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<h1>Process.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_PROCESS_H_</span>
<a name="l00026"></a>00026 <span class="preprocessor"></span><span class="preprocessor">#define _PASSENGER_PROCESS_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 <boost/function.hpp></span>
<a name="l00030"></a>00030 <span class="preprocessor">#include <oxt/system_calls.hpp></span>
<a name="l00031"></a>00031 <span class="preprocessor">#include <oxt/backtrace.hpp></span>
<a name="l00032"></a>00032 <span class="preprocessor">#include <string></span>
<a name="l00033"></a>00033 <span class="preprocessor">#include <map></span>
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="preprocessor">#include <sys/types.h></span>
<a name="l00036"></a>00036 <span class="preprocessor">#include <unistd.h></span>
<a name="l00037"></a>00037 <span class="preprocessor">#include <errno.h></span>
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="preprocessor">#include "Session.h"</span>
<a name="l00040"></a>00040 <span class="preprocessor">#include "MessageChannel.h"</span>
<a name="l00041"></a>00041 <span class="preprocessor">#include "Exceptions.h"</span>
<a name="l00042"></a>00042 <span class="preprocessor">#include "Logging.h"</span>
<a name="l00043"></a>00043 <span class="preprocessor">#include "Utils.h"</span>
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="keyword">namespace </span>Passenger {
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="keyword">using namespace </span>std;
<a name="l00048"></a>00048 <span class="keyword">using namespace </span>boost;
<a name="l00049"></a>00049 <span class="comment"></span>
<a name="l00050"></a>00050 <span class="comment">/**</span>
<a name="l00051"></a>00051 <span class="comment"> * Represents a single application process, as spawned by SpawnManager</span>
<a name="l00052"></a>00052 <span class="comment"> * or by ApplicationPool::Interface::get().</span>
<a name="l00053"></a>00053 <span class="comment"> *</span>
<a name="l00054"></a>00054 <span class="comment"> * @ingroup Support</span>
<a name="l00055"></a>00055 <span class="comment"> */</span>
<a name="l00056"></a><a class="code" href="classPassenger_1_1Process.html">00056</a> <span class="keyword">class </span><a class="code" href="classPassenger_1_1Process.html" title="Represents a single application process, as spawned by SpawnManager or by ApplicationPool::Interface...">Process</a> {
<a name="l00057"></a>00057 <span class="keyword">public</span>:
<a name="l00058"></a>00058 <span class="keyword">struct </span>SocketInfo {
<a name="l00059"></a>00059 <span class="keywordtype">string</span> address;
<a name="l00060"></a>00060 <span class="keywordtype">string</span> type;
<a name="l00061"></a>00061
<a name="l00062"></a>00062 SocketInfo() {}
<a name="l00063"></a>00063
<a name="l00064"></a>00064 SocketInfo(<span class="keyword">const</span> <span class="keywordtype">string</span> &address, <span class="keyword">const</span> <span class="keywordtype">string</span> &type) {
<a name="l00065"></a>00065 this->address = address;
<a name="l00066"></a>00066 this->type = type;
<a name="l00067"></a>00067 }
<a name="l00068"></a>00068 };
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="keyword">typedef</span> map<string, SocketInfo> SocketInfoMap;
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keyword">private</span>:
<a name="l00073"></a>00073 <span class="keywordtype">string</span> appRoot;
<a name="l00074"></a>00074 pid_t pid;
<a name="l00075"></a>00075 <span class="keywordtype">int</span> ownerPipe;
<a name="l00076"></a>00076 <span class="keywordtype">string</span> detachKey;
<a name="l00077"></a>00077 <span class="keywordtype">string</span> connectPassword;
<a name="l00078"></a>00078 SocketInfoMap serverSockets;
<a name="l00079"></a>00079 SocketInfo *mainServerSocket;
<a name="l00080"></a>00080 function<void ()> destructionCallback;
<a name="l00081"></a>00081
<a name="l00082"></a>00082 <span class="keyword">public</span>:<span class="comment"></span>
<a name="l00083"></a>00083 <span class="comment"> /**</span>
