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250 lines
5.8 KiB
250 lines
5.8 KiB
package p2p
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import (
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"errors"
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"fmt"
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"net"
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"time"
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. "github.com/tendermint/tendermint/common"
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)
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type Reactor interface {
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Start(sw *Switch)
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Stop()
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GetChannels() []*ChannelDescriptor
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AddPeer(peer *Peer)
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RemovePeer(peer *Peer, reason interface{})
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Receive(chId byte, peer *Peer, msgBytes []byte)
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}
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//-----------------------------------------------------------------------------
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/*
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The `Switch` handles peer connections and exposes an API to receive incoming messages
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on `Reactors`. Each `Reactor` is responsible for handling incoming messages of one
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or more `Channels`. So while sending outgoing messages is typically performed on the peer,
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incoming messages are received on the reactor.
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*/
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type Switch struct {
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network string
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reactors map[string]Reactor
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chDescs []*ChannelDescriptor
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reactorsByCh map[byte]Reactor
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peers *PeerSet
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dialing *CMap
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listeners *CMap // listenerName -> chan interface{}
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}
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var (
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ErrSwitchDuplicatePeer = errors.New("Duplicate peer")
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)
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const (
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peerDialTimeoutSeconds = 3
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)
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func NewSwitch() *Switch {
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sw := &Switch{
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network: "",
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reactors: make(map[string]Reactor),
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chDescs: make([]*ChannelDescriptor, 0),
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reactorsByCh: make(map[byte]Reactor),
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peers: NewPeerSet(),
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dialing: NewCMap(),
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listeners: NewCMap(),
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}
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return sw
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}
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// Not goroutine safe.
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func (sw *Switch) SetNetwork(network string) {
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sw.network = network
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}
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// Not goroutine safe.
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func (sw *Switch) AddReactor(name string, reactor Reactor) Reactor {
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// Validate the reactor.
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// No two reactors can share the same channel.
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reactorChannels := reactor.GetChannels()
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for _, chDesc := range reactorChannels {
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chId := chDesc.Id
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if sw.reactorsByCh[chId] != nil {
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panic(fmt.Sprintf("Channel %X has multiple reactors %v & %v", chId, sw.reactorsByCh[chId], reactor))
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}
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sw.chDescs = append(sw.chDescs, chDesc)
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sw.reactorsByCh[chId] = reactor
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}
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sw.reactors[name] = reactor
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return reactor
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}
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func (sw *Switch) Reactor(name string) Reactor {
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return sw.reactors[name]
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}
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// Convenience function
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func (sw *Switch) StartReactors() {
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for _, reactor := range sw.reactors {
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reactor.Start(sw)
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}
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}
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// Convenience function
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func (sw *Switch) StopReactors() {
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// Stop all reactors.
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for _, reactor := range sw.reactors {
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reactor.Stop()
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}
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}
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// Convenience function
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func (sw *Switch) StopPeers() {
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// Stop each peer.
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for _, peer := range sw.peers.List() {
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peer.stop()
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}
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sw.peers = NewPeerSet()
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}
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// Convenience function
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func (sw *Switch) Stop() {
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sw.StopPeers()
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sw.StopReactors()
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}
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// Not goroutine safe to modify.
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func (sw *Switch) Reactors() map[string]Reactor {
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return sw.reactors
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}
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func (sw *Switch) AddPeerWithConnection(conn net.Conn, outbound bool) (*Peer, error) {
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peer := newPeer(conn, outbound, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError)
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// Add the peer to .peers
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if sw.peers.Add(peer) {
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log.Info("Added peer", "peer", peer)
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} else {
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log.Info("Ignoring duplicate peer", "peer", 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()
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// Notify listeners.
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sw.doAddPeer(peer)
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// Send handshake
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msg := &pexHandshakeMessage{Network: sw.network}
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peer.Send(PexChannel, msg)
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return peer, nil
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}
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func (sw *Switch) DialPeerWithAddress(addr *NetAddress) (*Peer, error) {
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log.Debug("Dialing address", "address", addr)
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sw.dialing.Set(addr.String(), addr)
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conn, err := addr.DialTimeout(peerDialTimeoutSeconds * time.Second)
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sw.dialing.Delete(addr.String())
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if err != nil {
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log.Debug("Failed dialing address", "address", addr, "error", err)
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return nil, err
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}
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peer, err := sw.AddPeerWithConnection(conn, true)
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if err != nil {
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log.Debug("Failed adding peer", "address", addr, "conn", conn, "error", err)
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return nil, err
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}
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log.Info("Dialed and added peer", "address", addr, "peer", peer)
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return peer, nil
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}
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func (sw *Switch) IsDialing(addr *NetAddress) bool {
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return sw.dialing.Has(addr.String())
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}
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// Broadcast runs a go routine for each attempted send, which will block
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// trying to send for defaultSendTimeoutSeconds. Returns a channel
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// which receives success values for each attempted send (false if times out)
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func (sw *Switch) Broadcast(chId byte, msg interface{}) chan bool {
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successChan := make(chan bool, len(sw.peers.List()))
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log.Debug("Broadcast", "channel", chId, "msg", msg)
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for _, peer := range sw.peers.List() {
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go func() {
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success := peer.Send(chId, msg)
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successChan <- success
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}()
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}
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return successChan
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}
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// Returns the count of outbound/inbound and outbound-dialing peers.
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func (sw *Switch) NumPeers() (outbound, inbound, dialing int) {
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peers := sw.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 = sw.dialing.Size()
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return
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}
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func (sw *Switch) Peers() IPeerSet {
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return sw.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 (sw *Switch) StopPeerForError(peer *Peer, reason interface{}) {
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log.Info("Stopping peer for error", "peer", peer, "error", reason)
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sw.peers.Remove(peer)
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peer.stop()
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// Notify listeners
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sw.doRemovePeer(peer, 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 (sw *Switch) StopPeerGracefully(peer *Peer) {
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log.Info("Stopping peer gracefully")
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sw.peers.Remove(peer)
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peer.stop()
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// Notify listeners
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sw.doRemovePeer(peer, nil)
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}
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func (sw *Switch) IsListening() bool {
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return sw.listeners.Size() > 0
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}
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func (sw *Switch) doAddPeer(peer *Peer) {
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for _, reactor := range sw.reactors {
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reactor.AddPeer(peer)
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}
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}
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func (sw *Switch) doRemovePeer(peer *Peer, reason interface{}) {
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for _, reactor := range sw.reactors {
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reactor.RemovePeer(peer, reason)
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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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