/
controller.go
141 lines (110 loc) · 2.76 KB
/
controller.go
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package controller
import (
"context"
"fmt"
"time"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/apis/meta/v1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog"
)
type Runner interface {
Run(workers int, stopCh <-chan struct{})
}
func New(name string, sync KeySyncer, opts ...Option) Runner {
c := &controller{
name: name,
sync: sync,
}
WithRateLimiter(workqueue.DefaultControllerRateLimiter())(c)
for _, opt := range opts {
opt(c)
}
return c
}
type controller struct {
name string
sync KeySyncer
queue workqueue.RateLimitingInterface
maxRetries int
run bool
runOpts []Option
cacheSyncs []cache.InformerSynced
}
func (c *controller) Run(workers int, stopCh <-chan struct{}) {
defer utilruntime.HandleCrash(crash)
defer c.queue.ShutDown()
klog.Infof("Starting %s", c.name)
defer klog.Infof("Shutting down %s", c.name)
c.run = true
for _, opt := range c.runOpts {
opt(c)
}
if !c.waitForCacheSyncWithTimeout() {
panic(die(fmt.Sprintf("%s: timed out waiting for caches to sync", c.name)))
}
for i := 0; i < workers; i++ {
go wait.Until(c.runWorker, time.Second, stopCh)
}
<-stopCh
}
func (c *controller) waitForCacheSyncWithTimeout() bool {
// prevent us from blocking forever due to a broken informer
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
defer cancel()
return cache.WaitForCacheSync(ctx.Done(), c.cacheSyncs...)
}
func (c *controller) add(filter ParentFilter, object v1.Object) {
namespace, name := filter.Parent(object)
c.addKey(namespace, name)
}
func (c *controller) addKey(namespace, name string) {
qKey := queueKey{namespace: namespace, name: name}
c.queue.Add(qKey)
}
func (c *controller) runWorker() {
for c.processNextWorkItem() {
}
}
func (c *controller) processNextWorkItem() bool {
key, quit := c.queue.Get()
if quit {
return false
}
qKey := key.(queueKey)
defer c.queue.Done(qKey)
err := c.handleSync(qKey)
c.handleKey(qKey, err)
return true
}
func (c *controller) handleSync(key queueKey) error {
obj, err := c.sync.Key(key.namespace, key.name)
if errors.IsNotFound(err) {
return nil
}
if err != nil {
return err
}
return c.sync.Sync(obj)
}
func (c *controller) handleKey(key queueKey, err error) {
if err == nil {
c.queue.Forget(key)
return
}
retryForever := c.maxRetries <= 0
if retryForever || c.queue.NumRequeues(key) < c.maxRetries {
utilruntime.HandleError(fmt.Errorf("%v failed with: %v", key, err))
c.queue.AddRateLimited(key)
return
}
utilruntime.HandleError(fmt.Errorf("dropping key %v out of the queue: %v", key, err))
c.queue.Forget(key)
}
type queueKey struct {
namespace string
name string
}