/**
* 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.hadoop.http;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.BindException;
import java.net.InetSocketAddress;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.nio.channels.ServerSocketChannel;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.log.LogLevel;
import org.apache.hadoop.util.ReflectionUtils;
import org.mortbay.jetty.Connector;
import org.mortbay.jetty.Handler;
import org.mortbay.jetty.Server;
import org.mortbay.jetty.handler.ContextHandlerCollection;
import org.mortbay.jetty.nio.SelectChannelConnector;
import org.mortbay.jetty.security.SslSocketConnector;
import org.mortbay.jetty.servlet.Context;
import org.mortbay.jetty.servlet.DefaultServlet;
import org.mortbay.jetty.servlet.FilterHolder;
import org.mortbay.jetty.servlet.FilterMapping;
import org.mortbay.jetty.servlet.ServletHandler;
import org.mortbay.jetty.servlet.ServletHolder;
import org.mortbay.jetty.webapp.WebAppContext;
import org.mortbay.thread.QueuedThreadPool;
import org.mortbay.util.MultiException;
/**
* Create a Jetty embedded server to answer http requests. The primary goal
* is to serve up status information for the server.
* There are three contexts:
* "/logs/" -> points to the log directory
* "/static/" -> points to common static files (src/webapps/static)
* "/" -> the jsp server code from (src/webapps/<name>)
*/
public class HttpServer implements FilterContainer {
public static final Log LOG = LogFactory.getLog(HttpServer.class);
static final String FILTER_INITIALIZER_PROPERTY
= "hadoop.http.filter.initializers";
protected final Server webServer;
protected final Connector listener;
protected final WebAppContext webAppContext;
protected final boolean findPort;
protected final Map<Context, Boolean> defaultContexts =
new HashMap<Context, Boolean>();
protected final List<String> filterNames = new ArrayList<String>();
private static final int MAX_RETRIES = 10;
/** Same as this(name, bindAddress, port, findPort, null); */
public HttpServer(String name, String bindAddress, int port, boolean findPort
) throws IOException {
this(name, bindAddress, port, findPort, new Configuration());
}
/**
* Create a status server on the given port.
* The jsp scripts are taken from src/webapps/<name>.
* @param name The name of the server
* @param port The port to use on the server
* @param findPort whether the server should start at the given port and
* increment by 1 until it finds a free port.
* @param conf Configuration
*/
public HttpServer(String name, String bindAddress, int port,
boolean findPort, Configuration conf) throws IOException {
webServer = new Server();
this.findPort = findPort;
listener = createBaseListener(conf);
listener.setHost(bindAddress);
listener.setPort(port);
webServer.addConnector(listener);
webServer.setThreadPool(new QueuedThreadPool());
final String appDir = getWebAppsPath();
ContextHandlerCollection contexts = new ContextHandlerCollection();
webServer.setHandler(contexts);
webAppContext = new WebAppContext();
webAppContext.setContextPath("/");
webAppContext.setWar(appDir + "/" + name);
webServer.addHandler(webAppContext);
addDefaultApps(contexts, appDir);
final FilterInitializer[] initializers = getFilterInitializers(conf);
if (initializers != null) {
for(FilterInitializer c : initializers) {
c.initFilter(this);
}
}
addDefaultServlets();
}
/**
* Create a required listener for the Jetty instance listening on the port
* provided. This wrapper and all subclasses must create at least one
* listener.
*/
protected Connector createBaseListener(Configuration conf)
throws IOException {
SelectChannelConnector ret = new SelectChannelConnector();
ret.setLowResourceMaxIdleTime(10000);
ret.setAcceptQueueSize(128);
ret.setResolveNames(false);
ret.setUseDirectBuffers(false);
return ret;
}
/** Get an array of FilterConfiguration specified in the conf */
private static FilterInitializer[] getFilterInitializers(Configuration conf) {
if (conf == null) {
return null;
}
Class<?>[] classes = conf.getClasses(FILTER_INITIALIZER_PROPERTY);
if (classes == null) {
return null;
}
FilterInitializer[] initializers = new FilterInitializer[classes.length];
for(int i = 0; i < classes.length; i++) {
initializers[i] = (FilterInitializer)ReflectionUtils.newInstance(
classes[i], conf);
}
return initializers;
}
/**
* Add default apps.
