1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | |
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15 | package de.ugoe.cs.autoquest.httpmonitor.proxy; |
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16 | |
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17 | import javax.servlet.Servlet; |
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18 | |
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19 | import de.ugoe.cs.autoquest.httpmonitor.HttpMonitorComponent; |
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20 | import de.ugoe.cs.autoquest.httpmonitor.HttpMonitorException; |
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21 | import de.ugoe.cs.autoquest.httpmonitor.HttpMonitorExchangeHandler; |
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22 | import de.ugoe.cs.autoquest.httpmonitor.HttpMonitorLogManager; |
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23 | import de.ugoe.cs.autoquest.httpmonitor.HttpMonitorServer; |
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24 | import de.ugoe.cs.autoquest.httpmonitor.Runner; |
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25 | import de.ugoe.cs.autoquest.httpmonitor.ShutdownHook; |
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26 | import de.ugoe.cs.util.console.Console; |
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27 | |
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28 | /** |
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29 | * <p> |
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30 | * TODO comment |
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31 | * The HTML monitor starts a web server ({@link HttpMonitorServer}) that receives log messages |
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32 | * of the HTML monitor java script. These messages are logged using the |
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33 | * {@link ExchangeListenerManager}. The class assures that on shutdown e.g. caused by CTRL-C the |
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34 | * server and the log manager are stopped correctly. |
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35 | * </p> |
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36 | * |
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37 | * @author Patrick Harms |
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38 | */ |
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39 | public class HttpMonitoringProxy implements HttpMonitorComponent { |
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40 | |
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41 | /** |
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42 | * the port on which the webserver shall listen. |
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43 | */ |
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44 | private int port; |
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45 | |
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46 | /** |
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47 | * the web server receiving the log messages |
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48 | */ |
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49 | private HttpMonitorServer server; |
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50 | |
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51 | /** |
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52 | * the web server receiving the log messages |
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53 | */ |
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54 | private ExchangeListenerManager exchangeListenerManager; |
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55 | |
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56 | /** |
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57 | * |
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58 | */ |
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59 | private HttpMonitorExchangeHandler exchangeHandler; |
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60 | |
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61 | /** |
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62 | * the directory into which the log files shall be written |
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63 | */ |
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64 | private String logFileBaseDir; |
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65 | |
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66 | /** |
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67 | * the thread needed to handle CTRL-C events |
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68 | */ |
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69 | private Thread shutdownHook; |
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70 | |
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71 | /** */ |
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72 | private String proxiedServer; |
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73 | |
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74 | /** */ |
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75 | private int proxiedPort; |
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76 | |
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77 | /** */ |
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78 | private String httpMonitorServer; |
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79 | |
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80 | /** */ |
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81 | private int httpMonitorPort; |
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82 | |
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83 | /** |
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84 | * <p> |
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85 | * initializes the monitor with the command line arguments. Those may be the log directory |
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86 | * as first argument and the port to listen on as second |
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87 | * </p> |
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88 | * |
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89 | * @param commandLineArguments the command line arguments when starting the monitor using |
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90 | * the {@link Runner} |
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91 | */ |
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92 | public HttpMonitoringProxy(String[] commandLineArguments) { |
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93 | if (commandLineArguments.length != 4) { |
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94 | Console.printerrln("invalid number of command line parameters. Three are required:"); |
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95 | Console.printerrln(" 1. the port on which to listen"); |
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96 | Console.printerrln(" 2. the server and port to be proxied (format \"host:port\")"); |
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97 | Console.printerrln |
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98 | (" 3. variant a: the value \"local\" for logging recorded exchanges locally"); |
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99 | Console.printerrln |
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100 | (" variant b: the server and port of the HTTP monitor to send the recorded\n" + |
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101 | " exchanges to (format \"host:port\")"); |
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102 | throw new IllegalArgumentException(); |
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103 | } |
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104 | |
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105 | this.logFileBaseDir = commandLineArguments[0]; |
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106 | |
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107 | try { |
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108 | this.port = Integer.parseInt(commandLineArguments[1]); |
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109 | } |
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110 | catch (NumberFormatException e) { |
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111 | Console.printerrln("invalid port specification " + commandLineArguments[1]); |
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112 | } |
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113 | Console.println("listening on port " + this.port); |
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114 | |
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115 | proxiedServer = commandLineArguments[2]; |
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116 | |
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117 | int index = proxiedServer.indexOf(':'); |
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118 | if (index > -1) { |
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119 | try { |
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120 | proxiedPort = Integer.parseInt(proxiedServer.substring(index + 1)); |
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121 | } |
