annotate Sphinx/source/plugins/python.rst @ 472:03dfb896ca4b

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 04 Aug 2020 20:53:35 +0200
parents a735476a0e6e 46949efa5818
children 933e28b6a64d
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1 .. _python-plugin:
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2
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3
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4 Python plugin for Orthanc
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5 =========================
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6
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7 .. contents::
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9
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10 Overview
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11 --------
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12
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13 This plugin can be used to write :ref:`Orthanc plugins
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14 <creating-plugins>` using the `Python programming language
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15 <https://en.wikipedia.org/wiki/Python_(programming_language)>`__
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16 instead of the more complex C/C++ programming languages.
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17
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18 Python plugins have access to more features and a more consistent SDK
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19 than :ref:`Lua scripts <lua>`. The Python API is automatically
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20 generated from the `Orthanc plugin SDK in C
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21 <https://hg.orthanc-server.com/orthanc/file/Orthanc-1.7.2/OrthancServer/Plugins/Include/orthanc/OrthancCPlugin.h>`__
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22 using the `Clang <https://en.wikipedia.org/wiki/Clang>`__ compiler
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23 front-end.
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24
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25 As of release 2.0 of the plugin, the coverage of the C SDK is about
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26 75% (119 functions are automatically wrapped in Python out of a total
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27 of 157 functions in the Orthanc SDK 1.7.2).
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29
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30 Source code
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31 -----------
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32
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33 * Link to the `official releases of this plugin
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34 <https://www.orthanc-server.com/browse.php?path=/plugin-python>`__.
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35
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36 * Link to the `code repository
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37 <https://hg.orthanc-server.com/orthanc-python/>`__.
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39
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40 Licensing
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41 ---------
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42
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43 Pay attention to the fact that this plugin is licensed under the terms
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44 of the `AGPL license
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45 <https://en.wikipedia.org/wiki/GNU_Affero_General_Public_License>`__.
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46
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47 This has an important consequence: If you distribute Orthanc to
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48 clients together with one Python script, or if you put an Orthanc
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49 server equipped with one Python script on a Web portal, you **must**
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50 disclose the source code of your Python script to the Orthanc
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51 community under the terms of the AGPL license.
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52
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53 We suggest you to put the source code of your Python scripts on the
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54 dedicated `"OrthancContributed" repository on GitHub
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55 <https://github.com/jodogne/OrthancContributed/tree/master/Plugins>`__,
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56 and/or to send it to the `Orthanc Users
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57 <https://groups.google.com/forum/#!forum/orthanc-users>`__ discussion
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58 group.
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59
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60 Check out the :ref:`FAQ about licensing <licensing>` for more context.
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61
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62
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63 Usage
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64 -----
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65
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66 Docker
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67 ......
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68
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69 .. highlight:: json
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70
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71 The most direct way of starting Orthanc together with the Python
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72 plugin is through :ref:`Docker <docker>`. Let's create the file
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73 ``/tmp/hello.py`` that contains the following basic Python script::
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74
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75 print('Hello world!')
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76
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77 .. highlight:: json
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78
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79 Let's also create the file ``/tmp/orthanc.json`` that contains the
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80 following minimal :ref:`configuration for Orthanc <configuration>`::
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81
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82 {
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83 "StorageDirectory" : "/var/lib/orthanc/db",
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84 "RemoteAccessAllowed" : true,
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85 "Plugins" : [
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86 "/usr/local/share/orthanc/plugins"
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87 ],
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88 "PythonScript" : "/etc/orthanc/hello.py"
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89 }
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90
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91 .. highlight:: bash
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92
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93 Given these two files, Orthanc can be started as follows::
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94
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95 $ docker run -p 4242:4242 -p 8042:8042 --rm \
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96 -v /tmp/orthanc.json:/etc/orthanc/orthanc.json:ro \
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97 -v /tmp/hello.py:/etc/orthanc/hello.py:ro \
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98 jodogne/orthanc-python
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99
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100 .. highlight:: text
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101
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102 You'll see the following excerpt in the log, which indicates that the Python plugin is properly loaded::
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103
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104 W0331 15:48:12.990661 PluginsManager.cpp:269] Registering plugin 'python' (version mainline)
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105 W0331 15:48:12.990691 PluginsManager.cpp:168] Python plugin is initializing
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106 W0331 15:48:12.990743 PluginsManager.cpp:168] Using Python script "hello.py" from directory: /etc/orthanc
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107 W0331 15:48:12.990819 PluginsManager.cpp:168] Program name: /usr/local/sbin/Orthanc
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108 Hello world!