* @param appDir The application directory
* @throws IOException
*/
protected void addDefaultApps(ContextHandlerCollection parent,
final String appDir) throws IOException {
// set up the context for "/logs/" if "hadoop.log.dir" property is defined.
String logDir = System.getProperty("hadoop.log.dir");
if (logDir != null) {
Context logContext = new Context(parent, "/logs");
logContext.setResourceBase(logDir);
logContext.addServlet(DefaultServlet.class, "/");
defaultContexts.put(logContext, true);
}
// set up the context for "/static/*"
Context staticContext = new Context(parent, "/static");
staticContext.setResourceBase(appDir + "/static");
staticContext.addServlet(DefaultServlet.class, "/*");
defaultContexts.put(staticContext, true);
}
/**
* Add default servlets.
*/
protected void addDefaultServlets() {
// set up default servlets
addServlet("stacks", "/stacks", StackServlet.class);
addServlet("logLevel", "/logLevel", LogLevel.Servlet.class);
}
public void addContext(Context ctxt, boolean isFiltered)
throws IOException {
webServer.addHandler(ctxt);
defaultContexts.put(ctxt, isFiltered);
}
/**
* Add a context
* @param pathSpec The path spec for the context
* @param dir The directory containing the context
* @param isFiltered if true, the servlet is added to the filter path mapping
* @throws IOException
*/
protected void addContext(String pathSpec, String dir, boolean isFiltered) throws IOException {
if (0 == webServer.getHandlers().length) {
throw new RuntimeException("Couldn't find handler");
}
WebAppContext webAppCtx = new WebAppContext();
webAppCtx.setContextPath(pathSpec);
webAppCtx.setWar(dir);
addContext(webAppCtx, true);
}
/**
* Set a value in the webapp context. These values are available to the jsp
* pages as "application.getAttribute(name)".
* @param name The name of the attribute
* @param value The value of the attribute
*/
public void setAttribute(String name, Object value) {
webAppContext.setAttribute(name, value);
}
/**
* Add a servlet in the server.
* @param name The name of the servlet (can be passed as null)
* @param pathSpec The path spec for the servlet
* @param clazz The servlet class
*/
public void addServlet(String name, String pathSpec,
Class<? extends HttpServlet> clazz) {
addInternalServlet(name, pathSpec, clazz);
addFilterPathMapping(pathSpec, webAppContext);
}
/**
* Add an internal servlet in the server.
* @param name The name of the servlet (can be passed as null)
* @param pathSpec The path spec for the servlet
* @param clazz The servlet class
* @deprecated this is a temporary method
*/
@Deprecated
public void addInternalServlet(String name, String pathSpec,
Class<? extends HttpServlet> clazz) {
ServletHolder holder = new ServletHolder(clazz);
if (name != null) {
holder.setName(name);
}
webAppContext.addServlet(holder, pathSpec);
}
/** {@inheritDoc} */
public void addFilter(String name, String classname,
Map<String, String> parameters) {
final String[] USER_FACING_URLS = { "*.html", "*.jsp" };
defineFilter(webAppContext, name, classname, parameters, USER_FACING_URLS);
final String[] ALL_URLS = { "/*" };
for (Map.Entry<Context, Boolean> e : defaultContexts.entrySet()) {
if (e.getValue()) {
Context ctx = e.getKey();
defineFilter(ctx, name, classname, parameters, ALL_URLS);
LOG.info("Added filter " + name + " (class=" + classname
+ ") to context " + ctx.getDisplayName());
}
}
filterNames.add(name);
}
/** {@inheritDoc} */
public void addGlobalFilter(String name, String classname,
Map<String, String> parameters) {
final String[] ALL_URLS = { "/*" };
defineFilter(webAppContext, name, classname, parameters, ALL_URLS);
for (Context ctx : defaultContexts.keySet()) {
defineFilter(ctx, name, classname, parameters, ALL_URLS);
}
LOG.info("Added global filter" + name + " (class=" + classname + ")");
}
/**
* Define a filter for a context and set up default url mappings.
