147 lines
3.7 KiB
Go
147 lines
3.7 KiB
Go
// Copyright 2016 Jimmy Zelinskie
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package http implements a BitTorrent tracker via the HTTP protocol as
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// described in BEP 3 and BEP 23.
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package http
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// Config represents all of the configurable options for an HTTP BitTorrent
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// Tracker.
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type Config struct {
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Addr string
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ReadTimeout time.Duration
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WriteTimeout time.Duration
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RequestTimeout time.Duration
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AllowIPSpoofing bool
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RealIPHeader string
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}
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// Tracker holds the state of an HTTP BitTorrent Tracker.
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type Tracker struct {
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grace *graceful.Server
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bittorrent.TrackerFuncs
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Config
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}
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// NewTracker allocates a new instance of a Tracker.
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func NewTracker(funcs bittorrent.TrackerFuncs, cfg Config) {
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return &Server{
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TrackerFuncs: funcs,
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Config: cfg,
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}
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}
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// Stop provides a thread-safe way to shutdown a currently running Tracker.
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func (t *Tracker) Stop() {
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t.grace.Stop(t.grace.Timeout)
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<-t.grace.StopChan()
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}
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func (t *Tracker) handler() {
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router := httprouter.New()
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router.GET("/announce", t.announceRoute)
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router.GET("/scrape", t.scrapeRoute)
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return server
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}
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// ListenAndServe listens on the TCP network address t.Addr and blocks serving
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// BitTorrent requests until t.Stop() is called or an error is returned.
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func (t *Tracker) ListenAndServe() error {
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t.grace = &graceful.Server{
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Server: &http.Server{
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Addr: t.Addr,
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Handler: t.handler(),
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ReadTimeout: t.ReadTimeout,
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WriteTimeout: t.WriteTimeout,
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},
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Timeout: t.RequestTimeout,
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NoSignalHandling: true,
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ConnState: func(conn net.Conn, state http.ConnState) {
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switch state {
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case http.StateNew:
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//stats.RecordEvent(stats.AcceptedConnection)
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case http.StateClosed:
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//stats.RecordEvent(stats.ClosedConnection)
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case http.StateHijacked:
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panic("http: connection impossibly hijacked")
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// Ignore the following cases.
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case http.StateActive, http.StateIdle:
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default:
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panic("http: connection transitioned to unknown state")
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}
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},
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}
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t.grace.SetKeepAlivesEnabled(false)
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if err := t.grace.ListenAndServe(); err != nil {
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if opErr, ok := err.(*net.OpError); !ok || (ok && opErr.Op != "accept") {
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panic("http: failed to gracefully run HTTP server: " + err.Error())
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}
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}
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}
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// announceRoute parses and responds to an Announce by using t.TrackerFuncs.
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func (t *Tracker) announceRoute(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
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req, err := ParseAnnounce(r, t.RealIPHeader, t.AllowIPSpoofing)
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if err != nil {
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WriteError(w, err)
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return
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}
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resp, err := t.HandleAnnounce(req)
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if err != nil {
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WriteError(w, err)
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return
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}
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err = WriteAnnounceResponse(w, resp)
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if err != nil {
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WriteError(w, err)
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return
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}
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if t.AfterAnnounce != nil {
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t.AfterAnnounce(req, resp)
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}
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}
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// scrapeRoute parses and responds to a Scrape by using t.TrackerFuncs.
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func (t *Tracker) scrapeRoute(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
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req, err := ParseScrape(r)
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if err != nil {
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WriteError(w, err)
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return
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}
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resp, err := t.HandleScrape(req)
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if err != nil {
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WriteError(w, err)
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return
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}
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err = WriteScrapeResponse(w, resp)
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if err != nil {
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WriteError(w, err)
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return
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}
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if t.AfterScrape != nil {
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t.AfterScrape(req, resp)
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}
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}
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