/
services.go
318 lines (295 loc) · 8.59 KB
/
services.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
// Copyright 2019 Hewlett Packard Enterprise Development LP
// 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 kubedirectorcluster
import (
kdv1 "github.com/bluek8s/kubedirector/pkg/apis/kubedirector/v1beta1"
"github.com/bluek8s/kubedirector/pkg/executor"
"github.com/bluek8s/kubedirector/pkg/observer"
"github.com/bluek8s/kubedirector/pkg/shared"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
)
// serviceShouldBeReconciled captures whether members in a given state should
// have their associated individual service processed.
var serviceShouldBeReconciled = map[memberState]bool{
memberCreatePending: true,
memberCreating: true,
memberReady: true,
memberConfigError: true,
memberDeletePending: false,
memberDeleting: false,
}
// syncClusterService is responsible for dealing with the per-member services.
// It and syncMemberServices are the only functions in this file that are
// invoked from another file (from the syncCluster function in cluster.go).
// Managing service changes may result in operations on k8s services. This
// function will also modify the status data structures to record the service
// name.
func syncClusterService(
reqLogger logr.Logger,
cr *kdv1.KubeDirectorCluster,
) error {
// If we already have the cluster service name stored,
// look it up to see if it still exists.
clusterService, queryErr := queryService(
reqLogger,
cr,
cr.Status.ClusterService,
)
if queryErr != nil {
return queryErr
}
if clusterService == nil {
// We don't have an existing service, and we do need one.
if cr.Status.ClusterService != "" {
shared.LogInfo(
reqLogger,
cr,
shared.EventReasonCluster,
"re-creating missing cluster service",
)
}
createErr := handleClusterServiceCreate(reqLogger, cr)
if createErr != nil {
return createErr
}
} else {
// We have an existing service so just reconcile its config.
handleClusterServiceConfig(reqLogger, cr, clusterService)
}
return nil
}
// syncMemberServices is responsible for dealing with the per-member services.
// It and syncClusterService are the only functions in this file that are
// invoked from another file (from syncCluster in cluster.go). Managing
// service changes may result in operations on k8s services. This function
// will also modify the status data structures to record the service names.
func syncMemberServices(
reqLogger logr.Logger,
cr *kdv1.KubeDirectorCluster,
roles []*roleInfo,
) error {
for _, role := range roles {
if role.roleStatus != nil {
for i := 0; i < len(role.roleStatus.Members); i++ {
serviceErr := handleMemberService(
reqLogger,
cr,
role,
&(role.roleStatus.Members[i]),
)
if serviceErr != nil {
return serviceErr
}
}
}
}
return nil
}
// handleClusterServiceCreate will create a cluster "headless" service and
// store its name in the cluster status. Failure to create this service will
// be a reconciler-stopping error.
func handleClusterServiceCreate(
reqLogger logr.Logger,
cr *kdv1.KubeDirectorCluster,
) error {
clusterService, createErr := executor.CreateHeadlessService(cr)
if createErr != nil {
// Not much to do if we can't create it... we'll just keep trying
// on every run through the reconciler.
shared.LogError(
reqLogger,
createErr,
cr,
shared.EventReasonCluster,
"failed to create cluster service",
)
cr.Status.ClusterService = ""
return createErr
}
cr.Status.ClusterService = clusterService.Name
return nil
}
// handleClusterServiceConfig checks an existing cluster "headless" service to
// see if any of its important properties need to be reconciled. Failure to
// reconcile will not be treated as a reconciler-stopping error; we'll just try
// again next time.
func handleClusterServiceConfig(
reqLogger logr.Logger,
cr *kdv1.KubeDirectorCluster,
clusterService *corev1.Service,
) {
updateErr := executor.UpdateHeadlessService(reqLogger, cr, clusterService)
if updateErr != nil {
shared.LogErrorf(
reqLogger,
updateErr,
cr,
shared.EventReasonCluster,
"failed to update Service{%s}",
cr.Status.ClusterService,
)
}
}
// handleMemberService makes sure that the per-member service exists if it
// should. (If it should not, we don't worry about it here... member syncing
// will clean it up.) If the service is created, it will store this service
// name in the member status. Failure to create a service as needed will be a
// reconciler-stopping error.
