Golang AssignmentsMessage.RemoveTasks方法代码示例

//.........这里部分代码省略.........
		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)
			removeTasks     = make(map[string]struct{})
		)

		oneModification := func() {
			modificationCnt++

			if batchingTimer != nil {
				batchingTimer.Reset(batchingWaitTime)
			} else {
				batchingTimer = time.NewTimer(batchingWaitTime)
				batchingTimeout = batchingTimer.C
			}
		}

		// The batching loop waits for 50 ms after the most recent
		// change, or until modificationBatchLimit is reached. The
		// worst case latency is modificationBatchLimit * batchingWaitTime,
		// which is 10 seconds.
	batchingLoop:
		for modificationCnt < modificationBatchLimit {
			select {
			case event := <-nodeTasks:
				switch v := event.(type) {
				// We don't monitor EventCreateTask because tasks are
				// never created in the ASSIGNED state. First tasks are
				// created by the orchestrator, then the scheduler moves
				// them to ASSIGNED. If this ever changes, we will need
				// to monitor task creations as well.
				case state.EventUpdateTask:
					// We only care about tasks that are ASSIGNED or
					// higher.
					if v.Task.Status.State < api.TaskStateAssigned {
						continue
					}

					if oldTask, exists := tasksMap[v.Task.ID]; exists {
						// States ASSIGNED and below are set by the orchestrator/scheduler,
						// not the agent, so tasks in these states need to be sent to the
						// agent even if nothing else has changed.
						if equality.TasksEqualStable(oldTask, v.Task) && v.Task.Status.State > api.TaskStateAssigned {
							// this update should not trigger a task change for the agent
							tasksMap[v.Task.ID] = v.Task
							continue
						}
					}
					tasksMap[v.Task.ID] = v.Task
					updateTasks[v.Task.ID] = v.Task

					oneModification()
				case state.EventDeleteTask:

					if _, exists := tasksMap[v.Task.ID]; !exists {
						continue
					}

					removeTasks[v.Task.ID] = struct{}{}

					delete(tasksMap, v.Task.ID)

					oneModification()
				}
			case <-batchingTimeout:
				break batchingLoop
			case <-stream.Context().Done():
				return stream.Context().Err()
			case <-d.ctx.Done():
				return d.ctx.Err()
			}
		}

		if batchingTimer != nil {
			batchingTimer.Stop()
		}

		if modificationCnt > 0 {
			for id, task := range updateTasks {
				if _, ok := removeTasks[id]; !ok {
					update.UpdateTasks = append(update.UpdateTasks, task)
				}
			}
			for id := range removeTasks {
				update.RemoveTasks = append(update.RemoveTasks, id)
			}
			if err := sendMessage(update, api.AssignmentsMessage_INCREMENTAL); err != nil {
				return err
			}
		}
	}
}