123 lines
3 KiB
Go
123 lines
3 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package task
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import (
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"fmt"
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"time"
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"github.com/golang/glog"
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"k8s.io/kubernetes/pkg/client/cache"
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"k8s.io/kubernetes/pkg/util/wait"
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"k8s.io/kubernetes/pkg/util/workqueue"
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)
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var (
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keyFunc = cache.DeletionHandlingMetaNamespaceKeyFunc
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)
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// Queue manages a work queue through an independent worker that
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// invokes the given sync function for every work item inserted.
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type Queue struct {
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// queue is the work queue the worker polls
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queue workqueue.RateLimitingInterface
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// sync is called for each item in the queue
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sync func(interface{}) error
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// workerDone is closed when the worker exits
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workerDone chan struct{}
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fn func(obj interface{}) (interface{}, error)
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}
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// Run ...
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func (t *Queue) Run(period time.Duration, stopCh <-chan struct{}) {
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wait.Until(t.worker, period, stopCh)
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}
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// Enqueue enqueues ns/name of the given api object in the task queue.
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func (t *Queue) Enqueue(obj interface{}) {
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glog.V(3).Infof("queuing item %v", obj)
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key, err := t.fn(obj)
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if err != nil {
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glog.Errorf("%v", err)
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return
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}
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t.queue.Add(key)
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}
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func (t *Queue) defaultKeyFunc(obj interface{}) (interface{}, error) {
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key, err := keyFunc(obj)
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if err != nil {
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return "", fmt.Errorf("could not get key for object %+v: %v", obj, err)
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}
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return key, nil
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}
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// worker processes work in the queue through sync.
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func (t *Queue) worker() {
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for {
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key, quit := t.queue.Get()
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if quit {
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close(t.workerDone)
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return
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}
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glog.V(3).Infof("syncing %v", key)
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if err := t.sync(key); err != nil {
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glog.Warningf("requeuing %v, err %v", key, err)
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t.queue.AddRateLimited(key)
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} else {
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t.queue.Forget(key)
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}
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t.queue.Done(key)
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}
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}
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// Shutdown shuts down the work queue and waits for the worker to ACK
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func (t *Queue) Shutdown() {
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t.queue.ShutDown()
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<-t.workerDone
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}
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// IsShuttingDown returns if the method Shutdown was invoked
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func (t *Queue) IsShuttingDown() bool {
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return t.queue.ShuttingDown()
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}
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// NewTaskQueue creates a new task queue with the given sync function.
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// The sync function is called for every element inserted into the queue.
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func NewTaskQueue(syncFn func(interface{}) error) *Queue {
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return NewCustomTaskQueue(syncFn, nil)
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}
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// NewCustomTaskQueue ...
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func NewCustomTaskQueue(syncFn func(interface{}) error, fn func(interface{}) (interface{}, error)) *Queue {
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q := &Queue{
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queue: workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter()),
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sync: syncFn,
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workerDone: make(chan struct{}),
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fn: fn,
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}
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if fn == nil {
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q.fn = q.defaultKeyFunc
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}
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return q
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}
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