Golang store.GetTask函數代碼示例

func (u *Updater) useExistingTask(ctx context.Context, slot slot, existing *api.Task) {
	var removeTasks []*api.Task
	for _, t := range slot {
		if t != existing {
			removeTasks = append(removeTasks, t)
		}
	}
	if len(removeTasks) != 0 || existing.DesiredState != api.TaskStateRunning {
		_, err := u.store.Batch(func(batch *store.Batch) error {
			u.removeOldTasks(ctx, batch, removeTasks)

			if existing.DesiredState != api.TaskStateRunning {
				err := batch.Update(func(tx store.Tx) error {
					t := store.GetTask(tx, existing.ID)
					if t == nil {
						return fmt.Errorf("task %s not found while trying to start it", existing.ID)
					}
					if t.DesiredState >= api.TaskStateRunning {
						return fmt.Errorf("task %s was already started when reached by updater", existing.ID)
					}
					t.DesiredState = api.TaskStateRunning
					return store.UpdateTask(tx, t)
				})
				if err != nil {
					log.G(ctx).WithError(err).Errorf("starting task %s failed", existing.ID)
				}
			}
			return nil
		})
		if err != nil {
			log.G(ctx).WithError(err).Error("updater batch transaction failed")
		}
	}
}

func (r *Supervisor) waitRestart(ctx context.Context, oldDelay *delayedStart, cluster *api.Cluster, taskID string) {
	// Wait for the last restart delay to elapse.
	select {
	case <-oldDelay.doneCh:
	case <-ctx.Done():
		return
	}

	// Start the next restart
	err := r.store.Update(func(tx store.Tx) error {
		t := store.GetTask(tx, taskID)
		if t == nil {
			return nil
		}
		if t.DesiredState > api.TaskStateRunning {
			return nil
		}
		service := store.GetService(tx, t.ServiceID)
		if service == nil {
			return nil
		}
		return r.Restart(ctx, tx, cluster, service, *t)
	})

	if err != nil {
		log.G(ctx).WithError(err).Errorf("failed to restart task after waiting for previous restart")
	}
}

// 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
}

// removeOldTasks shuts down the given tasks and returns one of the tasks that
// was shut down, or an error.
func (u *Updater) removeOldTasks(ctx context.Context, batch *store.Batch, removeTasks []*api.Task) (*api.Task, error) {
	var (
		lastErr     error
		removedTask *api.Task
	)
	for _, original := range removeTasks {
		err := batch.Update(func(tx store.Tx) error {
			t := store.GetTask(tx, original.ID)
			if t == nil {
				return fmt.Errorf("task %s not found while trying to shut it down", original.ID)
			}
			if t.DesiredState > api.TaskStateRunning {
				return fmt.Errorf("task %s was already shut down when reached by updater", original.ID)
			}
			t.DesiredState = api.TaskStateShutdown
			return store.UpdateTask(tx, t)
		})
		if err != nil {
			lastErr = err
		} else {
			removedTask = original
		}
	}

	if removedTask == nil {
		return nil, lastErr
	}
	return removedTask, nil
}

// StartNow moves the task into the RUNNING state so it will proceed to start
// up.
func (r *Supervisor) StartNow(tx store.Tx, taskID string) error {
	t := store.GetTask(tx, taskID)
	if t == nil || t.DesiredState >= api.TaskStateRunning {
		return nil
	}
	t.DesiredState = api.TaskStateRunning
	return store.UpdateTask(tx, t)
}

func (u *Updater) updateTask(ctx context.Context, original, updated *api.Task) error {
	log.G(ctx).Debugf("replacing %s with %s", original.ID, updated.ID)
	// Kick off the watch before even creating the updated task. This is in order to avoid missing any event.
	taskUpdates, cancel := state.Watch(u.watchQueue, state.EventUpdateTask{
		Task:   &api.Task{ID: updated.ID},
		Checks: []state.TaskCheckFunc{state.TaskCheckID},
	})
	defer cancel()

	var delayStartCh <-chan struct{}
	// Atomically create the updated task and bring down the old one.
	err := u.store.Update(func(tx store.Tx) error {
		t := store.GetTask(tx, original.ID)
		if t == nil {
			return fmt.Errorf("task %s not found while trying to update it", original.ID)
		}
		if t.DesiredState > api.TaskStateRunning {
			return fmt.Errorf("task %s was already shut down when reached by updater", original.ID)
		}
		t.DesiredState = api.TaskStateShutdown
		if err := store.UpdateTask(tx, t); err != nil {
			return err
		}

