/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hcatalog.templeton;
import com.sun.jersey.api.core.PackagesResourceConfig;
import com.sun.jersey.spi.container.servlet.ServletContainer;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hdfs.web.AuthFilter;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.GenericOptionsParser;
import org.eclipse.jetty.rewrite.handler.RedirectPatternRule;
import org.eclipse.jetty.rewrite.handler.RewriteHandler;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.HandlerList;
import org.eclipse.jetty.servlet.FilterHolder;
import org.eclipse.jetty.servlet.FilterMapping;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import org.slf4j.bridge.SLF4JBridgeHandler;
/**
* The main executable that starts up and runs the Server.
*/
public class Main {
public static final String SERVLET_PATH = "templeton";
private static final Log LOG = LogFactory.getLog(Main.class);
public static final int DEFAULT_PORT = 8080;
private static volatile AppConfig conf;
/**
* Retrieve the config singleton.
*/
public static synchronized AppConfig getAppConfigInstance() {
if (conf == null)
LOG.error("Bug: configuration not yet loaded");
return conf;
}
public Main(String[] args) {
init(args);
}
public void init(String[] args) {
initLogger();
conf = loadConfig(args);
conf.startCleanup();
LOG.debug("Loaded conf " + conf);
}
// Jersey uses java.util.logging - bridge to slf4
private void initLogger() {
java.util.logging.Logger rootLogger
= java.util.logging.LogManager.getLogManager().getLogger("");
for (java.util.logging.Handler h : rootLogger.getHandlers())
rootLogger.removeHandler(h);
SLF4JBridgeHandler.install();
}
public AppConfig loadConfig(String[] args) {
AppConfig cf = new AppConfig();
try {
GenericOptionsParser parser = new GenericOptionsParser(cf, args);
if (parser.getRemainingArgs().length > 0)
usage();
} catch (IOException e) {
LOG.error("Unable to parse options: " + e);
usage();
}
return cf;
}
public void usage() {
System.err.println("usage: templeton [-Dtempleton.port=N] [-D...]");
System.exit(1);
}
public void run() {
int port = conf.getInt(AppConfig.PORT, DEFAULT_PORT);
try {
checkEnv();
runServer(port);
System.out.println("templeton: listening on port " + port);
LOG.info("Templeton listening on port " + port);
} catch (Exception e) {
System.err.println("templeton: Server failed to start: " + e.getMessage());
LOG.fatal("Server failed to start: " + e);
System.exit(1);
}
}
private void checkEnv() {
checkCurrentDirPermissions();
}
private void checkCurrentDirPermissions() {
//org.apache.commons.exec.DefaultExecutor requires
// that current directory exists
File pwd = new File(".");
if (!pwd.exists()) {
String msg = "Server failed to start: templeton: Current working directory '.' does not exist!";
System.err.println(msg);
LOG.fatal(msg);
System.exit(1);
}
}
public Server runServer(int port)
throws Exception {
//Authenticate using keytab
if (UserGroupInformation.isSecurityEnabled()) {
UserGroupInformation.loginUserFromKeytab(conf.kerberosPrincipal(),
conf.kerberosKeytab());
}
// Create the Jetty server
Server server = new Server(port);
ServletContextHandler root = new ServletContextHandler(server, "/");
// Add the Auth filter
root.addFilter(makeAuthFilter(), "/*", FilterMapping.REQUEST);
// Connect Jersey
ServletHolder h = new ServletHolder(new ServletContainer(makeJerseyConfig()));
root.addServlet(h, "/" + SERVLET_PATH + "/*");
// Add any redirects
addRedirects(server);
// Start the server
server.start();
return server;
}
// Configure the AuthFilter with the Kerberos params iff security
// is enabled.
public FilterHolder makeAuthFilter() {
FilterHolder authFilter = new FilterHolder(AuthFilter.class);
if (UserGroupInformation.isSecurityEnabled()) {
authFilter.setInitParameter("dfs.web.authentication.signature.secret",
conf.kerberosSecret());
authFilter.setInitParameter("dfs.web.authentication.kerberos.principal",
conf.kerberosPrincipal());
authFilter.setInitParameter("dfs.web.authentication.kerberos.keytab",
conf.kerberosKeytab());
}
return authFilter;
}
public PackagesResourceConfig makeJerseyConfig() {
PackagesResourceConfig rc
= new PackagesResourceConfig("org.apache.hcatalog.templeton");
HashMap<String, Object> props = new HashMap<String, Object>();
props.put("com.sun.jersey.api.json.POJOMappingFeature", "true");
props.put("com.sun.jersey.config.property.WadlGeneratorConfig",
"org.apache.hcatalog.templeton.WadlConfig");
rc.setPropertiesAndFeatures(props);
return rc;
}
public void addRedirects(Server server) {
RewriteHandler rewrite = new RewriteHandler();
RedirectPatternRule redirect = new RedirectPatternRule();
redirect.setPattern("/templeton/v1/application.wadl");
redirect.setLocation("/templeton/application.wadl");
rewrite.addRule(redirect);
HandlerList handlerlist = new HandlerList();
ArrayList<Handler> handlers = new ArrayList<Handler>();
// Any redirect handlers need to be added first
handlers.add(rewrite);
// Now add all the default handlers
for (Handler handler : server.getHandlers()) {
handlers.add(handler);
}
Handler[] newlist = new Handler[handlers.size()];
handlerlist.setHandlers(handlers.toArray(newlist));
server.setHandler(handlerlist);
}
public static void main(String[] args) {
Main templeton = new Main(args);
templeton.run();
}
}