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package p2p
import (
"fmt"
"io"
"net"
"time"
"github.com/pkg/errors"
crypto "github.com/tendermint/go-crypto"
wire "github.com/tendermint/go-wire"
cmn "github.com/tendermint/tmlibs/common"
)
// Peer is an interface representing a peer connected on a reactor.
type Peer interface {
cmn.Service
Key() string
IsOutbound() bool
IsPersistent() bool
NodeInfo() *NodeInfo
Status() ConnectionStatus
Send(byte, interface{}) bool
TrySend(byte, interface{}) bool
Set(string, interface{})
Get(string) interface{}
}
// Peer could be marked as persistent, in which case you can use
// Redial function to reconnect. Note that inbound peers can't be
// made persistent. They should be made persistent on the other end.
//
// Before using a peer, you will need to perform a handshake on connection.
type peer struct {
cmn.BaseService
outbound bool
conn net.Conn // source connection
mconn *MConnection // multiplex connection
persistent bool
config *PeerConfig
nodeInfo *NodeInfo
key string
Data *cmn.CMap // User data.
}
// PeerConfig is a Peer configuration.
type PeerConfig struct {
AuthEnc bool `mapstructure:"auth_enc"` // authenticated encryption
// times are in seconds
HandshakeTimeout time.Duration `mapstructure:"handshake_timeout"`
DialTimeout time.Duration `mapstructure:"dial_timeout"`
MConfig *MConnConfig `mapstructure:"connection"`
Fuzz bool `mapstructure:"fuzz"` // fuzz connection (for testing)
FuzzConfig *FuzzConnConfig `mapstructure:"fuzz_config"`
}
// DefaultPeerConfig returns the default config.
func DefaultPeerConfig() *PeerConfig {
return &PeerConfig{
AuthEnc: true,
HandshakeTimeout: 20, // * time.Second,
DialTimeout: 3, // * time.Second,
MConfig: DefaultMConnConfig(),
Fuzz: false,
FuzzConfig: DefaultFuzzConnConfig(),
}
}
func newOutboundPeer(addr *NetAddress, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor,
onPeerError func(Peer, interface{}), ourNodePrivKey crypto.PrivKeyEd25519, config *PeerConfig) (*peer, error) {
conn, err := dial(addr, config)
if err != nil {
return nil, errors.Wrap(err, "Error creating peer")
}
peer, err := newPeerFromConnAndConfig(conn, true, reactorsByCh, chDescs, onPeerError, ourNodePrivKey, config)
if err != nil {
conn.Close()
return nil, err
}
return peer, nil
}
func newInboundPeer(conn net.Conn, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor,
onPeerError func(Peer, interface{}), ourNodePrivKey crypto.PrivKeyEd25519, config *PeerConfig) (*peer, error) {
return newPeerFromConnAndConfig(conn, false, reactorsByCh, chDescs, onPeerError, ourNodePrivKey, config)
}
func newPeerFromConnAndConfig(rawConn net.Conn, outbound bool, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor,
onPeerError func(Peer, interface{}), ourNodePrivKey crypto.PrivKeyEd25519, config *PeerConfig) (*peer, error) {
conn := rawConn
// Fuzz connection
if config.Fuzz {
// so we have time to do peer handshakes and get set up
conn = FuzzConnAfterFromConfig(conn, 10*time.Second, config.FuzzConfig)
}
// Encrypt connection
if config.AuthEnc {
conn.SetDeadline(time.Now().Add(config.HandshakeTimeout * time.Second))
var err error
conn, err = MakeSecretConnection(conn, ourNodePrivKey)
if err != nil {
return nil, errors.Wrap(err, "Error creating peer")
}
}
// Key and NodeInfo are set after Handshake
p := &peer{
outbound: outbound,
conn: conn,
config: config,
Data: cmn.NewCMap(),
}
p.mconn = createMConnection(conn, p, reactorsByCh, chDescs, onPeerError, config.MConfig)
p.BaseService = *cmn.NewBaseService(nil, "Peer", p)
return p, nil
}
// CloseConn should be used when the peer was created, but never started.
func (p *peer) CloseConn() {
p.conn.Close()
}
// makePersistent marks the peer as persistent.
func (p *peer) makePersistent() {
if !p.outbound {
panic("inbound peers can't be made persistent")
}
p.persistent = true
}
// IsPersistent returns true if the peer is persitent, false otherwise.
func (p *peer) IsPersistent() bool {
return p.persistent
}
// HandshakeTimeout performs a handshake between a given node and the peer.