		if err := store.CreateTask(tx, updated); err != nil {
			return err
		}

		// Wait for the old task to stop or time out, and then set the new one
		// to RUNNING.
		delayStartCh = u.restarts.DelayStart(ctx, tx, original, updated.ID, 0, true)

		return nil

	})
	if err != nil {
		return err
	}

	<-delayStartCh

	// Wait for the new task to come up.
	// TODO(aluzzardi): Consider adding a timeout here.
	for {
		select {
		case e := <-taskUpdates:
			updated = e.(state.EventUpdateTask).Task
			if updated.Status.State >= api.TaskStateRunning {
				return nil
			}
		case <-u.stopChan:
			return nil
		}
	}
}

func (d *Dispatcher) processTaskUpdates() {
	d.taskUpdatesLock.Lock()
	if len(d.taskUpdates) == 0 {
		d.taskUpdatesLock.Unlock()
		return
	}
	taskUpdates := d.taskUpdates
	d.taskUpdates = make(map[string]*api.TaskStatus)
	d.taskUpdatesLock.Unlock()

	log := log.G(d.ctx).WithFields(logrus.Fields{
		"method": "(*Dispatcher).processTaskUpdates",
	})

	_, err := d.store.Batch(func(batch *store.Batch) error {
		for taskID, status := range taskUpdates {
			err := batch.Update(func(tx store.Tx) error {
				logger := log.WithField("task.id", taskID)
				task := store.GetTask(tx, taskID)
				if task == nil {
					logger.Errorf("task unavailable")
					return nil
				}

				logger = logger.WithField("state.transition", fmt.Sprintf("%v->%v", task.Status.State, status.State))

				if task.Status == *status {
					logger.Debug("task status identical, ignoring")
					return nil
				}

				if task.Status.State > status.State {
					logger.Debug("task status invalid transition")
					return nil
				}

				task.Status = *status
				if err := store.UpdateTask(tx, task); err != nil {
					logger.WithError(err).Error("failed to update task status")
					return nil
				}
				logger.Debug("task status updated")
				return nil
			})
			if err != nil {
				log.WithError(err).Error("dispatcher transaction failed")
			}
		}
		return nil
	})
	if err != nil {
		log.WithError(err).Error("dispatcher batch failed")
	}
}

func (g *GlobalOrchestrator) removeTask(ctx context.Context, batch *store.Batch, t *api.Task) {
	// set existing task DesiredState to TaskStateShutdown
	// TODO(aaronl): optimistic update?
	err := batch.Update(func(tx store.Tx) error {
		t = store.GetTask(tx, t.ID)
		if t != nil {
			t.DesiredState = api.TaskStateShutdown
			return store.UpdateTask(tx, t)
		}
		return nil
	})
	if err != nil {
		log.G(ctx).WithError(err).Errorf("global orchestrator: removeTask failed to remove %s", t.ID)
	}
}

// restartTask calls the restart supervisor's Restart function, which
// sets a task's desired state to dead and restarts it if the restart
// policy calls for it to be restarted.
func (g *GlobalOrchestrator) restartTask(ctx context.Context, taskID string, serviceID string) {
	err := g.store.Update(func(tx store.Tx) error {
		t := store.GetTask(tx, taskID)
		if t == nil || t.DesiredState > api.TaskStateRunning {
			return nil
		}
		service := store.GetService(tx, serviceID)
		if service == nil {
			return nil
		}
		return g.restarts.Restart(ctx, tx, service, *t)
	})
	if err != nil {
		log.G(ctx).WithError(err).Errorf("global orchestrator: restartTask transaction failed")
	}
}

