Golang ReplicationController.Annotations方法代码示例

// getOrCreateTargetControllerWithClient looks for an existing controller with
// sourceId. If found, the existing controller is returned with true
// indicating that the controller already exists. If the controller isn't
// found, a new one is created and returned along with false indicating the
// controller was created.
//
// Existing controllers are validated to ensure their sourceIdAnnotation
// matches sourceId; if there's a mismatch, an error is returned.
func (r *RollingUpdater) getOrCreateTargetControllerWithClient(controller *api.ReplicationController, sourceId string) (*api.ReplicationController, bool, error) {
	existingRc, err := r.existingController(controller)
	if err != nil {
		if !errors.IsNotFound(err) {
			// There was an error trying to find the controller; don't assume we
			// should create it.
			return nil, false, err
		}
		if controller.Spec.Replicas <= 0 {
			return nil, false, fmt.Errorf("Invalid controller spec for %s; required: > 0 replicas, actual: %d\n", controller.Name, controller.Spec)
		}
		// The controller wasn't found, so create it.
		if controller.Annotations == nil {
			controller.Annotations = map[string]string{}
		}
		controller.Annotations[desiredReplicasAnnotation] = fmt.Sprintf("%d", controller.Spec.Replicas)
		controller.Annotations[sourceIdAnnotation] = sourceId
		controller.Spec.Replicas = 0
		newRc, err := r.c.ReplicationControllers(r.ns).Create(controller)
		return newRc, false, err
	}
	// Validate and use the existing controller.
	annotations := existingRc.Annotations
	source := annotations[sourceIdAnnotation]
	_, ok := annotations[desiredReplicasAnnotation]
	if source != sourceId || !ok {
		return nil, false, fmt.Errorf("Missing/unexpected annotations for controller %s, expected %s : %s", controller.Name, sourceId, annotations)
	}
	return existingRc, true, nil
}

func (dc *DeploymentController) updateRCRevision(rc api.ReplicationController, revision string) error {
	if rc.Annotations == nil {
		rc.Annotations = make(map[string]string)
	}
	rc.Annotations[deploymentutil.RevisionAnnotation] = revision
	_, err := dc.client.Legacy().ReplicationControllers(rc.ObjectMeta.Namespace).Update(&rc)
	return err
}

// setNewRCAnnotations sets new rc's annotations appropriately by updating its revision and
// copying required deployment annotations to it; it returns true if rc's annotation is changed.
func setNewRCAnnotations(deployment *extensions.Deployment, rc *api.ReplicationController, newRevision string) bool {
	// First, copy deployment's annotations
	annotationChanged := copyDeploymentAnnotationsToRC(deployment, rc)
	// Then, update RC's revision annotation
	if rc.Annotations == nil {
		rc.Annotations = make(map[string]string)
	}
	if rc.Annotations[deploymentutil.RevisionAnnotation] != newRevision {
		rc.Annotations[deploymentutil.RevisionAnnotation] = newRevision
		annotationChanged = true
		glog.V(4).Infof("updating RC %q's revision to %s - %+v\n", rc.Name, newRevision)
	}
	return annotationChanged
}

// copyDeploymentAnnotationsToRC copies deployment's annotations to rc's annotations,
// and returns true if rc's annotation is changed
func copyDeploymentAnnotationsToRC(deployment *extensions.Deployment, rc *api.ReplicationController) bool {
	rcAnnotationsChanged := false
	if rc.Annotations == nil {
		rc.Annotations = make(map[string]string)
	}
	for k, v := range deployment.Annotations {
		// Skip apply annotations
		// TODO: How to decide which annotations should / should not be copied?
		// See https://github.com/kubernetes/kubernetes/pull/20035#issuecomment-179558615
		if k == kubectl.LastAppliedConfigAnnotation || rc.Annotations[k] == v {
			continue
		}
		rc.Annotations[k] = v
		rcAnnotationsChanged = true
	}
	return rcAnnotationsChanged
}

func SetNextControllerAnnotation(rc *api.ReplicationController, name string) {
	if rc.Annotations == nil {
		rc.Annotations = map[string]string{}
	}
	rc.Annotations[nextControllerAnnotation] = name
}