// NOTE: blocking
func (p *peer) HandshakeTimeout(ourNodeInfo *NodeInfo, timeout time.Duration) error {
// Set deadline for handshake so we don't block forever on conn.ReadFull
p.conn.SetDeadline(time.Now().Add(timeout))
var peerNodeInfo = new(NodeInfo)
var err1 error
var err2 error
cmn.Parallel(
func() {
var n int
wire.WriteBinary(ourNodeInfo, p.conn, &n, &err1)
},
func() {
var n int
wire.ReadBinary(peerNodeInfo, p.conn, maxNodeInfoSize, &n, &err2)
p.Logger.Info("Peer handshake", "peerNodeInfo", peerNodeInfo)
})
if err1 != nil {
return errors.Wrap(err1, "Error during handshake/write")
}
if err2 != nil {
return errors.Wrap(err2, "Error during handshake/read")
}
if p.config.AuthEnc {
// Check that the professed PubKey matches the sconn's.
if !peerNodeInfo.PubKey.Equals(p.PubKey().Wrap()) {
return fmt.Errorf("Ignoring connection with unmatching pubkey: %v vs %v",
peerNodeInfo.PubKey, p.PubKey())
}
}
// Remove deadline
p.conn.SetDeadline(time.Time{})
peerNodeInfo.RemoteAddr = p.Addr().String()
p.nodeInfo = peerNodeInfo
p.key = peerNodeInfo.PubKey.KeyString()
return nil
}
// Addr returns peer's remote network address.
func (p *peer) Addr() net.Addr {
return p.conn.RemoteAddr()
}
// PubKey returns peer's public key.
func (p *peer) PubKey() crypto.PubKeyEd25519 {
if p.config.AuthEnc {
return p.conn.(*SecretConnection).RemotePubKey()
}
if p.NodeInfo() == nil {
panic("Attempt to get peer's PubKey before calling Handshake")
}
return p.PubKey()
}
// OnStart implements BaseService.
func (p *peer) OnStart() error {
p.BaseService.OnStart()
_, err := p.mconn.Start()
return err
}
// OnStop implements BaseService.
func (p *peer) OnStop() {
p.BaseService.OnStop()
p.mconn.Stop()
}
// Connection returns underlying MConnection.
func (p *peer) Connection() *MConnection {
return p.mconn
}
// IsOutbound returns true if the connection is outbound, false otherwise.
func (p *peer) IsOutbound() bool {
return p.outbound
}
// Send msg to the channel identified by chID byte. Returns false if the send
// queue is full after timeout, specified by MConnection.
func (p *peer) Send(chID byte, msg interface{}) bool {
if !p.IsRunning() {
// see Switch#Broadcast, where we fetch the list of peers and loop over
// them - while we're looping, one peer may be removed and stopped.
return false
}
return p.mconn.Send(chID, msg)
}
// TrySend msg to the channel identified by chID byte. Immediately returns
// false if the send queue is full.
func (p *peer) TrySend(chID byte, msg interface{}) bool {
if !p.IsRunning() {
return false
}
return p.mconn.TrySend(chID, msg)
}
// CanSend returns true if the send queue is not full, false otherwise.
func (p *peer) CanSend(chID byte) bool {
if !p.IsRunning() {
return false
}
return p.mconn.CanSend(chID)
}
// WriteTo writes the peer's public key to w.
func (p *peer) WriteTo(w io.Writer) (int64, error) {
var n int
var err error
wire.WriteString(p.key, w, &n, &err)
return int64(n), err
}
// String representation.
func (p *peer) String() string {
if p.outbound {
return fmt.Sprintf("Peer{%v %v out}", p.mconn, p.key[:12])
}
return fmt.Sprintf("Peer{%v %v in}", p.mconn, p.key[:12])
}
// Equals reports whenever 2 peers are actually represent the same node.
func (p *peer) Equals(other Peer) bool {
return p.key == other.Key()
}
// Get the data for a given key.
func (p *peer) Get(key string) interface{} {
return p.Data.Get(key)
}
// Set sets the data for the given key.
func (p *peer) Set(key string, data interface{}) {
p.Data.Set(key, data)
}
// Key returns the peer's id key.
func (p *peer) Key() string {
return p.key
}
// NodeInfo returns a copy of the peer's NodeInfo.
func (p *peer) NodeInfo() *NodeInfo {
if p.nodeInfo == nil {
return nil
}
n := *p.nodeInfo // copy
return &n
}
// Status returns the peer's ConnectionStatus.
func (p *peer) Status() ConnectionStatus {
return p.mconn.Status()
}
func dial(addr *NetAddress, config *PeerConfig) (net.Conn, error) {
conn, err := addr.DialTimeout(config.DialTimeout * time.Second)
if err != nil {
return nil, err
}
return conn, nil
}
func createMConnection(conn net.Conn, p *peer, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor,
onPeerError func(Peer, interface{}), config *MConnConfig) *MConnection {
onReceive := func(chID byte, msgBytes []byte) {
reactor := reactorsByCh[chID]
if reactor == nil {
cmn.PanicSanity(cmn.Fmt("Unknown channel %X", chID))
}
reactor.Receive(chID, p, msgBytes)
}
onError := func(r interface{}) {
onPeerError(p, r)
}
return NewMConnectionWithConfig(conn, chDescs, onReceive, onError, config)
}