plugeth/peer.go

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package eth
import (
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"bytes"
"container/list"
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"fmt"
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"github.com/ethereum/eth-go/ethchain"
"github.com/ethereum/eth-go/ethutil"
"github.com/ethereum/eth-go/ethwire"
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"net"
"strconv"
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"strings"
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"sync/atomic"
"time"
)
const (
// The size of the output buffer for writing messages
outputBufferSize = 50
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// Current protocol version
ProtocolVersion = 17
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)
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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.
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DiscReRequested = 0x00
DiscReTcpSysErr = 0x01
DiscBadProto = 0x02
DiscBadPeer = 0x03
DiscTooManyPeers = 0x04
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DiscConnDup = 0x05
DiscGenesisErr = 0x06
DiscProtoErr = 0x07
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)
var discReasonToString = []string{
"Disconnect requested",
"Disconnect TCP sys error",
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"Disconnect bad protocol",
"Disconnect useless peer",
"Disconnect too many peers",
"Disconnect already connected",
"Disconnect wrong genesis block",
"Disconnect incompatible network",
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}
func (d DiscReason) String() string {
if len(discReasonToString) < int(d) {
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return "Unknown"
}
return discReasonToString[d]
}
// Peer capabilities
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type Caps byte
const (
CapPeerDiscTy = 1 << iota
CapTxTy
CapChainTy
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CapDefault = CapChainTy | CapTxTy | CapPeerDiscTy
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)
var capsToString = map[Caps]string{
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CapPeerDiscTy: "Peer discovery",
CapTxTy: "Transaction relaying",
CapChainTy: "Block chain relaying",
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}
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func (c Caps) IsCap(cap Caps) bool {
return c&cap > 0
}
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func (c Caps) String() string {
var caps []string
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if c.IsCap(CapPeerDiscTy) {
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caps = append(caps, capsToString[CapPeerDiscTy])
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}
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if c.IsCap(CapChainTy) {
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caps = append(caps, capsToString[CapChainTy])
}
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if c.IsCap(CapTxTy) {
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caps = append(caps, capsToString[CapTxTy])
}
return strings.Join(caps, " | ")
}
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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
// Last received pong message
lastPong int64
// Indicates whether a MsgGetPeersTy was requested of the peer
// this to prevent receiving false peers.
requestedPeerList bool
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host []byte
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port uint16
caps Caps
pubkey []byte
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// Indicated whether the node is catching up or not
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catchingUp bool
diverted bool
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blocksRequested int
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Version string
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}
func NewPeer(conn net.Conn, ethereum *Ethereum, inbound bool) *Peer {
pubkey := ethutil.GetKeyRing().Get(0).PublicKey[1:]
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return &Peer{
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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(),
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}
}
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func NewOutboundPeer(addr string, ethereum *Ethereum, caps Caps) *Peer {
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p := &Peer{
outputQueue: make(chan *ethwire.Msg, outputBufferSize),
quit: make(chan bool),
ethereum: ethereum,
inbound: false,
connected: 0,
disconnect: 0,
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caps: caps,
Version: ethutil.Config.ClientString,
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}
// Set up the connection in another goroutine so we don't block the main thread
go func() {
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conn, err := net.DialTimeout("tcp", addr, 30*time.Second)
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if err != nil {
ethutil.Config.Log.Debugln("Connection to peer failed", err)
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p.Stop()
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return
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}
p.conn = conn
// Atomically set the connection state
atomic.StoreInt32(&p.connected, 1)
atomic.StoreInt32(&p.disconnect, 0)
p.Start()
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}()
return p
}
// Outputs any RLP encoded data to the peer
func (p *Peer) QueueMessage(msg *ethwire.Msg) {
if atomic.LoadInt32(&p.connected) != 1 {
return
}
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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
}
}
err := ethwire.WriteMessage(p.conn, msg)
if err != nil {
ethutil.Config.Log.Debugln("Can't send message:", err)
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// 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
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pingTimer := time.NewTicker(2 * time.Minute)
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serviceTimer := time.NewTicker(5 * time.Minute)
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out:
for {
select {
// Main message queue. All outbound messages are processed through here
case msg := <-p.outputQueue:
p.writeMessage(msg)
p.lastSend = time.Now()
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// Ping timer sends a ping to the peer each 2 minutes
case <-pingTimer.C:
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p.writeMessage(ethwire.NewMessage(ethwire.MsgPingTy, ""))
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// Service timer takes care of peer broadcasting, transaction
// posting or block posting
case <-serviceTimer.C:
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if p.caps&CapPeerDiscTy > 0 {
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msg := p.peersMessage()
p.ethereum.BroadcastMsg(msg)
}
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case <-p.quit:
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// Break out of the for loop if a quit message is posted
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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
}
}
}
// Inbound handler. Inbound messages are received here and passed to the appropriate methods
func (p *Peer) HandleInbound() {
for atomic.LoadInt32(&p.disconnect) == 0 {
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// HMM?
