| /* |
| Copyright 2014 The Kubernetes Authors. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| package resource |
| |
| import ( |
| "fmt" |
| |
| "k8s.io/apimachinery/pkg/api/errors" |
| "k8s.io/apimachinery/pkg/api/meta" |
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| "k8s.io/apimachinery/pkg/watch" |
| ) |
| |
| // Selector is a Visitor for resources that match a label selector. |
| type Selector struct { |
| Client RESTClient |
| Mapping *meta.RESTMapping |
| Namespace string |
| LabelSelector string |
| FieldSelector string |
| Export bool |
| IncludeUninitialized bool |
| LimitChunks int64 |
| } |
| |
| // NewSelector creates a resource selector which hides details of getting items by their label selector. |
| func NewSelector(client RESTClient, mapping *meta.RESTMapping, namespace, labelSelector, fieldSelector string, export, includeUninitialized bool, limitChunks int64) *Selector { |
| return &Selector{ |
| Client: client, |
| Mapping: mapping, |
| Namespace: namespace, |
| LabelSelector: labelSelector, |
| FieldSelector: fieldSelector, |
| Export: export, |
| IncludeUninitialized: includeUninitialized, |
| LimitChunks: limitChunks, |
| } |
| } |
| |
| // Visit implements Visitor and uses request chunking by default. |
| func (r *Selector) Visit(fn VisitorFunc) error { |
| var continueToken string |
| for { |
| list, err := NewHelper(r.Client, r.Mapping).List( |
| r.Namespace, |
| r.ResourceMapping().GroupVersionKind.GroupVersion().String(), |
| r.Export, |
| &metav1.ListOptions{ |
| LabelSelector: r.LabelSelector, |
| FieldSelector: r.FieldSelector, |
| IncludeUninitialized: r.IncludeUninitialized, |
| Limit: r.LimitChunks, |
| Continue: continueToken, |
| }, |
| ) |
| if err != nil { |
| if errors.IsResourceExpired(err) { |
| return err |
| } |
| if errors.IsBadRequest(err) || errors.IsNotFound(err) { |
| if se, ok := err.(*errors.StatusError); ok { |
| // modify the message without hiding this is an API error |
| if len(r.LabelSelector) == 0 && len(r.FieldSelector) == 0 { |
| se.ErrStatus.Message = fmt.Sprintf("Unable to list %q: %v", r.Mapping.Resource, se.ErrStatus.Message) |
| } else { |
| se.ErrStatus.Message = fmt.Sprintf("Unable to find %q that match label selector %q, field selector %q: %v", r.Mapping.Resource, r.LabelSelector, r.FieldSelector, se.ErrStatus.Message) |
| } |
| return se |
| } |
| if len(r.LabelSelector) == 0 && len(r.FieldSelector) == 0 { |
| return fmt.Errorf("Unable to list %q: %v", r.Mapping.Resource, err) |
| } |
| return fmt.Errorf("Unable to find %q that match label selector %q, field selector %q: %v", r.Mapping.Resource, r.LabelSelector, r.FieldSelector, err) |
| } |
| return err |
| } |
| resourceVersion, _ := metadataAccessor.ResourceVersion(list) |
| nextContinueToken, _ := metadataAccessor.Continue(list) |
| info := &Info{ |
| Client: r.Client, |
| Mapping: r.Mapping, |
| |
| Namespace: r.Namespace, |
| ResourceVersion: resourceVersion, |
| |
| Object: list, |
| } |
| |
| if err := fn(info, nil); err != nil { |
| return err |
| } |
| if len(nextContinueToken) == 0 { |
| return nil |
| } |
| continueToken = nextContinueToken |
| } |
| } |
| |
| func (r *Selector) Watch(resourceVersion string) (watch.Interface, error) { |
| return NewHelper(r.Client, r.Mapping).Watch(r.Namespace, r.ResourceMapping().GroupVersionKind.GroupVersion().String(), |
| &metav1.ListOptions{ResourceVersion: resourceVersion, LabelSelector: r.LabelSelector, FieldSelector: r.FieldSelector}) |
| } |
| |
| // ResourceMapping returns the mapping for this resource and implements ResourceMapping |
| func (r *Selector) ResourceMapping() *meta.RESTMapping { |
| return r.Mapping |
| } |