Official Go implementation of the Ethereum protocol
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go-ethereum/peer.go

853 lines
20 KiB

package eth
import (
"bytes"
"container/list"
"fmt"
"math"
"math/big"
"net"
"strconv"
"strings"
"sync/atomic"
"time"
"github.com/ethereum/eth-go/ethchain"
"github.com/ethereum/eth-go/ethlog"
"github.com/ethereum/eth-go/ethutil"
"github.com/ethereum/eth-go/ethwire"
)
var peerlogger = ethlog.NewLogger("PEER")
const (
// The size of the output buffer for writing messages
outputBufferSize = 50
// Current protocol version
ProtocolVersion = 33
// Current P2P version
P2PVersion = 0
// Ethereum network version
NetVersion = 0
// Interval for ping/pong message
pingPongTimer = 2 * time.Second
)
type DiscReason byte
const (
// Values are given explicitly instead of by iota because these values are
// defined by the wire protocol spec; it is easier for humans to ensure
// correctness when values are explicit.
DiscReRequested = 0x00
DiscReTcpSysErr = 0x01
DiscBadProto = 0x02
DiscBadPeer = 0x03
DiscTooManyPeers = 0x04
DiscConnDup = 0x05
DiscGenesisErr = 0x06
DiscProtoErr = 0x07
DiscQuitting = 0x08
)
var discReasonToString = []string{
"requested",
"TCP sys error",
"bad protocol",
"useless peer",
"too many peers",
"already connected",
"wrong genesis block",
"incompatible network",
"quitting",
}
func (d DiscReason) String() string {
if len(discReasonToString) < int(d) {
return "Unknown"
}
return discReasonToString[d]
}
// Peer capabilities
type Caps byte
const (
CapPeerDiscTy Caps = 1 << iota
CapTxTy
CapChainTy
CapDefault = CapChainTy | CapTxTy | CapPeerDiscTy
)
var capsToString = map[Caps]string{
CapPeerDiscTy: "Peer discovery",
CapTxTy: "Transaction relaying",
CapChainTy: "Block chain relaying",
}
func (c Caps) IsCap(cap Caps) bool {
return c&cap > 0
}
func (c Caps) String() string {
var caps []string
if c.IsCap(CapPeerDiscTy) {
caps = append(caps, capsToString[CapPeerDiscTy])
}
if c.IsCap(CapChainTy) {
caps = append(caps, capsToString[CapChainTy])
}
if c.IsCap(CapTxTy) {
caps = append(caps, capsToString[CapTxTy])
}
return strings.Join(caps, " | ")
}
type Peer struct {
// Ethereum interface
ethereum *Ethereum
// Net connection
conn net.Conn
// Output queue which is used to communicate and handle messages
outputQueue chan *ethwire.Msg
// Quit channel
quit chan bool
// Determines whether it's an inbound or outbound peer
inbound bool
// Flag for checking the peer's connectivity state
connected int32
disconnect int32
// Last known message send
lastSend time.Time
// Indicated whether a verack has been send or not
// This flag is used by writeMessage to check if messages are allowed
// to be send or not. If no version is known all messages are ignored.
versionKnown bool
statusKnown bool
// Last received pong message
lastPong int64
lastBlockReceived time.Time
host []byte
port uint16
caps Caps
td *big.Int
bestHash []byte
lastReceivedHash []byte
requestedHashes [][]byte
// This peer's public key
pubkey []byte
// Indicated whether the node is catching up or not
catchingUp bool
diverted bool
blocksRequested int
version string
// We use this to give some kind of pingtime to a node, not very accurate, could be improved.
