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350 lines
8.2 KiB
350 lines
8.2 KiB
package p2p
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import (
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"fmt"
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"net"
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"sync/atomic"
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"time"
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cmn "github.com/tendermint/tendermint/libs/common"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/config"
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tmconn "github.com/tendermint/tendermint/p2p/conn"
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)
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var testIPSuffix uint32
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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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cmn.Service
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ID() ID // peer's cryptographic ID
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RemoteIP() net.IP // remote IP 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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NodeInfo() NodeInfo // peer's info
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Status() tmconn.ConnectionStatus
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OriginalAddr() *NetAddress
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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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config *config.P2PConfig
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conn net.Conn // source connection
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ip net.IP
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originalAddr *NetAddress // nil for inbound connections
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}
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// ID only exists for SecretConnection.
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// NOTE: Will panic if conn is not *SecretConnection.
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func (pc peerConn) ID() ID {
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return PubKeyToID(pc.conn.(*tmconn.SecretConnection).RemotePubKey())
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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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return pc.ip
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}
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// In test cases a conn could not be present at all or be an in-memory
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// implementation where we want to return a fake ip.
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if pc.conn == nil || pc.conn.RemoteAddr().String() == "pipe" {
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pc.ip = net.IP{172, 16, 0, byte(atomic.AddUint32(&testIPSuffix, 1))}
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return pc.ip
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}
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host, _, err := net.SplitHostPort(pc.conn.RemoteAddr().String())
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if err != nil {
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panic(err)
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}
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ips, err := net.LookupIP(host)
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if err != nil {
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panic(err)
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}
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pc.ip = ips[0]
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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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cmn.BaseService
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// raw peerConn and the multiplex connection
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peerConn
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mconn *tmconn.MConnection
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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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// User data
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Data *cmn.CMap
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}
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func newPeer(
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pc peerConn,
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mConfig tmconn.MConnConfig,
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nodeInfo NodeInfo,
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reactorsByCh map[byte]Reactor,
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chDescs []*tmconn.ChannelDescriptor,
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onPeerError func(Peer, interface{}),
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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,
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Data: cmn.NewCMap(),
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}
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p.mconn = createMConnection(
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pc.conn,
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p,
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reactorsByCh,
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chDescs,
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onPeerError,
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mConfig,
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)
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p.BaseService = *cmn.NewBaseService(nil, "Peer", p)
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return p
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}
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//---------------------------------------------------
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// Implements cmn.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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p.mconn.SetLogger(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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err := p.mconn.Start()
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return err
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}
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// OnStop implements BaseService.
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func (p *peer) OnStop() {
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p.BaseService.OnStop()
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p.mconn.Stop() // stop everything and close the conn
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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() ID {
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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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// OriginalAddr returns the original address, which was used to connect with
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// the peer. Returns nil for inbound peers.
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func (p *peer) OriginalAddr() *NetAddress {
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if p.peerConn.outbound {
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return p.peerConn.originalAddr
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}
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return nil
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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.mconn.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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return p.mconn.Send(chID, msgBytes)
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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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return p.mconn.TrySend(chID, msgBytes)
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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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//---------------------------------------------------
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// methods used by the Switch
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// CloseConn should be called by the Switch if the peer was created but never
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// started.
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func (pc *peerConn) CloseConn() {
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pc.conn.Close() // nolint: errcheck
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}
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// HandshakeTimeout performs the Tendermint P2P handshake between a given node
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// and the peer by exchanging their NodeInfo. It sets the received nodeInfo on
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// the peer.
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// NOTE: blocking
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func (pc *peerConn) HandshakeTimeout(
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ourNodeInfo NodeInfo,
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timeout time.Duration,
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) (peerNodeInfo NodeInfo, err error) {
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// Set deadline for handshake so we don't block forever on conn.ReadFull
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if err := pc.conn.SetDeadline(time.Now().Add(timeout)); err != nil {
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return peerNodeInfo, cmn.ErrorWrap(err, "Error setting deadline")
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}
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var trs, _ = cmn.Parallel(
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func(_ int) (val interface{}, err error, abort bool) {
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_, err = cdc.MarshalBinaryWriter(pc.conn, ourNodeInfo)
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return
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},
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func(_ int) (val interface{}, err error, abort bool) {
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_, err = cdc.UnmarshalBinaryReader(
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pc.conn,
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&peerNodeInfo,
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int64(MaxNodeInfoSize()),
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)
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return
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},
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)
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if err := trs.FirstError(); err != nil {
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return peerNodeInfo, cmn.ErrorWrap(err, "Error during handshake")
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}
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// Remove deadline
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if err := pc.conn.SetDeadline(time.Time{}); err != nil {
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return peerNodeInfo, cmn.ErrorWrap(err, "Error removing deadline")
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}
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return peerNodeInfo, nil
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}
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// Addr returns peer's remote network address.
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func (p *peer) Addr() net.Addr {
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return p.peerConn.conn.RemoteAddr()
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}
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// CanSend returns true if the send queue is not full, false otherwise.
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func (p *peer) CanSend(chID byte) bool {
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if !p.IsRunning() {
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return false
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}
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return p.mconn.CanSend(chID)
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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.mconn, p.ID())
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}
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return fmt.Sprintf("Peer{%v %v in}", p.mconn, p.ID())
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}
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//------------------------------------------------------------------
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// helper funcs
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func createMConnection(
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conn net.Conn,
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p *peer,
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reactorsByCh map[byte]Reactor,
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chDescs []*tmconn.ChannelDescriptor,
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onPeerError func(Peer, interface{}),
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config tmconn.MConnConfig,
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) *tmconn.MConnection {
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onReceive := func(chID byte, msgBytes []byte) {
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reactor := reactorsByCh[chID]
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if reactor == nil {
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// Note that its ok to panic here as it's caught in the conn._recover,
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// which does onPeerError.
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panic(fmt.Sprintf("Unknown channel %X", chID))
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}
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reactor.Receive(chID, p, msgBytes)
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}
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onError := func(r interface{}) {
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onPeerError(p, r)
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}
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return tmconn.NewMConnectionWithConfig(
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conn,
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chDescs,
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onReceive,
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onError,
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config,
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)
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}
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