mirror of https://github.com/ethereum/go-ethereum
obscuren
11 years ago
commit
2b32f47d2c
@ -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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|
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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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@ -0,0 +1,213 @@ |
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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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|
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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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} |
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} |
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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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|
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close(p.quit) |
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if atomic.LoadInt32(&p.connected) != 0 { |
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p.conn.Close() |
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} |
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|
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log.Println("Peer shutdown") |
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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, ethutil.Encode([]interface{}{ |
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1, 0, p.ethereum.Nonce, |
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})) |
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|
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p.QueueMessage(msg) |
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|
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return nil |
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} |
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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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outPeers := make([]interface{}, len(p.ethereum.OutboundPeers())) |
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// Serialise each peer
|
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for i, peer := range p.ethereum.OutboundPeers() { |
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outPeers[i] = peer.RlpEncode() |
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} |
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|
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// Send message to the peer with the known list of connected clients
|
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msg := ethwire.NewMessage(ethwire.MsgPeersTy, ethutil.Encode(outPeers)) |
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|
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p.QueueMessage(msg) |
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} |
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|
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func (p *Peer) handleHandshake(msg *ethwire.Msg) { |
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c := ethutil.Conv(msg.Data) |
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// [PROTOCOL_VERSION, NETWORK_ID, CLIENT_ID]
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if c.Get(2).AsUint() == p.ethereum.Nonce { |
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//if msg.Nonce == p.ethereum.Nonce {
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log.Println("Peer connected to self, disconnecting") |
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|
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p.Stop() |
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|
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return |
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} |
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|
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p.versionKnown = true |
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|
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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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err := p.pushHandshake() |
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if err != nil { |
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log.Println("Peer can't send ack back") |
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|
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p.Stop() |
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} |
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} |
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} |
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|
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func (p *Peer) RlpEncode() []byte { |
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host, prt, err := net.SplitHostPort(p.conn.RemoteAddr().String()) |
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if err != nil { |
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return nil |
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} |
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|
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i, err := strconv.Atoi(prt) |
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if err != nil { |
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return nil |
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} |
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|
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port := ethutil.NumberToBytes(uint16(i), 16) |
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|
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return ethutil.Encode([]interface{}{host, port}) |
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} |
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Loading…
Reference in new issue