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/*
Copyright 2016 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 storage
import (
"fmt"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
)
type ResourceEncodingConfig interface {
// StorageEncoding returns the serialization format for the resource.
// TODO this should actually return a GroupVersionKind since you can logically have multiple "matching" Kinds
// For now, it returns just the GroupVersion for consistency with old behavior
StorageEncodingFor(schema.GroupResource) (schema.GroupVersion, error)
// InMemoryEncodingFor returns the groupVersion for the in memory representation the storage should convert to.
InMemoryEncodingFor(schema.GroupResource) (schema.GroupVersion, error)
}
type DefaultResourceEncodingConfig struct {
// resources records the overriding encoding configs for individual resources.
resources map[schema.GroupResource]*OverridingResourceEncoding
scheme *runtime.Scheme
}
type OverridingResourceEncoding struct {
ExternalResourceEncoding schema.GroupVersion
InternalResourceEncoding schema.GroupVersion
}
var _ ResourceEncodingConfig = &DefaultResourceEncodingConfig{}
func NewDefaultResourceEncodingConfig(scheme *runtime.Scheme) *DefaultResourceEncodingConfig {
return &DefaultResourceEncodingConfig{resources: map[schema.GroupResource]*OverridingResourceEncoding{}, scheme: scheme}
}
func (o *DefaultResourceEncodingConfig) SetResourceEncoding(resourceBeingStored schema.GroupResource, externalEncodingVersion, internalVersion schema.GroupVersion) {
o.resources[resourceBeingStored] = &OverridingResourceEncoding{
ExternalResourceEncoding: externalEncodingVersion,
InternalResourceEncoding: internalVersion,
}
}
func (o *DefaultResourceEncodingConfig) StorageEncodingFor(resource schema.GroupResource) (schema.GroupVersion, error) {
if !o.scheme.IsGroupRegistered(resource.Group) {
return schema.GroupVersion{}, fmt.Errorf("group %q is not registered in scheme", resource.Group)
}
resourceOverride, resourceExists := o.resources[resource]
if resourceExists {
return resourceOverride.ExternalResourceEncoding, nil
}
// return the most preferred external version for the group
return o.scheme.PrioritizedVersionsForGroup(resource.Group)[0], nil
}
func (o *DefaultResourceEncodingConfig) InMemoryEncodingFor(resource schema.GroupResource) (schema.GroupVersion, error) {
if !o.scheme.IsGroupRegistered(resource.Group) {
return schema.GroupVersion{}, fmt.Errorf("group %q is not registered in scheme", resource.Group)
}
resourceOverride, resourceExists := o.resources[resource]
if resourceExists {
return resourceOverride.InternalResourceEncoding, nil
}
return schema.GroupVersion{Group: resource.Group, Version: runtime.APIVersionInternal}, nil
}
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