Golang ca.RemoteNode函數代碼示例

// Leave asks to a member of the raft to remove
// us from the raft cluster. This method is called
// from a member who is willing to leave its raft
// membership to an active member of the raft
func (n *Node) Leave(ctx context.Context, req *api.LeaveRequest) (*api.LeaveResponse, error) {
	nodeInfo, err := ca.RemoteNode(ctx)
	if err != nil {
		return nil, err
	}

	fields := logrus.Fields{
		"node.id": nodeInfo.NodeID,
		"method":  "(*Node).Leave",
	}
	if nodeInfo.ForwardedBy != nil {
		fields["forwarder.id"] = nodeInfo.ForwardedBy.NodeID
	}
	log.G(ctx).WithFields(fields).Debugf("")

	// can't stop the raft node while an async RPC is in progress
	n.stopMu.RLock()
	defer n.stopMu.RUnlock()

	if !n.IsMember() {
		return nil, ErrNoRaftMember
	}

	if !n.isLeader() {
		return nil, ErrLostLeadership
	}

	err = n.RemoveMember(ctx, req.Node.RaftID)
	if err != nil {
		return nil, err
	}

	return &api.LeaveResponse{}, nil
}

// ResolveAddress returns the address reaching for a given node ID.
func (n *Node) ResolveAddress(ctx context.Context, msg *api.ResolveAddressRequest) (*api.ResolveAddressResponse, error) {
	if !n.IsMember() {
		return nil, ErrNoRaftMember
	}

	nodeInfo, err := ca.RemoteNode(ctx)
	if err != nil {
		return nil, err
	}

	fields := logrus.Fields{
		"node.id": nodeInfo.NodeID,
		"method":  "(*Node).ResolveAddress",
		"raft_id": fmt.Sprintf("%x", n.Config.ID),
	}
	if nodeInfo.ForwardedBy != nil {
		fields["forwarder.id"] = nodeInfo.ForwardedBy.NodeID
	}
	log.G(ctx).WithFields(fields).Debug("")

	member := n.cluster.GetMember(msg.RaftID)
	if member == nil {
		return nil, grpc.Errorf(codes.NotFound, "member %x not found", msg.RaftID)
	}
	return &api.ResolveAddressResponse{Addr: member.Addr}, nil
}

// Leave asks to a member of the raft to remove
// us from the raft cluster. This method is called
// from a member who is willing to leave its raft
// membership to an active member of the raft
func (n *Node) Leave(ctx context.Context, req *api.LeaveRequest) (*api.LeaveResponse, error) {
	nodeInfo, err := ca.RemoteNode(ctx)
	if err != nil {
		return nil, err
	}

	ctx, cancel := n.WithContext(ctx)
	defer cancel()

	fields := logrus.Fields{
		"node.id": nodeInfo.NodeID,
		"method":  "(*Node).Leave",
		"raft_id": fmt.Sprintf("%x", n.Config.ID),
	}
	if nodeInfo.ForwardedBy != nil {
		fields["forwarder.id"] = nodeInfo.ForwardedBy.NodeID
	}
	log.G(ctx).WithFields(fields).Debug("")

	if err := n.removeMember(ctx, req.Node.RaftID); err != nil {
		return nil, err
	}

	return &api.LeaveResponse{}, nil
}

// DetachNetwork allows the node to request the release of
// the resources associated to the network attachment.
// - Returns `InvalidArgument` if attachment ID is not provided.
// - Returns `NotFound` if the attachment is not found.
// - Returns an error if the deletion fails.
func (ra *ResourceAllocator) DetachNetwork(ctx context.Context, request *api.DetachNetworkRequest) (*api.DetachNetworkResponse, error) {
	if request.AttachmentID == "" {
		return nil, grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
	}

	nodeInfo, err := ca.RemoteNode(ctx)
	if err != nil {
		return nil, err
	}

	if err := ra.store.Update(func(tx store.Tx) error {
		t := store.GetTask(tx, request.AttachmentID)
		if t == nil {
			return grpc.Errorf(codes.NotFound, "attachment %s not found", request.AttachmentID)
		}
		if t.NodeID != nodeInfo.NodeID {
			return grpc.Errorf(codes.PermissionDenied, "attachment %s doesn't belong to this node", request.AttachmentID)
		}

		return store.DeleteTask(tx, request.AttachmentID)
	}); err != nil {
		return nil, err
	}

	return &api.DetachNetworkResponse{}, nil
}

// PublishLogs publishes log messages for a given subscription
func (lb *LogBroker) PublishLogs(stream api.LogBroker_PublishLogsServer) error {
	remote, err := ca.RemoteNode(stream.Context())
	if err != nil {
		return err
	}

	for {
		log, err := stream.Recv()
		if err == io.EOF {
			return stream.SendAndClose(&api.PublishLogsResponse{})
		}
		if err != nil {
			return err
		}

		if log.SubscriptionID == "" {
			return grpc.Errorf(codes.InvalidArgument, "missing subscription ID")
		}

