Golang log.Debugf函數代碼示例

func (s *session) logSubscriptions(ctx context.Context) error {
	log := log.G(ctx).WithFields(logrus.Fields{"method": "(*session).logSubscriptions"})
	log.Debugf("")

	client := api.NewLogBrokerClient(s.conn)
	subscriptions, err := client.ListenSubscriptions(ctx, &api.ListenSubscriptionsRequest{})
	if err != nil {
		return err
	}
	defer subscriptions.CloseSend()

	for {
		resp, err := subscriptions.Recv()
		if err != nil {
			return err
		}

		select {
		case s.subscriptions <- resp:
		case <-s.closed:
			return errSessionClosed
		case <-ctx.Done():
			return ctx.Err()
		}
	}
}

func (d *Dispatcher) markNodesUnknown(ctx context.Context) error {
	log := log.G(ctx).WithField("method", "(*Dispatcher).markNodesUnknown")
	var nodes []*api.Node
	var err error
	d.store.View(func(tx store.ReadTx) {
		nodes, err = store.FindNodes(tx, store.All)
	})
	if err != nil {
		return fmt.Errorf("failed to get list of nodes: %v", err)
	}
	_, err = d.store.Batch(func(batch *store.Batch) error {
		for _, n := range nodes {
			err := batch.Update(func(tx store.Tx) error {
				// check if node is still here
				node := store.GetNode(tx, n.ID)
				if node == nil {
					return nil
				}
				// do not try to resurrect down nodes
				if node.Status.State == api.NodeStatus_DOWN {
					return nil
				}
				node.Status = api.NodeStatus{
					State:   api.NodeStatus_UNKNOWN,
					Message: `Node moved to "unknown" state due to leadership change in cluster`,
				}
				nodeID := node.ID

				expireFunc := func() {
					log := log.WithField("node", nodeID)
					nodeStatus := api.NodeStatus{State: api.NodeStatus_DOWN, Message: `heartbeat failure for node in "unknown" state`}
					log.Debugf("heartbeat expiration for unknown node")
					if err := d.nodeRemove(nodeID, nodeStatus); err != nil {
						log.WithError(err).Errorf(`failed deregistering node after heartbeat expiration for node in "unknown" state`)
					}
				}
				if err := d.nodes.AddUnknown(node, expireFunc); err != nil {
					return fmt.Errorf(`adding node in "unknown" state to node store failed: %v`, err)
				}
				if err := store.UpdateNode(tx, node); err != nil {
					return fmt.Errorf("update failed %v", err)
				}
				return nil
			})
			if err != nil {
				log.WithField("node", n.ID).WithError(err).Errorf(`failed to move node to "unknown" state`)
			}
		}
		return nil
	})
	return err
}

// 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
}

func (s *session) logSubscriptions(ctx context.Context) error {
	log := log.G(ctx).WithFields(logrus.Fields{"method": "(*session).logSubscriptions"})
	log.Debugf("")

	client := api.NewLogBrokerClient(s.conn)
	subscriptions, err := client.ListenSubscriptions(ctx, &api.ListenSubscriptionsRequest{})
	if err != nil {
		return err
	}
	defer subscriptions.CloseSend()

	for {
		resp, err := subscriptions.Recv()
		if grpc.Code(err) == codes.Unimplemented {
			log.Warning("manager does not support log subscriptions")
			// Don't return, because returning would bounce the session
			select {
			case <-s.closed:
				return errSessionClosed
			case <-ctx.Done():
				return ctx.Err()
			}
		}
		if err != nil {
			return err
		}

		select {
		case s.subscriptions <- resp:
		case <-s.closed:
			return errSessionClosed
		case <-ctx.Done():
			return ctx.Err()
		}
	}
}

// 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
}

// Assignments is a stream of assignments for a node. Each message contains
// either full list of tasks and secrets for the node, or an incremental update.
func (d *Dispatcher) Assignments(r *api.AssignmentsRequest, stream api.Dispatcher_AssignmentsServer) error {
	nodeInfo, err := ca.RemoteNode(stream.Context())
	if err != nil {
		return err
	}
	nodeID := nodeInfo.NodeID

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

	fields := logrus.Fields{
		"node.id":      nodeID,
		"node.session": r.SessionID,
		"method":       "(*Dispatcher).Assignments",
	}
	if nodeInfo.ForwardedBy != nil {
		fields["forwarder.id"] = nodeInfo.ForwardedBy.NodeID
	}
	log := log.G(stream.Context()).WithFields(fields)
	log.Debugf("")

