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annotate Sphinx/source/users/lua.rst @ 358:011b01ccf52d
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Mon, 30 Mar 2020 18:47:35 +0200 |
| parents | 6b432ce3a56e |
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| 0 | 1 .. _lua: |
| 2 | |
| 3 Server-side scripting with Lua | |
| 4 ============================== | |
| 5 | |
| 6 .. contents:: | |
| 7 | |
| 8 Since release 0.5.2, Orthanc supports server-side scripting through | |
| 25 | 9 the `Lua <https://en.wikipedia.org/wiki/Lua_(programming_language)>`__ |
| 0 | 10 scripting language. Thanks to this major feature, Orthanc can be tuned |
| 11 to specific medical workflows without being driven by an external | |
| 12 script. This page summarizes the possibilities of Orthanc server-side | |
| 13 scripting. | |
| 14 | |
| 15 Many other examples are `available in the source distribution | |
| 16 <https://bitbucket.org/sjodogne/orthanc/src/default/Resources/Samples/Lua/>`__. | |
| 17 | |
| 18 | |
| 75 | 19 Installing a Lua script |
| 0 | 20 ----------------------- |
| 21 | |
| 22 .. highlight:: bash | |
| 23 | |
| 24 A custom Lua script can be installed either by the :ref:`configuration | |
| 25 file <configuration>`, or by uploading it | |
| 26 through the :ref:`REST API <rest-samples>`. | |
| 27 | |
| 28 To install it by the **configuration file** method, you just have to | |
| 29 specify the path to the file containing the Lua script in the | |
| 357 | 30 ``LuaScripts`` variable. A comma-separated list of paths can be |
| 31 specified to install multiple scripts. | |
| 0 | 32 |
| 33 To upload a script stored in the file "``script.lua``" through the | |
| 34 **REST API**, use the following command:: | |
| 35 | |
| 36 $ curl -X POST http://localhost:8042/tools/execute-script --data-binary @script.lua | |
| 37 | |
| 38 Pay attention to the fact that, contrarily to the scripts installed | |
| 39 from the configuration file, the scripts installed through the REST | |
| 40 API are non-persistent: They are discarded after a restart of Orthanc, | |
| 41 which makes them useful for script prototyping. You can also interpret | |
| 42 a single Lua command through the REST API:: | |
| 43 | |
| 44 $ curl -X POST http://localhost:8042/tools/execute-script --data-binary "print(42)" | |
| 45 | |
| 46 *Note:* The ``--data-binary`` cURL option is used instead of | |
| 47 ``--data`` to prevent the interpretation of newlines by cURL, which is | |
| 48 `mandatory for the proper evaluation | |
|
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49 <https://stackoverflow.com/questions/3872427/how-to-send-line-break-with-curl>`__ |
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50 of the possible comments inside the Lua script. |
| 0 | 51 |
| 52 Lua API | |
| 53 ------- | |
| 54 | |
| 55 | |
| 56 .. _lua-callbacks: | |
| 57 | |
| 58 Callbacks to react to events | |
| 59 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| 60 | |
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61 The Lua engine of Orthanc invokes the following callbacks that |
| 0 | 62 are triggered on various events. Here are the **generic events**: |
| 63 | |
| 64 * ``function Initialize()``: Invoked as soon as the Orthanc server is started. | |
| 65 * ``function Finalize()``: Invoked just before the Orthanc server is stopped. | |
| 66 | |
| 67 Some **permission-related events** allow to filter incoming requests: | |
| 68 | |
| 69 * ``function ReceivedInstanceFilter(dicom, origin)``: | |
| 70 Invoked to known whether an incoming DICOM instance should be | |
| 71 accepted. :ref:`See this section <lua-filter-dicom>`. The ``origin`` | |
| 72 parameter is :ref:`documented separately <lua-origin>`. | |
| 73 * ``function IncomingHttpRequestFilter(method, uri, ip, username, | |
| 74 httpHeaders)``: Invoked to known whether a REST request should be | |
| 75 accepted. :ref:`See this section <lua-filter-rest>`. | |
| 76 | |
| 232 | 77 Some **job-related events** allow to react to :ref:`job <jobs>` completion/failure: |
| 78 | |
| 79 * ``function OnJobSubmitted(jobId)``: | |
| 80 Invoked when a new job has been submitted. Note that this does not | |
| 81 mean the the job execution has started. | |
| 82 * ``function OnJobFailure(jobId)``: | |
| 83 Invoked when a job has failed. | |
| 84 * ``function OnJobSuccess(jobId)``: | |
| 85 Invoked when a job has completed successfully. | |
| 86 | |
| 0 | 87 Some **DICOM-related events** allow to react to the reception of |
| 88 new medical images: | |
| 89 | |
| 90 * ``function OnStoredInstance(instanceId, tags, metadata, origin)``: | |
| 91 Invoked whenever a new instance has been stored into Orthanc. | |
| 92 This is especially useful for :ref:`lua-auto-routing`. The ``origin`` | |
| 93 parameter is :ref:`documented separately <lua-origin>`. | |
| 94 * ``function OnStablePatient(patientId, tags, metadata)``: Invoked | |
| 95 whenever a patient has not received any new instance for a certain | |