*/
protected void defineFilter(Context ctx, String name,
String classname, Map<String,String> parameters, String[] urls) {
FilterHolder holder = new FilterHolder();
holder.setName(name);
holder.setClassName(classname);
holder.setInitParameters(parameters);
FilterMapping fmap = new FilterMapping();
fmap.setPathSpecs(urls);
fmap.setDispatches(Handler.ALL);
fmap.setFilterName(name);
ServletHandler handler = ctx.getServletHandler();
handler.addFilter(holder, fmap);
}
/**
* Add the path spec to the filter path mapping.
* @param pathSpec The path spec
* @param webAppCtx The WebApplicationContext to add to
*/
protected void addFilterPathMapping(String pathSpec,
Context webAppCtx) {
ServletHandler handler = webAppCtx.getServletHandler();
for(String name : filterNames) {
FilterMapping fmap = new FilterMapping();
fmap.setPathSpec(pathSpec);
fmap.setFilterName(name);
fmap.setDispatches(Handler.ALL);
handler.addFilterMapping(fmap);
}
}
/**
* Get the value in the webapp context.
* @param name The name of the attribute
* @return The value of the attribute
*/
public Object getAttribute(String name) {
return webAppContext.getAttribute(name);
}
/**
* Get the pathname to the webapps files.
* @return the pathname as a URL
* @throws IOException if 'webapps' directory cannot be found on CLASSPATH.
*/
protected String getWebAppsPath() throws IOException {
URL url = getClass().getClassLoader().getResource("webapps");
if (url == null)
throw new IOException("webapps not found in CLASSPATH");
return url.toString();
}
/**
* Get the port that the server is on
* @return the port
*/
public int getPort() {
return webServer.getConnectors()[0].getLocalPort();
}
/**
* Set the min, max number of worker threads (simultaneous connections).
*/
public void setThreads(int min, int max) {
QueuedThreadPool pool = (QueuedThreadPool) webServer.getThreadPool() ;
pool.setMinThreads(min);
pool.setMaxThreads(max);
}
/**
* Configure an ssl listener on the server.
* @param addr address to listen on
* @param keystore location of the keystore
* @param storPass password for the keystore
* @param keyPass password for the key
* @deprecated Use {@link #addSslListener(InetSocketAddress, Configuration, boolean)}
*/
@Deprecated
public void addSslListener(InetSocketAddress addr, String keystore,
String storPass, String keyPass) throws IOException {
if (webServer.isStarted()) {
throw new IOException("Failed to add ssl listener");
}
SslSocketConnector sslListener = new SslSocketConnector();
sslListener.setHost(addr.getHostName());
sslListener.setPort(addr.getPort());
sslListener.setKeystore(keystore);
sslListener.setPassword(storPass);
sslListener.setKeyPassword(keyPass);
webServer.addConnector(sslListener);
}
/**
* Configure an ssl listener on the server.
* @param addr address to listen on
* @param sslConf conf to retrieve ssl options
* @param needClientAuth whether client authentication is required
*/
public void addSslListener(InetSocketAddress addr, Configuration sslConf,
boolean needClientAuth) throws IOException {
if (webServer.isStarted()) {
throw new IOException("Failed to add ssl listener");
}
if (needClientAuth) {
// setting up SSL truststore for authenticating clients
System.setProperty("javax.net.ssl.trustStore", sslConf.get(
"ssl.server.truststore.location", ""));
System.setProperty("javax.net.ssl.trustStorePassword", sslConf.get(
"ssl.server.truststore.password", ""));
System.setProperty("javax.net.ssl.trustStoreType", sslConf.get(
"ssl.server.truststore.type", "jks"));
}
SslSocketConnector sslListener = new SslSocketConnector();
sslListener.setHost(addr.getHostName());
sslListener.setPort(addr.getPort());
sslListener.setKeystore(sslConf.get("ssl.server.keystore.location"));
sslListener.setPassword(sslConf.get("ssl.server.keystore.password", ""));
sslListener.setKeyPassword(sslConf.get("ssl.server.keystore.keypassword", ""));
sslListener.setKeystoreType(sslConf.get("ssl.server.keystore.type", "jks"));
sslListener.setNeedClientAuth(needClientAuth);
webServer.addConnector(sslListener);
}
/**
* Start the server. Does not wait for the server to start.
