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) 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 { if s.peers.Len() > 25 { log.Println("SEED") peer.Start(true) } else { s.peers.PushBack(peer) peer.Start(false) } } } 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 { var alreadyConnected bool eachPeer(s.peers, func(p *Peer, v *list.Element) { if p.conn == nil { return } phost, _, _ := net.SplitHostPort(p.conn.RemoteAddr().String()) ahost, _, _ := net.SplitHostPort(addr) if phost == ahost { alreadyConnected = true return } }) if alreadyConnected { return nil } 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 && p.conn != nil { 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 interface{}) { msg := ethwire.NewMessage(msgType, data) eachPeer(s.peers, func(p *Peer, e *list.Element) { p.QueueMessage(msg) }) } 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)) { s.peers.Remove(e) } }) time.Sleep(processReapingTimeout * time.Second) } } // Start the ethereum func (s *Ethereum) Start() { // Bind to addr and port ln, err := net.Listen("tcp", ":30303") 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() { log.Println("Ready and accepting connections") 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() } 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 }