aioratelimiter

A simple Python AsyncIO rate limiter.

Installation

pip install aioratelimiter

Sample Usage

# Limit to 10 requests per 5 second (equiv to 2 requests per second)
>>> limiter = aioratelimiter.Limiter(10/5)
>>> async def main():
...     await limiter.wait() # Wait for a slot to be available.
...     pass # do stuff

>>> limiter = Limiter(1/3)
>>> async def request():
...     await limiter.wait()
...     print("Request")  # Do stuff
...
>>> async def main():
...     # Schedule 1 request every 3 seconds.
...     await asyncio.gather(*(request() for _ in range(10)))

Available Limiter flavors

• Limiter: Limits by requests per second and takes into account CPU heavy tasks or other delays that can occur while the process is sleeping.
• LeakyBucketLimiter: Limits by requests per second according to the leaky bucket algorithm. Has a maximum capacity and an initial burst of requests.
• StrictLimiter: Limits by requests per second, without taking CPU or other process sleeps into account. There are no bursts and the resulting rate will always be a less than the set limit.

Documentation

Full documentation available on Read the Docs.

License

Licensed under the MIT License.