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370 lines
8.7 KiB
370 lines
8.7 KiB
package p2p
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import (
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"fmt"
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"io"
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"net"
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"runtime/debug"
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"time"
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"github.com/tendermint/tendermint/libs/cmap"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/libs/service"
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tmconn "github.com/tendermint/tendermint/p2p/conn"
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)
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//go:generate mockery --case underscore --name Peer
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const metricsTickerDuration = 10 * time.Second
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// Peer is an interface representing a peer connected on a reactor.
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type Peer interface {
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service.Service
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FlushStop()
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ID() NodeID // peer's cryptographic ID
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RemoteIP() net.IP // remote IP of the connection
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RemoteAddr() net.Addr // remote address of the connection
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IsOutbound() bool // did we dial the peer
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IsPersistent() bool // do we redial this peer when we disconnect
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CloseConn() error // close original connection
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NodeInfo() NodeInfo // peer's info
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Status() tmconn.ConnectionStatus
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SocketAddr() *NetAddress // actual address of the socket
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Send(byte, []byte) bool
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TrySend(byte, []byte) bool
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Set(string, interface{})
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Get(string) interface{}
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}
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//----------------------------------------------------------
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// peerConn contains the raw connection and its config.
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type peerConn struct {
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outbound bool
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persistent bool
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conn Connection
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ip net.IP // cached RemoteIP()
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}
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func newPeerConn(outbound, persistent bool, conn Connection) peerConn {
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return peerConn{
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outbound: outbound,
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persistent: persistent,
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conn: conn,
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}
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}
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// Return the IP from the connection RemoteAddr
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func (pc peerConn) RemoteIP() net.IP {
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if pc.ip == nil {
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pc.ip = pc.conn.RemoteEndpoint().IP
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}
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return pc.ip
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}
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// peer implements Peer.
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//
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// Before using a peer, you will need to perform a handshake on connection.
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type peer struct {
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service.BaseService
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// raw peerConn and the multiplex connection
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peerConn
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// peer's node info and the channel it knows about
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// channels = nodeInfo.Channels
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// cached to avoid copying nodeInfo in hasChannel
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nodeInfo NodeInfo
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channels []byte
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reactors map[byte]Reactor
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onPeerError func(Peer, interface{})
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// User data
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Data *cmap.CMap
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metrics *Metrics
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metricsTicker *time.Ticker
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}
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type PeerOption func(*peer)
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func newPeer(
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nodeInfo NodeInfo,
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pc peerConn,
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reactorsByCh map[byte]Reactor,
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onPeerError func(Peer, interface{}),
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options ...PeerOption,
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) *peer {
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p := &peer{
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peerConn: pc,
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nodeInfo: nodeInfo,
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channels: nodeInfo.Channels, // TODO
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reactors: reactorsByCh,
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onPeerError: onPeerError,
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Data: cmap.NewCMap(),
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metricsTicker: time.NewTicker(metricsTickerDuration),
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metrics: NopMetrics(),
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}
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p.BaseService = *service.NewBaseService(nil, "Peer", p)
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for _, option := range options {
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option(p)
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}
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return p
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}
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// onError calls the peer error callback.
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func (p *peer) onError(err interface{}) {
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p.onPeerError(p, err)
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}
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// String representation.
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func (p *peer) String() string {
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if p.outbound {
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return fmt.Sprintf("Peer{%v %v out}", p.conn, p.ID())
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}
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return fmt.Sprintf("Peer{%v %v in}", p.conn, p.ID())
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}
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//---------------------------------------------------
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// Implements service.Service
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// SetLogger implements BaseService.
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func (p *peer) SetLogger(l log.Logger) {
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p.Logger = l
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}
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// OnStart implements BaseService.
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func (p *peer) OnStart() error {
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if err := p.BaseService.OnStart(); err != nil {
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return err
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}
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go p.processMessages()
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go p.metricsReporter()
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return nil
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}
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// processMessages processes messages received from the connection.
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func (p *peer) processMessages() {
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defer func() {
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if r := recover(); r != nil {
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p.Logger.Error("peer message processing panic", "err", r, "stack", string(debug.Stack()))
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p.onError(fmt.Errorf("panic during peer message processing: %v", r))
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}
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}()
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for {
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chID, msg, err := p.conn.ReceiveMessage()
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if err != nil {
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p.onError(err)
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return
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}
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reactor, ok := p.reactors[byte(chID)]
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if !ok {
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p.onError(fmt.Errorf("unknown channel %v", chID))
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return
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}
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reactor.Receive(byte(chID), p, msg)
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}
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}
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// FlushStop mimics OnStop but additionally ensures that all successful
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// .Send() calls will get flushed before closing the connection.
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// NOTE: it is not safe to call this method more than once.
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func (p *peer) FlushStop() {
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p.metricsTicker.Stop()
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p.BaseService.OnStop()
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if err := p.conn.FlushClose(); err != nil {
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p.Logger.Debug("error while stopping peer", "err", err)
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}
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}
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// OnStop implements BaseService.
