Extra logging functionality for Flask applications
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README.rst

Flask-Logging-Extras
====================

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Flask-Logging-Extras adds additional logging features for Flask applications.

Extra keywords in the log formatters
------------------------------------

Adding extra keywords to the log format message is a bit tedious, as these
must be supplied to the logging methods in the `extra` argument as a
dictionary.

Flask-Logging-Extras makes this easier, so you can add such keywords to the
logging methods directly. The example adds the category keyword to the logs,
and shows how to do it with and without Flask-Logging-Extras:

.. code-block:: python

fmt = '[%(asctime)s] [%(levelname)s] [%(category)s] %(message'
# Initialize log handlers as usual, like creating a FileHandler, and
# assign fmt to it as a format string
app.config['FLASK_LOGGING_EXTRAS_KEYWORDS'] = {'category': '<unset>'}
app.logger.init_app(app)

# Without Flask-Logging-Extras
current_app.logger.info('this is a the message, as usual',
extra={'category': 'fancy-category'})
# With Flask-Logging-Extras
current_app.logger.info('this is the message, as usual',
category='fancy-category')

Logging the blueprint name
--------------------------

Although you can always access the blueprint name using `request.blueprint`,
adding it to the logs as a new keyword is not so easy.

With Flask-Logging-Extras you can specify a keyword that will hold the
blueprint name in the logs, and specify what value to put there if the log
doesn’t originate in a request, or it is not from a blueprint route, but
from an app route.

.. code-block:: python

fmt = '[%(blueprint)s] %(message)s'
# Initialize log handlers as usual, like creating a FileHandler, and
# assign fmt to it as a format string
app.config['FLASK_LOGGING_EXTRAS_BLUEPRINT'] = (
'blueprint',
'<APP>',
'<NO REQUEST>',
)

bp = Blueprint('bpname', __name__)
app.register_blueprint(bp)

@app.route('/route/1/')
def route_1():
# This will produce the log message: "[<APP>] Message"
current_app.logger.info('Message')

return 'response 1'

@bp.route('/route/2/')
def route_2():
# This will produce the log message: "[bpname] Message"
current_app.logger.info('Message')

return 'response 2'

def random_function_outside_of_a_request():
# This will produce the log message: "[<NO REQUEST>] Message"
current_app.logger.info('Message')

Installation
------------

The easiest way to start using the package is with pip:

.. code-block:: sh

$ pip install Flask-Logging-Extras

If you prefer to install from source, you can clone this repo and run

.. code-block:: sh

$ python setup.py install

Usage
-----

`View the documentation online
<http://flask-logging-extras.readthedocs.io/>`_

Testing and Code Coverage
-------------------------

We require 100% code coverage in our unit tests. We run all the unit tests
with tox, which will test against python2.7, 3.3, 3.4, and 3.5.

Running tox will print out a code coverage report. Coverage report is also
available on codecov.

tox is running automatically for every push in Travis-CI. To run tox on
your local machine, you can simply invoke it with the `tox` command.

Generating Documentation
------------------------

You can generate a local copy of the documentation. First, make sure you
have the flask sphinx theme available. You can get it (and all possible
documentation requirements) with

.. code-block:: sh

$ pip install -r docs-requirements.txt

Then in the `docs/` directory, run

.. code-block:: sh

$ make clean && make html

License
-------

This module is available under the MIT license.