Show requests log in terminal

[cyantarek]

Long story short

I want the log display in terminal feature like django

Expected behaviour

When running "python main.py", any hit on URL endpoint should log the info in the terminal.

For example:

======== Running on http://0.0.0.0:8095 ========
(Press CTRL+C to quit)
[21:36:52] 127.0.0.1 [23/Apr/2018:15:36:52 +0000] "GET / HTTP/1.1" 200 183 "-" "PostmanRuntime/6.4.1"

Actual behaviour

No log info display

Your environment

Windows 8.1, 64 Bit, Python 3.6

[asvetlov]

You need to setup access logger: https://docs.aiohttp.org/en/stable/logging.html#access-logs

All-logging-by-default is too annoying, that's why aiohttp has a separate API for it

[cyantarek]

Well, after that, will it be shown in terminal for each requests?

[drpoggi]

Well, after that, will it be shown in terminal for each requests?

Yes.

[cyantarek]

I'm new to aiohttp, can you show me how to configure that?

[asvetlov]

The question is out of aiohttp scope.
Perhaps you should learn about Python logging: https://docs.python.org/3/library/logging.html#logging.basicConfig

[scherrey]

Actually your aiohttp logging docs implies there's extra stuff or a best practice to do logging for aiohttp apps and thus creates confusion for the issue. I just ran into the exact same issue, especially since the documentation actually explicitly says logging is turned on by default but nothing comes out. And anyone who has ever written a web server or was working to get familiar with a web framework has needed this ability for initial tests/debugging - so an example of the simplest way to turn this on for web development would actually be quite valuable in the documentation. I thought for a moment that the logging utilities might be implemented as a context or something but that doesn't seem to be the case.

[scherrey]

For debugging purposes, I made this little bash command that will run my app (listing_server.listing_app) with debug logging turned on. It should make it obvious how to use basic logging in an aiohttp server context.

python -c "import logging; from aiohttp import web; from listing_server import *; logging.basicConfig(level=logging.DEBUG); web.run_app(listing_app);"

[asvetlov]

Logging setup is a very complicated question: different apps require different settings.
For example, one app wants logging rotation, another stores logs into logstash for ELK stack etc. etc.
Pushing everything into run_app makes a mess very easily.

If you have an idea for documentation improvement -- please make a Pull Request.

[xen]

Actually, access log to the stdout is standard for any HTTP servers.

[asvetlov]

Really?
IIRC flask requires explicit logging system setup like aiohttp: http://flask.pocoo.org/docs/1.0/logging/

[webknjaz]

AFAIR flask prints out access logs too

[asvetlov]

Aha, http://flask.pocoo.org/docs/1.0/logging/#default-configuration
Flask adds StreamHandler to application logger if the logger has no handlers at the moment of application startup.
We can do the same in web.run_app. AppRunner should be configured explicitly.

[sjatkins]

No real answer is given. Or none that is intelligible to this reader. Give clear minimal instructions for running your web app with access logging please.

[ixje]

Here's an example that worked for my situation

import logging

stdio_handler = logging.StreamHandler()
stdio_handler.setLevel(logging.INFO)
_logger = logging.getLogger('aiohttp.access')
_logger.addHandler(stdio_handler)
_logger.setLevel(logging.DEBUG)

app = web.Application(logger=_logger)
runner = web.AppRunner(app)
await runner.setup()
site = web.TCPSite(runner, args.host, args.port_rpc)
await site.start()

and the output now includes lines like

127.0.0.1 [09/Apr/2019:10:59:18 +0000] "POST / HTTP/1.1" 200 272 "-" "PostmanRuntime/7.6.1"

[NewUserHa]

hope there's a document enhancement or an aiohttp enhancement for this.
thanks you

[asvetlov]

Champion is welcome!

[NewUserHa]

I have no idea how to modify aiohttp to behavior like others like flask. maybe use ixje's comment?
if you don't mind, I can PR a document enhancement about 'logging.basicConfig()' that you comment in another issue.

ps. the PR for debug flag to run_app cant pass test. do you have any idea?
thanks