/
pod_executor.go
78 lines (67 loc) · 2.2 KB
/
pod_executor.go
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// Copyright 2020 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 framework
import (
"bytes"
"context"
"fmt"
"io"
"net/http"
"strings"
"k8s.io/client-go/tools/remotecommand"
"github.com/gardener/gardener/pkg/client/kubernetes"
)
// NewPodExecutor returns a podExecutor
func NewPodExecutor(client kubernetes.Interface) PodExecutor {
return &podExecutor{
client: client,
}
}
// PodExecutor is the pod executor interface
type PodExecutor interface {
Execute(ctx context.Context, namespace, name, containerName, command string) (io.Reader, error)
}
type podExecutor struct {
client kubernetes.Interface
}
// Execute executes a command on a pod
func (p *podExecutor) Execute(ctx context.Context, namespace, name, containerName, command string) (io.Reader, error) {
var stdout, stderr bytes.Buffer
request := p.client.Kubernetes().CoreV1().RESTClient().
Post().
Resource("pods").
Name(name).
Namespace(namespace).
SubResource("exec").
Param("container", containerName).
Param("command", "/bin/sh").
Param("stdin", "true").
Param("stdout", "true").
Param("stderr", "true").
Param("tty", "false")
executor, err := remotecommand.NewSPDYExecutor(p.client.RESTConfig(), http.MethodPost, request.URL())
if err != nil {
return nil, fmt.Errorf("failed to initialized the command exector: %v", err)
}
err = executor.StreamWithContext(ctx, remotecommand.StreamOptions{
Stdin: strings.NewReader(command),
Stdout: &stdout,
Stderr: &stderr,
Tty: false,
})
if err != nil {
return &stderr, err
}
return &stdout, nil
}