| 96 amount of time (cf. the option ``StableAge`` in the | |
| 97 :ref:`configuration file <configuration>`). The :ref:`identifier | |
| 98 <orthanc-ids>` of the patient is provided, together with her DICOM | |
| 78 | 99 tags and her :ref:`metadata <metadata>`. |
| 0 | 100 * ``function OnStableSeries(seriesId, tags, metadata)``: Invoked |
| 101 whenever a series has not received any new instance for a certain | |
| 102 amount of time. | |
| 103 * ``function OnStableStudy(studyId, tags, metadata)``: Invoked | |
| 104 whenever a study has not received any new instance for a certain | |
| 105 amount of time. | |
| 106 * ``function IncomingFindRequestFilter(source, origin)``: Invoked | |
| 107 whenever Orthanc receives an incoming C-Find query through the DICOM | |
| 108 protocol. This allows to inspect the content of the C-Find query, | |
| 109 and possibly modify it if a patch is needed for some manufacturer. A | |
| 110 `sample script is available | |
| 111 <https://bitbucket.org/sjodogne/orthanc/src/default/Resources/Samples/Lua/IncomingFindRequestFilter.lua>`__. | |
| 112 | |
|
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113 Some other **resource-related events** are available: |
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114 |
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115 * ``function OnDeletedPatient(patientId)``: Invoked when a patient has |
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116 been removed from the Orthanc database (new in Orthanc 1.6.0). |
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117 * ``function OnDeletedStudy(studyId)``: Invoked when a study has been |
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118 removed from the Orthanc database (new in Orthanc 1.6.0). |
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119 * ``function OnDeletedSeries(seriesId)``: Invoked when a series has |
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120 been removed from the Orthanc database (new in Orthanc 1.6.0). |
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121 * ``function OnDeletedInstance(instanceId)``: Invoked when a instance |
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122 has been removed from the Orthanc database (new in Orthanc 1.6.0). |
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123 * ``function OnUpdatedPatient(patientId)``: Invoked when some metadata |
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124 or some attachment associated with the given patient has been |
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125 updated (new in Orthanc 1.6.0). |
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126 * ``function OnUpdatedStudy(studyId)``: Invoked when some metadata or |
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127 some attachment associated with the given study has been updated |
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128 (new in Orthanc 1.6.0). |
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129 * ``function OnUpdatedSeries(seriesId)``: Invoked when some metadata |
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130 or some attachment associated with the given series has been updated |
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131 (new in Orthanc 1.6.0). |
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132 * ``function OnUpdatedInstance(instanceId)``: Invoked when some |
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133 metadata or some attachment associated with the given instance has |
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134 been updated (new in Orthanc 1.6.0). |
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135 |
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136 Furthermore, whenever a DICOM association is negotiated for C-Store |
| 0 | 137 SCP, several callbacks are successively invoked to specify which |
| 138 **transfer syntaxes** are accepted for the association. These | |
| 139 callbacks are listed in `this sample script | |
| 140 <https://bitbucket.org/sjodogne/orthanc/src/default/Resources/Samples/Lua/TransferSyntaxEnable.lua>`__. | |
| 141 | |
| 142 *Note:* All of these callbacks are guaranteed to be **invoked in | |
| 143 mutual exclusion**. This implies that Lua scripting in Orthanc does | |
| 357 | 144 not support any kind of concurrency. |
| 145 | |
| 146 If a callback is specified multiple times in separate scripts, the | |
| 147 event handler of the latest loaded script is used. | |
| 0 | 148 |
| 149 | |
| 150 .. _lua-rest: | |
| 151 | |
| 152 Calling the REST API of Orthanc | |
| 153 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| 154 | |
| 155 Lua scripts have :ref:`full access to the REST API <rest>` of Orthanc | |
| 156 through the following functions: | |
| 157 | |
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158 * ``RestApiGet(uri, builtin, headers)`` |
