70 lines
1.5 KiB
Go
70 lines
1.5 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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"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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}
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func (srv *Server) ListenAndServe() error {
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listenAddr, err := net.ResolveUDPAddr("udp", srv.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 srv.config.UDPReadBufferSize > 0 {
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sock.SetReadBuffer(srv.config.UDPReadBufferSize)
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}
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pool := bufferpool.New(1000, 2048)
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for {
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buffer := pool.TakeSlice()
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n, addr, err := sock.ReadFromUDP(buffer)
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if err != nil {
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return err
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}
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go func() {
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response := srv.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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}
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func Serve(cfg *config.Config, tkr *tracker.Tracker) {
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srv := &Server{
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config: cfg,
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tracker: tkr,
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}
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glog.V(0).Info("Starting UDP on ", cfg.UDPListenAddr)
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if err := srv.ListenAndServe(); err != nil {
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glog.Errorf("Failed to run UDP server: %s", err.Error())
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}
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}
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