/
triggeruninstall.go
229 lines (179 loc) · 6.08 KB
/
triggeruninstall.go
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package uninstall
import (
"context"
"errors"
"flag"
"fmt"
"time"
"github.com/go-logr/zapr"
"github.com/spf13/pflag"
"github.com/stolostron/go-log-utils/zaputil"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/klog/v2"
policyv1 "open-cluster-management.io/governance-policy-propagator/api/v1"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client/config"
)
var (
deploymentName string
deploymentNamespace string
policyNamespace string
timeoutSeconds uint
)
var triggerLog = ctrl.Log.WithName("trigger-uninstall")
const AnnotationKey = "policy.open-cluster-management.io/uninstalling"
//+kubebuilder:rbac:groups=policy.open-cluster-management.io,resources=policies,verbs=deletecollection;
// Trigger adds the uninstallation annotation to the Deployment, then deletes all the policies.
// It will return nil only when all the policies are gone.
// It takes command line arguments to configure itself.
func Trigger(args []string) error {
if err := parseUninstallFlags(args); err != nil {
return err
}
triggerLog.Info("Triggering uninstallation preparation")
terminatingCtx := ctrl.SetupSignalHandler()
ctx, cancelCtx := context.WithTimeout(terminatingCtx, time.Duration(timeoutSeconds)*time.Second)
defer cancelCtx()
// Get a config to talk to the apiserver
config, err := config.GetConfig()
if err != nil {
return err
}
client := kubernetes.NewForConfigOrDie(config)
dynamicClient := dynamic.NewForConfigOrDie(config)
err = setUninstallAnnotation(ctx, client)
if err != nil {
return err
}
// Give the running controllers some time to switch to uninstall mode,
// to try and reduce the number of conflicts and retries while deleting policies.
time.Sleep(5 * time.Second)
err = deletePolicies(ctx, dynamicClient)
if err != nil {
return err
}
triggerLog.Info("Uninstallation preparation complete")
return nil
}
func parseUninstallFlags(args []string) error {
triggerUninstallFlagSet := pflag.NewFlagSet("trigger-uninstall", pflag.ExitOnError)
triggerUninstallFlagSet.StringVar(
&deploymentName,
"deployment-name",
"governance-policy-framework-addon",
"The name of the controller Deployment object",
)
triggerUninstallFlagSet.StringVar(
&deploymentNamespace,
"deployment-namespace",
"open-cluster-management-agent-addon",
"The namespace of the controller Deployment object",
)
triggerUninstallFlagSet.StringVar(
&policyNamespace, "policy-namespace", "", "The namespace where the Policy objects are stored",
)
triggerUninstallFlagSet.UintVar(
&timeoutSeconds, "timeout-seconds", 300, "The number of seconds before the operation is canceled",
)
triggerUninstallFlagSet.AddGoFlagSet(flag.CommandLine)
err := triggerUninstallFlagSet.Parse(args)
if err != nil {
return err
}
zflags := zaputil.FlagConfig{
LevelName: "log-level",
EncoderName: "log-encoder",
}
zflags.Bind(flag.CommandLine)
klog.InitFlags(flag.CommandLine)
ctrlZap, err := zflags.BuildForCtrl()
if err != nil {
panic(fmt.Sprintf("Failed to build zap logger for controller: %v", err))
}
ctrl.SetLogger(zapr.NewLogger(ctrlZap))
klogZap, err := zaputil.BuildForKlog(zflags.GetConfig(), flag.CommandLine)
if err != nil {
triggerLog.Error(err, "Failed to build zap logger for klog, those logs will not go through zap")
} else {
klog.SetLogger(zapr.NewLogger(klogZap).WithName("klog"))
}
if deploymentName == "" || deploymentNamespace == "" || policyNamespace == "" {
return errors.New("--deployment-name, --deployment-namespace, --policy-namespace must all have values")
}
if timeoutSeconds < 30 {
return errors.New("--timeout-seconds must be set to at least 30 seconds")
}
return nil
}
func setUninstallAnnotation(ctx context.Context, client *kubernetes.Clientset) error {
triggerLog.Info("Annotating the deployment with " + AnnotationKey + " = true")
for {
var err error
select {
case <-ctx.Done():
return fmt.Errorf("context canceled before the uninstallation preparation was complete")
default:
}
deploymentRsrc := client.AppsV1().Deployments(deploymentNamespace)
deployment, err := deploymentRsrc.Get(ctx, deploymentName, metav1.GetOptions{})
if err != nil {
return err
}
annotations := deployment.GetAnnotations()
annotations[AnnotationKey] = "true"
deployment.SetAnnotations(annotations)
_, err = deploymentRsrc.Update(ctx, deployment, metav1.UpdateOptions{})
if err != nil {
if k8serrors.IsServerTimeout(err) || k8serrors.IsTimeout(err) || k8serrors.IsConflict(err) {
triggerLog.Error(err, "Retrying setting the Deployment uninstall annotation due to error")
continue
}
return err
}
break
}
return nil
}
func deletePolicies(ctx context.Context, dynamicClient dynamic.Interface) error {
policyGVR := schema.GroupVersionResource{
Group: policyv1.GroupVersion.Group,
Version: policyv1.GroupVersion.Version,
Resource: "policies",
}
triggerLog.Info("Deleting all policies from the cluster")
policyInterface := dynamicClient.Resource(policyGVR).Namespace(policyNamespace)
for {
select {
case <-ctx.Done():
return fmt.Errorf("context canceled before the uninstallation preparation was complete")
default:
}
policies, err := policyInterface.List(ctx, metav1.ListOptions{})
if err != nil {
if k8serrors.IsServerTimeout(err) || k8serrors.IsTimeout(err) {
triggerLog.Error(err, "Unable to list policy objects, retrying.")
continue
}
return err
}
switch len(policies.Items) {
case 0:
triggerLog.Info("No policies found.")
return nil
case 1:
triggerLog.Info("Found 1 policy.")
default:
triggerLog.Info(fmt.Sprintf("Found %v policies.", len(policies.Items)))
}
err = policyInterface.DeleteCollection(ctx, metav1.DeleteOptions{}, metav1.ListOptions{})
if err != nil {
triggerLog.Error(err, "Unable to delete all policies. Will retry.")
}
triggerLog.Info("The uninstall preparation is not complete. Sleeping two seconds before checking again.")
time.Sleep(2 * time.Second)
}
}