kubernetes selector 源码
kubernetes selector 代码
文件路径：/staging/src/k8s.io/cli-runtime/pkg/resource/selector.go
/*
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 (
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"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
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, limitChunks int64) *Selector {
return &Selector{
Client: client,
Mapping: mapping,
Namespace: namespace,
LabelSelector: labelSelector,
FieldSelector: fieldSelector,
LimitChunks: limitChunks,
}
}
// Visit implements Visitor and uses request chunking by default.
func (r *Selector) Visit(fn VisitorFunc) error {
helper := NewHelper(r.Client, r.Mapping)
initialOpts := metav1.ListOptions{
LabelSelector: r.LabelSelector,
FieldSelector: r.FieldSelector,
Limit: r.LimitChunks,
}
return FollowContinue(&initialOpts, func(options metav1.ListOptions) (runtime.Object, error) {
list, err := helper.List(
r.Namespace,
r.ResourceMapping().GroupVersionKind.GroupVersion().String(),
&options,
)
if err != nil {
return nil, EnhanceListError(err, options, r.Mapping.Resource.String())
}
resourceVersion, _ := metadataAccessor.ResourceVersion(list)
info := &Info{
Client: r.Client,
Mapping: r.Mapping,
Namespace: r.Namespace,
ResourceVersion: resourceVersion,
Object: list,
}
if err := fn(info, nil); err != nil {
return nil, err
}
return list, nil
})
}
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
}
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