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https://github.com/Radformation/radmachine-api-examples

Examples of using the RadMachine API presented during the RadMachine Scripting Webinar
https://github.com/Radformation/radmachine-api-examples

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Examples of using the RadMachine API presented during the RadMachine Scripting Webinar

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# RadMachine API Examples



This repository contains a number of examples of using the RadMachine API to

fetch data and perform QA sessions, as originally presented during

Radformation's RadMachine Scripting Webinar.



We hope you find it useful, and if you have other examples you'd like to see,

please file an

[issue](https://github.com/Radformation/radmachine-api-examples/issues) so

we can consider adding it!



## Programming Language Choice



The examples here are mostly written in Python, but you can use whatever

language you want to talk to the API.  Virtually all mainstream languages

(Python, Javascript, Matlab, C#, Ruby, R, VB, ...) have the ability to

serialize & deserialize JSON and make HTTP requests.  Python is a relatively

easy language to read so the examples here should be straightforwrad to convert

to whatever language you're most comfortable with.



If you do convert some of the examples to a different language, please consider

forking this repository, adding your example, and making a pull request so we

can add it here!



## Getting started



All examples should run on any recent Python 3.X version (there is also [one

Javascript example](./examples/01-hello-api/hello.js) which you can run

with [Node JS](https://nodejs.org/en)).  If you don't have Python installed

you can get it here: https://www.python.org/downloads/. Getting started with

Python including how to run these files is outside the scope of this document

but there are many many blog posts, tutorials, and courses available on the

web.  If you get stuck somewhere you can create an [issue in this code

repository](https://github.com/Radformation/radmachine-api-examples/issues) and

we will help you out.



All the examples use the popular

[requests](https://requests.readthedocs.io/en/latest/) library for making HTTP

requests to the RadMachine API.  You will need to [install

it](https://requests.readthedocs.io/en/latest/user/install/#install) prior to

running any of these examples.



The examples are all found in the `examples` subdirectory.  Before running any

example file you will need to edit the file to set your API token and customer

identifier. As a reminder, if you access RadMachine at

https://radmachine.radformation.com/myclinic/, then your customer identifier

would be `myclinic`.  To generate your API token visit your User Profile

(`http://radmachine.radformation.com//accounts/profile/`) page in

RadMachine.



## List of Examples



Please note that for the sake of simplicity most of the examples included here

have eschewed proper error handling.  This is discussed more below in the Best

Practices section.  With that out of the way, the examples are listed below:



* [./examples/01-hello-api/hello.py](./examples/01-hello-api/hello.py)

    * Use the API to fetch a list of all your units and print their names using Python

* [./examples/01-hello-api/hello.js](./examples/01-hello-api/hello.js)

    * Use the API to fetch a list of all your units and print their names using Javascript

* [./examples/02-fetch-test-results/test_results.py](./examples/02-fetch-test-results/test_results.py)

    * Use the API to fetch the most recent results for a specific test performed on a unit.

      Demonstrates filtering and ordering of results

* [./examples/02-fetch-test-results/all_test_results.py](./examples/02-fetch-test-results/all_test_results.py)

    * Use the API to fetch *all* of the results for a specific test performed on a unit

      Demonstrates fetching multiple pages of results

* [./examples/03-performing-qa/ktp.py](./examples/03-performing-qa/ktp.py)

    * Use the API to perform a simple test list with two numerical tests and a calculation.

      Demonstrates basic QA session creation

* [./examples/04-upload-test/upload_text.py](./examples/04-upload-test/upload_text.py)

    * Use the API to perform a test list that requires uploading a text file.

      Demonstrates QA session creation with an upload test

* [./examples/04-upload-test/upload_dicom.py](./examples/04-upload-test/upload_dicom.py)

    * Use the API to perform a test list that requires uploading a dicom file.

      Demonstrates Base 64 encoding a binary file for upload

* [./examples/05-reports/qa_session_report.py](./examples/05-reports/qa_session_report.py)

    * Use the API to download a report for a specific QA Session

* [./examples/05-reports/saved_reports.py](./examples/05-reports/saved_reports.py)

    * Use the API to run all of your saved reports

* [./examples/06-qa-repeater/qa-repeater.py](./examples/06-qa-repeater/qarepeater.py)

    * A QARepeater class that demonstrates how to perform a constancy check using the API



## API Usage Best Practices



### Tokens



Because someone in posession of your API token can take actions on your behalf,

they should be considered sensitive and treated in a manner similar to

passwords.  When possible we recommend creating a specific RadMachine "API User"

with a limited amount of permissions.  RadMachine has two built in User Groups

"API Performer" and "API ReadOnly" which can be useful for this purpose (if

these groups are not present in your instance, please contact support and they

will be happy to add them).



You may revoke your existing token and regenerate a new unique token at any

time by visiting your User Profile page.



### Status codes & Error handling



As mentioned above, most of the included example scripts have intentionally

avoided handling error conditions in favour of brevity & simplicity.  It is

just about guaranteed that when dealing with network requests (and in our

experience, hospital networks in particular!) you will encounter flaky

interent connections, proxy issues, server errors and more.  Given that, if you

are writing a script or application you are going to deploy in the clinic it is

well worth taking the time to consider potential error conditions and handling

them as gracefully as possible



In general you will encounter 4 classes of HTTP response status codes:



* 2XX - Everything went according to plan!

* 3XX - The resource you are trying to reach has been moved

* 4XX - Typically indicates something is wrong with your request

* 5XX - Your request generated an error on the server (often an indication of a bug on our side)



In RadMachine the most common status codes you will encounter are:



* 200 - Your request to fetch some data, or update an existing object, was successful

* 201 - Your request to create a new object on the server (e.g. a QA Session) was successful

* 400 - Usually received when there is a problem with the data in your request to create a new QA session

* 401 - You forgot to include your authentication header or your token was invalid

* 403 - Your user does not have permission to access the resource you are trying to reach

* 500 - Your request generated an error on the server



An example of handling different status codes when attempting to create a QA

session with the RadMachine API might look like:



```

import requests

s = requests.Session()



...



resp = s.post(url, json=data)

if resp.status_code >= 500:

    print("server error. Contact support!")

elif resp.status_code >= 400:

    print("Something wrong with our request.", resp.json())

elif resp.status_code == 201:

    print("QA Session created!", resp.json())

```



### Limit your requests



When dealing with API's it is generally a good idea to be a considerate user by

not flooding the server with requests.  It depends on the API you are dealing

with but generally, inserting a pause of 0.5s - 1s should be adequate. For

example:



```python

    # hammer the server!

    while True: # :(

        response = s.get(url)



    # that's more like it!

    while True: # :)

        response = s.get(url)

        time.sleep(0.5)

```



You should also be conscious of not repeating requests unnecessarily.  Making

use of caches and removing redundant API calls can make your program run faster

and keep the API servers happy. For example:



```python

    tests = ["6MV Output", "10MV Output"]

    units = ["Unit 1", "Unit 2"]



    # test details gest called every loop but never changes :(

    for unit in units:

        test_details = s.get(".../qa/tests/", params={"name__in": tests}) # :(

        unit = s.get(".../units/units/", params={"name": unit})



    # move the redundant call out of the loop

    test_details = s.get(".../qa/tests/", params={"name__in": tests}) # :)

    for unit in units:

        unit = s.get(".../units/units/", params={"name": unit})



```