Golang metrics.SinceInMicroseconds函数代码示例

// relist queries the container runtime for list of pods/containers, compare
// with the internal pods/containers, and generats events accordingly.
func (g *GenericPLEG) relist() {
	glog.V(5).Infof("GenericPLEG: Relisting")
	timestamp := time.Now()

	if !g.lastRelistTime.IsZero() {
		metrics.PLEGRelistInterval.Observe(metrics.SinceInMicroseconds(g.lastRelistTime))
	}
	defer func() {
		// Update the relist time.
		g.lastRelistTime = timestamp
		metrics.PLEGRelistLatency.Observe(metrics.SinceInMicroseconds(timestamp))
	}()

	// Get all the pods.
	pods, err := g.runtime.GetPods(true)
	if err != nil {
		glog.Errorf("GenericPLEG: Unable to retrieve pods: %v", err)
		return
	}

	events := []*PodLifecycleEvent{}
	containers := make(map[string]containerInfo, len(g.containers))
	// Create a new containers map, compares container statuses, and generates
	// correspoinding events.
	for _, p := range pods {
		for _, c := range p.Containers {
			cid := c.ID.ID
			// Get the of existing container info. Defaults to state unknown.
			oldState := kubecontainer.ContainerStateUnknown
			if info, ok := g.containers[cid]; ok {
				oldState = info.state
			}
			// Generate an event if required.
			glog.V(7).Infof("GenericPLEG: %v/%v: %v -> %v", p.ID, cid, oldState, c.State)
			if e := generateEvent(p.ID, cid, oldState, c.State); e != nil {
				events = append(events, e)
			}
			// Write to the new cache.
			containers[cid] = containerInfo{podID: p.ID, state: c.State}
		}
	}

	// Swap the container info cache. This is purely to avoid the need of
	// garbage collection.
	g.containers = containers

	// Send out the events.
	for i := range events {
		g.eventChannel <- events[i]
	}
}

// Start eager background caching of volume stats.
func (s *fsResourceAnalyzer) Start() {
	if s.calcVolumePeriod <= 0 {
		glog.Info("Volume stats collection disabled.")
		return
	}
	glog.Info("Starting FS ResourceAnalyzer")
	go wait.Forever(func() {
		startTime := time.Now()
		s.updateCachedPodVolumeStats()
		glog.V(3).Infof("Finished calculating volume stats in %v.", time.Now().Sub(startTime))
		metrics.MetricsVolumeCalcLatency.Observe(metrics.SinceInMicroseconds(startTime))
	}, s.calcVolumePeriod)
}

// recordOperation records the duration of the operation.
func recordOperation(operation string, start time.Time) {
	metrics.DockerOperations.WithLabelValues(operation).Inc()
	metrics.DockerOperationsLatency.WithLabelValues(operation).Observe(metrics.SinceInMicroseconds(start))
}

// relist queries the container runtime for list of pods/containers, compare
// with the internal pods/containers, and generats events accordingly.
func (g *GenericPLEG) relist() {
	glog.V(5).Infof("GenericPLEG: Relisting")
	timestamp := time.Now()

	if !g.lastRelistTime.IsZero() {
		metrics.PLEGRelistInterval.Observe(metrics.SinceInMicroseconds(g.lastRelistTime))
	}
	defer func() {
		// Update the relist time.
		g.lastRelistTime = timestamp
		metrics.PLEGRelistLatency.Observe(metrics.SinceInMicroseconds(timestamp))
	}()

	// Get all the pods.
	podList, err := g.runtime.GetPods(true)
	if err != nil {
		glog.Errorf("GenericPLEG: Unable to retrieve pods: %v", err)
		return
	}
	pods := kubecontainer.Pods(podList)
	g.podRecords.setCurrent(pods)

	// Compare the old and the current pods, and generate events.
	eventsByPodID := map[types.UID][]*PodLifecycleEvent{}
	for pid := range g.podRecords {
		oldPod := g.podRecords.getOld(pid)
		pod := g.podRecords.getCurrent(pid)
		// Get all containers in the old and the new pod.
		allContainers := getContainersFromPods(oldPod, pod)
		for _, container := range allContainers {
			e := computeEvent(oldPod, pod, &container.ID)
			updateEvents(eventsByPodID, e)
		}
	}

