/
kubernetes.go
162 lines (135 loc) · 4.45 KB
/
kubernetes.go
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// Copyright © 2021 Cisco
//
// SPDX-License-Identifier: Apache-2.0
//
// 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.
//
// All rights reserved.
package cluster
import (
"context"
"fmt"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
ctrl "sigs.k8s.io/controller-runtime"
)
const (
defaultK8sNamespace string = "cnwan-operator-system"
defaultGoogleServiceAccountSecretName string = "google-service-account"
defaultAwsCredentialsSecret string = "aws-credentials"
defaultEtcdCredentialsSecretName string = "etcd-credentials"
defaultOpSettingsConfigmapName string = "cnwan-operator-settings"
)
var (
kcli kubernetes.Interface
)
func getK8sClientSet() (kubernetes.Interface, error) {
if kcli != nil {
return kcli, nil
}
k8sconf, err := ctrl.GetConfig()
if err != nil {
return nil, err
}
kcli, err = kubernetes.NewForConfig(k8sconf)
if err != nil {
return nil, err
}
return kcli, nil
}
func getSecret(ctx context.Context, name string) (*corev1.Secret, error) {
cli, err := getK8sClientSet()
if err != nil {
return nil, err
}
// TODO: May change this on future to use a different namespace.
secret, err := cli.CoreV1().Secrets(defaultK8sNamespace).Get(ctx, name, metav1.GetOptions{})
if err != nil {
return nil, err
}
return secret, nil
}
// GetGoogleServiceAccountSecret tries to retrieve the Google Service Account
// secret from Kubernetes, so that it could be used to login to Google Cloud
// services such as Service Directory or to pull cloud metadata/configuration.
func GetGoogleServiceAccountSecret(ctx context.Context) ([]byte, error) {
secret, err := getSecret(ctx, defaultGoogleServiceAccountSecretName)
if err != nil {
return nil, err
}
switch l := len(secret.Data); {
case l == 0:
return nil, fmt.Errorf(`secret %s/%s has no data`, defaultK8sNamespace, defaultGoogleServiceAccountSecretName)
case l > 1:
return nil, fmt.Errorf(`secret %s/%s has multiple data`, defaultK8sNamespace, defaultGoogleServiceAccountSecretName)
}
var data []byte
for _, d := range secret.Data {
data = d
break
}
return data, nil
}
// GetAWSCredentialsSecret tries to retrieve the Google Service Account
// secret from Kubernetes, so that it could be used to login to AWS.
// TODO: as of now this function is basically the same as the one for
// google. For now we keep it like this, but the whole package will soon
// be redesigned anyways.
func GetAWSCredentialsSecret(ctx context.Context) ([]byte, error) {
secret, err := getSecret(ctx, defaultAwsCredentialsSecret)
if err != nil {
return nil, err
}
if len(secret.Data) == 0 {
return nil, fmt.Errorf(`secret %s/%s has no data`, defaultK8sNamespace, defaultAwsCredentialsSecret)
}
var data []byte
for _, d := range secret.Data {
data = d
break
}
return data, nil
}
// GetEtcdCredentials tries to retrieve the etcd credentials secret from
// Kubernetes, so that it could be used to start an etcd client.
func GetEtcdCredentialsSecret(ctx context.Context) (string, string, error) {
secret, err := getSecret(ctx, defaultEtcdCredentialsSecretName)
if err != nil {
return "", "", err
}
return string(secret.Data["username"]), string(secret.Data["password"]), nil
}
func GetOperatorSettingsConfigMap(ctx context.Context) ([]byte, error) {
cli, err := getK8sClientSet()
if err != nil {
return nil, err
}
// TODO: May change this on future to use a different namespace.
cfgm, err := cli.CoreV1().ConfigMaps(defaultK8sNamespace).Get(ctx, defaultOpSettingsConfigmapName, metav1.GetOptions{})
if err != nil {
return nil, err
}
switch l := len(cfgm.Data); {
case l == 0:
return nil, fmt.Errorf(`configmap %s/%s has no data`, defaultK8sNamespace, defaultOpSettingsConfigmapName)
case l > 1:
return nil, fmt.Errorf(`configmap %s/%s has multiple data`, defaultK8sNamespace, defaultOpSettingsConfigmapName)
}
var data []byte
for _, d := range cfgm.Data {
data = []byte(d)
break
}
return data, err
}