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 java.io.IOException; |
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18 | import java.io.OutputStreamWriter; |
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19 | import java.util.HashSet; |
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20 | import java.util.Set; |
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21 | import java.util.logging.Level; |
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22 | |
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23 | import javax.xml.bind.JAXBContext; |
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24 | import javax.xml.bind.JAXBException; |
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25 | import javax.xml.bind.Marshaller; |
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26 | |
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27 | import org.eclipse.jetty.client.HttpClient; |
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28 | import org.eclipse.jetty.client.api.Request; |
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29 | import org.eclipse.jetty.client.api.Response.CompleteListener; |
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30 | import org.eclipse.jetty.client.api.Result; |
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31 | import org.eclipse.jetty.client.util.OutputStreamContentProvider; |
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32 | import org.eclipse.jetty.http.HttpMethod; |
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33 | import org.eclipse.jetty.http.HttpVersion; |
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34 | import org.eclipse.jetty.util.thread.QueuedThreadPool; |
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35 | |
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36 | import de.ugoe.cs.autoquest.httpmonitor.HttpMonitor; |
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37 | import de.ugoe.cs.autoquest.httpmonitor.HttpMonitorComponent; |
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38 | import de.ugoe.cs.autoquest.httpmonitor.HttpMonitorException; |
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39 | import de.ugoe.cs.autoquest.httpmonitor.HttpMonitorExchangeHandler; |
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40 | import de.ugoe.cs.autoquest.httpmonitor.exchange.HttpExchange; |
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41 | import de.ugoe.cs.autoquest.httpmonitor.exchange.ObjectFactory; |
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42 | import de.ugoe.cs.util.console.Console; |
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43 | |
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44 | /** |
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45 | * <p> |
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46 | * If the exchanges recorded by the proxy are to be transmitted to a central {@link HttpMonitor}, |
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47 | * this exchanges handler is used. It is called by the exchange listener on completion of a proxied |
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48 | * request/response. It then creates an HTTP request to the central monitor and sends it there. |
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49 | * It is initialized with the name of the server and the port on which the central monitor runs. |
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50 | * If the exchanges can not be forwarded to the central server, they are discarded. |
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51 | * </p> |
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52 | * |
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53 | * @author Patrick Harms |
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54 | */ |
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55 | public class HttpMonitorRemoteExchangeHandler |
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56 | implements CompleteListener, HttpMonitorExchangeHandler, HttpMonitorComponent |
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57 | { |
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58 | |
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59 | /** |
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60 | * <p> |
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61 | * the HTTP client used internally to send data to the central server |
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62 | * </p> |
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63 | */ |
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64 | private HttpClient httpClient; |
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65 | |
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66 | /** |
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67 | * <p> |
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68 | * the host name of the central server |
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69 | * </p> |
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70 | */ |
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71 | private String httpMonitorServer; |
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72 | |
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73 | /** |
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74 | * <p> |
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75 | * the port of the central server |
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76 | * </p> |
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77 | */ |
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78 | private int httpMonitorPort; |
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79 | |
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80 | /** |
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81 | * <p> |
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82 | * a set of requests send to the central server for which the response was not received yet |
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83 | * </p> |
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84 | */ |
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85 | private Set<Request> openRequests = new HashSet<Request>(); |
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86 | |
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87 | /** |
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88 | * <p> |
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89 | * initializes the exchange handler with the host and port of the central server |
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90 | * </p> |
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91 | * |
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92 | * @param httpMonitorServer the host name of the central server |
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93 | * @param httpMonitorPort the port of the central server |
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94 | */ |
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95 | public HttpMonitorRemoteExchangeHandler(String httpMonitorServer, int httpMonitorPort) { |
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96 | this.httpMonitorServer = httpMonitorServer; |
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97 | this.httpMonitorPort = httpMonitorPort; |
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98 | } |
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99 | |
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100 | /* (non-Javadoc) |
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101 | * @see de.ugoe.cs.autoquest.httpmonitor.HttpMonitorComponent#init() |
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102 | */ |
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103 | @Override |
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104 | public void init() throws IllegalStateException, HttpMonitorException { |
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105 | httpClient = createHttpClient(); |
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106 | } |
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107 | |
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108 | /* (non-Javadoc) |
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109 | * @see de.ugoe.cs.autoquest.httpmonitor.HttpMonitorComponent#start() |
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110 | */ |
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111 | @Override |
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112 | public void start() throws IllegalStateException, HttpMonitorException { |
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113 | try { |
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114 | httpClient.start(); |
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115 | httpClient.getContentDecoderFactories().clear(); |
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116 | } |
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117 | catch (Exception e) { |
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118 | throw new HttpMonitorException("could not start client for HTTP-Monitor", e); |
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119 | } |
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120 | } |
