Golang AssignmentsMessage.UpdateTasks方法代碼示例

// 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.........