aiohttp how to log access log?

Question

I am trying to get a basic logger for aiohttp working, but there are simply no log messages being logged. Note_ logging custom messages works as expected.

async def main_page(request: web.Request):
    return "hello world"

def setup_routes(app):
    app.router.add_get('/', main_page)


async def init(loop):
    # load config from yaml file in current dir
    conf = load_config(str(pathlib.Path('.') / 'async_config.yml'))

    # setup application and extensions
    app = web.Application(loop=loop)

    # setup views and routes
    setup_routes(app)

    host, port = conf['host'], conf['port']

    app['gmt_file'] = _get_gmt_file()

    return app, host, port

    LOG_FORMAT = '%a %l %u %t "%r" %s %b "%{Referrer}i" "%{User-Agent}i"'
    log_file = "log.text"
    handler = handlers.TimedRotatingFileHandler(log_file, when='midnight',
                                                backupCount=5)

    handler.setLevel(logging.DEBUG)
    formatter = logging.Formatter(LOG_FORMAT)
    handler.setFormatter(formatter)
    handler.name = "file_log"

    loop = asyncio.get_event_loop()
    app, host, port = loop.run_until_complete(init(loop))

    logging.getLogger("aiohttp").addHandler(handler)

    # todo host ziehen per aiohttp methods, so we are externally visible.
    web.run_app(app, host=host, port=port)

Answer 1

Simply import logging and add

logging.basicConfig(level=logging.DEBUG)

somewhere before your run_app call.

Answer 2

LOG_FORMAT should be "%s" if any. '%a %l %u %t "%r" %s %b "%{Referrer}i" "%{User-Agent}i"' is a valid parameter for .make_handler(access_log_format=...) call, not logging.Formatter.

As first step I suggest setting up root logger and after that going down to error/access logs. Perhaps access log worth own private file like access.log. To achieving this you need to setup a handler for aiohttp.access logger, not for top-level aiohttp.