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peer.go
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peer.go
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package peer
import (
"math"
"time"
"github.com/cenkalti/rain/internal/bitfield"
"github.com/cenkalti/rain/internal/mse"
"github.com/cenkalti/rain/internal/peerconn"
"github.com/cenkalti/rain/internal/peerconn/peerreader"
"github.com/cenkalti/rain/internal/peerconn/peerwriter"
"github.com/cenkalti/rain/internal/peerprotocol"
"github.com/cenkalti/rain/internal/pieceset"
"github.com/rcrowley/go-metrics"
)
type Peer struct {
*peerconn.Conn
ConnectedAt time.Time
Source Source
Bitfield *bitfield.Bitfield
AllowedFast pieceset.PieceSet
ID [20]byte
ExtensionsEnabled bool
FastEnabled bool
EncryptionCipher mse.CryptoMethod
ClientInterested bool
ClientChoking bool
PeerInterested bool
PeerChoking bool
OptimisticUnchoked bool
// Snubbed means peer is sending pieces too slow.
Snubbed bool
Downloading bool
downloadSpeed metrics.EWMA
uploadSpeed metrics.EWMA
// Messages received while we don't have info yet are saved here.
Messages []interface{}
ExtensionHandshake *peerprotocol.ExtensionHandshakeMessage
PEX *pex
snubTimeout time.Duration
snubTimer *time.Timer
closeC chan struct{}
doneC chan struct{}
}
type Message struct {
*Peer
Message interface{}
}
type PieceMessage struct {
*Peer
Piece peerreader.Piece
}
func New(p *peerconn.Conn, source Source, id [20]byte, extensions [8]byte, cipher mse.CryptoMethod, snubTimeout time.Duration) *Peer {
bf, _ := bitfield.NewBytes(extensions[:], 64)
fastEnabled := bf.Test(61)
extensionsEnabled := bf.Test(43)
t := time.NewTimer(math.MaxInt64)
t.Stop()
return &Peer{
Conn: p,
Source: source,
ConnectedAt: time.Now(),
ID: id,
ClientChoking: true,
PeerChoking: true,
ExtensionsEnabled: extensionsEnabled,
FastEnabled: fastEnabled,
EncryptionCipher: cipher,
snubTimeout: snubTimeout,
snubTimer: t,
closeC: make(chan struct{}),
doneC: make(chan struct{}),
downloadSpeed: metrics.NewEWMA1(),
uploadSpeed: metrics.NewEWMA1(),
}
}
func (p *Peer) Close() {
p.snubTimer.Stop()
if p.PEX != nil {
p.PEX.close()
}
close(p.closeC)
p.Conn.Close()
<-p.doneC
}
func (p *Peer) Run(messages chan Message, pieces chan PieceMessage, snubbed, disconnect chan *Peer) {
defer close(p.doneC)
go p.Conn.Run()
speedTicker := time.NewTicker(5 * time.Second)
defer speedTicker.Stop()
for {
select {
case pm, ok := <-p.Conn.Messages():
if !ok {
select {
case disconnect <- p:
case <-p.closeC:
}
return
}
if m, ok := pm.(peerreader.Piece); ok {
p.downloadSpeed.Update(int64(len(m.Data)))
select {
case pieces <- PieceMessage{Peer: p, Piece: m}:
case <-p.closeC:
return
}
} else {
if m, ok := pm.(peerwriter.BlockUploaded); ok {
p.uploadSpeed.Update(int64(m.Length))
}
select {
case messages <- Message{Peer: p, Message: pm}:
case <-p.closeC:
return
}
}
case <-p.snubTimer.C:
select {
case snubbed <- p:
case <-p.closeC:
return
}
case <-speedTicker.C:
p.downloadSpeed.Tick()
p.uploadSpeed.Tick()
case <-p.closeC:
return
}
}
}
func (p *Peer) StartPEX(initialPeers map[*Peer]struct{}) {
if p.PEX == nil {
p.PEX = newPEX(p.Conn, p.ExtensionHandshake.M[peerprotocol.ExtensionKeyPEX], initialPeers)
go p.PEX.run()
}
}
func (p *Peer) ResetSnubTimer() {
p.snubTimer.Reset(p.snubTimeout)
}
func (p *Peer) StopSnubTimer() {
p.snubTimer.Stop()
}
func (p *Peer) DownloadSpeed() uint {
return uint(p.downloadSpeed.Rate())
}
func (p *Peer) UploadSpeed() uint {
return uint(p.uploadSpeed.Rate())
}