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109
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110
405
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111 `Here <https://bitbucket.org/osimis/orthanc-setup-samples/src/master/docker/python/>`__ is a full example
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112 of a more complex setup using the :ref:`osimis/orthanc <docker-osimis>` images.
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113
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114 Compiling from source
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115 .....................
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116
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117 .. highlight:: bash
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118
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119 The procedure to compile this plugin from source is similar to that
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120 for the :ref:`core of Orthanc <compiling>`. The following commands
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121 should work for most UNIX-like distribution (including GNU/Linux)::
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122
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123 $ mkdir Build
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124 $ cd Build
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125 $ cmake .. -DPYTHON_VERSION=3.7 -DSTATIC_BUILD=ON -DCMAKE_BUILD_TYPE=Release
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126 $ make
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127
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128 Before running CMake, make sure that the Python interpreter and its
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129 associated development library are installed. On Ubuntu 18.04 LTS, you
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130 would for instance install packages ``libpython3.7-dev`` and
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131 ``python3.7``.
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132
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133 The compilation will produce the shared library ``OrthancPython``,
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134 that can be loaded by properly setting the ``Plugins``
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135 :ref:`configuration option <configuration>` of Orthanc.
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136
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137 **Warning:** The shared library is only compatible with the Python
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138 interpreter whose version corresponds to the value of the
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139 ``PYTHON_VERSION`` argument that was given to CMake.
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140
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141
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142 Microsoft Windows
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143 .................
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144
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145 Pre-compiled binaries for Microsoft Windows `are also available
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146 <https://www.orthanc-server.com/browse.php?path=/plugin-python>`__.
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147
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148 Beware that one version of the Python plugin can only be run against
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149 one version of the Python interpreter. This version is clearly
442
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150 indicated in the filename of the precompiled binaries.
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151
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152 .. highlight:: text
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153
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154 You are of course free to compile the plugin from sources. You'll have
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155 to explicitly specify the path to your Python installation while
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156 invoking CMake. For instance::
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157
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158 C:\orthanc-python\Build> cmake .. -DPYTHON_VERSION=2.7 -DPYTHON_WINDOWS_ROOT=C:/Python27 \
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159 -DSTATIC_BUILD=ON -DCMAKE_BUILD_TYPE=Release -G "Visual Studio 15 2017"
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160
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161 **Note about debug builds**: Usually, building Python modules such as the Python
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162 plugin for Orthanc in debug mode (where ``_DEBUG`` is defined) leads to a module
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163 (``.exe`` or ``.dll``) that requires a debug build of Python, and debug versions of all
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164 the Python libraries. This is quite cumbersome, for it requires building Python
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165 on your own or downloading additional debug files.
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166
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167 Since using a debug build of Python is only necessary in very specific cases
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168 (such as the debugging of code at the boundary between Python and an extension),
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169 we have changed the default behavior to use the release Python library by default.
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170
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171 This means that you are able to build this plugin in debug mode with the
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172 standard Python distribution.
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173
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174 In case you need to use the Python debug libraries, you can instruct the build
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175 system to do so by setting the ``PYTHON_WINDOWS_USE_RELEASE_LIBS`` CMake option,
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176 that is ``ON`` by default, to ``OFF``. The previous build example would then be,
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177 should you require a full debug build::
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178
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179 C:\orthanc-python\Build> cmake .. -DPYTHON_VERSION=2.7 -DPYTHON_WINDOWS_ROOT=C:/Python27 \
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180 -DSTATIC_BUILD=ON -DPYTHON_WINDOWS_USE_RELEASE_LIBS=OFF \
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181 -DCMAKE_BUILD_TYPE=Debug -G "Visual Studio 15 2017"
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182
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183 Please note that this CMake option only impacts **debug** builds under Windows,
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184 when using (any version of) the Microsoft Visual Studio compiler.
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185
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186 The precompiled binaries all use release (i.e. non-debug) versions of Python.
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187
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188
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189 Configuration options
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190 ---------------------
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191
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192 The only two configuration options that are available for this plugin
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193 are the following:
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194
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195 * ``PythonScript`` indicates where the Python script is located. If
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196 this configuration option is not provided, the Python plugin is not
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197 started.
