Mercurial > hg > orthanc
annotate Plugins/Engine/PluginsManager.cpp @ 896:c4053ac5db04 plugins
better plugni api
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 17 Jun 2014 09:57:02 +0200 |
parents | 690aeb4cb899 |
children | bafc9d592632 |
rev | line source |
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887 | 1 /** |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege, | |
4 * Belgium | |
5 * | |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU General Public License as | |
8 * published by the Free Software Foundation, either version 3 of the | |
9 * License, or (at your option) any later version. | |
10 * | |
11 * In addition, as a special exception, the copyright holders of this | |
12 * program give permission to link the code of its release with the | |
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
14 * that use the same license as the "OpenSSL" library), and distribute | |
15 * the linked executables. You must obey the GNU General Public License | |
16 * in all respects for all of the code used other than "OpenSSL". If you | |
17 * modify file(s) with this exception, you may extend this exception to | |
18 * your version of the file(s), but you are not obligated to do so. If | |
19 * you do not wish to do so, delete this exception statement from your | |
20 * version. If you delete this exception statement from all source files | |
21 * in the program, then also delete it here. | |
22 * | |
23 * This program is distributed in the hope that it will be useful, but | |
24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
26 * General Public License for more details. | |
27 * | |
28 * You should have received a copy of the GNU General Public License | |
29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
30 **/ | |
31 | |
32 | |
33 #include "PluginsManager.h" | |
34 | |
894 | 35 #include "../../Core/Toolbox.h" |
36 | |
887 | 37 #include <glog/logging.h> |
38 #include <cassert> | |
39 #include <memory> | |
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40 #include <boost/filesystem.hpp> |
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41 |
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42 #ifdef WIN32 |
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43 #define PLUGIN_EXTENSION ".dll" |
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44 #elif defined(__linux) |
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45 #define PLUGIN_EXTENSION ".so" |
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46 #else |
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47 #error Support your platform here |
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48 #endif |
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49 |
887 | 50 |
51 namespace Orthanc | |
52 { | |
53 static void CallInitialize(SharedLibrary& plugin, | |
54 const OrthancPluginContext& context) | |
55 { | |
56 typedef int32_t (*Initialize) (const OrthancPluginContext*); | |
57 | |
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58 #if defined(_WIN32) |
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59 Initialize initialize = (Initialize) plugin.GetFunction("OrthancPluginInitialize"); |
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60 #else |
887 | 61 /** |
62 * gcc would complain about "ISO C++ forbids casting between | |
63 * pointer-to-function and pointer-to-object" without the trick | |
64 * below, that is known as "the POSIX.1-2003 (Technical Corrigendum | |
65 * 1) workaround". See the man page of "dlsym()". | |
66 * http://www.trilithium.com/johan/2004/12/problem-with-dlsym/ | |
67 * http://stackoverflow.com/a/14543811/881731 | |
68 **/ | |
69 | |
70 Initialize initialize; | |
71 *(void **) (&initialize) = plugin.GetFunction("OrthancPluginInitialize"); | |
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72 #endif |
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73 |
887 | 74 assert(initialize != NULL); |
75 int32_t error = initialize(&context); | |
76 | |
77 if (error != 0) | |
78 { | |
79 LOG(ERROR) << "Error while initializing plugin " << plugin.GetPath() | |
80 << " (code " << error << ")"; | |
81 throw OrthancException(ErrorCode_SharedLibrary); | |
82 } | |
83 } | |
84 | |
85 | |
86 static void CallFinalize(SharedLibrary& plugin) | |
87 { | |
88 typedef void (*Finalize) (); | |
89 | |
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90 #if defined(_WIN32) |
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91 Finalize finalize = (Finalize) plugin.GetFunction("OrthancPluginFinalize"); |
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92 #else |
887 | 93 Finalize finalize; |
94 *(void **) (&finalize) = plugin.GetFunction("OrthancPluginFinalize"); | |
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95 #endif |
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96 |
887 | 97 assert(finalize != NULL); |
98 finalize(); | |
99 } | |
100 | |
101 | |
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102 static const char* CallGetName(SharedLibrary& plugin) |
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103 { |
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104 typedef const char* (*GetName) (); |
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105 |
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106 #if defined(_WIN32) |
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107 GetName getName = (GetName) plugin.GetFunction("OrthancPluginGetName"); |
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108 #else |
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109 GetName getName; |
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110 *(void **) (&getName) = plugin.GetFunction("OrthancPluginGetName"); |
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111 #endif |
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112 |
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113 assert(getName != NULL); |
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114 return getName(); |
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115 } |
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116 |
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117 |
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118 static const char* CallGetVersion(SharedLibrary& plugin) |
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119 { |
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120 typedef const char* (*GetVersion) (); |
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121 |
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122 #if defined(_WIN32) |
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123 GetVersion getVersion = (GetVersion) plugin.GetFunction("OrthancPluginGetVersion"); |
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124 #else |
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125 GetVersion getVersion; |
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126 *(void **) (&getVersion) = plugin.GetFunction("OrthancPluginGetVersion"); |
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127 #endif |
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128 |
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129 assert(getVersion != NULL); |
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130 return getVersion(); |
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131 } |
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132 |
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133 |
887 | 134 static void LogError(const char* str) |
135 { | |
136 LOG(ERROR) << str; | |
137 } | |
138 | |
139 static void LogWarning(const char* str) | |
140 { | |
