func (p *Peer) CatchupWithPeer(blockHash []byte) {
if !p.catchingUp {
// Make sure nobody else is catching up when you want to do this
p.catchingUp = true
msg := ethwire.NewMessage(ethwire.MsgGetChainTy, []interface{}{blockHash, uint64(100)})
p.QueueMessage(msg)
peerlogger.DebugDetailf("Requesting blockchain %x... from peer %s\n", p.ethereum.BlockChain().CurrentBlock.Hash()[:4], p.conn.RemoteAddr())
msg = ethwire.NewMessage(ethwire.MsgGetTxsTy, []interface{}{})
p.QueueMessage(msg)
}
}
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 (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 (p *Peer) CatchupWithPeer() {
if !p.catchingUp {
p.catchingUp = true
msg := ethwire.NewMessage(ethwire.MsgGetChainTy, []interface{}{p.ethereum.BlockManager.BlockChain().CurrentBlock.Hash(), uint64(50)})
p.QueueMessage(msg)
ethutil.Config.Log.Debugf("Requesting blockchain %x...\n", p.ethereum.BlockManager.BlockChain().CurrentBlock.Hash()[:4])
}
}
func (p *Peer) peersMessage() *ethwire.Msg {
outPeers := make([]interface{}, len(p.ethereum.InOutPeers()))
// Serialise each peer
for i, peer := range p.ethereum.InOutPeers() {
outPeers[i] = peer.RlpData()
}
// Return the message to the peer with the known list of connected clients
return ethwire.NewMessage(ethwire.MsgPeersTy, outPeers)
}
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()
}
}
func (p *Peer) pushHandshake() error {
pubkey := p.ethereum.KeyManager().PublicKey()
msg := ethwire.NewMessage(ethwire.MsgHandshakeTy, []interface{}{
uint32(ProtocolVersion), uint32(0), []byte(p.version), byte(p.caps), p.port, pubkey[1:],
p.ethereum.BlockChain().TD.Uint64(), p.ethereum.BlockChain().CurrentBlock.Hash(),
})
p.QueueMessage(msg)
return nil
}
func (self *Peer) FetchHashes() {
blockPool := self.ethereum.blockPool
if self.td.Cmp(blockPool.td) >= 0 {
peerlogger.Debugf("Requesting hashes from %x\n", self.lastReceivedHash)
if !blockPool.HasLatestHash() {
self.QueueMessage(ethwire.NewMessage(ethwire.MsgGetBlockHashesTy, []interface{}{self.lastReceivedHash, uint32(200)}))
}
}
}
func (p *Peer) pushHandshake() error {
data, _ := ethutil.Config.Db.Get([]byte("KeyRing"))
pubkey := ethutil.NewValueFromBytes(data).Get(2).Bytes()
msg := ethwire.NewMessage(ethwire.MsgHandshakeTy, []interface{}{
uint32(ProtocolVersion), uint32(0), p.Version, byte(p.caps), p.port, pubkey,
})
p.QueueMessage(msg)
return nil
}
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)
}
// 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:
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 (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)
}
// 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(2 * time.Minute)
serviceTimer := time.NewTicker(5 * time.Minute)
out:
for {
select {
// Main message queue. All outbound messages are processed through here
case msg := <-p.outputQueue:
p.writeMessage(msg)
p.lastSend = time.Now()
// Ping timer sends a ping to the peer each 2 minutes
case <-pingTimer.C:
p.writeMessage(ethwire.NewMessage(ethwire.MsgPingTy, ""))
// 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 (p *Peer) FindCommonParentBlock() {
if p.catchingUp {
return
}
p.catchingUp = true
if p.blocksRequested == 0 {
p.blocksRequested = 20
}
blocks := p.ethereum.BlockChain().GetChain(p.ethereum.BlockChain().CurrentBlock.Hash(), p.blocksRequested)
var hashes []interface{}
for _, block := range blocks {
hashes = append(hashes, block.Hash())
}
msgInfo := append(hashes, uint64(len(hashes)))
peerlogger.DebugDetailf("Asking for block from %x (%d total) from %s\n", p.ethereum.BlockChain().CurrentBlock.Hash(), len(hashes), p.conn.RemoteAddr().String())
msg := ethwire.NewMessage(ethwire.MsgGetChainTy, msgInfo)
p.QueueMessage(msg)
}
// 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 %v\n", p.conn.RemoteAddr(), msg.Type, msg.Data)
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.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 {
