Golang dynamic.Client類代碼示例

// listCollection will list the items in the specified namespace
// it returns the following:
//  the list of items in the collection (if found)
//  a boolean if the operation is supported
//  an error if the operation is supported but could not be completed.
func listCollection(
	dynamicClient *dynamic.Client,
	opCache operationNotSupportedCache,
	gvr unversioned.GroupVersionResource,
	namespace string,
) (*runtime.UnstructuredList, bool, error) {
	glog.V(5).Infof("namespace controller - listCollection - namespace: %s, gvr: %v", namespace, gvr)

	key := operationKey{op: operationList, gvr: gvr}
	if !opCache.isSupported(key) {
		glog.V(5).Infof("namespace controller - listCollection ignored since not supported - namespace: %s, gvr: %v", namespace, gvr)
		return nil, false, nil
	}

	apiResource := unversioned.APIResource{Name: gvr.Resource, Namespaced: true}
	unstructuredList, err := dynamicClient.Resource(&apiResource, namespace).List(v1.ListOptions{})
	if err == nil {
		return unstructuredList, true, nil
	}

	// this is strange, but we need to special case for both MethodNotSupported and NotFound errors
	// TODO: https://github.com/kubernetes/kubernetes/issues/22413
	// we have a resource returned in the discovery API that supports no top-level verbs:
	//  /apis/extensions/v1beta1/namespaces/default/replicationcontrollers
	// when working with this resource type, we will get a literal not found error rather than expected method not supported
	// remember next time that this resource does not support delete collection...
	if errors.IsMethodNotSupported(err) || errors.IsNotFound(err) {
		glog.V(5).Infof("namespace controller - listCollection not supported - namespace: %s, gvr: %v", namespace, gvr)
		opCache[key] = true
		return nil, false, nil
	}

	return nil, true, err
}

// TODO: make special List and Watch function that removes fields other than
// ObjectMeta.
func gcListWatcher(client *dynamic.Client, resource unversioned.GroupVersionResource) *cache.ListWatch {
	return &cache.ListWatch{
		ListFunc: func(options api.ListOptions) (runtime.Object, error) {
			// APIResource.Kind is not used by the dynamic client, so
			// leave it empty. We want to list this resource in all
			// namespaces if it's namespace scoped, so leave
			// APIResource.Namespaced as false is all right.
			apiResource := unversioned.APIResource{Name: resource.Resource}
			// The default parameter codec used by the dynamic client cannot
			// encode api.ListOptions.
			// TODO: api.ParameterCodec doesn't support thirdparty objects.
			// We need a generic parameter codec.
			return client.ParameterCodec(api.ParameterCodec).Resource(&apiResource, api.NamespaceAll).List(&options)
		},
		WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
			// APIResource.Kind is not used by the dynamic client, so
			// leave it empty. We want to list this resource in all
			// namespaces if it's namespace scoped, so leave
			// APIResource.Namespaced as false is all right.
			apiResource := unversioned.APIResource{Name: resource.Resource}
			// The default parameter codec used by the dynamic client cannot
			// encode api.ListOptions.
			return client.ParameterCodec(api.ParameterCodec).Resource(&apiResource, api.NamespaceAll).Watch(&options)
		},
	}
}

func (r *RegisteredRateLimiter) registerIfNotPresent(gv unversioned.GroupVersion, client *dynamic.Client, prefix string) {
	once, found := r.rateLimiters[gv]
	if !found {
		return
	}
	once.Do(func() {
		if rateLimiter := client.GetRateLimiter(); rateLimiter != nil {
			group := strings.Replace(gv.Group, ".", ":", -1)
			metrics.RegisterMetricAndTrackRateLimiterUsage(fmt.Sprintf("%s_%s_%s", prefix, group, gv.Version), rateLimiter)
		}
	})
}

func (r *RegisteredRateLimiter) registerIfNotPresent(gv unversioned.GroupVersion, client *dynamic.Client, prefix string) {
	r.lock.RLock()
	_, ok := r.rateLimiters[gv]
	r.lock.RUnlock()
	if ok {
		return
	}
	r.lock.Lock()
	defer r.lock.Unlock()
	if _, ok := r.rateLimiters[gv]; !ok {
		if rateLimiter := client.GetRateLimiter(); rateLimiter != nil {
			group := strings.Replace(gv.Group, ".", ":", -1)
			metrics.RegisterMetricAndTrackRateLimiterUsage(fmt.Sprintf("%s_%s_%s", prefix, group, gv.Version), rateLimiter)
		}
		r.rateLimiters[gv] = struct{}{}
	}
}

