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annotate Sphinx/source/users/lua.rst @ 402:5ed3e680364e
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Mon, 27 Apr 2020 10:11:21 +0200 |
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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 | |
| 360 | 16 <https://hg.orthanc-server.com/orthanc/file/default/Resources/Samples/Lua/>`__. |
| 0 | 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 | |
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69 * ``function ReceivedInstanceFilter(dicom, origin, info)``: Invoked to |
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70 known whether an incoming DICOM instance should be |
| 0 | 71 accepted. :ref:`See this section <lua-filter-dicom>`. The ``origin`` |
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72 parameter is :ref:`documented separately <lua-origin>`. The ``info`` |
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73 parameter contains additional information and was added in Orthanc |
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74 1.6.1. |
| 0 | 75 * ``function IncomingHttpRequestFilter(method, uri, ip, username, |
| 76 httpHeaders)``: Invoked to known whether a REST request should be | |
| 77 accepted. :ref:`See this section <lua-filter-rest>`. | |
| 78 | |
| 232 | 79 Some **job-related events** allow to react to :ref:`job <jobs>` completion/failure: |
| 80 | |
| 81 * ``function OnJobSubmitted(jobId)``: | |
| 82 Invoked when a new job has been submitted. Note that this does not | |
| 83 mean the the job execution has started. | |
| 84 * ``function OnJobFailure(jobId)``: | |
| 85 Invoked when a job has failed. | |
| 86 * ``function OnJobSuccess(jobId)``: | |
| 87 Invoked when a job has completed successfully. | |
| 88 | |
| 0 | 89 Some **DICOM-related events** allow to react to the reception of |
| 90 new medical images: | |
| 91 | |
| 92 * ``function OnStoredInstance(instanceId, tags, metadata, origin)``: | |
| 93 Invoked whenever a new instance has been stored into Orthanc. | |
| 94 This is especially useful for :ref:`lua-auto-routing`. The ``origin`` | |
| 95 parameter is :ref:`documented separately <lua-origin>`. | |
| 96 * ``function OnStablePatient(patientId, tags, metadata)``: Invoked | |
| 97 whenever a patient has not received any new instance for a certain | |
| 98 amount of time (cf. the option ``StableAge`` in the | |
| 99 :ref:`configuration file <configuration>`). The :ref:`identifier | |
| 100 <orthanc-ids>` of the patient is provided, together with her DICOM | |
| 78 | 101 tags and her :ref:`metadata <metadata>`. |
| 0 | 102 * ``function OnStableSeries(seriesId, tags, metadata)``: Invoked |
| 103 whenever a series has not received any new instance for a certain | |
| 104 amount of time. | |
| 105 * ``function OnStableStudy(studyId, tags, metadata)``: Invoked | |
| 106 whenever a study has not received any new instance for a certain | |
| 107 amount of time. | |
| 108 * ``function IncomingFindRequestFilter(source, origin)``: Invoked | |
| 109 whenever Orthanc receives an incoming C-Find query through the DICOM | |
| 110 protocol. This allows to inspect the content of the C-Find query, | |
| 111 and possibly modify it if a patch is needed for some manufacturer. A | |
| 112 `sample script is available | |
| 360 | 113 <https://hg.orthanc-server.com/orthanc/file/default/Resources/Samples/Lua/IncomingFindRequestFilter.lua>`__. |
| 0 | 114 |
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115 Some other **resource-related events** are available: |
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116 |
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117 * ``function OnDeletedPatient(patientId)``: Invoked when a patient has |
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118 been removed from the Orthanc database (new in Orthanc 1.6.0). |
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119 * ``function OnDeletedStudy(studyId)``: Invoked when a study has been |
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120 removed from the Orthanc database (new in Orthanc 1.6.0). |
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121 * ``function OnDeletedSeries(seriesId)``: Invoked when a series has |
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122 been removed from the Orthanc database (new in Orthanc 1.6.0). |
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123 * ``function OnDeletedInstance(instanceId)``: Invoked when a instance |
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124 has been removed from the Orthanc database (new in Orthanc 1.6.0). |
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125 * ``function OnUpdatedPatient(patientId)``: Invoked when some metadata |
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126 or some attachment associated with the given patient has been |
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127 updated (new in Orthanc 1.6.0). |
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128 * ``function OnUpdatedStudy(studyId)``: Invoked when some metadata or |
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129 some attachment associated with the given study has been updated |
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130 (new in Orthanc 1.6.0). |
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131 * ``function OnUpdatedSeries(seriesId)``: Invoked when some metadata |