time.Sleep(500 * time.Millisecond)
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// Wait for a message from the peer
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msgs, err := ethwire.ReadMessages(p.conn)
if err != nil {
ethutil.Config.Log.Debugln(err)
}
for _, msg := range msgs {
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switch msg.Type {
case ethwire.MsgHandshakeTy:
// Version message
p.handleHandshake(msg)
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if p.caps.IsCap(CapPeerDiscTy) {
p.QueueMessage(ethwire.NewMessage(ethwire.MsgGetPeersTy, ""))
}
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case ethwire.MsgDiscTy:
p.Stop()
ethutil.Config.Log.Infoln("Disconnect peer:", DiscReason(msg.Data.Get(0).Uint()))
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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
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var block, lastBlock *ethchain.Block
var err error
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// Make sure we are actually receiving anything
if msg.Data.Len()-1 > 1 && p.diverted {
// We requested blocks and now we need to make sure we have a common ancestor somewhere in these blocks so we can find
// common ground to start syncing from
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lastBlock = ethchain.NewBlockFromRlpValue(msg.Data.Get(msg.Data.Len() - 1))
ethutil.Config.Log.Infof("[PEER] Last block: %x. Checking if we have it locally.\n", lastBlock.Hash())
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for i := msg.Data.Len() - 1; i >= 0; i-- {
block = ethchain.NewBlockFromRlpValue(msg.Data.Get(i))
// Do we have this block on our chain? If so we can continue
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if !p.ethereum.StateManager().BlockChain().HasBlock(block.Hash()) {
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// We don't have this block, but we do have a block with the same prevHash, diversion time!
if p.ethereum.StateManager().BlockChain().HasBlockWithPrevHash(block.PrevHash) {
p.diverted = false
if !p.ethereum.StateManager().BlockChain().FindCanonicalChainFromMsg(msg, block.PrevHash) {
p.SyncWithPeerToLastKnown()
}
break
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}
}
}
if !p.ethereum.StateManager().BlockChain().HasBlock(lastBlock.Hash()) {
// If we can't find a common ancenstor we need to request more blocks.
// FIXME: At one point this won't scale anymore since we are not asking for an offset
// we just keep increasing the amount of blocks.
p.blocksRequested = p.blocksRequested * 2
ethutil.Config.Log.Infof("[PEER] No common ancestor found, requesting %d more blocks.\n", p.blocksRequested)
p.catchingUp = false
p.FindCommonParentBlock()
break
}
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}
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for i := msg.Data.Len() - 1; i >= 0; i-- {
block = ethchain.NewBlockFromRlpValue(msg.Data.Get(i))
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//p.ethereum.StateManager().PrepareDefault(block)
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//state := p.ethereum.StateManager().CurrentState()
err = p.ethereum.StateManager().Process(block, false)
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if err != nil {
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if ethutil.Config.Debug {
ethutil.Config.Log.Infof("[PEER] Block %x failed\n", block.Hash())
ethutil.Config.Log.Infof("[PEER] %v\n", err)
ethutil.Config.Log.Debugln(block)
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}
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break
} else {
lastBlock = block
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}
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}
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if msg.Data.Len() == 0 {
// Set catching up to false if
// the peer has nothing left to give
p.catchingUp = false
}
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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 since we don't know the parent")
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p.catchingUp = false
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p.CatchupWithPeer(p.ethereum.BlockChain().CurrentBlock.Hash())
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} else if ethchain.IsValidationErr(err) {
fmt.Println("Err:", err)
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p.catchingUp = false
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}
} else {
// If we're catching up, try to catch up further.
