package network import ( "net" "regexp" "time" "github.com/CityOfZion/neo-go/pkg/io" log "github.com/sirupsen/logrus" ) // TCPTransport allows network communication over TCP. type TCPTransport struct { server *Server listener net.Listener bindAddr string } var reClosedNetwork = regexp.MustCompile(".* use of closed network connection") // NewTCPTransport returns a new TCPTransport that will listen for // new incoming peer connections. func NewTCPTransport(s *Server, bindAddr string) *TCPTransport { return &TCPTransport{ server: s, bindAddr: bindAddr, } } // Dial implements the Transporter interface. func (t *TCPTransport) Dial(addr string, timeout time.Duration) error { conn, err := net.DialTimeout("tcp", addr, timeout) if err != nil { return err } go t.handleConn(conn) return nil } // Accept implements the Transporter interface. func (t *TCPTransport) Accept() { l, err := net.Listen("tcp", t.bindAddr) if err != nil { log.Fatalf("TCP listen error %s", err) return } t.listener = l for { conn, err := l.Accept() if err != nil { log.Warnf("TCP accept error: %s", err) if t.isCloseError(err) { break } continue } go t.handleConn(conn) } } func (t *TCPTransport) isCloseError(err error) bool { if opErr, ok := err.(*net.OpError); ok { if reClosedNetwork.Match([]byte(opErr.Error())) { return true } } return false } func (t *TCPTransport) handleConn(conn net.Conn) { var ( p = NewTCPPeer(conn) err error ) t.server.register <- p // When a new peer is connected we send out our version immediately. if err := t.server.sendVersion(p); err != nil { log.WithFields(log.Fields{ "addr": p.RemoteAddr(), }).Error(err) } r := io.NewBinReaderFromIO(p.conn) for { msg := &Message{} if err = msg.Decode(r); err != nil { break } if err = t.server.handleMessage(p, msg); err != nil { break } } t.server.unregister <- peerDrop{p, err} p.Disconnect(err) } // Close implements the Transporter interface. func (t *TCPTransport) Close() { t.listener.Close() } // Proto implements the Transporter interface. func (t *TCPTransport) Proto() string { return "tcp" }