117 lines
2.2 KiB
Go
117 lines
2.2 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"log"
|
|
"net"
|
|
|
|
"github.com/gorilla/websocket"
|
|
)
|
|
|
|
func handleConnection(tcpConn net.Conn, wsURL string) {
|
|
defer tcpConn.Close()
|
|
|
|
conn, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
|
|
wsConn := NewWebSocketConn(conn)
|
|
if err != nil {
|
|
log.Println("WebSocket connection error:", err)
|
|
return
|
|
}
|
|
defer wsConn.Close()
|
|
|
|
waitChannel := make(chan bool)
|
|
|
|
go func() {
|
|
defer func() {
|
|
waitChannel <- true
|
|
}()
|
|
_, _ = io.Copy(tcpConn, wsConn)
|
|
// TODO print error
|
|
}()
|
|
|
|
go func() {
|
|
defer func() {
|
|
waitChannel <- true
|
|
}()
|
|
for {
|
|
buffer := make([]byte, 1024)
|
|
n, err := tcpConn.Read(buffer)
|
|
if err != nil {
|
|
if err != io.EOF {
|
|
log.Println("TCP read error:", err)
|
|
}
|
|
return
|
|
}
|
|
err = conn.WriteMessage(websocket.BinaryMessage, buffer[:n])
|
|
if err != nil {
|
|
log.Println("WebSocket write error:", err)
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
|
|
<-waitChannel
|
|
}
|
|
|
|
func main() {
|
|
tcpPort := "7000"
|
|
wsURL := "ws://localhost:8000/ws" // Replace with your WebSocket server URL
|
|
|
|
listener, err := net.Listen("tcp", ":"+tcpPort)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
defer listener.Close()
|
|
|
|
log.Printf("TCP server listening on port %s", tcpPort)
|
|
log.Printf("Forwarding connections to WebSocket server at %s", wsURL)
|
|
|
|
for {
|
|
conn, err := listener.Accept()
|
|
if err != nil {
|
|
log.Println(err)
|
|
continue
|
|
}
|
|
go handleConnection(conn, wsURL)
|
|
}
|
|
}
|
|
|
|
type WebSocketConn struct {
|
|
conn *websocket.Conn
|
|
buf []byte
|
|
}
|
|
|
|
func NewWebSocketConn(conn *websocket.Conn) *WebSocketConn {
|
|
return &WebSocketConn{conn: conn}
|
|
}
|
|
|
|
func (websocketConn *WebSocketConn) Read(p []byte) (n int, err error) {
|
|
if len(websocketConn.buf) == 0 {
|
|
_, message, err := websocketConn.conn.ReadMessage()
|
|
fmt.Println("Got message ", message)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
websocketConn.buf = message
|
|
}
|
|
|
|
n = copy(p, websocketConn.buf)
|
|
websocketConn.buf = websocketConn.buf[n:]
|
|
|
|
log.Println("Read ", n, " bytes")
|
|
return n, err
|
|
}
|
|
|
|
func (websocketConn *WebSocketConn) Write(p []byte) (n int, err error) {
|
|
err = websocketConn.conn.WriteMessage(websocket.BinaryMessage, p)
|
|
if err != nil {
|
|
n = len(p)
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
func (websocketConn *WebSocketConn) Close() error {
|
|
return websocketConn.conn.Close()
|
|
}
|