/
strategy.go
228 lines (194 loc) · 7.78 KB
/
strategy.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
/*
Copyright 2019 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 endpointslice
import (
"context"
corev1 "k8s.io/api/core/v1"
discoveryv1beta1 "k8s.io/api/discovery/v1beta1"
apiequality "k8s.io/apimachinery/pkg/api/equality"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/validation/field"
genericapirequest "k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/apiserver/pkg/storage/names"
utilfeature "k8s.io/apiserver/pkg/util/feature"
"k8s.io/kubernetes/pkg/api/legacyscheme"
apivalidation "k8s.io/kubernetes/pkg/apis/core/validation"
"k8s.io/kubernetes/pkg/apis/discovery"
"k8s.io/kubernetes/pkg/apis/discovery/validation"
"k8s.io/kubernetes/pkg/features"
)
// endpointSliceStrategy implements verification logic for Replication.
type endpointSliceStrategy struct {
runtime.ObjectTyper
names.NameGenerator
}
// Strategy is the default logic that applies when creating and updating Replication EndpointSlice objects.
var Strategy = endpointSliceStrategy{legacyscheme.Scheme, names.SimpleNameGenerator}
// NamespaceScoped returns true because all EndpointSlices need to be within a namespace.
func (endpointSliceStrategy) NamespaceScoped() bool {
return true
}
// PrepareForCreate clears the status of an EndpointSlice before creation.
func (endpointSliceStrategy) PrepareForCreate(ctx context.Context, obj runtime.Object) {
endpointSlice := obj.(*discovery.EndpointSlice)
endpointSlice.Generation = 1
dropDisabledFieldsOnCreate(endpointSlice)
dropTopologyOnV1(ctx, nil, endpointSlice)
}
// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
func (endpointSliceStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newEPS := obj.(*discovery.EndpointSlice)
oldEPS := old.(*discovery.EndpointSlice)
// Increment generation if anything other than meta changed
// This needs to be changed if a status attribute is added to EndpointSlice
ogNewMeta := newEPS.ObjectMeta
ogOldMeta := oldEPS.ObjectMeta
newEPS.ObjectMeta = metav1.ObjectMeta{}
oldEPS.ObjectMeta = metav1.ObjectMeta{}
if !apiequality.Semantic.DeepEqual(newEPS, oldEPS) || !apiequality.Semantic.DeepEqual(ogNewMeta.Labels, ogOldMeta.Labels) {
ogNewMeta.Generation = ogOldMeta.Generation + 1
}
newEPS.ObjectMeta = ogNewMeta
oldEPS.ObjectMeta = ogOldMeta
dropDisabledFieldsOnUpdate(oldEPS, newEPS)
dropTopologyOnV1(ctx, oldEPS, newEPS)
}
// Validate validates a new EndpointSlice.
func (endpointSliceStrategy) Validate(ctx context.Context, obj runtime.Object) field.ErrorList {
endpointSlice := obj.(*discovery.EndpointSlice)
err := validation.ValidateEndpointSliceCreate(endpointSlice)
return err
}
// WarningsOnCreate returns warnings for the creation of the given object.
func (endpointSliceStrategy) WarningsOnCreate(ctx context.Context, obj runtime.Object) []string {
return nil
}
// Canonicalize normalizes the object after validation.
func (endpointSliceStrategy) Canonicalize(obj runtime.Object) {
}
// AllowCreateOnUpdate is false for EndpointSlice; this means POST is needed to create one.
func (endpointSliceStrategy) AllowCreateOnUpdate() bool {
return false
}
// ValidateUpdate is the default update validation for an end user.
func (endpointSliceStrategy) ValidateUpdate(ctx context.Context, new, old runtime.Object) field.ErrorList {
newEPS := new.(*discovery.EndpointSlice)
oldEPS := old.(*discovery.EndpointSlice)
return validation.ValidateEndpointSliceUpdate(newEPS, oldEPS)
}
// WarningsOnUpdate returns warnings for the given update.
func (endpointSliceStrategy) WarningsOnUpdate(ctx context.Context, obj, old runtime.Object) []string {
return nil
}
// AllowUnconditionalUpdate is the default update policy for EndpointSlice objects.
