(1)分离出连接服务器的逻辑 (2)新增client断线重连功能

cmd/frpc/control.go

@@ -1,62 +1,54 @@
 package main
 
 import (
+	"encoding/json"
 	"io"
 	"sync"
-	"encoding/json"
+	"time"
 
 	"frp/pkg/models"
 	"frp/pkg/utils/conn"
 	"frp/pkg/utils/log"
 )
 
+// 重连时的间隔时间区间
+const (
+	sleepMinDuration = 1
+	sleepMaxDuration = 60
+)
+
 func ControlProcess(cli *models.ProxyClient, wait *sync.WaitGroup) {
 	defer wait.Done()
 
-	c := &conn.Conn{}
-	err := c.ConnectServer(ServerAddr, ServerPort)
-	if err != nil {
-		log.Error("ProxyName [%s], connect to server [%s:%d] error, %v", cli.Name, ServerAddr, ServerPort, err)
+	c := loginToServer(cli)
+	if c == nil {
+		log.Error("ProxyName [%s], connect to server failed!", cli.Name)
 		return
 	}
 	defer c.Close()
 
-	req := &models.ClientCtlReq{
-		Type:		models.ControlConn,
-		ProxyName:	cli.Name,
-		Passwd:		cli.Passwd,
-	}
-	buf, _ := json.Marshal(req)
-	err = c.Write(string(buf) + "\n")
-	if err != nil {
-		log.Error("ProxyName [%s], write to server error, %v", cli.Name, err)
-		return
-	}
-
-	res, err := c.ReadLine()
-	if err != nil {
-		log.Error("ProxyName [%s], read from server error, %v", cli.Name, err)
-		return
-	}
-	log.Debug("ProxyName [%s], read [%s]", cli.Name, res)
-
-	clientCtlRes := &models.ClientCtlRes{}
-	if err = json.Unmarshal([]byte(res), &clientCtlRes); err != nil {
-		log.Error("ProxyName [%s], format server response error, %v", cli.Name, err)
-		return
-	}
-
-	if clientCtlRes.Code != 0 {
-		log.Error("ProxyName [%s], start proxy error, %s", cli.Name, clientCtlRes.Msg)
-		return
-	}
-
 	for {
 		// ignore response content now
 		_, err := c.ReadLine()
 		if err == io.EOF {
+			// reconnect when disconnect
 			log.Debug("ProxyName [%s], server close this control conn", cli.Name)
-			break
+			var sleepTime time.Duration = 1
+			for {
+				log.Debug("ProxyName [%s], try to reconnect to server[%s:%d]...", cli.Name, ServerAddr, ServerPort)
+				tmpConn := loginToServer(cli)
+				if tmpConn != nil {
+					c.Close()
+					c = tmpConn
+					break
+				}
+
+				if sleepTime < 60 {
+					sleepTime++
+				}
+				time.Sleep(sleepTime * time.Second)
+			}
+			continue
 		} else if err != nil {
 			log.Warn("ProxyName [%s], read from server error, %v", cli.Name, err)
 			continue
@@ -65,3 +57,54 @@ func ControlProcess(cli *models.ProxyClient, wait *sync.WaitGroup) {
 		cli.StartTunnel(ServerAddr, ServerPort)
 	}
 }
+
+func loginToServer(cli *models.ProxyClient) (connection *conn.Conn) {
+	c := &conn.Conn{}
+
+	connection = nil
+	for i := 0; i < 1; i++ { // ZWF: 此处的for作为控制流使用
+		err := c.ConnectServer(ServerAddr, ServerPort)
+		if err != nil {
+			log.Error("ProxyName [%s], connect to server [%s:%d] error, %v", cli.Name, ServerAddr, ServerPort, err)
+			break
+		}
+
+		req := &models.ClientCtlReq{
+			Type:      models.ControlConn,
+			ProxyName: cli.Name,
+			Passwd:    cli.Passwd,
+		}
+		buf, _ := json.Marshal(req)
+		err = c.Write(string(buf) + "\n")
+		if err != nil {
+			log.Error("ProxyName [%s], write to server error, %v", cli.Name, err)
+			break
+		}
+
+		res, err := c.ReadLine()
+		if err != nil {
+			log.Error("ProxyName [%s], read from server error, %v", cli.Name, err)
+			break
+		}
+		log.Debug("ProxyName [%s], read [%s]", cli.Name, res)
+
+		clientCtlRes := &models.ClientCtlRes{}
+		if err = json.Unmarshal([]byte(res), &clientCtlRes); err != nil {
+			log.Error("ProxyName [%s], format server response error, %v", cli.Name, err)
+			break
+		}
+
+		if clientCtlRes.Code != 0 {
+			log.Error("ProxyName [%s], start proxy error, %s", cli.Name, clientCtlRes.Msg)
+			break
+		}
+
+		connection = c
+	}
+
+	if connection == nil {
+		c.Close()
+	}
+
+	return
+}