pingTime time.Duration
pingStartTime time.Time
lastRequestedBlock *ethchain.Block
}
func NewPeer(conn net.Conn, ethereum *Ethereum, inbound bool) *Peer {
pubkey := ethereum.KeyManager().PublicKey()[1:]
return &Peer{
outputQueue: make(chan *ethwire.Msg, outputBufferSize),
quit: make(chan bool),
ethereum: ethereum,
conn: conn,
inbound: inbound,
disconnect: 0,
connected: 1,
port: 30303,
pubkey: pubkey,
blocksRequested: 10,
caps: ethereum.ServerCaps(),
version: ethereum.ClientIdentity().String(),
}
}
func NewOutboundPeer(addr string, ethereum *Ethereum, caps Caps) *Peer {
p := &Peer{
outputQueue: make(chan *ethwire.Msg, outputBufferSize),
quit: make(chan bool),
ethereum: ethereum,
inbound: false,
connected: 0,
disconnect: 0,
port: 30303,
caps: caps,
version: ethereum.ClientIdentity().String(),
}
// Set up the connection in another goroutine so we don't block the main thread
go func() {
conn, err := p.Connect(addr)
if err != nil {
peerlogger.Debugln("Connection to peer failed. Giving up.", err)
p.Stop()
return
}
p.conn = conn
// Atomically set the connection state
atomic.StoreInt32(&p.connected, 1)
atomic.StoreInt32(&p.disconnect, 0)
p.Start()
}()
return p
}
func (self *Peer) Connect(addr string) (conn net.Conn, err error) {
const maxTries = 3
for attempts := 0; attempts < maxTries; attempts++ {
conn, err = net.DialTimeout("tcp", addr, 10*time.Second)
if err != nil {
//peerlogger.Debugf("Peer connection failed. Retrying (%d/%d) (%s)\n", attempts+1, maxTries, addr)
time.Sleep(time.Duration(attempts*20) * time.Second)
continue
}
// Success
return
}
return
}
// Getters
func (p *Peer) PingTime() string {
return p.pingTime.String()
}
func (p *Peer) Inbound() bool {
return p.inbound
}
func (p *Peer) LastSend() time.Time {
return p.lastSend
}
func (p *Peer) LastPong() int64 {
return p.lastPong
}
func (p *Peer) Host() []byte {
return p.host
}
func (p *Peer) Port() uint16 {
return p.port
}
func (p *Peer) Version() string {
return p.version
}
func (p *Peer) Connected() *int32 {
return &p.connected
}
// Setters
func (p *Peer) SetVersion(version string) {
p.version = version
}
// Outputs any RLP encoded data to the peer
func (p *Peer) QueueMessage(msg *ethwire.Msg) {
if atomic.LoadInt32(&p.connected) != 1 {
return
}
p.outputQueue <- msg
}
func (p *Peer) writeMessage(msg *ethwire.Msg) {
// Ignore the write if we're not connected
if atomic.LoadInt32(&p.connected) != 1 {
return
}
if !p.versionKnown {
switch msg.Type {
case ethwire.MsgHandshakeTy: // Ok
default: // Anything but ack is allowed
return
}
} else {
/*
if !p.statusKnown {
switch msg.Type {
case ethwire.MsgStatusTy: // Ok
default: // Anything but ack is allowed
return
}
}
*/
}
peerlogger.DebugDetailf("(%v) <= %v\n", p.conn.RemoteAddr(), formatMessage(msg))
err := ethwire.WriteMessage(p.conn, msg)
if err != nil {
peerlogger.Debugln(" Can't send message:", err)
// Stop the client if there was an error writing to it
p.Stop()
return
}
}
// Outbound message handler. Outbound messages are handled here
func (p *Peer) HandleOutbound() {
// The ping timer. Makes sure that every 2 minutes a ping is send to the peer
pingTimer := time.NewTicker(pingPongTimer)
serviceTimer := time.NewTicker(5 * time.Minute)
out:
for {
select {
// Main message queue. All outbound messages are processed through here
case msg := <-p.outputQueue:
if !p.statusKnown {
switch msg.Type {
case ethwire.MsgGetTxsTy, ethwire.MsgGetBlockHashesTy, ethwire.MsgGetBlocksTy, ethwire.MsgBlockHashesTy, ethwire.MsgBlockTy:
peerlogger.Debugln("Blocked outgoing [eth] message to peer without the [eth] cap.")