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159 * ``RestApiPost(uri, body, builtin, headers)`` |
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160 * ``RestApiPut(uri, body, builtin, headers)`` |
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161 * ``RestApiDelete(uri, builtin, headers)`` |
| 0 | 162 |
| 237 | 163 Here is a description of the parameters: |
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164 |
| 237 | 165 * ``uri`` specifies the resource being accessed |
| 166 (e.g. ``/instances``). It must not include the URL schema | |
| 167 (protocol), hostname or port. | |
| 0 | 168 |
| 237 | 169 * In the context of a POST or PUT request, ``body`` is a string |
| 170 containing the body of the request | |
| 171 (e.g. ``{"Keep":"StudyDate"}``). This string will often correspond | |
| 172 to a JSON-formatted version of a `Lua table | |
| 173 <http://lua-users.org/wiki/TablesTutorial>`__. The ``DumpJson()`` | |
| 174 function (see below) is very useful to achieve this conversion from | |
| 175 a Lua table to a plain string. | |
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176 |
| 237 | 177 * ``builtin`` is an optional Boolean that specifies whether the |
| 178 request targets only the built-in REST API of Orthanc (if set to | |
| 179 ``true``), or the full the REST API after being tainted by plugins | |
| 180 (if set to ``false``). | |
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181 |
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182 * ``headers`` is an optional argument and was added in release |
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183 1.5.7. It allows to provide the REST API endpoint with HTTP headers. |
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184 |
| 237 | 185 .. highlight:: bash |
| 186 | |
| 187 For instance:: | |
| 188 | |
| 189 RestApiPost('/instances/5af318ac-78fb-47ff-b0b0-0df18b0588e0/anonymize', '{}') | |
| 190 | |
| 0 | 191 |
| 192 General-purpose functions | |
| 193 ^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| 194 | |
| 195 The Lua engine of Orthanc contain several general-purpose ancillary | |
| 196 functions: | |
| 197 | |
| 198 * ``PrintRecursive(v)`` recursively prints the content of a `Lua table | |
| 199 <http://www.lua.org/pil/2.5.html>`__ to the log file of Orthanc. | |
| 200 * ``ParseJson(s)`` converts a string encoded in the `JSON format | |
| 201 <https://en.wikipedia.org/wiki/JSON>`__ to a Lua table. | |
| 202 * ``DumpJson(v, keepStrings)`` encodes a Lua table as a JSON string. | |
| 203 Setting the optional argument ``keepStrings`` (available from | |
| 204 release 0.9.5) to ``true`` prevents the automatic conversion of | |
| 205 strings to integers. | |
| 206 * ``GetOrthancConfiguration()`` returns a Lua table containing the | |
| 207 content of the :ref:`configuration files <configuration>` of | |
| 208 Orthanc. | |
| 209 | |
| 210 | |
| 211 Similarly to the functions to :ref:`call the REST API of Orthanc | |
| 212 <lua-rest>`, several functions are available to make generic HTTP | |
| 213 requests to Web services: | |
| 214 | |
| 90 | 215 * ``HttpGet(url, headers)`` |
| 216 * ``HttpPost(url, body, headers)`` | |
| 217 * ``HttpPut(url, body, headers)`` | |
| 218 * ``HttpDelete(url, headers)`` | |
| 0 | 219 * ``SetHttpCredentials(username, password)`` can be used to setup the |
| 220 HTTP credentials. | |
| 221 | |
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222 The ``headers`` argument is optional and was added in release |
| 91 | 223 1.2.1. It allows to set the HTTP headers for the HTTP client request. |
| 0 | 224 |
| 283 | 225 Example:: |
| 226 | |
| 227 local preview = RestApiGet('/instances/' .. instanceId .. '/preview') | |
| 228 local headers = { | |
| 229 ["content-type"] = "image/png", | |
| 230 } | |
| 231 HttpPost("http://localhost/my-web-service/instance-preview", preview, headers) | |
| 232 | |
| 0 | 233 .. _lua-origin: |
| 234 | |
| 235 Origin of the instances | |
| 236 ^^^^^^^^^^^^^^^^^^^^^^^ | |
| 237 | |
| 238 Whenever Orthanc decides whether it should should store a new instance | |
| 239 (cf. the ``ReceivedInstanceFilter()`` callback), or whenever it has | |
| 240 actually stored a new instance (cf. the ``OnStoredInstance`` | |
| 241 callback), an ``origin`` parameter is provided. This parameter is a | |
| 242 `Lua table <http://www.lua.org/pil/2.5.html>`__ that describes from | |
| 243 which Orthanc subsystem the new instance comes from. | |
| 244 | |
| 245 There are 4 possible subsystems, that can be distinguished according | |
| 246 to the value of ``origin["RequestOrigin"]``: | |
| 247 | |
| 248 * ``RestApi``: The instance originates from some HTTP request to the REST | |
| 249 API. In this case, the ``RemoteIp`` and ``Username`` fields are | |
| 250 available in ``origin``. They respectively describe the IP address | |
| 251 of the HTTP client, and the username that was used for HTTP | |
| 252 authentication (as defined in the ``RegisteredUsers`` | |
