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commons.go
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/
commons.go
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/*
Copyright 2019 The Kubernetes Authors.
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 utils
import (
"bytes"
"fmt"
"log"
"strings"
"sigs.k8s.io/controller-runtime/pkg/client/config"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
kubernetes "k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/remotecommand"
)
// Perform backup or restore operation by running corresponding command "cmd" inside container named "containerName".
func PerformOperation(containerName, sqlDBName, cmd string) error {
// kubeconfig := filepath.Join(os.Getenv("HOME"), ".kube", "config")
// config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
// if err != nil {
// return err
// }
// Get a config to talk to the apiserver
cfg, err := config.GetConfig()
if err != nil {
log.Fatal(err)
}
clientset, err := kubernetes.NewForConfig(cfg)
if err != nil {
return err
}
req := clientset.Core().RESTClient().Post().
Resource("pods").
Name(fmt.Sprintf("%s-statefulset-0", sqlDBName)).
Namespace("default").
SubResource("exec")
scheme := runtime.NewScheme()
if err := corev1.AddToScheme(scheme); err != nil {
return err
}
parameterCodec := runtime.NewParameterCodec(scheme)
req.VersionedParams(&corev1.PodExecOptions{
Command: []string{"/bin/bash", "-c", cmd},
Container: containerName,
Stdin: false,
Stdout: true,
Stderr: true,
TTY: false,
}, parameterCodec)
exec, err := remotecommand.NewSPDYExecutor(cfg, "POST", req.URL())
if err != nil {
return err
}
var stdout, stderr bytes.Buffer
err = exec.Stream(remotecommand.StreamOptions{
Stdin: nil,
Stdout: &stdout,
Stderr: &stderr,
Tty: false,
})
if err != nil {
// Needed as SPDY executor streams until a client closes the connection or the server disconnects.
if strings.Index(stderr.String(), "already exists") == -1 {
return fmt.Errorf("%+v: %s", err, stderr.String())
}
}
return nil
}