break
}
}
p.writeMessage(msg)
p.lastSend = time.Now()
// Ping timer
case <-pingTimer.C:
/*
timeSince := time.Since(time.Unix(p.lastPong, 0))
if !p.pingStartTime.IsZero() && p.lastPong != 0 && timeSince > (pingPongTimer+30*time.Second) {
peerlogger.Infof("Peer did not respond to latest pong fast enough, it took %s, disconnecting.\n", timeSince)
p.Stop()
return
}
*/
p.writeMessage(ethwire.NewMessage(ethwire.MsgPingTy, ""))
p.pingStartTime = time.Now()
// Service timer takes care of peer broadcasting, transaction
// posting or block posting
case <-serviceTimer.C:
if p.caps&CapPeerDiscTy > 0 {
msg := p.peersMessage()
p.ethereum.BroadcastMsg(msg)
}
case <-p.quit:
// Break out of the for loop if a quit message is posted
break out
}
}
clean:
// This loop is for draining the output queue and anybody waiting for us
for {
select {
case <-p.outputQueue:
// TODO
default:
break clean
}
}
}
func formatMessage(msg *ethwire.Msg) (ret string) {
ret = fmt.Sprintf("%v %v", msg.Type, msg.Data)
/*
XXX Commented out because I need the log level here to determine
if i should or shouldn't generate this message
*/
/*
switch msg.Type {
case ethwire.MsgPeersTy:
ret += fmt.Sprintf("(%d entries)", msg.Data.Len())
case ethwire.MsgBlockTy:
b1, b2 := ethchain.NewBlockFromRlpValue(msg.Data.Get(0)), ethchain.NewBlockFromRlpValue(msg.Data.Get(msg.Data.Len()-1))
ret += fmt.Sprintf("(%d entries) %x - %x", msg.Data.Len(), b1.Hash()[0:4], b2.Hash()[0:4])
case ethwire.MsgBlockHashesTy:
h1, h2 := msg.Data.Get(0).Bytes(), msg.Data.Get(msg.Data.Len()-1).Bytes()
ret += fmt.Sprintf("(%d entries) %x - %x", msg.Data.Len(), h1, h2)
}
*/
return
}
// Inbound handler. Inbound messages are received here and passed to the appropriate methods
func (p *Peer) HandleInbound() {
for atomic.LoadInt32(&p.disconnect) == 0 {
// HMM?
time.Sleep(50 * time.Millisecond)
// Wait for a message from the peer
msgs, err := ethwire.ReadMessages(p.conn)
if err != nil {
peerlogger.Debugln(err)
}
for _, msg := range msgs {
peerlogger.DebugDetailf("(%v) => %v\n", p.conn.RemoteAddr(), formatMessage(msg))
switch msg.Type {
case ethwire.MsgHandshakeTy:
// Version message
p.handleHandshake(msg)
//if p.caps.IsCap(CapPeerDiscTy) {
p.QueueMessage(ethwire.NewMessage(ethwire.MsgGetPeersTy, ""))
//}
case ethwire.MsgDiscTy:
p.Stop()
peerlogger.Infoln("Disconnect peer: ", DiscReason(msg.Data.Get(0).Uint()))
case ethwire.MsgPingTy:
// Respond back with pong
p.QueueMessage(ethwire.NewMessage(ethwire.MsgPongTy, ""))
case ethwire.MsgPongTy:
// If we received a pong back from a peer we set the
// last pong so the peer handler knows this peer is still
// active.
