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AttachExample.java
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AttachExample.java
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/**
* Copyright (C) 2015 Red Hat, Inc.
*
* 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 io.fabric8.kubernetes.examples;
import io.fabric8.kubernetes.client.KubernetesClient;
import io.fabric8.kubernetes.client.KubernetesClientBuilder;
import io.fabric8.kubernetes.client.dsl.ExecListener;
import io.fabric8.kubernetes.client.dsl.ExecWatch;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.CompletableFuture;
/**
* This is an example of attaching to pod to access stdin, stdout, stderr
*/
public class AttachExample {
public static void main(String[] args) throws IOException {
if (args.length < 1) {
System.out.println("Usage: podName [namespace]");
return;
}
String podName = args[0];
String namespace = "default";
if (args.length > 1) {
namespace = args[1];
}
CompletableFuture<Void> sessionFuture = new CompletableFuture<>();
try (
KubernetesClient client = new KubernetesClientBuilder().build();
ExecWatch watch = attach(client, namespace, podName, sessionFuture)) {
System.out.println("Type 'exit' to detach");
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
while (true) {
String input = reader.readLine();
if (input.equals("exit")) {
return;
}
watch.getInput().write((input + "\n").getBytes(StandardCharsets.UTF_8));
watch.getInput().flush();
if (sessionFuture.isDone()) {
System.out.println("Session closed");
return;
}
}
}
}
private static ExecWatch attach(KubernetesClient client, String namespace, String podName,
CompletableFuture<Void> sessionFuture) {
return client.pods().inNamespace(namespace).withName(podName)
.redirectingInput()
.writingOutput(System.out)
.writingError(System.err)
.withTTY()
.usingListener(new ExecListener() {
@Override
public void onFailure(Throwable t, Response failureResponse) {
sessionFuture.complete(null);
}
@Override
public void onClose(int code, String reason) {
sessionFuture.complete(null);
}
})
.attach();
}
}