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132 or some attachment associated with the given series has been updated |
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133 (new in Orthanc 1.6.0). |
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134 * ``function OnUpdatedInstance(instanceId)``: Invoked when some |
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135 metadata or some attachment associated with the given instance has |
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136 been updated (new in Orthanc 1.6.0). |
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137 |
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138 Furthermore, whenever a DICOM association is negotiated for C-Store |
| 0 | 139 SCP, several callbacks are successively invoked to specify which |
| 140 **transfer syntaxes** are accepted for the association. These | |
| 141 callbacks are listed in `this sample script | |
| 360 | 142 <https://hg.orthanc-server.com/orthanc/file/default/Resources/Samples/Lua/TransferSyntaxEnable.lua>`__. |
| 0 | 143 |
| 144 *Note:* All of these callbacks are guaranteed to be **invoked in | |
| 145 mutual exclusion**. This implies that Lua scripting in Orthanc does | |
| 357 | 146 not support any kind of concurrency. |
| 147 | |
| 148 If a callback is specified multiple times in separate scripts, the | |
| 149 event handler of the latest loaded script is used. | |
| 0 | 150 |
| 151 | |
| 152 .. _lua-rest: | |
| 153 | |
| 154 Calling the REST API of Orthanc | |
| 155 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| 156 | |
| 157 Lua scripts have :ref:`full access to the REST API <rest>` of Orthanc | |
| 158 through the following functions: | |
| 159 | |
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160 * ``RestApiGet(uri, builtin, headers)`` |
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161 * ``RestApiPost(uri, body, builtin, headers)`` |
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162 * ``RestApiPut(uri, body, builtin, headers)`` |
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163 * ``RestApiDelete(uri, builtin, headers)`` |
| 0 | 164 |
| 237 | 165 Here is a description of the parameters: |
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166 |
| 237 | 167 * ``uri`` specifies the resource being accessed |
| 168 (e.g. ``/instances``). It must not include the URL schema | |
| 169 (protocol), hostname or port. | |
| 0 | 170 |
| 237 | 171 * In the context of a POST or PUT request, ``body`` is a string |
| 172 containing the body of the request | |
| 173 (e.g. ``{"Keep":"StudyDate"}``). This string will often correspond | |
| 174 to a JSON-formatted version of a `Lua table | |
| 175 <http://lua-users.org/wiki/TablesTutorial>`__. The ``DumpJson()`` | |
| 176 function (see below) is very useful to achieve this conversion from | |
| 177 a Lua table to a plain string. | |
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178 |
| 237 | 179 * ``builtin`` is an optional Boolean that specifies whether the |
| 180 request targets only the built-in REST API of Orthanc (if set to | |
| 181 ``true``), or the full the REST API after being tainted by plugins | |
| 182 (if set to ``false``). | |
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183 |
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184 * ``headers`` is an optional argument and was added in release |
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185 1.5.7. It allows to provide the REST API endpoint with HTTP headers. |
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186 |
| 237 | 187 .. highlight:: bash |
| 188 | |
| 189 For instance:: | |
| 190 | |
| 191 RestApiPost('/instances/5af318ac-78fb-47ff-b0b0-0df18b0588e0/anonymize', '{}') | |
| 192 | |
| 0 | 193 |
| 194 General-purpose functions | |
| 195 ^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| 196 | |
| 197 The Lua engine of Orthanc contain several general-purpose ancillary | |
| 198 functions: | |
| 199 | |
| 200 * ``PrintRecursive(v)`` recursively prints the content of a `Lua table | |
| 201 <http://www.lua.org/pil/2.5.html>`__ to the log file of Orthanc. | |
| 202 * ``ParseJson(s)`` converts a string encoded in the `JSON format | |
| 203 <https://en.wikipedia.org/wiki/JSON>`__ to a Lua table. | |
| 204 * ``DumpJson(v, keepStrings)`` encodes a Lua table as a JSON string. | |
| 205 Setting the optional argument ``keepStrings`` (available from | |
| 206 release 0.9.5) to ``true`` prevents the automatic conversion of | |
| 207 strings to integers. | |
| 208 * ``GetOrthancConfiguration()`` returns a Lua table containing the | |
| 209 content of the :ref:`configuration files <configuration>` of | |
| 210 Orthanc. | |
| 211 | |
| 212 | |
| 213 Similarly to the functions to :ref:`call the REST API of Orthanc | |
| 214 <lua-rest>`, several functions are available to make generic HTTP | |
| 215 requests to Web services: | |
| 216 | |
| 90 | 217 * ``HttpGet(url, headers)`` |
| 218 * ``HttpPost(url, body, headers)`` | |
| 219 * ``HttpPut(url, body, headers)`` | |
| 220 * ``HttpDelete(url, headers)`` | |
| 0 | 221 * ``SetHttpCredentials(username, password)`` can be used to setup the |
| 222 HTTP credentials. | |
| 223 | |
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224 The ``headers`` argument is optional and was added in release |
