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<h1>MessageClient.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Phusion Passenger - http://www.modrails.com/</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright (c) 2010 Phusion</span>
<a name="l00004"></a>00004 <span class="comment"> *</span>
<a name="l00005"></a>00005 <span class="comment"> * "Phusion Passenger" is a trademark of Hongli Lai & Ninh Bui.</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a copy</span>
<a name="l00008"></a>00008 <span class="comment"> * of this software and associated documentation files (the "Software"), to deal</span>
<a name="l00009"></a>00009 <span class="comment"> * in the Software without restriction, including without limitation the rights</span>
<a name="l00010"></a>00010 <span class="comment"> * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span>
<a name="l00011"></a>00011 <span class="comment"> * copies of the Software, and to permit persons to whom the Software is</span>
<a name="l00012"></a>00012 <span class="comment"> * furnished to do so, subject to the following conditions:</span>
<a name="l00013"></a>00013 <span class="comment"> *</span>
<a name="l00014"></a>00014 <span class="comment"> * The above copyright notice and this permission notice shall be included in</span>
<a name="l00015"></a>00015 <span class="comment"> * all copies or substantial portions of the Software.</span>
<a name="l00016"></a>00016 <span class="comment"> *</span>
<a name="l00017"></a>00017 <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span>
<a name="l00018"></a>00018 <span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span>
<a name="l00019"></a>00019 <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span>
<a name="l00020"></a>00020 <span class="comment"> * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span>
<a name="l00021"></a>00021 <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span>
<a name="l00022"></a>00022 <span class="comment"> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN</span>
<a name="l00023"></a>00023 <span class="comment"> * THE SOFTWARE.</span>
<a name="l00024"></a>00024 <span class="comment"> */</span>
<a name="l00025"></a>00025 <span class="preprocessor">#ifndef _PASSENGER_MESSAGE_CLIENT_H_</span>
<a name="l00026"></a>00026 <span class="preprocessor"></span><span class="preprocessor">#define _PASSENGER_MESSAGE_CLIENT_H_</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span>
<a name="l00028"></a>00028 <span class="preprocessor">#include <boost/shared_ptr.hpp></span>
<a name="l00029"></a>00029 <span class="preprocessor">#include <string></span>
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="preprocessor">#include "StaticString.h"</span>
<a name="l00032"></a>00032 <span class="preprocessor">#include "MessageChannel.h"</span>
<a name="l00033"></a>00033 <span class="preprocessor">#include "Exceptions.h"</span>
<a name="l00034"></a>00034 <span class="preprocessor">#include "Utils.h"</span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036
<a name="l00037"></a>00037 <span class="keyword">namespace </span>Passenger {
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="keyword">using namespace </span>std;
<a name="l00040"></a>00040 <span class="keyword">using namespace </span>boost;
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="keyword">class </span>MessageClient {
<a name="l00043"></a>00043 <span class="keyword">protected</span>:
<a name="l00044"></a>00044 FileDescriptor fd;
<a name="l00045"></a>00045 MessageChannel channel;
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="comment">/* sendUsername() and sendPassword() exist and are virtual in order to facilitate unit testing. */</span>
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <span class="keyword">virtual</span> <span class="keywordtype">void</span> sendUsername(MessageChannel &channel, <span class="keyword">const</span> <span class="keywordtype">string</span> &username) {
<a name="l00050"></a>00050 channel.writeScalar(username);
<a name="l00051"></a>00051 }
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <span class="keyword">virtual</span> <span class="keywordtype">void</span> sendPassword(MessageChannel &channel, <span class="keyword">const</span> StaticString &userSuppliedPassword) {
