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Python logging library for augmenting log records with additional information

Project description

logaugment
==========

Python logging library for augmenting log records with additional information.

This library supports Python 2.7.x and Python 3.x.

If you want custom keys in your logged string:

.. code:: python

formatter = logging.Formatter("%(message)s: %(custom_key)s")

then this library allows you to add them easily:

.. code:: python

logaugment.add(logger, custom_key='custom_value')
logger.warn("My message")
# My message: custom_value

Note that this call provides a default value for that key. This means you can
safely make logging calls without getting exceptions that the key is missing.
See below if you wish to override the value for a particular logging call.
You should not repeatedly call logaugment.add just to change the value - it's
intended as set-once-and-forget functionality.

You can install the library with pip:

.. code:: bash

$ pip install logaugment

Why?
====

If you need to add custom keys to your Python logging strings you need to pass
them in with each logging call. That is inconvenient so this library allows you
to add values just once and they're then available for all logging calls
afterwards.

Here is a full example:

.. code:: python

import logging

import logaugment

logger = logging.getLogger()
handler = logging.StreamHandler()
formatter = logging.Formatter("%(message)s: %(custom_key)s")
handler.setFormatter(formatter)
logger.addHandler(handler)

logaugment.add(logger, custom_key='custom_value')
logger.warn("My message")
# My message: custom_value

Examples
========

You can use keywords to specify additional values:

.. code:: python

logaugment.add(logger, custom_key='custom_value')
logger.warn("My message")
# My message: custom_value

You can also use a dictionary to specify the keys / values:

.. code:: python

logaugment.add(logger, {'custom_key': 'custom_value'})
logger.warn("My message")
# My message: custom_value

You can also use a function which returns a dictionary:

.. code:: python

def process_record(record):
return {'custom_key': record.levelname}

logaugment.add(logger, process_record)
logger.warn("My message")
# My message: WARNING

You can pass an `extra` dictionary in the call which overrides the
augmented data:

.. code:: python

logaugment.add(logger, {'custom_key': 'custom_value'})
logger.warn("My message", extra={'custom_key': 'extra_value'})
# My message: extra_value

You can use `logaugment.reset` to remove all additional values that
were added using the `logaugment` library:

.. code:: python

logaugment.reset(logger)

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