/
service_types.go
327 lines (281 loc) · 10 KB
/
service_types.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
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
/*
Copyright 2018 The Knative 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 v1alpha1
import (
"encoding/json"
"reflect"
"time"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// +genclient
// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
// Service acts as a top-level container that manages a set of Routes and
// Configurations which implement a network service. Service exists to provide a
// singular abstraction which can be access controlled, reasoned about, and
// which encapsulates software lifecycle decisions such as rollout policy and
// team resource ownership. Service acts only as an orchestrator of the
// underlying Routes and Configurations (much as a kubernetes Deployment
// orchestrates ReplicaSets), and its usage is optional but recommended.
//
// The Service's controller will track the statuses of its owned Configuration
// and Route, reflecting their statuses and conditions as its own.
//
// See also: https://github.com/knative/serving/blob/master/docs/spec/overview.md#service
type Service struct {
metav1.TypeMeta `json:",inline"`
// +optional
metav1.ObjectMeta `json:"metadata,omitempty"`
// +optional
Spec ServiceSpec `json:"spec,omitempty"`
// +optional
Status ServiceStatus `json:"status,omitempty"`
}
// Check that Service may be validated and defaulted.
var _ Validatable = (*Service)(nil)
var _ Defaultable = (*Service)(nil)
// ServiceSpec represents the configuration for the Service object. Exactly one
// of its members (other than Generation) must be specified. Services can either
// track the latest ready revision of a configuration or be pinned to a specific
// revision.
type ServiceSpec struct {
// TODO: Generation does not work correctly with CRD. They are scrubbed
// by the APIserver (https://github.com/kubernetes/kubernetes/issues/58778)
// So, we add Generation here. Once that gets fixed, remove this and use
// ObjectMeta.Generation instead.
// +optional
Generation int64 `json:"generation,omitempty"`
// RunLatest defines a simple Service. It will automatically
// configure a route that keeps the latest ready revision
// from the supplied configuration running.
// +optional
RunLatest *RunLatestType `json:"runLatest,omitempty"`
// Pins this service to a specific revision name. The revision must
// be owned by the configuration provided.
// +optional
Pinned *PinnedType `json:"pinned,omitempty"`
}
type RunLatestType struct {
// The configuration for this service.
// +optional
Configuration ConfigurationSpec `json:"configuration,omitempty"`
}
type PinnedType struct {
// The revision name to pin this service to until changed
// to a different service type.
// +optional
RevisionName string `json:"revisionName,omitempty"`
// The configuration for this service.
// +optional
Configuration ConfigurationSpec `json:"configuration,omitempty"`
}
type ServiceCondition struct {
Type ServiceConditionType `json:"type"`
Status corev1.ConditionStatus `json:"status" description:"status of the condition, one of True, False, Unknown"`
// +optional
LastTransitionTime metav1.Time `json:"lastTransitionTime,omitempty" description:"last time the condition transit from one status to another"`
// +optional
Reason string `json:"reason,omitempty" description:"one-word CamelCase reason for the condition's last transition"`
// +optional
Message string `json:"message,omitempty" description:"human-readable message indicating details about last transition"`
}
// ServiceConditionType represents an Service condition value
type ServiceConditionType string
const (
// ServiceConditionReady is set when the service is configured
// and has available backends ready to receive traffic.
ServiceConditionReady ServiceConditionType = "Ready"
// ServiceConditionRoutesReady is set when the service's underlying
// routes have reported readiness.
ServiceConditionRoutesReady ServiceConditionType = "RoutesReady"
// ServiceConditionConfigurationsReady is set when the service's underlying
// configurations have reported readiness.
ServiceConditionConfigurationsReady ServiceConditionType = "ConfigurationsReady"
)
type ServiceStatus struct {
// +optional
Conditions []ServiceCondition `json:"conditions,omitempty"`
// From RouteStatus.
// Domain holds the top-level domain that will distribute traffic over the provided targets.
// It generally has the form {route-name}.{route-namespace}.{cluster-level-suffix}
// +optional
Domain string `json:"domain,omitempty"`
// From RouteStatus.
// DomainInternal holds the top-level domain that will distribute traffic over the provided
// targets from inside the cluster. It generally has the form
// {route-name}.{route-namespace}.svc.cluster.local
// +optional
DomainInternal string `json:"domainInternal,omitempty"`
// From RouteStatus.
// Traffic holds the configured traffic distribution.
// These entries will always contain RevisionName references.
// When ConfigurationName appears in the spec, this will hold the
// LatestReadyRevisionName that we last observed.
// +optional
Traffic []TrafficTarget `json:"traffic,omitempty"`
// From ConfigurationStatus.
// LatestReadyRevisionName holds the name of the latest Revision stamped out
// from this Service's Configuration that has had its "Ready" condition become "True".
