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304 lines
8.4 KiB
304 lines
8.4 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 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
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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 // authenticated encryption
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HandshakeTimeout time.Duration
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DialTimeout time.Duration
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MConfig *MConnConfig
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Fuzz bool // fuzz connection (for testing)
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FuzzConfig *FuzzConnConfig
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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: 2 * 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, onPeerError func(*Peer, interface{}), ourNodePrivKey crypto.PrivKeyEd25519) (*Peer, error) {
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return newOutboundPeerWithConfig(addr, reactorsByCh, chDescs, onPeerError, ourNodePrivKey, DefaultPeerConfig())
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}
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func newOutboundPeerWithConfig(addr *NetAddress, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor, 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, onPeerError func(*Peer, interface{}), ourNodePrivKey crypto.PrivKeyEd25519) (*Peer, error) {
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return newInboundPeerWithConfig(conn, reactorsByCh, chDescs, onPeerError, ourNodePrivKey, DefaultPeerConfig())
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}
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func newInboundPeerWithConfig(conn net.Conn, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor, 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, 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))
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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(log, "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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log.Notice("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 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) (n int64, err error) {
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var n_ int
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wire.WriteString(p.Key, w, &n_, &err)
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n += int64(n_)
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return
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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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func dial(addr *NetAddress, config *PeerConfig) (net.Conn, error) {
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log.Info("Dialing address", "address", addr)
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conn, err := addr.DialTimeout(config.DialTimeout)
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if err != nil {
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log.Info("Failed dialing address", "address", addr, "error", err)
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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, 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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