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

	var (
		sequence  int64
		appliesTo string
		initial   api.AssignmentsMessage
	)
	tasksMap := make(map[string]*api.Task)
	tasksUsingSecret := make(map[string]map[string]struct{})

	sendMessage := func(msg api.AssignmentsMessage, assignmentType api.AssignmentsMessage_Type) error {
		sequence++
		msg.AppliesTo = appliesTo
		msg.ResultsIn = strconv.FormatInt(sequence, 10)
		appliesTo = msg.ResultsIn
		msg.Type = assignmentType

		if err := stream.Send(&msg); err != nil {
			return err
		}
		return nil
	}

	// returns a slice of new secrets to send down
	addSecretsForTask := func(readTx store.ReadTx, t *api.Task) []*api.Secret {
		container := t.Spec.GetContainer()
		if container == nil {
			return nil
		}
		var newSecrets []*api.Secret
		for _, secretRef := range container.Secrets {
			// Empty ID prefix will return all secrets. Bail if there is no SecretID
			if secretRef.SecretID == "" {
				log.Debugf("invalid secret reference")
				continue
			}
			secretID := secretRef.SecretID
			log := log.WithFields(logrus.Fields{
				"secret.id":   secretID,
				"secret.name": secretRef.SecretName,
			})

			if len(tasksUsingSecret[secretID]) == 0 {
				tasksUsingSecret[secretID] = make(map[string]struct{})

				secrets, err := store.FindSecrets(readTx, store.ByIDPrefix(secretID))
				if err != nil {
					log.WithError(err).Errorf("error retrieving secret")
					continue
				}
				if len(secrets) != 1 {
					log.Debugf("secret not found")
					continue
				}

				// If the secret was found and there was one result
				// (there should never be more than one because of the
				// uniqueness constraint), add this secret to our
				// initial set that we send down.
				newSecrets = append(newSecrets, secrets[0])
			}
			tasksUsingSecret[secretID][t.ID] = struct{}{}
		}

		return newSecrets
	}

	// TODO(aaronl): Also send node secrets that should be exposed to
	// this node.
	nodeTasks, cancel, err := store.ViewAndWatch(
		d.store,
		func(readTx store.ReadTx) error {
			tasks, err := store.FindTasks(readTx, store.ByNodeID(nodeID))
//.........這裏部分代碼省略.........

func (d *Dispatcher) markNodesUnknown(ctx context.Context) error {
	log := log.G(ctx).WithField("method", "(*Dispatcher).markNodesUnknown")
	var nodes []*api.Node
	var err error
	d.store.View(func(tx store.ReadTx) {
		nodes, err = store.FindNodes(tx, store.All)
	})
	if err != nil {
		return errors.Wrap(err, "failed to get list of nodes")
	}
	_, err = d.store.Batch(func(batch *store.Batch) error {
		for _, n := range nodes {
			err := batch.Update(func(tx store.Tx) error {
				// check if node is still here
				node := store.GetNode(tx, n.ID)
				if node == nil {
					return nil
				}
				// do not try to resurrect down nodes
				if node.Status.State == api.NodeStatus_DOWN {
					nodeCopy := node
					expireFunc := func() {
						if err := d.moveTasksToOrphaned(nodeCopy.ID); err != nil {
							log.WithError(err).Error(`failed to move all tasks to "ORPHANED" state`)
						}

						d.downNodes.Delete(nodeCopy.ID)
					}

					d.downNodes.Add(nodeCopy, expireFunc)
					return nil
				}

				node.Status.State = api.NodeStatus_UNKNOWN
				node.Status.Message = `Node moved to "unknown" state due to leadership change in cluster`

				nodeID := node.ID

				expireFunc := func() {
					log := log.WithField("node", nodeID)
					log.Debugf("heartbeat expiration for unknown node")
					if err := d.markNodeNotReady(nodeID, api.NodeStatus_DOWN, `heartbeat failure for node in "unknown" state`); err != nil {
						log.WithError(err).Errorf(`failed deregistering node after heartbeat expiration for node in "unknown" state`)
					}
				}
				if err := d.nodes.AddUnknown(node, expireFunc); err != nil {
					return errors.Wrap(err, `adding node in "unknown" state to node store failed`)
				}
				if err := store.UpdateNode(tx, node); err != nil {
					return errors.Wrap(err, "update failed")
				}
				return nil
			})
			if err != nil {
				log.WithField("node", n.ID).WithError(err).Errorf(`failed to move node to "unknown" state`)
			}
		}
		return nil
	})
	return err
}

func (s *session) watch(ctx context.Context) error {
	log := log.G(ctx).WithFields(logrus.Fields{"method": "(*session).watch"})
	log.Debugf("")
	var (
		resp            *api.AssignmentsMessage
		assignmentWatch api.Dispatcher_AssignmentsClient
		tasksWatch      api.Dispatcher_TasksClient
		streamReference string
		tasksFallback   bool
		err             error
	)

	client := api.NewDispatcherClient(s.conn)
	for {
		// If this is the first time we're running the loop, or there was a reference mismatch
		// attempt to get the assignmentWatch
		if assignmentWatch == nil && !tasksFallback {
			assignmentWatch, err = client.Assignments(ctx, &api.AssignmentsRequest{SessionID: s.sessionID})
			if err != nil {
				return err
			}
		}
		// We have an assignmentWatch, let's try to receive an AssignmentMessage
		if assignmentWatch != nil {
			// If we get a code = 12 desc = unknown method Assignments, try to use tasks
			resp, err = assignmentWatch.Recv()
			if err != nil {
				if grpc.Code(err) != codes.Unimplemented {
					return err
				}
				tasksFallback = true
				assignmentWatch = nil
				log.WithError(err).Infof("falling back to Tasks")
			}
		}