	// If there are events associated with a pod, we should update the
	// podCache.
	for pid, events := range eventsByPodID {
		pod := g.podRecords.getCurrent(pid)
		if g.cacheEnabled() {
			// updateCache() will inspect the pod and update the cache. If an
			// error occurs during the inspection, we want PLEG to retry again
			// in the next relist. To achieve this, we do not update the
			// associated podRecord of the pod, so that the change will be
			// detect again in the next relist.
			// TODO: If many pods changed during the same relist period,
			// inspecting the pod and getting the PodStatus to update the cache
			// serially may take a while. We should be aware of this and
			// parallelize if needed.
			if err := g.updateCache(pod, pid); err != nil {
				glog.Errorf("PLEG: Ignoring events for pod %s/%s: %v", pod.Name, pod.Namespace, err)
				continue
			}
		}
		// Update the internal storage and send out the events.
		g.podRecords.update(pid)
		for i := range events {
			// Filter out events that are not reliable and no other components use yet.
			if events[i].Type == ContainerChanged || events[i].Type == ContainerRemoved {
				continue
			}
			g.eventChannel <- events[i]
		}
	}

	if g.cacheEnabled() {
		// Update the cache timestamp.  This needs to happen *after*
		// all pods have been properly updated in the cache.
		g.cache.UpdateTime(timestamp)
	}
}

// relist queries the container runtime for list of pods/containers, compare
// with the internal pods/containers, and generats events accordingly.
func (g *GenericPLEG) relist() {
	glog.V(5).Infof("GenericPLEG: Relisting")

	if lastRelistTime := g.getRelistTime(); !lastRelistTime.IsZero() {
		metrics.PLEGRelistInterval.Observe(metrics.SinceInMicroseconds(lastRelistTime))
	}

	timestamp := g.clock.Now()
	// Update the relist time.
	g.updateRelisTime(timestamp)
	defer func() {
		metrics.PLEGRelistLatency.Observe(metrics.SinceInMicroseconds(timestamp))
	}()

	// Get all the pods.
	podList, err := g.runtime.GetPods(true)
	if err != nil {
		glog.Errorf("GenericPLEG: Unable to retrieve pods: %v", err)
		return
	}
	pods := kubecontainer.Pods(podList)
	g.podRecords.setCurrent(pods)

	// Compare the old and the current pods, and generate events.
	eventsByPodID := map[types.UID][]*PodLifecycleEvent{}
	for pid := range g.podRecords {
		oldPod := g.podRecords.getOld(pid)
		pod := g.podRecords.getCurrent(pid)
		// Get all containers in the old and the new pod.
		allContainers := getContainersFromPods(oldPod, pod)
		for _, container := range allContainers {
			events := computeEvents(oldPod, pod, &container.ID)
			for _, e := range events {
				updateEvents(eventsByPodID, e)
			}
		}
	}

	var needsReinspection map[types.UID]*kubecontainer.Pod
	if g.cacheEnabled() {
		needsReinspection = make(map[types.UID]*kubecontainer.Pod)
	}

	// If there are events associated with a pod, we should update the
	// podCache.
	for pid, events := range eventsByPodID {
		pod := g.podRecords.getCurrent(pid)
		if g.cacheEnabled() {
			// updateCache() will inspect the pod and update the cache. If an
			// error occurs during the inspection, we want PLEG to retry again
			// in the next relist. To achieve this, we do not update the
			// associated podRecord of the pod, so that the change will be
			// detect again in the next relist.
			// TODO: If many pods changed during the same relist period,
			// inspecting the pod and getting the PodStatus to update the cache
			// serially may take a while. We should be aware of this and
			// parallelize if needed.
			if err := g.updateCache(pod, pid); err != nil {
				glog.Errorf("PLEG: Ignoring events for pod %s/%s: %v", pod.Name, pod.Namespace, err)

				// make sure we try to reinspect the pod during the next relisting
				needsReinspection[pid] = pod

				continue
			} else if _, found := g.podsToReinspect[pid]; found {
				// this pod was in the list to reinspect and we did so because it had events, so remove it
				// from the list (we don't want the reinspection code below to inspect it a second time in
				// this relist execution)
				delete(g.podsToReinspect, pid)
			}
		}
		// Update the internal storage and send out the events.
		g.podRecords.update(pid)
		for i := range events {
			// Filter out events that are not reliable and no other components use yet.
			if events[i].Type == ContainerChanged {
				continue
			}
			g.eventChannel <- events[i]
		}
	}

	if g.cacheEnabled() {
		// reinspect any pods that failed inspection during the previous relist
		if len(g.podsToReinspect) > 0 {
			glog.V(5).Infof("GenericPLEG: Reinspecting pods that previously failed inspection")
			for pid, pod := range g.podsToReinspect {
				if err := g.updateCache(pod, pid); err != nil {
					glog.Errorf("PLEG: pod %s/%s failed reinspection: %v", pod.Name, pod.Namespace, err)
					needsReinspection[pid] = pod
				}
			}
		}

		// Update the cache timestamp.  This needs to happen *after*
		// all pods have been properly updated in the cache.
		g.cache.UpdateTime(timestamp)
	}
//.........这里部分代码省略.........