p.lastPong = time.Now().Unix()
p.pingTime = time.Since(p.pingStartTime)
case ethwire.MsgTxTy:
// If the message was a transaction queue the transaction
// in the TxPool where it will undergo validation and
// processing when a new block is found
for i := 0; i < msg.Data.Len(); i++ {
tx := ethchain.NewTransactionFromValue(msg.Data.Get(i))
p.ethereum.TxPool().QueueTransaction(tx)
}
case ethwire.MsgGetPeersTy:
// Peer asked for list of connected peers
p.pushPeers()
case ethwire.MsgPeersTy:
// Received a list of peers (probably because MsgGetPeersTy was send)
data := msg.Data
// Create new list of possible peers for the ethereum to process
peers := make([]string, data.Len())
// Parse each possible peer
for i := 0; i < data.Len(); i++ {
value := data.Get(i)
peers[i] = unpackAddr(value.Get(0), value.Get(1).Uint())
}
// Connect to the list of peers
p.ethereum.ProcessPeerList(peers)
case ethwire.MsgStatusTy:
// Handle peer's status msg
p.handleStatus(msg)
}
// TMP
if p.statusKnown {
switch msg.Type {
case ethwire.MsgGetTxsTy:
// Get the current transactions of the pool
txs := p.ethereum.TxPool().CurrentTransactions()
// Get the RlpData values from the txs
txsInterface := make([]interface{}, len(txs))
for i, tx := range txs {
txsInterface[i] = tx.RlpData()
}
// Broadcast it back to the peer
p.QueueMessage(ethwire.NewMessage(ethwire.MsgTxTy, txsInterface))
case ethwire.MsgGetBlockHashesTy:
if msg.Data.Len() < 2 {
peerlogger.Debugln("err: argument length invalid ", msg.Data.Len())
}
hash := msg.Data.Get(0).Bytes()
amount := msg.Data.Get(1).Uint()
hashes := p.ethereum.BlockChain().GetChainHashesFromHash(hash, amount)
p.QueueMessage(ethwire.NewMessage(ethwire.MsgBlockHashesTy, ethutil.ByteSliceToInterface(hashes)))
case ethwire.MsgGetBlocksTy:
// Limit to max 300 blocks
max := int(math.Min(float64(msg.Data.Len()), 300.0))
var blocks []interface{}
for i := 0; i < max; i++ {
hash := msg.Data.Get(i).Bytes()
block := p.ethereum.BlockChain().GetBlock(hash)
if block != nil {
blocks = append(blocks, block.Value().Raw())
}
}
p.QueueMessage(ethwire.NewMessage(ethwire.MsgBlockTy, blocks))
case ethwire.MsgBlockHashesTy:
p.catchingUp = true
blockPool := p.ethereum.blockPool
foundCommonHash := false
it := msg.Data.NewIterator()
for it.Next() {
hash := it.Value().Bytes()
if blockPool.HasCommonHash(hash) {
foundCommonHash = true
break
}
blockPool.AddHash(hash)
p.lastReceivedHash = hash
p.lastBlockReceived = time.Now()
}
if foundCommonHash || msg.Data.Len() == 0 {
p.FetchBlocks()
} else {
p.FetchHashes()
}
case ethwire.MsgBlockTy:
p.catchingUp = true
blockPool := p.ethereum.blockPool
it := msg.Data.NewIterator()
for it.Next() {
block := ethchain.NewBlockFromRlpValue(it.Value())
//fmt.Printf("%v %x - %x\n", block.Number, block.Hash()[0:4], block.PrevHash[0:4])
blockPool.SetBlock(block, p)
p.lastBlockReceived = time.Now()
}
var err error
blockPool.CheckLinkAndProcess(func(block *ethchain.Block) {
err = p.ethereum.StateManager().Process(block, false)
})
if err != nil {
peerlogger.Infoln(err)
} else {
// Don't trigger if there's just one block.
