annotate Sources/OnChangeCallback.cpp @ 43:eec99a934b6a OrthancPython-2.0

OrthancPython-2.0
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 08 Jul 2020 15:17:58 +0200
parents fd58eb5749ed
children ee76cced46a5
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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 #include "OnChangeCallback.h"
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21
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22 #include "PythonObject.h"
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23
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24 #include "../Resources/Orthanc/Plugins/OrthancPluginCppWrapper.h"
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25
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26 #include <Compatibility.h> // For std::unique_ptr<>
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28 #include <boost/thread.hpp>
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31 class PendingChange : public boost::noncopyable
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32 {
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33 private:
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34 OrthancPluginChangeType changeType_;
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35 OrthancPluginResourceType resourceType_;
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36 std::string resourceId_;
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37
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38 public:
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39 PendingChange(OrthancPluginChangeType changeType,
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40 OrthancPluginResourceType resourceType,
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41 const char* resourceId) :
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42 changeType_(changeType),
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43 resourceType_(resourceType)
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44 {
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45 if (resourceId == NULL)
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46 {
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47 resourceId_.clear();
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48 }
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49 else
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50 {
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51 resourceId_.assign(resourceId);
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52 }
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53 }
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54
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55 OrthancPluginChangeType GetChangeType() const
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56 {
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57 return changeType_;
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58 }
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59
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60 OrthancPluginResourceType GetResourceType() const
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61 {
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62 return resourceType_;
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63 }
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64
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65 const std::string& GetResourceId() const
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66 {
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67 return resourceId_;
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68 }
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69 };
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71
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72
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73 class PendingChanges : public boost::noncopyable
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74 {
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75 private:
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76 typedef std::list<PendingChange*> Queue;
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77
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78 boost::mutex mutex_;
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79 Queue queue_;
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80 boost::condition_variable elementAvailable_;
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81
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82 public:
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83 ~PendingChanges()
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84 {
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85 for (Queue::iterator it = queue_.begin(); it != queue_.end(); ++it)
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86 {
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87 assert(*it != NULL);
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88 delete *it;
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89 }
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90 }
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91
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92 void Enqueue(OrthancPluginChangeType changeType,
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93 OrthancPluginResourceType resourceType,
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94 const char* resourceId)
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95 {
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96 boost::mutex::scoped_lock lock(mutex_);
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97 queue_.push_back(new PendingChange(changeType, resourceType, resourceId));
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98 elementAvailable_.notify_one();
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99 }
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100
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101 PendingChange* Dequeue(unsigned int millisecondsTimeout)
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102 {
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103 if (millisecondsTimeout == 0)
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104 {
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105 ORTHANC_PLUGINS_THROW_EXCEPTION(ParameterOutOfRange);
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106 }
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107
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108 boost::mutex::scoped_lock lock(mutex_);
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109
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110 // Wait for a message to arrive in the FIFO queue
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111 while (queue_.empty())
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112 {
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113 bool success = elementAvailable_.timed_wait
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114 (lock, boost::posix_time::milliseconds(millisecondsTimeout));
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115 if (!success)
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116 {
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117 return NULL;
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118 }
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119 }
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120
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121 std::unique_ptr<PendingChange> change(queue_.front());
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122 queue_.pop_front();
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123
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124 return change.release();
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125 }
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126 };
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127
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128
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129
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130 static PendingChanges pendingChanges_;
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131 static bool stopping_ = false;
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132 static boost::thread changesThread_;
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133 static PyObject* changesCallback_ = NULL;
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134
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135
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136 static void ChangesWorker()
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137 {
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138 while (!stopping_)
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139 {
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140 for (;;)
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141 {
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142 std::unique_ptr<PendingChange> change(pendingChanges_.Dequeue(100));
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143 if (change.get() == NULL)
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144 {
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145 break;
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146 }
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147 else if (changesCallback_ != NULL)
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148 {
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149 try
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150 {
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151 PythonLock lock;
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152 PythonObject args(lock, PyTuple_New(3));
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153 PyTuple_SetItem(args.GetPyObject(), 0, PyLong_FromLong(change->GetChangeType()));
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154 PyTuple_SetItem(args.GetPyObject(), 1, PyLong_FromLong(change->GetResourceType()));
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155 PyTuple_SetItem(args.GetPyObject(), 2, PyUnicode_FromString(change->GetResourceId().c_str()));
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156 PythonObject result(lock, PyObject_CallObject(changesCallback_, args.GetPyObject()));
3
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157
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158 std::string traceback;
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159 if (lock.HasErrorOccurred(traceback))
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160 {
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161 OrthancPlugins::LogError("Error in the Python on-change callback, "
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162 "traceback:\n" + traceback);
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163 }
0
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164 }
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165 catch (OrthancPlugins::PluginException& e)
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166 {
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167 OrthancPlugins::LogError("Error during Python on-change callback: " +
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168 std::string(e.What(OrthancPlugins::GetGlobalContext())));
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169 }
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170 }
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171 }
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172 }
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173 }
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174
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175
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176 static OrthancPluginErrorCode OnChangeCallback(OrthancPluginChangeType changeType,
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177 OrthancPluginResourceType resourceType,
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178 const char* resourceId)
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179 {
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180 {
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181 PythonLock lock;
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182 pendingChanges_.Enqueue(changeType, resourceType, resourceId);
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183 }
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184
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185 return OrthancPluginErrorCode_Success;
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186 }
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187
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188
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189 PyObject* RegisterOnChangeCallback(PyObject* module, PyObject* args)
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190 {
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191 // The GIL is locked at this point (no need to create "PythonLock")
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192
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193 // https://docs.python.org/3/extending/extending.html#calling-python-functions-from-c
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194 PyObject* callback = NULL;
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195
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196 if (!PyArg_ParseTuple(args, "O", &callback) ||
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197 callback == NULL)
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198 {
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199 PyErr_SetString(PyExc_ValueError, "Expected a callback function");
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200 return NULL;
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201 }
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202
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203 if (changesCallback_ != NULL)
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204 {
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205 PyErr_SetString(PyExc_RuntimeError, "Can only register one Python on-changes callback");
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206 return NULL;
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207 }
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208
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209 OrthancPlugins::LogInfo("Registering a Python on-changes callback");
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210
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211 OrthancPluginRegisterOnChangeCallback(OrthancPlugins::GetGlobalContext(), OnChangeCallback);
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212
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213 stopping_ = false;
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214 changesThread_ = boost::thread(ChangesWorker);
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215
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216 changesCallback_ = callback;
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217 Py_XINCREF(changesCallback_);
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218
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219 Py_INCREF(Py_None);
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220 return Py_None;
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221 }
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222
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223
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224
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225
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226 void FinalizeOnChangeCallback()
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227 {
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228 stopping_ = true;
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229
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230 if (changesThread_.joinable())
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231 {
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232 changesThread_.join();
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233 }
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234
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235 {
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236 PythonLock lock;
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237
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238 if (changesCallback_ != NULL)
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239 {
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240 Py_XDECREF(changesCallback_);
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241 }
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242 }
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243 }