<a name="l00054"></a>00054 channel.writeScalar(userSuppliedPassword.c_str(), userSuppliedPassword.size());
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056 <span class="comment"></span>
<a name="l00057"></a>00057 <span class="comment"> /**</span>
<a name="l00058"></a>00058 <span class="comment"> * Authenticate to the server with the given username and password.</span>
<a name="l00059"></a>00059 <span class="comment"> *</span>
<a name="l00060"></a>00060 <span class="comment"> * @throws SystemException An error occurred while reading data from or sending data to the server.</span>
<a name="l00061"></a>00061 <span class="comment"> * @throws IOException An error occurred while reading data from or sending data to the server.</span>
<a name="l00062"></a>00062 <span class="comment"> * @throws SecurityException The server denied authentication.</span>
<a name="l00063"></a>00063 <span class="comment"> * @throws boost::thread_interrupted</span>
<a name="l00064"></a>00064 <span class="comment"> * @pre <tt>channel</tt> is connected.</span>
<a name="l00065"></a>00065 <span class="comment"> */</span>
<a name="l00066"></a>00066 <span class="keywordtype">void</span> authenticate(<span class="keyword">const</span> <span class="keywordtype">string</span> &username, <span class="keyword">const</span> StaticString &userSuppliedPassword) {
<a name="l00067"></a>00067 vector<string> args;
<a name="l00068"></a>00068
<a name="l00069"></a>00069 sendUsername(channel, username);
<a name="l00070"></a>00070 sendPassword(channel, userSuppliedPassword);
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keywordflow">if</span> (!channel.read(args)) {
<a name="l00073"></a>00073 <span class="keywordflow">throw</span> IOException(<span class="stringliteral">"The ApplicationPool server did not send an authentication response."</span>);
<a name="l00074"></a>00074 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (args.size() != 1) {
<a name="l00075"></a>00075 <span class="keywordflow">throw</span> IOException(<span class="stringliteral">"The authentication response that the ApplicationPool server sent is not valid."</span>);
<a name="l00076"></a>00076 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (args[0] != <span class="stringliteral">"ok"</span>) {
<a name="l00077"></a>00077 <span class="keywordflow">throw</span> SecurityException(<span class="stringliteral">"The ApplicationPool server denied authentication: "</span> + args[0]);
<a name="l00078"></a>00078 }
<a name="l00079"></a>00079 }
<a name="l00080"></a>00080 <span class="comment"></span>
<a name="l00081"></a>00081 <span class="comment"> /** Closes the connection without throwing close exceptions. */</span>
<a name="l00082"></a>00082 <span class="keywordtype">void</span> silentDisconnect() {
<a name="l00083"></a>00083 fd = FileDescriptor();
<a name="l00084"></a>00084 channel = MessageChannel();
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086
<a name="l00087"></a>00087 <span class="keyword">public</span>:<span class="comment"></span>
<a name="l00088"></a>00088 <span class="comment"> /**</span>
<a name="l00089"></a>00089 <span class="comment"> * Create a new MessageClient object. It doesn't actually connect to the server until</span>
<a name="l00090"></a>00090 <span class="comment"> * you call connect().</span>
<a name="l00091"></a>00091 <span class="comment"> */</span>
<a name="l00092"></a>00092 MessageClient() {
<a name="l00093"></a>00093 <span class="comment">/* The reason why we don't connect right away is because we want to make</span>
<a name="l00094"></a>00094 <span class="comment"> * certain methods virtual for unit testing purposes. We can't call</span>
<a name="l00095"></a>00095 <span class="comment"> * virtual methods in the constructor. :-(</span>
<a name="l00096"></a>00096 <span class="comment"> */</span>
<a name="l00097"></a>00097 }
<a name="l00098"></a>00098
<a name="l00099"></a>00099 <span class="keyword">virtual</span> ~MessageClient() { }
<a name="l00100"></a>00100 <span class="comment"></span>
<a name="l00101"></a>00101 <span class="comment"> /**</span>
<a name="l00102"></a>00102 <span class="comment"> * Connect to the given MessageServer. If a connection was already established,</span>
