
+		db.mutex.Lock()
+		db.conns = conns
+		db.mutex.Unlock()
+		log.Info("tidb: new nodes: %v", nodes)
+		var removedConn []*conn
+		for _, conn := range oldConns {
+			var exist bool
+			for _, c := range conns {
+				if c.addr == conn.addr {
+					exist = true
+					break
+				}
+			}
+			if !exist {
+				removedConn = append(removedConn, conn)
+			}
+		}
+		go db.closeConns(removedConn)
+	}
+}
+
+func (db *DB) closeConns(conns []*conn) {
+	if len(conns) == 0 {
+		return
+	}
+	du := db.conf.QueryTimeout
+	if db.conf.ExecTimeout > du {
+		du = db.conf.ExecTimeout
+	}
+	if db.conf.TranTimeout > du {
+		du = db.conf.TranTimeout
+	}
+	time.Sleep(time.Duration(du))
+	for _, conn := range conns {
+		err := conn.Close()
+		if err != nil {
+			log.Error("tidb: close removed conn: %s err: %v", conn.addr, err)
+		} else {
+			log.Info("tidb: close removed conn: %s", conn.addr)
+		}
+	}
+}