/
main.go
81 lines (71 loc) · 2.36 KB
/
main.go
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package main
import (
"context"
"fmt"
"strconv"
"time"
"github.com/usysrc/feature-flag-operator/internal/ffo"
appsv1 "k8s.io/api/apps/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
)
func main() {
// Initialize Kubernetes client
config, err := clientcmd.BuildConfigFromFlags("", "")
if err != nil {
panic(err.Error())
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
panic(err.Error())
}
// Configure Feature Flag Source
flipt := ffo.NewFliptClient("localhost:3122")
// Watch for relevant resources (e.g., Deployments, Pods)
informerFactory := informers.NewSharedInformerFactory(clientset, time.Second*30)
deploymentInformer := informerFactory.Apps().V1().Deployments()
// Define reconciliation logic
deploymentInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
deployment := obj.(*appsv1.Deployment)
// Fetch feature flags from API
flags := fetchFeatureFlags(flipt)
// Inject feature flags into deployment
injectFeatureFlags(deployment, flags)
// Update deployment in Kubernetes cluster
updateDeployment(clientset, deployment)
},
})
// Start informers
stopCh := make(chan struct{})
informerFactory.Start(stopCh)
<-stopCh
}
func fetchFeatureFlags(getter ffo.FlagGetter) ffo.FeatureFlags {
flags, err := getter.FlagList()
if err != nil {
panic(err.Error())
}
return ffo.FeatureFlags{
Flags: flags,
}
}
func injectFeatureFlags(deployment *appsv1.Deployment, flags ffo.FeatureFlags) {
// Logic to inject feature flags into Kubernetes resources
// TODO: limit to certain annotations or implement more than just annotations
for _, flag := range flags.Flags {
deployment.Spec.Template.ObjectMeta.Annotations[flag.Name] = flag.Value
deployment.Spec.Template.ObjectMeta.Annotations["enabled-"+flag.Name] = strconv.FormatBool(flag.Enabled)
}
}
func updateDeployment(clientset *kubernetes.Clientset, deployment *appsv1.Deployment) {
// Logic to update deployment in Kubernetes cluster
_, err := clientset.AppsV1().Deployments(deployment.Namespace).Update(context.TODO(), deployment, metav1.UpdateOptions{})
if err != nil {
panic(fmt.Errorf("failed to update deployment: %v", err))
}
fmt.Println("Updated deployment:", deployment.Name)
}