| 253 :ref:`configuration variable <configuration>`). | |
| 254 * ``DicomProtocol``: The instance originates from a DICOM C-Store. | |
| 255 The fields ``RemoteIp``, ``RemoteAet`` and ``CalledAet`` | |
| 256 respectively provide the IP address of the DICOM SCU (client), the | |
| 257 application entity title of the DICOM SCU client, and the | |
| 258 application entity title of the Orthanc SCP server. The | |
| 259 ``CalledAet`` can be used for :ref:`advanced auto-routing scenarios | |
| 260 <lua-auto-routing>`, when a single instance of Orthanc acts as a | |
| 261 proxy for several DICOM SCU clients. | |
| 262 * ``Lua``: The instance originates from a Lua script. | |
| 263 * ``Plugins``: The instance originates from a plugin. | |
| 264 | |
| 265 | |
| 266 .. _lua-filter-dicom: | |
| 267 | |
| 75 | 268 Filtering incoming DICOM instances |
| 0 | 269 ---------------------------------- |
| 270 | |
| 271 .. highlight:: lua | |
| 272 | |
| 273 Each time a DICOM instance is received by Orthanc (either through the | |
| 274 DICOM protocol or through the REST API), the | |
| 275 ``ReceivedInstanceFilter()`` Lua function is invoked. If this callback | |
| 276 returns ``true``, the instance is accepted for storage. If it returns | |
| 277 ``false``, the instance is discarded. This mechanism can be used to | |
| 278 filter the incoming DICOM instances. Here is an example of a Lua | |
| 279 filter that only allows incoming instances of MR modality:: | |
| 280 | |
| 281 function ReceivedInstanceFilter(dicom, origin) | |
| 282 -- Only allow incoming MR images | |
| 283 if dicom.Modality == 'MR' then | |
| 284 return true | |
| 285 else | |
| 286 return false | |
| 287 end | |
| 288 end | |
| 289 | |
| 290 The argument dicom corresponds to a `Lua table | |
| 291 <http://www.lua.org/pil/2.5.html>`__ (i.e. an associative array) that | |
| 292 contains the DICOM tags of the incoming instance. For debugging | |
| 293 purpose, you can print this structure as follows:: | |
| 294 | |
| 295 function ReceivedInstanceFilter(dicom, origin) | |
| 296 PrintRecursive(dicom) | |
| 297 -- Accept all incoming instances (default behavior) | |
| 298 return true | |
| 299 end | |
| 300 | |
| 301 The argument ``origin`` is :ref:`documented separately <lua-origin>`. | |
| 302 | |
| 303 | |
| 304 .. _lua-filter-rest: | |
| 305 | |
| 75 | 306 Filtering incoming REST requests |
| 0 | 307 -------------------------------- |
| 308 | |
| 309 .. highlight:: lua | |
| 310 | |
| 311 Lua scripting can be used to control the access to the various URI of | |
| 312 the REST API. Each time an incoming HTTP request is received, the | |
| 313 ``IncomingHttpRequestFilter()`` Lua function is called. The access to | |
| 314 the resource is granted if and only if this callback script returns | |
| 315 ``true``. | |
| 316 | |
| 317 This mechanism can be used to implement fine-grained `access control | |
| 25 | 318 lists <https://en.wikipedia.org/wiki/Access_control_list>`__. Here is |
| 0 | 319 an example of a Lua script that limits POST, PUT and DELETE requests |
| 320 to an user that is called "admin":: | |
| 321 | |
| 322 function IncomingHttpRequestFilter(method, uri, ip, username, httpHeaders) | |
| 323 -- Only allow GET requests for non-admin users | |
| 324 | |
| 325 if method == 'GET' then | |
| 326 return true | |
| 327 elseif username == 'admin' then | |
| 328 return true | |
| 329 else | |
| 330 return false | |
| 331 end | |
| 332 end | |
| 333 | |
| 334 Here is a description of the arguments of this Lua callback: | |
| 335 | |
| 336 * ``method``: The HTTP method (GET, POST, PUT or DELETE). | |
| 337 * ``uri``: The path to the resource (e.g. ``/tools/generate-uid``). | |
| 338 * ``ip``: The IP address of the host that has issued the HTTP request (e.g. ``127.0.0.1``). | |
| 339 * ``username``: If HTTP Basic Authentication is enabled in the | |
| 340 :ref:`configuration file <configuration>`, the name of the user that | |
| 341 has issued the HTTP request (as defined in the ``RegisteredUsers`` | |
| 342 configuration variable). If the authentication is disabled, this | |
| 343 argument is set to the empty string. | |
| 344 * ``httpHeaders``: The HTTP headers of the incoming request. This | |
| 345 argument is available since Orthanc 1.0.1. It is useful if the | |
| 346 authentication should be achieved through tokens, for instance | |
| 347 against a `LDAP | |
| 348 <https://en.wikipedia.org/wiki/Lightweight_Directory_Access_Protocol>`__ | |
| 349 or `OAuth2 <https://en.wikipedia.org/wiki/OAuth>`__ server. | |
| 350 | |
| 351 | |
| 352 .. _lua-auto-routing: | |
| 353 | |
| 75 | 354 Auto-routing of DICOM images |
| 0 | 355 ---------------------------- |
| 356 | |
| 357 .. highlight:: lua | |
| 358 | |
| 359 Since release 0.8.0, the routing of DICOM flows can be very easily | |
| 360 automated with Orthanc. All you have to do is to declare your | |
| 361 destination modality in the :ref:`configuration file <configuration>` | |