		// Make sure logs are emitted using the right Node ID to avoid impersonation.
		for _, msg := range log.Messages {
			if msg.Context.NodeID != remote.NodeID {
				return grpc.Errorf(codes.PermissionDenied, "invalid NodeID: expected=%s;received=%s", remote.NodeID, msg.Context.NodeID)
			}
		}

		lb.publish(log)
	}
}

// Heartbeat is heartbeat method for nodes. It returns new TTL in response.
// Node should send new heartbeat earlier than now + TTL, otherwise it will
// be deregistered from dispatcher and its status will be updated to NodeStatus_DOWN
func (d *Dispatcher) Heartbeat(ctx context.Context, r *api.HeartbeatRequest) (*api.HeartbeatResponse, error) {
	nodeInfo, err := ca.RemoteNode(ctx)
	if err != nil {
		return nil, err
	}

	period, err := d.nodes.Heartbeat(nodeInfo.NodeID, r.SessionID)
	return &api.HeartbeatResponse{Period: *ptypes.DurationProto(period)}, err
}

// AttachNetwork allows the node to request the resources
// allocation needed for a network attachment on the specific node.
// - Returns `InvalidArgument` if the Spec is malformed.
// - Returns `NotFound` if the Network is not found.
// - Returns `PermissionDenied` if the Network is not manually attachable.
// - Returns an error if the creation fails.
func (ra *ResourceAllocator) AttachNetwork(ctx context.Context, request *api.AttachNetworkRequest) (*api.AttachNetworkResponse, error) {
	nodeInfo, err := ca.RemoteNode(ctx)
	if err != nil {
		return nil, err
	}

	var network *api.Network
	ra.store.View(func(tx store.ReadTx) {
		network = store.GetNetwork(tx, request.Config.Target)
		if network == nil {
			if networks, err := store.FindNetworks(tx, store.ByName(request.Config.Target)); err == nil && len(networks) == 1 {
				network = networks[0]
			}
		}
	})
	if network == nil {
		return nil, grpc.Errorf(codes.NotFound, "network %s not found", request.Config.Target)
	}

	if !network.Spec.Attachable {
		return nil, grpc.Errorf(codes.PermissionDenied, "network %s not manually attachable", request.Config.Target)
	}

	t := &api.Task{
		ID:     identity.NewID(),
		NodeID: nodeInfo.NodeID,
		Spec: api.TaskSpec{
			Runtime: &api.TaskSpec_Attachment{
				Attachment: &api.NetworkAttachmentSpec{
					ContainerID: request.ContainerID,
				},
			},
			Networks: []*api.NetworkAttachmentConfig{
				{
					Target:    network.ID,
					Addresses: request.Config.Addresses,
				},
			},
		},
		Status: api.TaskStatus{
			State:     api.TaskStateNew,
			Timestamp: ptypes.MustTimestampProto(time.Now()),
			Message:   "created",
		},
		DesiredState: api.TaskStateRunning,
		// TODO: Add Network attachment.
	}

	if err := ra.store.Update(func(tx store.Tx) error {
		return store.CreateTask(tx, t)
	}); err != nil {
		return nil, err
	}

	return &api.AttachNetworkResponse{AttachmentID: t.ID}, nil
}

// gets the node IP from the context of a grpc call
func nodeIPFromContext(ctx context.Context) (string, error) {
	nodeInfo, err := ca.RemoteNode(ctx)
	if err != nil {
		return "", err
	}
	addr, _, err := net.SplitHostPort(nodeInfo.RemoteAddr)
	if err != nil {
		return "", errors.Wrap(err, "unable to get ip from addr:port")
	}
	return addr, nil
}

// ListenSubscriptions returns a stream of matching subscriptions for the current node
func (lb *LogBroker) ListenSubscriptions(request *api.ListenSubscriptionsRequest, stream api.LogBroker_ListenSubscriptionsServer) error {
	remote, err := ca.RemoteNode(stream.Context())
	if err != nil {
		return err
	}

	log := log.G(stream.Context()).WithFields(
		logrus.Fields{
			"method": "(*LogBroker).ListenSubscriptions",
			"node":   remote.NodeID,
		},
	)
	subscriptions, subscriptionCh, subscriptionCancel := lb.watchSubscriptions()
	defer subscriptionCancel()

	log.Debug("node registered")

