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snapshot.go
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snapshot.go
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package resource
import (
"golang.org/x/exp/maps"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
)
type GVKSelectorFunc = func(GVK schema.GroupVersionKind) bool
// Deprecated: TypedObject is not needed. use `GetObjectKind().SetGroupVersionKind` instead.
type TypedObject = client.Object
// Snapshot represents a generic snapshot of client.Objects scoped to a single cluster
type Snapshot map[schema.GroupVersionKind]map[types.NamespacedName]client.Object
func (s Snapshot) Insert(gvk schema.GroupVersionKind, obj client.Object) {
objects, ok := s[gvk]
if !ok {
objects = map[types.NamespacedName]client.Object{}
}
objects[types.NamespacedName{
Namespace: obj.GetNamespace(),
Name: obj.GetName(),
}] = obj
s[gvk] = objects
}
func (s Snapshot) Delete(gvk schema.GroupVersionKind, id types.NamespacedName) {
resources, ok := s[gvk]
if !ok {
return
}
delete(resources, id)
s[gvk] = resources
}
func (s Snapshot) ForEachObject(handleObject func(gvk schema.GroupVersionKind, obj client.Object)) {
if s == nil {
return
}
for gvk, objs := range s {
for _, obj := range objs {
handleObject(gvk, obj)
}
}
}
func (s Snapshot) Clone(selectors ...GVKSelectorFunc) Snapshot {
return s.cloneInternal(true, selectors...)
}
func (s Snapshot) ShallowCopy(selectors ...GVKSelectorFunc) Snapshot {
return s.cloneInternal(false, selectors...)
}
func (s Snapshot) cloneInternal(deepCopy bool, selectors ...GVKSelectorFunc) Snapshot {
clone := Snapshot{}
for k, v := range s {
if len(selectors) == 0 {
if deepCopy {
clone[k] = copyNnsMap(v)
} else {
clone[k] = make(map[types.NamespacedName]client.Object, len(v))
maps.Copy(clone[k], v)
}
continue
}
selected := false
for _, selector := range selectors {
if selector(k) {
selected = true
break
}
}
if selected {
if deepCopy {
clone[k] = copyNnsMap(v)
} else {
clone[k] = make(map[types.NamespacedName]client.Object, len(v))
maps.Copy(clone[k], v)
}
continue
}
}
return clone
}
// Merges the Snapshot with a Snapshot passed in as an argument. The values
// in the passed in Snapshot will take precedence when there is an object mapped
// to the same gvk and name in both Snapshots.
func (s Snapshot) Merge(toMerge Snapshot) Snapshot {
merged := s.Clone()
for gvk, objectsMap := range toMerge {
if _, ok := merged[gvk]; ok {
for name, object := range objectsMap {
// If there is already an object specified here, the object from toMerge
// will replace it
merged[gvk][name] = object
}
} else {
merged[gvk] = objectsMap
}
}
return merged
}
// ClusterSnapshot represents a set of snapshots partitioned by cluster
type ClusterSnapshot map[string]Snapshot
func (s ClusterSnapshot) ForEachObject(
handleObject func(
cluster string,
gvk schema.GroupVersionKind,
obj client.Object,
),
) {
if s == nil {
return
}
for cluster, snap := range s {
snap.ForEachObject(func(gvk schema.GroupVersionKind, obj client.Object) {
handleObject(cluster, gvk, obj)
})
}
}
func copyNnsMap(m map[types.NamespacedName]client.Object) map[types.NamespacedName]client.Object {
nnsMapCopy := make(map[types.NamespacedName]client.Object, len(m))
for k, v := range m {
nnsMapCopy[k] = v.DeepCopyObject().(client.Object)
}
return nnsMapCopy
}
func (cs ClusterSnapshot) Insert(cluster string, gvk schema.GroupVersionKind, obj client.Object) {
snapshot, ok := cs[cluster]
if !ok {
snapshot = Snapshot{}
}
snapshot.Insert(gvk, obj)
cs[cluster] = snapshot
}
func (cs ClusterSnapshot) Delete(
cluster string,
gvk schema.GroupVersionKind,
id types.NamespacedName,
) {
snapshot, ok := cs[cluster]
if !ok {
return
}
snapshot.Delete(gvk, id)
cs[cluster] = snapshot
}
func (cs ClusterSnapshot) Clone(selectors ...GVKSelectorFunc) ClusterSnapshot {
clone := ClusterSnapshot{}
for k, v := range cs {
clone[k] = v.Clone(selectors...)
}
return clone
}
func (cs ClusterSnapshot) ShallowCopy(selectors ...GVKSelectorFunc) ClusterSnapshot {
clone := ClusterSnapshot{}
for k, v := range cs {
clone[k] = v.ShallowCopy(selectors...)
}
return clone
}
// Merges the ClusterSnapshot with a ClusterSnapshot passed in as an argument.
// If a cluster exists in both ClusterSnapshots, then both Snapshots for the
// cluster is merged; with the passed in ClusterSnapshot's corresponding Snapshot
// taking precedence in case of conflicts.
func (cs ClusterSnapshot) Merge(toMerge ClusterSnapshot) ClusterSnapshot {
merged := cs.Clone()
for cluster, snapshot := range toMerge {
if baseSnap, ok := merged[cluster]; ok {
merged[cluster] = baseSnap.Merge(snapshot)
} else {
merged[cluster] = snapshot
}
}
return merged
}