*/
public void start() throws IOException {
try {
int port = 0;
int oriPort = listener.getPort(); // The original requested port
while (true) {
try {
port = webServer.getConnectors()[0].getLocalPort();
LOG.info("Port returned by webServer.getConnectors()[0]." +
"getLocalPort() before open() is "+ port +
". Opening the listener on " + oriPort);
listener.open();
port = listener.getLocalPort();
LOG.info("listener.getLocalPort() returned " + listener.getLocalPort() +
" webServer.getConnectors()[0].getLocalPort() returned " +
webServer.getConnectors()[0].getLocalPort());
//Workaround to handle the problem reported in HADOOP-4744
if (port < 0) {
Thread.sleep(100);
int numRetries = 1;
while (port < 0) {
LOG.warn("listener.getLocalPort returned " + port);
if (numRetries++ > MAX_RETRIES) {
throw new Exception(" listener.getLocalPort is returning " +
"less than 0 even after " +numRetries+" resets");
}
for (int i = 0; i < 2; i++) {
LOG.info("Retrying listener.getLocalPort()");
port = listener.getLocalPort();
if (port > 0) {
break;
}
Thread.sleep(200);
}
if (port > 0) {
break;
}
LOG.info("Bouncing the listener");
listener.close();
Thread.sleep(1000);
listener.setPort(oriPort == 0 ? 0 : (oriPort += 1));
listener.open();
Thread.sleep(100);
port = listener.getLocalPort();
}
} //Workaround end
LOG.info("Jetty bound to port " + port);
webServer.start();
// Workaround for HADOOP-6386
port = listener.getLocalPort();
if (port < 0) {
LOG.warn("Bounds port is " + port + " after webserver start");
for (int i = 0; i < MAX_RETRIES/2; i++) {
try {
webServer.stop();
} catch (Exception e) {
LOG.warn("Can't stop web-server", e);
}
Thread.sleep(1000);
listener.setPort(oriPort == 0 ? 0 : (oriPort += 1));
listener.open();
Thread.sleep(100);
webServer.start();
LOG.info(i + "attempts to restart webserver");
port = listener.getLocalPort();
if (port > 0)
break;
}
if (port < 0)
throw new Exception("listener.getLocalPort() is returning " +
"less than 0 even after " +MAX_RETRIES+" resets");
}
// End of HADOOP-6386 workaround
break;
} catch (IOException ex) {
// if this is a bind exception,
// then try the next port number.
if (ex instanceof BindException) {
if (!findPort) {
throw (BindException) ex;
}
} else {
LOG.info("HttpServer.start() threw a non Bind IOException");
throw ex;
}
} catch (MultiException ex) {
LOG.info("HttpServer.start() threw a MultiException");
throw ex;
}
listener.setPort((oriPort += 1));
}
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw new IOException("Problem starting http server", e);
}
}
/**
* stop the server
*/
public void stop() throws Exception {
listener.close();
webServer.stop();
}
public void join() throws InterruptedException {
webServer.join();
}
/**
* A very simple servlet to serve up a text representation of the current
* stack traces. It both returns the stacks to the caller and logs them.
* Currently the stack traces are done sequentially rather than exactly the
* same data.
*/
public static class StackServlet extends HttpServlet {
private static final long serialVersionUID = -6284183679759467039L;
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = new PrintWriter(response.getOutputStream());
ReflectionUtils.printThreadInfo(out, "");
out.close();
ReflectionUtils.logThreadInfo(LOG, "jsp requested", 1);
}
}
}