Example #1
0
func (d *Diagnostics) getDiagnosticFromPeer(ctx context.Context, p peer.ID, pmes *pb.Message) (<-chan *DiagInfo, error) {
	s, err := d.host.NewStream(ctx, ProtocolDiag, p)
	if err != nil {
		return nil, err
	}

	cr := ctxio.NewReader(ctx, s) // ok to use. we defer close stream in this func
	cw := ctxio.NewWriter(ctx, s) // ok to use. we defer close stream in this func
	r := ggio.NewDelimitedReader(cr, inet.MessageSizeMax)
	w := ggio.NewDelimitedWriter(cw)

	start := time.Now()

	if err := w.WriteMsg(pmes); err != nil {
		return nil, err
	}

	out := make(chan *DiagInfo)
	go func() {

		defer func() {
			close(out)
			s.Close()
			rtt := time.Since(start)
			log.Infof("diagnostic request took: %s", rtt.String())
		}()

		for {
			rpmes := new(pb.Message)
			if err := r.ReadMsg(rpmes); err != nil {
				log.Debugf("Error reading diagnostic from stream: %s", err)
				return
			}
			if rpmes == nil {
				log.Debug("got no response back from diag request")
				return
			}

			di, err := decodeDiagJson(rpmes.GetData())
			if err != nil {
				log.Debug(err)
				return
			}

			select {
			case out <- di:
			case <-ctx.Done():
				return
			}
		}

	}()

	return out, nil
}
Example #2
0
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
}
Example #3
0
func (dht *IpfsDHT) handleNewMessage(s inet.Stream) {
	defer s.Close()

	ctx := dht.Context()
	cr := ctxio.NewReader(ctx, s) // ok to use. we defer close stream in this func
	cw := ctxio.NewWriter(ctx, s) // ok to use. we defer close stream in this func
	r := ggio.NewDelimitedReader(cr, inet.MessageSizeMax)
	w := ggio.NewDelimitedWriter(cw)
	mPeer := s.Conn().RemotePeer()

	for {
		// receive msg
		pmes := new(pb.Message)
		if err := r.ReadMsg(pmes); err != nil {
			log.Debugf("Error unmarshaling data: %s", err)
			return
		}

		// update the peer (on valid msgs only)
		dht.updateFromMessage(ctx, mPeer, pmes)

		// get handler for this msg type.
		handler := dht.handlerForMsgType(pmes.GetType())
		if handler == nil {
			log.Debug("got back nil handler from handlerForMsgType")
			return
		}

		// dispatch handler.
		rpmes, err := handler(ctx, mPeer, pmes)
		if err != nil {
			log.Debugf("handle message error: %s", err)
			return
		}

		// if nil response, return it before serializing
		if rpmes == nil {
			log.Debug("got back nil response from request")
			continue
		}

		// send out response msg
		if err := w.WriteMsg(rpmes); err != nil {
			log.Debugf("send response error: %s", err)
			return
		}
	}
}