forked from knative/serving
/
revision.go
424 lines (360 loc) · 14.1 KB
/
revision.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
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
/*
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 revision
import (
"context"
"net/http"
"reflect"
"strings"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/equality"
apierrs "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/util/sets"
appsv1informers "k8s.io/client-go/informers/apps/v1"
corev1informers "k8s.io/client-go/informers/core/v1"
appsv1listers "k8s.io/client-go/listers/apps/v1"
corev1listers "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"github.com/google/go-containerregistry/pkg/authn/k8schain"
cachinginformers "github.com/knative/caching/pkg/client/informers/externalversions/caching/v1alpha1"
cachinglisters "github.com/knative/caching/pkg/client/listers/caching/v1alpha1"
"github.com/knative/pkg/apis/duck"
duckv1alpha1 "github.com/knative/pkg/apis/duck/v1alpha1"
"github.com/knative/pkg/configmap"
"github.com/knative/pkg/controller"
commonlogging "github.com/knative/pkg/logging"
"github.com/knative/pkg/tracker"
"github.com/knative/serving/pkg/apis/serving"
"github.com/knative/serving/pkg/apis/serving/v1alpha1"
painformers "github.com/knative/serving/pkg/client/informers/externalversions/autoscaling/v1alpha1"
servinginformers "github.com/knative/serving/pkg/client/informers/externalversions/serving/v1alpha1"
kpalisters "github.com/knative/serving/pkg/client/listers/autoscaling/v1alpha1"
listers "github.com/knative/serving/pkg/client/listers/serving/v1alpha1"
"github.com/knative/serving/pkg/network"
"github.com/knative/serving/pkg/reconciler"
"github.com/knative/serving/pkg/reconciler/v1alpha1/revision/config"
"go.uber.org/zap"
)
const (
controllerAgentName = "revision-controller"
)
type changed bool
const (
wasChanged changed = true
unchanged changed = false
)
type resolver interface {
Resolve(string, k8schain.Options, sets.String) (string, error)
}
type configStore interface {
ToContext(ctx context.Context) context.Context
WatchConfigs(w configmap.Watcher)
Load() *config.Config
}
// Reconciler implements controller.Reconciler for Revision resources.
type Reconciler struct {
*reconciler.Base
// lister indexes properties about Revision
revisionLister listers.RevisionLister
podAutoscalerLister kpalisters.PodAutoscalerLister
imageLister cachinglisters.ImageLister
deploymentLister appsv1listers.DeploymentLister
serviceLister corev1listers.ServiceLister
endpointsLister corev1listers.EndpointsLister
configMapLister corev1listers.ConfigMapLister
buildInformerFactory duck.InformerFactory
tracker tracker.Interface
resolver resolver
configStore configStore
}
// Check that our Reconciler implements controller.Reconciler
var _ controller.Reconciler = (*Reconciler)(nil)
// NewController initializes the controller and is called by the generated code
// Registers eventhandlers to enqueue events
// config - client configuration for talking to the apiserver
// si - informer factory shared across all controllers for listening to events and indexing resource properties
// queue - message queue for handling new events. unique to this controller.
func NewController(
opt reconciler.Options,
revisionInformer servinginformers.RevisionInformer,
podAutoscalerInformer painformers.PodAutoscalerInformer,
imageInformer cachinginformers.ImageInformer,
deploymentInformer appsv1informers.DeploymentInformer,
serviceInformer corev1informers.ServiceInformer,
endpointsInformer corev1informers.EndpointsInformer,
configMapInformer corev1informers.ConfigMapInformer,
buildInformerFactory duck.InformerFactory,
) *controller.Impl {
transport := http.DefaultTransport
if rt, err := newResolverTransport(k8sCertPath); err != nil {
opt.Logger.Errorf("Failed to create resolver transport: %v", err)
} else {
transport = rt
}
c := &Reconciler{
Base: reconciler.NewBase(opt, controllerAgentName),
revisionLister: revisionInformer.Lister(),
podAutoscalerLister: podAutoscalerInformer.Lister(),
imageLister: imageInformer.Lister(),
deploymentLister: deploymentInformer.Lister(),
serviceLister: serviceInformer.Lister(),
endpointsLister: endpointsInformer.Lister(),
configMapLister: configMapInformer.Lister(),
resolver: &digestResolver{
client: opt.KubeClientSet,
transport: transport,
},
}
impl := controller.NewImpl(c, c.Logger, "Revisions", reconciler.MustNewStatsReporter("Revisions", c.Logger))
// Set up an event handler for when the resource types of interest change
c.Logger.Info("Setting up event handlers")
revisionInformer.Informer().AddEventHandler(reconciler.Handler(impl.Enqueue))
endpointsInformer.Informer().AddEventHandler(reconciler.Handler(
impl.EnqueueLabelOfNamespaceScopedResource("", serving.RevisionLabelKey)))
deploymentInformer.Informer().AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controller.Filter(v1alpha1.SchemeGroupVersion.WithKind("Revision")),
Handler: reconciler.Handler(impl.EnqueueControllerOf),
})
podAutoscalerInformer.Informer().AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controller.Filter(v1alpha1.SchemeGroupVersion.WithKind("Revision")),
Handler: reconciler.Handler(impl.EnqueueControllerOf),
})
c.tracker = tracker.New(impl.EnqueueKey, opt.GetTrackerLease())
// We don't watch for changes to Image because we don't incorporate any of its
// properties into our own status and should work completely in the absence of
// a functioning Image controller.
