Quart-Rate-Limiter

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Quart-Rate-Limiter is an extension for Quart <https://github.com/pgjones/quart> to allow for rate limits to be defined and enforced on a per route basis. The 429 error response includes a RFC7231 <https://tools.ietf.org/html/rfc7231#section-7.1.3> compliant Retry-After header and the successful responses contain headers compliant with the RateLimit Header Fields for HTTP <https://tools.ietf.org/html/draft-polli-ratelimit-headers-00>_ RFC draft.

Quickstart

To add a rate limit first initialise the RateLimiting extension with the application, and then rate limit the route,

.. code-block:: python

app = Quart(__name__)
rate_limiter = RateLimiter(app)

@app.get('/')
@rate_limit(1, timedelta(seconds=10))
async def handler():
    ...

Simple examples

To limit a route to 1 request per second and a maximum of 20 per minute,

.. code-block:: python

    @app.route('/')
    @rate_limit(1, timedelta(seconds=1))
    @rate_limit(20, timedelta(minutes=1))
    async def handler():
        ...

Alternatively the ``limits`` argument can be used for multiple limits,

.. code-block:: python

    @app.route('/')
    @rate_limit(
        limits=[
            RateLimit(1, timedelta(seconds=1)),
            RateLimit(20, timedelta(minutes=1)),
        ],
    )
    async def handler():
        ...

To identify remote users based on their authentication ID, rather than
their IP,

.. code-block:: python

    async def key_function():
        return current_user.id

    RateLimiter(app, key_function=key_function)

The ``key_function`` is a coroutine function to allow session lookups
if appropriate.

Contributing
------------

Quart-Rate-Limiter is developed on `GitHub
<https://github.com/pgjones/quart-rate-limiter>`_. You are very welcome to
open `issues <https://github.com/pgjones/quart-rate-limiter/issues>`_ or
propose `merge requests
<https://github.com/pgjones/quart-rate-limiter/merge_requests>`_.

Testing

The best way to test Quart-Rate-Limiter is with Tox,

.. code-block:: console

$ pip install tox
$ tox

this will check the code style and run the tests.

Help

The Quart-Rate-Limiter documentation <https://quart-rate-limiter.readthedocs.io/en/latest/> is the best places to start, after that try searching stack overflow <https://stackoverflow.com/questions/tagged/quart> or ask for help on gitter <https://gitter.im/python-quart/lobby>. If you still can't find an answer please open an issue <https://github.com/pgjones/quart-rate-limiter/issues>.

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