/***********************************************************************************************************************
* 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.client.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.ContextHandler;
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;
/**
* This class sets up the web-server that serves the web frontend. It instantiates and
* configures an embedded jetty server.
*/
public class WebInterfaceServer {
/**
* The log for this class.
*/
private static final Log LOG = LogFactory.getLog(WebInterfaceServer.class);
/**
* The jetty server serving all requests.
*/
private final Server server;
/**
* Creates a new web interface server. The server runs the servlets that implement the logic
* to upload, list, delete and submit jobs, to compile them and to show the optimizer plan.
* It serves the asynchronous requests for the plans and all other static resources, like
* static web pages, stylesheets or javascript files.
*
* @param nepheleConfig
* The configuration for the nephele job manager. All compiled jobs will be sent
* to the manager described by this configuration.
* @param port
* The port to launch the server on.
* @throws IOException
* Thrown, if the server setup failed for an I/O related reason.
*/
public WebInterfaceServer(Configuration nepheleConfig, int port)
throws IOException {
Configuration config = GlobalConfiguration.getConfiguration();
// if no explicit configuration is given, use the global configuration
if (nepheleConfig == null) {
nepheleConfig = config;
}
// get base path of Stratosphere installation
String basePath = nepheleConfig.getString(ConfigConstants.STRATOSPHERE_BASE_DIR_PATH_KEY,"");
File webDir;
File tmpDir;
File uploadDir;
File planDumpDir;
String webDirPath = config.getString(ConfigConstants.WEB_ROOT_PATH_KEY,
ConfigConstants.DEFAULT_WEB_ROOT_DIR);
if(webDirPath.startsWith("/")) {
// absolute path
webDir = new File(webDirPath);
} else {
// path relative to base dir
webDir = new File(basePath+"/"+webDirPath);
}
String tmpDirPath = config.getString(ConfigConstants.WEB_TMP_DIR_KEY,
ConfigConstants.DEFAULT_WEB_TMP_DIR);
tmpDir = new File(tmpDirPath);
if(tmpDir.isAbsolute()) {
// absolute path, everything all right
} else {
// path relative to base dir
tmpDir = new File(basePath+"/"+tmpDirPath);
}
String uploadDirPath = config.getString(ConfigConstants.WEB_JOB_UPLOAD_DIR_KEY,
ConfigConstants.DEFAULT_WEB_JOB_STORAGE_DIR);
uploadDir = new File(uploadDirPath);
if(uploadDir.isAbsolute()) {
// absolute path, everything peachy
} else {
// path relative to base dir
uploadDir = new File(basePath+"/"+uploadDirPath);
}
String planDumpDirPath = config.getString(ConfigConstants.WEB_PLAN_DUMP_DIR_KEY,
ConfigConstants.DEFAULT_WEB_PLAN_DUMP_DIR);
planDumpDir = new File(planDumpDirPath);
if(planDumpDir.isAbsolute()) {
// absolute path, nice and dandy
} else {
// path relative to base dir
planDumpDir = new File(basePath+"/"+planDumpDirPath);
}
if (LOG.isInfoEnabled()) {
LOG.info("Setting up web frontend server, using web-root directory '" + webDir.getAbsolutePath() + "'.");
LOG.info("Web frontend server will store temporary files in '" + tmpDir.getAbsolutePath()
+ "', uploaded jobs in '" + uploadDir.getAbsolutePath() + "', plan-json-dumps in '"
+ planDumpDir.getAbsolutePath() + "'.");
LOG.info("Web-frontend will submit jobs to nephele job-manager on "
+ config.getString(ConfigConstants.JOB_MANAGER_IPC_ADDRESS_KEY, null) + ", port "
+ config.getInteger(ConfigConstants.JOB_MANAGER_IPC_PORT_KEY, ConfigConstants.DEFAULT_JOB_MANAGER_IPC_PORT)
+ ".");
}
server = new Server(port);
// ensure that the directory with the web documents exists
if (!webDir.exists()) {
throw new FileNotFoundException("The directory containing the web documents does not exist: "
+ webDir.getAbsolutePath());
}
// ensure, that all the directories exist
checkAndCreateDirectories(tmpDir, true);
checkAndCreateDirectories(uploadDir, true);
checkAndCreateDirectories(planDumpDir, true);
int jobManagerWebPort = config.getInteger(ConfigConstants.JOB_MANAGER_WEB_PORT_KEY, ConfigConstants.DEFAULT_JOB_MANAGER_WEB_FRONTEND_PORT);
// ----- the handlers for the servlets -----
ServletContextHandler servletContext = new ServletContextHandler(ServletContextHandler.SESSIONS);
servletContext.setContextPath("/");
servletContext.addServlet(new ServletHolder(new PactJobJSONServlet(uploadDir)), "/pactPlan");
servletContext.addServlet(new ServletHolder(new JobsInfoServlet(nepheleConfig)), "/jobsInfo");
servletContext.addServlet(new ServletHolder(new PlanDisplayServlet(jobManagerWebPort)), "/showPlan");
servletContext.addServlet(new ServletHolder(new JobsServlet(uploadDir, tmpDir, "launch.html")), "/jobs");
servletContext.addServlet(new ServletHolder(new JobSubmissionServlet(nepheleConfig, uploadDir, planDumpDir)),
"/runJob");
// ----- the hander serving the written pact plans -----
ResourceHandler pactPlanHandler = new ResourceHandler();
pactPlanHandler.setDirectoriesListed(false);
pactPlanHandler.setResourceBase(planDumpDir.getAbsolutePath());
ContextHandler pactPlanContext = new ContextHandler();
pactPlanContext.setContextPath("/ajax-plans");
pactPlanContext.setHandler(pactPlanHandler);
// ----- 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(pactPlanContext);
handlers.addHandler(resourceHandler);
// ----- create the login module with http authentication -----
File af = null;
String authFile = config.getString(ConfigConstants.WEB_ACCESS_FILE_KEY,
ConfigConstants.DEFAULT_WEB_ACCESS_FILE_PATH);
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 Query Engine 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 {
server.start();
}
/**
* Lets the calling thread wait until the server terminates its operation.
*
* @throws InterruptedException
* Thrown, if the calling thread is interrupted.
*/
public void join() throws InterruptedException {
server.join();
}
/**
* Checks and creates the directory described by the abstract directory path. This function checks
* if the directory exists and creates it if necessary. It also checks read permissions and
* write permission, if necessary.
*
* @param dir
* The String describing the directory path.
* @param needWritePermission
* A flag indicating whether to check write access.
* @throws IOException
* Thrown, if the directory could not be created, or if one of the checks failed.
*/
private final void checkAndCreateDirectories(File f, boolean needWritePermission) throws IOException {
String dir = f.getAbsolutePath();
// check if it exists and it is not a directory
if (f.exists() && !f.isDirectory()) {
throw new IOException("A none directory file with the same name as the configured directory '" + dir
+ "' already exists.");
}
// try to create the directory
if (!f.exists()) {
if (!f.mkdirs()) {
throw new IOException("Could not create the directory '" + dir + "'.");
}
}
// check the read and execute permission
if (!(f.canRead() && f.canExecute())) {
throw new IOException("The directory '" + dir + "' cannot be read and listed.");
}
// check the write permission
if (needWritePermission && !f.canWrite()) {
throw new IOException("No write access could be obtained on directory '" + dir + "'.");
}
}
}