// updateSummaryWithJob creates or updates job summaries when new jobs are
// upserted or existing ones are updated
func (s *StateStore) updateSummaryWithJob(index uint64, job *structs.Job,
	watcher watch.Items, txn *memdb.Txn) error {

	existing, err := s.JobSummaryByID(job.ID)
	if err != nil {
		return fmt.Errorf("unable to retrieve summary for job: %v", err)
	}
	var hasSummaryChanged bool
	if existing == nil {
		existing = &structs.JobSummary{
			JobID:       job.ID,
			Summary:     make(map[string]structs.TaskGroupSummary),
			CreateIndex: index,
		}
		hasSummaryChanged = true
	}
	for _, tg := range job.TaskGroups {
		if _, ok := existing.Summary[tg.Name]; !ok {
			newSummary := structs.TaskGroupSummary{
				Complete: 0,
				Failed:   0,
				Running:  0,
				Starting: 0,
			}
			existing.Summary[tg.Name] = newSummary
			hasSummaryChanged = true
		}
	}

	// The job summary has changed, so add to watcher and update the modify
	// index.
	if hasSummaryChanged {
		existing.ModifyIndex = index
		watcher.Add(watch.Item{Table: "job_summary"})
		watcher.Add(watch.Item{JobSummary: job.ID})

		// Update the indexes table for job summary
		if err := txn.Insert("index", &IndexEntry{"job_summary", index}); err != nil {
			return fmt.Errorf("index update failed: %v", err)
		}
		if err := txn.Insert("job_summary", *existing); err != nil {
			return err
		}
	}

	return nil
}

// nestedUpdateAllocFromClient is used to nest an update of an allocation with client status
func (s *StateStore) nestedUpdateAllocFromClient(txn *memdb.Txn, watcher watch.Items, index uint64, alloc *structs.Allocation) error {
	// Look for existing alloc
	existing, err := txn.First("allocs", "id", alloc.ID)
	if err != nil {
		return fmt.Errorf("alloc lookup failed: %v", err)
	}

	// Nothing to do if this does not exist
	if existing == nil {
		return nil
	}
	exist := existing.(*structs.Allocation)
	// Trigger the watcher
	watcher.Add(watch.Item{Alloc: alloc.ID})
	watcher.Add(watch.Item{AllocEval: exist.EvalID})
	watcher.Add(watch.Item{AllocJob: exist.JobID})
	watcher.Add(watch.Item{AllocNode: exist.NodeID})

	// Copy everything from the existing allocation
	copyAlloc := new(structs.Allocation)
	*copyAlloc = *exist

	// Pull in anything the client is the authority on
	copyAlloc.ClientStatus = alloc.ClientStatus
	copyAlloc.ClientDescription = alloc.ClientDescription
	copyAlloc.TaskStates = alloc.TaskStates

	// Update the modify index
	copyAlloc.ModifyIndex = index

	if err := s.updateSummaryWithAlloc(index, copyAlloc, exist, watcher, txn); err != nil {
		return fmt.Errorf("error updating job summary: %v", err)
	}

	// Update the allocation
	if err := txn.Insert("allocs", copyAlloc); err != nil {
		return fmt.Errorf("alloc insert failed: %v", err)
	}

	// Set the job's status
	forceStatus := ""
	if !copyAlloc.TerminalStatus() {
		forceStatus = structs.JobStatusRunning
	}
	jobs := map[string]string{exist.JobID: forceStatus}
	if err := s.setJobStatuses(index, watcher, txn, jobs, false); err != nil {
		return fmt.Errorf("setting job status failed: %v", err)
	}
	return nil
}

// setJobStatus sets the status of the job by looking up associated evaluations
// and allocations. evalDelete should be set to true if setJobStatus is being
// called because an evaluation is being deleted (potentially because of garbage
// collection). If forceStatus is non-empty, the job's status will be set to the
// passed status.
func (s *StateStore) setJobStatus(index uint64, watcher watch.Items, txn *memdb.Txn,
	job *structs.Job, evalDelete bool, forceStatus string) error {

	// Capture the current status so we can check if there is a change
	oldStatus := job.Status
	newStatus := forceStatus

	// If forceStatus is not set, compute the jobs status.
	if forceStatus == "" {
		var err error
		newStatus, err = s.getJobStatus(txn, job, evalDelete)
		if err != nil {
			return err
		}
	}

	// Fast-path if nothing has changed.
	if oldStatus == newStatus {
		return nil
	}

