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utils.go
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utils.go
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// Copyright (c) 2018 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 common
import (
"context"
"fmt"
"math/big"
"net"
"strings"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
hvpav1alpha1 "github.com/gardener/hvpa-controller/api/v1alpha1"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
extensionsv1beta1 "k8s.io/api/extensions/v1beta1"
networkingv1 "k8s.io/api/networking/v1"
rbacv1 "k8s.io/api/rbac/v1"
schedulingv1 "k8s.io/api/scheduling/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// FilterEntriesByPrefix returns a list of strings which begin with the given prefix.
func FilterEntriesByPrefix(prefix string, entries []string) []string {
var result []string
for _, entry := range entries {
if strings.HasPrefix(entry, prefix) {
result = append(result, entry)
}
}
return result
}
// ComputeOffsetIP parses the provided <subnet> and offsets with the value of <offset>.
// For example, <subnet> = 100.64.0.0/11 and <offset> = 10 the result would be 100.64.0.10
// IPv6 and IPv4 is supported.
func ComputeOffsetIP(subnet *net.IPNet, offset int64) (net.IP, error) {
if subnet == nil {
return nil, fmt.Errorf("subnet is nil")
}
isIPv6 := false
bytes := subnet.IP.To4()
if bytes == nil {
isIPv6 = true
bytes = subnet.IP.To16()
}
ip := net.IP(big.NewInt(0).Add(big.NewInt(0).SetBytes(bytes), big.NewInt(offset)).Bytes())
if !subnet.Contains(ip) {
return nil, fmt.Errorf("cannot compute IP with offset %d - subnet %q too small", offset, subnet)
}
// there is no broadcast address on IPv6
if isIPv6 {
return ip, nil
}
for i := range ip {
// IP address is not the same, so it's not the broadcast ip.
if ip[i] != ip[i]|^subnet.Mask[i] {
return ip.To4(), nil
}
}
return nil, fmt.Errorf("computed IPv4 address %q is broadcast for subnet %q", ip, subnet)
}
// GenerateAddonConfig returns the provided <values> in case <enabled> is true. Otherwise, nil is
// being returned.
func GenerateAddonConfig(values map[string]interface{}, enabled bool) map[string]interface{} {
v := map[string]interface{}{
"enabled": enabled,
}
if enabled {
for key, value := range values {
v[key] = value
}
}
return v
}
// DeleteLoki deletes all resources of the Loki in a given namespace.
func DeleteLoki(ctx context.Context, k8sClient client.Client, namespace string) error {
resources := []client.Object{
&networkingv1.NetworkPolicy{ObjectMeta: metav1.ObjectMeta{Name: "allow-loki", Namespace: namespace}},
&networkingv1.NetworkPolicy{ObjectMeta: metav1.ObjectMeta{Name: "allow-to-loki", Namespace: namespace}},
&hvpav1alpha1.Hvpa{ObjectMeta: metav1.ObjectMeta{Name: "loki", Namespace: namespace}},
&corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Name: "loki-config", Namespace: namespace}},
&corev1.Service{ObjectMeta: metav1.ObjectMeta{Name: "loki", Namespace: namespace}},
&appsv1.StatefulSet{ObjectMeta: metav1.ObjectMeta{Name: "loki", Namespace: namespace}},
&corev1.PersistentVolumeClaim{ObjectMeta: metav1.ObjectMeta{Name: "loki-loki-0", Namespace: namespace}},
}
return kutil.DeleteObjects(ctx, k8sClient, resources...)
