mirror of https://github.com/poanetwork/quorum.git
509 lines
13 KiB
Go
509 lines
13 KiB
Go
package eth
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import (
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"bytes"
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"github.com/ethereum/ethchain-go"
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"github.com/ethereum/ethutil-go"
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"github.com/ethereum/ethwire-go"
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"log"
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"net"
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"strconv"
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"strings"
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"sync/atomic"
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"time"
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)
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const (
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// The size of the output buffer for writing messages
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outputBufferSize = 50
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)
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type DiscReason byte
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const (
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DiscReRequested = 0x00
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DiscReTcpSysErr = 0x01
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DiscBadProto = 0x02
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DiscBadPeer = 0x03
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DiscTooManyPeers = 0x04
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)
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var discReasonToString = []string{
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"Disconnect requested",
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"Disconnect TCP sys error",
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"Disconnect Bad protocol",
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"Disconnect Useless peer",
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"Disconnect Too many peers",
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}
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func (d DiscReason) String() string {
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if len(discReasonToString) > int(d) {
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return "Unknown"
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}
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return discReasonToString[d]
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}
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// Peer capabilities
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type Caps byte
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const (
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CapPeerDiscTy = 0x01
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CapTxTy = 0x02
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CapChainTy = 0x04
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CapDefault = CapChainTy | CapTxTy | CapPeerDiscTy
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)
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var capsToString = map[Caps]string{
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CapPeerDiscTy: "Peer discovery",
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CapTxTy: "Transaction relaying",
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CapChainTy: "Block chain relaying",
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}
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func (c Caps) IsCap(cap Caps) bool {
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return c&cap > 0
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}
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func (c Caps) String() string {
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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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}
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if c.IsCap(CapTxTy) {
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caps = append(caps, capsToString[CapTxTy])
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}
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return strings.Join(caps, " | ")
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}
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type Peer struct {
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// Ethereum interface
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ethereum *Ethereum
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// Net connection
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conn net.Conn
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// Output queue which is used to communicate and handle messages
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outputQueue chan *ethwire.Msg
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// Quit channel
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quit chan bool
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// Determines whether it's an inbound or outbound peer
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inbound bool
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// Flag for checking the peer's connectivity state
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connected int32
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disconnect int32
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// Last known message send
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lastSend time.Time
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// Indicated whether a verack has been send or not
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// This flag is used by writeMessage to check if messages are allowed
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// to be send or not. If no version is known all messages are ignored.
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versionKnown bool
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// Last received pong message
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lastPong int64
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// Indicates whether a MsgGetPeersTy was requested of the peer
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// this to prevent receiving false peers.
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requestedPeerList bool
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host []interface{}
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port uint16
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caps Caps
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pubkey []byte
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// Indicated whether the node is catching up or not
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catchingUp bool
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}
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func NewPeer(conn net.Conn, ethereum *Ethereum, inbound bool) *Peer {
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return &Peer{
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outputQueue: make(chan *ethwire.Msg, outputBufferSize),
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quit: make(chan bool),
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ethereum: ethereum,
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conn: conn,
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inbound: inbound,
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disconnect: 0,
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connected: 1,
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port: 30303,
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}
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}
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func NewOutboundPeer(addr string, ethereum *Ethereum, caps Caps) *Peer {
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data, _ := ethutil.Config.Db.Get([]byte("KeyRing"))
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pubkey := ethutil.NewValueFromBytes(data).Get(2).Bytes()
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p := &Peer{
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outputQueue: make(chan *ethwire.Msg, outputBufferSize),
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quit: make(chan bool),
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ethereum: ethereum,
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inbound: false,
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connected: 0,
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disconnect: 0,
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caps: caps,
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pubkey: pubkey,
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}
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// Set up the connection in another goroutine so we don't block the main thread
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go func() {
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conn, err := net.DialTimeout("tcp", addr, 30*time.Second)
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if err != nil {
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log.Println("Connection to peer failed", err)
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p.Stop()
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return
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}
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p.conn = conn
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// Atomically set the connection state
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atomic.StoreInt32(&p.connected, 1)
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atomic.StoreInt32(&p.disconnect, 0)
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p.Start()
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}()
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return p
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}
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// Outputs any RLP encoded data to the peer
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func (p *Peer) QueueMessage(msg *ethwire.Msg) {
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p.outputQueue <- msg
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}
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func (p *Peer) writeMessage(msg *ethwire.Msg) {
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// Ignore the write if we're not connected
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if atomic.LoadInt32(&p.connected) != 1 {
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return
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}
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if !p.versionKnown {
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switch msg.Type {
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case ethwire.MsgHandshakeTy: // Ok
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default: // Anything but ack is allowed
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return
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}
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}
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err := ethwire.WriteMessage(p.conn, msg)
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if err != nil {
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log.Println("Can't send message:", err)
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// Stop the client if there was an error writing to it
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p.Stop()
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return
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}
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}
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// Outbound message handler. Outbound messages are handled here
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func (p *Peer) HandleOutbound() {
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// 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:
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for {
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select {
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// Main message queue. All outbound messages are processed through here
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case msg := <-p.outputQueue:
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p.writeMessage(msg)
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p.lastSend = time.Now()
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// Ping timer sends a ping to the peer each 2 minutes
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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
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// posting or block posting
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case <-serviceTimer.C:
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if p.caps&CapPeerDiscTy > 0 {
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msg := p.peersMessage()
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p.ethereum.BroadcastMsg(msg)
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}
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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
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}
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}
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clean:
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// This loop is for draining the output queue and anybody waiting for us
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for {
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select {
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case <-p.outputQueue:
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// TODO
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default:
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break clean
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}
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}
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}
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// Inbound handler. Inbound messages are received here and passed to the appropriate methods
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func (p *Peer) HandleInbound() {
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out:
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for atomic.LoadInt32(&p.disconnect) == 0 {
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// HMM?