<a name="l00084"></a>00084 <span class="comment"> * Construct a new Process object.</span>
<a name="l00085"></a>00085 <span class="comment"> *</span>
<a name="l00086"></a>00086 <span class="comment"> * @param appRoot The application root of an application.</span>
<a name="l00087"></a>00087 <span class="comment"> * This must be a valid directory, but the path does not have to be absolute.</span>
<a name="l00088"></a>00088 <span class="comment"> * @param pid The process ID of this application process.</span>
<a name="l00089"></a>00089 <span class="comment"> * @param ownerPipe The owner pipe of this application process.</span>
<a name="l00090"></a>00090 <span class="comment"> * @param serverSockets All the server sockets that this process listens on.</span>
<a name="l00091"></a>00091 <span class="comment"> * There must a server socket with the name 'main'.</span>
<a name="l00092"></a>00092 <span class="comment"> * @param detachKey A detach key. Used by the ApplicationPool algorithm.</span>
<a name="l00093"></a>00093 <span class="comment"> * @param connectPassword The password to use when connecting to this process.</span>
<a name="l00094"></a>00094 <span class="comment"> * Must be valid ASCII.</span>
<a name="l00095"></a>00095 <span class="comment"> * @param destructionCallback A callback to be called when this Process is destroyed.</span>
<a name="l00096"></a>00096 <span class="comment"> * @throws ArgumentException If serverSockets has no socket named 'main'.</span>
<a name="l00097"></a>00097 <span class="comment"> */</span>
<a name="l00098"></a><a class="code" href="classPassenger_1_1Process.html#cbc73466ae557c68cf040fcce925096c">00098</a> <a class="code" href="classPassenger_1_1Process.html#cbc73466ae557c68cf040fcce925096c" title="Construct a new Process object.">Process</a>(<span class="keyword">const</span> <span class="keywordtype">string</span> &appRoot, pid_t pid, <span class="keywordtype">int</span> ownerPipe, <span class="keyword">const</span> SocketInfoMap &serverSockets,
<a name="l00099"></a>00099 <span class="keyword">const</span> <span class="keywordtype">string</span> &detachKey, <span class="keyword">const</span> <span class="keywordtype">string</span> &connectPassword,
<a name="l00100"></a>00100 <span class="keyword">const</span> function<<span class="keywordtype">void</span> ()> &destructionCallback = function<<span class="keywordtype">void</span> ()>())
<a name="l00101"></a>00101 {
<a name="l00102"></a>00102 this->appRoot = appRoot;
<a name="l00103"></a>00103 this->pid = pid;
<a name="l00104"></a>00104 this->ownerPipe = ownerPipe;
<a name="l00105"></a>00105 this->serverSockets = serverSockets;
<a name="l00106"></a>00106 this->detachKey = detachKey;
<a name="l00107"></a>00107 this->connectPassword = connectPassword;
<a name="l00108"></a>00108 this->destructionCallback = destructionCallback;
<a name="l00109"></a>00109 <span class="keywordflow">if</span> (serverSockets.find(<span class="stringliteral">"main"</span>) == serverSockets.end()) {
<a name="l00110"></a>00110 TRACE_POINT();
<a name="l00111"></a>00111 <span class="keywordflow">throw</span> <a class="code" href="classPassenger_1_1ArgumentException.html" title="Indicates that a specified argument is incorrect or violates a requirement.">ArgumentException</a>(<span class="stringliteral">"There must be a server socket named 'main'."</span>);
<a name="l00112"></a>00112 }
<a name="l00113"></a>00113 mainServerSocket = &this->serverSockets[<span class="stringliteral">"main"</span>];
<a name="l00114"></a>00114 P_TRACE(3, <span class="stringliteral">"Application process "</span> << <span class="keyword">this</span> << <span class="stringliteral">": created."</span>);
<a name="l00115"></a>00115 }
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <span class="keyword">virtual</span> ~<a class="code" href="classPassenger_1_1Process.html" title="Represents a single application process, as spawned by SpawnManager or by ApplicationPool::Interface...">Process</a>() {
<a name="l00118"></a>00118 TRACE_POINT();
<a name="l00119"></a>00119 SocketInfoMap::const_iterator it;