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198
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199 * ``PythonVerbose`` is a Boolean value to make the Python interpreter
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200 verbose.
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201
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202
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203 Samples
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204 -------
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205
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206 Extending the REST API
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207 ......................
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208
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209 .. highlight:: python
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210
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211 Here is a basic Python script that registers two new routes in the
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212 REST API::
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213
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214 import orthanc
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215 import pprint
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216
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217 def OnRest(output, uri, **request):
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218 pprint.pprint(request)
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219 print('Accessing uri: %s' % uri)
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220 output.AnswerBuffer('ok\n', 'text/plain')
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221
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222 orthanc.RegisterRestCallback('/(to)(t)o', OnRest)
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223 orthanc.RegisterRestCallback('/tata', OnRest)
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224
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225 .. highlight:: json
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226
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227 Here is the associated minimal configuration file for Orthanc
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228 (provided the Python script is saved as ``rest.py``)::
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229
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230 {
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231 "Plugins" : [ "." ],
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232 "PythonScript" : "rest.py",
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233 "PythonVerbose" : false
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234 }
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235
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236 .. highlight:: bash
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237
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238 The route can then be accessed as::
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239
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240 $ curl http://localhost:8042/toto
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241 ok
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242
469
46949efa5818 Implementing basic paging using a Python script
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243
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244 .. _python-changes:
345
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245
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246 Listening to changes
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247 ....................
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248
346
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249 .. highlight:: python
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250
345
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251 This sample uploads a DICOM file as soon as Orthanc is started::
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252
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253 import orthanc
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254
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255 def OnChange(changeType, level, resource):
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256 if changeType == orthanc.ChangeType.ORTHANC_STARTED:
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257 print('Started')
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258
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259 with open('/tmp/sample.dcm', 'rb') as f:
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260 orthanc.RestApiPost('/instances', f.read())
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261
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262 elif changeType == orthanc.ChangeType.ORTHANC_STOPPED:
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263 print('Stopped')
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264
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265 elif changeType == orthanc.ChangeType.NEW_INSTANCE:
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266 print('A new instance was uploaded: %s' % resource)
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267
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268 orthanc.RegisterOnChangeCallback(OnChange)
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269
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270
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271 Accessing the content of a new instance
346
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272 .......................................
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273
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274 .. highlight:: python
345
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275
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276 ::
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277
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278 import orthanc
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279 import json
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280 import pprint
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281
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282 def OnStoredInstance(dicom, instanceId):
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283 print('Received instance %s of size %d (transfer syntax %s, SOP class UID %s)' % (
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284 instanceId, dicom.GetInstanceSize(),
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285 dicom.GetInstanceMetadata('TransferSyntax'),
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286 dicom.GetInstanceMetadata('SopClassUid')))
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287
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288 # Print the origin information
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289 if dicom.GetInstanceOrigin() == orthanc.InstanceOrigin.DICOM_PROTOCOL:
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290 print('This instance was received through the DICOM protocol')
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291 elif dicom.GetInstanceOrigin() == orthanc.InstanceOrigin.REST_API:
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292 print('This instance was received through the REST API')
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293
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294 # Print the DICOM tags
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295 pprint.pprint(json.loads(dicom.GetInstanceSimplifiedJson()))
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296
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297 orthanc.RegisterOnStoredInstanceCallback(OnStoredInstance)
346
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298
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299
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300 Calling pydicom
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301 ...............
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302
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303 .. highlight:: python
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304
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305 Here is a sample Python plugin that registers a REST callback to dump
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306 the content of the dataset of one given DICOM instance stored in
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307 Orthanc, using `pydicom <https://pydicom.github.io/>`__::
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308
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309 import io
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310 import orthanc
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311 import pydicom
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312
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313 def DecodeInstance(output, uri, **request):
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314 if request['method'] == 'GET':
347
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315 # Retrieve the instance ID from the regular expression (*)
346
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316 instanceId = request['groups'][0]
347
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317 # Get the content of the DICOM file
346
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318 f = orthanc.GetDicomForInstance(instanceId)
347
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319 # Parse it using pydicom
346
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320 dicom = pydicom.dcmread(io.BytesIO(f))
347
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321 # Return a string representation the dataset to the caller
346
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322 output.AnswerBuffer(str(dicom), 'text/plain')
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323 else:
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324 output.SendMethodNotAllowed('GET')
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325
347
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326 orthanc.RegisterRestCallback('/pydicom/(.*)', DecodeInstance) # (*)
346
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327
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328 .. highlight:: bash
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329
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330 This can be called as follows::
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331
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332 $ curl http://localhost:8042/pydicom/19816330-cb02e1cf-df3a8fe8-bf510623-ccefe9f5
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333
347
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334
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335 Auto-routing studies
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336 ....................
