annotator-controller/main.go at main · amandahla/annotator-controller · GitHub

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package main

import (
	"context"
	"fmt"
	"os"
	"strings"

	corev1 "k8s.io/api/core/v1"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/client/config"
	"sigs.k8s.io/controller-runtime/pkg/controller"
	"sigs.k8s.io/controller-runtime/pkg/event"
	"sigs.k8s.io/controller-runtime/pkg/handler"
	"sigs.k8s.io/controller-runtime/pkg/log"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	"sigs.k8s.io/controller-runtime/pkg/manager"
	"sigs.k8s.io/controller-runtime/pkg/predicate"
	"sigs.k8s.io/controller-runtime/pkg/source"
)

func init() {
	log.SetLogger(zap.New())
}

func main() {
	cfg := config.GetConfigOrDie()
	fmt.Println("setting the manager")
	mgr, err := manager.New(cfg, manager.Options{})
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	fmt.Println("registering the controller")
	c, err := controller.New("annotator-controller", mgr, controller.Options{
		Reconciler: &reconcilePod{client: mgr.GetClient()},
	})
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	fmt.Println("watching pods")
	err = c.Watch(source.Kind(mgr.GetCache(), &corev1.Pod{}, &handler.TypedEnqueueRequestForObject[*corev1.Pod]{}, typedPodPredicates()))
	// err = c.Watch(source.Kind(mgr.GetCache(), &corev1.Pod{}, &handler.TypedEnqueueRequestForObject[*corev1.Pod]{}))
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	fmt.Println("starting the manager")
	err = mgr.Start(context.Background())
	if err != nil {
		fmt.Fprintf(os.Stderr, "problem running manager: %v\n", err)
		os.Exit(1)
	}
}

func GetConfigAnnotation() (string, error) {
	cfg := config.GetConfigOrDie()
	cl, err := client.New(cfg, client.Options{})
	cm := &corev1.ConfigMap{}
	err = cl.Get(context.Background(), client.ObjectKey{
		Name:      "annotation-config",
		Namespace: "default",
	}, cm)
	if err != nil {
		return "", err
	}
	annotationKey := cm.Data["annotation_key"]
	if annotationKey == "" {
		return "", nil
	}
	return annotationKey, nil
}

func typedPodPredicates() predicate.TypedFuncs[*corev1.Pod] {
	return predicate.TypedFuncs[*corev1.Pod]{
		CreateFunc: func(e event.TypedCreateEvent[*corev1.Pod]) bool {
			return true
		},
		UpdateFunc: func(e event.TypedUpdateEvent[*corev1.Pod]) bool {
			old := e.ObjectOld
			new := e.ObjectNew
			annotationKey, err := GetConfigAnnotation()
			if err != nil {
				return true
			}
			oldVal := ""
			if old.Annotations != nil {
				oldVal = old.Annotations[annotationKey]
			}

			newVal := ""
			if new.Annotations != nil {
				newVal = new.Annotations[annotationKey]
			}

			// Only reconcile if the value changed, or if it's still missing
			if strings.EqualFold(oldVal, newVal) && strings.EqualFold(newVal, "true") {
				return false
			}

			return true
		},
		DeleteFunc: func(e event.TypedDeleteEvent[*corev1.Pod]) bool {
			return true
		},
		GenericFunc: func(e event.TypedGenericEvent[*corev1.Pod]) bool {
			return false
		},
	}
}