| 362 (section ``DicomModalities``), then to create and install a Lua | |
| 363 script. For instance, here is a sample script:: | |
| 364 | |
| 365 function OnStoredInstance(instanceId, tags, metadata) | |
| 366 Delete(SendToModality(instanceId, 'sample')) | |
| 367 end | |
| 368 | |
| 369 If this script is loaded into Orthanc, whenever a new DICOM instance | |
| 370 is received by Orthanc, it will be routed to the modality whose | |
| 371 symbolic name is ``sample`` (through a Store-SCU command), then it | |
| 372 will be removed from Orthanc. In other words, this is a **one-liner | |
| 373 script to implement DICOM auto-routing**. | |
| 374 | |
| 375 Very importantly, thanks to this feature, you do not have to use the | |
| 376 REST API or to create external scripts in order to automate simple | |
| 377 imaging flows. The scripting engine is entirely contained inside the | |
| 378 Orthanc core system. | |
| 379 | |
| 380 Thanks to Lua expressiveness, you can also implement conditional | |
| 381 auto-routing. For instance, if you wish to route only patients whose | |
| 382 name contains "David", you would simply write:: | |
| 383 | |
| 384 function OnStoredInstance(instanceId, tags, metadata) | |
| 385 -- Extract the value of the "PatientName" DICOM tag | |
| 386 local patientName = string.lower(tags['PatientName']) | |
| 387 | |
| 388 if string.find(patientName, 'david') ~= nil then | |
| 389 -- Only route patients whose name contains "David" | |
| 390 Delete(SendToModality(instanceId, 'sample')) | |
| 391 | |
| 392 else | |
| 393 -- Delete the patients that are not called "David" | |
| 394 Delete(instanceId) | |
| 395 end | |
| 396 end | |
| 397 | |
| 398 Besides ``SendToModality()``, a mostly identical function with the | |
| 399 same arguments called ``SendToPeer()`` can be used to route instances | |
| 400 to :ref:`Orthanc peers <peers>`. It is also possible to modify the | |
| 401 received instances before routing them. For instance, here is how you | |
| 402 would replace the ``StationName`` DICOM tag:: | |
| 403 | |
| 404 function OnStoredInstance(instanceId, tags, metadata) | |
| 405 -- Ignore the instances that result from a modification to avoid | |
| 406 -- infinite loops | |
| 407 if (metadata['ModifiedFrom'] == nil and | |
| 408 metadata['AnonymizedFrom'] == nil) then | |
| 409 | |
| 410 -- The tags to be replaced | |
| 411 local replace = {} | |
| 412 replace['StationName'] = 'My Medical Device' | |
| 413 | |
| 414 -- The tags to be removed | |
| 415 local remove = { 'MilitaryRank' } | |
| 416 | |
| 417 -- Modify the instance, send it, then delete the modified instance | |
| 418 Delete(SendToModality(ModifyInstance(instanceId, replace, remove, true), 'sample')) | |
| 419 | |
| 420 -- Delete the original instance | |
| 421 Delete(instanceId) | |
| 422 end | |
| 423 end | |
| 424 | |
| 425 | |
| 75 | 426 Important remarks about auto-routing |
| 427 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
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428 |
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429 The ``SendToModality()``, ``SendToPeer()``, ``ModifyInstance()`` and |
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430 ``Delete()`` functions are for the most basic cases of auto-routing |
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431 (implying a single DICOM instance, and possibly a basic modification |
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432 of this instance). The ``ModifyInstance()`` function `could also lead |
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433 to problems |
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434 <https://groups.google.com/d/msg/orthanc-users/hmv2y-LgKm8/oMAuGJWMBgAJ>`__ |
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435 if it deals with tags wrongly interpreted as numbers by Lua. |
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436 |
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437 For more evolved auto-routing scenarios, remember that Lua scripts |
| 191 | 438 :ref:`have full access to the REST API of Orthanc <lua-rest>`. This is |
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439 illustrated by the ``AutoroutingModification.lua`` sample available in |
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440 the source distribution of Orthanc:: |
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441 |
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442 function OnStoredInstance(instanceId, tags, metadata, origin) |
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443 -- Ignore the instances that result from the present Lua script to |
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444 -- avoid infinite loops |
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445 if origin['RequestOrigin'] ~= 'Lua' then |
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446 |
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447 -- The tags to be replaced |