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337
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338 .. highlight:: python
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339
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340 Here is a sample Python plugin that routes any :ref:`stable study
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341 <lua-callbacks>` to a modality named ``samples`` (as declared in the
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342 ``DicomModalities`` configuration option)::
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343
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344 import orthanc
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345
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346 def OnChange(changeType, level, resourceId):
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347 if changeType == orthanc.ChangeType.STABLE_STUDY:
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348 print('Stable study: %s' % resourceId)
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349 orthanc.RestApiPost('/modalities/sample/store', resourceId)
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350
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351 orthanc.RegisterOnChangeCallback(OnChange)
348
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352
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353
352
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354 Rendering a thumbnail using PIL/Pillow
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355 ......................................
348
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356
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357 .. highlight:: python
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358
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359 ::
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360
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361 from PIL import Image
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362 import io
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363 import orthanc
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364
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365 def DecodeInstance(output, uri, **request):
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366 if request['method'] == 'GET':
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367 # Retrieve the instance ID from the regular expression (*)
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368 instanceId = request['groups'][0]
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369
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370 # Render the instance, then open it in Python using PIL/Pillow
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371 png = orthanc.RestApiGet('/instances/%s/rendered' % instanceId)
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372 image = Image.open(io.BytesIO(png))
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373
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374 # Downsize the image as a 64x64 thumbnail
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375 image.thumbnail((64, 64), Image.ANTIALIAS)
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376
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377 # Save the thumbnail as JPEG, then send the buffer to the caller
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378 jpeg = io.BytesIO()
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379 image.save(jpeg, format = "JPEG", quality = 80)
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380 jpeg.seek(0)
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381 output.AnswerBuffer(jpeg.read(), 'text/plain')
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382
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383 else:
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384 output.SendMethodNotAllowed('GET')
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385
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386 orthanc.RegisterRestCallback('/pydicom/(.*)', DecodeInstance) # (*)
351
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387
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388
369
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389 .. _python-introspection:
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390
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391 Inspecting the available API
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392 ............................
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393
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394 .. highlight:: python
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395
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396 Thanks to Python's introspection primitives, it is possible to inspect
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397 the API of the ``orthanc`` module in order to dump all the available
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398 features::
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399
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400 import inspect
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401 import numbers
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402 import orthanc
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403
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404 # Loop over the members of the "orthanc" module
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405 for (name, obj) in inspect.getmembers(orthanc):
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406 if inspect.isroutine(obj):
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407 print('Function %s():\n Documentation: %s\n' % (name, inspect.getdoc(obj)))
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408
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409 elif inspect.isclass(obj):
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410 print('Class %s:\n Documentation: %s' % (name, inspect.getdoc(obj)))
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411
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412 # Loop over the members of the class
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413 for (subname, subobj) in inspect.getmembers(obj):
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414 if isinstance(subobj, numbers.Number):
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415 print(' - Enumeration value %s: %s' % (subname, subobj))
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416 elif (not subname.startswith('_') and
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417 inspect.ismethoddescriptor(subobj)):
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418 print(' - Method %s(): %s' % (subname, inspect.getdoc(subobj)))
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419 print('')
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420
373
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421
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422 .. _python-scheduler:
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423
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424 Scheduling a task for periodic execution
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425 ........................................
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426
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427 .. highlight:: python
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428
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429 The following Python script will periodically (every second) run the
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430 function ``Hello()`` thanks to the ``threading`` module::
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431
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432 import orthanc
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433 import threading
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434
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435 TIMER = None
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436
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437 def Hello():
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438 global TIMER
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439 TIMER = None
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440 orthanc.LogWarning("In Hello()")
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441 # Do stuff...
