/
deployment_worker.go
273 lines (249 loc) · 8.2 KB
/
deployment_worker.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
// Copyright 2017 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package caasunitprovisioner
import (
"reflect"
"github.com/juju/errors"
"github.com/juju/names/v5"
"github.com/juju/worker/v3"
"github.com/juju/worker/v3/catacomb"
apicaasunitprovisioner "github.com/juju/juju/api/controller/caasunitprovisioner"
"github.com/juju/juju/caas"
k8sprovider "github.com/juju/juju/caas/kubernetes/provider"
k8sspecs "github.com/juju/juju/caas/kubernetes/provider/specs"
"github.com/juju/juju/core/status"
"github.com/juju/juju/core/watcher"
"github.com/juju/juju/rpc/params"
)
// deploymentWorker informs the CAAS broker of how many pods to run and their spec, and
// lets the broker figure out how to make that all happen.
type deploymentWorker struct {
catacomb catacomb.Catacomb
application string
provisioningStatusSetter ProvisioningStatusSetter
broker ServiceBroker
applicationGetter ApplicationGetter
applicationUpdater ApplicationUpdater
provisioningInfoGetter ProvisioningInfoGetter
logger Logger
}
func newDeploymentWorker(
application string,
provisioningStatusSetter ProvisioningStatusSetter,
broker ServiceBroker,
provisioningInfoGetter ProvisioningInfoGetter,
applicationGetter ApplicationGetter,
applicationUpdater ApplicationUpdater,
logger Logger,
) (worker.Worker, error) {
w := &deploymentWorker{
application: application,
provisioningStatusSetter: provisioningStatusSetter,
broker: broker,
provisioningInfoGetter: provisioningInfoGetter,
applicationGetter: applicationGetter,
applicationUpdater: applicationUpdater,
logger: logger,
}
if err := catacomb.Invoke(catacomb.Plan{
Site: &w.catacomb,
Work: w.loop,
}); err != nil {
return nil, errors.Trace(err)
}
return w, nil
}
// Kill is part of the worker.Worker interface.
func (w *deploymentWorker) Kill() {
w.catacomb.Kill(nil)
}
// Wait is part of the worker.Worker interface.
func (w *deploymentWorker) Wait() error {
return w.catacomb.Wait()
}
func (w *deploymentWorker) loop() error {
appScaleWatcher, err := w.applicationGetter.WatchApplicationScale(w.application)
if err != nil {
return errors.Trace(err)
}
_ = w.catacomb.Add(appScaleWatcher)
var (
pw watcher.NotifyWatcher
provisionChan watcher.NotifyChannel
currentScale int
currentInfo *apicaasunitprovisioner.ProvisioningInfo
)
gotSpecNotify := false
serviceUpdated := false
desiredScale := 0
logger := w.logger
for {
select {
case <-w.catacomb.Dying():
return w.catacomb.ErrDying()
case _, ok := <-appScaleWatcher.Changes():
if !ok {
return errors.New("watcher closed channel")
}
var err error
desiredScale, err = w.applicationGetter.ApplicationScale(w.application)
if err != nil {
return errors.Trace(err)
}
logger.Debugf("desiredScale changed to %d", desiredScale)
if desiredScale > 0 && provisionChan == nil {
var err error
pw, err = w.provisioningInfoGetter.WatchPodSpec(w.application)
if err != nil {
return errors.Trace(err)
}
_ = w.catacomb.Add(pw)
provisionChan = pw.Changes()
}
case _, ok := <-provisionChan:
if !ok {
return errors.New("watcher closed channel")
}
gotSpecNotify = true
}
if desiredScale > 0 && !gotSpecNotify {
continue
}
info, err := w.provisioningInfoGetter.ProvisioningInfo(w.application)
if errors.IsNotFound(err) {
// No pod spec defined for a unit yet;
// wait for one to be set.
continue
} else if err != nil {
return errors.Trace(err)
}
if desiredScale == 0 {
if pw != nil {
_ = worker.Stop(pw)
provisionChan = nil
}
logger.Debugf("no units for %v", w.application)
err = w.broker.EnsureService(w.application, w.provisioningStatusSetter.SetOperatorStatus, &caas.ServiceParams{}, 0, nil)
if err != nil {
return errors.Trace(err)
}
currentScale = 0
continue
}
if desiredScale == currentScale && isProvisionInfoEqual(info, currentInfo) {
continue
}
// We need to disallow updates that k8s does not yet support,
// eg changing the filesystem or device directives, or deployment info.