if blockPool.Len() != 0 && msg.Data.Len() > 1 {
p.FetchBlocks()
}
}
}
}
}
}
p.Stop()
}
func (self *Peer) FetchBlocks() {
blockPool := self.ethereum.blockPool
hashes := blockPool.Take(100, self)
if len(hashes) > 0 {
self.QueueMessage(ethwire.NewMessage(ethwire.MsgGetBlocksTy, ethutil.ByteSliceToInterface(hashes)))
}
}
func (self *Peer) FetchHashes() {
blockPool := self.ethereum.blockPool
if self.td.Cmp(blockPool.td) >= 0 {
blockPool.td = self.td
if !blockPool.HasLatestHash() {
self.QueueMessage(ethwire.NewMessage(ethwire.MsgGetBlockHashesTy, []interface{}{self.lastReceivedHash, uint32(256)}))
}
}
}
// General update method
func (self *Peer) update() {
serviceTimer := time.NewTicker(5 * time.Second)
out:
for {
select {
case <-serviceTimer.C:
if time.Since(self.lastBlockReceived) > 10*time.Second {
self.catchingUp = false
}
case <-self.quit:
break out
}
}
serviceTimer.Stop()
}
func (p *Peer) Start() {
peerHost, peerPort, _ := net.SplitHostPort(p.conn.LocalAddr().String())
servHost, servPort, _ := net.SplitHostPort(p.conn.RemoteAddr().String())
if p.inbound {
p.host, p.port = packAddr(peerHost, peerPort)
} else {
p.host, p.port = packAddr(servHost, servPort)
}
err := p.pushHandshake()
if err != nil {
peerlogger.Debugln("Peer can't send outbound version ack", err)
p.Stop()
return
}
go p.HandleOutbound()
// Run the inbound handler in a new goroutine
go p.HandleInbound()
// Run the general update handler
go p.update()
// Wait a few seconds for startup and then ask for an initial ping
time.Sleep(2 * time.Second)
p.writeMessage(ethwire.NewMessage(ethwire.MsgPingTy, ""))
p.pingStartTime = time.Now()
}
func (p *Peer) Stop() {
if atomic.AddInt32(&p.disconnect, 1) != 1 {
return
}
close(p.quit)
if atomic.LoadInt32(&p.connected) != 0 {
p.writeMessage(ethwire.NewMessage(ethwire.MsgDiscTy, ""))
p.conn.Close()
}
// Pre-emptively remove the peer; don't wait for reaping. We already know it's dead if we are here
p.ethereum.RemovePeer(p)
}
func (p *Peer) peersMessage() *ethwire.Msg {
outPeers := make([]interface{}, len(p.ethereum.InOutPeers()))
// Serialise each peer
for i, peer := range p.ethereum.InOutPeers() {
// Don't return localhost as valid peer
if !net.ParseIP(peer.conn.RemoteAddr().String()).IsLoopback() {
outPeers[i] = peer.RlpData()
}
}
// Return the message to the peer with the known list of connected clients
return ethwire.NewMessage(ethwire.MsgPeersTy, outPeers)
}
// Pushes the list of outbound peers to the client when requested
func (p *Peer) pushPeers() {
p.QueueMessage(p.peersMessage())
}
func (self *Peer) pushStatus() {
msg := ethwire.NewMessage(ethwire.MsgStatusTy, []interface{}{
uint32(ProtocolVersion),
uint32(NetVersion),
self.ethereum.BlockChain().TD,
self.ethereum.BlockChain().CurrentBlock.Hash(),
self.ethereum.BlockChain().Genesis().Hash(),
})
self.QueueMessage(msg)
}
func (self *Peer) handleStatus(msg *ethwire.Msg) {
c := msg.Data
var (
protoVersion = c.Get(0).Uint()
netVersion = c.Get(1).Uint()
td = c.Get(2).BigInt()
bestHash = c.Get(3).Bytes()
genesis = c.Get(4).Bytes()
)
if bytes.Compare(self.ethereum.BlockChain().Genesis().Hash(), genesis) != 0 {
ethlogger.Warnf("Invalid genisis hash %x. Disabling [eth]\n", genesis)
return
}
if netVersion != NetVersion {
ethlogger.Warnf("Invalid network version %d. Disabling [eth]\n", netVersion)
return
}
if protoVersion != ProtocolVersion {
ethlogger.Warnf("Invalid protocol version %d. Disabling [eth]\n", protoVersion)
return
}
// Get the td and last hash
self.td = td
self.bestHash = bestHash
self.lastReceivedHash = bestHash
self.statusKnown = true
// Compare the total TD with the blockchain TD. If remote is higher
// fetch hashes from highest TD node.
