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endpoint.go
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endpoint.go
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// Copyright 2018 Istio 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 validation
import (
v1 "k8s.io/api/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
)
type endpointReadiness int
const (
endpointCheckShutdown endpointReadiness = iota
endpointCheckReady
endpointCheckNotReady
)
func endpointReady(store cache.KeyGetter, queue workqueue.RateLimitingInterface, namespace, name string) endpointReadiness {
key, quit := queue.Get()
if quit {
return endpointCheckShutdown
}
defer queue.Done(key)
item, exists, err := store.GetByKey(key.(string))
if err != nil || !exists {
return endpointCheckNotReady
}
endpoints, ok := item.(*v1.Endpoints)
if !ok {
return endpointCheckNotReady
}
if len(endpoints.Subsets) == 0 {
scope.Warnf("%s/%v endpoint not ready: no subsets", namespace, name)
return endpointCheckNotReady
}
for _, subset := range endpoints.Subsets {
if len(subset.Addresses) > 0 {
return endpointCheckReady
}
}
scope.Warnf("%s/%v endpoint not ready: no ready addresses", namespace, name)
return endpointCheckNotReady
}
func (wh *Webhook) waitForEndpointReady(stopCh <-chan struct{}) (shutdown bool) {
scope.Infof("Checking if %s/%s is ready before registering webhook configuration ",
wh.deploymentAndServiceNamespace, wh.deploymentName)
defer func() {
if shutdown {
scope.Info("Endpoint readiness check stopped - controller shutting down")
} else {
scope.Infof("Endpoint %s/%s is ready", wh.deploymentAndServiceNamespace, wh.deploymentName)
}
}()
queue := workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter())
defer queue.ShutDown()
store, controller := cache.NewInformer(
wh.createInformerEndpointSource(wh.clientset, wh.deploymentAndServiceNamespace, wh.serviceName),
&v1.Endpoints{},
0,
cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
if key, err := cache.MetaNamespaceKeyFunc(obj); err == nil {
queue.Add(key)
}
},
UpdateFunc: func(prev, curr interface{}) {
prevObj := prev.(*v1.Endpoints)
currObj := curr.(*v1.Endpoints)
if prevObj.ResourceVersion != currObj.ResourceVersion {
if key, err := cache.MetaNamespaceKeyFunc(curr); err == nil {
queue.Add(key)
}
}
},
DeleteFunc: func(obj interface{}) {
if key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj); err == nil {
queue.Add(key)
}
},
},
)
controllerStopCh := make(chan struct{})
defer close(controllerStopCh)
go controller.Run(controllerStopCh)
if !cache.WaitForCacheSync(stopCh, controller.HasSynced) {
scope.Errorf("wait for cache sync failed")
return true
}
for {
select {
case <-stopCh:
return true
default:
ready := endpointReady(store, queue, wh.deploymentAndServiceNamespace, wh.serviceName)
switch ready {
case endpointCheckShutdown:
return true
case endpointCheckReady:
return false
case endpointCheckNotReady:
// continue waiting for endpoint to be ready
}
}
}
}