100 lines
1.7 KiB
Go
100 lines
1.7 KiB
Go
package gost
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import (
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"io"
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"net"
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"time"
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"github.com/go-log/log"
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)
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// Server is a proxy server.
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type Server struct {
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l net.Listener
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handler Handler
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}
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// Handle sets a handler for the server
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func (s *Server) Handle(h Handler) {
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s.handler = h
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}
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// Serve serves as a proxy server.
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func (s *Server) Serve(l net.Listener) error {
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defer l.Close()
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var tempDelay time.Duration
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for {
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conn, e := l.Accept()
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if e != nil {
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if ne, ok := e.(net.Error); ok && ne.Temporary() {
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if tempDelay == 0 {
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tempDelay = 5 * time.Millisecond
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} else {
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tempDelay *= 2
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}
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if max := 1 * time.Second; tempDelay > max {
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tempDelay = max
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}
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log.Logf("server: Accept error: %v; retrying in %v", e, tempDelay)
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time.Sleep(tempDelay)
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continue
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}
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return e
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}
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tempDelay = 0
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go s.handler.Handle(conn)
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}
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}
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// Listener is a proxy server listener, just like a net.Listener.
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type Listener interface {
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net.Listener
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}
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type tcpListener struct {
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net.Listener
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}
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func TCPListener(addr string) (Listener, error) {
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ln, err := net.Listen("tcp", addr)
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if err != nil {
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return nil, err
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}
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return &tcpListener{Listener: &tcpKeepAliveListener{ln.(*net.TCPListener)}}, nil
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}
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type tcpKeepAliveListener struct {
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*net.TCPListener
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}
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func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
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tc, err := ln.AcceptTCP()
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if err != nil {
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return
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}
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tc.SetKeepAlive(true)
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tc.SetKeepAlivePeriod(KeepAliveTime)
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return tc, nil
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}
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func transport(rw1, rw2 io.ReadWriter) error {
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errc := make(chan error, 1)
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go func() {
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_, err := io.Copy(rw1, rw2)
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errc <- err
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}()
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go func() {
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_, err := io.Copy(rw2, rw1)
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errc <- err
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}()
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err := <-errc
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if err != nil && err == io.EOF {
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err = nil
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}
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return err
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}
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