peridot/vendor/sigs.k8s.io/structured-merge-diff/v4/fieldpath/managers.go

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2022-07-07 20:11:50 +00:00
/*
Copyright 2018 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 fieldpath
import (
"fmt"
"strings"
)
// APIVersion describes the version of an object or of a fieldset.
type APIVersion string
type VersionedSet interface {
Set() *Set
APIVersion() APIVersion
Applied() bool
}
// VersionedSet associates a version to a set.
type versionedSet struct {
set *Set
apiVersion APIVersion
applied bool
}
func NewVersionedSet(set *Set, apiVersion APIVersion, applied bool) VersionedSet {
return versionedSet{
set: set,
apiVersion: apiVersion,
applied: applied,
}
}
func (v versionedSet) Set() *Set {
return v.set
}
func (v versionedSet) APIVersion() APIVersion {
return v.apiVersion
}
func (v versionedSet) Applied() bool {
return v.applied
}
// ManagedFields is a map from manager to VersionedSet (what they own in
// what version).
type ManagedFields map[string]VersionedSet
// Equals returns true if the two managedfields are the same, false
// otherwise.
func (lhs ManagedFields) Equals(rhs ManagedFields) bool {
if len(lhs) != len(rhs) {
return false
}
for manager, left := range lhs {
right, ok := rhs[manager]
if !ok {
return false
}
if left.APIVersion() != right.APIVersion() || left.Applied() != right.Applied() {
return false
}
if !left.Set().Equals(right.Set()) {
return false
}
}
return true
}
// Copy the list, this is mostly a shallow copy.
func (lhs ManagedFields) Copy() ManagedFields {
copy := ManagedFields{}
for manager, set := range lhs {
copy[manager] = set
}
return copy
}
// Difference returns a symmetric difference between two Managers. If a
// given user's entry has version X in lhs and version Y in rhs, then
// the return value for that user will be from rhs. If the difference for
// a user is an empty set, that user will not be inserted in the map.
func (lhs ManagedFields) Difference(rhs ManagedFields) ManagedFields {
diff := ManagedFields{}
for manager, left := range lhs {
right, ok := rhs[manager]
if !ok {
if !left.Set().Empty() {
diff[manager] = left
}
continue
}
// If we have sets in both but their version
// differs, we don't even diff and keep the
// entire thing.
if left.APIVersion() != right.APIVersion() {
diff[manager] = right
continue
}
newSet := left.Set().Difference(right.Set()).Union(right.Set().Difference(left.Set()))
if !newSet.Empty() {
diff[manager] = NewVersionedSet(newSet, right.APIVersion(), false)
}
}
for manager, set := range rhs {
if _, ok := lhs[manager]; ok {
// Already done
continue
}
if !set.Set().Empty() {
diff[manager] = set
}
}
return diff
}
func (lhs ManagedFields) String() string {
s := strings.Builder{}
for k, v := range lhs {
fmt.Fprintf(&s, "%s:\n", k)
fmt.Fprintf(&s, "- Applied: %v\n", v.Applied())
fmt.Fprintf(&s, "- APIVersion: %v\n", v.APIVersion())
fmt.Fprintf(&s, "- Set: %v\n", v.Set())
}
return s.String()
}