Golang Batch.Update方法代码示例

// 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
}

func (r *ReplicatedOrchestrator) deleteTask(ctx context.Context, batch *store.Batch, t *api.Task) {
	err := batch.Update(func(tx store.Tx) error {
		return store.DeleteTask(tx, t.ID)
	})
	if err != nil {
		log.G(ctx).WithError(err).Errorf("deleting task %s failed", t.ID)
	}
}

func (g *Orchestrator) addTask(ctx context.Context, batch *store.Batch, service *api.Service, nodeID string) {
	task := orchestrator.NewTask(g.cluster, service, 0, nodeID)

	err := batch.Update(func(tx store.Tx) error {
		return store.CreateTask(tx, task)
	})
	if err != nil {
		log.G(ctx).WithError(err).Errorf("global orchestrator: failed to create task")
	}
}

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)
	}
}

func (a *Allocator) commitAllocatedNetwork(ctx context.Context, batch *store.Batch, n *api.Network) error {
	if err := batch.Update(func(tx store.Tx) error {
		if err := store.UpdateNetwork(tx, n); err != nil {
			return errors.Wrapf(err, "failed updating state in store transaction for network %s", n.ID)
		}
		return nil
	}); err != nil {
		if err := a.netCtx.nwkAllocator.Deallocate(n); err != nil {
			log.G(ctx).WithError(err).Errorf("failed rolling back allocation of network %s", n.ID)
		}

		return err
	}

	return 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 *ReplicatedOrchestrator) addTasks(ctx context.Context, batch *store.Batch, service *api.Service, runningSlots map[uint64]slot, count int) {
	slot := uint64(0)
	for i := 0; i < count; i++ {
		// Find an slot number that is missing a running task
		for {
			slot++
			if _, ok := runningSlots[slot]; !ok {
				break
			}
		}

		err := batch.Update(func(tx store.Tx) error {
			return store.CreateTask(tx, newTask(r.cluster, service, slot))
		})
		if err != nil {
			log.G(ctx).Errorf("Failed to create task: %v", err)
		}
	}
}

func (r *ReplicatedOrchestrator) addTasks(ctx context.Context, batch *store.Batch, service *api.Service, runningInstances map[uint64]struct{}, count int) {
	instance := uint64(0)
	for i := 0; i < count; i++ {
		// Find an instance number that is missing a running task
		for {
			instance++
			if _, ok := runningInstances[instance]; !ok {
				break
			}
		}

		err := batch.Update(func(tx store.Tx) error {
			return store.CreateTask(tx, newTask(service, instance))
		})
		if err != nil {
			log.G(ctx).Errorf("Failed to create task: %v", err)
		}
	}
}

func (a *Allocator) commitAllocatedService(ctx context.Context, batch *store.Batch, s *api.Service) error {
	if err := batch.Update(func(tx store.Tx) error {
		err := store.UpdateService(tx, s)

		if err == store.ErrSequenceConflict {
			storeService := store.GetService(tx, s.ID)
			storeService.Endpoint = s.Endpoint
			err = store.UpdateService(tx, storeService)
		}

		return errors.Wrapf(err, "failed updating state in store transaction for service %s", s.ID)
	}); err != nil {
		if err := a.netCtx.nwkAllocator.ServiceDeallocate(s); err != nil {
			log.G(ctx).WithError(err).Errorf("failed rolling back allocation of service %s", s.ID)
		}

		return err
	}

	return nil
}

func (a *Allocator) commitAllocatedNode(ctx context.Context, batch *store.Batch, node *api.Node) error {
	if err := batch.Update(func(tx store.Tx) error {
		err := store.UpdateNode(tx, node)

		if err == store.ErrSequenceConflict {
			storeNode := store.GetNode(tx, node.ID)
			storeNode.Attachment = node.Attachment.Copy()
			err = store.UpdateNode(tx, storeNode)
		}

		return errors.Wrapf(err, "failed updating state in store transaction for node %s", node.ID)
	}); err != nil {
		if err := a.netCtx.nwkAllocator.DeallocateNode(node); err != nil {
			log.G(ctx).WithError(err).Errorf("failed rolling back allocation of node %s", node.ID)
		}

		return err
	}

	return nil
}