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finder.go
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finder.go
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/*
Copyright (C) 2022-2023 ApeCloud Co., Ltd
This file is part of KubeBlocks project
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package handler
import (
"context"
"sync"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/apecloud/kubeblocks/pkg/controller/model"
)
type FinderContext struct {
context.Context
client.Reader
Scheme runtime.Scheme
}
// Finder finds a new object by an old object
type Finder interface {
Find(*FinderContext, client.Object) *model.GVKNObjKey
}
type baseFinder struct {
objectType runtime.Object
gvkMutex sync.Mutex
gvkCache *schema.GroupVersionKind
}
func getObjectFromKey(ctx *FinderContext, key *model.GVKNObjKey) client.Object {
objectRT, err := ctx.Scheme.New(key.GroupVersionKind)
if err != nil {
return nil
}
object, ok := objectRT.(client.Object)
if !ok {
return nil
}
if err = ctx.Reader.Get(ctx, key.ObjectKey, object); err != nil {
return nil
}
return object
}
func (finder *baseFinder) getGroupVersionKind(scheme *runtime.Scheme) *schema.GroupVersionKind {
finder.gvkMutex.Lock()
defer finder.gvkMutex.Unlock()
if finder.gvkCache == nil {
// Get the kinds of the type
kinds, _, err := scheme.ObjectKinds(finder.objectType)
if err != nil {
return nil
}
// Expect only 1 kind. If there is more than one kind this is probably an edge case such as ListOptions.
if len(kinds) != 1 {
// expected exactly 1 kind for object
return nil
}
finder.gvkCache = &kinds[0]
}
return finder.gvkCache
}