129 lines
2.3 KiB
Go
129 lines
2.3 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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// Accepter represents a network endpoint that can accept connection from peer.
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type Accepter interface {
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Accept() (net.Conn, error)
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}
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// Server is a proxy server.
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type Server struct {
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Listener Listener
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Handler Handler
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options *ServerOptions
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}
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// Init intializes server with given options.
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func (s *Server) Init(opts ...ServerOption) {
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if s.options == nil {
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s.options = &ServerOptions{}
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}
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for _, opt := range opts {
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opt(s.options)
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}
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}
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// Addr returns the address of the server
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func (s *Server) Addr() net.Addr {
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return s.Listener.Addr()
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}
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// Close closes the server
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func (s *Server) Close() error {
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return s.Listener.Close()
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}
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// Serve serves as a proxy server.
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func (s *Server) Serve(h Handler, opts ...ServerOption) error {
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s.Init(opts...)
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if s.Listener == nil {
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ln, err := TCPListener("")
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if err != nil {
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return err
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}
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s.Listener = ln
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}
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if h == nil {
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h = s.Handler
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}
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if h == nil {
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h = HTTPHandler()
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}
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l := s.Listener
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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 h.Handle(conn)
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}
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}
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// Run starts to serve.
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func (s *Server) Run() error {
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return s.Serve(s.Handler)
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}
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// ServerOptions holds the options for Server.
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type ServerOptions struct {
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}
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// ServerOption allows a common way to set server options.
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type ServerOption func(opts *ServerOptions)
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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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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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errc <- copyBuffer(rw1, rw2)
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}()
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go func() {
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errc <- copyBuffer(rw2, rw1)
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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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func copyBuffer(dst io.Writer, src io.Reader) error {
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buf := lPool.Get().([]byte)
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defer lPool.Put(buf)
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_, err := io.CopyBuffer(dst, src, buf)
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return err
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}
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