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121 | |
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122 | /* (non-Javadoc) |
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123 | * @see de.ugoe.cs.autoquest.httpmonitor.HttpMonitorComponent#stop() |
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124 | */ |
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125 | @Override |
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126 | public void stop() { |
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127 | if (httpClient != null) { |
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128 | try { |
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129 | httpClient.stop(); |
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130 | } |
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131 | catch (Exception e) { |
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132 | Console.traceln(Level.WARNING, "could not stop client for HTTP-Monitor"); |
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133 | Console.logException(e); |
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134 | } |
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135 | } |
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136 | |
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137 | httpClient = null; |
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138 | } |
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139 | |
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140 | /* (non-Javadoc) |
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141 | * @see de.ugoe.cs.autoquest.httpmonitor.HttpMonitorExchangeHandler#handleHttpExchange() |
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142 | */ |
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143 | @Override |
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144 | public void handleHttpExchange(HttpExchange httpExchange) { |
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145 | // send the exchange to the server and wait for completion |
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146 | synchronized (openRequests) { |
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147 | Request httpMonitorRequest = httpClient.newRequest(httpMonitorServer, httpMonitorPort); |
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148 | httpMonitorRequest.method(HttpMethod.POST); |
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149 | httpMonitorRequest.version(HttpVersion.HTTP_1_1); |
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150 | |
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151 | OutputStreamContentProvider out = new OutputStreamContentProvider(); |
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152 | httpMonitorRequest.content(out); |
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153 | httpMonitorRequest.send(this); |
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154 | |
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155 | try { |
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156 | JAXBContext jaxbContext = |
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157 | JAXBContext.newInstance(HttpExchange.class.getPackage().getName()); |
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158 | Marshaller marshaller = jaxbContext.createMarshaller(); |
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159 | |
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160 | OutputStreamWriter writer = new OutputStreamWriter(out.getOutputStream(), "UTF-8"); |
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161 | marshaller.marshal(new ObjectFactory().createHttpExchange(httpExchange), writer); |
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162 | |
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163 | out.getOutputStream().close(); |
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164 | } |
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165 | catch (JAXBException e) { |
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166 | Console.printerrln("could not convert request and response to XML string: " + e); |
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167 | Console.logException(e); |
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168 | } |
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169 | catch (IOException e) { |
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170 | Console.printerrln |
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171 | ("could not close the stream for sending data to the HTML monitor: " + e); |
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172 | Console.logException(e); |
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173 | } |
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174 | |
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175 | openRequests.add(httpMonitorRequest); |
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176 | |
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177 | try { |
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178 | // wait for the request to be removed fromt the list asynchronously |
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179 | while (openRequests.contains(httpMonitorRequest)) { |
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180 | openRequests.wait(); |
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181 | } |
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182 | } |
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183 | catch (InterruptedException e) { |
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184 | // ignore, as this may only happen on system shutdown |
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185 | } |
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186 | } |
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187 | } |
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188 | |
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189 | /* (non-Javadoc) |
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190 | * @see org.eclipse.jetty.client.api.Response.CompleteListener#onComplete(Result) |
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191 | */ |
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192 | @Override |
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193 | public void onComplete(Result result) { |
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194 | if (result.isFailed()) { |
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195 | Console.traceln |
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196 | (Level.WARNING, "could not log exchange correctly: " + result.getFailure()); |
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197 | Console.logException((Exception) result.getFailure()); |
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198 | } |
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199 | |
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200 | synchronized (openRequests) { |
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201 | openRequests.remove(result.getRequest()); |
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202 | openRequests.notify(); |
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203 | } |
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204 | } |
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205 | |
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206 | /** |
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207 | * <p> |
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208 | * convenience method to create an initialize the utilized HTTP client |
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209 | * </p> |
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210 | */ |
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211 | private HttpClient createHttpClient() { |
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212 | HttpClient client = new HttpClient(); |
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213 | |
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214 | QueuedThreadPool executor = new QueuedThreadPool(10); |
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215 | executor.setName("HttpMonitorClients"); |
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216 | client.setExecutor(executor); |
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217 | |
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218 | client.setMaxConnectionsPerDestination(10000); |
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219 | client.setIdleTimeout(30000); |
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220 | client.setConnectTimeout(30000); |
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221 | client.setStopTimeout(30000); |
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222 | client.setRequestBufferSize(1024*1024); |
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223 | client.setResponseBufferSize(1024*1024); |
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224 | |
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225 | return client; |
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226 | } |
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227 | } |
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