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442 TIMER = threading.Timer(1, Hello) # Re-schedule after 1 second
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443 TIMER.start()
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444
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diff changeset
445 def OnChange(changeType, level, resource):
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446 if changeType == orthanc.ChangeType.ORTHANC_STARTED:
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447 orthanc.LogWarning("Starting the scheduler")
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448 Hello()
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449
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450 elif changeType == orthanc.ChangeType.ORTHANC_STOPPED:
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451 if TIMER != None:
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452 orthanc.LogWarning("Stopping the scheduler")
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453 TIMER.cancel()
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diff changeset
454
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parents: 369
diff changeset
455 orthanc.RegisterOnChangeCallback(OnChange)
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diff changeset
456
378
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diff changeset
457
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diff changeset
458 .. _python-metadata:
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diff changeset
459
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diff changeset
460 Filtering and returning metadata
16dc3561b41e Filtering and returning metadata using Python
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diff changeset
461 ................................
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462
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diff changeset
463 Besides the main DICOM tags, Orthanc associates some metadata to each
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diff changeset
464 resource it stores (this includes the date of last update, the
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diff changeset
465 transfer syntax, the remote AET...). People are often interested in
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466 getting such metadata while calling the ``/tools/find`` route in the
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467 :ref:`REST API <rest-find>`, or even in filtering this metadata the
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diff changeset
468 same way they look for DICOM tags.
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469
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470 This feature is not built in the core of Orthanc, as metadata is not
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471 indexed in the Orthanc database, contrarily to the main DICOM
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472 tags. Filtering metadata requires a linear search over all the
16dc3561b41e Filtering and returning metadata using Python
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473 matching resources, which induces a cost in the performance.
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diff changeset
474
16dc3561b41e Filtering and returning metadata using Python
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diff changeset
475 .. highlight:: python
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diff changeset
476
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diff changeset
477 Nevertheless, here is a full sample Python script that overwrites the
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478 ``/tools/find`` route in order to give access to metadata::
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479
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480 import json
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481 import orthanc
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482 import re
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483
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484 # Get the path in the REST API to the given resource that was returned
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485 # by a call to "/tools/find"
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486 def GetPath(resource):
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487 if resource['Type'] == 'Patient':
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diff changeset
488 return '/patients/%s' % resource['ID']
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diff changeset
489 elif resource['Type'] == 'Study':
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diff changeset
490 return '/studies/%s' % resource['ID']
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diff changeset
491 elif resource['Type'] == 'Series':
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diff changeset
492 return '/series/%s' % resource['ID']
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diff changeset
493 elif resource['Type'] == 'Instance':
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diff changeset
494 return '/instances/%s' % resource['ID']
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diff changeset
495 else:
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diff changeset
496 raise Exception('Unknown resource level')
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diff changeset
497
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diff changeset
498 def FindWithMetadata(output, uri, **request):
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diff changeset
499 # The "/tools/find" route expects a POST method
16dc3561b41e Filtering and returning metadata using Python
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diff changeset
500 if request['method'] != 'POST':
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diff changeset
501 output.SendMethodNotAllowed('POST')
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diff changeset
502 else:
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parents: 375
diff changeset
503 # Parse the query provided by the user, and backup the "Expand" field
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diff changeset
504 query = json.loads(request['body'])
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diff changeset
505
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Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
506 if 'Expand' in query:
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Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
507 originalExpand = query['Expand']
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diff changeset
508 else:
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diff changeset
509 originalExpand = False
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diff changeset
510
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diff changeset
511 # Call the core "/tools/find" route
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diff changeset
512 query['Expand'] = True
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diff changeset
513 answers = orthanc.RestApiPost('/tools/find', json.dumps(query))
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514
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diff changeset
515 # Loop over the matching resources
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516 filteredAnswers = []
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517 for answer in json.loads(answers):
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518 try:
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519 # Read the metadata that is associated with the resource
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520 metadata = json.loads(orthanc.RestApiGet('%s/metadata?expand' % GetPath(answer)))
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diff changeset
521
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diff changeset
522 # Check whether the metadata matches the regular expressions
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523 # that were provided in the "Metadata" field of the user request
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diff changeset
524 isMetadataMatch = True
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diff changeset
525 if 'Metadata' in query:
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diff changeset
526 for (name, pattern) in query['Metadata'].items():
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diff changeset
527 if name in metadata:
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diff changeset
528 value = metadata[name]
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diff changeset
529 else:
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530 value = ''
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Sebastien Jodogne <s.jodogne@gmail.com>
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531
16dc3561b41e Filtering and returning metadata using Python
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diff changeset
532 if re.match(pattern, value) == None:
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Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
533 isMetadataMatch = False
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Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
534 break
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Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
535
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diff changeset
536 # If all the metadata matches the provided regular
16dc3561b41e Filtering and returning metadata using Python
Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
537 # expressions, add the resource to the filtered answers
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Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
538 if isMetadataMatch:
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parents: 375
diff changeset
539 if originalExpand:
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parents: 375
diff changeset
540 answer['Metadata'] = metadata
