org.eclipse.jetty.maven.plugin.JettyStopMojo Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.maven.plugin;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.io.OutputStream;
import java.net.ConnectException;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
/**
* This goal stops a running instance of jetty.
*
* The stopPort and stopKey parameters can be used to
* configure which jetty to stop.
*/
@Mojo(name = "stop")
public class JettyStopMojo extends AbstractWebAppMojo
{
/**
* Max time in seconds that the plugin will wait for confirmation that jetty has stopped.
*/
@Parameter
protected int stopWait;
@Override
protected void startJettyEmbedded() throws MojoExecutionException
{
//Does not start jetty
return;
}
@Override
protected void startJettyForked() throws MojoExecutionException
{
//Does not start jetty
return;
}
@Override
protected void startJettyHome() throws MojoExecutionException
{
//Does not start jetty
return;
}
@Override
public void execute() throws MojoExecutionException, MojoFailureException
{
if (stopPort <= 0)
throw new MojoExecutionException("Please specify a valid port");
if (stopKey == null)
throw new MojoExecutionException("Please specify a valid stopKey");
String command = "forcestop";
if (stopWait > 0)
{
//try to get the pid of the forked jetty process
Long pid = null;
try
{
String response = send(stopKey + "\r\n" + "pid" + "\r\n", stopWait);
pid = Long.valueOf(response);
}
catch (NumberFormatException e)
{
getLog().info("Server returned bad pid");
}
catch (ConnectException e)
{
//jetty not running, no point continuing
getLog().info("Jetty not running!");
return;
}
catch (Exception e)
{
//jetty running, try to stop it regardless of error
getLog().error(e);
}
//now send the stop command and wait for confirmation - either an ack from jetty, or
//that the process has stopped
if (pid == null)
{
//no pid, so just wait until jetty reports itself stopped
try
{
getLog().info("Waiting " + stopWait + " seconds for jetty to stop");
String response = send(stopKey + "\r\n" + command + "\r\n", stopWait);
if ("Stopped".equals(response))
getLog().info("Server reports itself as stopped");
else
getLog().info("Couldn't verify server as stopped, received " + response);
}
catch (ConnectException e)
{
getLog().info("Jetty not running!");
}
catch (Exception e)
{
getLog().error(e);
}
}
else
{
//wait for pid to stop
getLog().info("Waiting " + stopWait + " seconds for jetty " + pid + " to stop");
Optional optional = ProcessHandle.of(pid);
final long remotePid = pid.longValue();
optional.ifPresentOrElse(p ->
{
try
{
//if running in the same process, just send the stop
//command and wait for the response
if (ProcessHandle.current().pid() == remotePid)
{
send(stopKey + "\r\n" + command + "\r\n", stopWait);
}
else
{
//running forked, so wait for the process
send(stopKey + "\r\n" + command + "\r\n", 0);
CompletableFuture future = p.onExit();
if (p.isAlive())
{
p = future.get(stopWait, TimeUnit.SECONDS);
}
if (p.isAlive())
getLog().info("Couldn't verify server process stop");
else
getLog().info("Server process stopped");
}
}
catch (ConnectException e)
{
//jetty not listening on the given port, don't wait for the process
getLog().info("Jetty not running!");
}
catch (TimeoutException e)
{
getLog().error("Timeout expired while waiting for server process to stop");
}
catch (Throwable e)
{
getLog().error(e);
}
}, () -> getLog().info("Process not running"));
}
}
else
{
//send the stop command but don't wait to verify the stop
getLog().info("Stopping jetty");
try
{
send(stopKey + "\r\n" + command + "\r\n", 0);
}
catch (ConnectException e)
{
getLog().info("Jetty not running!");
}
catch (Exception e)
{
getLog().error(e);
}
}
}
/**
* Send a command to a jetty process, optionally waiting for a response.
*
* @param command the command to send
* @param wait length of time in sec to wait for a response
* @return the response, if any, to the command
* @throws Exception
*/
private String send(String command, int wait)
throws Exception
{
String response = null;
try (Socket s = new Socket(InetAddress.getByName("127.0.0.1"), stopPort); OutputStream out = s.getOutputStream();)
{
out.write(command.getBytes());
out.flush();
if (wait > 0)
{
//Wait for a response
s.setSoTimeout(wait * 1000);
try (LineNumberReader lin = new LineNumberReader(new InputStreamReader(s.getInputStream()));)
{
response = lin.readLine();
}
}
else
{
//Wait only a small amount of time to ensure TCP has sent the message
s.setSoTimeout(1000);
s.getInputStream().read();
}
return response;
}
}
}
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