2014-01-23 11:14:01 -08:00
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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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2014-01-24 08:48:21 -08:00
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ethereum.BlockManager = ethchain.NewBlockManager(ethereum)
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2014-01-23 11:14:01 -08:00
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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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2014-01-30 15:56:32 -08:00
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if s.peers.Len() > 25 {
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2014-01-30 14:48:52 -08:00
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log.Println("SEED")
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peer.Start(true)
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} else {
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s.peers.PushBack(peer)
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peer.Start(false)
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}
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2014-01-23 11:14:01 -08:00
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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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2014-01-30 16:12:48 -08:00
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var alreadyConnected bool
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eachPeer(s.peers, func(p *Peer, v *list.Element) {
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phost, _, _ := net.SplitHostPort(p.conn.RemoteAddr().String())
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ahost, _, _ := net.SplitHostPort(addr)
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if phost == ahost {
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alreadyConnected = true
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return
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}
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})
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if alreadyConnected {
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return nil
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}
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2014-01-23 11:14:01 -08:00
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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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2014-01-23 13:32:50 -08:00
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func (s *Ethereum) Broadcast(msgType ethwire.MsgType, data interface{}) {
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msg := ethwire.NewMessage(msgType, data)
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2014-01-23 11:14:01 -08:00
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eachPeer(s.peers, func(p *Peer, e *list.Element) {
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2014-01-23 13:32:50 -08:00
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p.QueueMessage(msg)
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2014-01-23 11:14:01 -08:00
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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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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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2014-01-27 13:13:46 -08:00
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// Bind to addr and port
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ln, err := net.Listen("tcp", ":30303")
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2014-01-23 11:14:01 -08:00
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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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2014-01-27 06:34:50 -08:00
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/*
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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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2014-01-23 11:14:01 -08:00
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2014-01-27 06:34:50 -08:00
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s.Stop()
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}
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*/
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2014-01-23 11:14:01 -08:00
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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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2014-01-30 14:48:52 -08:00
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log.Println("Ready and accepting connections")
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2014-01-23 11:14:01 -08:00
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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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}
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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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