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annotate Resources/Samples/Python/ChangesLoop.py @ 1753:faf2ecab3472 db-changes

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 27 Oct 2015 20:31:34 +0100
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1 #!/usr/bin/python
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3 # Orthanc - A Lightweight, RESTful DICOM Store
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4 # Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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5 # Department, University Hospital of Liege, Belgium
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6 #
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7 # This program is free software: you can redistribute it and/or
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8 # modify it under the terms of the GNU General Public License as
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9 # published by the Free Software Foundation, either version 3 of the
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10 # License, or (at your option) any later version.
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11 #
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12 # This program is distributed in the hope that it will be useful, but
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13 # WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 # General Public License for more details.
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16 #
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17 # You should have received a copy of the GNU General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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22 import time
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23 import sys
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24 import RestToolbox
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27 ##
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28 ## Print help message
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29 ##
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30
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31 if len(sys.argv) != 3:
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32 print("""
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33 Sample script that continuously monitors the arrival of new DICOM
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34 images into Orthanc (through the Changes API).
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35
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36 Usage: %s [hostname] [HTTP port]
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37 For instance: %s localhost 8042
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38 """ % (sys.argv[0], sys.argv[0]))
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39 exit(-1)
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41 URL = 'http://%s:%d' % (sys.argv[1], int(sys.argv[2]))
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45 ##
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46 ## The following function is called each time a new instance is
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47 ## received.
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48 ##
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50 def NewInstanceReceived(path):
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51 global URL
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52 patientName = RestToolbox.DoGet(URL + path + '/content/PatientName')
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53
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54 # Remove the possible trailing characters due to DICOM padding
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55 patientName = patientName.strip()
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56
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57 print('New instance received for patient "%s": "%s"' % (patientName, path))
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61 ##
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62 ## Main loop that listens to the changes API.
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63 ##
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65 current = 0
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66 while True:
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67 r = RestToolbox.DoGet(URL + '/changes', {
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68 'since' : current,
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69 'limit' : 4 # Retrieve at most 4 changes at once
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70 })
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72 for change in r['Changes']:
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73 # We are only interested interested in the arrival of new instances
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74 if change['ChangeType'] == 'NewInstance':
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75 # Call the callback function
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76 path = change['Path']
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77 NewInstanceReceived(path)
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79 # Delete the instance once it has been discovered
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80 RestToolbox.DoDelete(URL + path)
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82 current = r['Last']
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84 if r['Done']:
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85 print('Everything has been processed: Waiting...')
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86 time.sleep(1)