configMapInformer.Informer().AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controller.Filter(v1alpha1.SchemeGroupVersion.WithKind("Revision")),
Handler: reconciler.Handler(impl.EnqueueControllerOf),
})
c.buildInformerFactory = newDuckInformerFactory(c.tracker, buildInformerFactory)
configsToResync := []interface{}{
&network.Config{},
&config.Observability{},
&config.Controller{},
}
resync := configmap.TypeFilter(configsToResync...)(func(string, interface{}) {
// Triggers syncs on all revisions when configuration
// changes
impl.GlobalResync(revisionInformer.Informer())
})
c.configStore = config.NewStore(c.Logger.Named("config-store"), resync)
c.configStore.WatchConfigs(opt.ConfigMapWatcher)
return impl
}
func KResourceTypedInformerFactory(opt reconciler.Options) duck.InformerFactory {
return &duck.TypedInformerFactory{
Client: opt.DynamicClientSet,
Type: &duckv1alpha1.KResource{},
ResyncPeriod: opt.ResyncPeriod,
StopChannel: opt.StopChannel,
}
}
func newDuckInformerFactory(t tracker.Interface, delegate duck.InformerFactory) duck.InformerFactory {
return &duck.CachedInformerFactory{
Delegate: &duck.EnqueueInformerFactory{
Delegate: delegate,
EventHandler: reconciler.Handler(t.OnChanged),
},
}
}
// Reconcile compares the actual state with the desired, and attempts to
// converge the two. It then updates the Status block of the Revision resource
// with the current status of the resource.
func (c *Reconciler) Reconcile(ctx context.Context, key string) error {
// Convert the namespace/name string into a distinct namespace and name
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
c.Logger.Errorf("invalid resource key: %s", key)
return nil
}
logger := commonlogging.FromContext(ctx)
logger.Info("Running reconcile Revision")
ctx = c.configStore.ToContext(ctx)
// Get the Revision resource with this namespace/name
original, err := c.revisionLister.Revisions(namespace).Get(name)
// The resource may no longer exist, in which case we stop processing.
if apierrs.IsNotFound(err) {
logger.Errorf("revision %q in work queue no longer exists", key)
return nil
} else if err != nil {
return err
}
// Don't modify the informer's copy.
rev := original.DeepCopy()
// Reconcile this copy of the revision and then write back any status
// updates regardless of whether the reconciliation errored out.
err = c.reconcile(ctx, rev)
if equality.Semantic.DeepEqual(original.Status, rev.Status) {
// If we didn't change anything then don't call updateStatus.
// This is important because the copy we loaded from the informer's
// cache may be stale and we don't want to overwrite a prior update
// to status with this stale state.
} else if _, err := c.updateStatus(rev); err != nil {
logger.Warnw("Failed to update revision status", zap.Error(err))
c.Recorder.Eventf(rev, corev1.EventTypeWarning, "UpdateFailed",
"Failed to update status for Revision %q: %v", rev.Name, err)
return err
}
if err != nil {
c.Recorder.Event(rev, corev1.EventTypeWarning, "InternalError", err.Error())
}
return err
}
func (c *Reconciler) reconcileBuild(ctx context.Context, rev *v1alpha1.Revision) error {
buildRef := rev.BuildRef()
if buildRef == nil {
rev.Status.PropagateBuildStatus(duckv1alpha1.Status{
Conditions: []duckv1alpha1.Condition{{
Type: duckv1alpha1.ConditionSucceeded,
Status: corev1.ConditionTrue,
Reason: "NoBuild",
}},
})
return nil
}
logger := commonlogging.FromContext(ctx)
if err := c.tracker.Track(*buildRef, rev); err != nil {
logger.Errorf("Error tracking build '%+v' for Revision %q: %+v", buildRef, rev.Name, err)
return err
}
gvr, _ := meta.UnsafeGuessKindToResource(buildRef.GroupVersionKind())
_, lister, err := c.buildInformerFactory.Get(gvr)
if err != nil {
logger.Errorf("Error getting a lister for a builds resource '%+v': %+v", gvr, err)
return err
}
buildObj, err := lister.ByNamespace(rev.Namespace).Get(buildRef.Name)
if err != nil {
logger.Errorf("Error fetching Build %q for Revision %q: %v", buildRef.Name, rev.Name, err)
return err
}
build := buildObj.(*duckv1alpha1.KResource)
before := rev.Status.GetCondition(v1alpha1.RevisionConditionBuildSucceeded)
rev.Status.PropagateBuildStatus(build.Status)
after := rev.Status.GetCondition(v1alpha1.RevisionConditionBuildSucceeded)
if before.Status != after.Status {
// Create events when the Build result is in.
