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1 /**
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2 * Python plugin for Orthanc
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3 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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4 *
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5 * This program is free software: you can redistribute it and/or
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6 * modify it under the terms of the GNU Affero General Public License
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7 * as published by the Free Software Foundation, either version 3 of
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8 * the License, or (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful, but
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11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Affero General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Affero General Public License
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16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 **/
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18
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19
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20 // http://edcjones.tripod.com/refcount.html
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21 // https://docs.python.org/3/extending/extending.html
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22
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23 // https://www.codevate.com/blog/7-concurrency-with-embedded-python-in-a-multi-threaded-c-application
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24 // https://fr.slideshare.net/YiLungTsai/embed-python
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25
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26
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27 #include "OnStoredInstanceCallback.h"
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28 #include "OnChangeCallback.h"
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29 #include "RestCallbacks.h"
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30 #include "PythonModule.h"
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31
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32 #include "Autogenerated/sdk.h"
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33
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34 #include <OrthancPluginCppWrapper.h>
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35
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36 #include <boost/algorithm/string/predicate.hpp>
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37 #include <boost/filesystem.hpp>
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38
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39 #if !defined(_WIN32)
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40 # include <dlfcn.h>
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41 #endif
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42
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43
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44
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45 static bool pythonEnabled_ = false;
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46 static std::string userScriptName_;
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47 static std::vector<PyMethodDef> globalFunctions_;
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48
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49
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50 static void InstallClasses(PyObject* module)
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51 {
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52 RegisterOrthancSdk(module);
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53 }
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54
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55
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56 static void SetupGlobalFunctions()
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57 {
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58 if (!globalFunctions_.empty())
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59 {
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60 ORTHANC_PLUGINS_THROW_EXCEPTION(BadSequenceOfCalls);
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61 }
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62
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63 /**
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64 * Add all the manual global functions
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65 **/
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66
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67 std::list<PyMethodDef> functions;
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68
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69 {
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70 PyMethodDef f = { "RegisterRestCallback", RegisterRestCallback, METH_VARARGS, "" };
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71 functions.push_back(f);
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72 }
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73
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74 {
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75 PyMethodDef f = { "RegisterOnChangeCallback", RegisterOnChangeCallback, METH_VARARGS, "" };
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76 functions.push_back(f);
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77 }
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78
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79 {
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80 PyMethodDef f = { "RegisterOnStoredInstanceCallback", RegisterOnStoredInstanceCallback,
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81 METH_VARARGS, "" };
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82 functions.push_back(f);
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83 }
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84
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85 /**
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86 * Append all the global functions that were automatically generated
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87 **/
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88
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89 const PyMethodDef* sdk = GetOrthancSdkFunctions();
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90
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91 for (size_t i = 0; sdk[i].ml_name != NULL; i++)
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92 {
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93 functions.push_back(sdk[i]);
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94 }
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95
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96 /**
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97 * Flatten the list of functions into the vector
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98 **/
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99
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100 globalFunctions_.resize(functions.size());
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101 std::copy(functions.begin(), functions.end(), globalFunctions_.begin());
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102
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103 PyMethodDef sentinel = { NULL };
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104 globalFunctions_.push_back(sentinel);
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105 }
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106
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107
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108 static PyMethodDef* GetGlobalFunctions()
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109 {
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110 if (globalFunctions_.empty())
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111 {
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112 // "SetupGlobalFunctions()" should have been called
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113 ORTHANC_PLUGINS_THROW_EXCEPTION(BadSequenceOfCalls);
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114 }
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115 else
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116 {
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117 return &globalFunctions_[0];
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118 }
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119 }
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120
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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 #if !defined(_WIN32)
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126
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127 #include <link.h> // For dl_phdr_info
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128
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129 static int ForceImportCallback(struct dl_phdr_info *info, size_t size, void *data)
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130 {
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131 /**
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132 * The following line solves the error: "ImportError:
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133 * /usr/lib/python2.7/dist-packages/PIL/_imaging.x86_64-linux-gnu.so:
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134 * undefined symbol: PyExc_SystemError"
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135 * https://stackoverflow.com/a/48517485/881731
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136 *
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137 * dlopen("/usr/lib/x86_64-linux-gnu/libpython2.7.so", RTLD_NOW | RTLD_LAZY | RTLD_GLOBAL);
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138 *
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139 * Another fix consists in using LD_PRELOAD as follows:
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140 * LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libpython2.7.so ~/Subversion/orthanc/i/Orthanc tutu.json
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141 **/
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142
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143 std::string module(info->dlpi_name);
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144
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145 if (module.find("python") != std::string::npos)
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146 {
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147 OrthancPlugins::LogWarning("Force global loading of Python shared library: " + module);
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148 dlopen(module.c_str(), RTLD_NOW | RTLD_LAZY | RTLD_GLOBAL);
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149 }
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150
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151 return 0;
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152 }
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153
