/
PodAttachEquivalent.java
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/
PodAttachEquivalent.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.kubectl.equivalents;
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 lombok.Getter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.CompletableFuture;
/**
* This sample code is Java equivalent to `kubectl attach my-pod`. It assumes that
* a Pod with specified name exists in the cluster.
*/
public class PodAttachEquivalent {
private static final Logger logger = LoggerFactory.getLogger(PodAttachEquivalent.class);
public static void main(String[] args) throws IOException {
try (KubernetesClient client = new KubernetesClientBuilder().build()) {
MyAttachListener listener = new MyAttachListener();
ExecWatch watch = client.pods().inNamespace("default").withName("my-pod")
.redirectingInput()
.writingOutput(System.out)
.writingError(System.err)
.withTTY()
.usingListener(listener)
.attach();
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
while (!listener.getSessionCompletionFuture().isDone()) {
String input = reader.readLine();
watch.getInput().write((input + "\n").getBytes(StandardCharsets.UTF_8));
watch.getInput().flush();
}
watch.close();
}
}
private static class MyAttachListener implements ExecListener {
@Getter
private final CompletableFuture<Void> sessionCompletionFuture = new CompletableFuture<>();
@Override
public void onOpen() {
logger.info("Attached to the pod");
}
@Override
public void onFailure(Throwable t, Response failureResponse) {
logger.warn("Error encountered", t);
sessionCompletionFuture.complete(null);
}
@Override
public void onClose(int i, String s) {
logger.info("Session closed");
sessionCompletionFuture.complete(null);
}
}
}