Initial commit bootstrapping package
This commit is contained in:
obscuren
Коммит
2b32f47d2c
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@ -0,0 +1,12 @@
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# See http://help.github.com/ignore-files/ for more about ignoring files.
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#
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# If you find yourself ignoring temporary files generated by your text editor
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# or operating system, you probably want to add a global ignore instead:
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# git config --global core.excludesfile ~/.gitignore_global
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/tmp
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*/**/*un~
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*un~
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.DS_Store
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*/**/.DS_Store
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package eth
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import (
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"container/list"
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"github.com/ethereum/ethchain-go"
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"github.com/ethereum/ethdb-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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"sync/atomic"
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"time"
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)
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func eachPeer(peers *list.List, callback func(*Peer, *list.Element)) {
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// Loop thru the peers and close them (if we had them)
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for e := peers.Front(); e != nil; e = e.Next() {
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if peer, ok := e.Value.(*Peer); ok {
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callback(peer, e)
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}
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}
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}
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const (
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processReapingTimeout = 60 // TODO increase
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)
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type Ethereum struct {
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// Channel for shutting down the ethereum
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shutdownChan chan bool
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// DB interface
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//db *ethdb.LDBDatabase
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db *ethdb.MemDatabase
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// Block manager for processing new blocks and managing the block chain
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BlockManager *ethchain.BlockManager
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// The transaction pool. Transaction can be pushed on this pool
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// for later including in the blocks
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TxPool *ethchain.TxPool
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// Peers (NYI)
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peers *list.List
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// Nonce
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Nonce uint64
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}
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func New() (*Ethereum, error) {
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//db, err := ethdb.NewLDBDatabase()
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db, err := ethdb.NewMemDatabase()
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if err != nil {
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return nil, err
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}
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ethutil.Config.Db = db
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nonce, _ := ethutil.RandomUint64()
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ethereum := &Ethereum{
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shutdownChan: make(chan bool),
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db: db,
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peers: list.New(),
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Nonce: nonce,
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}
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ethereum.TxPool = ethchain.NewTxPool()
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ethereum.TxPool.Speaker = ethereum
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ethereum.BlockManager = ethchain.NewBlockManager()
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ethereum.TxPool.BlockManager = ethereum.BlockManager
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ethereum.BlockManager.TransactionPool = ethereum.TxPool
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return ethereum, nil
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}
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func (s *Ethereum) AddPeer(conn net.Conn) {
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peer := NewPeer(conn, s, true)
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if peer != nil {
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s.peers.PushBack(peer)
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peer.Start()
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log.Println("Peer connected ::", conn.RemoteAddr())
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}
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}
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func (s *Ethereum) ProcessPeerList(addrs []string) {
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for _, addr := range addrs {
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// TODO Probably requires some sanity checks
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s.ConnectToPeer(addr)
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}
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}
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func (s *Ethereum) ConnectToPeer(addr string) error {
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peer := NewOutboundPeer(addr, s)
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s.peers.PushBack(peer)
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return nil
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}
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func (s *Ethereum) OutboundPeers() []*Peer {
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// Create a new peer slice with at least the length of the total peers
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outboundPeers := make([]*Peer, s.peers.Len())
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length := 0
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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if !p.inbound {
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outboundPeers[length] = p
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length++
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}
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})
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return outboundPeers[:length]
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}
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func (s *Ethereum) InboundPeers() []*Peer {
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// Create a new peer slice with at least the length of the total peers
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inboundPeers := make([]*Peer, s.peers.Len())
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length := 0
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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if p.inbound {
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inboundPeers[length] = p
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length++
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}
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})
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return inboundPeers[:length]
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}
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func (s *Ethereum) Broadcast(msgType ethwire.MsgType, data []byte) {
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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p.QueueMessage(ethwire.NewMessage(msgType, data))
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})
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}
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func (s *Ethereum) ReapDeadPeers() {
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for {
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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if atomic.LoadInt32(&p.disconnect) == 1 || (p.inbound && (time.Now().Unix()-p.lastPong) > int64(5*time.Minute)) {
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log.Println("Dead peer found .. reaping")
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s.peers.Remove(e)
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}
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})