// +optional
LatestReadyRevisionName string `json:"latestReadyRevisionName,omitempty"`
// From ConfigurationStatus.
// LatestCreatedRevisionName is the last revision that was created from this Service's
// Configuration. It might not be ready yet, for that use LatestReadyRevisionName.
// +optional
LatestCreatedRevisionName string `json:"latestCreatedRevisionName,omitempty"`
// ObservedGeneration is the 'Generation' of the Service that
// was last processed by the controller.
// +optional
ObservedGeneration int64 `json:"observedGeneration,omitempty"`
}
// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
// ServiceList is a list of Service resources
type ServiceList struct {
metav1.TypeMeta `json:",inline"`
metav1.ListMeta `json:"metadata"`
Items []Service `json:"items"`
}
func (s *Service) GetGeneration() int64 {
return s.Spec.Generation
}
func (s *Service) SetGeneration(generation int64) {
s.Spec.Generation = generation
}
func (s *Service) GetSpecJSON() ([]byte, error) {
return json.Marshal(s.Spec)
}
func (ss *ServiceStatus) IsReady() bool {
if c := ss.GetCondition(ServiceConditionReady); c != nil {
return c.Status == corev1.ConditionTrue
}
return false
}
func (ss *ServiceStatus) GetCondition(t ServiceConditionType) *ServiceCondition {
for _, cond := range ss.Conditions {
if cond.Type == t {
return &cond
}
}
return nil
}
func (ss *ServiceStatus) setCondition(new *ServiceCondition) {
if new == nil {
return
}
t := new.Type
var conditions []ServiceCondition
for _, cond := range ss.Conditions {
if cond.Type != t {
conditions = append(conditions, cond)
} else {
// If we'd only update the LastTransitionTime, then return.
new.LastTransitionTime = cond.LastTransitionTime
if reflect.DeepEqual(new, &cond) {
return
}
}
}
new.LastTransitionTime = metav1.NewTime(time.Now())
conditions = append(conditions, *new)
ss.Conditions = conditions
}
func (ss *ServiceStatus) RemoveCondition(t ServiceConditionType) {
var conditions []ServiceCondition
for _, cond := range ss.Conditions {
if cond.Type != t {
conditions = append(conditions, cond)
}
}
ss.Conditions = conditions
}
func (ss *ServiceStatus) InitializeConditions() {
for _, cond := range []ServiceConditionType{
ServiceConditionReady,
ServiceConditionConfigurationsReady,
ServiceConditionRoutesReady,
} {
if rc := ss.GetCondition(cond); rc == nil {
ss.setCondition(&ServiceCondition{
Type: cond,
Status: corev1.ConditionUnknown,
})
}
}
}
func (ss *ServiceStatus) PropagateConfigurationStatus(cs ConfigurationStatus) {
ss.LatestReadyRevisionName = cs.LatestReadyRevisionName
ss.LatestCreatedRevisionName = cs.LatestCreatedRevisionName
cc := cs.GetCondition(ConfigurationConditionReady)
if cc == nil {
return
}
sct := []ServiceConditionType{ServiceConditionConfigurationsReady}
// If the underlying Configuration reported not ready, then bubble it up.
if cc.Status != corev1.ConditionTrue {
sct = append(sct, ServiceConditionReady)
}
for _, cond := range sct {
ss.setCondition(&ServiceCondition{
Type: cond,
Status: cc.Status,
Reason: cc.Reason,
Message: cc.Message,
})
}
if cc.Status == corev1.ConditionTrue {
ss.checkAndMarkReady()
}
}
func (ss *ServiceStatus) PropagateRouteStatus(rs RouteStatus) {
ss.Domain = rs.Domain
ss.DomainInternal = rs.DomainInternal
ss.Traffic = rs.Traffic
rc := rs.GetCondition(RouteConditionReady)
if rc == nil {
return
}
sct := []ServiceConditionType{ServiceConditionRoutesReady}
// If the underlying Route reported not ready, then bubble it up.
if rc.Status != corev1.ConditionTrue {
sct = append(sct, ServiceConditionReady)
}
for _, cond := range sct {
ss.setCondition(&ServiceCondition{
Type: cond,
Status: rc.Status,
Reason: rc.Reason,
Message: rc.Message,
})
}
if rc.Status == corev1.ConditionTrue {
ss.checkAndMarkReady()
}
}
func (ss *ServiceStatus) checkAndMarkReady() {
for _, cond := range []ServiceConditionType{
ServiceConditionConfigurationsReady,
ServiceConditionRoutesReady,
} {
c := ss.GetCondition(cond)
if c == nil || c.Status != corev1.ConditionTrue {
return
}
}
ss.markReady()
}
func (ss *ServiceStatus) markReady() {
ss.setCondition(&ServiceCondition{
Type: ServiceConditionReady,
Status: corev1.ConditionTrue,
})
}