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annotate Sphinx/source/users/advanced-rest.rst @ 596:ef64d0769014
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
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| date | Mon, 18 Jan 2021 11:12:01 +0100 |
| parents | 090cc988c35e |
| children | eaa6cdfa7ba6 |
| rev | line source |
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1 .. _rest-advanced: |
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2 |
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3 Advanced features of the REST API |
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4 ================================= |
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5 |
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6 .. contents:: |
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7 :depth: 3 |
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8 |
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9 This section of the Orthanc Book is a complement to the description of |
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10 the :ref:`REST API of Orthanc <rest>`. It explains some advanced uses |
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11 of the API. |
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12 |
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13 |
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14 .. _jobs: |
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15 |
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16 Jobs |
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17 ---- |
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18 |
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19 Since Orthanc 1.4.0, a jobs engine is embedded within Orthanc. Jobs |
| 227 | 20 are high-level tasks to be processed by Orthanc. Jobs are first added |
| 21 to a queue of pending tasks, and Orthanc will simultaneously execute a | |
| 22 fixed number of jobs (check out :ref:`configuration option | |
| 23 <configuration>` ``ConcurrentJobs``). Once the jobs have been | |
| 24 processed, they are tagged as successful or failed, and kept in a | |
| 25 history (the size of this history is controlled by the | |
| 26 ``JobsHistorySize`` option). | |
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27 |
| 227 | 28 By default, Orthanc saves the jobs into its database (check out the |
| 29 ``SaveJobs`` option). If Orthanc is stopped then relaunched, the jobs | |
| 30 whose processing was not finished are automatically put into the queue | |
| 31 of pending tasks. The command-line option ``--no-jobs`` can also be | |
| 32 used to prevent the loading of jobs from the database upon the launch | |
| 33 of Orthanc. | |
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34 |
| 227 | 35 Note that the queue of pending jobs has a maximum size (check out the |
| 36 ``LimitJobs`` option). When this limit is reached, the addition of new | |
| 37 jobs is blocked until some job finishes. | |
| 38 | |
| 39 | |
| 40 | |
| 41 Synchronous vs. asynchronous calls | |
| 42 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| 43 | |
| 44 Some calls to the REST API of Orthanc need time to be executed, and | |
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45 thus result in adding a job to the processing queue. This notably |
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46 includes the following URIs: |
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47 |
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48 * :ref:`Modifying and anonymizing <anonymization>` DICOM instances. |
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49 * Creating ZIP or media archives. |
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50 * C-Move SCU (``/queries/.../retrieve``). |
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51 * C-Store SCU (``/modalities/.../store``). |
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52 * Sending to an Orthanc peer (``/peers/.../store``). |
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53 * :ref:`Split/merge <split-merge>`. |
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54 * Sending images using the :ref:`transfers accelerator <transfers>` plugin. |
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55 |
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56 Such REST API calls can be configured to be executed in a synchronous |
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57 or an asynchronous mode: |
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58 |
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59 * **Synchronous calls** wait for the end of the execution of their |
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60 associated job. This is in general the default behavior. |
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61 * **Asynchronous calls** end immediately and return a handle to their |
| 227 | 62 associated job. It is up to the caller to monitor the execution by |
| 63 calling the jobs API (e.g. to know whether the job has finished its | |
| 64 execution). | |
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65 |
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66 The choice between synchronous and asynchronous modes is done by |
| 227 | 67 setting the ``Synchronous`` field (or indifferently the |
| 68 ``Asynchronous`` field) in the POST body of the call to the REST | |
| 69 API. Note that the :ref:`transfers accelerator <transfers>` only runs | |
| 70 in asynchronous mode. | |
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71 |
| 227 | 72 An integer number (possibly negative) can be specified in the |
| 73 ``Priority`` field of the POST body. Jobs with higher priority will be | |
| 74 executed first. By default, the priority is set to zero. | |
| 75 | |
