91 lines
1.9 KiB
Go
91 lines
1.9 KiB
Go
// Copyright 2015 The Chihaya Authors. All rights reserved.
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// Use of this source code is governed by the BSD 2-Clause license,
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// which can be found in the LICENSE file.
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// Package udp implements a UDP BitTorrent tracker per BEP 15 and BEP 41.
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// IPv6 is currently unsupported as there is no widely-implemented standard.
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package udp
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import (
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"net"
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"time"
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"github.com/golang/glog"
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"github.com/pushrax/bufferpool"
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"github.com/chihaya/chihaya/config"
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"github.com/chihaya/chihaya/tracker"
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)
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// Server represents a UDP torrent tracker.
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type Server struct {
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config *config.Config
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tracker *tracker.Tracker
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done bool
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}
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func (s *Server) serve() error {
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listenAddr, err := net.ResolveUDPAddr("udp", s.config.UDPListenAddr)
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if err != nil {
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return err
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}
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sock, err := net.ListenUDP("udp", listenAddr)
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defer sock.Close()
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if err != nil {
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return err
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}
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if s.config.UDPReadBufferSize > 0 {
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sock.SetReadBuffer(s.config.UDPReadBufferSize)
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}
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pool := bufferpool.New(1000, 2048)
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for !s.done {
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buffer := pool.TakeSlice()
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sock.SetReadDeadline(time.Now().Add(time.Second))
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n, addr, err := sock.ReadFromUDP(buffer)
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if err != nil {
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if netErr, ok := err.(net.Error); ok && netErr.Temporary() {
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continue
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}
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return err
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}
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go func() {
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response := s.handlePacket(buffer[:n], addr)
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if response != nil {
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sock.WriteToUDP(response, addr)
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}
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pool.GiveSlice(buffer)
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}()
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}
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return nil
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}
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func (s *Server) Serve() {
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glog.V(0).Info("Starting UDP on ", s.config.UDPListenAddr)
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if err := s.serve(); err != nil {
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glog.Errorf("Failed to run UDP server: %s", err.Error())
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} else {
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glog.Info("UDP server shut down cleanly")
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}
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}
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// Stop cleanly shuts down the server.
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func (s *Server) Stop() {
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s.done = true
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}
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// NewServer returns a new UDP server for a given configuration and tracker.
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func NewServer(cfg *config.Config, tkr *tracker.Tracker) *Server {
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return &Server{
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config: cfg,
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tracker: tkr,
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}
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}
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