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345 lines
8.7 KiB
345 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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"time"
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"github.com/pkg/errors"
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crypto "github.com/tendermint/go-crypto"
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wire "github.com/tendermint/go-wire"
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cmn "github.com/tendermint/tmlibs/common"
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)
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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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Key() string
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IsOutbound() bool
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IsPersistent() bool
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NodeInfo() *NodeInfo
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Status() ConnectionStatus
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Send(byte, interface{}) bool
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TrySend(byte, interface{}) bool
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Set(string, interface{})
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Get(string) interface{}
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}
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// Peer could be marked as persistent, in which case you can use
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// Redial function to reconnect. Note that inbound peers can't be
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// made persistent. They should be made persistent on the other end.
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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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outbound bool
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conn net.Conn // source connection
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mconn *MConnection // multiplex connection
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persistent bool
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config *PeerConfig
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nodeInfo *NodeInfo
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key string
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Data *cmn.CMap // User data.
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}
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// PeerConfig is a Peer configuration.
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type PeerConfig struct {
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AuthEnc bool `mapstructure:"auth_enc"` // authenticated encryption
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// times are in seconds
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HandshakeTimeout time.Duration `mapstructure:"handshake_timeout"`
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DialTimeout time.Duration `mapstructure:"dial_timeout"`
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MConfig *MConnConfig `mapstructure:"connection"`
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Fuzz bool `mapstructure:"fuzz"` // fuzz connection (for testing)
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FuzzConfig *FuzzConnConfig `mapstructure:"fuzz_config"`
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}
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// DefaultPeerConfig returns the default config.
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func DefaultPeerConfig() *PeerConfig {
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return &PeerConfig{
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AuthEnc: true,
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HandshakeTimeout: 20, // * time.Second,
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DialTimeout: 3, // * time.Second,
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MConfig: DefaultMConnConfig(),
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Fuzz: false,
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FuzzConfig: DefaultFuzzConnConfig(),
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}
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}
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func newOutboundPeer(addr *NetAddress, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor,
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onPeerError func(Peer, interface{}), ourNodePrivKey crypto.PrivKeyEd25519, config *PeerConfig) (*peer, error) {
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conn, err := dial(addr, config)
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if err != nil {
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return nil, errors.Wrap(err, "Error creating peer")
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}
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peer, err := newPeerFromConnAndConfig(conn, true, reactorsByCh, chDescs, onPeerError, ourNodePrivKey, config)
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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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return peer, nil
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}
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func newInboundPeer(conn net.Conn, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor,
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onPeerError func(Peer, interface{}), ourNodePrivKey crypto.PrivKeyEd25519, config *PeerConfig) (*peer, error) {
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return newPeerFromConnAndConfig(conn, false, reactorsByCh, chDescs, onPeerError, ourNodePrivKey, config)
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}
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func newPeerFromConnAndConfig(rawConn net.Conn, outbound bool, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor,
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onPeerError func(Peer, interface{}), ourNodePrivKey crypto.PrivKeyEd25519, config *PeerConfig) (*peer, error) {
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conn := rawConn
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// Fuzz connection
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if config.Fuzz {
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// so we have time to do peer handshakes and get set up
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conn = FuzzConnAfterFromConfig(conn, 10*time.Second, config.FuzzConfig)
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}
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// Encrypt connection
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if config.AuthEnc {
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conn.SetDeadline(time.Now().Add(config.HandshakeTimeout * time.Second))
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var err error
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conn, err = MakeSecretConnection(conn, ourNodePrivKey)
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if err != nil {
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return nil, errors.Wrap(err, "Error creating peer")
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}
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}
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// Key and NodeInfo are set after Handshake
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p := &peer{
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outbound: outbound,
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conn: conn,
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config: config,
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Data: cmn.NewCMap(),
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}
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p.mconn = createMConnection(conn, p, reactorsByCh, chDescs, onPeerError, config.MConfig)
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p.BaseService = *cmn.NewBaseService(nil, "Peer", p)
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return p, nil
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}
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// CloseConn should be used when the peer was created, but never started.
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func (p *peer) CloseConn() {
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p.conn.Close()
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}
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// makePersistent marks the peer as persistent.
