mirror of
https://github.com/crazy-max/diun.git
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145 lines
3.4 KiB
Go
145 lines
3.4 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package fieldpath
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import (
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"fmt"
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"strings"
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)
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// APIVersion describes the version of an object or of a fieldset.
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type APIVersion string
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type VersionedSet interface {
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Set() *Set
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APIVersion() APIVersion
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Applied() bool
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}
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// VersionedSet associates a version to a set.
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type versionedSet struct {
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set *Set
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apiVersion APIVersion
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applied bool
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}
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func NewVersionedSet(set *Set, apiVersion APIVersion, applied bool) VersionedSet {
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return versionedSet{
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set: set,
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apiVersion: apiVersion,
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applied: applied,
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}
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}
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func (v versionedSet) Set() *Set {
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return v.set
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}
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func (v versionedSet) APIVersion() APIVersion {
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return v.apiVersion
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}
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func (v versionedSet) Applied() bool {
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return v.applied
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}
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// ManagedFields is a map from manager to VersionedSet (what they own in
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// what version).
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type ManagedFields map[string]VersionedSet
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// Equals returns true if the two managedfields are the same, false
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// otherwise.
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func (lhs ManagedFields) Equals(rhs ManagedFields) bool {
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if len(lhs) != len(rhs) {
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return false
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}
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for manager, left := range lhs {
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right, ok := rhs[manager]
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if !ok {
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return false
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}
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if left.APIVersion() != right.APIVersion() || left.Applied() != right.Applied() {
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return false
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}
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if !left.Set().Equals(right.Set()) {
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return false
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}
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}
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return true
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}
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// Copy the list, this is mostly a shallow copy.
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func (lhs ManagedFields) Copy() ManagedFields {
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copy := ManagedFields{}
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for manager, set := range lhs {
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copy[manager] = set
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}
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return copy
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}
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// Difference returns a symmetric difference between two Managers. If a
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// given user's entry has version X in lhs and version Y in rhs, then
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// the return value for that user will be from rhs. If the difference for
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// a user is an empty set, that user will not be inserted in the map.
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func (lhs ManagedFields) Difference(rhs ManagedFields) ManagedFields {
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diff := ManagedFields{}
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for manager, left := range lhs {
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right, ok := rhs[manager]
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if !ok {
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if !left.Set().Empty() {
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diff[manager] = left
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}
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continue
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}
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// If we have sets in both but their version
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// differs, we don't even diff and keep the
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// entire thing.
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if left.APIVersion() != right.APIVersion() {
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diff[manager] = right
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continue
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}
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newSet := left.Set().Difference(right.Set()).Union(right.Set().Difference(left.Set()))
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if !newSet.Empty() {
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diff[manager] = NewVersionedSet(newSet, right.APIVersion(), false)
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}
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}
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for manager, set := range rhs {
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if _, ok := lhs[manager]; ok {
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// Already done
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continue
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}
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if !set.Set().Empty() {
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diff[manager] = set
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}
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}
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return diff
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}
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func (lhs ManagedFields) String() string {
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s := strings.Builder{}
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for k, v := range lhs {
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fmt.Fprintf(&s, "%s:\n", k)
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fmt.Fprintf(&s, "- Applied: %v\n", v.Applied())
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fmt.Fprintf(&s, "- APIVersion: %v\n", v.APIVersion())
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fmt.Fprintf(&s, "- Set: %v\n", v.Set())
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}
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return s.String()
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}
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