Test Python Google Cloud Functions locally

Question

I'm trying out the Python3.7 runtime on Google Cloud Functions. I am able to deploy the functions and make them work once deployed, however, I can't seem to run the emulator to test them locally before I deploy.

Google's documentation is a little inconsistent where they tell you to install the google functions emulator here: https://cloud.google.com/functions/docs/emulator

But over on Firebase they tell you to npm install firebase-admin, firebase-tools and firebase-functions.

All of the emulator documentation references examples written in JS, none in Python so I'm wondering if these emulator even run Python functions locally?

Thanks

Answer 1

You can use the Functions Framework for Python to run the function locally.

Given a function in a file named main.py like so:

def my_function(request):     return 'Hello World' 

You can do:

$ pip install functions-framework $ functions-framework --target my_function 

Which will start a local development server at http://localhost:8080.

To invoke it locally for an HTTP function:

$ curl http://localhost:8080 

For a background function with non-binary data:

$ curl -d '{"data": {"hi": "there"}}' -X POST \ -H "Content-Type: application/json" \ http://localhost:8080 

For a background function with binary data:

$ curl -d "@binary_file.file" -X POST \ -H "Ce-Type: true" \ -H "Ce-Specversion: true" \ -H "Ce-Source: true" \ -H "Ce-Id: true" \ -H "Content-Type: application/json" \ http://localhost:8080