141 LOG(WARNING) << str; | |
142 } | |
143 | |
144 static void LogInfo(const char* str) | |
145 { | |
146 LOG(INFO) << str; | |
147 } | |
148 | |
894 | 149 void PluginsManager::RegisterRestCallback(const OrthancPluginContext* context, |
896 | 150 const char* pathRegularExpression, |
151 OrthancPluginRestCallback callback) | |
887 | 152 { |
153 // TODO | |
896 | 154 LOG(INFO) << "Plugin has registered a REST callback on: " << pathRegularExpression; |
894 | 155 |
156 PluginsManager* manager = reinterpret_cast<PluginsManager*>(context->pimpl); | |
157 manager->restCallbacks_.push_back(callback); | |
158 | |
896 | 159 callback(NULL, OrthancPluginHttpMethod_Get, "/hello/world", NULL, 0); |
887 | 160 } |
161 | |
894 | 162 |
896 | 163 static void AnswerBuffer(OrthancPluginRestOutput* output, |
894 | 164 const char* answer, |
165 uint32_t answerSize, | |
166 const char* mimeType) | |
167 { | |
168 std::cout << "MIME " << mimeType << ": " << answer << std::endl; | |
169 } | |
170 | |
171 | |
887 | 172 PluginsManager::PluginsManager() |
173 { | |
894 | 174 memset(&context_, 0, sizeof(context_)); |
175 context_.pimpl = this; | |
887 | 176 context_.orthancVersion = ORTHANC_VERSION; |
894 | 177 context_.FreeBuffer = ::free; |
887 | 178 context_.LogError = LogError; |
179 context_.LogWarning = LogWarning; | |
180 context_.LogInfo = LogInfo; | |
894 | 181 context_.RegisterRestCallback = RegisterRestCallback; |
182 context_.AnswerBuffer = AnswerBuffer; | |
887 | 183 } |
184 | |
185 PluginsManager::~PluginsManager() | |
186 { | |
187 for (Plugins::iterator it = plugins_.begin(); it != plugins_.end(); it++) | |
188 { | |
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189 if (it->second != NULL) |
887 | 190 { |
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191 LOG(WARNING) << "Unregistering plugin '" << CallGetName(*it->second) |
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192 << "' (version " << CallGetVersion(*it->second) << ")"; |
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193 |
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194 CallFinalize(*(it->second)); |
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195 delete it->second; |
887 | 196 } |
197 } | |
198 } | |
199 | |
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200 |
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201 static bool IsOrthancPlugin(SharedLibrary& library) |
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202 { |
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203 return (library.HasFunction("OrthancPluginInitialize") && |
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204 library.HasFunction("OrthancPluginFinalize") && |
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205 library.HasFunction("OrthancPluginGetName") && |
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206 library.HasFunction("OrthancPluginGetVersion")); |
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207 } |
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208 |
887 | 209 |
210 void PluginsManager::RegisterPlugin(const std::string& path) | |
211 { | |
212 std::auto_ptr<SharedLibrary> plugin(new SharedLibrary(path)); | |
213 | |
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214 if (!IsOrthancPlugin(*plugin)) |
887 | 215 { |
216 LOG(ERROR) << "Plugin " << plugin->GetPath() | |
217 << " does not declare the proper entry functions"; | |
218 throw OrthancException(ErrorCode_SharedLibrary); | |
219 } | |
220 | |
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221 std::string name(CallGetName(*plugin)); |
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222 if (plugins_.find(name) != plugins_.end()) |
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223 { |
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224 LOG(ERROR) << "Plugin '" << name << "' already registered"; |
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225 throw OrthancException(ErrorCode_SharedLibrary); |
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226 } |
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227 |
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228 LOG(WARNING) << "Registering plugin '" << name |
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229 << "' (version " << CallGetVersion(*plugin) << ")"; |
887 | 230 |
231 CallInitialize(*plugin, context_); | |
232 | |
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233 plugins_[name] = plugin.release(); |
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234 } |
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235 |
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236 |
889 | 237 void PluginsManager::ScanFolderForPlugins(const std::string& folder, |
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238 bool isRecursive) |
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239 { |
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240 using namespace boost::filesystem; |
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241 |
889 | 242 if (!exists(folder)) |
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243 { |
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244 return; |
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245 } |
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246 |
889 | 247 LOG(INFO) << "Scanning folder " << folder << " for plugins"; |
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248 |
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249 directory_iterator end_it; // default construction yields past-the-end |
889 | 250 for (directory_iterator it(folder); |
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251 it != end_it; |
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252 ++it) |
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253 { |
889 | 254 std::string path = it->path().string(); |
255 | |
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256 if (is_directory(it->status())) |
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257 { |
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258 if (isRecursive) |
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259 { |
889 | 260 ScanFolderForPlugins(path, true); |
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261 } |
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262 } |
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263 else |
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264 { |
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265 if (boost::filesystem::extension(it->path()) == PLUGIN_EXTENSION) |
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266 { |
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267 LOG(INFO) << "Found a shared library: " << it->path(); |
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268 |
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269 try |
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270 { |
889 | 271 SharedLibrary plugin(path); |
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272 if (IsOrthancPlugin(plugin)) |
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273 { |
889 | 274 RegisterPlugin(path); |
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275 } |
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276 } |
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277 catch (OrthancException&) |
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278 { |
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279 } |
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280 } |
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281 } |
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282 } |
887 | 283 } |
284 } |