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Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
541 filteredAnswers.append(answer)
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diff changeset
542 else:
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Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
543 filteredAnswers.append(answer['ID'])
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Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
544 except:
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parents: 375
diff changeset
545 # The resource was deleted since the call to "/tools/find"
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parents: 375
diff changeset
546 pass
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Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
547
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Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
548 # Return the filtered answers in the JSON format
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diff changeset
549 output.AnswerBuffer(json.dumps(filteredAnswers, indent = 3), 'application/json')
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parents: 375
diff changeset
550
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parents: 375
diff changeset
551 orthanc.RegisterRestCallback('/tools/find', FindWithMetadata)
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parents: 375
diff changeset
552
16dc3561b41e Filtering and returning metadata using Python
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
553
16dc3561b41e Filtering and returning metadata using Python
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parents: 375
diff changeset
554 **Warning:** In the sample above, the filtering of the metadata is
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parents: 375
diff changeset
555 done using Python's `library for regular expressions
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Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
556 <https://docs.python.org/3/library/re.html>`__. It is evidently
16dc3561b41e Filtering and returning metadata using Python
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parents: 375
diff changeset
557 possible to adapt this script in order to use the DICOM conventions
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parents: 375
diff changeset
558 about `attribute matching
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parents: 375
diff changeset
559 <http://dicom.nema.org/medical/dicom/2019e/output/chtml/part04/sect_C.2.2.2.html>`__.
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Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
560
469
46949efa5818 Implementing basic paging using a Python script
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parents: 462
diff changeset
561 .. highlight:: bash
378
16dc3561b41e Filtering and returning metadata using Python
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
562
16dc3561b41e Filtering and returning metadata using Python
Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
563 Here is a sample call to retrieve all the studies that were last
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Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
564 updated in 2019 thanks to this Python script::
16dc3561b41e Filtering and returning metadata using Python
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 375
diff changeset
565
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Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
566 $ curl http://localhost:8042/tools/find -d '{"Level":"Study","Query":{},"Expand":true,"Metadata":{"LastUpdate":"^2019.*$"}}'
369
181b02cea7ab inspecting Python API
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parents: 364
diff changeset
567
181b02cea7ab inspecting Python API
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parents: 364
diff changeset
568
469
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
569 .. _python-paging:
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
570
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
571 Implementing basic paging
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
572 .........................
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
573
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
574 .. highlight:: python
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
575
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
576 As explained in the FAQ, the :ref:`Orthanc Explorer interface is
46949efa5818 Implementing basic paging using a Python script
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parents: 462
diff changeset
577 low-level <improving-interface>`, and is not adapted for
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
578 end-users. One common need is to implement paging of studies, which
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
579 calls for server-side sorting of studies. This can be done using the
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
580 following sample Python plugin that registers a new route
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
581 ``/sort-studies`` in the REST API of Orthanc::
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
582
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
583 import json
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
584 import orthanc
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
585
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
586 def GetStudyDate(study):
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
587 if 'StudyDate' in study['MainDicomTags']:
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
588 return study['MainDicomTags']['StudyDate']
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
589 else:
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
590 return ''
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
591
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
592 def SortStudiesByDate(output, uri, **request):
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
593 if request['method'] == 'GET':
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
594 # Retrieve all the studies
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
595 studies = json.loads(orthanc.RestApiGet('/studies?expand'))
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
596
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
597 # Sort the studies according to the "StudyDate" DICOM tag
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
598 studies = sorted(studies, key = GetStudyDate)
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
599
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
600 # Read the limit/offset arguments provided by the user
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
601 offset = 0
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
602 if 'offset' in request['get']:
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
603 offset = int(request['get']['offset'])
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
604
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
605 limit = 0
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
606 if 'limit' in request['get']:
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
607 limit = int(request['get']['limit'])
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
608
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
609 # Truncate the list of studies
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
610 if limit == 0:
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
611 studies = studies[offset : ]
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
612 else:
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
613 studies = studies[offset : offset + limit]
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
614
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
615 # Return the truncated list of studies
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
616 output.AnswerBuffer(json.dumps(studies), 'application/json')
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
617 else:
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
618 output.SendMethodNotAllowed('GET')
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
619
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
620 orthanc.RegisterRestCallback('/sort-studies', SortStudiesByDate)
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
621
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
622
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
623 .. highlight:: bash
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
624
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
625 Here is a sample call to this new REST route, that could be issued by
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
626 any JavaScript framework (the ``json_pp`` command-line pretty-prints a
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
627 JSON file)::
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
628
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
629 $ curl http://localhost:8042/sort-studies | json_pp
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
630
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
631 This route also implement paging (i.e. it can limit and offset the
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
632 returned studies)::
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
633
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
634 $ curl 'http://localhost:8042/sort-studies?offset=2&limit=2' | json_pp
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
635
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
636 Obviously, this basic sample can be improved in many ways. To improve
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
637 performance, one could for instance cache the result of
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
638 ``/studies?expand`` in memory by :ref:`listening to changes
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
639 <python-changes>` in the list of studies
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
640 (cf. ``orthanc.ChangeType.NEW_STUDY`` and
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
641 ``orthanc.ChangeType.DELETED``).
