protect sts old pod (#38)

Author: Eikykun

Diff for: pkg/manager/controllers/rollout/rollout_controller.go

@@ -178,7 +178,7 @@ func (r *RolloutReconciler) Reconcile(ctx context.Context, req reconcile.Request
 		}
 		if rollType != "all" && rollType != "" && !strings.Contains(cfg.Name, rollType) {
 			for _, po := range shardingPods[cfg.Name] {
-				expectedPodRevision[po.Name] = po.Labels["controller-revision-hash"]
+				expectedPodRevision[po.Name] = po.Labels[appsv1.ControllerRevisionHashLabelKey]
 			}
 			continue
 		}

Diff for: pkg/webhook/pod/pod_mutating_handler.go

@@ -19,18 +19,26 @@ package pod
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"net/http"
 
 	admissionv1 "k8s.io/api/admission/v1"
+	appsv1 "k8s.io/api/apps/v1"
 	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/util/strategicpatch"
 	kubeclientset "k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/kubernetes/scheme"
 	"k8s.io/klog/v2"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
 	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
 
 	"github.com/KusionStack/controller-mesh/pkg/apis/ctrlmesh"
+	"github.com/KusionStack/controller-mesh/pkg/manager/controllers/rollout"
 )
 
 type MutatingHandler struct {
@@ -90,3 +98,87 @@ func (h *MutatingHandler) InjectDecoder(d *admission.Decoder) error {
 	h.Decoder = d
 	return nil
 }
+
+func (h *MutatingHandler) revisionRollOut(ctx context.Context, pod *v1.Pod) (err error) {
+	podRevision := pod.Labels[appsv1.ControllerRevisionHashLabelKey]
+	sts := &appsv1.StatefulSet{}
+	if pod.OwnerReferences == nil || len(pod.OwnerReferences) == 0 {
+		return fmt.Errorf("illegal owner reference")
+	}
+	if pod.OwnerReferences[0].Kind != "StatefulSet" {
+		return fmt.Errorf("illegal owner reference kind %s", pod.OwnerReferences[0].Kind)
+	}
+
+	sts, err = h.directKubeClient.AppsV1().StatefulSets(pod.Namespace).Get(ctx, pod.OwnerReferences[0].Name, metav1.GetOptions{})
+	if err != nil {
+		klog.Error(err)
+		return err
+	}
+	if sts.Spec.UpdateStrategy.Type != appsv1.OnDeleteStatefulSetStrategyType {
+		return nil
+	}
+	expectState := rollout.GetExpectedRevision(sts)
+	if expectState.UpdateRevision == "" || expectState.PodRevision == nil || expectState.PodRevision[pod.Name] == "" {
+		return
+	}
+	expectedRevision := expectState.PodRevision[pod.Name]
+	if expectedRevision == podRevision {
+		return
+	}
+	// Do not use manager client get ControllerRevision. (To avoid Informer cache)
+	expectRevision, err := h.directKubeClient.AppsV1().ControllerRevisions(pod.Namespace).Get(ctx, expectedRevision, metav1.GetOptions{})
+	if err != nil {
+		return fmt.Errorf("cannot find old ControllerRevision %s", expectedRevision)
+	}
+
+	createRevision, err := h.directKubeClient.AppsV1().ControllerRevisions(pod.Namespace).Get(ctx, podRevision, metav1.GetOptions{})
+	if err != nil {
+		return fmt.Errorf("cannot find ControllerRevision %s by pod %s/%s", podRevision, pod.Namespace, pod.Name)
+	}
+
+	expectedSts := &appsv1.StatefulSet{}
+	createdSts := &appsv1.StatefulSet{}
+
+	applyPatch(expectedSts, &expectRevision.Data.Raw)
+	applyPatch(createdSts, &createRevision.Data.Raw)
+
+	expectedPo := &v1.Pod{
+		Spec: expectedSts.Spec.Template.Spec,
+	}
+	createdPo := &v1.Pod{
+		Spec: createdSts.Spec.Template.Spec,
+	}
+
+	expectedBt, _ := runtime.Encode(patchCodec, expectedPo)
+	createdBt, _ := runtime.Encode(patchCodec, createdPo)
+	currentBt, _ := runtime.Encode(patchCodec, pod)
+
+	patch, err := strategicpatch.CreateTwoWayMergePatch(createdBt, expectedBt, expectedPo)
+	if err != nil {
+		return err
+	}
+	originBt, err := strategicpatch.StrategicMergePatch(currentBt, patch, pod)
+	if err != nil {
+		return err
+	}
+	newPod := &v1.Pod{}
+	if err = json.Unmarshal(originBt, newPod); err != nil {
+		return err
+	}
+	pod.Spec = newPod.Spec
+	pod.Labels[appsv1.ControllerRevisionHashLabelKey] = expectedRevision
+	return
+}
+
+var patchCodec = scheme.Codecs.LegacyCodec(schema.GroupVersion{Group: "apps", Version: "v1"}, schema.GroupVersion{Version: "v1"})
+
+func applyPatch(target runtime.Object, podPatch *[]byte) error {
+	patched, err := strategicpatch.StrategicMergePatch([]byte(runtime.EncodeOrDie(patchCodec, target)), *podPatch, target)
+	if err != nil {
+		return err
+	}
+	if err = json.Unmarshal(patched, target); err != nil {
+		return err
+	}
+	return nil
+}