WIP

charts/moco/templates/generated/generated.yaml

@@ -155,6 +155,12 @@ rules:
       - patch
       - update
       - watch
+  - apiGroups:
+      - ""
+    resources:
+      - pods/status
+    verbs:
+      - get
   - apiGroups:
       - ""
     resources:

config/rbac/role.yaml

@@ -50,6 +50,12 @@ rules:
   - patch
   - update
   - watch
+- apiGroups:
+  - ""
+  resources:
+  - pods/status
+  verbs:
+  - get
 - apiGroups:
   - ""
   resources:

controllers/partition_controller.go

@@ -0,0 +1,208 @@
+package controllers
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	mocov1beta2 "github.com/cybozu-go/moco/api/v1beta2"
+	"github.com/cybozu-go/moco/pkg/constants"
+	appsv1 "k8s.io/api/apps/v1"
+	corev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	appsv1ac "k8s.io/client-go/applyconfigurations/apps/v1"
+	"k8s.io/client-go/tools/record"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	crlog "sigs.k8s.io/controller-runtime/pkg/log"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+)
+
+var _ reconcile.Reconciler = &StatefulSetPartitionReconciler{}
+
+// StatefulSetPartitionReconciler reconciles a StatefulSet object
+type StatefulSetPartitionReconciler struct {
+	client.Client
+	Recorder record.EventRecorder
+}
+
+//+kubebuilder:rbac:groups=moco.cybozu.com,resources=mysqlclusters,verbs=get;list;watch
+//+kubebuilder:rbac:groups=apps,resources=statefulsets,verbs=get;list;watch;update;patch
+//+kubebuilder:rbac:groups=apps,resources=statefulsets/status,verbs=get
+//+kubebuilder:rbac:groups="",resources=pods,verbs=get;list;watch
+//+kubebuilder:rbac:groups="",resources=pods/status,verbs=get
+//+kubebuilder:rbac:groups="",resources=events,verbs=create;update;patch
+
+// Reconcile implements Reconciler interface.
+// See https://pkg.go.dev/sigs.k8s.io/[email protected]/pkg/reconcile#Reconciler
+func (r *StatefulSetPartitionReconciler) Reconcile(ctx context.Context, req reconcile.Request) (reconcile.Result, error) {
+	log := crlog.FromContext(ctx)
+
+	sts := &appsv1.StatefulSet{}
+	err := r.Get(ctx, req.NamespacedName, sts)
+	if err != nil {
+		if apierrors.IsNotFound(err) {
+			return reconcile.Result{}, nil
+		}
+		log.Error(err, "unable to fetch StatefulSet", "name", req.NamespacedName.Name, "namespace", req.NamespacedName.Namespace)
+		return reconcile.Result{}, err
+	}
+
+	if !r.needPartitionUpdate(sts) {
+		return reconcile.Result{}, nil
+	}
+
+	if r.isStatefulSetRolloutComplete(sts) {
+		return reconcile.Result{}, nil
+	}
+
+	ready, err := r.isRolloutReady(ctx, sts)
+	if err != nil {
+		log.Error(err, "failed to check if rollout is ready", "name", req.NamespacedName.Name, "namespace", req.NamespacedName.Namespace)
+		return reconcile.Result{}, err
+	}
+	if !ready {
+		log.Info("rollout is not ready", "name", req.NamespacedName.Name, "namespace", req.NamespacedName.Namespace)
+	}
+
+	return reconcile.Result{}, nil
+}
+
+func (r *StatefulSetPartitionReconciler) SetupWithManager(mgr ctrl.Manager) error {
+	return ctrl.NewControllerManagedBy(mgr).
+		For(&appsv1.StatefulSet{}).
+		Owns(&corev1.Pod{}).
+		Complete(r)
+}
+
+// isRolloutReady returns true if the StatefulSet is ready for rolling update.
+func (r *StatefulSetPartitionReconciler) isRolloutReady(ctx context.Context, sts *appsv1.StatefulSet) (bool, error) {
+	isPodsReady, err := r.areAllChildPodsReady(ctx, sts)
+	if err != nil {
+		return false, fmt.Errorf("failed to check if all child pods are ready: %w", err)
+	}
+
+	if !isPodsReady {
+		return false, nil
+	}
+
+	cluster, err := r.getMySQLCluster(ctx, sts)
+	if err != nil {
+		return false, fmt.Errorf("failed to get MySQLCluster: %w", err)
+	}
+
+	if !r.isMySQLClusterHealthy(cluster) {
+		return false, nil
+	}
+
+	return false, nil
+}
+
+// areAllChildPodsReady checks if all child Pods of a given StatefulSet are in Ready state.
+// It lists all Pods that match the StatefulSet's selector in the same namespace,
+// and checks their Ready condition status.
+// The function returns true if all Pods are Ready, and false otherwise.
+func (r *StatefulSetPartitionReconciler) areAllChildPodsReady(ctx context.Context, sts *appsv1.StatefulSet) (bool, error) {
+	podList := &corev1.PodList{}