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154 #endif
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155
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156
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157 extern "C"
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158 {
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159 ORTHANC_PLUGINS_API int32_t OrthancPluginInitialize(OrthancPluginContext* c)
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160 {
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161 OrthancPlugins::SetGlobalContext(c);
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162
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163 OrthancPlugins::LogWarning("Python plugin is initializing");
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164
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165
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166 /* Check the version of the Orthanc core */
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167 if (OrthancPluginCheckVersion(c) == 0)
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168 {
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169 char info[1024];
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170 sprintf(info, "Your version of Orthanc (%s) must be above %d.%d.%d to run this plugin",
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171 c->orthancVersion,
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172 ORTHANC_PLUGINS_MINIMAL_MAJOR_NUMBER,
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173 ORTHANC_PLUGINS_MINIMAL_MINOR_NUMBER,
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174 ORTHANC_PLUGINS_MINIMAL_REVISION_NUMBER);
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175 OrthancPluginLogError(c, info);
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176 return -1;
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177 }
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178
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179
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180 try
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181 {
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182 /**
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183 * Detection of the user script
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184 **/
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185
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186 OrthancPlugins::OrthancConfiguration config;
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187
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188 static const char* const OPTION = "PythonScript";
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189
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190 std::string script;
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191 if (!config.LookupStringValue(script, OPTION))
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192 {
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193 pythonEnabled_ = false;
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194
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195 OrthancPlugins::LogWarning("The option \"" + std::string(OPTION) + "\" is not provided: " +
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196 "Python scripting is disabled");
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197 }
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198 else
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199 {
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200 pythonEnabled_ = true;
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201
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202 /**
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203 * Installation of the user script
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204 **/
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205
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206 const boost::filesystem::path path(script);
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207 if (!boost::iequals(path.extension().string(), ".py"))
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208 {
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209 OrthancPlugins::LogError("Python script must have the \".py\" file extension: " +
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210 path.string());
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211 return -1;
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212 }
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213
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214 if (!boost::filesystem::is_regular_file(path))
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215 {
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216 OrthancPlugins::LogError("Inexistent directory for the Python script: " +
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217 path.string());
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218 return -1;
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219 }
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220
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221 boost::filesystem::path userScriptDirectory = boost::filesystem::absolute(path).parent_path();
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222
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223 {
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224 boost::filesystem::path module = path.filename().replace_extension("");
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225 userScriptName_ = module.string();
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226 }
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227
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228 OrthancPlugins::LogWarning("Using Python script \"" + userScriptName_ +
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229 ".py\" from directory: " + userScriptDirectory.string());
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230
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231
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232 /**
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233 * Initialization of Python
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234 **/
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235
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236 #if !defined(_WIN32)
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237 dl_iterate_phdr(ForceImportCallback, NULL);
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238 #endif
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239
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240 SetupGlobalFunctions();
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241 PythonLock::GlobalInitialize("orthanc", "Exception",
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242 GetGlobalFunctions, InstallClasses,
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243 config.GetBooleanValue("PythonVerbose", false));
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244 PythonLock::AddSysPath(userScriptDirectory.string());
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245
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246
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247 /**
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248 * Force loading the declarations in the user script
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249 **/
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250
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251 PythonLock lock;
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252
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253 {
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254 PythonModule module(lock, userScriptName_);
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255 }
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256
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257 std::string traceback;
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258 if (lock.HasErrorOccurred(traceback))
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259 {
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260 OrthancPlugins::LogError("Error during the installation of the Python script, "
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261 "traceback:\n" + traceback);
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262 return -1;
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263 }
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264 }
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265 }
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266 catch (ORTHANC_PLUGINS_EXCEPTION_CLASS& e)
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267 {
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268 OrthancPlugins::LogError("Exception while starting the Python plugin: " +
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269 std::string(e.What(c)));
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270 return -1;
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271 }
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272
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273 return 0;
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274 }
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275
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276
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277 ORTHANC_PLUGINS_API void OrthancPluginFinalize()
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278 {
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279 OrthancPlugins::LogWarning("Python plugin is finalizing");
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280
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281 if (pythonEnabled_)
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282 {
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283 FinalizeOnChangeCallback();
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284 FinalizeRestCallbacks();
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285 FinalizeOnStoredInstanceCallback();
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286
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287 PythonLock::GlobalFinalize();
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288 }
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289 }
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290
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291
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292 ORTHANC_PLUGINS_API const char* OrthancPluginGetName()
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293 {
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294 return "python";
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295 }
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296
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297
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298 ORTHANC_PLUGINS_API const char* OrthancPluginGetVersion()
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299 {
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300 return PLUGIN_VERSION;
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301 }
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302 }
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