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func (p *peer) makePersistent() {
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if !p.outbound {
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panic("inbound peers can't be made persistent")
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}
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p.persistent = true
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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.persistent
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}
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// HandshakeTimeout performs a handshake between a given node and the peer.
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// NOTE: blocking
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func (p *peer) HandshakeTimeout(ourNodeInfo *NodeInfo, timeout time.Duration) error {
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// Set deadline for handshake so we don't block forever on conn.ReadFull
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p.conn.SetDeadline(time.Now().Add(timeout))
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var peerNodeInfo = new(NodeInfo)
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var err1 error
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var err2 error
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cmn.Parallel(
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func() {
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var n int
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wire.WriteBinary(ourNodeInfo, p.conn, &n, &err1)
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},
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func() {
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var n int
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wire.ReadBinary(peerNodeInfo, p.conn, maxNodeInfoSize, &n, &err2)
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p.Logger.Info("Peer handshake", "peerNodeInfo", peerNodeInfo)
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})
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if err1 != nil {
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return errors.Wrap(err1, "Error during handshake/write")
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}
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if err2 != nil {
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return errors.Wrap(err2, "Error during handshake/read")
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}
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if p.config.AuthEnc {
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// Check that the professed PubKey matches the sconn's.
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if !peerNodeInfo.PubKey.Equals(p.PubKey().Wrap()) {
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return fmt.Errorf("Ignoring connection with unmatching pubkey: %v vs %v",
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peerNodeInfo.PubKey, p.PubKey())
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}
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}
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// Remove deadline
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p.conn.SetDeadline(time.Time{})
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peerNodeInfo.RemoteAddr = p.Addr().String()
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p.nodeInfo = peerNodeInfo
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p.key = peerNodeInfo.PubKey.KeyString()
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return 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.conn.RemoteAddr()
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}
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// PubKey returns peer's public key.
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func (p *peer) PubKey() crypto.PubKeyEd25519 {
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if p.config.AuthEnc {
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return p.conn.(*SecretConnection).RemotePubKey()
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}
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if p.NodeInfo() == nil {
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panic("Attempt to get peer's PubKey before calling Handshake")
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}
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return p.PubKey()
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}
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// OnStart implements BaseService.
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func (p *peer) OnStart() error {
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p.BaseService.OnStart()
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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()
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}
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// Connection returns underlying MConnection.
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func (p *peer) Connection() *MConnection {
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return p.mconn
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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.outbound
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}
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// Send msg to the channel identified by chID byte. Returns false if the send
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// queue is full after timeout, specified by MConnection.
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func (p *peer) Send(chID byte, msg interface{}) 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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}
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return p.mconn.Send(chID, msg)
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}
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// TrySend msg 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, msg interface{}) 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.TrySend(chID, msg)
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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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// WriteTo writes the peer's public key to w.
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func (p *peer) WriteTo(w io.Writer) (int64, error) {
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var n int
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var err error
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wire.WriteString(p.key, w, &n, &err)
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return int64(n), 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.mconn, p.key[:12])
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}
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return fmt.Sprintf("Peer{%v %v in}", p.mconn, p.key[:12])
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}
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// Equals reports whenever 2 peers are actually represent the same node.
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func (p *peer) Equals(other Peer) bool {
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return p.key == other.Key()
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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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// Key returns the peer's id key.
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func (p *peer) Key() string {
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return p.key
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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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if p.nodeInfo == nil {
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return nil
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}
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n := *p.nodeInfo // copy
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return &n
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}
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// Status returns the peer's ConnectionStatus.
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func (p *peer) Status() ConnectionStatus {
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return p.mconn.Status()
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}
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func dial(addr *NetAddress, config *PeerConfig) (net.Conn, error) {
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conn, err := addr.DialTimeout(config.DialTimeout * time.Second)
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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func createMConnection(conn net.Conn, p *peer, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor,
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onPeerError func(Peer, interface{}), config *MConnConfig) *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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cmn.PanicSanity(cmn.Fmt("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 NewMConnectionWithConfig(conn, chDescs, onReceive, onError, config)
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}
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