// Handle processes deployment and either creates a deployer pod or responds
// to a terminal deployment status. Since this controller started using caches,
// the provided rc MUST be deep-copied beforehand (see work() in factory.go).
func (c *DeploymentController) Handle(deployment *kapi.ReplicationController) error {
	// Copy all the annotations from the deployment.
	updatedAnnotations := make(map[string]string)
	for key, value := range deployment.Annotations {
		updatedAnnotations[key] = value
	}

	currentStatus := deployutil.DeploymentStatusFor(deployment)
	nextStatus := currentStatus

	deployerPodName := deployutil.DeployerPodNameForDeployment(deployment.Name)
	deployer, deployerErr := c.getPod(deployment.Namespace, deployerPodName)
	if deployerErr == nil {
		nextStatus = c.nextStatus(deployer, deployment, updatedAnnotations)
	}

	switch currentStatus {
	case deployapi.DeploymentStatusNew:
		// If the deployment has been cancelled, don't create a deployer pod.
		// Instead try to delete any deployer pods found and transition the
		// deployment to Pending so that the deployment config controller
		// continues to see the deployment as in-flight. Eventually the deletion
		// of the deployer pod should cause a requeue of this deployment and
		// then it can be transitioned to Failed by this controller.
		if deployutil.IsDeploymentCancelled(deployment) {
			nextStatus = deployapi.DeploymentStatusPending
			if err := c.cleanupDeployerPods(deployment); err != nil {
				return err
			}
			break
		}

		// If the pod already exists, it's possible that a previous CreatePod
		// succeeded but the deployment state update failed and now we're re-
		// entering. Ensure that the pod is the one we created by verifying the
		// annotation on it, and throw a retryable error.
		if deployerErr != nil && !kerrors.IsNotFound(deployerErr) {
			return fmt.Errorf("couldn't fetch existing deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), deployerErr)
		}
		if deployerErr == nil && deployer != nil {
			// Do a stronger check to validate that the existing deployer pod is
			// actually for this deployment, and if not, fail this deployment.
			//
			// TODO: Investigate checking the container image of the running pod and
			// comparing with the intended deployer pod image. If we do so, we'll need
			// to ensure that changes to 'unrelated' pods don't result in updates to
			// the deployment. So, the image check will have to be done in other areas
			// of the code as well.
			if deployutil.DeploymentNameFor(deployer) != deployment.Name {
				nextStatus = deployapi.DeploymentStatusFailed
				updatedAnnotations[deployapi.DeploymentStatusReasonAnnotation] = deployapi.DeploymentFailedUnrelatedDeploymentExists
				c.emitDeploymentEvent(deployment, kapi.EventTypeWarning, "FailedCreate", fmt.Sprintf("Error creating deployer pod since another pod with the same name (%q) exists", deployer.Name))
				glog.V(2).Infof("Couldn't create deployer pod for %s since an unrelated pod with the same name (%q) exists", deployutil.LabelForDeployment(deployment), deployer.Name)
			} else {
				// Update to pending or to the appropriate status relative to the existing validated deployer pod.
				updatedAnnotations[deployapi.DeploymentPodAnnotation] = deployer.Name
				nextStatus = nextStatusComp(nextStatus, deployapi.DeploymentStatusPending)
				glog.V(4).Infof("Detected existing deployer pod %s for deployment %s", deployer.Name, deployutil.LabelForDeployment(deployment))
			}
			// Don't try and re-create the deployer pod.
			break
		}

		if _, ok := deployment.Annotations[deployapi.DeploymentIgnorePodAnnotation]; ok {
			return nil
		}

		// Generate a deployer pod spec.
		deployerPod, err := c.makeDeployerPod(deployment)
		if err != nil {
			return fatalError(fmt.Sprintf("couldn't make deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), err))
		}
		// Create the deployer pod.
		deploymentPod, err := c.pn.Pods(deployment.Namespace).Create(deployerPod)
		// Retry on error.
		if err != nil {
			return actionableError(fmt.Sprintf("couldn't create deployer pod for %s: %v", deployutil.LabelForDeployment(deployment), err))
		}
		updatedAnnotations[deployapi.DeploymentPodAnnotation] = deploymentPod.Name
		nextStatus = deployapi.DeploymentStatusPending
		glog.V(4).Infof("Created deployer pod %s for deployment %s", deploymentPod.Name, deployutil.LabelForDeployment(deployment))

	case deployapi.DeploymentStatusPending, deployapi.DeploymentStatusRunning:
		switch {
		case kerrors.IsNotFound(deployerErr):
			nextStatus = deployapi.DeploymentStatusFailed
			// If the deployment is cancelled here then we deleted the deployer in a previous
			// resync of the deployment.
			if !deployutil.IsDeploymentCancelled(deployment) {
				updatedAnnotations[deployapi.DeploymentStatusReasonAnnotation] = deployapi.DeploymentFailedDeployerPodNoLongerExists
				c.emitDeploymentEvent(deployment, kapi.EventTypeWarning, "Failed", fmt.Sprintf("Deployer pod %q has gone missing", deployerPodName))
				deployerErr = fmt.Errorf("Failing deployment %q because its deployer pod %q disappeared", deployutil.LabelForDeployment(deployment), deployerPodName)
				utilruntime.HandleError(deployerErr)
			}

		case deployerErr != nil:
			// We'll try again later on resync. Continue to process cancellations.
//.........这里部分代码省略.........