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.. _aiohttp-logging:
Logging
=======
.. currentmodule:: aiohttp
*aiohttp* uses standard :mod:`logging` for tracking the
library activity.
We have the following loggers enumerated by names:
- ``'aiohttp.access'``
- ``'aiohttp.client'``
- ``'aiohttp.internal'``
- ``'aiohttp.server'``
- ``'aiohttp.web'``
- ``'aiohttp.websocket'``
You may subscribe to these loggers for getting logging messages. The
page does not provide instructions for logging subscribing while the
most friendly method is :func:`logging.config.dictConfig` for
configuring whole loggers in your application.
Logging does not work out of the box. It requires at least minimal ``'logging'``
configuration.
Example of minimal working logger setup::
import logging
from aiohttp import web
app = web.Application()
logging.basicConfig(level=logging.DEBUG)
web.run_app(app, port=5000)
.. versionadded:: 4.0.0
Access logs
-----------
Access logs are enabled by default. If the `debug` flag is set, and the default
logger ``'aiohttp.access'`` is used, access logs will be output to
:obj:`~sys.stderr` if no handlers are attached.
Furthermore, if the default logger has no log level set, the log level will be
set to :obj:`logging.DEBUG`.
This logging may be controlled by :meth:`aiohttp.web.AppRunner` and
:func:`aiohttp.web.run_app`.
To override the default logger, pass an instance of :class:`logging.Logger` to
override the default logger.
.. note::
Use ``web.run_app(app, access_log=None)`` to disable access logs.
In addition, *access_log_format* may be used to specify the log format.
.. _aiohttp-logging-access-log-format-spec:
Format specification
^^^^^^^^^^^^^^^^^^^^
The library provides custom micro-language to specifying info about
request and response:
+--------------+---------------------------------------------------------+
| Option | Meaning |
+==============+=========================================================+
| ``%%`` | The percent sign |
+--------------+---------------------------------------------------------+
| ``%a`` | Remote IP-address |
| | (IP-address of proxy if using reverse proxy) |
+--------------+---------------------------------------------------------+
| ``%t`` | Time when the request was started to process |
+--------------+---------------------------------------------------------+
| ``%P`` | The process ID of the child that serviced the request |
+--------------+---------------------------------------------------------+
| ``%r`` | First line of request |
+--------------+---------------------------------------------------------+
| ``%s`` | Response status code |
+--------------+---------------------------------------------------------+
| ``%b`` | Size of response in bytes, including HTTP headers |
+--------------+---------------------------------------------------------+
| ``%T`` | The time taken to serve the request, in seconds |
+--------------+---------------------------------------------------------+
| ``%Tf`` | The time taken to serve the request, in seconds |
| | with fraction in %.06f format |
+--------------+---------------------------------------------------------+
| ``%D`` | The time taken to serve the request, in microseconds |
+--------------+---------------------------------------------------------+
| ``%{FOO}i`` | ``request.headers['FOO']`` |
+--------------+---------------------------------------------------------+
| ``%{FOO}o`` | ``response.headers['FOO']`` |
+--------------+---------------------------------------------------------+
The default access log format is::
'%a %t "%r" %s %b "%{Referer}i" "%{User-Agent}i"'
.. versionadded:: 2.3.0
*access_log_class* introduced.
Example of a drop-in replacement for the default access logger::
from aiohttp.abc import AbstractAccessLogger
class AccessLogger(AbstractAccessLogger):
def log(self, request, response, time):
self.logger.info(f'{request.remote} '
f'"{request.method} {request.path} '
f'done in {time}s: {response.status}')
.. _gunicorn-accesslog:
Gunicorn access logs
^^^^^^^^^^^^^^^^^^^^
When `Gunicorn <http://docs.gunicorn.org/en/latest/index.html>`_ is used for
:ref:`deployment <aiohttp-deployment-gunicorn>`, its default access log format
will be automatically replaced with the default aiohttp's access log format.
If Gunicorn's option access_logformat_ is
specified explicitly, it should use aiohttp's format specification.
Gunicorn's access log works only if accesslog_ is specified explicitly in your
config or as a command line option.
This configuration can be either a path or ``'-'``. If the application uses
a custom logging setup intercepting the ``'gunicorn.access'`` logger,
accesslog_ should be set to ``'-'`` to prevent Gunicorn to create an empty
access log file upon every startup.
Error logs
----------
:mod:`aiohttp.web` uses a logger named ``'aiohttp.server'`` to store errors
given on web requests handling.
This log is enabled by default.
To use a different logger name, pass *logger* (:class:`logging.Logger`
instance) to the :meth:`aiohttp.web.AppRunner` constructor.
.. _access_logformat:
http://docs.gunicorn.org/en/stable/settings.html#access-log-format
.. _accesslog:
http://docs.gunicorn.org/en/stable/settings.html#accesslog
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