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Implement Application controller boilerplate (#2)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package controller | ||
|
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| import ( | ||
| "context" | ||
|
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| appclientset "github.com/argoproj/argo-cd/pkg/client/clientset/versioned" | ||
| appinformers "github.com/argoproj/argo-cd/pkg/client/informers/externalversions" | ||
| log "github.com/sirupsen/logrus" | ||
|
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| "time" | ||
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| "k8s.io/apimachinery/pkg/util/runtime" | ||
| "k8s.io/apimachinery/pkg/util/wait" | ||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/tools/cache" | ||
| "k8s.io/client-go/util/workqueue" | ||
| ) | ||
|
|
||
| const ( | ||
| appResyncPeriod = 10 * time.Minute | ||
| ) | ||
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| // ApplicationController is the controller for application resources. | ||
| type ApplicationController struct { | ||
| kubeclientset kubernetes.Interface | ||
| applicationclientset appclientset.Interface | ||
| appQueue workqueue.RateLimitingInterface | ||
|
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| appInformer cache.SharedIndexInformer | ||
| } | ||
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| // NewApplicationController creates new instance of ApplicationController. | ||
| func NewApplicationController(kubeclientset kubernetes.Interface, applicationclientset appclientset.Interface) *ApplicationController { | ||
| appQueue := workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter()) | ||
| return &ApplicationController{ | ||
| kubeclientset: kubeclientset, | ||
| applicationclientset: applicationclientset, | ||
| appQueue: appQueue, | ||
| appInformer: newApplicationInformer(applicationclientset, appQueue), | ||
| } | ||
| } | ||
|
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| // Run starts the Application CRD controller. | ||
| func (ctrl *ApplicationController) Run(ctx context.Context, appWorkers int) { | ||
| defer runtime.HandleCrash() | ||
| defer ctrl.appQueue.ShutDown() | ||
|
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| go ctrl.appInformer.Run(ctx.Done()) | ||
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| if !cache.WaitForCacheSync(ctx.Done(), ctrl.appInformer.HasSynced) { | ||
| log.Error("Timed out waiting for caches to sync") | ||
| return | ||
| } | ||
|
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| for i := 0; i < appWorkers; i++ { | ||
| go wait.Until(ctrl.runWorker, time.Second, ctx.Done()) | ||
| } | ||
|
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| <-ctx.Done() | ||
| } | ||
|
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| func (ctrl *ApplicationController) processNextItem() bool { | ||
| appKey, shutdown := ctrl.appQueue.Get() | ||
| defer ctrl.appQueue.Done(appKey) | ||
| if shutdown { | ||
| return false | ||
| } | ||
| return true | ||
| } | ||
|
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| func (ctrl *ApplicationController) runWorker() { | ||
| for ctrl.processNextItem() { | ||
| } | ||
| } | ||
|
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| func newApplicationInformer(appclientset appclientset.Interface, appQueue workqueue.RateLimitingInterface) cache.SharedIndexInformer { | ||
| appInformerFactory := appinformers.NewSharedInformerFactory( | ||
| appclientset, | ||
| appResyncPeriod, | ||
| ) | ||
| informer := appInformerFactory.Argoproj().V1alpha1().Applications().Informer() | ||
| informer.AddEventHandler( | ||
| cache.ResourceEventHandlerFuncs{ | ||
| AddFunc: func(obj interface{}) { | ||
| key, err := cache.MetaNamespaceKeyFunc(obj) | ||
| if err == nil { | ||
| appQueue.Add(key) | ||
| } | ||
| }, | ||
| UpdateFunc: func(old, new interface{}) { | ||
| key, err := cache.MetaNamespaceKeyFunc(new) | ||
| if err == nil { | ||
| appQueue.Add(key) | ||
| } | ||
| }, | ||
| DeleteFunc: func(obj interface{}) { | ||
| // IndexerInformer uses a delta queue, therefore for deletes we have to use this | ||
| // key function. | ||
| key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj) | ||
| if err == nil { | ||
| appQueue.Add(key) | ||
| } | ||
| }, | ||
| }, | ||
| ) | ||
| return informer | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| package main | ||
|
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "github.com/argoproj/argo-cd/application/controller" | ||
| "github.com/argoproj/argo-cd/cmd/argocd/commands" | ||
| appclientset "github.com/argoproj/argo-cd/pkg/client/clientset/versioned" | ||
| "github.com/spf13/cobra" | ||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/tools/clientcmd" | ||
| "os" | ||
| ) | ||
|
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| const ( | ||
| // CLIName is the name of the CLI | ||
| cliName = "application-controller" | ||
| ) | ||
|
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| func newCommand() *cobra.Command { | ||
| var ( | ||
| kubeConfigOverrides clientcmd.ConfigOverrides | ||
| kubeConfigPath string | ||
| ) | ||
| var command = cobra.Command{ | ||
| Use: cliName, | ||
| Short: "application-controller is a controller to operate on applications CRD", | ||
| Run: func(c *cobra.Command, args []string) { | ||
| kubeConfig := commands.GetKubeConfig(kubeConfigPath, kubeConfigOverrides) | ||
|
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| kubeClient := kubernetes.NewForConfigOrDie(kubeConfig) | ||
| appClient := appclientset.NewForConfigOrDie(kubeConfig) | ||
|
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| appController := controller.NewApplicationController(kubeClient, appClient) | ||
|
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| ctx, cancel := context.WithCancel(context.Background()) | ||
| defer cancel() | ||
|
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| go appController.Run(ctx, 1) | ||
| // Wait forever | ||
| select {} | ||
| }, | ||
| } | ||
|
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| command.Flags().StringVar(&kubeConfigPath, "kubeconfig", "", "Path to the config file to use for CLI requests.") | ||
| kubeConfigOverrides = clientcmd.ConfigOverrides{} | ||
| clientcmd.BindOverrideFlags(&kubeConfigOverrides, command.Flags(), clientcmd.RecommendedConfigOverrideFlags("")) | ||
|
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| return &command | ||
| } | ||
|
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| func main() { | ||
| if err := newCommand().Execute(); err != nil { | ||
| fmt.Println(err) | ||
| os.Exit(1) | ||
| } | ||
| } |
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