mirror of
https://github.com/k3s-io/k3s.git
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119 lines
3.8 KiB
Go
119 lines
3.8 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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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/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/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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LabelSelector string
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FieldSelector string
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Export bool
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LimitChunks int64
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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, labelSelector, fieldSelector string, export bool, limitChunks int64) *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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LabelSelector: labelSelector,
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FieldSelector: fieldSelector,
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Export: export,
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LimitChunks: limitChunks,
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}
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}
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// Visit implements Visitor and uses request chunking by default.
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func (r *Selector) Visit(fn VisitorFunc) error {
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var continueToken string
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for {
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list, err := NewHelper(r.Client, r.Mapping).List(
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r.Namespace,
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r.ResourceMapping().GroupVersionKind.GroupVersion().String(),
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r.Export,
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&metav1.ListOptions{
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LabelSelector: r.LabelSelector,
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FieldSelector: r.FieldSelector,
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Limit: r.LimitChunks,
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Continue: continueToken,
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},
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)
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if err != nil {
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if errors.IsResourceExpired(err) {
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return err
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}
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if errors.IsBadRequest(err) || errors.IsNotFound(err) {
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if se, ok := err.(*errors.StatusError); ok {
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// modify the message without hiding this is an API error
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if len(r.LabelSelector) == 0 && len(r.FieldSelector) == 0 {
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se.ErrStatus.Message = fmt.Sprintf("Unable to list %q: %v", r.Mapping.Resource, se.ErrStatus.Message)
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} else {
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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)
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}
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return se
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}
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if len(r.LabelSelector) == 0 && len(r.FieldSelector) == 0 {
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return fmt.Errorf("Unable to list %q: %v", r.Mapping.Resource, err)
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}
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return fmt.Errorf("Unable to find %q that match label selector %q, field selector %q: %v", r.Mapping.Resource, r.LabelSelector, r.FieldSelector, err)
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}
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return err
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}
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resourceVersion, _ := metadataAccessor.ResourceVersion(list)
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nextContinueToken, _ := metadataAccessor.Continue(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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ResourceVersion: resourceVersion,
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Object: list,
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}
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if err := fn(info, nil); err != nil {
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return err
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}
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if len(nextContinueToken) == 0 {
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return nil
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}
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continueToken = nextContinueToken
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}
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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, r.ResourceMapping().GroupVersionKind.GroupVersion().String(),
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&metav1.ListOptions{ResourceVersion: resourceVersion, LabelSelector: r.LabelSelector, FieldSelector: r.FieldSelector})
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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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