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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)
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if err != nil {
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log.Println(err)
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break out
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}
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for _, msg := range msgs {
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switch msg.Type {
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case ethwire.MsgHandshakeTy:
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// Version message
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p.handleHandshake(msg)
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if p.caps.IsCap(CapPeerDiscTy) {
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p.QueueMessage(ethwire.NewMessage(ethwire.MsgGetPeersTy, ""))
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}
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case ethwire.MsgDiscTy:
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p.Stop()
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log.Println("Disconnect peer:", DiscReason(msg.Data.Get(0).AsUint()))
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case ethwire.MsgPingTy:
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// Respond back with pong
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p.QueueMessage(ethwire.NewMessage(ethwire.MsgPongTy, ""))
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case ethwire.MsgPongTy:
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// If we received a pong back from a peer we set the
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// last pong so the peer handler knows this peer is still
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// active.
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p.lastPong = time.Now().Unix()
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case ethwire.MsgBlockTy:
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// Get all blocks and process them
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msg.Data = msg.Data
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for i := msg.Data.Length() - 1; i >= 0; i-- {
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// FIXME
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block := ethchain.NewBlockFromRlpValue(ethutil.NewValue(msg.Data.Get(i).AsRaw()))
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err := p.ethereum.BlockManager.ProcessBlock(block)
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if err != nil {
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log.Println(err)
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} else {
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if p.catchingUp && msg.Data.Length() > 1 {
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p.catchingUp = false
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p.CatchupWithPeer()
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}
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}
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}
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case ethwire.MsgTxTy:
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// If the message was a transaction queue the transaction
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// in the TxPool where it will undergo validation and
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// processing when a new block is found
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for i := 0; i < msg.Data.Length(); i++ {
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p.ethereum.TxPool.QueueTransaction(ethchain.NewTransactionFromData(msg.Data.Get(i).Encode()))
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}
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case ethwire.MsgGetPeersTy:
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// Flag this peer as a 'requested of new peers' this to
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// prevent malicious peers being forced.
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p.requestedPeerList = true
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// Peer asked for list of connected peers
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p.pushPeers()
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case ethwire.MsgPeersTy:
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// Received a list of peers (probably because MsgGetPeersTy was send)
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// Only act on message if we actually requested for a peers list
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//if p.requestedPeerList {
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data := msg.Data
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// Create new list of possible peers for the ethereum to process
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peers := make([]string, data.Length())
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// Parse each possible peer
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for i := 0; i < data.Length(); i++ {
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peers[i] = unpackAddr(data.Get(i).Get(0), data.Get(i).Get(1).AsUint())
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}
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// Connect to the list of peers
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p.ethereum.ProcessPeerList(peers)
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// Mark unrequested again
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p.requestedPeerList = false
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//}
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case ethwire.MsgGetChainTy:
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var parent *ethchain.Block
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// Length minus one since the very last element in the array is a count
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l := msg.Data.Length() - 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()
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amountOfBlocks := uint64(100)
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// Check each SHA block hash from the message and determine whether
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// the SHA is in the database
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for i := 0; i < l; i++ {
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if data := msg.Data.Get(i).AsBytes(); p.ethereum.BlockManager.BlockChain().HasBlock(data) {
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parent = p.ethereum.BlockManager.BlockChain().GetBlock(data)
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break
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}
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}
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// If a parent is found send back a reply
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if parent != nil {
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chain := p.ethereum.BlockManager.BlockChain().GetChainFromHash(parent.Hash(), amountOfBlocks)
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p.QueueMessage(ethwire.NewMessage(ethwire.MsgBlockTy, chain))
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} else {
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// If no blocks are found we send back a reply with msg not in chain
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// and the last hash from get chain
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lastHash := msg.Data.Get(l - 1)
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log.Printf("Sending not in chain with hash %x\n", lastHash.AsRaw())
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p.QueueMessage(ethwire.NewMessage(ethwire.MsgNotInChainTy, []interface{}{lastHash.AsRaw()}))
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}
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case ethwire.MsgNotInChainTy:
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log.Printf("Not in chain %x\n", msg.Data)
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// TODO
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// Unofficial but fun nonetheless
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case ethwire.MsgTalkTy:
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log.Printf("%v says: %s\n", p.conn.RemoteAddr(), msg.Data.AsString())
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}
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}
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}
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p.Stop()
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}
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func packAddr(address, port string) ([]interface{}, uint16) {
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addr := strings.Split(address, ".")