<a name="l00103"></a>00103 <span class="comment"> * then the old connection will be closed and a new connection will be established.</span>
<a name="l00104"></a>00104 <span class="comment"> *</span>
<a name="l00105"></a>00105 <span class="comment"> * If this MessageClient was in a connected state, and this method throws an exception,</span>
<a name="l00106"></a>00106 <span class="comment"> * then old connection will be broken.</span>
<a name="l00107"></a>00107 <span class="comment"> *</span>
<a name="l00108"></a>00108 <span class="comment"> * @param socketFilename The filename of the server socket to connect to.</span>
<a name="l00109"></a>00109 <span class="comment"> * @param username The username to use for authenticating with the server.</span>
<a name="l00110"></a>00110 <span class="comment"> * @param userSuppliedPassword The password to use for authenticating with the server.</span>
<a name="l00111"></a>00111 <span class="comment"> * @return this</span>
<a name="l00112"></a>00112 <span class="comment"> * @throws SystemException Something went wrong while connecting to the server.</span>
<a name="l00113"></a>00113 <span class="comment"> * @throws IOException Something went wrong while connecting to the server.</span>
<a name="l00114"></a>00114 <span class="comment"> * @throws RuntimeException Something went wrong.</span>
<a name="l00115"></a>00115 <span class="comment"> * @throws SecurityException Unable to authenticate to the server with the given username and password.</span>
<a name="l00116"></a>00116 <span class="comment"> * You may call connect() again with a different username/password.</span>
<a name="l00117"></a>00117 <span class="comment"> * @throws boost::thread_interrupted</span>
<a name="l00118"></a>00118 <span class="comment"> * @post connected()</span>
<a name="l00119"></a>00119 <span class="comment"> */</span>
<a name="l00120"></a>00120 MessageClient *connect(<span class="keyword">const</span> <span class="keywordtype">string</span> &socketFilename, <span class="keyword">const</span> <span class="keywordtype">string</span> &username, <span class="keyword">const</span> StaticString &userSuppliedPassword) {
<a name="l00121"></a>00121 <span class="keywordflow">try</span> {
<a name="l00122"></a>00122 fd = <a class="code" href="group__Support.html#gae3993db9dfa0b05c97b67ccefd2b619" title="Connect to a Unix server socket at filename.">connectToUnixServer</a>(socketFilename.c_str());
<a name="l00123"></a>00123 channel = MessageChannel(fd);
<a name="l00124"></a>00124 authenticate(username, userSuppliedPassword);
<a name="l00125"></a>00125 <span class="keywordflow">return</span> <span class="keyword">this</span>;
<a name="l00126"></a>00126 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> RuntimeException &) {
<a name="l00127"></a>00127 silentDisconnect();
<a name="l00128"></a>00128 <span class="keywordflow">throw</span>;
<a name="l00129"></a>00129 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> SystemException &) {
<a name="l00130"></a>00130 silentDisconnect();
<a name="l00131"></a>00131 <span class="keywordflow">throw</span>;
<a name="l00132"></a>00132 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> IOException &) {
<a name="l00133"></a>00133 silentDisconnect();
<a name="l00134"></a>00134 <span class="keywordflow">throw</span>;
<a name="l00135"></a>00135 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> boost::thread_interrupted &) {
<a name="l00136"></a>00136 silentDisconnect();
<a name="l00137"></a>00137 <span class="keywordflow">throw</span>;
<a name="l00138"></a>00138 }
<a name="l00139"></a>00139 }
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="keywordtype">void</span> disconnect() {
<a name="l00142"></a>00142 <span class="keywordflow">if</span> (fd != -1) {
<a name="l00143"></a>00143 fd.close();
<a name="l00144"></a>00144 fd = FileDescriptor();
<a name="l00145"></a>00145 channel = MessageChannel();
<a name="l00146"></a>00146 }
<a name="l00147"></a>00147 }
<a name="l00148"></a>00148
<a name="l00149"></a>00149 <span class="keywordtype">bool</span> connected()<span class="keyword"> const </span>{
<a name="l00150"></a>00150 <span class="keywordflow">return</span> fd != -1;
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152 <span class="comment"></span>