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122 | catch (NumberFormatException e) { |
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123 | Console.printerrln |
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124 | ("invalid port specification " + proxiedServer.substring(index + 1)); |
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125 | } |
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126 | |
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127 | proxiedServer = proxiedServer.substring(0, index); |
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128 | } |
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129 | else { |
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130 | proxiedPort = 80; |
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131 | } |
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132 | |
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133 | Console.println("proxing " + proxiedServer + ":" + proxiedPort); |
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134 | |
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135 | httpMonitorServer = commandLineArguments[3]; |
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136 | |
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137 | index = httpMonitorServer.indexOf(':'); |
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138 | if (index > -1) { |
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139 | try { |
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140 | httpMonitorPort = Integer.parseInt(httpMonitorServer.substring(index + 1)); |
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141 | } |
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142 | catch (NumberFormatException e) { |
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143 | Console.printerrln |
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144 | ("invalid port specification " + httpMonitorServer.substring(index + 1)); |
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145 | } |
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146 | |
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147 | httpMonitorServer = httpMonitorServer.substring(0, index); |
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148 | } |
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149 | else if ("local".equals(httpMonitorServer)) { |
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150 | httpMonitorServer = null; |
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151 | } |
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152 | else { |
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153 | httpMonitorPort = 80; |
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154 | } |
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155 | |
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156 | if (httpMonitorServer != null) { |
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157 | Console.println("sending log data to " + httpMonitorServer + ":" + httpMonitorPort); |
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158 | exchangeHandler = |
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159 | new HttpMonitorRemoteExchangeHandler(httpMonitorServer, httpMonitorPort); |
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160 | } |
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161 | else { |
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162 | Console.println("storing logs locally into directory " + logFileBaseDir); |
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163 | exchangeHandler = new HttpMonitorLogManager(logFileBaseDir); |
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164 | } |
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165 | } |
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166 | |
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167 | /* (non-Javadoc) |
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168 | * @see de.ugoe.cs.autoquest.htmlmonitor.HttpMonitorComponent#init() |
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169 | */ |
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170 | @Override |
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171 | public synchronized void init() throws HttpMonitorException { |
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172 | if (server != null) { |
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173 | throw new IllegalStateException("already initialized."); |
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174 | } |
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175 | |
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176 | exchangeHandler.init(); |
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177 | |
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178 | exchangeListenerManager = new ExchangeListenerManager(exchangeHandler); |
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179 | exchangeListenerManager.init(); |
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180 | |
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181 | Servlet servlet = |
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182 | new HttpMonitoringProxyServlet(proxiedServer, proxiedPort, exchangeListenerManager); |
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183 | server = new HttpMonitorServer(port, servlet); |
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184 | server.init(); |
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185 | |
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186 | shutdownHook = new Thread |
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187 | (new ShutdownHook(server, exchangeListenerManager, exchangeHandler)); |
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188 | } |
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189 | |
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190 | /* (non-Javadoc) |
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191 | * @see de.ugoe.cs.autoquest.htmlmonitor.HttpMonitorComponent#start() |
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192 | */ |
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193 | @Override |
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194 | public synchronized void start() { |
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195 | if ((exchangeHandler == null) || (exchangeListenerManager == null) || (server == null)) { |
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196 | throw new IllegalStateException("not initialized."); |
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197 | } |
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198 | |
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199 | try { |
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200 | Runtime.getRuntime().addShutdownHook(shutdownHook); |
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201 | exchangeHandler.start(); |
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202 | exchangeListenerManager.start(); |
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203 | server.start(); |
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204 | } |
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205 | catch (HttpMonitorException e) { |
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206 | Console.printerrln("could not start HTTP monitoring proxy: " + e); |
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207 | Console.logException(e); |
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208 | } |
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209 | } |
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210 | |
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211 | /* (non-Javadoc) |
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212 | * @see de.ugoe.cs.autoquest.htmlmonitor.HttpMonitorComponent#stop() |
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213 | */ |
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214 | @Override |
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215 | public synchronized void stop() { |
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216 | if ((exchangeHandler == null) || (exchangeListenerManager == null) || (server == null)) { |
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217 | throw new IllegalStateException("not initialized."); |
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218 | } |
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219 | |
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220 | Runtime.getRuntime().removeShutdownHook(shutdownHook); |
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221 | server.stop(); |
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222 | exchangeListenerManager.stop(); |
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223 | exchangeHandler.stop(); |
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224 | |
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225 | server = null; |
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226 | exchangeListenerManager = null; |
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227 | exchangeHandler = null; |
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228 | } |
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229 | |
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230 | } |
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