/
statefulsets.go
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/
statefulsets.go
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// Copyright (c) 2019 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 general
import (
"context"
"fmt"
"github.com/gardener/gardener/extensions/pkg/controller/healthcheck"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
"github.com/gardener/gardener/pkg/utils/kubernetes/health"
"github.com/go-logr/logr"
appsv1 "k8s.io/api/apps/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/log"
)
// StatefulSetHealthChecker contains all the information for the StatefulSet HealthCheck
type StatefulSetHealthChecker struct {
logger logr.Logger
seedClient client.Client
shootClient client.Client
name string
checkType StatefulSetCheckType
}
// StatefulSetCheckType in which cluster the check will be executed
type StatefulSetCheckType string
const (
statefulSetCheckTypeSeed StatefulSetCheckType = "Seed"
statefulSetCheckTypeShoot StatefulSetCheckType = "Shoot"
)
// NewSeedStatefulSetChecker is a healthCheck function to check StatefulSets
func NewSeedStatefulSetChecker(name string) healthcheck.HealthCheck {
return &StatefulSetHealthChecker{
name: name,
checkType: statefulSetCheckTypeSeed,
}
}
// NewShootStatefulSetChecker is a healthCheck function to check StatefulSets
func NewShootStatefulSetChecker(name string) healthcheck.HealthCheck {
return &StatefulSetHealthChecker{
name: name,
checkType: statefulSetCheckTypeShoot,
}
}
// InjectSeedClient injects the seed client
func (healthChecker *StatefulSetHealthChecker) InjectSeedClient(seedClient client.Client) {
healthChecker.seedClient = seedClient
}
// InjectShootClient injects the shoot client
func (healthChecker *StatefulSetHealthChecker) InjectShootClient(shootClient client.Client) {
healthChecker.shootClient = shootClient
}
// SetLoggerSuffix injects the logger
func (healthChecker *StatefulSetHealthChecker) SetLoggerSuffix(provider, extension string) {
healthChecker.logger = log.Log.WithName(fmt.Sprintf("%s-%s-healthcheck-deployment", provider, extension))
}
// DeepCopy clones the healthCheck struct by making a copy and returning the pointer to that new copy
func (healthChecker *StatefulSetHealthChecker) DeepCopy() healthcheck.HealthCheck {
copy := *healthChecker
return ©
}
// Check executes the health check
func (healthChecker *StatefulSetHealthChecker) Check(ctx context.Context, request types.NamespacedName) (*healthcheck.SingleCheckResult, error) {
statefulSet := &appsv1.StatefulSet{}
var err error
if healthChecker.checkType == statefulSetCheckTypeSeed {
err = healthChecker.seedClient.Get(ctx, client.ObjectKey{Namespace: request.Namespace, Name: healthChecker.name}, statefulSet)
} else {
err = healthChecker.shootClient.Get(ctx, client.ObjectKey{Namespace: request.Namespace, Name: healthChecker.name}, statefulSet)
}
if err != nil {
if apierrors.IsNotFound(err) {
return &healthcheck.SingleCheckResult{
Status: gardencorev1beta1.ConditionFalse,
Detail: fmt.Sprintf("StatefulSet %q in namespace %q not found", healthChecker.name, request.Namespace),
}, nil
}
err := fmt.Errorf("failed to retrieve StatefulSet %q in namespace %q: %w", healthChecker.name, request.Namespace, err)
healthChecker.logger.Error(err, "Health check failed")
return nil, err
}
if isHealthy, err := statefulSetIsHealthy(statefulSet); !isHealthy {
healthChecker.logger.Error(err, "Health check failed")
return &healthcheck.SingleCheckResult{
Status: gardencorev1beta1.ConditionFalse,
Detail: err.Error(),
}, nil
}
return &healthcheck.SingleCheckResult{
Status: gardencorev1beta1.ConditionTrue,
}, nil
}
func statefulSetIsHealthy(statefulSet *appsv1.StatefulSet) (bool, error) {
if err := health.CheckStatefulSet(statefulSet); err != nil {
err := fmt.Errorf("statefulSet %q in namespace %q is unhealthy: %w", statefulSet.Name, statefulSet.Namespace, err)
return false, err
}
return true, nil
}