<a name="l00120"></a>00120 <span class="keywordtype">int</span> ret;
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="keywordflow">if</span> (ownerPipe != -1) {
<a name="l00123"></a>00123 <span class="keywordflow">do</span> {
<a name="l00124"></a>00124 ret = close(ownerPipe);
<a name="l00125"></a>00125 } <span class="keywordflow">while</span> (ret == -1 && errno == EINTR);
<a name="l00126"></a>00126 }
<a name="l00127"></a>00127 <span class="keywordflow">for</span> (it = serverSockets.begin(); it != serverSockets.end(); it++) {
<a name="l00128"></a>00128 <span class="keyword">const</span> SocketInfo &info = it->second;
<a name="l00129"></a>00129 <span class="keywordflow">if</span> (info.type == <span class="stringliteral">"unix"</span>) {
<a name="l00130"></a>00130 <span class="keywordflow">do</span> {
<a name="l00131"></a>00131 ret = unlink(info.address.c_str());
<a name="l00132"></a>00132 } <span class="keywordflow">while</span> (ret == -1 && errno == EINTR);
<a name="l00133"></a>00133 }
<a name="l00134"></a>00134 }
<a name="l00135"></a>00135 P_TRACE(3, <span class="stringliteral">"Application process "</span> << <span class="keyword">this</span> << <span class="stringliteral">": destroyed."</span>);
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="keywordflow">if</span> (destructionCallback) {
<a name="l00138"></a>00138 destructionCallback();
<a name="l00139"></a>00139 }
<a name="l00140"></a>00140 }
<a name="l00141"></a>00141 <span class="comment"></span>
<a name="l00142"></a>00142 <span class="comment"> /**</span>
<a name="l00143"></a>00143 <span class="comment"> * Returns the application root for this application process. See</span>
<a name="l00144"></a>00144 <span class="comment"> * the constructor for information about the application root.</span>
<a name="l00145"></a>00145 <span class="comment"> */</span>
<a name="l00146"></a><a class="code" href="classPassenger_1_1Process.html#ce9e949fa460ce09228cc08d76fc38e7">00146</a> <span class="keywordtype">string</span> <a class="code" href="classPassenger_1_1Process.html#ce9e949fa460ce09228cc08d76fc38e7" title="Returns the application root for this application process.">getAppRoot</a>()<span class="keyword"> const </span>{
<a name="l00147"></a>00147 <span class="keywordflow">return</span> appRoot;
<a name="l00148"></a>00148 }
<a name="l00149"></a>00149 <span class="comment"></span>
<a name="l00150"></a>00150 <span class="comment"> /**</span>
<a name="l00151"></a>00151 <span class="comment"> * Returns the process ID of this application process.</span>
<a name="l00152"></a>00152 <span class="comment"> */</span>
<a name="l00153"></a><a class="code" href="classPassenger_1_1Process.html#fc1b82c05e963fee7e58445b152ca784">00153</a> pid_t <a class="code" href="classPassenger_1_1Process.html#fc1b82c05e963fee7e58445b152ca784" title="Returns the process ID of this application process.">getPid</a>()<span class="keyword"> const </span>{
<a name="l00154"></a>00154 <span class="keywordflow">return</span> pid;
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156 <span class="comment"></span>
<a name="l00157"></a>00157 <span class="comment"> /**</span>
<a name="l00158"></a>00158 <span class="comment"> * Returns this process's detach key.</span>
<a name="l00159"></a>00159 <span class="comment"> */</span>
<a name="l00160"></a><a class="code" href="classPassenger_1_1Process.html#308fa4c3bf80e4d3d48a3c833b9e3205">00160</a> <span class="keywordtype">string</span> <a class="code" href="classPassenger_1_1Process.html#308fa4c3bf80e4d3d48a3c833b9e3205" title="Returns this process&#39;s detach key.">getDetachKey</a>()<span class="keyword"> const </span>{
<a name="l00161"></a>00161 <span class="keywordflow">return</span> detachKey;
<a name="l00162"></a>00162 }
<a name="l00163"></a>00163 <span class="comment"></span>
<a name="l00164"></a>00164 <span class="comment"> /**</span>
<a name="l00165"></a>00165 <span class="comment"> * Returns this process's connect password. This password is</span>
<a name="l00166"></a>00166 <span class="comment"> * guaranteed to be valid ASCII.</span>