if p.catchingUp && msg.Data.Len() > 1 {
if lastBlock != nil {
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blockInfo := lastBlock.BlockInfo()
ethutil.Config.Log.Debugf("Synced to block height #%d %x %x\n", blockInfo.Number, lastBlock.Hash(), blockInfo.Hash)
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}
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p.catchingUp = false
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hash := p.ethereum.BlockChain().CurrentBlock.Hash()
p.CatchupWithPeer(hash)
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}
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}
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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
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for i := 0; i < msg.Data.Len(); i++ {
tx := ethchain.NewTransactionFromValue(msg.Data.Get(i))
p.ethereum.TxPool().QueueTransaction(tx)
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}
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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
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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())
}
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// Connect to the list of peers
p.ethereum.ProcessPeerList(peers)
// Mark unrequested again
p.requestedPeerList = false
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}
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case ethwire.MsgGetChainTy:
var parent *ethchain.Block
// Length minus one since the very last element in the array is a count
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l := msg.Data.Len() - 1
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// Ignore empty get chains
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if l == 0 {
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break
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}
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// Amount of parents in the canonical chain
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//amountOfBlocks := msg.Data.Get(l).AsUint()
amountOfBlocks := uint64(100)
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// Check each SHA block hash from the message and determine whether
// the SHA is in the database
for i := 0; i < l; i++ {
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if data := msg.Data.Get(i).Bytes(); p.ethereum.StateManager().BlockChain().HasBlock(data) {
parent = p.ethereum.BlockChain().GetBlock(data)
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break
}
}
// If a parent is found send back a reply
if parent != nil {
ethutil.Config.Log.Debugf("[PEER] Found canonical block, returning chain from: %x ", parent.Hash())
chain := p.ethereum.BlockChain().GetChainFromHash(parent.Hash(), amountOfBlocks)
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if len(chain) > 0 {
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ethutil.Config.Log.Debugf("[PEER] Returning %d blocks: %x ", len(chain), parent.Hash())
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p.QueueMessage(ethwire.NewMessage(ethwire.MsgBlockTy, chain))
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} else {
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p.QueueMessage(ethwire.NewMessage(ethwire.MsgBlockTy, []interface{}{}))
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}
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} else {
//ethutil.Config.Log.Debugf("[PEER] Could not find a similar block")
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// 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)
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//log.Printf("Sending not in chain with hash %x\n", lastHash.AsRaw())
p.QueueMessage(ethwire.NewMessage(ethwire.MsgNotInChainTy, []interface{}{lastHash.Raw()}))
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}
case ethwire.MsgNotInChainTy:
ethutil.Config.Log.Debugf("Not in chain: %x\n", msg.Data.Get(0).Bytes())
if p.diverted == true {
// If were already looking for a common parent and we get here again we need to go deeper
p.blocksRequested = p.blocksRequested * 2
}
p.diverted = true
p.catchingUp = false
p.FindCommonParentBlock()
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))
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// Unofficial but fun nonetheless
case ethwire.MsgTalkTy:
ethutil.Config.Log.Infoln("%v says: %s\n", p.conn.RemoteAddr(), msg.Data.Str())
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}
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}
}
p.Stop()
}
func (p *Peer) Start() {
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peerHost, peerPort, _ := net.SplitHostPort(p.conn.LocalAddr().String())
servHost, servPort, _ := net.SplitHostPort(p.conn.RemoteAddr().String())
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if p.inbound {
p.host, p.port = packAddr(peerHost, peerPort)
} else {
p.host, p.port = packAddr(servHost, servPort)
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}
err := p.pushHandshake()
if err != nil {
ethutil.Config.Log.Debugln("Peer can't send outbound version ack", err)
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p.Stop()
return
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}
// Run the outbound handler in a new goroutine
go p.HandleOutbound()
// Run the inbound handler in a new goroutine
go p.HandleInbound()
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}
func (p *Peer) Stop() {
if atomic.AddInt32(&p.disconnect, 1) != 1 {
return
}
close(p.quit)
if atomic.LoadInt32(&p.connected) != 0 {
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p.writeMessage(ethwire.NewMessage(ethwire.MsgDiscTy, ""))
