/
pod_galera_controller.go
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/
pod_galera_controller.go
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/*
Copyright 2022.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package controllers
import (
"context"
"errors"
"fmt"
mariadbv1alpha1 "github.com/mariadb-operator/mariadb-operator/api/v1alpha1"
"github.com/mariadb-operator/mariadb-operator/pkg/health"
mdbpod "github.com/mariadb-operator/mariadb-operator/pkg/pod"
"github.com/mariadb-operator/mariadb-operator/pkg/statefulset"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/tools/record"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/log"
)
// PodGaleraController reconciles a Pod object
type PodGaleraController struct {
client.Client
recorder record.EventRecorder
}
func NewPodGaleraController(client client.Client, recorder record.EventRecorder) PodReadinessController {
return &PodGaleraController{
Client: client,
recorder: recorder,
}
}
func (r *PodGaleraController) ReconcilePodReady(ctx context.Context, pod corev1.Pod, mariadb *mariadbv1alpha1.MariaDB) error {
if !r.shouldReconcile(mariadb) || !*mariadb.Galera().Primary.AutomaticFailover {
return nil
}
if mariadb.Status.CurrentPrimaryPodIndex == nil {
return errors.New("'status.currentPrimaryPodIndex' must be set")
}
logger := log.FromContext(ctx)
logger.V(1).Info("Reconciling Pod in Ready state", "pod", pod.Name)
currentPrimaryPodKey := types.NamespacedName{
Name: statefulset.PodName(mariadb.ObjectMeta, *mariadb.Status.CurrentPrimaryPodIndex),
Namespace: mariadb.Namespace,
}
var currentPrimaryPod corev1.Pod
if err := r.Get(ctx, currentPrimaryPodKey, ¤tPrimaryPod); err != nil {
return fmt.Errorf("error getting current primary Pod: %v", err)
}
if mdbpod.PodReady(¤tPrimaryPod) {
return nil
}
fromIndex := mariadb.Status.CurrentPrimaryPodIndex
toIndex, err := statefulset.PodIndex(pod.Name)
if err != nil {
return fmt.Errorf("error getting Pod index: %v", err)
}
if *fromIndex == *toIndex {
return nil
}
logger.Info("Switching primary", "from-index", *fromIndex, "to-index", *toIndex)
if err := r.patch(ctx, mariadb, func(mdb *mariadbv1alpha1.MariaDB) {
mdb.Galera().Primary.PodIndex = toIndex
}); err != nil {
return err
}
logger.Info("Switching primary", "from-index", *fromIndex, "to-index", *toIndex)
r.recorder.Eventf(mariadb, corev1.EventTypeNormal, mariadbv1alpha1.ReasonPrimarySwitching,
"Switching primary from index '%d' to index '%d'", *fromIndex, *toIndex)
return nil
}
func (r *PodGaleraController) ReconcilePodNotReady(ctx context.Context, pod corev1.Pod, mariadb *mariadbv1alpha1.MariaDB) error {
if !r.shouldReconcile(mariadb) || !*mariadb.Galera().Primary.AutomaticFailover {
return nil
}
if mariadb.Status.CurrentPrimaryPodIndex == nil {
return errors.New("'status.currentPrimaryPodIndex' must be set")
}
logger := log.FromContext(ctx)
logger.V(1).Info("Reconciling Pod in non Ready state", "pod", pod.Name)
index, err := statefulset.PodIndex(pod.Name)
if err != nil {
return fmt.Errorf("error getting Pod index: %v", err)
}
if *index != *mariadb.Status.CurrentPrimaryPodIndex {
return nil
}
fromIndex := mariadb.Status.CurrentPrimaryPodIndex
toIndex, err := health.HealthyReplica(ctx, r, mariadb)
if err != nil {
return fmt.Errorf("error getting healthy replica: %v", err)
}
if err := r.patch(ctx, mariadb, func(mdb *mariadbv1alpha1.MariaDB) {
mdb.Galera().Primary.PodIndex = toIndex
}); err != nil {
return err
}
logger.Info("Switching primary", "from-index", *fromIndex, "to-index", *toIndex)
r.recorder.Eventf(mariadb, corev1.EventTypeNormal, mariadbv1alpha1.ReasonPrimarySwitching,
"Switching primary from index '%d' to index '%d'", *fromIndex, *toIndex)
return nil
}
func (r *PodGaleraController) shouldReconcile(mariadb *mariadbv1alpha1.MariaDB) bool {
return mariadb.Galera().Enabled && mariadb.HasGaleraConfiguredCondition() && !mariadb.IsRestoringBackup()
}
func (r *PodGaleraController) patch(ctx context.Context, mariadb *mariadbv1alpha1.MariaDB,
patcher func(*mariadbv1alpha1.MariaDB)) error {
patch := client.MergeFrom(mariadb.DeepCopy())
patcher(mariadb)
if err := r.Patch(ctx, mariadb, patch); err != nil {
return fmt.Errorf("error patching MariaDB: %v", err)
}
return nil
}