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func (p *peer) OnStop() {
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p.metricsTicker.Stop()
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p.BaseService.OnStop()
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if err := p.conn.Close(); err != nil {
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p.Logger.Debug("error while stopping peer", "err", err)
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}
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}
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//---------------------------------------------------
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// Implements Peer
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// ID returns the peer's ID - the hex encoded hash of its pubkey.
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func (p *peer) ID() NodeID {
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return p.nodeInfo.ID()
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}
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// IsOutbound returns true if the connection is outbound, false otherwise.
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func (p *peer) IsOutbound() bool {
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return p.peerConn.outbound
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}
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// IsPersistent returns true if the peer is persitent, false otherwise.
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func (p *peer) IsPersistent() bool {
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return p.peerConn.persistent
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}
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// NodeInfo returns a copy of the peer's NodeInfo.
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func (p *peer) NodeInfo() NodeInfo {
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return p.nodeInfo
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}
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// SocketAddr returns the address of the socket.
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// For outbound peers, it's the address dialed (after DNS resolution).
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// For inbound peers, it's the address returned by the underlying connection
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// (not what's reported in the peer's NodeInfo).
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func (p *peer) SocketAddr() *NetAddress {
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endpoint := p.peerConn.conn.RemoteEndpoint()
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return &NetAddress{
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ID: p.ID(),
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IP: endpoint.IP,
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Port: endpoint.Port,
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}
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}
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// Status returns the peer's ConnectionStatus.
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func (p *peer) Status() tmconn.ConnectionStatus {
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return p.conn.Status()
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}
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// Send msg bytes to the channel identified by chID byte. Returns false if the
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// send queue is full after timeout, specified by MConnection.
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func (p *peer) Send(chID byte, msgBytes []byte) bool {
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if !p.IsRunning() {
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// see Switch#Broadcast, where we fetch the list of peers and loop over
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// them - while we're looping, one peer may be removed and stopped.
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return false
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} else if !p.hasChannel(chID) {
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return false
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}
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res, err := p.conn.SendMessage(ChannelID(chID), msgBytes)
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if err == io.EOF {
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return false
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} else if err != nil {
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p.onError(err)
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return false
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}
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if res {
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labels := []string{
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"peer_id", string(p.ID()),
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"chID", fmt.Sprintf("%#x", chID),
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}
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p.metrics.PeerSendBytesTotal.With(labels...).Add(float64(len(msgBytes)))
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}
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return res
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}
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// TrySend msg bytes to the channel identified by chID byte. Immediately returns
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// false if the send queue is full.
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func (p *peer) TrySend(chID byte, msgBytes []byte) bool {
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if !p.IsRunning() {
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return false
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} else if !p.hasChannel(chID) {
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return false
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}
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res, err := p.conn.TrySendMessage(ChannelID(chID), msgBytes)
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if err == io.EOF {
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return false
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} else if err != nil {
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p.onError(err)
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return false
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}
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if res {
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labels := []string{
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"peer_id", string(p.ID()),
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"chID", fmt.Sprintf("%#x", chID),
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}
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p.metrics.PeerSendBytesTotal.With(labels...).Add(float64(len(msgBytes)))
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}
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return res
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}
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// Get the data for a given key.
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func (p *peer) Get(key string) interface{} {
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return p.Data.Get(key)
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}
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// Set sets the data for the given key.
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func (p *peer) Set(key string, data interface{}) {
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p.Data.Set(key, data)
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}
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// hasChannel returns true if the peer reported
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// knowing about the given chID.
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func (p *peer) hasChannel(chID byte) bool {
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for _, ch := range p.channels {
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if ch == chID {
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return true
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}
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}
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// NOTE: probably will want to remove this
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// but could be helpful while the feature is new
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p.Logger.Debug(
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"Unknown channel for peer",
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"channel",
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chID,
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"channels",
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p.channels,
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)
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return false
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}
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// CloseConn closes original connection. Used for cleaning up in cases where the peer had not been started at all.
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func (p *peer) CloseConn() error {
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return p.peerConn.conn.Close()
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}
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//---------------------------------------------------
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// methods only used for testing
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// TODO: can we remove these?
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// CloseConn closes the underlying connection
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func (pc *peerConn) CloseConn() {
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pc.conn.Close()
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}
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// RemoteAddr returns peer's remote network address.
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func (p *peer) RemoteAddr() net.Addr {
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endpoint := p.conn.RemoteEndpoint()
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return &net.TCPAddr{
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IP: endpoint.IP,
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Port: int(endpoint.Port),
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}
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}
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//---------------------------------------------------
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func PeerMetrics(metrics *Metrics) PeerOption {
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return func(p *peer) {
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p.metrics = metrics
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}
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}
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func (p *peer) metricsReporter() {
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for {
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select {
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case <-p.metricsTicker.C:
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status := p.conn.Status()
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var sendQueueSize float64
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for _, chStatus := range status.Channels {
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sendQueueSize += float64(chStatus.SendQueueSize)
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}
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p.metrics.PeerPendingSendBytes.With("peer_id", string(p.ID())).Set(sendQueueSize)
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case <-p.Quit():
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return
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}
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}
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}
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