func (endpointSliceStrategy) AllowUnconditionalUpdate() bool {
return true
}
// dropDisabledConditionsOnCreate will drop any fields that are disabled.
func dropDisabledFieldsOnCreate(endpointSlice *discovery.EndpointSlice) {
dropTerminating := !utilfeature.DefaultFeatureGate.Enabled(features.EndpointSliceTerminatingCondition)
dropHints := !utilfeature.DefaultFeatureGate.Enabled(features.TopologyAwareHints)
if dropHints || dropTerminating {
for i := range endpointSlice.Endpoints {
if dropTerminating {
endpointSlice.Endpoints[i].Conditions.Serving = nil
endpointSlice.Endpoints[i].Conditions.Terminating = nil
}
if dropHints {
endpointSlice.Endpoints[i].Hints = nil
}
}
}
}
// dropDisabledFieldsOnUpdate will drop any disable fields that have not already
// been set on the EndpointSlice.
func dropDisabledFieldsOnUpdate(oldEPS, newEPS *discovery.EndpointSlice) {
dropTerminating := !utilfeature.DefaultFeatureGate.Enabled(features.EndpointSliceTerminatingCondition)
if dropTerminating {
for _, ep := range oldEPS.Endpoints {
if ep.Conditions.Serving != nil || ep.Conditions.Terminating != nil {
dropTerminating = false
break
}
}
}
dropHints := !utilfeature.DefaultFeatureGate.Enabled(features.TopologyAwareHints)
if dropHints {
for _, ep := range oldEPS.Endpoints {
if ep.Hints != nil {
dropHints = false
break
}
}
}
if dropHints || dropTerminating {
for i := range newEPS.Endpoints {
if dropTerminating {
newEPS.Endpoints[i].Conditions.Serving = nil
newEPS.Endpoints[i].Conditions.Terminating = nil
}
if dropHints {
newEPS.Endpoints[i].Hints = nil
}
}
}
}
// dropTopologyOnV1 on V1 request wipes the DeprecatedTopology field and copies
// the NodeName value into DeprecatedTopology
func dropTopologyOnV1(ctx context.Context, oldEPS, newEPS *discovery.EndpointSlice) {
if info, ok := genericapirequest.RequestInfoFrom(ctx); ok {
requestGV := schema.GroupVersion{Group: info.APIGroup, Version: info.APIVersion}
if requestGV == discoveryv1beta1.SchemeGroupVersion {
return
}
// do not drop topology if endpoints have not been changed
if oldEPS != nil && apiequality.Semantic.DeepEqual(oldEPS.Endpoints, newEPS.Endpoints) {
return
}
// Only node names that exist in previous version of the EndpointSlice
// deprecatedTopology fields may be retained in new version of the
// EndpointSlice.
prevNodeNames := getDeprecatedTopologyNodeNames(oldEPS)
for i := range newEPS.Endpoints {
ep := &newEPS.Endpoints[i]
newTopologyNodeName, ok := ep.DeprecatedTopology[corev1.LabelHostname]
if ep.NodeName == nil && ok && prevNodeNames.Has(newTopologyNodeName) && len(apivalidation.ValidateNodeName(newTopologyNodeName, false)) == 0 {
// Copy the label previously used to store the node name into the nodeName field,
// in order to make partial updates preserve previous node info
ep.NodeName = &newTopologyNodeName
}
// Drop writes to this field via the v1 API as documented
ep.DeprecatedTopology = nil
}
}
}
// getDeprecatedTopologyNodeNames returns a set of node names present in
// deprecatedTopology fields within the provided EndpointSlice.
func getDeprecatedTopologyNodeNames(eps *discovery.EndpointSlice) sets.String {
if eps == nil {
return nil
}
var names sets.String
for _, ep := range eps.Endpoints {
if nodeName, ok := ep.DeprecatedTopology[corev1.LabelHostname]; ok && len(nodeName) > 0 {
if names == nil {
names = sets.NewString()
}
names.Insert(nodeName)
}
}
return names
}