| 91 | 225 1.2.1. It allows to set the HTTP headers for the HTTP client request. |
| 0 | 226 |
| 283 | 227 Example:: |
| 228 | |
| 229 local preview = RestApiGet('/instances/' .. instanceId .. '/preview') | |
| 230 local headers = { | |
| 231 ["content-type"] = "image/png", | |
| 232 } | |
| 233 HttpPost("http://localhost/my-web-service/instance-preview", preview, headers) | |
| 234 | |
| 0 | 235 .. _lua-origin: |
| 236 | |
| 237 Origin of the instances | |
| 238 ^^^^^^^^^^^^^^^^^^^^^^^ | |
| 239 | |
| 240 Whenever Orthanc decides whether it should should store a new instance | |
| 241 (cf. the ``ReceivedInstanceFilter()`` callback), or whenever it has | |
| 242 actually stored a new instance (cf. the ``OnStoredInstance`` | |
| 243 callback), an ``origin`` parameter is provided. This parameter is a | |
| 244 `Lua table <http://www.lua.org/pil/2.5.html>`__ that describes from | |
| 245 which Orthanc subsystem the new instance comes from. | |
| 246 | |
| 247 There are 4 possible subsystems, that can be distinguished according | |
| 248 to the value of ``origin["RequestOrigin"]``: | |
| 249 | |
| 250 * ``RestApi``: The instance originates from some HTTP request to the REST | |
| 251 API. In this case, the ``RemoteIp`` and ``Username`` fields are | |
| 252 available in ``origin``. They respectively describe the IP address | |
| 253 of the HTTP client, and the username that was used for HTTP | |
| 254 authentication (as defined in the ``RegisteredUsers`` | |
| 255 :ref:`configuration variable <configuration>`). | |
| 256 * ``DicomProtocol``: The instance originates from a DICOM C-Store. | |
| 257 The fields ``RemoteIp``, ``RemoteAet`` and ``CalledAet`` | |
| 258 respectively provide the IP address of the DICOM SCU (client), the | |
| 259 application entity title of the DICOM SCU client, and the | |
| 260 application entity title of the Orthanc SCP server. The | |
| 261 ``CalledAet`` can be used for :ref:`advanced auto-routing scenarios | |
| 262 <lua-auto-routing>`, when a single instance of Orthanc acts as a | |
| 263 proxy for several DICOM SCU clients. | |
| 264 * ``Lua``: The instance originates from a Lua script. | |
| 265 * ``Plugins``: The instance originates from a plugin. | |
| 266 | |
| 267 | |
| 268 .. _lua-filter-dicom: | |
| 269 | |
| 75 | 270 Filtering incoming DICOM instances |
| 0 | 271 ---------------------------------- |
| 272 | |
| 273 .. highlight:: lua | |
| 274 | |
| 275 Each time a DICOM instance is received by Orthanc (either through the | |
| 276 DICOM protocol or through the REST API), the | |
| 277 ``ReceivedInstanceFilter()`` Lua function is invoked. If this callback | |
| 278 returns ``true``, the instance is accepted for storage. If it returns | |
| 279 ``false``, the instance is discarded. This mechanism can be used to | |
| 280 filter the incoming DICOM instances. Here is an example of a Lua | |
| 281 filter that only allows incoming instances of MR modality:: | |
| 282 | |
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283 function ReceivedInstanceFilter(dicom, origin, info) |
| 0 | 284 -- Only allow incoming MR images |
| 285 if dicom.Modality == 'MR' then | |
| 286 return true | |
| 287 else | |
| 288 return false | |
| 289 end | |
| 290 end | |
| 291 | |
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292 The argument ``dicom`` corresponds to a `Lua table |
| 0 | 293 <http://www.lua.org/pil/2.5.html>`__ (i.e. an associative array) that |
| 294 contains the DICOM tags of the incoming instance. For debugging | |
| 295 purpose, you can print this structure as follows:: | |
| 296 | |
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297 function ReceivedInstanceFilter(dicom, origin, info) |
| 0 | 298 PrintRecursive(dicom) |
| 299 -- Accept all incoming instances (default behavior) | |
| 300 return true | |
| 301 end | |
| 302 | |
| 303 The argument ``origin`` is :ref:`documented separately <lua-origin>`. | |
| 304 | |
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305 The argument ``info`` was introduced in Orthanc 1.6.1. It contains |
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306 some additional information about the received DICOM instance, |
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307 notably: |
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308 |
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309 * ``HasPixelData`` is ``true`` iff. the Pixel Data (7FE0,0010) tag is |
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310 present. |
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311 * ``TransferSyntaxUID`` contains the transfer syntax UID of the |
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312 dataset of the instance (if applicable). |
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313 |
| 0 | 314 |
| 315 .. _lua-filter-rest: | |
| 316 | |
| 75 | 317 Filtering incoming REST requests |
| 0 | 318 -------------------------------- |
| 319 | |
| 320 .. highlight:: lua | |
| 321 | |
| 322 Lua scripting can be used to control the access to the various URI of | |
| 323 the REST API. Each time an incoming HTTP request is received, the | |
| 324 ``IncomingHttpRequestFilter()`` Lua function is called. The access to | |
| 325 the resource is granted if and only if this callback script returns | |
| 326 ``true``. | |
| 327 | |
| 328 This mechanism can be used to implement fine-grained `access control | |
