/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.nephele.jobmanager.web;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.jetty.http.security.Constraint;
import org.eclipse.jetty.security.ConstraintMapping;
import org.eclipse.jetty.security.ConstraintSecurityHandler;
import org.eclipse.jetty.security.HashLoginService;
import org.eclipse.jetty.security.authentication.BasicAuthenticator;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.HandlerList;
import org.eclipse.jetty.server.handler.ResourceHandler;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import eu.stratosphere.configuration.ConfigConstants;
import eu.stratosphere.configuration.Configuration;
import eu.stratosphere.configuration.GlobalConfiguration;
import eu.stratosphere.nephele.jobmanager.JobManager;
/**
* This class sets up a web-server that contains a web frontend to display information about running jobs.
* It instantiates and configures an embedded jetty server.
*/
public class WebInfoServer {
/**
* The log for this class.
*/
private static final Log LOG = LogFactory.getLog(WebInfoServer.class);
/**
* The jetty server serving all requests.
*/
private final Server server;
/**
* Port for info server
*/
private int port;
/**
* Creates a new web info server. The server runs the servlets that implement the logic
* to list all present information concerning the job manager
*
* @param nepheleConfig
* The configuration for the nephele job manager.
* @param port
* The port to launch the server on.
* @throws IOException
* Thrown, if the server setup failed for an I/O related reason.
*/
public WebInfoServer(Configuration nepheleConfig, int port, JobManager jobmanager) throws IOException {
this.port = port;
// if no explicit configuration is given, use the global configuration
if (nepheleConfig == null) {
nepheleConfig = GlobalConfiguration.getConfiguration();
}
// get base path of Stratosphere installation
String basePath = nepheleConfig.getString(ConfigConstants.STRATOSPHERE_BASE_DIR_PATH_KEY, "");
String webDirPath = nepheleConfig.getString(ConfigConstants.JOB_MANAGER_WEB_ROOT_PATH_KEY, ConfigConstants.DEFAULT_JOB_MANAGER_WEB_ROOT_PATH);
String logDirPath = nepheleConfig.getString(ConfigConstants.JOB_MANAGER_WEB_LOG_PATH_KEY,
basePath+"/log");
File webDir;
if(webDirPath.startsWith("/")) {
// absolute path
webDir = new File(webDirPath);
} else {
// path relative to base dir
webDir = new File(basePath+"/"+webDirPath);
}
if (LOG.isInfoEnabled()) {
LOG.info("Setting up web info server, using web-root directory '" + webDir.getAbsolutePath() + "'.");
//LOG.info("Web info server will store temporary files in '" + tmpDir.getAbsolutePath());
LOG.info("Web info server will display information about nephele job-manager on "
+ nepheleConfig.getString(ConfigConstants.JOB_MANAGER_IPC_ADDRESS_KEY, null) + ", port "
+ port
+ ".");
}
// ensure that the directory with the web documents exists
if (!webDir.exists()) {
throw new FileNotFoundException("Cannot start jobmanager web info server. The directory containing the web documents does not exist: "
+ webDir.getAbsolutePath());
}
server = new Server(port);
// ----- the handlers for the servlets -----
ServletContextHandler servletContext = new ServletContextHandler(ServletContextHandler.SESSIONS);
servletContext.setContextPath("/");
servletContext.addServlet(new ServletHolder(new JobmanagerInfoServlet(jobmanager)), "/jobsInfo");
servletContext.addServlet(new ServletHolder(new LogfileInfoServlet(new File(logDirPath))), "/logInfo");
// ----- the handler serving all the static files -----
ResourceHandler resourceHandler = new ResourceHandler();
resourceHandler.setDirectoriesListed(false);
resourceHandler.setResourceBase(webDir.getAbsolutePath());
// ----- add the handlers to the list handler -----
HandlerList handlers = new HandlerList();
handlers.addHandler(servletContext);
handlers.addHandler(resourceHandler);
// ----- create the login module with http authentication -----
File af = null;
String authFile = nepheleConfig.getString(ConfigConstants.JOB_MANAGER_WEB_ACCESS_FILE_KEY, null);
if (authFile != null) {
af = new File(authFile);
if (!af.exists()) {
LOG.error("The specified file '" + af.getAbsolutePath()
+ "' with the authentication information is missing. Starting server without HTTP authentication.");
af = null;
}
}
if (af != null) {
HashLoginService loginService = new HashLoginService("Stratosphere Jobmanager Interface", authFile);
server.addBean(loginService);
Constraint constraint = new Constraint();
constraint.setName(Constraint.__BASIC_AUTH);
constraint.setAuthenticate(true);
constraint.setRoles(new String[] { "user" });
ConstraintMapping mapping = new ConstraintMapping();
mapping.setPathSpec("/*");
mapping.setConstraint(constraint);
ConstraintSecurityHandler sh = new ConstraintSecurityHandler();
sh.addConstraintMapping(mapping);
sh.setAuthenticator(new BasicAuthenticator());
sh.setLoginService(loginService);
sh.setStrict(true);
// set the handers: the server hands the request to the security handler,
// which hands the request to the other handlers when authenticated
sh.setHandler(handlers);
server.setHandler(sh);
} else {
server.setHandler(handlers);
}
}
/**
* Starts the web frontend server.
*
* @throws Exception
* Thrown, if the start fails.
*/
public void start() throws Exception {
LOG.info("Starting web info server for JobManager on port " + this.port);
server.start();
}
}