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added new features from next upcoming Orthanc release
author Alain Mazy <am@osimis.io>
date Tue, 03 May 2022 15:09:54 +0200
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1 .. _housekeeper-plugin:
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2
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3
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4 Housekeeper plugin (not released yet)
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5 =========================
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6
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7 This page describes the **official sample plugin** that performs
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8 housekeeping in the Database and Storage.
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9
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10 When changing some configuration or when upgrading Orthanc, it
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11 might be usefull to perform housekeeping operations to optmize
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12 the DB or clean/compress/uncompress the storage. This can happen e.g:
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13
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14 * when changing the list of indexed :ref:`MainDicomTags <_main-dicom-tags>`
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15 * when changing the ``StorageCompression`` configuration
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16 * when changing the ``IngestTranscoding`` configuration
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17 * to remove unnecessary attachments like the ``dicom-as-json`` that were
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18 used in Orthanc prior to 1.9.1.
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19
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20 Note that these housekeeping operations are not mandatory. Orthanc will
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21 continue to work without these cleanups. However, running the plugin
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22 might improve performances and storage usage.
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23
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24 The plugin detects any configuration changes that can trigger a cleanup
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25 and will start process the studies one by one (in the order they have
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26 been ingested in Orthanc). If Orthanc is stopped and restarted, the plugin
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27 will resume where it stopped.
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28
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29
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30 Configuration
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31 -------------
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32
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33 .. highlight:: json
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34
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35 Here's a sample configuration section for this plugin with its default values::
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36
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37 {
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38 "Housekeeper": {
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39
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40 // Enables/disables the plugin
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41 "Enable": false,
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42
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43 // the Global Prooperty ID in which the plugin progress
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44 // is stored. Must be > 1024 and must not be used by
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45 // another plugin
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46 "GlobalPropertyId": 1025,
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47
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48 // Forces execution even if the plugin did not detect
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49 // any changes in configuration
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50 "Force": false,
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51
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52 // Delay (in seconds) between reconstruction of 2 studies
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53 // This avoids overloading Orthanc with the housekeeping
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54 // process and leaves room for other operations.
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55 "ThrottleDelay": 5,
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56
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57 // Runs the plugin only at certain period of time.
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58 // If not specified, the plugin runs all the time
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59 // Examples:
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60 // to run between 0AM and 6AM everyday + every night
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61 // from 8PM to 12PM and 24h a day on the weekend:
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62 // "Schedule": {
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63 // "Monday": ["0-6", "20-24"],
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64 // "Tuesday": ["0-6", "20-24"],
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65 // "Wednesday": ["0-6", "20-24"],
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66 // "Thursday": ["0-6", "20-24"],
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67 // "Friday": ["0-6", "20-24"],
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68 // "Saturday": ["0-24"],
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69 // "Sunday": ["0-24"]
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70 // },
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71
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72 // configure events that can trigger a housekeeping processing
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73 "Triggers" : {
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74 "StorageCompressionChange": true,
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75 "MainDicomTagsChange": true,
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76 "UnnecessaryDicomAsJsonFiles": true,
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77 "IngestTranscodingChange": true
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78 }
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79 }
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80 }
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81
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82 Scheduling/throttling
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83 ---------------------
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84
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85 Processing a whole database/storage might take a very long time (days, weeks
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86 or even months) and can be I/O & CPU intensive. Therefore, the configuration offers
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87 options to schedule and/or throttle the housekeeping operations. E.g, you can
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88 run only the plugin during the night and week-end and, you can introduce a delay
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89 between each processed study.
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90
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91 Triggers & internals
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92 --------------------
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93
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94 By default, all triggers are enabled. Depending on the detected change,
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95 various operations will happen:
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96
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97 * if ``MainDicomTagsChange`` or ``UnnecessaryDicomAsJsonFiles`` is triggered,
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98 the plugin will call the ``/studies/.../reconstruct`` route on every study
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99 one by one. Orthanc will read the DICOM tags from the DICOM files again and update
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100 their value in the DB.
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101
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102 * if any other change is detected, the plugin will again call the ``reconstruct`` route
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103 but, this time, with the ``ReconstructFiles`` option enabled. Orthanc will then,
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104 read the DICOM file from the storage, compress/uncompress/transcode it and it will
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105 save it again to disk. The new file will be stored using the new Storage settings
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106 (``StorageCompression`` and ``IngestTranscoding``).
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107 Note that, Orthanc will create a new ``Attachment`` that will be saved at a different
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108 place as the previous one.
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109
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110
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111 Status
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112 ------
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113
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114 You can get a progress status of the plugin by calling the ``/housekeeper/status`` API route.
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115
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116
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117 Compilation
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118 -----------
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119
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120 This plugin is part of the Orthanc core repository and is included in the Orthanc makefile.
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121 It is compiled with Orthanc itself and is distributed together with Orthanc binaries.
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122
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124