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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.peerMut.Lock()
defer p.ethereum.peerMut.Unlock()
eachPeer(p.ethereum.peers, func(peer *Peer, e *list.Element) {
if peer == p {
p.ethereum.peers.Remove(e)
}
})
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}
func (p *Peer) pushHandshake() error {
keyRing := ethutil.GetKeyRing().Get(0)
if keyRing != nil {
pubkey := keyRing.PublicKey
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msg := ethwire.NewMessage(ethwire.MsgHandshakeTy, []interface{}{
uint32(ProtocolVersion), uint32(0), p.Version, byte(p.caps), p.port, pubkey[1:],
})
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p.QueueMessage(msg)
}
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return nil
}
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func (p *Peer) peersMessage() *ethwire.Msg {
outPeers := make([]interface{}, len(p.ethereum.InOutPeers()))
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// 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()
}
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}
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// Return the message to the peer with the known list of connected clients
return ethwire.NewMessage(ethwire.MsgPeersTy, outPeers)
}
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// Pushes the list of outbound peers to the client when requested
func (p *Peer) pushPeers() {
p.QueueMessage(p.peersMessage())
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}
func (p *Peer) handleHandshake(msg *ethwire.Msg) {
c := msg.Data
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if c.Get(0).Uint() != ProtocolVersion {
ethutil.Config.Log.Debugln("Invalid peer version. Require protocol:", ProtocolVersion)
p.Stop()
return
}
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// [PROTOCOL_VERSION, NETWORK_ID, CLIENT_ID, CAPS, PORT, PUBKEY]
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p.versionKnown = true
// If this is an inbound connection send an ack back
if p.inbound {
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p.pubkey = c.Get(5).Bytes()
p.port = uint16(c.Get(4).Uint())
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// Self connect detection
keyPair := ethutil.GetKeyRing().Get(0)
if bytes.Compare(keyPair.PublicKey, p.pubkey) == 0 {
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p.Stop()
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return
}
}
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// Set the peer's caps
p.caps = Caps(c.Get(3).Byte())
// Get a reference to the peers version
p.Version = c.Get(2).Str()
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// Catch up with the connected peer
if !p.ethereum.IsUpToDate() {
ethutil.Config.Log.Debugln("Already syncing up with a peer; sleeping")
time.Sleep(10 * time.Second)
}
p.SyncWithPeerToLastKnown()
ethutil.Config.Log.Debugln("[PEER]", p)
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}
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"
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}
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return fmt.Sprintf("[%s] (%s) %v %s [%s]", strConnectType, strBoundType, p.conn.RemoteAddr(), p.Version, p.caps)
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}
func (p *Peer) SyncWithPeerToLastKnown() {
p.catchingUp = false
p.CatchupWithPeer(p.ethereum.BlockChain().CurrentBlock.Hash())
}
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func (p *Peer) FindCommonParentBlock() {
if p.catchingUp {
return
}
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p.catchingUp = true
if p.blocksRequested == 0 {
p.blocksRequested = 20
}
blocks := p.ethereum.BlockChain().GetChain(p.ethereum.BlockChain().CurrentBlock.Hash(), p.blocksRequested)
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var hashes []interface{}
for _, block := range blocks {
hashes = append(hashes, block.Hash())
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}
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msgInfo := append(hashes, uint64(len(hashes)))
ethutil.Config.Log.Infof("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)
}
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func (p *Peer) CatchupWithPeer(blockHash []byte) {
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if !p.catchingUp {
// Make sure nobody else is catching up when you want to do this
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p.catchingUp = true
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msg := ethwire.NewMessage(ethwire.MsgGetChainTy, []interface{}{blockHash, uint64(50)})
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p.QueueMessage(msg)
ethutil.Config.Log.Debugf("Requesting blockchain %x... from peer %s\n", p.ethereum.BlockChain().CurrentBlock.Hash()[:4], p.conn.RemoteAddr())
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msg = ethwire.NewMessage(ethwire.MsgGetTxsTy, []interface{}{})
p.QueueMessage(msg)
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}
}
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func (p *Peer) RlpData() []interface{} {
return []interface{}{p.host, p.port, p.pubkey}
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}
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func packAddr(address, port string) ([]byte, uint16) {
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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)}
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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]))
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host := strings.Join([]string{a, b, c, d}, ".")
port := strconv.Itoa(int(p))
return net.JoinHostPort(host, port)
}