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239 lines
4.8 KiB
239 lines
4.8 KiB
package p2p
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import (
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"fmt"
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"io"
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"sync/atomic"
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"time"
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. "github.com/tendermint/tendermint/binary"
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)
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/* Peer */
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type Peer struct {
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outgoing bool
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conn *Connection
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channels map[string]*Channel
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quit chan struct{}
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started uint32
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stopped uint32
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}
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func newPeer(conn *Connection, channels map[string]*Channel) *Peer {
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return &Peer{
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conn: conn,
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channels: channels,
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quit: make(chan struct{}),
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stopped: 0,
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}
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}
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func (p *Peer) start(pktRecvQueues map[string]chan *InboundPacket, onPeerError func(*Peer, interface{})) {
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log.Debugf("Starting %v", p)
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if atomic.CompareAndSwapUint32(&p.started, 0, 1) {
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// on connection error
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onError := func(r interface{}) {
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p.stop()
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onPeerError(p, r)
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}
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p.conn.Start(p.channels, onError)
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for chName, _ := range p.channels {
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chInQueue := pktRecvQueues[chName]
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go p.recvHandler(chName, chInQueue)
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go p.sendHandler(chName)
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}
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}
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}
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func (p *Peer) stop() {
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if atomic.CompareAndSwapUint32(&p.stopped, 0, 1) {
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log.Debugf("Stopping %v", p)
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close(p.quit)
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p.conn.Stop()
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}
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}
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func (p *Peer) LocalAddress() *NetAddress {
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return p.conn.LocalAddress()
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}
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func (p *Peer) RemoteAddress() *NetAddress {
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return p.conn.RemoteAddress()
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}
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func (p *Peer) Channel(chName string) *Channel {
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return p.channels[chName]
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}
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// TryQueue returns true if the packet was successfully queued.
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// Returning true does not imply that the packet will be sent.
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func (p *Peer) TryQueue(pkt Packet) bool {
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channel := p.Channel(string(pkt.Channel))
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sendQueue := channel.sendQueue
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if atomic.LoadUint32(&p.stopped) == 1 {
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return false
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}
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sendQueue <- pkt
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return true
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select {
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case sendQueue <- pkt:
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return true
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default: // buffer full
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return false
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}
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}
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func (p *Peer) WriteTo(w io.Writer) (n int64, err error) {
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return p.RemoteAddress().WriteTo(w)
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}
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func (p *Peer) String() string {
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return fmt.Sprintf("Peer{%v-%v,o:%v}", p.LocalAddress(), p.RemoteAddress(), p.outgoing)
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}
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// sendHandler pulls from a channel and pushes to the connection.
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// Each channel gets its own sendHandler goroutine;
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// Golang's channel implementation handles the scheduling.
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func (p *Peer) sendHandler(chName string) {
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log.Tracef("%v sendHandler [%v]", p, chName)
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channel := p.channels[chName]
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sendQueue := channel.sendQueue
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FOR_LOOP:
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for {
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select {
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case <-p.quit:
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break FOR_LOOP
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case pkt := <-sendQueue:
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log.Tracef("Sending packet to peer sendQueue")
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// blocks until the connection is Stop'd,
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// which happens when this peer is Stop'd.
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p.conn.Send(pkt)
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}
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}
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log.Tracef("%v sendHandler [%v] closed", p, chName)
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// cleanup
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// (none)
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}
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// recvHandler pulls from a channel and pushes to the given pktRecvQueue.
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// Each channel gets its own recvHandler goroutine.
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// Many peers have goroutines that push to the same pktRecvQueue.
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// Golang's channel implementation handles the scheduling.
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func (p *Peer) recvHandler(chName string, pktRecvQueue chan<- *InboundPacket) {
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log.Tracef("%v recvHandler [%v]", p, chName)
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channel := p.channels[chName]
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recvQueue := channel.recvQueue
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FOR_LOOP:
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for {
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select {
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case <-p.quit:
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break FOR_LOOP
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case pkt := <-recvQueue:
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// send to pktRecvQueue
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inboundPacket := &InboundPacket{
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Peer: p,
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Time: Time{time.Now()},
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Packet: pkt,
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}
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select {
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case <-p.quit:
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break FOR_LOOP
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case pktRecvQueue <- inboundPacket:
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continue
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}
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}
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}
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log.Tracef("%v recvHandler [%v] closed", p, chName)
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// cleanup
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// (none)
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}
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/* ChannelDescriptor */
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type ChannelDescriptor struct {
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Name string
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SendBufferSize int
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RecvBufferSize int
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}
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/* Channel */
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type Channel struct {
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name string
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recvQueue chan Packet
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sendQueue chan Packet
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//stats Stats
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}
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func newChannel(desc ChannelDescriptor) *Channel {
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return &Channel{
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name: desc.Name,
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recvQueue: make(chan Packet, desc.RecvBufferSize),
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sendQueue: make(chan Packet, desc.SendBufferSize),
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}
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}
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func (c *Channel) Name() string {
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return c.name
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}
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func (c *Channel) RecvQueue() <-chan Packet {
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return c.recvQueue
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}
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func (c *Channel) SendQueue() chan<- Packet {
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return c.sendQueue
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}
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/* Packet */
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/*
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Packet encapsulates a ByteSlice on a Channel.
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*/
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type Packet struct {
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Channel String
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Bytes ByteSlice
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// Hash
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}
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func NewPacket(chName String, bytes ByteSlice) Packet {
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return Packet{
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Channel: chName,
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Bytes: bytes,
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}
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}
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func (p Packet) WriteTo(w io.Writer) (n int64, err error) {
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n, err = WriteOnto(p.Channel, w, n, err)
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n, err = WriteOnto(p.Bytes, w, n, err)
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return
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}
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func ReadPacketSafe(r io.Reader) (pkt Packet, err error) {
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chName, err := ReadStringSafe(r)
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if err != nil {
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return
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}
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// TODO: packet length sanity check.
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bytes, err := ReadByteSliceSafe(r)
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if err != nil {
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return
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}
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return NewPacket(chName, bytes), nil
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}
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/*
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InboundPacket extends Packet with fields relevant to incoming packets.
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*/
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type InboundPacket struct {
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Peer *Peer
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Time Time
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Packet
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}
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