Golang T.hash方法代码示例

func TestScrapePoolStop(t *testing.T) {
	sp := &scrapePool{
		targets: map[uint64]*Target{},
		loops:   map[uint64]loop{},
	}
	var mtx sync.Mutex
	stopped := map[uint64]bool{}
	numTargets := 20

	// Stopping the scrape pool must call stop() on all scrape loops,
	// clean them and the respective targets up. It must wait until each loop's
	// stop function returned before returning itself.

	for i := 0; i < numTargets; i++ {
		t := &Target{
			labels: model.LabelSet{
				model.AddressLabel: model.LabelValue(fmt.Sprintf("example.com:%d", i)),
			},
		}
		l := &testLoop{}
		l.stopFunc = func() {
			time.Sleep(time.Duration(i*20) * time.Millisecond)

			mtx.Lock()
			stopped[t.hash()] = true
			mtx.Unlock()
		}

		sp.targets[t.hash()] = t
		sp.loops[t.hash()] = l
	}

	done := make(chan struct{})
	stopTime := time.Now()

	go func() {
		sp.stop()
		close(done)
	}()

	select {
	case <-time.After(5 * time.Second):
		t.Fatalf("scrapeLoop.stop() did not return as expected")
	case <-done:
		// This should have taken at least as long as the last target slept.
		if time.Since(stopTime) < time.Duration(numTargets*20)*time.Millisecond {
			t.Fatalf("scrapeLoop.stop() exited before all targets stopped")
		}
	}

	mtx.Lock()
	if len(stopped) != numTargets {
		t.Fatalf("Expected 20 stopped loops, got %d", len(stopped))
	}
	mtx.Unlock()

	if len(sp.targets) > 0 {
		t.Fatalf("Targets were not cleared on stopping: %d left", len(sp.targets))
	}
	if len(sp.loops) > 0 {
		t.Fatalf("Loops were not cleared on stopping: %d left", len(sp.loops))
	}
}

func TestScrapePoolReload(t *testing.T) {
	var mtx sync.Mutex
	numTargets := 20

	stopped := map[uint64]bool{}

	reloadCfg := &config.ScrapeConfig{
		ScrapeInterval: model.Duration(3 * time.Second),
		ScrapeTimeout:  model.Duration(2 * time.Second),
	}
	// On starting to run, new loops created on reload check whether their preceeding
	// equivalents have been stopped.
	newLoop := func(ctx context.Context, s scraper, app, reportApp storage.SampleAppender) loop {
		l := &testLoop{}
		l.startFunc = func(interval, timeout time.Duration, errc chan<- error) {
			if interval != 3*time.Second {
				t.Errorf("Expected scrape interval %d but got %d", 3*time.Second, interval)
			}
			if timeout != 2*time.Second {
				t.Errorf("Expected scrape timeout %d but got %d", 2*time.Second, timeout)
			}
			mtx.Lock()
			if !stopped[s.(*targetScraper).hash()] {
				t.Errorf("Scrape loop for %v not stopped yet", s.(*targetScraper))
			}
			mtx.Unlock()
		}
		return l
	}
	sp := &scrapePool{
		targets: map[uint64]*Target{},
		loops:   map[uint64]loop{},
		newLoop: newLoop,
	}

	// Reloading a scrape pool with a new scrape configuration must stop all scrape
	// loops and start new ones. A new loop must not be started before the preceeding
	// one terminated.

	for i := 0; i < numTargets; i++ {
		t := &Target{
			labels: model.LabelSet{
				model.AddressLabel: model.LabelValue(fmt.Sprintf("example.com:%d", i)),
			},
		}
		l := &testLoop{}
		l.stopFunc = func() {
			time.Sleep(time.Duration(i*20) * time.Millisecond)

			mtx.Lock()
			stopped[t.hash()] = true
			mtx.Unlock()
		}

		sp.targets[t.hash()] = t
		sp.loops[t.hash()] = l
	}
	done := make(chan struct{})

	beforeTargets := map[uint64]*Target{}
	for h, t := range sp.targets {
		beforeTargets[h] = t
	}

	reloadTime := time.Now()

	go func() {
		sp.reload(reloadCfg)
		close(done)
	}()

	select {
	case <-time.After(5 * time.Second):
		t.Fatalf("scrapeLoop.reload() did not return as expected")
	case <-done:
		// This should have taken at least as long as the last target slept.
		if time.Since(reloadTime) < time.Duration(numTargets*20)*time.Millisecond {
			t.Fatalf("scrapeLoop.stop() exited before all targets stopped")
		}
	}

	mtx.Lock()
	if len(stopped) != numTargets {
		t.Fatalf("Expected 20 stopped loops, got %d", len(stopped))
	}
	mtx.Unlock()

	if !reflect.DeepEqual(sp.targets, beforeTargets) {
		t.Fatalf("Reloading affected target states unexpectedly")
	}
	if len(sp.loops) != numTargets {
		t.Fatalf("Expected %d loops after reload but got %d", numTargets, len(sp.loops))
	}
}