	// Start by sending down all active subscriptions.
	for _, subscription := range subscriptions {
		select {
		case <-stream.Context().Done():
			return stream.Context().Err()
		case <-lb.pctx.Done():
			return nil
		default:
		}

		if err := stream.Send(subscription); err != nil {
			log.Error(err)
			return err
		}
	}

	// Send down new subscriptions.
	// TODO(aluzzardi): We should filter by relevant tasks for this node rather
	for {
		select {
		case v := <-subscriptionCh:
			subscription := v.(*api.SubscriptionMessage)
			if err := stream.Send(subscription); err != nil {
				log.Error(err)
				return err
			}
		case <-stream.Context().Done():
			return stream.Context().Err()
		case <-lb.pctx.Done():
			return nil
		}
	}
}

// Join asks to a member of the raft to propose
// a configuration change and add us as a member thus
// beginning the log replication process. This method
// is called from an aspiring member to an existing member
func (n *Node) Join(ctx context.Context, req *api.JoinRequest) (*api.JoinResponse, error) {
	nodeInfo, err := ca.RemoteNode(ctx)
	if err != nil {
		return nil, err
	}

	fields := logrus.Fields{
		"node.id": nodeInfo.NodeID,
		"method":  "(*Node).Join",
	}
	if nodeInfo.ForwardedBy != nil {
		fields["forwarder.id"] = nodeInfo.ForwardedBy.NodeID
	}
	log := log.G(ctx).WithFields(fields)

	raftID, err := identity.ParseNodeID(nodeInfo.NodeID)
	if err != nil {
		return nil, err
	}

	// can't stop the raft node while an async RPC is in progress
	n.stopMu.RLock()
	defer n.stopMu.RUnlock()

	if n.Node == nil {
		log.WithError(ErrStopped).Errorf(ErrStopped.Error())
		return nil, ErrStopped
	}

	// We submit a configuration change only if the node was not registered yet
	if n.cluster.GetMember(raftID) == nil {
		err = n.addMember(ctx, req.Addr, raftID)
		if err != nil {
			log.WithError(err).Errorf("failed to add member")
			return nil, err
		}
	}

	var nodes []*api.RaftMember
	for _, node := range n.cluster.Members() {
		nodes = append(nodes, &api.RaftMember{
			RaftID: node.RaftID,
			Addr:   node.Addr,
		})
	}
	log.Debugf("node joined")

	return &api.JoinResponse{Members: nodes}, nil
}

// PublishLogs publishes log messages for a given subscription
func (lb *LogBroker) PublishLogs(stream api.LogBroker_PublishLogsServer) (err error) {
	remote, err := ca.RemoteNode(stream.Context())
	if err != nil {
		return err
	}

	var currentSubscription *subscription
	defer func() {
		if currentSubscription != nil {
			currentSubscription.Done(remote.NodeID, err)
		}
	}()

	for {
		log, err := stream.Recv()
		if err == io.EOF {
			return stream.SendAndClose(&api.PublishLogsResponse{})
		}
		if err != nil {
			return err
		}

		if log.SubscriptionID == "" {
			return grpc.Errorf(codes.InvalidArgument, "missing subscription ID")
		}

		if currentSubscription == nil {
			currentSubscription = lb.getSubscription(log.SubscriptionID)
			if currentSubscription == nil {
				return grpc.Errorf(codes.NotFound, "unknown subscription ID")
			}
		} else {
			if log.SubscriptionID != currentSubscription.message.ID {
				return grpc.Errorf(codes.InvalidArgument, "different subscription IDs in the same session")
			}
		}

		// Make sure logs are emitted using the right Node ID to avoid impersonation.
		for _, msg := range log.Messages {
			if msg.Context.NodeID != remote.NodeID {
				return grpc.Errorf(codes.PermissionDenied, "invalid NodeID: expected=%s;received=%s", remote.NodeID, msg.Context.NodeID)
			}
		}

		lb.publish(log)
	}
}

// ResolveAddress returns the address reaching for a given node ID.
func (n *Node) ResolveAddress(ctx context.Context, msg *api.ResolveAddressRequest) (*api.ResolveAddressResponse, error) {
	nodeInfo, err := ca.RemoteNode(ctx)
	if err != nil {
		return nil, err
	}

	fields := logrus.Fields{
		"node.id": nodeInfo.NodeID,
		"method":  "(*Node).ResolveAddress",
	}
	if nodeInfo.ForwardedBy != nil {
		fields["forwarder.id"] = nodeInfo.ForwardedBy.NodeID
	}
	log.G(ctx).WithFields(fields).Debugf("")

	member := n.cluster.GetMember(msg.RaftID)
	if member == nil {
		return nil, grpc.Errorf(codes.NotFound, "member %s not found", identity.FormatNodeID(msg.RaftID))
	}
	return &api.ResolveAddressResponse{Addr: member.Addr}, nil
}

