Mercurial > hg > orthanc
annotate Plugins/Engine/PluginsManager.cpp @ 894:690aeb4cb899 plugins
REST callbacks
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Mon, 16 Jun 2014 17:31:09 +0200 |
| parents | f57802f8b4dc |
| children | c4053ac5db04 |
| rev | line source |
|---|---|
| 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, |
| 150 const char* path, | |
| 151 OrthancRestCallback callback) | |
| 887 | 152 { |
| 153 // TODO | |
| 894 | 154 LOG(INFO) << "Plugin has registered a REST callback on: " << path; |
| 155 | |
| 156 PluginsManager* manager = reinterpret_cast<PluginsManager*>(context->pimpl); | |
| 157 manager->restCallbacks_.push_back(callback); | |
| 158 | |
| 159 | |
| 160 const char* pp = "/hello/world"; | |
| 161 | |
| 162 UriComponents components; | |
| 163 Toolbox::SplitUriComponents(components, pp); | |
| 164 | |
| 165 OrthancRestUrl url; | |
| 166 url.path = pp; | |
| 167 | |
| 168 std::vector<const char*> c(components.size()); | |
| 169 for (unsigned int i = 0; i < components.size(); i++) | |
| 170 { | |
| 171 c[i] = components[i].c_str(); | |
| 172 } | |
| 173 | |
| 174 if (components.size() == 0) | |
| 175 { | |
| 176 url.components = NULL; | |
| 177 url.componentsSize = 0; | |
| 178 } | |
| 179 else | |
| 180 { | |
| 181 url.components = &c[0]; | |
| 182 url.componentsSize = components.size(); | |
| 183 } | |
| 184 | |
| 185 // TODO | |
| 186 url.parameters = NULL; | |
| 187 url.parametersSize = 0; | |
| 188 | |
| 189 callback(NULL, OrthancHttpMethod_Get, &url, NULL, 0); | |
| 887 | 190 } |
| 191 | |
| 894 | 192 |
| 193 static void AnswerBuffer(OrthancRestOutput* output, | |
| 194 const char* answer, | |
| 195 uint32_t answerSize, | |
| 196 const char* mimeType) | |
| 197 { | |
| 198 std::cout << "MIME " << mimeType << ": " << answer << std::endl; | |
| 199 } | |
| 200 | |
| 201 | |
| 887 | 202 PluginsManager::PluginsManager() |
| 203 { | |
| 894 | 204 memset(&context_, 0, sizeof(context_)); |
| 205 context_.pimpl = this; | |
| 887 | 206 context_.orthancVersion = ORTHANC_VERSION; |
| 894 | 207 context_.FreeBuffer = ::free; |
| 887 | 208 context_.LogError = LogError; |
| 209 context_.LogWarning = LogWarning; | |
| 210 context_.LogInfo = LogInfo; | |
| 894 | 211 context_.RegisterRestCallback = RegisterRestCallback; |
| 212 context_.AnswerBuffer = AnswerBuffer; | |
| 887 | 213 } |
| 214 | |
| 215 PluginsManager::~PluginsManager() | |
| 216 { | |
| 217 for (Plugins::iterator it = plugins_.begin(); it != plugins_.end(); it++) | |
| 218 { | |
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219 if (it->second != NULL) |
| 887 | 220 { |
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221 LOG(WARNING) << "Unregistering plugin '" << CallGetName(*it->second) |
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222 << "' (version " << CallGetVersion(*it->second) << ")"; |
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223 |
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224 CallFinalize(*(it->second)); |
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225 delete it->second; |
| 887 | 226 } |
| 227 } | |
| 228 } | |
| 229 | |
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230 |
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231 static bool IsOrthancPlugin(SharedLibrary& library) |
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232 { |
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233 return (library.HasFunction("OrthancPluginInitialize") && |
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234 library.HasFunction("OrthancPluginFinalize") && |
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235 library.HasFunction("OrthancPluginGetName") && |
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236 library.HasFunction("OrthancPluginGetVersion")); |
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237 } |
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238 |
| 887 | 239 |
| 240 void PluginsManager::RegisterPlugin(const std::string& path) | |
| 241 { | |
| 242 std::auto_ptr<SharedLibrary> plugin(new SharedLibrary(path)); | |
| 243 | |
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244 if (!IsOrthancPlugin(*plugin)) |
| 887 | 245 { |
| 246 LOG(ERROR) << "Plugin " << plugin->GetPath() | |
| 247 << " does not declare the proper entry functions"; | |
| 248 throw OrthancException(ErrorCode_SharedLibrary); | |
| 249 } | |
| 250 | |
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251 std::string name(CallGetName(*plugin)); |
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252 if (plugins_.find(name) != plugins_.end()) |
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253 { |
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254 LOG(ERROR) << "Plugin '" << name << "' already registered"; |
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255 throw OrthancException(ErrorCode_SharedLibrary); |
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256 } |
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257 |
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258 LOG(WARNING) << "Registering plugin '" << name |
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259 << "' (version " << CallGetVersion(*plugin) << ")"; |
| 887 | 260 |
| 261 CallInitialize(*plugin, context_); | |
| 262 | |
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263 plugins_[name] = plugin.release(); |
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264 } |
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265 |
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266 |
| 889 | 267 void PluginsManager::ScanFolderForPlugins(const std::string& folder, |
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268 bool isRecursive) |
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269 { |
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270 using namespace boost::filesystem; |
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271 |
| 889 | 272 if (!exists(folder)) |
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273 { |
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274 return; |
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275 } |
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276 |
| 889 | 277 LOG(INFO) << "Scanning folder " << folder << " for plugins"; |
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278 |
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279 directory_iterator end_it; // default construction yields past-the-end |
| 889 | 280 for (directory_iterator it(folder); |
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281 it != end_it; |
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282 ++it) |
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283 { |
| 889 | 284 std::string path = it->path().string(); |
| 285 | |
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286 if (is_directory(it->status())) |
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287 { |
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288 if (isRecursive) |
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289 { |
| 889 | 290 ScanFolderForPlugins(path, true); |
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291 } |
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292 } |
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293 else |
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294 { |
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295 if (boost::filesystem::extension(it->path()) == PLUGIN_EXTENSION) |
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296 { |
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297 LOG(INFO) << "Found a shared library: " << it->path(); |
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298 |
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299 try |
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300 { |
| 889 | 301 SharedLibrary plugin(path); |
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302 if (IsOrthancPlugin(plugin)) |
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303 { |
| 889 | 304 RegisterPlugin(path); |
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305 } |
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306 } |
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307 catch (OrthancException&) |
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308 { |
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309 } |
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310 } |
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311 } |
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312 } |
| 887 | 313 } |
| 314 | |
| 315 } |