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
642
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
643
46949efa5818 Implementing basic paging using a Python script
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
644
351
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
645 Performance and concurrency
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
646 ---------------------------
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
647
471
a735476a0e6e note about fork on windows
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
648 **Important:** This section only applies to UNIX-like systems. The
a735476a0e6e note about fork on windows
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
649 ``multiprocessing`` package will not work on Microsoft Windows as the
a735476a0e6e note about fork on windows
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
650 latter OS has a different model for `forking processes
a735476a0e6e note about fork on windows
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
651 <https://en.wikipedia.org/wiki/Fork_(system_call)>`__.
a735476a0e6e note about fork on windows
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 462
diff changeset
652
351
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
653 .. highlight:: python
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
654
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
655 Let us consider the following sample Python script that makes a
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
656 CPU-intensive computation on a REST callback::
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
657
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
658 import math
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
659 import orthanc
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
660 import time
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
661
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
662 # CPU-intensive computation taking about 4 seconds
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
663 def SlowComputation():
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
664 start = time.time()
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
665 for i in range(1000):
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
666 for j in range(30000):
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
667 math.sqrt(float(j))
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
668 end = time.time()
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
669 duration = (end - start)
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
670 return 'computation done in %.03f seconds\n' % duration
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
671
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
672 def OnRest(output, uri, **request):
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
673 answer = SlowComputation()
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
674 output.AnswerBuffer(answer, 'text/plain')
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
675
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
676 orthanc.RegisterRestCallback('/computation', OnRest)
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
677
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
678
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
679 .. highlight:: text
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
680
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
681 Calling this REST route from the command-line returns the time that is
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
682 needed to compute 30 million times a squared root on your CPU::
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
683
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
684 $ curl http://localhost:8042/computation
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
685 computation done in 4.208 seconds
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
686
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
687 Now, let us call this route three times concurrently (we use bash)::
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
688
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
689 $ (curl http://localhost:8042/computation & curl http://localhost:8042/computation & curl http://localhost:8042/computation )
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
690 computation done in 11.262 seconds
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
691 computation done in 12.457 seconds
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
692 computation done in 13.360 seconds
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
693
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
694 As can be seen, the computation time has tripled. This means that the
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
695 computations were not distributed across the available CPU cores.
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
696 This might seem surprising, as Orthanc is a threaded server (in
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
697 Orthanc, a pool of C++ threads serves concurrent requests).
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
698
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
699 The explanation is that the Python interpreter (`CPython
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
700 <https://en.wikipedia.org/wiki/CPython>`__ actually) is built on the
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
701 top of a so-called `Global Interpreter Lock (GIL)
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
702 <https://en.wikipedia.org/wiki/Global_interpreter_lock>`__. The GIL is
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
703 basically a mutex that protects all the calls to the Python
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
704 interpreter. If multiple C++ threads from Orthanc call a Python
353
0122c668f4ec python licensing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 352
diff changeset
705 callback, only one can proceed at any given time. Note however that
0122c668f4ec python licensing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 352
diff changeset
706 the GIL only applies to the Python script: The baseline REST API of
0122c668f4ec python licensing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 352
diff changeset
707 Orthanc is not affected by the GIL.
351
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
708
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
709 .. highlight:: python
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
710
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
711 The solution is to use the `multiprocessing primitives
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
712 <https://docs.python.org/3/library/multiprocessing.html>`__ of Python.