}
// DeleteSeedLoggingStack deletes all seed resource of the logging stack in the garden namespace.
func DeleteSeedLoggingStack(ctx context.Context, k8sClient client.Client) error {
resources := []client.Object{
&corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Name: "fluent-bit-config", Namespace: v1beta1constants.GardenNamespace}},
&appsv1.DaemonSet{ObjectMeta: metav1.ObjectMeta{Name: "fluent-bit", Namespace: v1beta1constants.GardenNamespace}},
&networkingv1.NetworkPolicy{ObjectMeta: metav1.ObjectMeta{Name: "allow-fluentbit", Namespace: v1beta1constants.GardenNamespace}},
&schedulingv1.PriorityClass{ObjectMeta: metav1.ObjectMeta{Name: "fluent-bit"}},
&schedulingv1.PriorityClass{ObjectMeta: metav1.ObjectMeta{Name: "loki"}},
&schedulingv1.PriorityClass{ObjectMeta: metav1.ObjectMeta{Name: GardenLokiPriorityClassName}},
&rbacv1.ClusterRole{ObjectMeta: metav1.ObjectMeta{Name: "fluent-bit-read"}},
&rbacv1.ClusterRoleBinding{ObjectMeta: metav1.ObjectMeta{Name: "fluent-bit-read"}},
&corev1.ServiceAccount{ObjectMeta: metav1.ObjectMeta{Name: "fluent-bit", Namespace: v1beta1constants.GardenNamespace}},
&corev1.Service{ObjectMeta: metav1.ObjectMeta{Name: "fluent-bit", Namespace: v1beta1constants.GardenNamespace}},
}
if err := kutil.DeleteObjects(ctx, k8sClient, resources...); err != nil {
return err
}
return DeleteLoki(ctx, k8sClient, v1beta1constants.GardenNamespace)
}
// DeleteAlertmanager deletes all resources of the Alertmanager in a given namespace.
func DeleteAlertmanager(ctx context.Context, k8sClient client.Client, namespace string) error {
objs := []client.Object{
&appsv1.StatefulSet{
ObjectMeta: metav1.ObjectMeta{
Name: v1beta1constants.StatefulSetNameAlertManager,
Namespace: namespace,
},
},
&extensionsv1beta1.Ingress{
ObjectMeta: metav1.ObjectMeta{
Name: "alertmanager",
Namespace: namespace,
},
},
&networkingv1.Ingress{
ObjectMeta: metav1.ObjectMeta{
Name: "alertmanager",
Namespace: namespace,
},
},
&corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: "alertmanager-client",
Namespace: namespace,
},
},
&corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: "alertmanager",
Namespace: namespace,
},
},
&corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "alertmanager-basic-auth",
Namespace: namespace,
},
},
// TODO(rfranzke): Remove this secret in a future release.
&corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "alertmanager-tls",
Namespace: namespace,
},
},
&corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "alertmanager-config",
Namespace: namespace,
},
},
&corev1.PersistentVolumeClaim{
ObjectMeta: metav1.ObjectMeta{
Name: "alertmanager-db-alertmanager-0",
Namespace: namespace,
},
},
}
return kutil.DeleteObjects(ctx, k8sClient, objs...)
}
// DeleteGrafanaByRole deletes the monitoring stack for the shoot owner.
func DeleteGrafanaByRole(ctx context.Context, k8sClient kubernetes.Interface, namespace, role string) error {
if k8sClient == nil {
return fmt.Errorf("require kubernetes client")
}
deleteOptions := []client.DeleteAllOfOption{
client.InNamespace(namespace),
client.MatchingLabels{
"component": "grafana",
"role": role,
},
}
if err := k8sClient.Client().DeleteAllOf(ctx, &appsv1.Deployment{}, append(deleteOptions, client.PropagationPolicy(metav1.DeletePropagationForeground))...); client.IgnoreNotFound(err) != nil {
return err
}
if err := k8sClient.Client().DeleteAllOf(ctx, &corev1.ConfigMap{}, deleteOptions...); client.IgnoreNotFound(err) != nil {
return err
}
if err := k8sClient.Client().DeleteAllOf(ctx, &networkingv1.Ingress{}, deleteOptions...); client.IgnoreNotFound(err) != nil {
return err
}
if err := k8sClient.Client().DeleteAllOf(ctx, &corev1.Secret{}, deleteOptions...); client.IgnoreNotFound(err) != nil {
return err
}
if err := k8sClient.Client().Delete(
ctx,
&corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: "grafana-" + role,
Namespace: namespace,
}},
); client.IgnoreNotFound(err) != nil {
return err
}
return nil
}