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annotate Sphinx/source/plugins/python.rst @ 350:c238865e7538

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 27 Mar 2020 18:25:17 +0100
parents 60080d792f25
children e2863083fa30
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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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8
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9 Work-in-progress.
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10
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11 Being a plugin, the Python API has access to more features than
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12 :ref:`Lua scripts <lua>`.
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13
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14 The Python API is automatically generated from the `Orthanc plugin SDK
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15 in C
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16 <https://hg.orthanc-server.com/orthanc/file/Orthanc-1.5.7/Plugins/Include/orthanc/OrthancCPlugin.h>`__
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17 using the `Clang <https://en.wikipedia.org/wiki/Clang>`__ compiler
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18 front-end. The coverage of the C SDK is about 75% (105 functions are
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19 automatically wrapped in Python out of a total of 139 functions in C).
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20
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21
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22 Samples
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23 -------
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24
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25 Extending the REST API
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26 ......................
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27
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28 .. highlight:: python
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29
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30 Here is a basic Python script that registers two new routes in the
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31 REST API::
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32
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33 import orthanc
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34 import pprint
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35
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36 def OnRest(output, uri, **request):
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37 pprint.pprint(request)
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38 print('Accessing uri: %s' % uri)
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39 output.AnswerBuffer('ok\n', 'text/plain')
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40
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41 orthanc.RegisterRestCallback('/(to)(t)o', OnRest)
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42 orthanc.RegisterRestCallback('/tata', OnRest)
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43
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44 .. highlight:: json
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45
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46 Here is the associated minimal configuration file for Orthanc
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47 (provided the Python script is saved as ``rest.py``)::
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48
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49 {
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50 "Plugins" : [ "." ],
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51 "PythonScript" : "rest.py",
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52 "PythonVerbose" : false
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53 }
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54
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55 .. highlight:: bash
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56
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57 The route can then be accessed as::
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58
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59 $ curl http://localhost:8042/toto
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60 ok
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61
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62
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63 Listening to changes
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64 ....................
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65
346
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66 .. highlight:: python
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67
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68 This sample uploads a DICOM file as soon as Orthanc is started::
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69
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70 import orthanc
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71
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72 def OnChange(changeType, level, resource):
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73 if changeType == orthanc.ChangeType.ORTHANC_STARTED:
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74 print('Started')
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75
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76 with open('/tmp/sample.dcm', 'rb') as f:
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77 orthanc.RestApiPost('/instances', f.read())
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78
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79 elif changeType == orthanc.ChangeType.ORTHANC_STOPPED:
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80 print('Stopped')
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81
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82 elif changeType == orthanc.ChangeType.NEW_INSTANCE:
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83 print('A new instance was uploaded: %s' % resource)
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84
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85 orthanc.RegisterOnChangeCallback(OnChange)
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86
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87
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88 Accessing the content of a new instance
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89 .......................................
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90
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91 .. highlight:: python
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92
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93 ::
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94
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95 import orthanc
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96 import json
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97 import pprint
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98
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99 def OnStoredInstance(dicom, instanceId):
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100 print('Received instance %s of size %d (transfer syntax %s, SOP class UID %s)' % (
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101 instanceId, dicom.GetInstanceSize(),
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102 dicom.GetInstanceMetadata('TransferSyntax'),
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103 dicom.GetInstanceMetadata('SopClassUid')))
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104
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105 # Print the origin information
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106 if dicom.GetInstanceOrigin() == orthanc.InstanceOrigin.DICOM_PROTOCOL:
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107 print('This instance was received through the DICOM protocol')
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108 elif dicom.GetInstanceOrigin() == orthanc.InstanceOrigin.REST_API:
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109 print('This instance was received through the REST API')
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110
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111 # Print the DICOM tags
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112 pprint.pprint(json.loads(dicom.GetInstanceSimplifiedJson()))
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113
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114 orthanc.RegisterOnStoredInstanceCallback(OnStoredInstance)
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115
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116
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117 Calling pydicom
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118 ...............
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119
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120 .. highlight:: python
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121
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122 Here is a sample Python plugin that registers a REST callback to dump
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123 the content of the dataset of one given DICOM instance stored in
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124 Orthanc, using `pydicom <https://pydicom.github.io/>`__::
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125
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126 import io
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127 import orthanc
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128 import pydicom
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129
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130 def DecodeInstance(output, uri, **request):
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131 if request['method'] == 'GET':
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132 # Retrieve the instance ID from the regular expression (*)
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133 instanceId = request['groups'][0]
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134 # Get the content of the DICOM file
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135 f = orthanc.GetDicomForInstance(instanceId)
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136 # Parse it using pydicom
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137 dicom = pydicom.dcmread(io.BytesIO(f))
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138 # Return a string representation the dataset to the caller
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139 output.AnswerBuffer(str(dicom), 'text/plain')
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140 else:
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141 output.SendMethodNotAllowed('GET')
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142
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143 orthanc.RegisterRestCallback('/pydicom/(.*)', DecodeInstance) # (*)
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144
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145 .. highlight:: bash
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146
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147 This can be called as follows::
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148
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149 $ curl http://localhost:8042/pydicom/19816330-cb02e1cf-df3a8fe8-bf510623-ccefe9f5
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150
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151
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152 Auto-routing studies
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153 ....................
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154
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155 .. highlight:: python
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156
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157 Here is a sample Python plugin that routes any :ref:`stable study
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158 <lua-callbacks>` to a modality named ``samples`` (as declared in the
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159 ``DicomModalities`` configuration option)::
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160
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161 import orthanc
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162
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163 def OnChange(changeType, level, resourceId):
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164 if changeType == orthanc.ChangeType.STABLE_STUDY:
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165 print('Stable study: %s' % resourceId)
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166 orthanc.RestApiPost('/modalities/sample/store', resourceId)
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167
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168 orthanc.RegisterOnChangeCallback(OnChange)
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169
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170
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171 Render a thumbnail using PIL/Pillow
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172 ...................................
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173
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174 .. highlight:: python
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175
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176 ::
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177
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178 from PIL import Image
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179 import io
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180 import orthanc
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181
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182 def DecodeInstance(output, uri, **request):
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183 if request['method'] == 'GET':
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184 # Retrieve the instance ID from the regular expression (*)
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185 instanceId = request['groups'][0]
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186
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187 # Render the instance, then open it in Python using PIL/Pillow
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188 png = orthanc.RestApiGet('/instances/%s/rendered' % instanceId)
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189 image = Image.open(io.BytesIO(png))
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190
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191 # Downsize the image as a 64x64 thumbnail
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192 image.thumbnail((64, 64), Image.ANTIALIAS)
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193
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194 # Save the thumbnail as JPEG, then send the buffer to the caller
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195 jpeg = io.BytesIO()
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196 image.save(jpeg, format = "JPEG", quality = 80)
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197 jpeg.seek(0)
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198 output.AnswerBuffer(jpeg.read(), 'text/plain')
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199
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200 else:
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201 output.SendMethodNotAllowed('GET')
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202
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203 orthanc.RegisterRestCallback('/pydicom/(.*)', DecodeInstance) # (*)