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main.go
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main.go
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package main
import (
"context"
"fmt"
"os"
"path/filepath"
"time"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/kubernetes"
_ "k8s.io/client-go/plugin/pkg/client/auth"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
"github.com/adevjoe/kooper/v2/controller"
"github.com/adevjoe/kooper/v2/log"
kooperlogrus "github.com/adevjoe/kooper/v2/log/logrus"
)
func run() error {
// Initialize logger.
logger := kooperlogrus.New(logrus.NewEntry(logrus.New())).
WithKV(log.KV{"example": "config-custom-controller"})
// Get k8s client.
k8scfg, err := rest.InClusterConfig()
if err != nil {
// No in cluster? letr's try locally
kubehome := filepath.Join(homedir.HomeDir(), ".kube", "config")
k8scfg, err = clientcmd.BuildConfigFromFlags("", kubehome)
if err != nil {
return fmt.Errorf("error loading kubernetes configuration: %w", err)
}
}
k8scli, err := kubernetes.NewForConfig(k8scfg)
if err != nil {
return fmt.Errorf("error creating kubernetes client: %w", err)
}
// Create our retriever so the controller knows how to get/listen for pod events.
retr := controller.MustRetrieverFromListerWatcher(&cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return k8scli.CoreV1().Pods("").List(context.TODO(), options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return k8scli.CoreV1().Pods("").Watch(context.TODO(), options)
},
})
// Our domain logic that will print every add/sync/update and delete event we .
hand := controller.HandlerFunc(func(_ context.Context, obj runtime.Object) error {
pod := obj.(*corev1.Pod)
logger.Infof("Pod added: %s/%s", pod.Namespace, pod.Name)
return nil
})
// Create the controller with custom configuration.
cfg := &controller.Config{
Name: "config-custom-controller",
Handler: hand,
Retriever: retr,
Logger: logger,
ProcessingJobRetries: 5,
ResyncInterval: 45 * time.Second,
ConcurrentWorkers: 1,
}
ctrl, err := controller.New(cfg)
if err != nil {
return fmt.Errorf("could not create controller: %w", err)
}
// Start our controller.
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
err = ctrl.Run(ctx)
if err != nil {
return fmt.Errorf("error running controller: %w", err)
}
return nil
}
func main() {
err := run()
if err != nil {
fmt.Fprintf(os.Stderr, "error running app: %s", err)
os.Exit(1)
}
os.Exit(0)
}