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())
blockPool.SetBlock(block)
p.lastBlockReceived = time.Now()
}
linked := blockPool.CheckLinkAndProcess(func(block *ethchain.Block) {
p.ethereum.StateManager().Process(block, false)
})
if !linked {
p.FetchBlocks()
}
}
}
}
p.Stop()
}
func (s *Ethereum) Broadcast(msgType ethwire.MsgType, data []interface{}) {
msg := ethwire.NewMessage(msgType, data)
s.BroadcastMsg(msg)
}
// 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(500 * time.Millisecond)
// Wait for a message from the peer
msgs, err := ethwire.ReadMessages(p.conn)
if err != nil {
ethutil.Config.Log.Debugln(err)
}
for _, msg := range msgs {
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()
ethutil.Config.Log.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()
case ethwire.MsgBlockTy:
// Get all blocks and process them
var block, lastBlock *ethchain.Block
var err error
for i := msg.Data.Len() - 1; i >= 0; i-- {
block = ethchain.NewBlockFromRlpValue(msg.Data.Get(i))
err = p.ethereum.BlockManager.ProcessBlock(block)
if err != nil {
if ethutil.Config.Debug {
ethutil.Config.Log.Infof("[PEER] Block %x failed\n", block.Hash())
ethutil.Config.Log.Infof("[PEER] %v\n", err)
}
break
} else {
lastBlock = block
}
}
if err != nil {
// If the parent is unknown try to catch up with this peer
if ethchain.IsParentErr(err) {
ethutil.Config.Log.Infoln("Attempting to catch up")
p.catchingUp = false
p.CatchupWithPeer()
} else if ethchain.IsValidationErr(err) {
// TODO
}
} else {
// XXX Do we want to catch up if there were errors?
// If we're catching up, try to catch up further.
if p.catchingUp && msg.Data.Len() > 1 {
if ethutil.Config.Debug && lastBlock != nil {
blockInfo := lastBlock.BlockInfo()
ethutil.Config.Log.Infof("Synced to block height #%d %x %x\n", blockInfo.Number, lastBlock.Hash(), blockInfo.Hash)
}
p.catchingUp = false
p.CatchupWithPeer()
}
}
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++ {
p.ethereum.TxPool.QueueTransaction(ethchain.NewTransactionFromData(msg.Data.Get(i).Encode()))
}
case ethwire.MsgGetPeersTy:
// Flag this peer as a 'requested of new peers' this to
// prevent malicious peers being forced.
p.requestedPeerList = true
// Peer asked for list of connected peers
p.pushPeers()
case ethwire.MsgPeersTy:
// Received a list of peers (probably because MsgGetPeersTy was send)
// Only act on message if we actually requested for a peers list
//if p.requestedPeerList {
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)
// Mark unrequested again
p.requestedPeerList = false
//}
case ethwire.MsgGetChainTy:
var parent *ethchain.Block
// Length minus one since the very last element in the array is a count
l := msg.Data.Len() - 1
// Ignore empty get chains
if l == 0 {
break
}
// Amount of parents in the canonical chain
//amountOfBlocks := msg.Data.Get(l).AsUint()
amountOfBlocks := uint64(100)
// Check each SHA block hash from the message and determine whether
// the SHA is in the database
for i := 0; i < l; i++ {
if data := msg.Data.Get(i).Bytes(); p.ethereum.BlockManager.BlockChain().HasBlock(data) {
parent = p.ethereum.BlockManager.BlockChain().GetBlock(data)
break
}
}
// If a parent is found send back a reply
if parent != nil {
chain := p.ethereum.BlockManager.BlockChain().GetChainFromHash(parent.Hash(), amountOfBlocks)
p.QueueMessage(ethwire.NewMessage(ethwire.MsgBlockTy, chain))
} else {
// If no blocks are found we send back a reply with msg not in chain
// and the last hash from get chain
lastHash := msg.Data.Get(l - 1)
//log.Printf("Sending not in chain with hash %x\n", lastHash.AsRaw())
p.QueueMessage(ethwire.NewMessage(ethwire.MsgNotInChainTy, []interface{}{lastHash.Raw()}))
}
case ethwire.MsgNotInChainTy:
ethutil.Config.Log.Infof("Not in chain %x\n", msg.Data)
// TODO
// Unofficial but fun nonetheless
case ethwire.MsgTalkTy:
ethutil.Config.Log.Infoln("%v says: %s\n", p.conn.RemoteAddr(), msg.Data.Str())
}
}
}
p.Stop()
}