func handleMemberService(
reqLogger logr.Logger,
cr *kdv1.KubeDirectorCluster,
role *roleInfo,
member *kdv1.MemberStatus,
) error {
if serviceShouldBeReconciled[memberState(member.State)] {
if member.Service == zeroPortsService {
// TBD: Currently nothing to do if no ports on the service. This
// will change in the future if/when handleMemberServiceConfig
// supports modification of an existing service's ports.
return nil
}
memberService, queryErr := queryService(
reqLogger,
cr,
member.Service,
)
if queryErr != nil {
return queryErr
}
if memberService == nil {
if member.Service != "" && member.Service != zeroPortsService {
shared.LogInfof(
reqLogger,
cr,
shared.EventReasonMember,
"re-creating missing service for member{%s} in role{%s}",
member.Pod,
role.roleStatus.Name,
)
}
// Need to create a service.
createErr := handleMemberServiceCreate(
reqLogger,
cr,
role,
member,
)
if createErr != nil {
return createErr
}
} else {
// We have an existing service so just reconcile its config.
handleMemberServiceConfig(
reqLogger,
cr,
role,
member,
memberService,
)
}
}
return nil
}
// handleMemberServiceCreate will create a per-member service and store its
// name in the member status. Failure to create this service will be a
// reconciler-stopping error. In the special case of having no ports to configure,
// no service object will be created, and the service element of the member
// status will be assigned the special constant defined by zeroPortsService.
func handleMemberServiceCreate(
reqLogger logr.Logger,
cr *kdv1.KubeDirectorCluster,
role *roleInfo,
member *kdv1.MemberStatus,
) error {
memberService, createErr := executor.CreatePodService(
cr,
role.roleSpec,
member.Pod,
)
if createErr != nil {
// Not much to do if we can't create it... we'll just keep trying
// on every run through the reconciler.
shared.LogErrorf(
reqLogger,
createErr,
cr,
shared.EventReasonMember,
"failed to create member service for member{%s} in role{%s}",
member.Pod,
role.roleStatus.Name,
)
member.Service = ""
return createErr
}
if memberService == nil {
member.Service = zeroPortsService
} else {
member.Service = memberService.Name
}
return nil
}
// handleMemberServiceConfig checks an existing per-member service to see if
// any of its important properties need to be reconciled. Failure to reconcile
// will not be treated as a reconciler-stopping error; we'll just try again next
// time.
func handleMemberServiceConfig(
reqLogger logr.Logger,
cr *kdv1.KubeDirectorCluster,
role *roleInfo,
member *kdv1.MemberStatus,
memberService *corev1.Service,
) {
executor.UpdatePodService(
reqLogger,
cr,
role.roleSpec,
member.Pod,
memberService,
)
}
// queryService is a generalized lookup subroutine for finding either
// a cluster "headless" service or a per-member service. It will return
// nil for the Service pointer if the object does not exist.
func queryService(
reqLogger logr.Logger,
cr *kdv1.KubeDirectorCluster,
serviceName string,
) (*corev1.Service, error) {
var service *corev1.Service
if serviceName == "" || serviceName == zeroPortsService {
service = nil
} else {
serviceFound, queryErr := observer.GetService(
cr.Namespace,
serviceName,
)
if queryErr == nil {
service = serviceFound
} else {
if errors.IsNotFound(queryErr) {
service = nil
} else {
shared.LogErrorf(
reqLogger,
queryErr,
cr,
shared.EventReasonNoEvent,
"failed to query Service{%s}",
serviceName,
)
return nil, queryErr
}
}
}
return service, nil
}