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448 local replace = {} |
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449 replace['StationName'] = 'My Medical Device' |
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450 replace['0031-1020'] = 'Some private tag' |
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451 |
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452 -- The tags to be removed |
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453 local remove = { 'MilitaryRank' } |
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454 |
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455 -- Modify the instance |
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456 local command = {} |
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457 command['Replace'] = replace |
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458 command['Remove'] = remove |
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459 local modifiedFile = RestApiPost('/instances/' .. instanceId .. '/modify', DumpJson(command, true)) |
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460 |
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461 -- Upload the modified instance to the Orthanc database so that |
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462 -- it can be sent by Orthanc to other modalities |
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463 local modifiedId = ParseJson(RestApiPost('/instances/', modifiedFile)) ['ID'] |
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464 |
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465 -- Send the modified instance to another modality |
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466 RestApiPost('/modalities/sample/store', modifiedId) |
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467 |
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468 -- Delete the original and the modified instances |
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469 RestApiDelete('/instances/' .. instanceId) |
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470 RestApiDelete('/instances/' .. modifiedId) |
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471 end |
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472 end |
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473 |
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474 Also note that :ref:`other callbacks are available <lua-callbacks>` |
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475 (``OnStablePatient()``, ``OnStableStudy()`` and ``OnStableSeries()``) |
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476 to react to other events than the reception of a single instance |
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477 with ``OnStoredInstance()``. |
| 75 | 478 |
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479 .. _lua-fix-cfind: |
| 75 | 480 |
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481 Fixing C-Find requests |
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482 ---------------------- |
| 75 | 483 |
| 484 :ref:`C-Find requests <dicom-find>` are sometimes interpreted | |
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485 differently by different DICOM servers (e.g. the ``*`` wildcard, as |
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486 `reported by users |
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487 <https://groups.google.com/d/msg/orthanc-users/3g7V7kqr3g0/IREL88RWAwAJ>`__), |
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488 and sometimes a querying modality might set unexpected DICOM tags |
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489 (cf. `this real-world example |
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490 <https://groups.google.com/d/msg/orthanc-users/PLWKqVVaXLs/n_0x4vKhAgAJ>`__). In |
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491 such situations, it is possible to dynamically fix incoming or |
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492 outgoing C-Find queries using a Lua script. |
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493 |
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494 Sanitizing incoming C-Find requests can be done by implementing the |
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495 ``IncomingFindRequestFilter(query, origin)`` callback that is called |
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496 whenever the Orthanc C-Find SCP is queried by a remote modality. For |
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497 instance, here is Lua script to remove a private tag that is specified |
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498 by some manufacturer:: |
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499 |
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500 function IncomingFindRequestFilter(query, origin) |
