-
Notifications
You must be signed in to change notification settings - Fork 458
/
executor.go
116 lines (104 loc) · 3.81 KB
/
executor.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
// 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 executor
import (
"bytes"
"context"
"io"
"net/url"
"strings"
"github.com/gardener/gardener/pkg/client/kubernetes"
corev1 "k8s.io/api/core/v1"
"k8s.io/client-go/kubernetes/scheme"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/remotecommand"
)
// Executor allows for execution of commands in containers.
type Executor interface {
ExecCommandInContainerWithFullOutput(ctx context.Context, namespace, podName, containerName string, cmd ...string) (stdout, stderr string, err error)
}
// execOptions passed to ExecWithOptions
type execOptions struct {
client kubernetes.Interface
command []string
namespace string
podName string
containerName string
stdin io.Reader
captureStdout bool
captureStderr bool
// If false, whitespace in std{err,out} will be removed.
preserveWhitespace bool
}
type defaultExecutor struct {
client kubernetes.Interface
}
// NewExecutor creates a new instance of Executor for a specific
// Kubernetes client.
func NewExecutor(client kubernetes.Interface) Executor {
return &defaultExecutor{client: client}
}
// ExecCommandInContainerWithFullOutput executes a command in the
// specified container and return stdout, stderr and error
func (e *defaultExecutor) ExecCommandInContainerWithFullOutput(ctx context.Context, namespace, podName, containerName string, cmd ...string) (stdout, stderr string, err error) {
return execWithOptions(execOptions{
client: e.client,
command: cmd,
namespace: namespace,
podName: podName,
containerName: containerName,
stdin: nil,
captureStdout: true,
captureStderr: true,
preserveWhitespace: false,
})
}
// execWithOptions executes a command in the specified container,
// returning stdout, stderr and error. `options` allowed for
// additional parameters to be passed.
func execWithOptions(options execOptions) (stdout, stderr string, err error) {
const tty = false
req := options.client.Kubernetes().CoreV1().RESTClient().Post().
Resource("pods").
Name(options.podName).
Namespace(options.namespace).
SubResource("exec").
Param("container", options.containerName)
req.VersionedParams(&corev1.PodExecOptions{
Container: options.containerName,
Command: options.command,
Stdin: options.stdin != nil,
Stdout: options.captureStdout,
Stderr: options.captureStderr,
TTY: tty,
}, scheme.ParameterCodec)
var stdoutBuff, stderrBuff bytes.Buffer
err = execute("POST", req.URL(), options.client.RESTConfig(), options.stdin, &stdoutBuff, &stderrBuff, tty)
if options.preserveWhitespace {
return stdoutBuff.String(), stderrBuff.String(), err
}
return strings.TrimSpace(stdoutBuff.String()), strings.TrimSpace(stderrBuff.String()), err
}
func execute(method string, url *url.URL, config *restclient.Config, stdin io.Reader, stdout, stderr io.Writer, tty bool) error {
exec, err := remotecommand.NewSPDYExecutor(config, method, url)
if err != nil {
return err
}
return exec.Stream(remotecommand.StreamOptions{
Stdin: stdin,
Stdout: stdout,
Stderr: stderr,
Tty: tty,
})
}