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author | obscuren <geffobscura@gmail.com> | 2014-01-24 03:16:52 +0800 |
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committer | obscuren <geffobscura@gmail.com> | 2014-01-24 03:16:52 +0800 |
commit | 477e8a7a73820ece05bbb990607a1919d3788960 (patch) | |
tree | c13d1d7f709f0934b54ef10377e671446d165db7 /peer.go | |
parent | 3616080db46931202003157bacf10748008bebc0 (diff) | |
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Rearrange packages
Diffstat (limited to 'peer.go')
-rw-r--r-- | peer.go | 303 |
1 files changed, 0 insertions, 303 deletions
diff --git a/peer.go b/peer.go deleted file mode 100644 index 207f9e59f..000000000 --- a/peer.go +++ /dev/null @@ -1,303 +0,0 @@ -package main - -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 { - // Server interface - server *Server - // 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, server *Server, inbound bool) *Peer { - return &Peer{ - outputQueue: make(chan *ethwire.Msg, outputBufferSize), - quit: make(chan bool), - server: server, - conn: conn, - inbound: inbound, - disconnect: 0, - connected: 1, - } -} - -func NewOutboundPeer(addr string, server *Server) *Peer { - p := &Peer{ - outputQueue: make(chan *ethwire.Msg, outputBufferSize), - quit: make(chan bool), - server: server, - 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(ðwire.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 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.server.blockManager.ProcessBlock(ethutil.NewBlock(msg.Data)) - if err != nil { - log.Println(err) - } - case ethwire.MsgTxTy: - p.server.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 server 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.server.ProcessPeerList(peers) - // Mark unrequested again - p.requestedPeerList = false - } - case ethwire.MsgPingTy: - // Respond back with pong - p.QueueMessage(ðwire.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.server.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.server.OutboundPeers())) - // Serialise each peer - for i, peer := range p.server.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.server.Nonce { - //if msg.Nonce == p.server.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}) -} |