+	listOpts := []client.ListOption{
+		client.InNamespace(sts.Namespace),
+		client.MatchingLabels(sts.Spec.Selector.MatchLabels),
+	}
+
+	if err := r.List(ctx, podList, listOpts...); err != nil {
+		return false, err
+	}
+
+	if sts.Status.Replicas != int32(len(podList.Items)) {
+		return false, fmt.Errorf("number of child pods %d is not equal to replicas %d", len(podList.Items), sts.Status.Replicas)
+	}
+
+	for _, pod := range podList.Items {
+		for _, condition := range pod.Status.Conditions {
+			if condition.Type == corev1.PodReady && condition.Status != corev1.ConditionTrue {
+				return false, nil
+			}
+		}
+	}
+
+	return true, nil
+}
+
+// isMySQLClusterHealthy checks the health status of a given MySQLCluster.
+// It verifies that the 'Available' and 'Healthy' conditions in the cluster's status are 'True',
+// and that the value of '.status.syncedReplicas' matches that of '.spec.replicas'.
+// The function returns true if all conditions are met, and false otherwise.
+func (r *StatefulSetPartitionReconciler) isMySQLClusterHealthy(cluster *mocov1beta2.MySQLCluster) bool {
+	for _, condition := range cluster.Status.Conditions {
+		if (condition.Type == mocov1beta2.ConditionAvailable || condition.Type == mocov1beta2.ConditionHealthy) && condition.Status != metav1.ConditionTrue {
+			return false
+		}
+	}
+
+	return int32(cluster.Status.SyncedReplicas) == cluster.Spec.Replicas
+}
+
+// getMySQLCluster retrieves the MySQLCluster release that owns a given StatefulSet.
+func (r *StatefulSetPartitionReconciler) getMySQLCluster(ctx context.Context, sts *appsv1.StatefulSet) (*mocov1beta2.MySQLCluster, error) {
+	for _, ownerRef := range sts.GetOwnerReferences() {
+		if ownerRef.Kind != "MySQLCluster" {
+			continue
+		}
+
+		cluster := &mocov1beta2.MySQLCluster{}
+		if err := r.Get(ctx, types.NamespacedName{Name: ownerRef.Name, Namespace: sts.Namespace}, cluster); err != nil {
+			return nil, err
+		}
+
+		return cluster, nil
+	}
+
+	return nil, fmt.Errorf("StatefulSet %s/%s has no owner reference to MySQLCluster", sts.Namespace, sts.Name)
+}
+
+// isStatefulSetRolloutComplete returns true if the StatefulSet is update completed.
+func (r *StatefulSetPartitionReconciler) isStatefulSetRolloutComplete(sts *appsv1.StatefulSet) bool {
+	return sts.Status.CurrentRevision == sts.Status.UpdateRevision
+}
+
+// needPartitionUpdate returns true if the StatefulSet needs to update partition.
+func (r *StatefulSetPartitionReconciler) needPartitionUpdate(sts *appsv1.StatefulSet) bool {
+	if sts.Annotations[constants.AnnDisablePartitioning] == "true" {
+		return false
+	}
+	if sts.Spec.UpdateStrategy.RollingUpdate == nil || sts.Spec.UpdateStrategy.RollingUpdate.Partition == nil {
+		return false
+	}
+
+	return *sts.Spec.UpdateStrategy.RollingUpdate.Partition > 0
+}
+
+// applyNewPartition applies a new partition to the StatefulSet,
+// subtracting 1 from the current partition.
+func (r *StatefulSetPartitionReconciler) applyNewPartition(ctx context.Context, sts *appsv1.StatefulSet) error {
+	newPartition := *sts.Spec.UpdateStrategy.RollingUpdate.Partition - 1
+
+	key := client.ObjectKey{
+		Namespace: sts.Namespace,
+		Name:      sts.Name,
+	}
+
+	stsApplyCfg := appsv1ac.StatefulSet(sts.Name, sts.Namespace).
+		WithSpec(appsv1ac.StatefulSetSpec().
+			WithUpdateStrategy(appsv1ac.StatefulSetUpdateStrategy().
+				WithType(appsv1.RollingUpdateStatefulSetStrategyType).
+				WithRollingUpdate(appsv1ac.RollingUpdateStatefulSetStrategy().WithPartition(newPartition)),
+			),
+		)
+
+	if _, err := apply(ctx, r.Client, key, stsApplyCfg, appsv1ac.ExtractStatefulSet); err != nil {
+		if errors.Is(err, ErrApplyConfigurationNotChanged) {
+			return nil
+		}
+		return fmt.Errorf("failed to apply new partition to StatefulSet %s/%s: %w", sts.Namespace, sts.Name, err)
+	}
+
+	return nil
+}

pkg/constants/meta.go

@@ -21,6 +21,7 @@ const (
 	AnnSecretVersion         = "moco.cybozu.com/secret-version"
 	AnnClusteringStopped     = "moco.cybozu.com/clustering-stopped"
 	AnnReconciliationStopped = "moco.cybozu.com/reconciliation-stopped"
+	AnnDisablePartitioning   = "moco.cybozu.com/disable-partitioning"
 )
 
 // MySQLClusterFinalizer is the finalizer specifier for MySQLCluster.