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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package torrent | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "github.com/anacrolix/log" | ||
|
|
||
| pp "github.com/anacrolix/torrent/peer_protocol" | ||
| ) | ||
|
|
||
| const ( | ||
| pexRetryDelay = 10 * time.Second | ||
| pexInterval = 1 * time.Minute | ||
| ) | ||
|
|
||
| // per-connection PEX state | ||
| type pexConnState struct { | ||
| enabled bool | ||
| xid pp.ExtensionNumber | ||
| seq int | ||
| timer *time.Timer | ||
| gate chan struct{} | ||
| readyfn func() | ||
| torrent *Torrent | ||
| Listed bool | ||
| info log.Logger | ||
| dbg log.Logger | ||
| } | ||
|
|
||
| func (s *pexConnState) IsEnabled() bool { | ||
| return s.enabled | ||
| } | ||
|
|
||
| // Init is called from the reader goroutine upon the extended handshake completion | ||
| func (s *pexConnState) Init(c *PeerConn) { | ||
| xid, ok := c.PeerExtensionIDs[pp.ExtensionNamePex] | ||
| if !ok || xid == 0 || c.t.cl.config.DisablePEX { | ||
| return | ||
| } | ||
| s.xid = xid | ||
| s.seq = 0 | ||
| s.torrent = c.t | ||
| s.info = c.t.cl.logger | ||
| s.dbg = c.logger | ||
| s.readyfn = c.tickleWriter | ||
| s.gate = make(chan struct{}, 1) | ||
| s.timer = time.AfterFunc(0, func() { | ||
| s.gate <- struct{}{} | ||
| s.readyfn() // wake up the writer | ||
| }) | ||
| s.enabled = true | ||
| } | ||
|
|
||
| // schedule next PEX message | ||
| func (s *pexConnState) sched(delay time.Duration) { | ||
| s.timer.Reset(delay) | ||
| } | ||
|
|
||
| // generate next PEX message for the peer; returns nil if nothing yet to send | ||
| func (s *pexConnState) genmsg() *pp.PexMsg { | ||
| tx, seq := s.torrent.pex.Genmsg(s.seq) | ||
| if tx.Len() == 0 { | ||
| return nil | ||
| } | ||
| s.seq = seq | ||
| return tx | ||
| } | ||
|
|
||
| // Share is called from the writer goroutine if when it is woken up with the write buffers empty | ||
| func (s *pexConnState) Share(postfn messageWriter) { | ||
| select { | ||
| case <-s.gate: | ||
| if tx := s.genmsg(); tx != nil { | ||
| s.dbg.Print("sending PEX message: ", tx) | ||
| postfn(tx.Message(s.xid)) | ||
| s.sched(pexInterval) | ||
| } else { | ||
| // no PEX to send this time - try again shortly | ||
| s.sched(pexRetryDelay) | ||
| } | ||
| default: | ||
| return | ||
| } | ||
| } | ||
|
|
||
| // Recv is called from the reader goroutine | ||
| func (s *pexConnState) Recv(payload []byte) error { | ||
| rx, err := pp.LoadPexMsg(payload) | ||
| if err != nil { | ||
| return fmt.Errorf("error unmarshalling PEX message: %s", err) | ||
| } | ||
| s.dbg.Print("incoming PEX message: ", rx) | ||
| torrent.Add("pex added peers received", int64(len(rx.Added))) | ||
| torrent.Add("pex added6 peers received", int64(len(rx.Added6))) | ||
|
|
||
| var peers Peers | ||
| peers.AppendFromPex(rx.Added6, rx.Added6Flags) | ||
| peers.AppendFromPex(rx.Added, rx.AddedFlags) | ||
| s.dbg.Printf("adding %d peers from PEX", len(peers)) | ||
| s.torrent.addPeers(peers) | ||
| // s.dbg.Print("known swarm now:", s.torrent.KnownSwarm()) | ||
|
|
||
| // one day we may also want to: | ||
| // - check if the peer is not flooding us with PEX updates | ||
| // - handle drops somehow | ||
| // - detect malicious peers | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (s *pexConnState) Close() { | ||
| if s.timer != nil { | ||
| s.timer.Stop() | ||
| } | ||
| } |
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