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Running Serverless Django on Azure Functions

Here we want to run our Django app serverless on Azure Functions.

Setup

You need to install various dependencies for this video. Best bet is to walk through at least the local developement steps of the Python in Azure Functions Quickstart.

Then install the VS Code Azure Functions extension.

If you checkout the azure/4-functions branch of the repo the project is already set up ready to run in functions.

  • The project is already initialised.

    func init —worker-runtime=python

    The VS Code Azure Functions extension has a command that will guide you through this step.

  • The serverless folder containing the function code is already in place and configured to use an Http Trigger, i.e. to respond to web requests.

    func new

    Again you can create a new function using the VS Code extension.

  • In serverless/function.json, we configure the route to capture the entire path after the base URL:

    "route": "serverless/{*path_info}",

    This gets passed to Django as the WSGI PATH_INFO value, which Django will use to route the request to the correct view function.

Then inside serverless/__init__.py we use the wsgi_adapter code to map Azure functions HTTP request and response objects to WSGI request and responses that Django can understand.

  • We import our Django app´s WSGI handler and wrap it in the adapter:

    from wsgi_adapter import AzureWSGIHandler
from tutorial.wsgi import application
azure_application = AzureWSGIHandler(application)

  • Then in our function´s main(), we pass in the func.HttpRequest and get back a func.HttpResponse.

    def main(req: func.HttpRequest) -> func.HttpResponse:
    response: func.HttpResponse = azure_application(req)
    return response

    The AzureWSGIHandler maps between the functions and the WSGI environments. The actual request handling is still performed by Django.

Note

Everything here is somewhat experimental. It is using wrapper code available in my azure-functions-wsgi-adapter repository, and via pip install azure-functions-wsgi-adapter.

The WSGI Adapter is still work in progress: if you´re interested in this, do stop by to help me finish it!