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501 -- First display the content of the C-Find query |
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502 PrintRecursive(query) |
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503 PrintRecursive(origin) |
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504 |
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505 -- Remove the "PrivateCreator" tag from the query |
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506 local v = query |
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507 v['5555,0010'] = nil |
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508 |
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509 return v |
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510 end |
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511 |
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512 The ``origin`` argument contains information about which modality has |
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513 issued the request. |
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514 |
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515 Note that the ``IncomingFindRequestFilter`` callback is not applied to |
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516 C-Find requests targeting :ref:`modality worklists |
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517 <worklists-plugin>`. Since Orthanc 1.4.2, the corresponding |
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518 ``IncomingWorklistRequestFilter`` callback can be used to sanitize |
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519 C-FIND requests against worklists:: |
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520 |
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521 function IncomingWorklistRequestFilter(query, origin) |
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522 PrintRecursive(query) |
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523 PrintRecursive(origin) |
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524 |
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525 -- Implements the same behavior as the "FilterIssuerAet" |
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526 -- option of the sample worklist plugin |
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527 query['0040,0100'][1]['0040,0001'] = origin['RemoteAet'] |
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528 |
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529 return query |
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530 end |
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531 |
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532 Similarly, the callback ``OutgoingFindRequestFilter(query, modality)`` |
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533 is invoked whenever Orthanc acts as a C-Find SCU, which gives the |
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parents:
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534 opportunity to dynamically fix outgoing C-Find requests before they |
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parents:
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535 are actually sent to the queried modality. For instance, here is a |
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Fixing C-Find requests
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parents:
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536 sample Lua callback that would replace asterisk wildcards (i.e. ``*``) |
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parents:
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537 by an empty string for any query/retrieve issued by Orthanc (including |
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parents:
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538 from Orthanc Explorer):: |
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parents:
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539 |
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parents:
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540 function OutgoingFindRequestFilter(query, modality) |
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parents:
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541 for key, value in pairs(query) do |
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542 if value == '*' then |
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parents:
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543 query[key] = '' |
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544 end |
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parents:
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545 end |
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parents:
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546 |
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547 return query |
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548 end |