Golang watch.ResultChan函数代码示例

func newWatcher(kr *kregistry) (registry.Watcher, error) {
	svi := kr.client.Services(api.NamespaceAll)

	services, err := svi.List(labels.Everything(), fields.Everything())
	if err != nil {
		return nil, err
	}

	watch, err := svi.Watch(labels.Everything(), fields.Everything(), services.ResourceVersion)
	if err != nil {
		return nil, err
	}

	w := &watcher{
		registry: kr,
		watcher:  watch,
	}

	go func() {
		for event := range watch.ResultChan() {
			w.update(event)
		}
	}()

	return w, nil
}

//.........这里部分代码省略.........
			ErrFn: func(err error) bool {
				return apierrors.IsForbidden(err)
			},
		},
		{
			Request: &Request{
				content: ContentConfig{GroupVersion: testapi.Default.GroupVersion(), Codec: testapi.Default.Codec()},
				client: clientFunc(func(req *http.Request) (*http.Response, error) {
					return &http.Response{
						StatusCode: http.StatusUnauthorized,
						Body:       ioutil.NopCloser(bytes.NewReader([]byte{})),
					}, nil
				}),
				baseURL: &url.URL{},
			},
			Err: true,
			ErrFn: func(err error) bool {
				return apierrors.IsUnauthorized(err)
			},
		},
		{
			Request: &Request{
				content: ContentConfig{GroupVersion: testapi.Default.GroupVersion(), Codec: testapi.Default.Codec()},
				client: clientFunc(func(req *http.Request) (*http.Response, error) {
					return &http.Response{
						StatusCode: http.StatusUnauthorized,
						Body: ioutil.NopCloser(bytes.NewReader([]byte(runtime.EncodeOrDie(testapi.Default.Codec(), &unversioned.Status{
							Status: unversioned.StatusFailure,
							Reason: unversioned.StatusReasonUnauthorized,
						})))),
					}, nil
				}),
				baseURL: &url.URL{},
			},
			Err: true,
			ErrFn: func(err error) bool {
				return apierrors.IsUnauthorized(err)
			},
		},
		{
			Request: &Request{
				client: clientFunc(func(req *http.Request) (*http.Response, error) {
					return nil, io.EOF
				}),
				baseURL: &url.URL{},
			},
			Empty: true,
		},
		{
			Request: &Request{
				client: clientFunc(func(req *http.Request) (*http.Response, error) {
					return nil, &url.Error{Err: io.EOF}
				}),
				baseURL: &url.URL{},
			},
			Empty: true,
		},
		{
			Request: &Request{
				client: clientFunc(func(req *http.Request) (*http.Response, error) {
					return nil, errors.New("http: can't write HTTP request on broken connection")
				}),
				baseURL: &url.URL{},
			},
			Empty: true,
		},
		{
			Request: &Request{
				client: clientFunc(func(req *http.Request) (*http.Response, error) {
					return nil, errors.New("foo: connection reset by peer")
				}),
				baseURL: &url.URL{},
			},
			Empty: true,
		},
	}
	for i, testCase := range testCases {
		t.Logf("testcase %v", testCase.Request)
		testCase.Request.backoffMgr = &NoBackoff{}
		watch, err := testCase.Request.Watch()
		hasErr := err != nil
		if hasErr != testCase.Err {
			t.Errorf("%d: expected %t, got %t: %v", i, testCase.Err, hasErr, err)
			continue
		}
		if testCase.ErrFn != nil && !testCase.ErrFn(err) {
			t.Errorf("%d: error not valid: %v", i, err)
		}
		if hasErr && watch != nil {
			t.Errorf("%d: watch should be nil when error is returned", i)
			continue
		}
		if testCase.Empty {
			_, ok := <-watch.ResultChan()
			if ok {
				t.Errorf("%d: expected the watch to be empty: %#v", i, watch)
			}
		}
	}
}

func TestPersistentVolumeClaimBinder(t *testing.T) {
	_, s := runAMaster(t)
	defer s.Close()

	deleteAllEtcdKeys()
	binderClient := client.NewOrDie(&client.Config{Host: s.URL, Version: testapi.Default.Version()})
	testClient := client.NewOrDie(&client.Config{Host: s.URL, Version: testapi.Default.Version()})

	binder := volumeclaimbinder.NewPersistentVolumeClaimBinder(binderClient, 1*time.Second)
	binder.Run()
	defer binder.Stop()

	for _, volume := range createTestVolumes() {
		_, err := testClient.PersistentVolumes().Create(volume)
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}
	}

	volumes, err := testClient.PersistentVolumes().List(labels.Everything(), fields.Everything())
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if len(volumes.Items) != 2 {
		t.Errorf("expected 2 PVs, got %#v", len(volumes.Items))
	}

	for _, claim := range createTestClaims() {
		_, err := testClient.PersistentVolumeClaims(api.NamespaceDefault).Create(claim)
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}
	}

	claims, err := testClient.PersistentVolumeClaims(api.NamespaceDefault).List(labels.Everything(), fields.Everything())
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if len(claims.Items) != 3 {
		t.Errorf("expected 3 PVCs, got %#v", len(claims.Items))
	}

	// the binder will eventually catch up and set status on Claims
	watch, err := testClient.PersistentVolumeClaims(api.NamespaceDefault).Watch(labels.Everything(), fields.Everything(), "0")
	if err != nil {
		t.Fatalf("Couldn't subscribe to PersistentVolumeClaims: %v", err)
	}
	defer watch.Stop()

	// Wait for claim01 and claim02 to become bound
	claim01Pending := true
	claim02Pending := true
	for claim01Pending || claim02Pending {
		event := <-watch.ResultChan()
		claim := event.Object.(*api.PersistentVolumeClaim)
		if claim.Spec.VolumeName != "" && claim.Status.Phase != "Bound" {
			if claim.Name == "claim01" {
				claim01Pending = false
			} else if claim.Name == "claim02" {
				claim02Pending = false
			}
		}
	}

	for _, claim := range createTestClaims() {
		claim, err := testClient.PersistentVolumeClaims(api.NamespaceDefault).Get(claim.Name)
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}

		if (claim.Name == "claim01" || claim.Name == "claim02") && claim.Spec.VolumeName == "" {
			t.Errorf("Expected claim to be bound: %+v", claim)
		}
		if claim.Name == "claim03" && claim.Spec.VolumeName != "" {
			t.Errorf("Expected claim03 to be unbound: %v", claim)
		}
	}
}