mirror of https://github.com/docker/cli.git
98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
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/*
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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 meta
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import (
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"fmt"
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"k8s.io/apimachinery/pkg/runtime/schema"
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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)
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// FirstHitRESTMapper is a wrapper for multiple RESTMappers which returns the
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// first successful result for the singular requests
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type FirstHitRESTMapper struct {
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MultiRESTMapper
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}
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func (m FirstHitRESTMapper) String() string {
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return fmt.Sprintf("FirstHitRESTMapper{\n\t%v\n}", m.MultiRESTMapper)
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}
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func (m FirstHitRESTMapper) ResourceFor(resource schema.GroupVersionResource) (schema.GroupVersionResource, error) {
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errors := []error{}
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for _, t := range m.MultiRESTMapper {
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ret, err := t.ResourceFor(resource)
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if err == nil {
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return ret, nil
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}
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errors = append(errors, err)
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}
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return schema.GroupVersionResource{}, collapseAggregateErrors(errors)
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}
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func (m FirstHitRESTMapper) KindFor(resource schema.GroupVersionResource) (schema.GroupVersionKind, error) {
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errors := []error{}
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for _, t := range m.MultiRESTMapper {
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ret, err := t.KindFor(resource)
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if err == nil {
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return ret, nil
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}
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errors = append(errors, err)
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}
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return schema.GroupVersionKind{}, collapseAggregateErrors(errors)
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}
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// RESTMapping provides the REST mapping for the resource based on the
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// kind and version. This implementation supports multiple REST schemas and
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// return the first match.
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func (m FirstHitRESTMapper) RESTMapping(gk schema.GroupKind, versions ...string) (*RESTMapping, error) {
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errors := []error{}
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for _, t := range m.MultiRESTMapper {
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ret, err := t.RESTMapping(gk, versions...)
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if err == nil {
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return ret, nil
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}
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errors = append(errors, err)
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}
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return nil, collapseAggregateErrors(errors)
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}
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// collapseAggregateErrors returns the minimal errors. it handles empty as nil, handles one item in a list
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// by returning the item, and collapses all NoMatchErrors to a single one (since they should all be the same)
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func collapseAggregateErrors(errors []error) error {
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if len(errors) == 0 {
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return nil
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}
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if len(errors) == 1 {
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return errors[0]
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}
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allNoMatchErrors := true
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for _, err := range errors {
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allNoMatchErrors = allNoMatchErrors && IsNoMatchError(err)
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}
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if allNoMatchErrors {
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return errors[0]
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}
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return utilerrors.NewAggregate(errors)
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}
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