| 25 | 329 lists <https://en.wikipedia.org/wiki/Access_control_list>`__. Here is |
| 0 | 330 an example of a Lua script that limits POST, PUT and DELETE requests |
| 331 to an user that is called "admin":: | |
| 332 | |
| 333 function IncomingHttpRequestFilter(method, uri, ip, username, httpHeaders) | |
| 334 -- Only allow GET requests for non-admin users | |
| 335 | |
| 336 if method == 'GET' then | |
| 337 return true | |
| 338 elseif username == 'admin' then | |
| 339 return true | |
| 340 else | |
| 341 return false | |
| 342 end | |
| 343 end | |
| 344 | |
| 345 Here is a description of the arguments of this Lua callback: | |
| 346 | |
| 347 * ``method``: The HTTP method (GET, POST, PUT or DELETE). | |
| 348 * ``uri``: The path to the resource (e.g. ``/tools/generate-uid``). | |
| 349 * ``ip``: The IP address of the host that has issued the HTTP request (e.g. ``127.0.0.1``). | |
| 350 * ``username``: If HTTP Basic Authentication is enabled in the | |
| 351 :ref:`configuration file <configuration>`, the name of the user that | |
| 352 has issued the HTTP request (as defined in the ``RegisteredUsers`` | |
| 353 configuration variable). If the authentication is disabled, this | |
| 354 argument is set to the empty string. | |
| 355 * ``httpHeaders``: The HTTP headers of the incoming request. This | |
| 356 argument is available since Orthanc 1.0.1. It is useful if the | |
| 357 authentication should be achieved through tokens, for instance | |
| 358 against a `LDAP | |
| 359 <https://en.wikipedia.org/wiki/Lightweight_Directory_Access_Protocol>`__ | |
| 360 or `OAuth2 <https://en.wikipedia.org/wiki/OAuth>`__ server. | |
| 361 | |
| 362 | |
| 363 .. _lua-auto-routing: | |
| 364 | |
| 75 | 365 Auto-routing of DICOM images |
| 0 | 366 ---------------------------- |
| 367 | |
| 368 .. highlight:: lua | |
| 369 | |
| 370 Since release 0.8.0, the routing of DICOM flows can be very easily | |
| 371 automated with Orthanc. All you have to do is to declare your | |
| 372 destination modality in the :ref:`configuration file <configuration>` | |
| 373 (section ``DicomModalities``), then to create and install a Lua | |
| 374 script. For instance, here is a sample script:: | |
| 375 | |
| 376 function OnStoredInstance(instanceId, tags, metadata) | |
| 377 Delete(SendToModality(instanceId, 'sample')) | |
| 378 end | |
| 379 | |
| 380 If this script is loaded into Orthanc, whenever a new DICOM instance | |
| 381 is received by Orthanc, it will be routed to the modality whose | |
| 382 symbolic name is ``sample`` (through a Store-SCU command), then it | |
| 383 will be removed from Orthanc. In other words, this is a **one-liner | |
| 384 script to implement DICOM auto-routing**. | |
| 385 | |
| 386 Very importantly, thanks to this feature, you do not have to use the | |
| 387 REST API or to create external scripts in order to automate simple | |
| 388 imaging flows. The scripting engine is entirely contained inside the | |
| 389 Orthanc core system. | |
| 390 | |
| 391 Thanks to Lua expressiveness, you can also implement conditional | |
| 392 auto-routing. For instance, if you wish to route only patients whose | |
| 393 name contains "David", you would simply write:: | |
| 394 | |
| 395 function OnStoredInstance(instanceId, tags, metadata) | |
| 396 -- Extract the value of the "PatientName" DICOM tag | |
| 397 local patientName = string.lower(tags['PatientName']) | |
| 398 | |
| 399 if string.find(patientName, 'david') ~= nil then | |
| 400 -- Only route patients whose name contains "David" | |
| 401 Delete(SendToModality(instanceId, 'sample')) | |
| 402 | |
| 403 else | |
| 404 -- Delete the patients that are not called "David" | |
| 405 Delete(instanceId) | |
| 406 end | |
| 407 end | |
| 408 | |
| 409 Besides ``SendToModality()``, a mostly identical function with the | |
| 410 same arguments called ``SendToPeer()`` can be used to route instances | |
| 411 to :ref:`Orthanc peers <peers>`. It is also possible to modify the | |
| 412 received instances before routing them. For instance, here is how you | |
| 413 would replace the ``StationName`` DICOM tag:: | |
| 414 | |
| 415 function OnStoredInstance(instanceId, tags, metadata) | |
| 416 -- Ignore the instances that result from a modification to avoid | |
| 417 -- infinite loops | |
| 418 if (metadata['ModifiedFrom'] == nil and | |
| 419 metadata['AnonymizedFrom'] == nil) then | |
| 420 | |
| 421 -- The tags to be replaced | |
| 422 local replace = {} | |
| 423 replace['StationName'] = 'My Medical Device' | |
| 424 | |
| 425 -- The tags to be removed | |
| 426 local remove = { 'MilitaryRank' } | |
| 427 | |
| 428 -- Modify the instance, send it, then delete the modified instance | |
| 429 Delete(SendToModality(ModifyInstance(instanceId, replace, remove, true), 'sample')) | |
| 430 | |
| 431 -- Delete the original instance | |
| 432 Delete(instanceId) | |
| 433 end | |
| 434 end | |
| 435 | |
| 436 | |
| 75 | 437 Important remarks about auto-routing |
| 438 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
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439 |
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440 The ``SendToModality()``, ``SendToPeer()``, ``ModifyInstance()`` and |
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441 ``Delete()`` functions are for the most basic cases of auto-routing |
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442 (implying a single DICOM instance, and possibly a basic modification |