// TODO(wallyworld) - support resizing of existing storage.
if currentInfo != nil {
var unsupportedReason string
if !reflect.DeepEqual(info.DeploymentInfo, currentInfo.DeploymentInfo) {
unsupportedReason = "k8s does not support updating deployment info"
} else if !reflect.DeepEqual(info.Filesystems, currentInfo.Filesystems) {
unsupportedReason = "k8s does not support updating storage"
} else if !reflect.DeepEqual(info.Devices, currentInfo.Devices) {
unsupportedReason = "k8s does not support updating devices"
}
if unsupportedReason != "" {
if err = w.provisioningStatusSetter.SetOperatorStatus(
w.application,
status.Error,
unsupportedReason,
nil,
); err != nil {
return errors.Trace(err)
}
continue
}
}
currentScale = desiredScale
currentInfo = info
appConfig, err := w.applicationGetter.ApplicationConfig(w.application)
if err != nil {
return errors.Trace(err)
}
serviceParams, err := provisionInfoToServiceParams(info)
if err != nil {
return errors.Trace(err)
}
err = w.broker.EnsureService(w.application, w.provisioningStatusSetter.SetOperatorStatus, serviceParams, desiredScale, appConfig)
if err != nil {
// Some errors we don't want to exit the worker.
if k8sprovider.MaskError(err) {
logger.Errorf(err.Error())
continue
}
return errors.Trace(err)
}
logger.Debugf("ensured deployment for %s for %v units", w.application, desiredScale)
if serviceParams.PodSpec == nil {
continue
}
if !serviceUpdated && !serviceParams.PodSpec.OmitServiceFrontend {
service, err := w.broker.GetService(w.application, caas.ModeWorkload, false)
if err != nil && !errors.IsNotFound(err) {
return errors.Annotate(err, "cannot get new service details")
}
if err = updateApplicationService(
names.NewApplicationTag(w.application), service, w.applicationUpdater,
); err != nil {
return errors.Trace(err)
}
serviceUpdated = true
}
}
}
func provisionInfoToServiceParams(info *apicaasunitprovisioner.ProvisioningInfo) (serviceParams *caas.ServiceParams, err error) {
if len(info.PodSpec) > 0 && len(info.RawK8sSpec) > 0 {
// This should never happen.
return nil, errors.NewForbidden(nil, "either PodSpec or RawK8sSpec can be set for each application, but not both")
}
serviceParams = &caas.ServiceParams{
Constraints: info.Constraints,
ResourceTags: info.Tags,
Filesystems: info.Filesystems,
Devices: info.Devices,
ImageDetails: info.ImageDetails,
CharmModifiedVersion: info.CharmModifiedVersion,
Deployment: caas.DeploymentParams{
DeploymentType: caas.DeploymentType(info.DeploymentInfo.DeploymentType),
ServiceType: caas.ServiceType(info.DeploymentInfo.ServiceType),
},
}
if len(info.PodSpec) > 0 {
if serviceParams.PodSpec, err = k8sspecs.ParsePodSpec(info.PodSpec); err != nil {
return nil, errors.Annotate(err, "cannot parse pod spec")
}
} else if len(info.RawK8sSpec) > 0 {
if serviceParams.RawK8sSpec, err = k8sspecs.ParseRawK8sSpec(info.RawK8sSpec); err != nil {
return nil, errors.Annotate(err, "cannot parse raw k8s spec")
}
}
return serviceParams, nil
}
// isProvisionInfoChanged checks if podspec or raw k8s spec changed or not.
func isProvisionInfoEqual(newInfo, oldInfo *apicaasunitprovisioner.ProvisioningInfo) bool {
if newInfo == nil && oldInfo == nil {
return true
} else if newInfo == nil || oldInfo == nil {
return false
}
return newInfo.PodSpec == oldInfo.PodSpec &&
newInfo.RawK8sSpec == oldInfo.RawK8sSpec &&
newInfo.CharmModifiedVersion == oldInfo.CharmModifiedVersion
}
func updateApplicationService(appTag names.ApplicationTag, svc *caas.Service, updater ApplicationUpdater) error {
if svc == nil || svc.Id == "" {
return nil
}
return updater.UpdateApplicationService(
params.UpdateApplicationServiceArg{
ApplicationTag: appTag.String(),
ProviderId: svc.Id,
Addresses: params.FromProviderAddresses(svc.Addresses...),
Scale: svc.Scale,
Generation: svc.Generation,
},
)
}