package p2p import ( "fmt" "net" "time" cmn "github.com/tendermint/tendermint/libs/common" "github.com/tendermint/tendermint/libs/log" tmconn "github.com/tendermint/tendermint/p2p/conn" ) const metricsTickerDuration = 10 * time.Second // Peer is an interface representing a peer connected on a reactor. type Peer interface { cmn.Service FlushStop() ID() ID // peer's cryptographic ID RemoteIP() net.IP // remote IP of the connection RemoteAddr() net.Addr // remote address of the connection IsOutbound() bool // did we dial the peer IsPersistent() bool // do we redial this peer when we disconnect CloseConn() error // close original connection NodeInfo() NodeInfo // peer's info Status() tmconn.ConnectionStatus SocketAddr() *NetAddress // actual address of the socket Send(byte, []byte) bool TrySend(byte, []byte) bool Set(string, interface{}) Get(string) interface{} } //---------------------------------------------------------- // peerConn contains the raw connection and its config. type peerConn struct { outbound bool persistent bool conn net.Conn // source connection socketAddr *NetAddress // cached RemoteIP() ip net.IP } func newPeerConn( outbound, persistent bool, conn net.Conn, socketAddr *NetAddress, ) peerConn { return peerConn{ outbound: outbound, persistent: persistent, conn: conn, socketAddr: socketAddr, } } // ID only exists for SecretConnection. // NOTE: Will panic if conn is not *SecretConnection. func (pc peerConn) ID() ID { return PubKeyToID(pc.conn.(*tmconn.SecretConnection).RemotePubKey()) } // Return the IP from the connection RemoteAddr func (pc peerConn) RemoteIP() net.IP { if pc.ip != nil { return pc.ip } host, _, err := net.SplitHostPort(pc.conn.RemoteAddr().String()) if err != nil { panic(err) } ips, err := net.LookupIP(host) if err != nil { panic(err) } pc.ip = ips[0] return pc.ip } // peer implements Peer. // // Before using a peer, you will need to perform a handshake on connection. type peer struct { cmn.BaseService // raw peerConn and the multiplex connection peerConn mconn *tmconn.MConnection // peer's node info and the channel it knows about // channels = nodeInfo.Channels // cached to avoid copying nodeInfo in hasChannel nodeInfo NodeInfo channels []byte // User data Data *cmn.CMap metrics *Metrics metricsTicker *time.Ticker } type PeerOption func(*peer) func newPeer( pc peerConn, mConfig tmconn.MConnConfig, nodeInfo NodeInfo, reactorsByCh map[byte]Reactor, chDescs []*tmconn.ChannelDescriptor, onPeerError func(Peer, interface{}), options ...PeerOption, ) *peer { p := &peer{ peerConn: pc, nodeInfo: nodeInfo, channels: nodeInfo.(DefaultNodeInfo).Channels, // TODO Data: cmn.NewCMap(), metricsTicker: time.NewTicker(metricsTickerDuration), metrics: NopMetrics(), } p.mconn = createMConnection( pc.conn, p, reactorsByCh, chDescs, onPeerError, mConfig, ) p.BaseService = *cmn.NewBaseService(nil, "Peer", p) for _, option := range options { option(p) } return p } // String representation. func (p *peer) String() string { if p.outbound { return fmt.Sprintf("Peer{%v %v out}", p.mconn, p.ID()) } return fmt.Sprintf("Peer{%v %v in}", p.mconn, p.ID()) } //--------------------------------------------------- // Implements cmn.Service // SetLogger implements BaseService. func (p *peer) SetLogger(l log.Logger) { p.Logger = l p.mconn.SetLogger(l) } // OnStart implements BaseService. func (p *peer) OnStart() error { if err := p.BaseService.OnStart(); err != nil { return err } if err := p.mconn.Start(); err != nil { return err } go p.metricsReporter() return nil } // FlushStop mimics OnStop but additionally ensures that all successful // .Send() calls will get flushed before closing the connection. // NOTE: it is not safe to call this method more than once. func (p *peer) FlushStop() { p.metricsTicker.Stop() p.BaseService.OnStop() p.mconn.FlushStop() // stop everything and close the conn } // OnStop implements BaseService. func (p *peer) OnStop() { p.metricsTicker.Stop() p.BaseService.OnStop() p.mconn.Stop() // stop everything and close the conn } //--------------------------------------------------- // Implements Peer // ID returns the peer's ID - the hex encoded hash of its pubkey. func (p *peer) ID() ID { return p.nodeInfo.ID() } // IsOutbound returns true if the connection is outbound, false otherwise. func (p *peer) IsOutbound() bool { return p.peerConn.outbound } // IsPersistent returns true if the peer is persitent, false