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443 of this instance). The ``ModifyInstance()`` function `could also lead |
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444 to problems |
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445 <https://groups.google.com/d/msg/orthanc-users/hmv2y-LgKm8/oMAuGJWMBgAJ>`__ |
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446 if it deals with tags wrongly interpreted as numbers by Lua. |
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447 |
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448 For more evolved auto-routing scenarios, remember that Lua scripts |
| 191 | 449 :ref:`have full access to the REST API of Orthanc <lua-rest>`. This is |
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450 illustrated by the ``AutoroutingModification.lua`` sample available in |
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451 the source distribution of Orthanc:: |
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452 |
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453 function OnStoredInstance(instanceId, tags, metadata, origin) |
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454 -- Ignore the instances that result from the present Lua script to |
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455 -- avoid infinite loops |
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456 if origin['RequestOrigin'] ~= 'Lua' then |
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457 |
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458 -- The tags to be replaced |
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459 local replace = {} |
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460 replace['StationName'] = 'My Medical Device' |
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461 replace['0031-1020'] = 'Some private tag' |
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462 |
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463 -- The tags to be removed |
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464 local remove = { 'MilitaryRank' } |
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465 |
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466 -- Modify the instance |
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467 local command = {} |
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468 command['Replace'] = replace |
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469 command['Remove'] = remove |
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470 local modifiedFile = RestApiPost('/instances/' .. instanceId .. '/modify', DumpJson(command, true)) |
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471 |
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472 -- Upload the modified instance to the Orthanc database so that |
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473 -- it can be sent by Orthanc to other modalities |
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474 local modifiedId = ParseJson(RestApiPost('/instances/', modifiedFile)) ['ID'] |
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475 |
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476 -- Send the modified instance to another modality |
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477 RestApiPost('/modalities/sample/store', modifiedId) |
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478 |
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479 -- Delete the original and the modified instances |
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480 RestApiDelete('/instances/' .. instanceId) |
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481 RestApiDelete('/instances/' .. modifiedId) |
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482 end |
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483 end |
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484 |
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485 Also note that :ref:`other callbacks are available <lua-callbacks>` |
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486 (``OnStablePatient()``, ``OnStableStudy()`` and ``OnStableSeries()``) |
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487 to react to other events than the reception of a single instance |
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488 with ``OnStoredInstance()``. |
| 75 | 489 |
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490 .. _lua-fix-cfind: |
| 75 | 491 |
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492 Fixing C-Find requests |
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493 ---------------------- |
| 75 | 494 |
| 495 :ref:`C-Find requests <dicom-find>` are sometimes interpreted | |
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496 differently by different DICOM servers (e.g. the ``*`` wildcard, as |
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497 `reported by users |
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498 <https://groups.google.com/d/msg/orthanc-users/3g7V7kqr3g0/IREL88RWAwAJ>`__), |
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499 and sometimes a querying modality might set unexpected DICOM tags |
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500 (cf. `this real-world example |