	// The job has changed, so add to watcher.
	watcher.Add(watch.Item{Table: "jobs"})
	watcher.Add(watch.Item{Job: job.ID})

	// Copy and update the existing job
	updated := job.Copy()
	updated.Status = newStatus
	updated.ModifyIndex = index

	// Insert the job
	if err := txn.Insert("jobs", updated); err != nil {
		return fmt.Errorf("job insert failed: %v", err)
	}
	if err := txn.Insert("index", &IndexEntry{"jobs", index}); err != nil {
		return fmt.Errorf("index update failed: %v", err)
	}
	return nil
}

// updateSummaryWithAlloc updates the job summary when allocations are updated
// or inserted
func (s *StateStore) updateSummaryWithAlloc(index uint64, alloc *structs.Allocation,
	existingAlloc *structs.Allocation, watcher watch.Items, txn *memdb.Txn) error {

	// We don't have to update the summary if the job is missing
	if alloc.Job == nil {
		return nil
	}

	summaryRaw, err := txn.First("job_summary", "id", alloc.JobID)
	if err != nil {
		return fmt.Errorf("unable to lookup job summary for job id %q: %v", err)
	}
	if summaryRaw == nil {
		// Check if the job is de-registered
		rawJob, err := txn.First("jobs", "id", alloc.JobID)
		if err != nil {
			return fmt.Errorf("unable to query job: %v", err)
		}

		// If the job is de-registered then we skip updating it's summary
		if rawJob == nil {
			return nil
		}
		return fmt.Errorf("job summary for job %q is not present", alloc.JobID)
	}
	summary := summaryRaw.(structs.JobSummary)
	jobSummary := summary.Copy()

	// Not updating the job summary because the allocation doesn't belong to the
	// currently registered job
	if jobSummary.CreateIndex != alloc.Job.CreateIndex {
		return nil
	}

	tgSummary, ok := jobSummary.Summary[alloc.TaskGroup]
	if !ok {
		return fmt.Errorf("unable to find task group in the job summary: %v", alloc.TaskGroup)
	}
	var summaryChanged bool
	if existingAlloc == nil {
		switch alloc.DesiredStatus {
		case structs.AllocDesiredStatusStop, structs.AllocDesiredStatusEvict:
			s.logger.Printf("[ERR] state_store: new allocation inserted into state store with id: %v and state: %v",
				alloc.ID, alloc.DesiredStatus)
		}
		switch alloc.ClientStatus {
		case structs.AllocClientStatusPending:
			tgSummary.Starting += 1
			if tgSummary.Queued > 0 {
				tgSummary.Queued -= 1
			}
			summaryChanged = true
		case structs.AllocClientStatusRunning, structs.AllocClientStatusFailed,
			structs.AllocClientStatusComplete:
			s.logger.Printf("[ERR] state_store: new allocation inserted into state store with id: %v and state: %v",
				alloc.ID, alloc.ClientStatus)
		}
	} else if existingAlloc.ClientStatus != alloc.ClientStatus {
		// Incrementing the client of the bin of the current state
		switch alloc.ClientStatus {
		case structs.AllocClientStatusRunning:
			tgSummary.Running += 1
		case structs.AllocClientStatusFailed:
			tgSummary.Failed += 1
		case structs.AllocClientStatusPending:
			tgSummary.Starting += 1
		case structs.AllocClientStatusComplete:
			tgSummary.Complete += 1
		case structs.AllocClientStatusLost:
			tgSummary.Lost += 1
		}

		// Decrementing the count of the bin of the last state
		switch existingAlloc.ClientStatus {
		case structs.AllocClientStatusRunning:
			tgSummary.Running -= 1
		case structs.AllocClientStatusPending:
			tgSummary.Starting -= 1
		case structs.AllocClientStatusLost:
			tgSummary.Lost -= 1
		case structs.AllocClientStatusFailed, structs.AllocClientStatusComplete:
		default:
			s.logger.Printf("[ERR] state_store: invalid old state of allocation with id: %v, and state: %v",
				existingAlloc.ID, existingAlloc.ClientStatus)
		}
		summaryChanged = true
	}
	jobSummary.Summary[alloc.TaskGroup] = tgSummary

	if summaryChanged {
		jobSummary.ModifyIndex = index
		watcher.Add(watch.Item{Table: "job_summary"})
		watcher.Add(watch.Item{JobSummary: alloc.JobID})

		// Update the indexes table for job summary
		if err := txn.Insert("index", &IndexEntry{"job_summary", index}); err != nil {
			return fmt.Errorf("index update failed: %v", err)
		}
//.........这里部分代码省略.........