if after.Status == corev1.ConditionTrue {
c.Recorder.Event(rev, corev1.EventTypeNormal, "BuildSucceeded", after.Message)
} else if after.Status == corev1.ConditionFalse {
c.Recorder.Event(rev, corev1.EventTypeWarning, "BuildFailed", after.Message)
}
}
return nil
}
func (c *Reconciler) reconcileDigest(ctx context.Context, rev *v1alpha1.Revision) error {
// The image digest has already been resolved.
if rev.Status.ImageDigest != "" {
return nil
}
cfgs := config.FromContext(ctx)
opt := k8schain.Options{
Namespace: rev.Namespace,
ServiceAccountName: rev.Spec.ServiceAccountName,
// ImagePullSecrets: Not possible via RevisionSpec, since we
// don't expose such a field.
}
digest, err := c.resolver.Resolve(rev.Spec.Container.Image, opt, cfgs.Controller.RegistriesSkippingTagResolving)
if err != nil {
rev.Status.MarkContainerMissing(v1alpha1.RevisionContainerMissingMessage(rev.Spec.Container.Image, err.Error()))
return err
}
rev.Status.ImageDigest = digest
return nil
}
func (c *Reconciler) reconcile(ctx context.Context, rev *v1alpha1.Revision) error {
logger := commonlogging.FromContext(ctx)
if rev.GetDeletionTimestamp() != nil {
return nil
}
readyBeforeReconcile := rev.Status.IsReady()
// We may be reading a version of the object that was stored at an older version
// and may not have had all of the assumed defaults specified. This won't result
// in this getting written back to the API Server, but lets downstream logic make
// assumptions about defaulting.
rev.SetDefaults(ctx)
rev.Status.InitializeConditions()
c.updateRevisionLoggingURL(ctx, rev)
if err := c.reconcileBuild(ctx, rev); err != nil {
return err
}
bc := rev.Status.GetCondition(v1alpha1.RevisionConditionBuildSucceeded)
if bc == nil || bc.Status == corev1.ConditionTrue {
// There is no build, or the build completed successfully.
phases := []struct {
name string
f func(context.Context, *v1alpha1.Revision) error
}{{
name: "image digest",
f: c.reconcileDigest,
}, {
name: "user deployment",
f: c.reconcileDeployment,
}, {
name: "image cache",
f: c.reconcileImageCache,
}, {
name: "user k8s service",
f: c.reconcileService,
}, {
// Ensures our namespace has the configuration for the fluentd sidecar.
name: "fluentd configmap",
f: c.reconcileFluentdConfigMap,
}, {
name: "KPA",
f: c.reconcileKPA,
}}
for _, phase := range phases {
if err := phase.f(ctx, rev); err != nil {
logger.Errorw("Failed to reconcile", zap.String("phase", phase.name), zap.Error(err))
return err
}
}
}
readyAfterReconcile := rev.Status.IsReady()
if !readyBeforeReconcile && readyAfterReconcile {
c.Recorder.Event(rev, corev1.EventTypeNormal, "RevisionReady",
"Revision becomes ready upon all resources being ready")
}
rev.Status.ObservedGeneration = rev.Generation
return nil
}
func (c *Reconciler) updateRevisionLoggingURL(
ctx context.Context,
rev *v1alpha1.Revision,
) {
config := config.FromContext(ctx)
if config.Observability.LoggingURLTemplate == "" {
return
}
uid := string(rev.UID)
rev.Status.LogURL = strings.Replace(
config.Observability.LoggingURLTemplate,
"${REVISION_UID}", uid, -1)
}
func (c *Reconciler) updateStatus(desired *v1alpha1.Revision) (*v1alpha1.Revision, error) {
rev, err := c.revisionLister.Revisions(desired.Namespace).Get(desired.Name)
if err != nil {
return nil, err
}
// If there's nothing to update, just return.
if reflect.DeepEqual(rev.Status, desired.Status) {
return rev, nil
}
// Don't modify the informers copy
existing := rev.DeepCopy()
existing.Status = desired.Status
return c.ServingClientSet.ServingV1alpha1().Revisions(desired.Namespace).UpdateStatus(existing)
}