Overview

Sanic 22.6, released on July 1, 2022, adds background tasks and middleware priority.

Main Features

Background tasks

Background tasks execute asynchronous code independently from the request/response cycle, useful for periodic tasks.

python 
from sanic import Sanic
import asyncio

app = Sanic('MyApp')

@app.before_server_start
async def setup(app, loop):
    app.add_task(periodic_task())

async def periodic_task():
    while True:
        print('Checking...')
        await asyncio.sleep(60)

Middleware priority

Middlewares can now be ordered by priority, providing fine-grained control over execution order.

python 
from sanic import Sanic

app = Sanic('MyApp')

@app.middleware('request', priority=10)
async def auth_middleware(request):
    # Executed first (high priority)
    pass

@app.middleware('request', priority=1)
async def log_middleware(request):
    # Executed after auth (low priority)
    print(f'{request.method} {request.path}')

Sources