Sanic: run async，how to set workers

[dangerousfeng]

from sanic import Sanic
from sanic import response
from signal import signal, SIGINT
import asyncio
import uvloop

app = Sanic(__name__)

@app.route("/")
async def test(request):
return response.json({"answer": "42"})

asyncio.set_event_loop(uvloop.new_event_loop())
server = app.create_server(host="0.0.0.0", port=8000)
loop = asyncio.get_event_loop()
task = asyncio.ensure_future(server)
signal(SIGINT, lambda s, f: loop.stop())
try:
loop.run_forever()
except:
loop.stop()

in this example,I want to set workers=4. just like "app.run(host="0.0.0.0", port=5000, workers=4)",but app.create_server() not support workers

[jrocketfingers]

If I understand this correctly, you want to have an option to add signal handlers? Unless you have some specific logic that needs to be added (though I don't see what could that be) you should just rely on run.

The example you're trying to achieve is already handled for you within sanic's run. https://github.com/channelcat/sanic/blob/master/sanic/server.py#L590-L597

[ashleysommer]

Any reason you can't just use app.run?

It literally does all of that for you.

[dangerousfeng]

app.run support async? i don't know hao to do it.

[ashleysommer]

Im not entirely sure what you're asking, but yes,app.run() supports async route handlers, and async middleware.

Read the README file for a small example.

Read the documentation for more examples:
http://sanic.readthedocs.io/en/latest/

This is a very minimal example:

from sanic import Sanic
from sanic.response import text

app = Sanic()

@app.route("/")
async def index(request):
    return text("hello world")

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=8000)

[r0fls]

If you want to use the workers feature, you'll have to use app.run. To add other async tasks to the same loop, you can use app.add_task before calling app.run:

async def notify_server_started_after_five_seconds():
    await asyncio.sleep(5)
    print('Server successfully started!')

app.add_task(notify_server_started_after_five_seconds())

Or use the listeners to start your task at the appropriate time. There's more info here: http://sanic.readthedocs.io/en/latest/sanic/middleware.html?highlight=add_task.

I'm going to close this, since running multiple workers isn't supported with app.create_server, and it's a known limitation. However feel free to reopen and/or reploy if you would like to discuss it further.