cerc-io/plugeth
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Initial commit bootstrapping package

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obscuren 2014-01-23 20:14:01 +01:00
commit 2b32f47d2c
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12
.gitignore vendored Normal file
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#
# If you find yourself ignoring temporary files generated by your text editor
# or operating system, you probably want to add a global ignore instead:
# git config --global core.excludesfile ~/.gitignore_global
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213
ethereum.go Normal file
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package eth
import (
"container/list"
"github.com/ethereum/ethchain-go"
"github.com/ethereum/ethdb-go"
"github.com/ethereum/ethutil-go"
"github.com/ethereum/ethwire-go"
"log"
"net"
"sync/atomic"
"time"
)
func eachPeer(peers *list.List, callback func(*Peer, *list.Element)) {
// Loop thru the peers and close them (if we had them)
for e := peers.Front(); e != nil; e = e.Next() {
if peer, ok := e.Value.(*Peer); ok {
callback(peer, e)
}
}
}
const (
processReapingTimeout = 60 // TODO increase
)
type Ethereum struct {
// Channel for shutting down the ethereum
shutdownChan chan bool
// DB interface
//db *ethdb.LDBDatabase
db *ethdb.MemDatabase
// Block manager for processing new blocks and managing the block chain
BlockManager *ethchain.BlockManager
// The transaction pool. Transaction can be pushed on this pool
// for later including in the blocks
TxPool *ethchain.TxPool
// Peers (NYI)
peers *list.List
// Nonce
Nonce uint64
}
func New() (*Ethereum, error) {
//db, err := ethdb.NewLDBDatabase()
db, err := ethdb.NewMemDatabase()
if err != nil {
return nil, err
}
ethutil.Config.Db = db
nonce, _ := ethutil.RandomUint64()
ethereum := &Ethereum{
shutdownChan: make(chan bool),
db: db,
peers: list.New(),
Nonce: nonce,
}
ethereum.TxPool = ethchain.NewTxPool()
ethereum.TxPool.Speaker = ethereum
ethereum.BlockManager = ethchain.NewBlockManager()
ethereum.TxPool.BlockManager = ethereum.BlockManager
ethereum.BlockManager.TransactionPool = ethereum.TxPool
return ethereum, nil
}
func (s *Ethereum) AddPeer(conn net.Conn) {
peer := NewPeer(conn, s, true)
if peer != nil {
s.peers.PushBack(peer)
peer.Start()
log.Println("Peer connected ::", conn.RemoteAddr())
}
}
func (s *Ethereum) ProcessPeerList(addrs []string) {
for _, addr := range addrs {
// TODO Probably requires some sanity checks
s.ConnectToPeer(addr)
}
}
func (s *Ethereum) ConnectToPeer(addr string) error {
peer := NewOutboundPeer(addr, s)
s.peers.PushBack(peer)
return nil
}
func (s *Ethereum) OutboundPeers() []*Peer {
// Create a new peer slice with at least the length of the total peers
outboundPeers := make([]*Peer, s.peers.Len())
length := 0
eachPeer(s.peers, func(p *Peer, e *list.Element) {
if !p.inbound {
outboundPeers[length] = p
length++
}
})
return outboundPeers[:length]
}
func (s *Ethereum) InboundPeers() []*Peer {
// Create a new peer slice with at least the length of the total peers
inboundPeers := make([]*Peer, s.peers.Len())
length := 0
eachPeer(s.peers, func(p *Peer, e *list.Element) {
if p.inbound {
inboundPeers[length] = p
length++
}
})
return inboundPeers[:length]
}
func (s *Ethereum) Broadcast(msgType ethwire.MsgType, data []byte) {
eachPeer(s.peers, func(p *Peer, e *list.Element) {
p.QueueMessage(ethwire.NewMessage(msgType, data))
})
}
func (s *Ethereum) ReapDeadPeers() {
for {
eachPeer(s.peers, func(p *Peer, e *list.Element) {
if atomic.LoadInt32(&p.disconnect) == 1 || (p.inbound && (time.Now().Unix()-p.lastPong) > int64(5*time.Minute)) {
log.Println("Dead peer found .. reaping")
s.peers.Remove(e)
}
})
time.Sleep(processReapingTimeout * time.Second)
}
}
// Start the ethereum
func (s *Ethereum) Start() {
// For now this function just blocks the main thread
ln, err := net.Listen("tcp", ":12345")
if err != nil {
// This is mainly for testing to create a "network"
if ethutil.Config.Debug {
log.Println("Connection listening disabled. Acting as client")
err = s.ConnectToPeer("localhost:12345")
if err != nil {
log.Println("Error starting ethereum", err)
s.Stop()
}
} else {
log.Fatal(err)
}
} else {
// Starting accepting connections
go func() {
for {
conn, err := ln.Accept()
if err != nil {
log.Println(err)
continue
}
go s.AddPeer(conn)
}
}()
}
// Start the reaping processes
go s.ReapDeadPeers()
// Start the tx pool
s.TxPool.Start()
// TMP
/*
go func() {
for {
s.Broadcast("block", s.blockManager.bc.GenesisBlock().RlpEncode())
time.Sleep(1000 * time.Millisecond)
}
}()
*/
}
func (s *Ethereum) Stop() {
// Close the database
defer s.db.Close()
eachPeer(s.peers, func(p *Peer, e *list.Element) {
p.Stop()
})
s.shutdownChan <- true
s.TxPool.Stop()
}
// This function will wait for a shutdown and resumes main thread execution