		// This code is here for backwards compatibility (so that newer clients can use the
		// older method Tasks)
		if tasksWatch == nil && tasksFallback {
			tasksWatch, err = client.Tasks(ctx, &api.TasksRequest{SessionID: s.sessionID})
			if err != nil {
				return err
			}
		}
		if tasksWatch != nil {
			// When falling back to Tasks because of an old managers, we wrap the tasks in assignments.
			var taskResp *api.TasksMessage
			var assignmentChanges []*api.AssignmentChange
			taskResp, err = tasksWatch.Recv()
			if err != nil {
				return err
			}
			for _, t := range taskResp.Tasks {
				taskChange := &api.AssignmentChange{
					Assignment: &api.Assignment{
						Item: &api.Assignment_Task{
							Task: t,
						},
					},
					Action: api.AssignmentChange_AssignmentActionUpdate,
				}

				assignmentChanges = append(assignmentChanges, taskChange)
			}
			resp = &api.AssignmentsMessage{Type: api.AssignmentsMessage_COMPLETE, Changes: assignmentChanges}
		}

		// If there seems to be a gap in the stream, let's break out of the inner for and
		// re-sync (by calling Assignments again).
		if streamReference != "" && streamReference != resp.AppliesTo {
			assignmentWatch = nil
		} else {
			streamReference = resp.ResultsIn
		}

		select {
		case s.assignments <- resp:
		case <-s.closed:
			return errSessionClosed
		case <-ctx.Done():
			return ctx.Err()
		}
	}
}

// Assignments is a stream of assignments for a node. Each message contains
// either full list of tasks and secrets for the node, or an incremental update.
func (d *Dispatcher) Assignments(r *api.AssignmentsRequest, stream api.Dispatcher_AssignmentsServer) error {
	nodeInfo, err := ca.RemoteNode(stream.Context())
	if err != nil {
		return err
	}
	nodeID := nodeInfo.NodeID

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

	fields := logrus.Fields{
		"node.id":      nodeID,
		"node.session": r.SessionID,
		"method":       "(*Dispatcher).Assignments",
	}
	if nodeInfo.ForwardedBy != nil {
		fields["forwarder.id"] = nodeInfo.ForwardedBy.NodeID
	}
	log := log.G(stream.Context()).WithFields(fields)
	log.Debugf("")

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

	var (
		sequence  int64
		appliesTo string
		initial   api.AssignmentsMessage
	)
	tasksMap := make(map[string]*api.Task)

	sendMessage := func(msg api.AssignmentsMessage, assignmentType api.AssignmentsMessage_Type) error {
		sequence++
		msg.AppliesTo = appliesTo
		msg.ResultsIn = strconv.FormatInt(sequence, 10)
		appliesTo = msg.ResultsIn
		msg.Type = assignmentType

		if err := stream.Send(&msg); err != nil {
			return err
		}
		return nil
	}

	// TODO(aaronl): Also send node secrets that should be exposed to
	// this node.
	nodeTasks, cancel, err := store.ViewAndWatch(
		d.store,
		func(readTx store.ReadTx) error {
			tasks, err := store.FindTasks(readTx, store.ByNodeID(nodeID))
			if err != nil {
				return err
			}

			for _, t := range tasks {
				// We only care about tasks that are ASSIGNED or
				// higher. If the state is below ASSIGNED, the
				// task may not meet the constraints for this
				// node, so we have to be careful about sending
				// secrets associated with it.
				if t.Status.State < api.TaskStateAssigned {
					continue
				}

				tasksMap[t.ID] = t
				initial.UpdateTasks = append(initial.UpdateTasks, t)
			}
			return nil
		},
		state.EventUpdateTask{Task: &api.Task{NodeID: nodeID},
			Checks: []state.TaskCheckFunc{state.TaskCheckNodeID}},
		state.EventDeleteTask{Task: &api.Task{NodeID: nodeID},
			Checks: []state.TaskCheckFunc{state.TaskCheckNodeID}},
	)
	if err != nil {
		return err
	}
	defer cancel()

	if err := sendMessage(initial, api.AssignmentsMessage_COMPLETE); err != nil {
		return err
	}

	for {
		// Check for session expiration
		if _, err := d.nodes.GetWithSession(nodeID, r.SessionID); err != nil {
			return err
		}

		// bursty events should be processed in batches and sent out together
		var (
			update          api.AssignmentsMessage
			modificationCnt int
			batchingTimer   *time.Timer
			batchingTimeout <-chan time.Time
			updateTasks     = make(map[string]*api.Task)
//.........這裏部分代碼省略.........