HttpServer.java
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上传日期:2018-01-08
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- /**
- * 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.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 {
- listener.open();
- port = listener.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();
- 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);
- }
- }
- }