func (s *Ethereum) WaitForShutdown() {
<-s.shutdownChan
}

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peer.go Normal file
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package eth
import (
"github.com/ethereum/ethutil-go"
"github.com/ethereum/ethwire-go"
"log"
"net"
"strconv"
"sync/atomic"
"time"
)
const (
// The size of the output buffer for writing messages
outputBufferSize = 50
)
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
}
func NewPeer(conn net.Conn, ethereum *Ethereum, inbound bool) *Peer {
return &Peer{
outputQueue: make(chan *ethwire.Msg, outputBufferSize),
quit: make(chan bool),
ethereum: ethereum,
conn: conn,
inbound: inbound,
disconnect: 0,
connected: 1,
}
}
func NewOutboundPeer(addr string, ethereum *Ethereum) *Peer {
p := &Peer{
outputQueue: make(chan *ethwire.Msg, outputBufferSize),
quit: make(chan bool),
ethereum: ethereum,
inbound: false,
connected: 0,
disconnect: 0,
}
// Set up the connection in another goroutine so we don't block the main thread
go func() {
conn, err := net.Dial("tcp", addr)
if err != nil {
p.Stop()
}
p.conn = conn
// Atomically set the connection state
atomic.StoreInt32(&p.connected, 1)
atomic.StoreInt32(&p.disconnect, 0)
log.Println("Connected to peer ::", conn.RemoteAddr())
p.Start()
}()
return p
}
// Outputs any RLP encoded data to the peer
func (p *Peer) QueueMessage(msg *ethwire.Msg) {
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 {
log.Println("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
tickleTimer := time.NewTicker(2 * 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()
case <-tickleTimer.C:
p.writeMessage(&ethwire.Msg{Type: ethwire.MsgPingTy})
// Break out of the for loop if a quit message is posted
case <-p.quit:
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() {
out:
for atomic.LoadInt32(&p.disconnect) == 0 {
// Wait for a message from the peer
msg, err := ethwire.ReadMessage(p.conn)
if err != nil {
log.Println(err)
break out
}
if ethutil.Config.Debug {
log.Printf("Received %s\n", msg.Type.String())
}
switch msg.Type {
case ethwire.MsgHandshakeTy:
// Version message
p.handleHandshake(msg)
case ethwire.MsgBlockTy:
err := p.ethereum.BlockManager.ProcessBlock(ethutil.NewBlock(msg.Data))
if err != nil {
log.Println(err)
}
case ethwire.MsgTxTy:
p.ethereum.TxPool.QueueTransaction(ethutil.NewTransactionFromData(msg.Data))
case ethwire.MsgInvTy:
case ethwire.MsgGetPeersTy:
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 := ethutil.Conv(msg.Data)
// Create new list of possible peers for the ethereum to process
peers := make([]string, data.Length())
// Parse each possible peer
for i := 0; i < data.Length(); i++ {
peers[i] = data.Get(i).AsString() + strconv.Itoa(int(data.Get(i).AsUint()))
}
// Connect to the list of peers
p.ethereum.ProcessPeerList(peers)
// Mark unrequested again
p.requestedPeerList = false
}
case ethwire.MsgPingTy:
// Respond back with pong
p.QueueMessage(&ethwire.Msg{Type: ethwire.MsgPongTy})
case ethwire.MsgPongTy:
p.lastPong = time.Now().Unix()
}
}
p.Stop()
}
func (p *Peer) Start() {
if !p.inbound {
err := p.pushHandshake()
if err != nil {
log.Printf("Peer can't send outbound version ack", err)
p.Stop()
}
}
// Run the outbound handler in a new goroutine
go p.HandleOutbound()
// Run the inbound handler in a new goroutine
go p.HandleInbound()
}
func (p *Peer) Stop() {
if atomic.AddInt32(&p.disconnect, 1) != 1 {
return
}
close(p.quit)
if atomic.LoadInt32(&p.connected) != 0 {
p.conn.Close()
}
log.Println("Peer shutdown")
}
func (p *Peer) pushHandshake() error {
msg := ethwire.NewMessage(ethwire.MsgHandshakeTy, ethutil.Encode([]interface{}{
1, 0, p.ethereum.Nonce,
}))
p.QueueMessage(msg)
return nil
}
// Pushes the list of outbound peers to the client when requested
func (p *Peer) pushPeers() {
outPeers := make([]interface{}, len(p.ethereum.OutboundPeers()))
// Serialise each peer
for i, peer := range p.ethereum.OutboundPeers() {
outPeers[i] = peer.RlpEncode()
}
// Send message to the peer with the known list of connected clients
msg := ethwire.NewMessage(ethwire.MsgPeersTy, ethutil.Encode(outPeers))
p.QueueMessage(msg)
}
func (p *Peer) handleHandshake(msg *ethwire.Msg) {
c := ethutil.Conv(msg.Data)
// [PROTOCOL_VERSION, NETWORK_ID, CLIENT_ID]
if c.Get(2).AsUint() == p.ethereum.Nonce {
//if msg.Nonce == p.ethereum.Nonce {
log.Println("Peer connected to self, disconnecting")
p.Stop()
return
}
p.versionKnown = true
// If this is an inbound connection send an ack back
if p.inbound {
err := p.pushHandshake()
if err != nil {
log.Println("Peer can't send ack back")
p.Stop()
}
}
}
func (p *Peer) RlpEncode() []byte {
host, prt, err := net.SplitHostPort(p.conn.RemoteAddr().String())
if err != nil {
return nil
}
i, err := strconv.Atoi(prt)
if err != nil {
return nil
}
port := ethutil.NumberToBytes(uint16(i), 16)
return ethutil.Encode([]interface{}{host, port})
}