<a name="l00167"></a>00167 <span class="comment"> */</span>
<a name="l00168"></a><a class="code" href="classPassenger_1_1Process.html#002791d7909d4d7a6566eb26ec491552">00168</a> <span class="keywordtype">string</span> <a class="code" href="classPassenger_1_1Process.html#002791d7909d4d7a6566eb26ec491552" title="Returns this process&#39;s connect password.">getConnectPassword</a>()<span class="keyword"> const </span>{
<a name="l00169"></a>00169 <span class="keywordflow">return</span> connectPassword;
<a name="l00170"></a>00170 }
<a name="l00171"></a>00171 <span class="comment"></span>
<a name="l00172"></a>00172 <span class="comment"> /**</span>
<a name="l00173"></a>00173 <span class="comment"> * Returns a map containing all server sockets that this process</span>
<a name="l00174"></a>00174 <span class="comment"> * listens on.</span>
<a name="l00175"></a>00175 <span class="comment"> */</span>
<a name="l00176"></a><a class="code" href="classPassenger_1_1Process.html#fe06f5be540203452a5e787da15ee5e4">00176</a> <span class="keyword">const</span> SocketInfoMap *<a class="code" href="classPassenger_1_1Process.html#fe06f5be540203452a5e787da15ee5e4" title="Returns a map containing all server sockets that this process listens on.">getServerSockets</a>()<span class="keyword"> const </span>{
<a name="l00177"></a>00177 <span class="keywordflow">return</span> &serverSockets;
<a name="l00178"></a>00178 }
<a name="l00179"></a>00179 <span class="comment"></span>
<a name="l00180"></a>00180 <span class="comment"> /**</span>
<a name="l00181"></a>00181 <span class="comment"> * Request a new session from this application process by connecting to its</span>
<a name="l00182"></a>00182 <span class="comment"> * main server socket. This session represents the life time of a single</span>
<a name="l00183"></a>00183 <span class="comment"> * request/response pair, and can be used to send the request data to the</span>
<a name="l00184"></a>00184 <span class="comment"> * application process, as well as receiving the response data.</span>
<a name="l00185"></a>00185 <span class="comment"> *</span>
<a name="l00186"></a>00186 <span class="comment"> * The use of connect() is demonstrated in the following example.</span>
<a name="l00187"></a>00187 <span class="comment"> * @code</span>
<a name="l00188"></a>00188 <span class="comment"> * // Request a new session from the process.</span>
<a name="l00189"></a>00189 <span class="comment"> * SessionPtr session = process->newSession(...);</span>
<a name="l00190"></a>00190 <span class="comment"> * </span>
<a name="l00191"></a>00191 <span class="comment"> * // Send the request headers and request body data.</span>
<a name="l00192"></a>00192 <span class="comment"> * session->sendHeaders(...);</span>
<a name="l00193"></a>00193 <span class="comment"> * session->sendBodyBlock(...);</span>
<a name="l00194"></a>00194 <span class="comment"> * // Done sending data, so we close the writer channel.</span>
<a name="l00195"></a>00195 <span class="comment"> * session->shutdownWriter();</span>
<a name="l00196"></a>00196 <span class="comment"> *</span>
<a name="l00197"></a>00197 <span class="comment"> * // Now read the HTTP response.</span>
<a name="l00198"></a>00198 <span class="comment"> * string responseData = readAllDataFromSocket(session->getReader());</span>
<a name="l00199"></a>00199 <span class="comment"> * // Done reading data, so we close the reader channel.</span>
<a name="l00200"></a>00200 <span class="comment"> * session->shutdownReader();</span>
<a name="l00201"></a>00201 <span class="comment"> *</span>
<a name="l00202"></a>00202 <span class="comment"> * // This session has now finished, so we close the session by resetting</span>
<a name="l00203"></a>00203 <span class="comment"> * // the smart pointer to NULL (thereby destroying the Session object).</span>
<a name="l00204"></a>00204 <span class="comment"> * session.reset();</span>
<a name="l00205"></a>00205 <span class="comment"> *</span>
<a name="l00206"></a>00206 <span class="comment"> * // We can connect to a Process multiple times. Just make sure</span>
