Golang go-libp2p-net.Stream类代码示例

func (d *Diagnostics) HandleMessage(ctx context.Context, s inet.Stream) error {

	cr := ctxio.NewReader(ctx, s)
	cw := ctxio.NewWriter(ctx, s)
	r := ggio.NewDelimitedReader(cr, inet.MessageSizeMax) // maxsize
	w := ggio.NewDelimitedWriter(cw)

	// deserialize msg
	pmes := new(pb.Message)
	if err := r.ReadMsg(pmes); err != nil {
		log.Debugf("Failed to decode protobuf message: %v", err)
		return nil
	}

	// Print out diagnostic
	log.Infof("[peer: %s] Got message from [%s]\n",
		d.self.Pretty(), s.Conn().RemotePeer())

	// Make sure we havent already handled this request to prevent loops
	if err := d.startDiag(pmes.GetDiagID()); err != nil {
		return nil
	}

	resp := newMessage(pmes.GetDiagID())
	resp.Data = d.getDiagInfo().Marshal()
	if err := w.WriteMsg(resp); err != nil {
		log.Debugf("Failed to write protobuf message over stream: %s", err)
		return err
	}

	timeout := pmes.GetTimeoutDuration()
	if timeout < HopTimeoutDecrement {
		return fmt.Errorf("timeout too short: %s", timeout)
	}
	ctx, cancel := context.WithTimeout(ctx, timeout)
	defer cancel()
	pmes.SetTimeoutDuration(timeout - HopTimeoutDecrement)

	dpeers, err := d.getDiagnosticFromPeers(ctx, d.getPeers(), pmes)
	if err != nil {
		log.Debugf("diagnostic from peers err: %s", err)
		return err
	}
	for b := range dpeers {
		resp := newMessage(pmes.GetDiagID())
		resp.Data = b.Marshal()
		if err := w.WriteMsg(resp); err != nil {
			log.Debugf("Failed to write protobuf message over stream: %s", err)
			return err
		}
	}

	return nil
}

func msgToStream(ctx context.Context, s inet.Stream, msg bsmsg.BitSwapMessage) error {
	deadline := time.Now().Add(sendMessageTimeout)
	if dl, ok := ctx.Deadline(); ok {
		deadline = dl
	}

	if err := s.SetWriteDeadline(deadline); err != nil {
		log.Warningf("error setting deadline: %s", err)
	}

	switch s.Protocol() {
	case ProtocolBitswap:
		if err := msg.ToNetV1(s); err != nil {
			log.Debugf("error: %s", err)
			return err
		}
	case ProtocolBitswapOne, ProtocolBitswapNoVers:
		if err := msg.ToNetV0(s); err != nil {
			log.Debugf("error: %s", err)
			return err
		}
	default:
		return fmt.Errorf("unrecognized protocol on remote: %s", s.Protocol())
	}

	if err := s.SetWriteDeadline(time.Time{}); err != nil {
		log.Warningf("error resetting deadline: %s", err)
	}
	return nil
}

func (lb *Loopback) HandleStream(s inet.Stream) {
	defer s.Close()
	pbr := ggio.NewDelimitedReader(s, inet.MessageSizeMax)
	var incoming dhtpb.Message
	if err := pbr.ReadMsg(&incoming); err != nil {
		log.Debug(err)
		return
	}
	ctx := context.TODO()
	outgoing := lb.Handler.HandleRequest(ctx, s.Conn().RemotePeer(), &incoming)

	pbw := ggio.NewDelimitedWriter(s)

	if err := pbw.WriteMsg(outgoing); err != nil {
		return // TODO logerr
	}
}

func msgToStream(s inet.Stream, msg bsmsg.BitSwapMessage) error {
	switch s.Protocol() {
	case ProtocolBitswap:
		if err := msg.ToNetV1(s); err != nil {
			log.Debugf("error: %s", err)
			return err
		}
	case ProtocolBitswapOne, ProtocolBitswapNoVers:
		if err := msg.ToNetV0(s); err != nil {
			log.Debugf("error: %s", err)
			return err
		}
	default:
		return fmt.Errorf("unrecognized protocol on remote: %s", s.Protocol())
	}
	return nil
}

func doAccept(app *cnAppInfo, remote net.Stream, listener manet.Listener) {
	local, err := listener.Accept()
	if err != nil {
		return
	}
	defer listener.Close()

	stream := cnStreamInfo{
		protocol: app.protocol,

		localPeer: app.identity,
		localAddr: app.address,

		remotePeer: remote.Conn().RemotePeer(),
		remoteAddr: remote.Conn().RemoteMultiaddr(),

		local:  local,
		remote: remote,
	}

	streams.Register(&stream)
	startStreaming(&stream)
}

// handleNewStream receives a new stream from the network.
func (bsnet *impl) handleNewStream(s inet.Stream) {
	defer s.Close()

	if bsnet.receiver == nil {
		return
	}

	reader := ggio.NewDelimitedReader(s, inet.MessageSizeMax)
	for {
		received, err := bsmsg.FromPBReader(reader)
		if err != nil {
			if err != io.EOF {
				go bsnet.receiver.ReceiveError(err)
				log.Debugf("bitswap net handleNewStream from %s error: %s", s.Conn().RemotePeer(), err)
			}
			return
		}

		p := s.Conn().RemotePeer()
		ctx := context.Background()
		log.Debugf("bitswap net handleNewStream from %s", s.Conn().RemotePeer())
		bsnet.receiver.ReceiveMessage(ctx, p, received)
	}
}

func (d *Diagnostics) handleNewStream(s inet.Stream) {
	d.HandleMessage(context.Background(), s)
	s.Close()
}

func (p *standard) HandleStream(s inet.Stream) {
	// TODO(brian): Should clients be able to satisfy requests?
	log.Error("supernode client received (dropped) a routing message from", s.Conn().RemotePeer())
	s.Close()
}