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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
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4 * Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "PluginsManager.h"
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34
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35 #include <glog/logging.h>
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36 #include <cassert>
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37 #include <memory>
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38
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39 namespace Orthanc
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40 {
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41 static void CallInitialize(SharedLibrary& plugin,
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42 const OrthancPluginContext& context)
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43 {
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44 typedef int32_t (*Initialize) (const OrthancPluginContext*);
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45
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46 /**
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47 * gcc would complain about "ISO C++ forbids casting between
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48 * pointer-to-function and pointer-to-object" without the trick
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49 * below, that is known as "the POSIX.1-2003 (Technical Corrigendum
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50 * 1) workaround". See the man page of "dlsym()".
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51 * http://www.trilithium.com/johan/2004/12/problem-with-dlsym/
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52 * http://stackoverflow.com/a/14543811/881731
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53 **/
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54
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55 Initialize initialize;
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56 *(void **) (&initialize) = plugin.GetFunction("OrthancPluginInitialize");
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57 assert(initialize != NULL);
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58
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59 int32_t error = initialize(&context);
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60
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61 if (error != 0)
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62 {
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63 LOG(ERROR) << "Error while initializing plugin " << plugin.GetPath()
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64 << " (code " << error << ")";
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65 throw OrthancException(ErrorCode_SharedLibrary);
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66 }
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67 }
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68
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69
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70 static void CallFinalize(SharedLibrary& plugin)
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71 {
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72 typedef void (*Finalize) ();
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73
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74 Finalize finalize;
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75 *(void **) (&finalize) = plugin.GetFunction("OrthancPluginFinalize");
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76 assert(finalize != NULL);
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77
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78 finalize();
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79 }
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80
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81
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82 static void LogError(const char* str)
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83 {
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84 LOG(ERROR) << str;
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85 }
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86
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87 static void LogWarning(const char* str)
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88 {
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89 LOG(WARNING) << str;
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90 }
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91
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92 static void LogInfo(const char* str)
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93 {
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94 LOG(INFO) << str;
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95 }
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96
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97 static int32_t InvokeService(const char* serviceName,
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98 const void* serviceParameters)
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99 {
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100 // TODO
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101 return 0;
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102 }
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103
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104 PluginsManager::PluginsManager()
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105 {
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106 context_.orthancVersion = ORTHANC_VERSION;
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107 context_.InvokeService = InvokeService;
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108 context_.LogError = LogError;
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109 context_.LogWarning = LogWarning;
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110 context_.LogInfo = LogInfo;
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111 }
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112
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113 PluginsManager::~PluginsManager()
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114 {
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115 for (Plugins::iterator it = plugins_.begin(); it != plugins_.end(); it++)
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116 {
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117 if (*it != NULL)
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118 {
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119 CallFinalize(**it);
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120 delete *it;
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121 }
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122 }
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123 }
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124
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125
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126 void PluginsManager::RegisterPlugin(const std::string& path)
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127 {
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128 std::auto_ptr<SharedLibrary> plugin(new SharedLibrary(path));
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129
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130 if (!plugin->HasFunction("OrthancPluginInitialize") ||
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131 !plugin->HasFunction("OrthancPluginFinalize"))
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132 {
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133 LOG(ERROR) << "Plugin " << plugin->GetPath()
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134 << " does not declare the proper entry functions";
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135 throw OrthancException(ErrorCode_SharedLibrary);
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136 }
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137
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138 LOG(WARNING) << "Registering plugin " << path;
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139
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140 CallInitialize(*plugin, context_);
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141
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142 plugins_.push_back(plugin.release());
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143 }
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144
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145 }
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