otherwise. func (p *peer) IsPersistent() bool { return p.peerConn.persistent } // NodeInfo returns a copy of the peer's NodeInfo. func (p *peer) NodeInfo() NodeInfo { return p.nodeInfo } // SocketAddr returns the address of the socket. // For outbound peers, it's the address dialed (after DNS resolution). // For inbound peers, it's the address returned by the underlying connection // (not what's reported in the peer's NodeInfo). func (p *peer) SocketAddr() *NetAddress { return p.peerConn.socketAddr } // Status returns the peer's ConnectionStatus. func (p *peer) Status() tmconn.ConnectionStatus { return p.mconn.Status() } // Send msg bytes to the channel identified by chID byte. Returns false if the // send queue is full after timeout, specified by MConnection. func (p *peer) Send(chID byte, msgBytes []byte) bool { if !p.IsRunning() { // see Switch#Broadcast, where we fetch the list of peers and loop over // them - while we're looping, one peer may be removed and stopped. return false } else if !p.hasChannel(chID) { return false } res := p.mconn.Send(chID, msgBytes) if res { labels := []string{ "peer_id", string(p.ID()), "chID", fmt.Sprintf("%#x", chID), } p.metrics.PeerSendBytesTotal.With(labels...).Add(float64(len(msgBytes))) } return res } // TrySend msg bytes to the channel identified by chID byte. Immediately returns // false if the send queue is full. func (p *peer) TrySend(chID byte, msgBytes []byte) bool { if !p.IsRunning() { return false } else if !p.hasChannel(chID) { return false } res := p.mconn.TrySend(chID, msgBytes) if res { labels := []string{ "peer_id", string(p.ID()), "chID", fmt.Sprintf("%#x", chID), } p.metrics.PeerSendBytesTotal.With(labels...).Add(float64(len(msgBytes))) } return res } // Get the data for a given key. func (p *peer) Get(key string) interface{} { return p.Data.Get(key) } // Set sets the data for the given key. func (p *peer) Set(key string, data interface{}) { p.Data.Set(key, data) } // hasChannel returns true if the peer reported // knowing about the given chID. func (p *peer) hasChannel(chID byte) bool { for _, ch := range p.channels { if ch == chID { return true } } // NOTE: probably will want to remove this // but could be helpful while the feature is new p.Logger.Debug( "Unknown channel for peer", "channel", chID, "channels", p.channels, ) return false } // CloseConn closes original connection. Used for cleaning up in cases where the peer had not been started at all. func (p *peer) CloseConn() error { return p.peerConn.conn.Close() } //--------------------------------------------------- // methods only used for testing // TODO: can we remove these? // CloseConn closes the underlying connection func (pc *peerConn) CloseConn() { pc.conn.Close() // nolint: errcheck } // RemoteAddr returns peer's remote network address. func (p *peer) RemoteAddr() net.Addr { return p.peerConn.conn.RemoteAddr() } // CanSend returns true if the send queue is not full, false otherwise. func (p *peer) CanSend(chID byte) bool { if !p.IsRunning() { return false } return p.mconn.CanSend(chID) } //--------------------------------------------------- func PeerMetrics(metrics *Metrics) PeerOption { return func(p *peer) { p.metrics = metrics } } func (p *peer) metricsReporter() { for { select { case <-p.metricsTicker.C: status := p.mconn.Status() var sendQueueSize float64 for _, chStatus := range status.Channels { sendQueueSize += float64(chStatus.SendQueueSize) } p.metrics.PeerPendingSendBytes.With("peer_id", string(p.ID())).Set(sendQueueSize) case <-p.Quit(): return } } } //------------------------------------------------------------------ // helper funcs func createMConnection( conn net.Conn, p *peer, reactorsByCh map[byte]Reactor, chDescs []*tmconn.ChannelDescriptor, onPeerError func(Peer, interface{}), config tmconn.MConnConfig, ) *tmconn.MConnection { onReceive := func(chID byte, msgBytes []byte) { reactor := reactorsByCh[chID] if reactor == nil { // Note that its ok to panic here as it's caught in the conn._recover, // which does onPeerError. panic(fmt.Sprintf("Unknown channel %X", chID)) } labels := []string{ "peer_id", string(p.ID()), "chID", fmt.Sprintf("%#x", chID), } p.metrics.PeerReceiveBytesTotal.With(labels...).Add(float64(len(msgBytes))) reactor.Receive(chID, p, msgBytes) } onError := func(r interface{}) { onPeerError(p, r) } return tmconn.NewMConnectionWithConfig( conn, chDescs, onReceive, onError, config, ) }