Metadata-Version: 2.1
Name: Function-Limiter
Version: 0.1
Summary: Rate limiting for callable functions
Home-page: https://github.com/mghorbani2357/Function-Limiter
Author: Mohsen Ghorbani
Author-email: m.ghorbani2357@gmail.com
License: MIT
Platform: UNKNOWN
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Operating System :: MacOS
Classifier: Operating System :: POSIX :: Linux
Classifier: Operating System :: OS Independent
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Programming Language :: Python :: Implementation :: PyPy
Description-Content-Type: text/x-rst
License-File: LICENSE
Requires-Dist: redis (~=3.5.3)

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Function-Limiter
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Function-Limiter provides call rate limitation of callable function.

Installation
============

.. code-block:: bash

    pip install Function-Limiter


Quick Start
===========

Add the rate limiter to your function as decorator. The following example uses the default
in memory implementation. ``Limiter()`` create instance of limiter.
By using ``limiter.limit()`` call rate of callable function become limited.
``limiter.limit(limitation, key)`` limitation get the limitation can be assigned number per one of these keywords (second, minute, hour, day, month, year).
Limitation applied on defined key.


.. code-block:: python

    from function_limiter.limiter import Limiter
    from function_limiter.limiter import RateLimitExceeded
    import time

    limiter = Limiter()


    @limiter.limit('3/second', 'key')
    def function():
        print('hello world!')



.. code-block:: python

    from function_limiter.limiter import Limiter
    from function_limiter.limiter import RateLimitExceeded
    import time

    storage_uri = 'redis://ip:port/'
    limiter = Limiter(
            storage_uri=storage_uri
        )


There are a few ways of using this decorator depending on your preference and use-case.


Single decorator
================

The limit string can be a single limit or a delimiter separated string

.. code-block:: python

    @limiter.limit('3/second;10 per minute', 'key')
    def function():
        print('hello world!')


Custom keying function
======================

You can implement your own function to retrieve the value of rate limit config.

.. code-block:: python

    def limitation():
        return '5/second'

    def key():
        return 'custom key'

    @limiter.limit(limitation, key=key)
    def function():
        print('hello world!')



Redis storage
======================

Redis storage can be involved to lunch multiple instance of application.

.. code-block:: python

    limiter = Limiter(
        storage_uri='redis://ip:port/'
    )

    @limiter.limit('3/minute', 'key')
    def func():
        pass


Exempt key
======================

Exempt key can be used to exempt defined keys. If key and exempt key matched it ignores the limitations

.. code-block:: python

    limiter = Limiter()

    @limiter.limit('3/minute', 'key', exempt='key')
    def func():
        pass

Default values
===============

You can define rate limit default value when the Limiter instance was initialized.
By defining default rate limit values if there isn't any value for the specific key it applies the default value.

.. code-block:: python

    limiter = Limiter(
        default_limitations='3/minute',
        default_key='key',
        default_exempt='key'
    )

    @limiter.limit()
    def func():
        pass


Limitation reset
=================

Limitation can be reset for specific key.

.. code-block:: python

    limiter = Limiter()

    @limiter.limit('3 per second', 'key')
    def func():
        pass

    for _ in range(3):
       func()

    limiter.reset('key')

    for _ in range(3):
       func()



