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package p2p
import (
"fmt"
"net"
"time"
"github.com/pkg/errors"
crypto "github.com/tendermint/go-crypto"
wire "github.com/tendermint/go-wire"
cmn "github.com/tendermint/tmlibs/common"
"github.com/tendermint/tmlibs/log"
)
// Peer is an interface representing a peer connected on a reactor.
type Peer interface {
cmn.Service
ID() ID // peer's cryptographic ID
IsOutbound() bool // did we dial the peer
IsPersistent() bool // do we redial this peer when we disconnect
NodeInfo() NodeInfo // peer's info
Status() ConnectionStatus
Send(byte, interface{}) bool
TrySend(byte, interface{}) bool
Set(string, interface{})
Get(string) interface{}
}
//----------------------------------------------------------
// peer implements Peer.
//
// 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
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.PrivKey, config *PeerConfig, persistent bool) (*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 {
if err := conn.Close(); err != nil {
return nil, err
}
return nil, err
}
peer.persistent = persistent
return peer, nil
}
func newInboundPeer(conn net.Conn, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor,
onPeerError func(Peer, interface{}), ourNodePrivKey crypto.PrivKey, config *PeerConfig) (*peer, error) {
// TODO: issue PoW challenge
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.PrivKey, 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 {
if err := conn.SetDeadline(time.Now().Add(config.HandshakeTimeout * time.Second)); err != nil {
return nil, errors.Wrap(err, "Error setting deadline while encrypting connection")
}
var err error
conn, err = MakeSecretConnection(conn, ourNodePrivKey)
if err != nil {
return nil, errors.Wrap(err, "Error creating peer")
}
}
// NodeInfo is 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
}
//---------------------------------------------------
// Implements cmn.Service
// SetLogger implements BaseService.
func (p *peer) SetLogger(l log.Logger) {
p.Logger = l
p.mconn.SetLogger(l)
}
// OnStart implements BaseService.
func (p *peer) OnStart() error {
if err := p.BaseService.OnStart(); err != nil {
return err
}
err := p.mconn.Start()
return err
}
// OnStop implements BaseService.
func (p *peer) OnStop() {
p.BaseService.OnStop()
p.mconn.Stop() // stop everything and close the conn
}
//---------------------------------------------------
// Implements Peer
// ID returns the peer's ID - the hex encoded hash of its pubkey.
func (p *peer) ID() ID {
return PubKeyToID(p.PubKey())
}
// IsOutbound returns true if the connection is outbound, false otherwise.
func (p *peer) IsOutbound() bool {
return p.outbound
}
// IsPersistent returns true if the peer is persitent, false otherwise.
func (p *peer) IsPersistent() bool {
return p.persistent
}
// NodeInfo returns a copy of the peer's NodeInfo.
func (p *peer) NodeInfo() NodeInfo {
return p.nodeInfo
}
// Status returns the peer's ConnectionStatus.
func (p *peer) Status() ConnectionStatus {
return p.mconn.Status()
}
// 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)
}
// 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)
}
//---------------------------------------------------
// methods used by the Switch
// CloseConn should be called by the Switch if the peer was created but never started.
func (p *peer) CloseConn() {
p.conn.Close() // nolint: errcheck
}
// HandshakeTimeout performs the Tendermint P2P handshake between a given node and the peer
// by exchanging their NodeInfo. It sets the received nodeInfo on 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
if err := p.conn.SetDeadline(time.Now().Add(timeout)); err != nil {
return errors.Wrap(err, "Error setting deadline")
}
var peerNodeInfo 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")
}
// Remove deadline
if err := p.conn.SetDeadline(time.Time{}); err != nil {
return errors.Wrap(err, "Error removing deadline")
}
// TODO: fix the peerNodeInfo.ListenAddr
p.nodeInfo = peerNodeInfo
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.PubKey {
if !p.nodeInfo.PubKey.Empty() {
return p.nodeInfo.PubKey
} else if p.config.AuthEnc {
return p.conn.(*SecretConnection).RemotePubKey()
}
panic("Attempt to get peer's PubKey before calling Handshake")
}
// 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)
}
// String representation.
func (p *peer) String() string {
if p.outbound {
return fmt.Sprintf("Peer{%v %v out}", p.mconn, p.ID())
}
return fmt.Sprintf("Peer{%v %v in}", p.mconn, p.ID())
}
//------------------------------------------------------------------
// helper funcs
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)
}