// GetTask returns a Task given a TaskID.
// - Returns `InvalidArgument` if TaskID is not provided.
// - Returns `NotFound` if the Task is not found.
func (s *Server) GetTask(ctx context.Context, request *api.GetTaskRequest) (*api.GetTaskResponse, error) {
	if request.TaskID == "" {
		return nil, grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
	}

	var task *api.Task
	s.store.View(func(tx store.ReadTx) {
		task = store.GetTask(tx, request.TaskID)
	})
	if task == nil {
		return nil, grpc.Errorf(codes.NotFound, "task %s not found", request.TaskID)
	}
	return &api.GetTaskResponse{
		Task: task,
	}, nil
}

func (r *ReplicatedOrchestrator) removeTasks(ctx context.Context, batch *store.Batch, service *api.Service, tasks []*api.Task) {
	for _, t := range tasks {
		err := batch.Update(func(tx store.Tx) error {
			// TODO(aaronl): optimistic update?
			t = store.GetTask(tx, t.ID)
			if t != nil {
				t.DesiredState = api.TaskStateShutdown
				return store.UpdateTask(tx, t)
			}
			return nil
		})
		if err != nil {
			log.G(ctx).WithError(err).Errorf("removing task %s failed", t.ID)
		}
	}
}

func (a *Allocator) commitAllocatedTask(ctx context.Context, batch *store.Batch, t *api.Task) error {
	return batch.Update(func(tx store.Tx) error {
		err := store.UpdateTask(tx, t)

		if err == store.ErrSequenceConflict {
			storeTask := store.GetTask(tx, t.ID)
			taskUpdateNetworks(storeTask, t.Networks)
			taskUpdateEndpoint(storeTask, t.Endpoint)
			if storeTask.Status.State < api.TaskStatePending {
				storeTask.Status = t.Status
			}
			err = store.UpdateTask(tx, storeTask)
		}

		return errors.Wrapf(err, "failed updating state in store transaction for task %s", t.ID)
	})
}

func (u *Updater) removeOldTasks(ctx context.Context, batch *store.Batch, removeTasks []*api.Task) {
	for _, original := range removeTasks {
		err := batch.Update(func(tx store.Tx) error {
			t := store.GetTask(tx, original.ID)
			if t == nil {
				return fmt.Errorf("task %s not found while trying to shut it down", original.ID)
			}
			if t.DesiredState > api.TaskStateRunning {
				return fmt.Errorf("task %s was already shut down when reached by updater", original.ID)
			}
			t.DesiredState = api.TaskStateShutdown
			return store.UpdateTask(tx, t)
		})
		if err != nil {
			log.G(ctx).WithError(err).Errorf("shutting down stale task %s failed", original.ID)
		}
	}
}

func (r *Orchestrator) tickTasks(ctx context.Context) {
	if len(r.restartTasks) > 0 {
		_, err := r.store.Batch(func(batch *store.Batch) error {
			for taskID := range r.restartTasks {
				err := batch.Update(func(tx store.Tx) error {
					// TODO(aaronl): optimistic update?
					t := store.GetTask(tx, taskID)
					if t != nil {
						if t.DesiredState > api.TaskStateRunning {
							return nil
						}

						service := store.GetService(tx, t.ServiceID)
						if !orchestrator.IsReplicatedService(service) {
							return nil
						}

						// Restart task if applicable
						if err := r.restarts.Restart(ctx, tx, r.cluster, service, *t); err != nil {
							return err
						}
					}
					return nil
				})
				if err != nil {
					log.G(ctx).WithError(err).Errorf("Orchestrator task reaping transaction failed")
				}
			}
			return nil
		})

		if err != nil {
			log.G(ctx).WithError(err).Errorf("orchestrator task removal batch failed")
		}

		r.restartTasks = make(map[string]struct{})
	}
}

func (s *subscription) match() {
	s.mu.Lock()
	defer s.mu.Unlock()

	add := func(t *api.Task) {
		if t.NodeID == "" {
			s.pendingTasks[t.ID] = struct{}{}
			return
		}
		if _, ok := s.nodes[t.NodeID]; !ok {
			s.nodes[t.NodeID] = struct{}{}
			s.wg.Add(1)
		}
	}

	s.store.View(func(tx store.ReadTx) {
		for _, nid := range s.message.Selector.NodeIDs {
			s.nodes[nid] = struct{}{}
		}

		for _, tid := range s.message.Selector.TaskIDs {
			if task := store.GetTask(tx, tid); task != nil {
				add(task)
			}
		}

		for _, sid := range s.message.Selector.ServiceIDs {
			tasks, err := store.FindTasks(tx, store.ByServiceID(sid))
			if err != nil {
				log.L.Warning(err)
				continue
			}
			for _, task := range tasks {
				add(task)
			}
		}
	})
}