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347 lines
9.1 KiB
347 lines
9.1 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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"strconv"
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"sync/atomic"
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"time"
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. "github.com/tendermint/tendermint/common"
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"github.com/tendermint/tendermint/types"
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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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type BaseReactor struct{}
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func (_ BaseReactor) Start(sw *Switch) {}
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func (_ BaseReactor) Stop() {}
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func (_ BaseReactor) GetChannels() []*ChannelDescriptor { return nil }
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func (_ BaseReactor) AddPeer(peer *Peer) {}
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func (_ BaseReactor) RemovePeer(peer *Peer, reason interface{}) {}
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func (_ BaseReactor) Receive(chId byte, peer *Peer, msgBytes []byte) {}
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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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listeners []Listener
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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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running uint32
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nodeInfo *types.NodeInfo // our node info
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}
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var (
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ErrSwitchDuplicatePeer = errors.New("Duplicate peer")
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ErrSwitchMaxPeersPerIPRange = errors.New("IP range has too many peers")
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)
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const (
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peerDialTimeoutSeconds = 3 // TODO make this configurable
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maxNumPeers = 50 // TODO make this configurable
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)
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func NewSwitch() *Switch {
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sw := &Switch{
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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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running: 0,
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nodeInfo: nil,
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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) 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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// Not goroutine safe.
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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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// Not goroutine safe.
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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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// Not goroutine safe.
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func (sw *Switch) AddListener(l Listener) {
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sw.listeners = append(sw.listeners, l)
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}
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// Not goroutine safe.
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func (sw *Switch) Listeners() []Listener {
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return sw.listeners
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}
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// Not goroutine safe.
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func (sw *Switch) IsListening() bool {
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return len(sw.listeners) > 0
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}
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// Not goroutine safe.
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func (sw *Switch) SetNodeInfo(nodeInfo *types.NodeInfo) {
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sw.nodeInfo = nodeInfo
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}
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// Not goroutine safe.
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func (sw *Switch) NodeInfo() *types.NodeInfo {
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return sw.nodeInfo
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}
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func (sw *Switch) Start() {
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if atomic.CompareAndSwapUint32(&sw.running, 0, 1) {
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// Start reactors
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for _, reactor := range sw.reactors {
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reactor.Start(sw)
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}
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// Start peers
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for _, peer := range sw.peers.List() {
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sw.startInitPeer(peer)
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}
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// Start listeners
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for _, listener := range sw.listeners {
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go sw.listenerRoutine(listener)
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}
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}
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}
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func (sw *Switch) Stop() {
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if atomic.CompareAndSwapUint32(&sw.running, 1, 0) {
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// Stop listeners
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for _, listener := range sw.listeners {
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listener.Stop()
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}
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sw.listeners = nil
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// Stop peers
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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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// Stop 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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}
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// NOTE: This performs a blocking handshake before the peer is added.
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// CONTRACT: Iff error is returned, peer is nil, and conn is immediately closed.
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func (sw *Switch) AddPeerWithConnection(conn net.Conn, outbound bool) (*Peer, error) {
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// First, perform handshake
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peerNodeInfo, err := peerHandshake(conn, sw.nodeInfo)
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if err != nil {
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conn.Close()
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return nil, err
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}
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// check version, chain id
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if err := sw.nodeInfo.CompatibleWith(peerNodeInfo); err != nil {
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conn.Close()
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return nil, err
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}
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// avoid self
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if peerNodeInfo.UUID == sw.nodeInfo.UUID {
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conn.Close()
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return nil, fmt.Errorf("Ignoring connection from self")
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}
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// the peerNodeInfo is not verified,
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// so we overwrite the IP with that from the conn
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// and if we dialed out, the port too
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// everything else we just have to trust
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ip, port, _ := net.SplitHostPort(conn.RemoteAddr().String())
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peerNodeInfo.Host = ip
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if outbound {
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porti, _ := strconv.Atoi(port)
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peerNodeInfo.P2PPort = uint16(porti)
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}
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peer := newPeer(conn, peerNodeInfo, outbound, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError)
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// Add the peer to .peers
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// ignore if duplicate or if we already have too many for that IP range
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if err := sw.peers.Add(peer); err != nil {
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log.Info("Ignoring peer", "error", err, "peer", peer)
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peer.stop() // will also close conn
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return nil, err
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}
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if atomic.LoadUint32(&sw.running) == 1 {
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sw.startInitPeer(peer)
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}
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log.Info("Added peer", "peer", peer)
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return peer, nil
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}
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func (sw *Switch) startInitPeer(peer *Peer) {
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peer.start() // spawn send/recv routines
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sw.addPeerToReactors(peer) // run AddPeer on each reactor
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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.IP.String(), addr)
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conn, err := addr.DialTimeout(peerDialTimeoutSeconds * time.Second)
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sw.dialing.Delete(addr.IP.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.IP.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(peer *Peer) {
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success := peer.Send(chId, msg)
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successChan <- success
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}(peer)
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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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sw.removePeerFromReactors(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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sw.removePeerFromReactors(peer, nil)
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}
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func (sw *Switch) addPeerToReactors(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) removePeerFromReactors(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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func (sw *Switch) listenerRoutine(l Listener) {
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for {
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inConn, ok := <-l.Connections()
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if !ok {
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break
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}
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// ignore connection if we already have enough
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if maxNumPeers <= sw.peers.Size() {
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log.Debug("Ignoring inbound connection: already have enough peers", "conn", inConn, "numPeers", sw.peers.Size(), "max", maxNumPeers)
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continue
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}
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// Ignore connections from IP ranges for which we have too many
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if sw.peers.HasMaxForIPRange(inConn) {
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log.Debug("Ignoring inbound connection: already have enough peers for that IP range", "address", inConn.RemoteAddr().String())
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continue
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}
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// New inbound connection!
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_, err := sw.AddPeerWithConnection(inConn, false)
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if err != nil {
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log.Info("Ignoring inbound connection: error on AddPeerWithConnection", "conn", inConn, "error", err)
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continue
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}
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// NOTE: We don't yet have the listening port of the
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// remote (if they have a listener at all).
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// The peerHandshake will handle that
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}
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// cleanup
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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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