1 /** 2 * Copyright 2010 The Apache Software Foundation 3 * 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21 package org.apache.hadoop.hbase.util; 22 23 import org.apache.hadoop.http.HttpServer; 24 import org.mortbay.jetty.handler.ContextHandlerCollection; 25 import org.mortbay.jetty.servlet.Context; 26 import org.mortbay.jetty.servlet.DefaultServlet; 27 28 import java.io.IOException; 29 import java.net.URL; 30 import java.util.Map; 31 32 /** 33 * Create a Jetty embedded server to answer http requests. The primary goal 34 * is to serve up status information for the server. 35 * There are three contexts: 36 * "/stacks/" -> points to stack trace 37 * "/static/" -> points to common static files (src/hbase-webapps/static) 38 * "/" -> the jsp server code from (src/hbase-webapps/<name>) 39 */ 40 public class InfoServer extends HttpServer { 41 /** 42 * Create a status server on the given port. 43 * The jsp scripts are taken from src/hbase-webapps/<code>name<code>. 44 * @param name The name of the server 45 * @param bindAddress address to bind to 46 * @param port The port to use on the server 47 * @param findPort whether the server should start at the given port and 48 * increment by 1 until it finds a free port. 49 * @throws IOException e 50 */ 51 public InfoServer(String name, String bindAddress, int port, boolean findPort) 52 throws IOException { 53 super(name, bindAddress, port, findPort); 54 webServer.addHandler(new ContextHandlerCollection()); 55 } 56 57 protected void addDefaultApps(ContextHandlerCollection parent, String appDir) 58 throws IOException { 59 super.addDefaultApps(parent, appDir); 60 // Must be same as up in hadoop. 61 final String logsContextPath = "/logs"; 62 // Now, put my logs in place of hadoops... disable old one first. 63 Context oldLogsContext = null; 64 for (Map.Entry<Context, Boolean> e : defaultContexts.entrySet()) { 65 if (e.getKey().getContextPath().equals(logsContextPath)) { 66 oldLogsContext = e.getKey(); 67 break; 68 } 69 } 70 if (oldLogsContext != null) { 71 this.defaultContexts.put(oldLogsContext, Boolean.FALSE); 72 } 73 // Now do my logs. 74 // set up the context for "/logs/" if "hadoop.log.dir" property is defined. 75 String logDir = System.getProperty("hbase.log.dir"); 76 if (logDir != null) { 77 Context logContext = new Context(parent, "/logs"); 78 logContext.setResourceBase(logDir); 79 logContext.addServlet(DefaultServlet.class, "/"); 80 defaultContexts.put(logContext, true); 81 } 82 } 83 84 /** 85 * Get the pathname to the <code>path</code> files. 86 * @return the pathname as a URL 87 */ 88 @Override 89 protected String getWebAppsPath() throws IOException { 90 // Hack: webapps is not a unique enough element to find in CLASSPATH 91 // We'll more than likely find the hadoop webapps dir. So, instead 92 // look for the 'master' webapp in the webapps subdir. That should 93 // get us the hbase context. Presumption is that place where the 94 // master webapp resides is where we want this InfoServer picking up 95 // web applications. 96 final String master = "master"; 97 String p = getWebAppDir(master); 98 // Now strip master + the separator off the end of our context 99 return p.substring(0, p.length() - (master.length() + 1/* The separator*/)); 100 } 101 102 private static String getWebAppsPath(final String path) 103 throws IOException { 104 URL url = InfoServer.class.getClassLoader().getResource(path); 105 if (url == null) 106 throw new IOException("hbase-webapps not found in CLASSPATH: " + path); 107 return url.toString(); 108 } 109 110 /** 111 * Get the path for this web app 112 * @param webappName web app 113 * @return path 114 * @throws IOException e 115 */ 116 public static String getWebAppDir(final String webappName) 117 throws IOException { 118 String webappDir; 119 webappDir = getWebAppsPath("hbase-webapps/" + webappName); 120 return webappDir; 121 } 122 }