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242 lines
5.3 KiB
242 lines
5.3 KiB
package p2p
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import (
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"errors"
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"sync/atomic"
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"time"
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. "github.com/tendermint/tendermint/common"
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)
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/*
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All communication amongst peers are multiplexed by "channels".
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(Not the same as Go "channels")
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To send a message, encapsulate it into a "Packet" and send it to each peer.
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You can find all connected and active peers by iterating over ".Peers().List()".
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".Broadcast()" is provided for convenience, but by iterating over
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the peers manually the caller can decide which subset receives a message.
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Inbound messages are received by calling ".Receive()".
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*/
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type Switch struct {
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channels []ChannelDescriptor
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pktRecvQueues map[string]chan *InboundPacket
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peers *PeerSet
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dialing *CMap
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listeners *CMap // name -> chan interface{}
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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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var (
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ErrSwitchStopped = errors.New("Switch already stopped")
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ErrSwitchDuplicatePeer = errors.New("Duplicate peer")
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)
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const (
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peerDialTimeoutSeconds = 30
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)
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func NewSwitch(channels []ChannelDescriptor) *Switch {
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// make pktRecvQueues...
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pktRecvQueues := make(map[string]chan *InboundPacket)
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for _, chDesc := range channels {
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// XXX: buffer this
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pktRecvQueues[chDesc.Name] = make(chan *InboundPacket)
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}
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s := &Switch{
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channels: channels,
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pktRecvQueues: pktRecvQueues,
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peers: NewPeerSet(),
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dialing: NewCMap(),
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listeners: NewCMap(),
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quit: make(chan struct{}),
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stopped: 0,
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}
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return s
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}
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func (s *Switch) Start() {
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if atomic.CompareAndSwapUint32(&s.started, 0, 1) {
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log.Info("Starting switch")
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}
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}
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func (s *Switch) Stop() {
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if atomic.CompareAndSwapUint32(&s.stopped, 0, 1) {
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log.Info("Stopping switch")
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close(s.quit)
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// stop each peer.
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for _, peer := range s.peers.List() {
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peer.stop()
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}
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// empty tree.
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s.peers = NewPeerSet()
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}
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}
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func (s *Switch) AddPeerWithConnection(conn *Connection, outbound bool) (*Peer, error) {
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if atomic.LoadUint32(&s.stopped) == 1 {
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return nil, ErrSwitchStopped
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}
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// Create channels for peer
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channels := map[string]*Channel{}
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for _, chDesc := range s.channels {
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channels[chDesc.Name] = newChannel(chDesc)
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}
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peer := newPeer(conn, channels)
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peer.outbound = outbound
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// Add the peer to .peers
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if s.peers.Add(peer) {
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log.Info("+ %v", peer)
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} else {
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log.Info("Ignoring duplicate: %v", peer)
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return nil, ErrSwitchDuplicatePeer
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}
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// Start the peer
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go peer.start(s.pktRecvQueues, s.StopPeerForError)
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// Notify listeners.
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s.emit(SwitchEventNewPeer{Peer: peer})
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return peer, nil
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}
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func (s *Switch) DialPeerWithAddress(addr *NetAddress) (*Peer, error) {
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if atomic.LoadUint32(&s.stopped) == 1 {
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return nil, ErrSwitchStopped
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}
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log.Info("Dialing peer @ %v", addr)
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s.dialing.Set(addr.String(), addr)
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conn, err := addr.DialTimeout(peerDialTimeoutSeconds * time.Second)
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s.dialing.Delete(addr.String())
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if err != nil {
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return nil, err
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}
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peer, err := s.AddPeerWithConnection(conn, true)
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if err != nil {
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return nil, err
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}
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return peer, nil
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}
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func (s *Switch) IsDialing(addr *NetAddress) bool {
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return s.dialing.Has(addr.String())
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}
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func (s *Switch) Broadcast(pkt Packet) (numSuccess, numFailure int) {
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if atomic.LoadUint32(&s.stopped) == 1 {
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return
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}
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log.Debug("Broadcast on [%v] len: %v", pkt.Channel, len(pkt.Bytes))
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for _, peer := range s.peers.List() {
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success := peer.TrySend(pkt)
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log.Debug("Broadcast for peer %v success: %v", peer, success)
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if success {
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numSuccess += 1
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} else {
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numFailure += 1
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}
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}
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return
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}
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// The events are of type SwitchEvent* defined below.
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// Switch does not close these listeners.
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func (s *Switch) AddEventListener(name string, listener chan<- interface{}) {
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s.listeners.Set(name, listener)
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}
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func (s *Switch) RemoveEventListener(name string) {
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s.listeners.Delete(name)
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}
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/*
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Receive blocks on a channel until a message is found.
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*/
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func (s *Switch) Receive(chName string) *InboundPacket {
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if atomic.LoadUint32(&s.stopped) == 1 {
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return nil
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}
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q := s.pktRecvQueues[chName]
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if q == nil {
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Panicf("Expected pktRecvQueues[%f], found none", chName)
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}
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select {
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case <-s.quit:
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return nil
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case inPacket := <-q:
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log.Debug("RECV %v", inPacket)
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return inPacket
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}
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}
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// Returns the count of outbound/inbound and outbound-dialing peers.
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func (s *Switch) NumPeers() (outbound, inbound, dialing int) {
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peers := s.peers.List()
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for _, peer := range peers {
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if peer.outbound {
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outbound++
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} else {
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inbound++
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}
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}
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dialing = s.dialing.Size()
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return
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}
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func (s *Switch) Peers() IPeerSet {
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return s.peers
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}
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// Disconnect from a peer due to external error.
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// TODO: make record depending on reason.
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func (s *Switch) StopPeerForError(peer *Peer, reason interface{}) {
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log.Info("- %v !! reason: %v", peer, reason)
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s.peers.Remove(peer)
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peer.stop()
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// Notify listeners
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s.emit(SwitchEventDonePeer{Peer: peer, Error: reason})
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}
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// Disconnect from a peer gracefully.
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// TODO: handle graceful disconnects.
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func (s *Switch) StopPeerGracefully(peer *Peer) {
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log.Info("- %v", peer)
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s.peers.Remove(peer)
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peer.stop()
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// Notify listeners
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s.emit(SwitchEventDonePeer{Peer: peer})
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}
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func (s *Switch) emit(event interface{}) {
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for _, ch_i := range s.listeners.Values() {
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ch := ch_i.(chan<- interface{})
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ch <- event
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}
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}
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//-----------------------------------------------------------------------------
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type SwitchEventNewPeer struct {
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Peer *Peer
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}
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type SwitchEventDonePeer struct {
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Peer *Peer
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Error interface{}
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}
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