// deleteCollection is a helper function that will delete the collection of resources
// it returns true if the operation was supported on the server.
// it returns an error if the operation was supported on the server but was unable to complete.
func deleteCollection(
	dynamicClient *dynamic.Client,
	opCache operationNotSupportedCache,
	gvr unversioned.GroupVersionResource,
	namespace string,
) (bool, error) {
	glog.V(5).Infof("namespace controller - deleteCollection - namespace: %s, gvr: %v", namespace, gvr)

	key := operationKey{op: operationDeleteCollection, gvr: gvr}
	if !opCache.isSupported(key) {
		glog.V(5).Infof("namespace controller - deleteCollection ignored since not supported - namespace: %s, gvr: %v", namespace, gvr)
		return false, nil
	}

	apiResource := unversioned.APIResource{Name: gvr.Resource, Namespaced: true}

	// namespace controller does not want the garbage collector to insert the orphan finalizer since it calls
	// resource deletions generically.  it will ensure all resources in the namespace are purged prior to releasing
	// namespace itself.
	orphanDependents := false
	err := dynamicClient.Resource(&apiResource, namespace).DeleteCollection(&v1.DeleteOptions{OrphanDependents: &orphanDependents}, &v1.ListOptions{})

	if err == nil {
		return true, nil
	}

	// this is strange, but we need to special case for both MethodNotSupported and NotFound errors
	// TODO: https://github.com/kubernetes/kubernetes/issues/22413
	// we have a resource returned in the discovery API that supports no top-level verbs:
	//  /apis/extensions/v1beta1/namespaces/default/replicationcontrollers
	// when working with this resource type, we will get a literal not found error rather than expected method not supported
	// remember next time that this resource does not support delete collection...
	if errors.IsMethodNotSupported(err) || errors.IsNotFound(err) {
		glog.V(5).Infof("namespace controller - deleteCollection not supported - namespace: %s, gvr: %v", namespace, gvr)
		opCache[key] = true
		return false, nil
	}

	glog.V(5).Infof("namespace controller - deleteCollection unexpected error - namespace: %s, gvr: %v, error: %v", namespace, gvr, err)
	return true, err
}

// deleteEachItem is a helper function that will list the collection of resources and delete each item 1 by 1.
func deleteEachItem(
	dynamicClient *dynamic.Client,
	opCache operationNotSupportedCache,
	gvr unversioned.GroupVersionResource,
	namespace string,
) error {
	glog.V(5).Infof("namespace controller - deleteEachItem - namespace: %s, gvr: %v", namespace, gvr)

	unstructuredList, listSupported, err := listCollection(dynamicClient, opCache, gvr, namespace)
	if err != nil {
		return err
	}
	if !listSupported {
		return nil
	}
	apiResource := unversioned.APIResource{Name: gvr.Resource, Namespaced: true}
	for _, item := range unstructuredList.Items {
		if err = dynamicClient.Resource(&apiResource, namespace).Delete(item.Name, nil); err != nil && !errors.IsNotFound(err) && !errors.IsMethodNotSupported(err) {
			return err
		}
	}
	return nil
}

func gcListWatcher(client *dynamic.Client, resource unversioned.GroupVersionResource) *cache.ListWatch {
	return &cache.ListWatch{
		ListFunc: func(options api.ListOptions) (runtime.Object, error) {
			// APIResource.Kind is not used by the dynamic client, so
			// leave it empty. We want to list this resource in all
			// namespaces if it's namespace scoped, so leave
			// APIResource.Namespaced as false is all right.
			apiResource := unversioned.APIResource{Name: resource.Resource}
			return client.ParameterCodec(dynamic.VersionedParameterEncoderWithV1Fallback).
				Resource(&apiResource, api.NamespaceAll).
				List(&options)
		},
		WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
			// APIResource.Kind is not used by the dynamic client, so
			// leave it empty. We want to list this resource in all
			// namespaces if it's namespace scoped, so leave
			// APIResource.Namespaced as false is all right.
			apiResource := unversioned.APIResource{Name: resource.Resource}
			return client.ParameterCodec(dynamic.VersionedParameterEncoderWithV1Fallback).
				Resource(&apiResource, api.NamespaceAll).
				Watch(&options)
		},
	}
}