if self.td.Cmp(self.ethereum.BlockChain().TD) > 0 {
self.ethereum.blockPool.AddHash(self.lastReceivedHash)
self.FetchHashes()
}
ethlogger.Infof("Peer is [eth] capable. (TD = %v ~ %x) %d / %d", self.td, self.bestHash, protoVersion, netVersion)
}
func (p *Peer) pushHandshake() error {
pubkey := p.ethereum.KeyManager().PublicKey()
msg := ethwire.NewMessage(ethwire.MsgHandshakeTy, []interface{}{
P2PVersion, []byte(p.version), []interface{}{"eth"}, p.port, pubkey[1:],
})
p.QueueMessage(msg)
return nil
}
func (p *Peer) handleHandshake(msg *ethwire.Msg) {
c := msg.Data
var (
p2pVersion = c.Get(0).Uint()
clientId = c.Get(1).Str()
caps = c.Get(2)
port = c.Get(3).Uint()
pub = c.Get(4).Bytes()
)
// Check correctness of p2p protocol version
if p2pVersion != P2PVersion {
peerlogger.Debugf("Invalid P2P version. Require protocol %d, received %d\n", P2PVersion, p2pVersion)
p.Stop()
return
}
// Handle the pub key (validation, uniqueness)
if len(pub) == 0 {
peerlogger.Warnln("Pubkey required, not supplied in handshake.")
p.Stop()
return
}
usedPub := 0
// This peer is already added to the peerlist so we expect to find a double pubkey at least once
eachPeer(p.ethereum.Peers(), func(peer *Peer, e *list.Element) {
if bytes.Compare(pub, peer.pubkey) == 0 {
usedPub++
}
})
if usedPub > 0 {
peerlogger.Debugf("Pubkey %x found more then once. Already connected to client.", p.pubkey)
p.Stop()
return
}
p.pubkey = pub
// If this is an inbound connection send an ack back
if p.inbound {
p.port = uint16(port)
// Self connect detection
pubkey := p.ethereum.KeyManager().PublicKey()
if bytes.Compare(pubkey, p.pubkey) == 0 {
p.Stop()
return
}
}
p.SetVersion(clientId)
p.versionKnown = true
p.ethereum.PushPeer(p)
p.ethereum.reactor.Post("peerList", p.ethereum.Peers())
capsIt := caps.NewIterator()
var capsStrs []string
for capsIt.Next() {
cap := capsIt.Value().Str()
switch cap {
case "eth":
p.pushStatus()
}
capsStrs = append(capsStrs, cap)
}
ethlogger.Infof("Added peer (%s) %d / %d (%v)\n", p.conn.RemoteAddr(), p.ethereum.Peers().Len(), p.ethereum.MaxPeers, capsStrs)
peerlogger.Debugln(p)
}
func (p *Peer) String() string {
var strBoundType string
if p.inbound {
strBoundType = "inbound"
} else {
strBoundType = "outbound"
}
var strConnectType string
if atomic.LoadInt32(&p.disconnect) == 0 {
strConnectType = "connected"
} else {
strConnectType = "disconnected"
}
return fmt.Sprintf("[%s] (%s) %v %s [%s]", strConnectType, strBoundType, p.conn.RemoteAddr(), p.version, p.caps)
}
func (p *Peer) RlpData() []interface{} {
return []interface{}{p.host, p.port, p.pubkey}
}
func packAddr(address, port string) ([]byte, uint16) {
addr := strings.Split(address, ".")
a, _ := strconv.Atoi(addr[0])
b, _ := strconv.Atoi(addr[1])
c, _ := strconv.Atoi(addr[2])
d, _ := strconv.Atoi(addr[3])
host := []byte{byte(a), byte(b), byte(c), byte(d)}
prt, _ := strconv.Atoi(port)
return host, uint16(prt)
}
func unpackAddr(value *ethutil.Value, p uint64) string {
byts := value.Bytes()
a := strconv.Itoa(int(byts[0]))
b := strconv.Itoa(int(byts[1]))
c := strconv.Itoa(int(byts[2]))
d := strconv.Itoa(int(byts[3]))
host := strings.Join([]string{a, b, c, d}, ".")
port := strconv.Itoa(int(p))
return net.JoinHostPort(host, port)
}