sanic/examples/limit_concurrency.py

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from sanic import Sanic
from sanic.response import json
import asyncio
import aiohttp
app = Sanic(__name__)
sem = None
@app.listener('before_server_start')
def init(sanic, loop):
global sem
concurrency_per_worker = 4
sem = asyncio.Semaphore(concurrency_per_worker, loop=loop)
async def bounded_fetch(session, url):
"""
Use session object to perform 'get' request on url
"""
async with sem, session.get(url) as response:
return await response.json()
@app.route("/")
async def test(request):
"""
Download and serve example JSON
"""
url = "https://api.github.com/repos/channelcat/sanic"
async with aiohttp.ClientSession() as session:
response = await bounded_fetch(session, url)
return json(response)
app.run(host="0.0.0.0", port=8000, workers=2)