<a name="l00207"></a>00207 <span class="comment"> * // the previous session is closed.</span>
<a name="l00208"></a>00208 <span class="comment"> * session = process->newSession(...);</span>
<a name="l00209"></a>00209 <span class="comment"> * @endcode</span>
<a name="l00210"></a>00210 <span class="comment"> *</span>
<a name="l00211"></a>00211 <span class="comment"> * You <b>must</b> close a session when you no longer need it. If you</span>
<a name="l00212"></a>00212 <span class="comment"> * call connect() without having properly closed a previous session,</span>
<a name="l00213"></a>00213 <span class="comment"> * you might cause a deadlock because the application process may be</span>
<a name="l00214"></a>00214 <span class="comment"> * waiting for you to close the previous session.</span>
<a name="l00215"></a>00215 <span class="comment"> *</span>
<a name="l00216"></a>00216 <span class="comment"> * @param closeCallback A function which will be called when the session has been closed.</span>
<a name="l00217"></a>00217 <span class="comment"> * @param initiateNow Whether the session should be initiated immediately.</span>
<a name="l00218"></a>00218 <span class="comment"> * If set to false then you must call <tt>initiate()</tt> on</span>
<a name="l00219"></a>00219 <span class="comment"> * the session before it's usable.</span>
<a name="l00220"></a>00220 <span class="comment"> * @return A smart pointer to a Session object, which represents the created session.</span>
<a name="l00221"></a>00221 <span class="comment"> * @post result->initiated() == initiateNow</span>
<a name="l00222"></a>00222 <span class="comment"> * @throws SystemException Something went wrong during session initiation.</span>
<a name="l00223"></a>00223 <span class="comment"> * @throws IOException Something went wrong during session initiation.</span>
<a name="l00224"></a>00224 <span class="comment"> * @throws boost::thread_interrupted</span>
<a name="l00225"></a>00225 <span class="comment"> */</span>
<a name="l00226"></a><a class="code" href="classPassenger_1_1Process.html#a5bd9ad8220bf64e5edf3d025004547a">00226</a> SessionPtr <a class="code" href="classPassenger_1_1Process.html#a5bd9ad8220bf64e5edf3d025004547a" title="Request a new session from this application process by connecting to its main server...">newSession</a>(<span class="keyword">const</span> function<<span class="keywordtype">void</span>()> &closeCallback = function<<span class="keywordtype">void</span>()>(),
<a name="l00227"></a>00227 <span class="keywordtype">bool</span> initiateNow = <span class="keyword">true</span>)
<a name="l00228"></a>00228 {
<a name="l00229"></a>00229 SessionPtr session(<span class="keyword">new</span> <a class="code" href="classPassenger_1_1StandardSession.html" title="A &quot;standard&quot; implementation of Session.">StandardSession</a>(pid, closeCallback,
<a name="l00230"></a>00230 mainServerSocket->type, mainServerSocket->address,
<a name="l00231"></a>00231 detachKey, connectPassword));
<a name="l00232"></a>00232 <span class="keywordflow">if</span> (initiateNow) {
<a name="l00233"></a>00233 session->initiate();
<a name="l00234"></a>00234 }
<a name="l00235"></a>00235 <span class="keywordflow">return</span> session;
<a name="l00236"></a>00236 }
<a name="l00237"></a>00237 };
<a name="l00238"></a>00238 <span class="comment"></span>
<a name="l00239"></a>00239 <span class="comment">/** Convenient alias for Process smart pointer. */</span>
<a name="l00240"></a><a class="code" href="namespacePassenger.html#ced1f248465136b313c6dec5fe6ca492">00240</a> <span class="keyword">typedef</span> shared_ptr<Process> <a class="code" href="namespacePassenger.html#ced1f248465136b313c6dec5fe6ca492" title="Convenient alias for Process smart pointer.">ProcessPtr</a>;
<a name="l00241"></a>00241
<a name="l00242"></a>00242 } <span class="comment">// namespace Passenger</span>
<a name="l00243"></a>00243
<a name="l00244"></a>00244 <span class="preprocessor">#endif </span><span class="comment">/* _PASSENGER_PROCESS_H_ */</span>
</pre></div></div>
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