<a name="l00153"></a>00153 <span class="comment"> /**</span>
<a name="l00154"></a>00154 <span class="comment"> * @throws SystemException</span>
<a name="l00155"></a>00155 <span class="comment"> * @throws boost::thread_interrupted</span>
<a name="l00156"></a>00156 <span class="comment"> */</span>
<a name="l00157"></a>00157 <span class="keywordtype">bool</span> read(vector<string> &args) {
<a name="l00158"></a>00158 <span class="keywordflow">try</span> {
<a name="l00159"></a>00159 <span class="keywordflow">return</span> channel.read(args);
<a name="l00160"></a>00160 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> SystemException &e) {
<a name="l00161"></a>00161 silentDisconnect();
<a name="l00162"></a>00162 <span class="keywordflow">throw</span>;
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165 <span class="comment"></span>
<a name="l00166"></a>00166 <span class="comment"> /**</span>
<a name="l00167"></a>00167 <span class="comment"> * @throws SystemException</span>
<a name="l00168"></a>00168 <span class="comment"> * @throws SecurityException</span>
<a name="l00169"></a>00169 <span class="comment"> * @throws TimeoutException</span>
<a name="l00170"></a>00170 <span class="comment"> * @throws boost::thread_interrupted</span>
<a name="l00171"></a>00171 <span class="comment"> */</span>
<a name="l00172"></a>00172 <span class="keywordtype">bool</span> readScalar(<span class="keywordtype">string</span> &output, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> maxSize = 0, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> *timeout = NULL) {
<a name="l00173"></a>00173 <span class="keywordflow">try</span> {
<a name="l00174"></a>00174 <span class="keywordflow">return</span> channel.readScalar(output, maxSize, timeout);
<a name="l00175"></a>00175 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> SystemException &) {
<a name="l00176"></a>00176 silentDisconnect();
<a name="l00177"></a>00177 <span class="keywordflow">throw</span>;
<a name="l00178"></a>00178 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> SecurityException &) {
<a name="l00179"></a>00179 silentDisconnect();
<a name="l00180"></a>00180 <span class="keywordflow">throw</span>;
<a name="l00181"></a>00181 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> TimeoutException &) {
<a name="l00182"></a>00182 silentDisconnect();
<a name="l00183"></a>00183 <span class="keywordflow">throw</span>;
<a name="l00184"></a>00184 }
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186 <span class="comment"></span>
<a name="l00187"></a>00187 <span class="comment"> /**</span>
<a name="l00188"></a>00188 <span class="comment"> * @throws SystemExeption</span>
<a name="l00189"></a>00189 <span class="comment"> * @throws IOException</span>
<a name="l00190"></a>00190 <span class="comment"> * @throws boost::thread_interrupted</span>
<a name="l00191"></a>00191 <span class="comment"> */</span>
<a name="l00192"></a>00192 <span class="keywordtype">int</span> readFileDescriptor(<span class="keywordtype">bool</span> negotiate = <span class="keyword">true</span>) {
<a name="l00193"></a>00193 <span class="keywordflow">try</span> {
<a name="l00194"></a>00194 <span class="keywordflow">return</span> channel.readFileDescriptor(negotiate);
<a name="l00195"></a>00195 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> SystemException &) {
<a name="l00196"></a>00196 silentDisconnect();
<a name="l00197"></a>00197 <span class="keywordflow">throw</span>;
<a name="l00198"></a>00198 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> IOException &) {
<a name="l00199"></a>00199 silentDisconnect();
<a name="l00200"></a>00200 <span class="keywordflow">throw</span>;
<a name="l00201"></a>00201 }
<a name="l00202"></a>00202 }
<a name="l00203"></a>00203 <span class="comment"></span>
<a name="l00204"></a>00204 <span class="comment"> /**</span>
<a name="l00205"></a>00205 <span class="comment"> * @throws SystemException</span>
<a name="l00206"></a>00206 <span class="comment"> * @throws boost::thread_interrupted</span>
<a name="l00207"></a>00207 <span class="comment"> */</span>
<a name="l00208"></a>00208 <span class="keywordtype">void</span> write(<span class="keyword">const</span> <span class="keywordtype">char</span> *name, ...) {
<a name="l00209"></a>00209 va_list ap;