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501 <https://groups.google.com/d/msg/orthanc-users/PLWKqVVaXLs/n_0x4vKhAgAJ>`__). In |
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502 such situations, it is possible to dynamically fix incoming or |
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503 outgoing C-Find queries using a Lua script. |
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504 |
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505 Sanitizing incoming C-Find requests can be done by implementing the |
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506 ``IncomingFindRequestFilter(query, origin)`` callback that is called |
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507 whenever the Orthanc C-Find SCP is queried by a remote modality. For |
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508 instance, here is Lua script to remove a private tag that is specified |
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509 by some manufacturer:: |
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510 |
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511 function IncomingFindRequestFilter(query, origin) |
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512 -- First display the content of the C-Find query |
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513 PrintRecursive(query) |
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514 PrintRecursive(origin) |
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515 |
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516 -- Remove the "PrivateCreator" tag from the query |
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517 local v = query |
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518 v['5555,0010'] = nil |
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519 |
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520 return v |
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521 end |
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522 |
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523 The ``origin`` argument contains information about which modality has |
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524 issued the request. |
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525 |
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526 Note that the ``IncomingFindRequestFilter`` callback is not applied to |
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527 C-Find requests targeting :ref:`modality worklists |
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528 <worklists-plugin>`. Since Orthanc 1.4.2, the corresponding |
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529 ``IncomingWorklistRequestFilter`` callback can be used to sanitize |
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530 C-FIND requests against worklists:: |
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531 |
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532 function IncomingWorklistRequestFilter(query, origin) |
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533 PrintRecursive(query) |
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534 PrintRecursive(origin) |
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535 |
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536 -- Implements the same behavior as the "FilterIssuerAet" |
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537 -- option of the sample worklist plugin |
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538 query['0040,0100'][1]['0040,0001'] = origin['RemoteAet'] |
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539 |
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540 return query |
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541 end |
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542 |
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543 Similarly, the callback ``OutgoingFindRequestFilter(query, modality)`` |
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544 is invoked whenever Orthanc acts as a C-Find SCU, which gives the |
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545 opportunity to dynamically fix outgoing C-Find requests before they |
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546 are actually sent to the queried modality. For instance, here is a |
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547 sample Lua callback that would replace asterisk wildcards (i.e. ``*``) |
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548 by an empty string for any query/retrieve issued by Orthanc (including |
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549 from Orthanc Explorer):: |
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550 |
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551 function OutgoingFindRequestFilter(query, modality) |
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552 for key, value in pairs(query) do |
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553 if value == '*' then |
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554 query[key] = '' |
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555 end |
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556 end |
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557 |
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558 return query |
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559 end |