| 76 Despite being more complex to handle, the asynchronous mode is highly | |
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77 recommended for jobs whose execution time can last over a dozen of |
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78 seconds (typically, the creation of an archive or a network transfer). |
| 227 | 79 Indeed, synchronous calls can be affected by timeouts in the HTTP |
| 80 protocol if they last too long. | |
| 81 | |
| 82 | |
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83 .. _jobs-monitoring: |
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84 |
| 227 | 85 Monitoring jobs |
| 86 ^^^^^^^^^^^^^^^ | |
| 87 | |
| 88 .. highlight:: bash | |
| 89 | |
| 90 The list of all jobs can be retrieved as follows:: | |
| 91 | |
| 92 $ curl http://localhost:8042/jobs | |
| 93 [ "e0d12aac-47eb-454f-bb7f-9857931e2904" ] | |
| 94 | |
| 95 Full details about each job can be retrieved:: | |
| 96 | |
| 97 $ curl http://localhost:8042/jobs/e0d12aac-47eb-454f-bb7f-9857931e2904 | |
| 98 { | |
| 99 "CompletionTime" : "20190306T095223.753851", | |
| 100 "Content" : { | |
| 101 "Description" : "REST API", | |
| 102 "InstancesCount" : 1, | |
| 103 "UncompressedSizeMB" : 0 | |
| 104 }, | |
| 105 "CreationTime" : "20190306T095223.750666", | |
| 106 "EffectiveRuntime" : 0.001, | |
| 107 "ErrorCode" : 0, | |
| 108 "ErrorDescription" : "Success", | |
| 109 "ID" : "e0d12aac-47eb-454f-bb7f-9857931e2904", | |
| 110 "Priority" : 0, | |
| 111 "Progress" : 100, | |
| 112 "State" : "Success", | |
| 113 "Timestamp" : "20190306T095408.556082", | |
| 114 "Type" : "Archive" | |
| 115 } | |
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116 |
| 227 | 117 Note that the ``/jobs?expand`` URI will retrieve this information in |
| 118 one single REST query. The ``Content`` field contains the parameters | |
| 119 of the job, and is very specific to the ``Type`` of job. | |
| 120 | |
| 121 The ``State`` field can be: | |
| 122 | |
| 123 * ``Pending``: The job is waiting to be executed. | |
| 124 * ``Running``: The job is being executed. The ``Progress`` field will | |
| 125 be continuously updated to reflect the progression of the execution. | |
| 126 * ``Success``: The job has finished with success. | |
| 127 * ``Failure``: The job has finished with failure. Check out the | |
| 128 ``ErrorCode`` and ``ErrorDescription`` fields for more information. | |
| 129 * ``Paused``: The job has been paused. | |
| 130 * ``Retry``: The job has failed internally, and has been scheduled for | |
| 568 | 131 re-submission after a delay. As of Orthanc 1.8.2, this feature is not |
| 227 | 132 used by any type of job. |
| 133 | |
| 134 In order to wait for the end of an asynchronous call, the caller will | |
| 135 typically have to poll the ``/jobs/...` URI (i.e. make periodic | |
| 136 calls), waiting for the ``State`` field to become ``Success`` or | |
| 137 ``Failure``. | |
| 138 | |
| 139 | |
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140 .. _jobs-controlling: |
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141 |
| 227 | 142 Interacting with jobs |
| 143 ^^^^^^^^^^^^^^^^^^^^^ | |
| 144 | |
| 145 Given the ID of some job, one can: | |
| 146 | |
| 147 * Cancel the job by POST-ing to ``/jobs/.../cancel``. | |
| 148 * Pause the job by POST-ing to ``/jobs/.../pause``. | |
| 149 * Resume a job in ``Paused`` state by POST-ing to ``/jobs/.../resume``. | |
| 150 * Retry a job in ``Failed`` state by POST-ing to ``/jobs/.../resubmit``. | |
| 151 | |
| 152 The related state machine is depicted in the `implementation notes | |
| 449 | 153 <https://hg.orthanc-server.com/orthanc/raw-file/default/OrthancServer/Resources/ImplementationNotes/JobsEngineStates.pdf>`__. |
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154 |
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155 |
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156 Example: Asynchronous generation of an archive |
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157 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
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158 |
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159 .. highlight:: bash |
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160 |
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161 Sucessful jobs are associated with a set of so-called "outputs" that |
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162 can be attached to the job. |
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163 |
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164 Here is a sample bash session to ask Orthanc to generate a ZIP |
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165 archive, then to download it locally:: |
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166 |
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167 $ curl http://localhost:8042/studies/27f7126f-4f66fb14-03f4081b-f9341db2-53925988/archive -d '{"Asynchronous":true}' |
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168 { |
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169 "ID" : "82cc02d1-03fe-41f9-be46-a308d16ea94a", |
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170 "Path" : "/jobs/82cc02d1-03fe-41f9-be46-a308d16ea94a" |
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171 } |
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172 $ curl http://localhost:8042/jobs/82cc02d1-03fe-41f9-be46-a308d16ea94a |
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173 { |
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174 "CompletionTime" : "20200817T144700.401777", |
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175 "Content" : { |
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176 "Description" : "REST API", |
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177 "InstancesCount" : 232, |
