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cache.go
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cache.go
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/*
Copyright 2021 The KubeVela 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 resourcekeeper
import (
"context"
"github.com/pkg/errors"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/oam-dev/kubevela/apis/core.oam.dev/v1beta1"
"github.com/oam-dev/kubevela/pkg/multicluster"
"github.com/oam-dev/kubevela/pkg/oam"
"github.com/oam-dev/kubevela/pkg/utils/apply"
)
type resourceCacheEntry struct {
exists bool
err error
obj *unstructured.Unstructured
mr v1beta1.ManagedResource
loaded bool
usedBy []*v1beta1.ResourceTracker
latestActiveRT *v1beta1.ResourceTracker
gcExecutorRT *v1beta1.ResourceTracker
}
type resourceCache struct {
app *v1beta1.Application
cli client.Client
m map[string]*resourceCacheEntry
}
func newResourceCache(cli client.Client, app *v1beta1.Application) *resourceCache {
return &resourceCache{
app: app,
cli: cli,
m: map[string]*resourceCacheEntry{},
}
}
func (cache *resourceCache) registerResourceTrackers(rts ...*v1beta1.ResourceTracker) {
for _, rt := range rts {
if rt == nil {
continue
}
for _, mr := range rt.Spec.ManagedResources {
key := mr.ResourceKey()
entry, cached := cache.m[key]
if !cached {
entry = &resourceCacheEntry{obj: mr.ToUnstructured(), mr: mr}
cache.m[key] = entry
}
entry.usedBy = append(entry.usedBy, rt)
}
}
for _, entry := range cache.m {
for i := len(entry.usedBy) - 1; i >= 0; i-- {
if entry.usedBy[i].GetDeletionTimestamp() == nil {
entry.latestActiveRT = entry.usedBy[i]
break
}
}
if entry.latestActiveRT != nil {
entry.gcExecutorRT = entry.latestActiveRT
} else if len(entry.usedBy) > 0 {
entry.gcExecutorRT = entry.usedBy[len(entry.usedBy)-1]
}
}
}
func (cache *resourceCache) get(ctx context.Context, mr v1beta1.ManagedResource) *resourceCacheEntry {
key := mr.ResourceKey()
entry, cached := cache.m[key]
if !cached {
entry = &resourceCacheEntry{obj: mr.ToUnstructured(), mr: mr}
cache.m[key] = entry
}
if !entry.loaded {
if err := cache.cli.Get(multicluster.ContextWithClusterName(ctx, mr.Cluster), mr.NamespacedName(), entry.obj); err != nil {
if multicluster.IsNotFoundOrClusterNotExists(err) || meta.IsNoMatchError(err) || runtime.IsNotRegisteredError(err) {
entry.exists = false
} else {
entry.err = errors.Wrapf(err, "failed to get resource %s", key)
}
} else {
entry.exists = cache.exists(entry.obj)
}
entry.loaded = true
}
return entry
}
func (cache *resourceCache) exists(manifest *unstructured.Unstructured) bool {
if cache.app == nil {
return true
}
appKey, controlledBy := apply.GetAppKey(cache.app), apply.GetControlledBy(manifest)
if appKey == controlledBy || manifest.GetResourceVersion() == "" {
return true
}
annotations := manifest.GetAnnotations()
if annotations == nil || annotations[oam.AnnotationAppSharedBy] == "" {
return false
}
return apply.ContainsSharer(annotations[oam.AnnotationAppSharedBy], cache.app)
}