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
713 The "master" Python interpreter that is initially started by the
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
714 Orthanc plugin, can start several `children processes
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
715 <https://en.wikipedia.org/wiki/Process_(computing)>`__, each of these
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
716 processes running a separate Python interpreter. This allows to
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 350
diff changeset
717 offload intensive computations from the "master" Python interpreter of
e2863083fa30 multiprocessing
Sebastien Jodogne <s.jodogne@gmail.com>
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718 Orthanc onto those "slave" interpreters. The ``multiprocessing``
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719 library is actually quite straightforward to use::
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720
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721 import math
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722 import multiprocessing
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723 import orthanc
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724 import signal
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725 import time
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726
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727 # CPU-intensive computation taking about 4 seconds
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728 # (same code as above)
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729 def SlowComputation():
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730 start = time.time()
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731 for i in range(1000):
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732 for j in range(30000):
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733 math.sqrt(float(j))
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734 end = time.time()
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735 duration = (end - start)
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736 return 'computation done in %.03f seconds\n' % duration
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737
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738 # Ignore CTRL+C in the slave processes
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739 def Initializer():
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740 signal.signal(signal.SIGINT, signal.SIG_IGN)
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741
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742 # Create a pool of 4 slave Python interpreters
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743 POOL = multiprocessing.Pool(4, initializer = Initializer)
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744
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745 def OnRest(output, uri, **request):
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746 # Offload the call to "SlowComputation" onto one slave process.
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747 # The GIL is unlocked until the slave sends its answer back.
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748 answer = POOL.apply(SlowComputation)
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749 output.AnswerBuffer(answer, 'text/plain')
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750
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751 orthanc.RegisterRestCallback('/computation', OnRest)
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752
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753 .. highlight:: text
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754
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755 Here is now the result of calling this route three times concurrently::
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756
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757 $ (curl http://localhost:8042/computation & curl http://localhost:8042/computation & curl http://localhost:8042/computation )
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758 computation done in 4.211 seconds
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759 computation done in 4.215 seconds
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760 computation done in 4.225 seconds
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761
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762 As can be seen, the calls to the Python computation now fully run in
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763 parallel (the time is cut down from 12 seconds to 4 seconds, the same
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764 as for one isolated request).
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765
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766 Note also how the ``multiprocessing`` library allows to make a fine
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767 control over the computational resources that are available to the
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768 Python script: The number of "slave" interpreters can be easily
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769 changed in the constructor of the ``multiprocessing.Pool`` object, and
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770 are fully independent of the threads used by the Orthanc server.
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771
352
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772 .. highlight:: python
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773
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774 Very importantly, pay attention to the fact that only the "master"
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775 Python interpreter has access to the Orthanc SDK. For instance, here
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776 is how you would parse a DICOM file in a slave process::
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777
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778 import pydicom
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779 import io
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780
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781 def OffloadedDicomParsing(dicom):
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782 # No access to the "orthanc" library here, as we are in the slave process
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783 dataset = pydicom.dcmread(io.BytesIO(dicom))
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784 return str(dataset)
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785
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786 def OnRest(output, uri, **request):
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787 # The call to "orthanc.RestApiGet()" is only possible in the master process
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788 dicom = orthanc.RestApiGet('/instances/19816330-cb02e1cf-df3a8fe8-bf510623-ccefe9f5/file')
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789 answer = POOL.apply(OffloadedDicomParsing, args = (dicom, ))
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790 output.AnswerBuffer(answer, 'text/plain')
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791
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792 Communication primitives such as ``multiprocessing.Queue`` are
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793 available to exchange messages from the "slave" Python interpreters to
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794 the "master" Python interpreter if further calls to the Orthanc SDK
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795 are required.
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796
351
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797 Obviously, an in-depth discussion about the ``multiprocessing``
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798 library is out of the scope of this document. There are many
375
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799 references available on Internet. Also, note that ``threading`` is not
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800 useful here, as Python multithreading is also limited by the GIL, and
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801 is more targeted at dealing with costly I/O operations or with the
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802 :ref:`scheduling of commands <python-scheduler>`.