// Join asks to a member of the raft to propose
// a configuration change and add us as a member thus
// beginning the log replication process. This method
// is called from an aspiring member to an existing member
func (n *Node) Join(ctx context.Context, req *api.JoinRequest) (*api.JoinResponse, error) {
	nodeInfo, err := ca.RemoteNode(ctx)
	if err != nil {
		return nil, err
	}

	fields := logrus.Fields{
		"node.id": nodeInfo.NodeID,
		"method":  "(*Node).Join",
		"raft_id": fmt.Sprintf("%x", n.Config.ID),
	}
	if nodeInfo.ForwardedBy != nil {
		fields["forwarder.id"] = nodeInfo.ForwardedBy.NodeID
	}
	log := log.G(ctx).WithFields(fields)
	log.Debug("")

	// can't stop the raft node while an async RPC is in progress
	n.stopMu.RLock()
	defer n.stopMu.RUnlock()

	n.membershipLock.Lock()
	defer n.membershipLock.Unlock()

	if !n.IsMember() {
		return nil, ErrNoRaftMember
	}

	if !n.isLeader() {
		return nil, ErrLostLeadership
	}

	// Find a unique ID for the joining member.
	var raftID uint64
	for {
		raftID = uint64(rand.Int63()) + 1
		if n.cluster.GetMember(raftID) == nil && !n.cluster.IsIDRemoved(raftID) {
			break
		}
	}

	remoteAddr := req.Addr

	// If the joining node sent an address like 0.0.0.0:4242, automatically
	// determine its actual address based on the GRPC connection. This
	// avoids the need for a prospective member to know its own address.

	requestHost, requestPort, err := net.SplitHostPort(remoteAddr)
	if err != nil {
		return nil, fmt.Errorf("invalid address %s in raft join request", remoteAddr)
	}

	requestIP := net.ParseIP(requestHost)
	if requestIP != nil && requestIP.IsUnspecified() {
		remoteHost, _, err := net.SplitHostPort(nodeInfo.RemoteAddr)
		if err != nil {
			return nil, err
		}
		remoteAddr = net.JoinHostPort(remoteHost, requestPort)
	}

	// We do not bother submitting a configuration change for the
	// new member if we can't contact it back using its address
	if err := n.checkHealth(ctx, remoteAddr, 5*time.Second); err != nil {
		return nil, err
	}

	err = n.addMember(ctx, remoteAddr, raftID, nodeInfo.NodeID)
	if err != nil {
		log.WithError(err).Errorf("failed to add member %x", raftID)
		return nil, err
	}

	var nodes []*api.RaftMember
	for _, node := range n.cluster.Members() {
		nodes = append(nodes, &api.RaftMember{
			RaftID: node.RaftID,
			NodeID: node.NodeID,
			Addr:   node.Addr,
		})
	}
	log.Debugf("node joined")

	return &api.JoinResponse{Members: nodes, RaftID: raftID}, nil
}

// Session is a stream which controls agent connection.
// Each message contains list of backup Managers with weights. Also there is
// a special boolean field Disconnect which if true indicates that node should
// reconnect to another Manager immediately.
func (d *Dispatcher) Session(r *api.SessionRequest, stream api.Dispatcher_SessionServer) error {
	ctx := stream.Context()
	nodeInfo, err := ca.RemoteNode(ctx)
	if err != nil {
		return err
	}
	nodeID := nodeInfo.NodeID

	if err := d.isRunningLocked(); err != nil {
		return err
	}

	// register the node.
	sessionID, err := d.register(stream.Context(), nodeID, r.Description)
	if err != nil {
		return err
	}

	fields := logrus.Fields{
		"node.id":      nodeID,
		"node.session": sessionID,
		"method":       "(*Dispatcher).Session",
	}
	if nodeInfo.ForwardedBy != nil {
		fields["forwarder.id"] = nodeInfo.ForwardedBy.NodeID
	}
	log := log.G(ctx).WithFields(fields)