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time.Sleep(processReapingTimeout * time.Second)
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}
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}
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// Start the ethereum
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func (s *Ethereum) Start() {
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// For now this function just blocks the main thread
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ln, err := net.Listen("tcp", ":12345")
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if err != nil {
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// This is mainly for testing to create a "network"
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if ethutil.Config.Debug {
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log.Println("Connection listening disabled. Acting as client")
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err = s.ConnectToPeer("localhost:12345")
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if err != nil {
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log.Println("Error starting ethereum", err)
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s.Stop()
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}
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} else {
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log.Fatal(err)
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}
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} else {
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// Starting accepting connections
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go func() {
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for {
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conn, err := ln.Accept()
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if err != nil {
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log.Println(err)
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continue
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}
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go s.AddPeer(conn)
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}
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}()
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}
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// Start the reaping processes
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go s.ReapDeadPeers()
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// Start the tx pool
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s.TxPool.Start()
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// TMP
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/*
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go func() {
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for {
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s.Broadcast("block", s.blockManager.bc.GenesisBlock().RlpEncode())
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time.Sleep(1000 * time.Millisecond)
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}
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}()
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*/
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}
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func (s *Ethereum) Stop() {
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// Close the database
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defer s.db.Close()
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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p.Stop()
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})
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s.shutdownChan <- true
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s.TxPool.Stop()
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}
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// This function will wait for a shutdown and resumes main thread execution
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func (s *Ethereum) WaitForShutdown() {
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<-s.shutdownChan
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}
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@ -0,0 +1,303 @@
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package eth
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import (
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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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"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 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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}
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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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}
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}
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func NewOutboundPeer(addr string, ethereum *Ethereum) *Peer {
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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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}
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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.Dial("tcp", addr)
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if err != nil {
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p.Stop()
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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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log.Println("Connected to peer ::", conn.RemoteAddr())
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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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tickleTimer := time.NewTicker(2 * 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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case <-tickleTimer.C:
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p.writeMessage(ðwire.Msg{Type: ethwire.MsgPingTy})
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// Break out of the for loop if a quit message is posted
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case <-p.quit:
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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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// Wait for a message from the peer
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msg, err := ethwire.ReadMessage(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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if ethutil.Config.Debug {
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log.Printf("Received %s\n", msg.Type.String())
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}
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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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case ethwire.MsgBlockTy:
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err := p.ethereum.BlockManager.ProcessBlock(ethutil.NewBlock(msg.Data))
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if err != nil {
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log.Println(err)
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}
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case ethwire.MsgTxTy:
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p.ethereum.TxPool.QueueTransaction(ethutil.NewTransactionFromData(msg.Data))
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case ethwire.MsgInvTy:
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case ethwire.MsgGetPeersTy:
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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 := ethutil.Conv(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] = data.Get(i).AsString() + strconv.Itoa(int(data.Get(i).AsUint()))
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}
|
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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.MsgPingTy:
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// Respond back with pong
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p.QueueMessage(ðwire.Msg{Type: ethwire.MsgPongTy})
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case ethwire.MsgPongTy:
|
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p.lastPong = time.Now().Unix()
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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 (p *Peer) Start() {
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if !p.inbound {
|
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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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// Run the outbound handler in a new goroutine
|
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go p.HandleOutbound()
|
||||
// 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
|
||||
}
|
||||
|
||||
close(p.quit)
|
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if atomic.LoadInt32(&p.connected) != 0 {
|
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p.conn.Close()
|
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}
|
||||
|
||||
log.Println("Peer shutdown")
|
||||
}
|
||||
|
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func (p *Peer) pushHandshake() error {
|
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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})
|
||||
}
|
||||
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