mirror of
https://github.com/crazy-max/diun.git
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99 lines
3.6 KiB
Go
99 lines
3.6 KiB
Go
/*
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Copyright 2019 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 runtime
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import (
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"sync"
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"k8s.io/apimachinery/pkg/runtime/schema"
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)
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type equivalentResourceRegistry struct {
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// keyFunc computes a key for the specified resource (this allows honoring colocated resources across API groups).
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// if null, or if "" is returned, resource.String() is used as the key
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keyFunc func(resource schema.GroupResource) string
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// resources maps key -> subresource -> equivalent resources (subresource is not included in the returned resources).
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// main resources are stored with subresource="".
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resources map[string]map[string][]schema.GroupVersionResource
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// kinds maps resource -> subresource -> kind
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kinds map[schema.GroupVersionResource]map[string]schema.GroupVersionKind
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// keys caches the computed key for each GroupResource
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keys map[schema.GroupResource]string
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mutex sync.RWMutex
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}
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var _ EquivalentResourceMapper = (*equivalentResourceRegistry)(nil)
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var _ EquivalentResourceRegistry = (*equivalentResourceRegistry)(nil)
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// NewEquivalentResourceRegistry creates a resource registry that considers all versions of a GroupResource to be equivalent.
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func NewEquivalentResourceRegistry() EquivalentResourceRegistry {
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return &equivalentResourceRegistry{}
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}
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// NewEquivalentResourceRegistryWithIdentity creates a resource mapper with a custom identity function.
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// If "" is returned by the function, GroupResource#String is used as the identity.
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// GroupResources with the same identity string are considered equivalent.
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func NewEquivalentResourceRegistryWithIdentity(keyFunc func(schema.GroupResource) string) EquivalentResourceRegistry {
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return &equivalentResourceRegistry{keyFunc: keyFunc}
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}
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func (r *equivalentResourceRegistry) EquivalentResourcesFor(resource schema.GroupVersionResource, subresource string) []schema.GroupVersionResource {
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r.mutex.RLock()
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defer r.mutex.RUnlock()
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return r.resources[r.keys[resource.GroupResource()]][subresource]
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}
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func (r *equivalentResourceRegistry) KindFor(resource schema.GroupVersionResource, subresource string) schema.GroupVersionKind {
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r.mutex.RLock()
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defer r.mutex.RUnlock()
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return r.kinds[resource][subresource]
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}
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func (r *equivalentResourceRegistry) RegisterKindFor(resource schema.GroupVersionResource, subresource string, kind schema.GroupVersionKind) {
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r.mutex.Lock()
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defer r.mutex.Unlock()
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if r.kinds == nil {
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r.kinds = map[schema.GroupVersionResource]map[string]schema.GroupVersionKind{}
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}
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if r.kinds[resource] == nil {
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r.kinds[resource] = map[string]schema.GroupVersionKind{}
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}
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r.kinds[resource][subresource] = kind
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// get the shared key of the parent resource
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key := ""
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gr := resource.GroupResource()
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if r.keyFunc != nil {
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key = r.keyFunc(gr)
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}
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if key == "" {
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key = gr.String()
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}
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if r.keys == nil {
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r.keys = map[schema.GroupResource]string{}
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}
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r.keys[gr] = key
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if r.resources == nil {
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r.resources = map[string]map[string][]schema.GroupVersionResource{}
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}
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if r.resources[key] == nil {
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r.resources[key] = map[string][]schema.GroupVersionResource{}
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}
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r.resources[key][subresource] = append(r.resources[key][subresource], resource)
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}
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