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a, _ := strconv.Atoi(addr[0])
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b, _ := strconv.Atoi(addr[1])
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c, _ := strconv.Atoi(addr[2])
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d, _ := strconv.Atoi(addr[3])
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host := []interface{}{byte(a), byte(b), byte(c), byte(d)}
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prt, _ := strconv.Atoi(port)
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return host, uint16(prt)
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}
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func unpackAddr(value *ethutil.RlpValue, p uint64) string {
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a := strconv.Itoa(int(value.Get(0).AsUint()))
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b := strconv.Itoa(int(value.Get(1).AsUint()))
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c := strconv.Itoa(int(value.Get(2).AsUint()))
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d := strconv.Itoa(int(value.Get(3).AsUint()))
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host := strings.Join([]string{a, b, c, d}, ".")
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port := strconv.Itoa(int(p))
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return net.JoinHostPort(host, port)
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}
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func (p *Peer) Start() {
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peerHost, peerPort, _ := net.SplitHostPort(p.conn.LocalAddr().String())
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servHost, servPort, _ := net.SplitHostPort(p.conn.RemoteAddr().String())
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if p.inbound {
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p.host, p.port = packAddr(peerHost, peerPort)
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} else {
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p.host, p.port = packAddr(servHost, servPort)
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}
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err := p.pushHandshake()
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if err != nil {
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log.Printf("Peer can't send outbound version ack", err)
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p.Stop()
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return
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}
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// Run the outbound handler in a new goroutine
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go p.HandleOutbound()
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// Run the inbound handler in a new goroutine
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go p.HandleInbound()
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}
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func (p *Peer) Stop() {
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if atomic.AddInt32(&p.disconnect, 1) != 1 {
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return
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}
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close(p.quit)
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if atomic.LoadInt32(&p.connected) != 0 {
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p.writeMessage(ethwire.NewMessage(ethwire.MsgDiscTy, ""))
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p.conn.Close()
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}
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}
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func (p *Peer) pushHandshake() error {
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msg := ethwire.NewMessage(ethwire.MsgHandshakeTy, []interface{}{
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uint32(3), uint32(0), "/Ethereum(G) v0.0.1/", byte(p.caps), p.port, p.pubkey,
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})
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p.QueueMessage(msg)
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return nil
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}
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func (p *Peer) peersMessage() *ethwire.Msg {
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outPeers := make([]interface{}, len(p.ethereum.InOutPeers()))
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// Serialise each peer
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for i, peer := range p.ethereum.InOutPeers() {
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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
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return ethwire.NewMessage(ethwire.MsgPeersTy, outPeers)
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}
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// Pushes the list of outbound peers to the client when requested
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func (p *Peer) pushPeers() {
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p.QueueMessage(p.peersMessage())
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}
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func (p *Peer) handleHandshake(msg *ethwire.Msg) {
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c := msg.Data
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if c.Get(0).AsUint() != 2 {
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log.Println("Invalid peer version. Require protocol v 2")
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p.Stop()
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return
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}
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// [PROTOCOL_VERSION, NETWORK_ID, CLIENT_ID, CAPS, PORT, PUBKEY]
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p.versionKnown = true
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var istr string
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// If this is an inbound connection send an ack back
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if p.inbound {
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p.pubkey = c.Get(5).AsBytes()
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p.port = uint16(c.Get(4).AsUint())
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// Self connect detection
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data, _ := ethutil.Config.Db.Get([]byte("KeyRing"))
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pubkey := ethutil.NewValueFromBytes(data).Get(2).Bytes()
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if bytes.Compare(pubkey, p.pubkey) == 0 {
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p.Stop()
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return
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}
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istr = "inbound"
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} else {
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p.CatchupWithPeer()
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istr = "outbound"
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}
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p.caps = Caps(c.Get(3).AsByte())
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log.Printf("peer connect (%s) %v %s [%s]\n", istr, p.conn.RemoteAddr(), c.Get(2).AsString(), p.caps)
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}
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func (p *Peer) CatchupWithPeer() {
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if !p.catchingUp {
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p.catchingUp = true
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msg := ethwire.NewMessage(ethwire.MsgGetChainTy, []interface{}{p.ethereum.BlockManager.BlockChain().CurrentBlock.Hash(), uint64(50)})
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p.QueueMessage(msg)
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log.Printf("Requesting blockchain up from %x\n", p.ethereum.BlockManager.BlockChain().CurrentBlock.Hash())
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}
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}
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func (p *Peer) RlpData() []interface{} {
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return []interface{}{p.host, p.port, p.pubkey}
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}
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