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The core jetty server artifact.
//
// ========================================================================
// Copyright (c) 1995 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.server.handler;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.SocketException;
import java.net.URL;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.NetworkConnector;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Server;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A handler that shuts the server down on a valid request. Used to do "soft" restarts from Java.
* If _exitJvm is set to true a hard System.exit() call is being made.
* If _sendShutdownAtStart is set to true, starting the server will try to shut down an existing server at the same port.
* If _sendShutdownAtStart is set to true, make an http call to
* "http://localhost:" + port + "/shutdown?token=" + shutdownCookie
* in order to shut down the server.
*
* This handler is a contribution from Johannes Brodwall: https://bugs.eclipse.org/bugs/show_bug.cgi?id=357687
*
* Usage:
*
*
* Server server = new Server(8080);
* HandlerList handlers = new HandlerList();
* handlers.setHandlers(new Handler[]
* { someOtherHandler, new ShutdownHandler("secret password", false, true) });
* server.setHandler(handlers);
* server.start();
*
*
*
* public static void attemptShutdown(int port, String shutdownCookie) {
* try {
* URL url = new URL("http://localhost:" + port + "/shutdown?token=" + shutdownCookie);
* HttpURLConnection connection = (HttpURLConnection)url.openConnection();
* connection.setRequestMethod("POST");
* connection.getResponseCode();
* logger.info("Shutting down " + url + ": " + connection.getResponseMessage());
* } catch (SocketException e) {
* logger.debug("Not running");
* // Okay - the server is not running
* } catch (IOException e) {
* throw new RuntimeException(e);
* }
* }
*
*/
public class ShutdownHandler extends HandlerWrapper
{
private static final Logger LOG = LoggerFactory.getLogger(ShutdownHandler.class);
private final String _shutdownToken;
private boolean _sendShutdownAtStart;
private boolean _exitJvm = false;
/**
* Creates a listener that lets the server be shut down remotely (but only from localhost).
*
* @param shutdownToken a secret password to avoid unauthorized shutdown attempts
*/
public ShutdownHandler(String shutdownToken)
{
this(shutdownToken, false, false);
}
/**
* @param shutdownToken a secret password to avoid unauthorized shutdown attempts
* @param exitJVM If true, when the shutdown is executed, the handler class System.exit()
* @param sendShutdownAtStart If true, a shutdown is sent as an HTTP post
* during startup, which will shutdown any previously running instances of
* this server with an identically configured ShutdownHandler
*/
public ShutdownHandler(String shutdownToken, boolean exitJVM, boolean sendShutdownAtStart)
{
this._shutdownToken = shutdownToken;
setExitJvm(exitJVM);
setSendShutdownAtStart(sendShutdownAtStart);
}
public void sendShutdown() throws IOException
{
URL url = new URL(getServerUrl() + "/shutdown?token=" + _shutdownToken);
try
{
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("POST");
connection.getResponseCode();
LOG.info("Shutting down {}: {} {}", url, connection.getResponseCode(), connection.getResponseMessage());
}
catch (SocketException e)
{
LOG.debug("Not running");
// Okay - the server is not running
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
@SuppressWarnings("resource")
private String getServerUrl()
{
NetworkConnector connector = null;
for (Connector c : getServer().getConnectors())
{
if (c instanceof NetworkConnector)
{
connector = (NetworkConnector)c;
break;
}
}
if (connector == null)
return "http://localhost";
return "http://localhost:" + connector.getPort();
}
@Override
protected void doStart() throws Exception
{
super.doStart();
if (_sendShutdownAtStart)
sendShutdown();
}
@Override
public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
if (!target.equals("/shutdown"))
{
super.handle(target, baseRequest, request, response);
return;
}
if (!request.getMethod().equals("POST"))
{
response.sendError(HttpServletResponse.SC_BAD_REQUEST);
return;
}
if (!hasCorrectSecurityToken(request))
{
LOG.warn("Unauthorized tokenless shutdown attempt from {}", request.getRemoteAddr());
response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
return;
}
if (!requestFromLocalhost(baseRequest))
{
LOG.warn("Unauthorized non-loopback shutdown attempt from {}", request.getRemoteAddr());
response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
return;
}
LOG.info("Shutting down by request from {}", request.getRemoteAddr());
doShutdown(baseRequest, response);
}
protected void doShutdown(Request baseRequest, HttpServletResponse response) throws IOException
{
for (Connector connector : getServer().getConnectors())
{
connector.shutdown();
}
baseRequest.setHandled(true);
response.setStatus(200);
response.flushBuffer();
final Server server = getServer();
new Thread()
{
@Override
public void run()
{
try
{
shutdownServer(server);
}
catch (InterruptedException e)
{
LOG.trace("IGNORED", e);
}
catch (Exception e)
{
throw new RuntimeException("Shutting down server", e);
}
}
}.start();
}
private boolean requestFromLocalhost(Request request)
{
InetSocketAddress addr = request.getRemoteInetSocketAddress();
if (addr == null)
{
return false;
}
return addr.getAddress().isLoopbackAddress();
}
private boolean hasCorrectSecurityToken(HttpServletRequest request)
{
String tok = request.getParameter("token");
if (LOG.isDebugEnabled())
LOG.debug("Token: {}", tok);
return _shutdownToken.equals(tok);
}
private void shutdownServer(Server server) throws Exception
{
server.stop();
if (_exitJvm)
{
System.exit(0);
}
}
public void setExitJvm(boolean exitJvm)
{
this._exitJvm = exitJvm;
}
public boolean isSendShutdownAtStart()
{
return _sendShutdownAtStart;
}
public void setSendShutdownAtStart(boolean sendShutdownAtStart)
{
_sendShutdownAtStart = sendShutdownAtStart;
}
public String getShutdownToken()
{
return _shutdownToken;
}
public boolean isExitJvm()
{
return _exitJvm;
}
}