update log

simple-tcp-proxy.go

@@ -1,17 +1,17 @@
 package main
- 
+
 import (
+	"encoding/json"
 	"fmt"
 	"io"
 	"io/ioutil"
 	"net"
 	"os"
 	"strings"
-	"encoding/json"
 )
 
 type TcpListen struct {
-	Listen string `json:"listen"`
+	Listen  string `json:"listen"`
 	Backend string `json:"backend"`
 }
 
@@ -21,57 +21,58 @@ type TcpListenConfig struct {
 
 // {
 //   "tcpListens": [
+//     {
 //       "listen": ":8080",
 //       "backend": "11.22.33.44:8080"
+//     }
 //   ]
 // }
-// https://blog.csdn.net/fyxichen/article/details/51505542 
+// https://blog.csdn.net/fyxichen/article/details/51505542
 func main() {
-
 	tcpListenConfig, err := readConfigFile()
 
 	if err != nil {
-		fmt.Printf("Error in load config file: %v\n", err)
+		fmt.Printf("[ERROR] Error in load config file: %v\n", err)
 		return
 	}
 
 	if len(tcpListenConfig.TcpListens) == 0 {
-		fmt.Println("Not find any mapping in config")
+		fmt.Println("[ERROR] Not find any mapping in config")
 		return
 	}
 
 	for _, tcpListen := range tcpListenConfig.TcpListens {
-		go server(tcpListen)
+		go serverTcpListen(tcpListen)
 	}
 	ExitChan := make(chan bool, 1)
 	<-ExitChan
 }
 
-func server(tcpListen TcpListen) {
+func serverTcpListen(tcpListen TcpListen) {
 	lis, err := net.Listen("tcp", tcpListen.Listen)
 	if err != nil {
 		fmt.Println(err)
 		return
 	}
 	defer lis.Close()
-	fmt.Printf("Listen TCP at: %v  --> %v\n", tcpListen.Listen, tcpListen.Backend)
+	fmt.Printf("[INFO] Listen TCP at: %v  --> %v\n", tcpListen.Listen, tcpListen.Backend)
 	for {
 		conn, err := lis.Accept()
 		if err != nil {
-			fmt.Printf("Listen error: %v\n", err)
+			fmt.Printf("[ERROR] Listen error: %v\n", err)
 			continue
 		}
-		fmt.Printf("TCP connection from %v, local: %v\n", conn.RemoteAddr(), conn.LocalAddr())
-		go handle(tcpListen, conn)
+		fmt.Printf("[INFO] TCP connection from %v, local: %v\n", conn.RemoteAddr(), conn.LocalAddr())
+		go handleRequest(tcpListen, conn)
 	}
 }
 
-func handle(tcpListen TcpListen, sconn net.Conn) {
+func handleRequest(tcpListen TcpListen, sconn net.Conn) {
 	defer sconn.Close()
 	ip := tcpListen.Backend
 	dconn, err := net.Dial("tcp", ip)
 	if err != nil {
-		fmt.Printf("Connect to %v failed:%v\n", ip, err)
+		fmt.Printf("[ERROR] Connect to %v failed:%v\n", ip, err)
 		return
 	}
 	ExitChan := make(chan bool, 1)
@@ -80,9 +81,9 @@ func handle(tcpListen TcpListen, sconn net.Conn) {
 		if err != nil {
 			errStr := fmt.Sprintf("%v", err)
 			if strings.Contains(errStr, "use of closed network connection") {
-				fmt.Printf("Connection closed: %v\n", ip)
+				fmt.Printf("[INFO] Connection closed: %v\n", ip)
 			} else {
-				fmt.Printf("Send data to %v failed:%v\n", ip, err)
+				fmt.Printf("[WARN] Send data to %v failed:%v\n", ip, err)
 			}
 		}
 		ExitChan <- true
@@ -92,9 +93,9 @@ func handle(tcpListen TcpListen, sconn net.Conn) {
 		if err != nil {
 			errStr := fmt.Sprintf("%v", err)
 			if strings.Contains(errStr, "use of closed network connection") {
-				fmt.Printf("Connection closed: %v\n", ip)
+				fmt.Printf("[INFO] Connection closed: %v\n", ip)
 			} else {
-				fmt.Printf("Receive data from %v failed:%v\n", ip, err)
+				fmt.Printf("[WARN] Receive data from %v failed:%v\n", ip, err)
 			}
 		}
 		ExitChan <- true
@@ -114,11 +115,11 @@ func readConfigFile() (*TcpListenConfig, error) {
 	if err != nil {
 		return nil, err
 	}
-	var tcpListenConfig TcpListenConfig 
+	var tcpListenConfig TcpListenConfig
 	err = json.Unmarshal(configFileBytes, &tcpListenConfig)
 	if err != nil {
 		return nil, err
 	}
- 	
+
 	return &tcpListenConfig, nil
-}
+}