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author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 27 Mar 2020 11:24:19 +0100
parents bdf8757449e3
children d8359cecdc89
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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 The Python API is automatically generated from the `Orthanc plugin SDK
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12 in C
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13 <https://hg.orthanc-server.com/orthanc/file/Orthanc-1.5.7/Plugins/Include/orthanc/OrthancCPlugin.h>`__
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14 using the `Clang <https://en.wikipedia.org/wiki/Clang>`__ compiler
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15 front-end. The coverage of the C SDK is about 75% (105 functions are
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16 automatically wrapped in Python out of a total of 139 functions in C).
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18
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19 Samples
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20 -------
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21
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22 Extending the REST API
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23 ......................
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24
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25 .. highlight:: python
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26
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27 Here is a basic Python script that registers two new routes in the
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28 REST API::
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29
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30 import orthanc
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31 import pprint
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32
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33 def OnRest(output, uri, **request):
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34 pprint.pprint(request)
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35 print('Accessing uri: %s' % uri)
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36 output.AnswerBuffer('ok\n', 'text/plain')
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37
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38 orthanc.RegisterRestCallback('/(to)(t)o', OnRest)
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39 orthanc.RegisterRestCallback('/tata', OnRest)
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40
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41 .. highlight:: json
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42
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43 Here is the associated minimal configuration file for Orthanc
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44 (provided the Python script is saved as ``rest.py``)::
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45
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46 {
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47 "Plugins" : [ "." ],
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48 "PythonScript" : "rest.py",
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49 "PythonVerbose" : false
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50 }
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51
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52 .. highlight:: bash
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53
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54 The route can then be accessed as::
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55
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56 $ curl http://localhost:8042/toto
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57 ok
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58
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59
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60 Listening to changes
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61 ....................
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62
346
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63 .. highlight:: python
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64
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65 This sample uploads a DICOM file as soon as Orthanc is started::
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66
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67 import orthanc
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68
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69 def OnChange(changeType, level, resource):
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70 if changeType == orthanc.ChangeType.ORTHANC_STARTED:
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71 print('Started')
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72
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73 with open('/tmp/sample.dcm', 'rb') as f:
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74 orthanc.RestApiPost('/instances', f.read())
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75
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76 elif changeType == orthanc.ChangeType.ORTHANC_STOPPED:
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77 print('Stopped')
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78
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79 elif changeType == orthanc.ChangeType.NEW_INSTANCE:
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80 print('A new instance was uploaded: %s' % resource)
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81
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82 orthanc.RegisterOnChangeCallback(OnChange)
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83
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84
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85 Accessing the content of a new instance
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86 .......................................
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87
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88 .. highlight:: python
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89
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90 ::
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91
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92 import orthanc
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93 import json
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94 import pprint
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95
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96 def OnStoredInstance(dicom, instanceId):
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97 print('Received instance %s of size %d (transfer syntax %s, SOP class UID %s)' % (
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98 instanceId, dicom.GetInstanceSize(),
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99 dicom.GetInstanceMetadata('TransferSyntax'),
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100 dicom.GetInstanceMetadata('SopClassUid')))
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101
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102 # Print the origin information
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103 if dicom.GetInstanceOrigin() == orthanc.InstanceOrigin.DICOM_PROTOCOL:
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104 print('This instance was received through the DICOM protocol')
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105 elif dicom.GetInstanceOrigin() == orthanc.InstanceOrigin.REST_API:
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106 print('This instance was received through the REST API')
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107
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108 # Print the DICOM tags
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109 pprint.pprint(json.loads(dicom.GetInstanceSimplifiedJson()))
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110
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111 orthanc.RegisterOnStoredInstanceCallback(OnStoredInstance)
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112
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113
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114 Calling pydicom
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115 ...............
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116
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117 .. highlight:: python
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118
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119 Here is a sample Python plugin that registers a REST callback to dump
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120 the content of the dataset of one given DICOM instance stored in
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121 Orthanc, using `pydicom <https://pydicom.github.io/>`__::
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122
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123 import io
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124 import orthanc
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125 import pydicom
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126
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127 def DecodeInstance(output, uri, **request):
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128 if request['method'] == 'GET':
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129 # Retrieve the instance ID from the regular expression (*)
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130 instanceId = request['groups'][0]
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131 # Get the content of the DICOM file
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132 f = orthanc.GetDicomForInstance(instanceId)
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133 # Parse it using pydicom
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134 dicom = pydicom.dcmread(io.BytesIO(f))
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135 # Return a string representation the dataset to the caller
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136 output.AnswerBuffer(str(dicom), 'text/plain')
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137 else:
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138 output.SendMethodNotAllowed('GET')
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139
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140 orthanc.RegisterRestCallback('/pydicom/(.*)', DecodeInstance) # (*)
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141
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142 .. highlight:: bash
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143
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144 This can be called as follows::
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145
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146 $ curl http://localhost:8042/pydicom/19816330-cb02e1cf-df3a8fe8-bf510623-ccefe9f5
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147
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148
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149 Auto-routing studies
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150 ....................
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151
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152 .. highlight:: python
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153
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154 Here is a sample Python plugin that routes any :ref:`stable study
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155 <lua-callbacks>` to a modality named ``samples`` (as declared in the
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156 ``DicomModalities`` configuration option)::
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157
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158 import orthanc
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159
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160 def OnChange(changeType, level, resourceId):
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161 if changeType == orthanc.ChangeType.STABLE_STUDY:
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162 print('Stable study: %s' % resourceId)
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163 orthanc.RestApiPost('/modalities/sample/store', resourceId)
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164
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165 orthanc.RegisterOnChangeCallback(OnChange)