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178 "UncompressedSizeMB" : 64 |
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179 }, |
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180 "CreationTime" : "20200817T144658.011824", |
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181 "EffectiveRuntime" : 2.3879999999999999, |
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182 "ErrorCode" : 0, |
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183 "ErrorDescription" : "Success", |
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184 "ID" : "82cc02d1-03fe-41f9-be46-a308d16ea94a", |
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185 "Priority" : 0, |
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186 "Progress" : 100, |
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187 "State" : "Success", |
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188 "Timestamp" : "20200817T144705.770825", |
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189 "Type" : "Archive" |
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190 } |
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191 $ curl http://localhost:8042/jobs/82cc02d1-03fe-41f9-be46-a308d16ea94a/archive > a.zip |
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192 |
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193 Note how we retrieve the content of the archive by accessing the |
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194 ``archive`` output of the job (check out the virtual method |
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195 ``IJob::GetOutput()`` from the `source code |
| 568 | 196 <https://hg.orthanc-server.com/orthanc/file/Orthanc-1.8.2/OrthancServer/Sources/ServerJobs/ArchiveJob.cpp>`__ |
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197 of Orthanc). |
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198 |
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199 Here is the corresponding sequence of commands to generate a DICOMDIR |
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200 media:: |
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201 |
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202 $ curl http://localhost:8042/studies/27f7126f-4f66fb14-03f4081b-f9341db2-53925988/media -d '{"Asynchronous":true}' |
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203 $ curl http://localhost:8042/jobs/6332be8a-0052-44fb-8cc2-ac959aeccad9/archive > a.zip |
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204 |
| 568 | 205 As of Orthanc 1.8.2, only the creation of a ZIP or a DICOMDIR archive |
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206 produces such "outputs". |
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207 |
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208 |
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209 .. _pdf: |
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210 |
| 310 | 211 Attaching PDF file as DICOM series |
| 212 ---------------------------------- | |
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213 |
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214 Among many different types of data, DICOM files can be used to store |
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215 PDF files. The ``/tools/create-dicom`` URI can be used to upload a PDF |
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216 file to Orthanc. The following scripts perform such a *DICOM-ization*; |
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217 They convert the ``HelloWorld2.pdf`` file to base64, then perform a |
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218 ``POST`` request with JSON data containing the converted payload. |
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219 |
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220 Importantly, the ``Parent`` field of the ``POST`` body can be set to |
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221 the :ref:`Orthanc identifier of some study <orthanc-ids>` in order to |
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222 attach the newly-created PDF series to the given parent study. |
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223 |
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224 Using bash: |
| 227 | 225 |
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226 .. code-block:: bash |
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227 |
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228 # create the json data, with the BASE64 data embedded in it |
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229 (echo -n '{"Parent": "b6e8436b-c5835b7b-cecc9576-0483e165-ab5c710b", "Tags" : {"Modality" : "CT"}, "Content" : "data:application/pdf;base64,'; base64 HelloWorld2.pdf; echo '"}') > /tmp/foo |
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230 |
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231 # upload it to Orthanc |
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232 cat /tmp/foo | curl -H "Content-Type: application/json" -d @- http://localhost:8042/tools/create-dicom |
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233 |
| 227 | 234 |
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235 Using powershell: |
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236 |
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237 .. code-block:: perl |
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238 |
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239 # create the BASE64 string data |
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240 $fileInBase64 = $([Convert]::ToBase64String((gc -Path "HelloWorld2.pdf" -Encoding Byte))) |
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241 |
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242 # create the json data |
