Golang metrics.InMicroseconds函數代碼示例

func (t *T) Set(f FlagType) {
	t.Flags[f] = struct{}{}
	if Launched == f {
		t.launchTime = time.Now()
		queueWaitTime := t.launchTime.Sub(t.CreateTime)
		metrics.QueueWaitTime.Observe(metrics.InMicroseconds(queueWaitTime))
	}
}

func (k *inMemoryRegistry) handleTaskStarting(task *T, state StateType, status *mesos.TaskStatus) {
	// we expect to receive this when a launched task is finally "bound"
	// via the API server. however, there's nothing specific for us to do here.
	switch state {
	case StatePending:
		task.UpdatedTime = time.Now()
		if !task.Has(Bound) {
			task.Set(Bound)
			task.bindTime = task.UpdatedTime
			timeToBind := task.bindTime.Sub(task.launchTime)
			metrics.BindLatency.Observe(metrics.InMicroseconds(timeToBind))
		}
	default:
		taskId := status.GetTaskId().GetValue()
		log.Warningf("Ignore status TASK_STARTING because the task %v is not pending", taskId)
	}
}

// execute task reconciliation, returns when r.done is closed. intended to run as a goroutine.
// if reconciliation is requested while another is in progress, the in-progress operation will be
// cancelled before the new reconciliation operation begins.
func (r *Reconciler) Run(driver bindings.SchedulerDriver) {
	var cancel, finished chan struct{}
requestLoop:
	for {
		select {
		case <-r.done:
			return
		default: // proceed
		}
		select {
		case <-r.implicit:
			metrics.ReconciliationRequested.WithLabelValues("implicit").Inc()
			select {
			case <-r.done:
				return
			case <-r.explicit:
				break // give preference to a pending request for explicit
			default: // continue
				// don't run implicit reconciliation while explicit is ongoing
				if finished != nil {
					select {
					case <-finished: // continue w/ implicit
					default:
						log.Infoln("skipping implicit reconcile because explicit reconcile is ongoing")
						continue requestLoop
					}
				}
				errOnce := proc.NewErrorOnce(r.done)
				errCh := r.Do(func() {
					var err error
					defer errOnce.Report(err)
					log.Infoln("implicit reconcile tasks")
					metrics.ReconciliationExecuted.WithLabelValues("implicit").Inc()
					if _, err = driver.ReconcileTasks([]*mesos.TaskStatus{}); err != nil {
						log.V(1).Infof("failed to request implicit reconciliation from mesos: %v", err)
					}
				})
				proc.OnError(errOnce.Send(errCh).Err(), func(err error) {
					log.Errorf("failed to run implicit reconciliation: %v", err)
				}, r.done)
				goto slowdown
			}
		case <-r.done:
			return
		case <-r.explicit: // continue
			metrics.ReconciliationRequested.WithLabelValues("explicit").Inc()
		}

		if cancel != nil {
			close(cancel)
			cancel = nil

			// play nice and wait for the prior operation to finish, complain
			// if it doesn't
			select {
			case <-r.done:
				return
			case <-finished: // noop, expected
			case <-time.After(r.explicitReconciliationAbortTimeout): // very unexpected
				log.Error("reconciler action failed to stop upon cancellation")
			}
		}
		// copy 'finished' to 'fin' here in case we end up with simultaneous go-routines,
		// if cancellation takes too long or fails - we don't want to close the same chan
		// more than once
		cancel = make(chan struct{})
		finished = make(chan struct{})
		go func(fin chan struct{}) {
			startedAt := time.Now()
			defer func() {
				metrics.ReconciliationLatency.Observe(metrics.InMicroseconds(time.Since(startedAt)))
			}()

			metrics.ReconciliationExecuted.WithLabelValues("explicit").Inc()
			defer close(fin)
			err := <-r.Action(driver, cancel)
			if err == reconciliationCancelledErr {
				metrics.ReconciliationCancelled.WithLabelValues("explicit").Inc()
				log.Infoln(err.Error())
			} else if err != nil {
				log.Errorf("reconciler action failed: %v", err)
			}
		}(finished)
	slowdown:
		// don't allow reconciliation to run very frequently, either explicit or implicit
		select {
		case <-r.done:
			return
		case <-time.After(r.cooldown): // noop
		}
	} // for
}