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pod_controller.go
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pod_controller.go
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// Copyright 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 kube
import (
"time"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/tools/cache"
"istio.io/istio/pkg/kube"
"istio.io/istio/pkg/kube/controllers"
"istio.io/istio/pkg/queue"
"istio.io/istio/pkg/test/framework/components/echo"
)
var _ cache.Controller = &podController{}
type podHandler func(pod *corev1.Pod) error
type podHandlers struct {
added podHandler
updated podHandler
deleted podHandler
}
type podController struct {
q queue.Instance
informer cache.Controller
}
func newPodController(cfg echo.Config, handlers podHandlers) *podController {
s := newPodSelector(cfg)
podListWatch := cache.NewFilteredListWatchFromClient(cfg.Cluster.Kube().CoreV1().RESTClient(),
"pods",
cfg.Namespace.Name(),
func(options *metav1.ListOptions) {
if len(options.LabelSelector) > 0 {
options.LabelSelector += ","
}
options.LabelSelector += s.String()
})
q := queue.NewQueue(1 * time.Second)
_, informer := cache.NewInformer(podListWatch, &corev1.Pod{}, 0, controllers.EventHandler[*corev1.Pod]{
AddFunc: func(pod *corev1.Pod) {
q.Push(func() error {
return handlers.added(pod)
})
},
UpdateFunc: func(old, cur *corev1.Pod) {
q.Push(func() error {
if old.GetResourceVersion() != cur.GetResourceVersion() {
return handlers.updated(cur)
}
return nil
})
},
DeleteFunc: func(pod *corev1.Pod) {
q.Push(func() error {
return handlers.deleted(pod)
})
},
})
return &podController{
q: q,
informer: informer,
}
}
func (c *podController) Run(stop <-chan struct{}) {
go c.informer.Run(stop)
kube.WaitForCacheSync("pod controller", stop, c.informer.HasSynced)
c.q.Run(stop)
}
func (c *podController) HasSynced() bool {
return c.q.HasSynced()
}
func (c *podController) WaitForSync(stopCh <-chan struct{}) bool {
return cache.WaitForNamedCacheSync("echo", stopCh, c.informer.HasSynced)
}
func (c *podController) LastSyncResourceVersion() string {
return c.informer.LastSyncResourceVersion()
}