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243 $params = @{Tags = @{PatientName = "Benjamino";Modality = "CT"};Content= "data:application/pdf;base64,$fileInBase64"} |
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244 |
| 376 | 245 # disabling the progress bar makes the Invoke-RestMethod call MUCH faster |
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246 $ProgressPreference = 'SilentlyContinue' |
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247 |
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248 # upload it to Orthanc |
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249 $reply = Invoke-RestMethod http://localhost:8042/tools/create-dicom -Method POST -Body ($params|ConvertTo-Json) -ContentType 'application/json' |
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250 |
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251 # display the result |
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252 Write-Host "The instance can be retrieved in PDF at http://localhost:8042$($reply.Path)/pdf" |
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253 |
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254 Please note that the ``/tools/create-dicom`` API call will return the |
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255 Orthanc instance ID of the newly created DICOM resource. |
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256 |
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257 You can use the ``/instances/.../pdf`` URI to retrieve an embedded PDF |
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258 file. |
| 228 | 259 |
| 260 | |
| 596 | 261 .. _private-tags: |
| 262 | |
| 263 Creating DICOM instance with private tags | |
| 264 ----------------------------------------- | |
| 265 | |
| 266 .. highlight:: json | |
| 267 | |
| 268 The ``/tools/create-dicom`` URI can be used to create DICOM instances | |
| 269 containing private tags. Those private tags must first be defined in | |
| 270 the ``Dictionary`` configuration option of Orthanc. Importantly, the | |
| 271 ``xxxx,0010`` tag must be defined to register the private creator, | |
| 272 where ``xxxx`` is the private group of interest. Here is a sample:: | |
| 273 | |
| 274 { | |
| 275 "Dictionary" : { | |
| 276 "0405,0010" : [ "LO", "Private data element", 1, 1, "RawDataStore" ], | |
| 277 "0405,1001" : [ "ST", "XML", 1, 1, "RawDataStore" ] | |
| 278 } | |
| 279 } | |
| 280 | |
| 281 Once Orthanc is started using this configuration file, it is possible | |
| 282 to create a DICOM instance using the following POST body on | |
| 283 ``/tools/create-dicom``:: | |
| 284 | |
| 285 { | |
| 286 "PrivateCreator" : "RawDataStore", | |
| 287 "Tags" : | |
| 288 { | |
| 289 "PatientName" : "Love^Sarah", | |
| 290 "PatientID" : "7", | |
| 291 "0405,0010" : "RawDataStore", | |
| 292 "0405,1001" : "<xml><test>Testing</test></xml>" | |
| 293 } | |
| 294 } | |
| 295 | |
| 228 | 296 |
| 297 .. _prometheus: | |
| 298 | |
| 299 Instrumentation with Prometheus | |
| 300 ------------------------------- | |
| 301 | |
| 302 .. highlight:: text | |
| 303 | |
| 304 Orthanc publishes its metrics according to the `text-based format of | |
| 305 Prometheus | |
| 306 <https://prometheus.io/docs/instrumenting/exposition_formats/#text-based-format>`__ | |
| 307 (check also the `OpenMetrics project <https://openmetrics.io/>`__), onto | |
| 308 the ``/tools/metrics-prometheus`` URI of the REST API. For instance:: | |
| 309 | |
| 310 $ curl http://localhost:8042/tools/metrics-prometheus | |
| 311 orthanc_count_instances 1 1551868380543 | |
| 312 orthanc_count_patients 1 1551868380543 | |
| 313 orthanc_count_series 1 1551868380543 | |
| 314 orthanc_count_studies 1 1551868380543 | |
| 315 orthanc_disk_size_mb 0.0135002136 1551868380543 | |
| 316 orthanc_jobs_completed 1 1551868380543 | |
| 317 orthanc_jobs_failed 0 1551868380543 | |
| 318 orthanc_jobs_pending 0 1551868380543 | |
| 319 orthanc_jobs_running 0 1551868380543 | |
| 320 orthanc_jobs_success 1 1551868380543 | |
| 321 orthanc_rest_api_active_requests 1 1551868380543 | |
| 322 orthanc_rest_api_duration_ms 0 1551868094265 | |
| 323 orthanc_storage_create_duration_ms 0 1551865919315 | |
| 324 orthanc_storage_read_duration_ms 0 1551865943752 | |
| 325 orthanc_store_dicom_duration_ms 5 1551865919319 | |
| 326 orthanc_uncompressed_size_mb 0.0135002136 1551868380543 | |
| 327 | |
| 328 | |
| 329 .. highlight:: bash | |
| 330 | |
| 331 Note that the collection of metrics can be statically disabled by | |
| 332 setting the :ref:`global configuration option <configuration>` | |
| 333 ``MetricsEnabled`` to ``false``, or dynamically disabled by PUT-ing | |
| 334 ``0`` on ``/tools/metrics``:: | |
| 335 | |
| 336 $ curl http://localhost:8042/tools/metrics | |
| 337 1 | |
| 338 $ curl http://localhost:8042/tools/metrics -X PUT -d '0' | |
| 339 $ curl http://localhost:8042/tools/metrics | |
| 340 0 | |
| 341 | |
| 342 | |
| 343 .. highlight:: yaml | |
| 344 | |
| 345 Here is a sample configuration for Prometheus (in the `YAML format | |
| 346 <https://en.wikipedia.org/wiki/YAML>`__):: | |
| 347 | |
| 348 scrape_configs: | |
| 349 - job_name: 'orthanc' | |
| 350 scrape_interval: 10s | |
| 351 metrics_path: /tools/metrics-prometheus | |
| 352 basic_auth: | |
| 353 username: orthanc | |
| 354 password: orthanc | |
| 355 static_configs: | |
| 356 - targets: ['192.168.0.2:8042'] | |
| 357 | |
| 358 .. highlight:: bash | |
| 359 | |
| 360 Obviously, make sure to adapt this sample with your actual IP | |
| 361 address. Thanks to Docker, you can easily start a Prometheus server by | |
| 362 writing this configuration to, say, ``/tmp/prometheus.yml``, then | |
| 363 type:: | |
| 364 | |
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365 $ sudo run -p 9090:9090 -v /tmp/prometheus.yml:/etc/prometheus/prometheus.yml --rm prom/prometheus:v2.7.0 |