First available commit

pkg/utils/conn/conn.go

@@ -0,0 +1,115 @@
+package conn
+
+import (
+	"fmt"
+	"net"
+	"bufio"
+	"sync"
+	"io"
+
+	"frp/pkg/utils/log"
+)
+
+type Listener struct {
+	Addr	net.Addr
+	Conns	chan *Conn
+}
+
+// wait util get one
+func (l *Listener) GetConn() (conn *Conn) {
+	conn = <-l.Conns
+	return conn
+}
+
+type Conn struct {
+	TcpConn		*net.TCPConn
+	Reader		*bufio.Reader
+}
+
+func (c *Conn) ConnectServer(host string, port int64) (err error) {
+	servertAddr, err := net.ResolveTCPAddr("tcp4", fmt.Sprintf("%s:%d", host, port))
+	if err != nil {
+		return err
+	}
+	conn, err := net.DialTCP("tcp", nil, servertAddr)
+	if err != nil {
+		return err
+	}
+	c.TcpConn = conn
+	c.Reader = bufio.NewReader(c.TcpConn)
+	return nil
+}
+
+func (c *Conn) GetRemoteAddr() (addr string) {
+	return c.TcpConn.RemoteAddr().String()
+}
+
+func (c *Conn) GetLocalAddr() (addr string) {
+	return c.TcpConn.LocalAddr().String()
+}
+
+func (c *Conn) ReadLine() (buff string, err error) {
+	buff, err = c.Reader.ReadString('\n')
+	return buff, err
+}
+
+func (c *Conn) Write(content string) (err error) {
+	_, err = c.TcpConn.Write([]byte(content))
+	return err
+}
+
+func (c *Conn) Close() {
+	c.TcpConn.Close()
+}
+
+func Listen(bindAddr string, bindPort int64) (l *Listener, err error) {
+	tcpAddr, err := net.ResolveTCPAddr("tcp4", fmt.Sprintf("%s:%d", bindAddr, bindPort))
+	listener, err := net.ListenTCP("tcp", tcpAddr)
+	if err != nil {
+		return l, err
+	}
+
+	l = &Listener{
+		Addr:	listener.Addr(),
+		Conns:	make(chan *Conn),
+	}
+
+	go func() {
+		for {
+			conn, err := listener.AcceptTCP()
+			if err != nil {
+				log.Error("Accept new tcp connection error, %v", err)
+				continue
+			}
+
+			c := &Conn{
+				TcpConn:	conn,
+			}
+			c.Reader = bufio.NewReader(c.TcpConn)
+			l.Conns <- c
+		}
+	}()
+	return l, err
+}
+
+// will block until conn close
+func Join(c1 *Conn, c2 *Conn) {
+	var wait sync.WaitGroup
+	pipe := func(to *Conn, from *Conn) {
+		defer to.Close()
+		defer from.Close()
+		defer wait.Done()
+
+		var err error
+		_, err = io.Copy(to.TcpConn, from.TcpConn)
+		if err != nil {
+			log.Warn("join conns error, %v", err)
+		}
+	}
+
+	wait.Add(2)
+	go pipe(c1, c2)
+	go pipe(c2, c1)
+	wait.Wait()
+	return
+}