	var nodeObj *api.Node
	nodeUpdates, cancel, err := store.ViewAndWatch(d.store, func(readTx store.ReadTx) error {
		nodeObj = store.GetNode(readTx, nodeID)
		return nil
	}, state.EventUpdateNode{Node: &api.Node{ID: nodeID},
		Checks: []state.NodeCheckFunc{state.NodeCheckID}},
	)
	if cancel != nil {
		defer cancel()
	}

	if err != nil {
		log.WithError(err).Error("ViewAndWatch Node failed")
	}

	if _, err = d.nodes.GetWithSession(nodeID, sessionID); err != nil {
		return err
	}

	if err := stream.Send(&api.SessionMessage{
		SessionID:            sessionID,
		Node:                 nodeObj,
		Managers:             d.getManagers(),
		NetworkBootstrapKeys: d.networkBootstrapKeys,
	}); err != nil {
		return err
	}

	managerUpdates, mgrCancel := d.mgrQueue.Watch()
	defer mgrCancel()
	keyMgrUpdates, keyMgrCancel := d.keyMgrQueue.Watch()
	defer keyMgrCancel()

	// disconnectNode is a helper forcibly shutdown connection
	disconnectNode := func() error {
		// force disconnect by shutting down the stream.
		transportStream, ok := transport.StreamFromContext(stream.Context())
		if ok {
			// if we have the transport stream, we can signal a disconnect
			// in the client.
			if err := transportStream.ServerTransport().Close(); err != nil {
				log.WithError(err).Error("session end")
			}
		}

		nodeStatus := api.NodeStatus{State: api.NodeStatus_DISCONNECTED, Message: "node is currently trying to find new manager"}
		if err := d.nodeRemove(nodeID, nodeStatus); err != nil {
			log.WithError(err).Error("failed to remove node")
		}
		// still return an abort if the transport closure was ineffective.
		return grpc.Errorf(codes.Aborted, "node must disconnect")
	}

	for {
		// After each message send, we need to check the nodes sessionID hasn't
		// changed. If it has, we will the stream and make the node
		// re-register.
		node, err := d.nodes.GetWithSession(nodeID, sessionID)
		if err != nil {
			return err
		}

		var mgrs []*api.WeightedPeer

		var disconnect bool

		select {
		case ev := <-managerUpdates:
//.........這裏部分代碼省略.........

// ListenSubscriptions returns a stream of matching subscriptions for the current node
func (lb *LogBroker) ListenSubscriptions(request *api.ListenSubscriptionsRequest, stream api.LogBroker_ListenSubscriptionsServer) error {
	remote, err := ca.RemoteNode(stream.Context())
	if err != nil {
		return err
	}

	lb.nodeConnected(remote.NodeID)
	defer lb.nodeDisconnected(remote.NodeID)

	log := log.G(stream.Context()).WithFields(
		logrus.Fields{
			"method": "(*LogBroker).ListenSubscriptions",
			"node":   remote.NodeID,
		},
	)
	subscriptions, subscriptionCh, subscriptionCancel := lb.watchSubscriptions(remote.NodeID)
	defer subscriptionCancel()

	log.Debug("node registered")

	activeSubscriptions := make(map[string]*subscription)
	defer func() {
		// If the worker quits, mark all active subscriptions as finished.
		for _, subscription := range activeSubscriptions {
			subscription.Done(remote.NodeID, fmt.Errorf("node %s disconnected unexpectedly", remote.NodeID))
		}
	}()

	// Start by sending down all active subscriptions.
	for _, subscription := range subscriptions {
		select {
		case <-stream.Context().Done():
			return stream.Context().Err()
		case <-lb.pctx.Done():
			return nil
		default:
		}

		if err := stream.Send(subscription.message); err != nil {
			log.Error(err)
			return err
		}
		activeSubscriptions[subscription.message.ID] = subscription
	}

	// Send down new subscriptions.
	for {
		select {
		case v := <-subscriptionCh:
			subscription := v.(*subscription)

			if subscription.message.Close {
				log.WithField("subscription.id", subscription.message.ID).Debug("subscription closed")
				delete(activeSubscriptions, subscription.message.ID)
			} else {
				// Avoid sending down the same subscription multiple times
				if _, ok := activeSubscriptions[subscription.message.ID]; ok {
					continue
				}
				activeSubscriptions[subscription.message.ID] = subscription
				log.WithField("subscription.id", subscription.message.ID).Debug("subscription added")
			}
			if err := stream.Send(subscription.message); err != nil {
				log.Error(err)
				return err
			}
		case <-stream.Context().Done():
			return stream.Context().Err()
		case <-lb.pctx.Done():
			return nil
		}
	}
}