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The core jetty server artifact.
//
// ========================================================================
// Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
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 javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.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.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/* ------------------------------------------------------------ */
/**
* 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 a 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 = Log.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 server
* the Jetty instance that should be shut down
* @param shutdownToken
* a secret password to avoid unauthorized shutdown attempts
*/
@Deprecated
public ShutdownHandler(Server server, String shutdownToken)
{
this(shutdownToken);
}
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 a 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();
}
response.sendError(200, "Connectors closed, commencing full shutdown");
baseRequest.setHandled(true);
final Server server=getServer();
new Thread()
{
@Override
public void run ()
{
try
{
shutdownServer(server);
}
catch (InterruptedException e)
{
LOG.ignore(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;
}
}