<a name="l00210"></a>00210 va_start(ap, name);
<a name="l00211"></a>00211 <span class="keywordflow">try</span> {
<a name="l00212"></a>00212 <span class="keywordflow">try</span> {
<a name="l00213"></a>00213 channel.write(name, ap);
<a name="l00214"></a>00214 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> SystemException &) {
<a name="l00215"></a>00215 silentDisconnect();
<a name="l00216"></a>00216 <span class="keywordflow">throw</span>;
<a name="l00217"></a>00217 }
<a name="l00218"></a>00218 va_end(ap);
<a name="l00219"></a>00219 } <span class="keywordflow">catch</span> (...) {
<a name="l00220"></a>00220 va_end(ap);
<a name="l00221"></a>00221 <span class="keywordflow">throw</span>;
<a name="l00222"></a>00222 }
<a name="l00223"></a>00223 }
<a name="l00224"></a>00224 <span class="comment"></span>
<a name="l00225"></a>00225 <span class="comment"> /**</span>
<a name="l00226"></a>00226 <span class="comment"> * @throws SystemException</span>
<a name="l00227"></a>00227 <span class="comment"> * @throws boost::thread_interrupted</span>
<a name="l00228"></a>00228 <span class="comment"> */</span>
<a name="l00229"></a>00229 <span class="keywordtype">void</span> writeScalar(<span class="keyword">const</span> <span class="keywordtype">char</span> *data, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size) {
<a name="l00230"></a>00230 <span class="keywordflow">try</span> {
<a name="l00231"></a>00231 channel.writeScalar(data, size);
<a name="l00232"></a>00232 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> SystemException &) {
<a name="l00233"></a>00233 silentDisconnect();
<a name="l00234"></a>00234 <span class="keywordflow">throw</span>;
<a name="l00235"></a>00235 }
<a name="l00236"></a>00236 }
<a name="l00237"></a>00237 <span class="comment"></span>
<a name="l00238"></a>00238 <span class="comment"> /**</span>
<a name="l00239"></a>00239 <span class="comment"> * @throws SystemException</span>
<a name="l00240"></a>00240 <span class="comment"> * @throws boost::thread_interrupted</span>
<a name="l00241"></a>00241 <span class="comment"> */</span>
<a name="l00242"></a>00242 <span class="keywordtype">void</span> writeScalar(<span class="keyword">const</span> StaticString &data) {
<a name="l00243"></a>00243 <span class="keywordflow">try</span> {
<a name="l00244"></a>00244 channel.writeScalar(data.c_str(), data.size());
<a name="l00245"></a>00245 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> SystemException &) {
<a name="l00246"></a>00246 silentDisconnect();
<a name="l00247"></a>00247 <span class="keywordflow">throw</span>;
<a name="l00248"></a>00248 }
<a name="l00249"></a>00249 }
<a name="l00250"></a>00250 <span class="comment"></span>
<a name="l00251"></a>00251 <span class="comment"> /**</span>
<a name="l00252"></a>00252 <span class="comment"> * @throws SystemException</span>
<a name="l00253"></a>00253 <span class="comment"> * @throws boost::thread_interrupted</span>
<a name="l00254"></a>00254 <span class="comment"> */</span>
<a name="l00255"></a>00255 <span class="keywordtype">void</span> writeFileDescriptor(<span class="keywordtype">int</span> fileDescriptor, <span class="keywordtype">bool</span> negotiate = <span class="keyword">true</span>) {
<a name="l00256"></a>00256 <span class="keywordflow">try</span> {
<a name="l00257"></a>00257 channel.writeFileDescriptor(fileDescriptor, negotiate);
<a name="l00258"></a>00258 } <span class="keywordflow">catch</span> (<span class="keyword">const</span> SystemException &) {
<a name="l00259"></a>00259 silentDisconnect();
<a name="l00260"></a>00260 <span class="keywordflow">throw</span>;
<a name="l00261"></a>00261 }
<a name="l00262"></a>00262 }
<a name="l00263"></a>00263 };
<a name="l00264"></a>00264
<a name="l00265"></a>00265 <span class="keyword">typedef</span> shared_ptr<MessageClient> MessageClientPtr;
<a name="l00266"></a>00266
<a name="l00267"></a>00267 } <span class="comment">// namespace Passenger</span>
<a name="l00268"></a>00268
<a name="l00269"></a>00269 <span class="preprocessor">#endif </span><span class="comment">/* _PASSENGER_MESSAGE_CLIENT_H_ */</span>
</pre></div></div>
<hr size="1"><address style="text-align: right;"><small>Generated on Sun Feb 21 12:22:45 2010 for Passenger by
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