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80 lines
2.4 KiB
Go
80 lines
2.4 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package resource
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import (
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"fmt"
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"k8s.io/kubernetes/pkg/api/errors"
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"k8s.io/kubernetes/pkg/api/meta"
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"k8s.io/kubernetes/pkg/labels"
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"k8s.io/kubernetes/pkg/watch"
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)
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// Selector is a Visitor for resources that match a label selector.
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type Selector struct {
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Client RESTClient
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Mapping *meta.RESTMapping
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Namespace string
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Selector labels.Selector
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}
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// NewSelector creates a resource selector which hides details of getting items by their label selector.
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func NewSelector(client RESTClient, mapping *meta.RESTMapping, namespace string, selector labels.Selector) *Selector {
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return &Selector{
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Client: client,
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Mapping: mapping,
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Namespace: namespace,
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Selector: selector,
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}
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}
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// Visit implements Visitor
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func (r *Selector) Visit(fn VisitorFunc) error {
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list, err := NewHelper(r.Client, r.Mapping).List(r.Namespace, r.ResourceMapping().APIVersion, r.Selector)
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if err != nil {
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if errors.IsBadRequest(err) || errors.IsNotFound(err) {
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if r.Selector.Empty() {
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return fmt.Errorf("Unable to list %q: %v", r.Mapping.Resource, err)
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} else {
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return fmt.Errorf("Unable to find %q that match the selector %q: %v", r.Mapping.Resource, r.Selector, err)
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}
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}
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return err
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}
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accessor := r.Mapping.MetadataAccessor
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resourceVersion, _ := accessor.ResourceVersion(list)
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info := &Info{
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Client: r.Client,
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Mapping: r.Mapping,
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Namespace: r.Namespace,
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Object: list,
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ResourceVersion: resourceVersion,
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}
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return fn(info, nil)
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}
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func (r *Selector) Watch(resourceVersion string) (watch.Interface, error) {
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return NewHelper(r.Client, r.Mapping).Watch(r.Namespace, resourceVersion, r.ResourceMapping().APIVersion, r.Selector)
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}
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// ResourceMapping returns the mapping for this resource and implements ResourceMapping
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func (r *Selector) ResourceMapping() *meta.RESTMapping {
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return r.Mapping
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}
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