Python3 ASGI Quick Start

Quick start template repository for Python 3 using ASGI

WSGI vs ASGI

• WSGI: Web Server Gateway Interface
• ASGI: Asynchronous Server Gateway Interface

ASGI is pretty much a superset of WSGI

ASGI includes asynchronous serving methods while WSGI does not.

WSGI applications are a single, synchronous callable that takes a request and returns a response; this doesn’t allow for long-lived connections, like you get with long-poll HTTP or WebSocket connections.

Even if we made this callable asynchronous, it still only has a single path to provide a request, so protocols that have multiple incoming events (like receiving WebSocket frames) can’t trigger this.

Concepts

You can read more on this per the following link: Full ASGI PDF Documentation

Frameworks

FastAPI

• Asynchronous
• Performance
  • Official Document on Performance
  • TechEmpower Benchmark Comparison [Python]
• Easy to use
• Well documented

Development

$ gunicorn main:app -k uvicorn.workers.UvicornWorker -c uvicorn.conf.py --reload
[YYYY-MM-DD 00:00:00 +0000] [PID] [INFO] Starting gunicorn X.X.X
[YYYY-MM-DD 00:00:00 +0000] [PID] [INFO] Listening at: http://0.0.0.0:8000 (PID)
[YYYY-MM-DD 00:00:00 +0000] [PID] [INFO] Using worker: uvicorn.workers.UvicornWorker

Using gunicorn as process manager and uvicorn worker, the ASGI server is able to detect a change on Python code and automatically reload the server based on changes.

Dependency Management

There're modern dependency management for Python

Pip

TODO: Added content for pip

Pipenv

TODO: Added content for pipenv

Poetry

TODO: Added content for poetry

Deployment

For the deployment process, this repository includes 3 prototypes which are production ready. All of prototypes are based on GoogleContainerTools/distroless container images.

With introduction of Python 3.9, distroless has not yet upgrade their Python to the current stable yet (currenly at 3.7), I've used slim-buster as an alternative for now until the distroless registry has caught up.