Pacemaker - Rate limit library. Currently implemented rate limits are

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Network pacemaker
Overview

PaceMaker

Rate limit library. Currently implemented rate limits are

Fixed window rate limit

Fixed window limits—such as 3,000 requests per hour or 10 requests per day—are easy to state, but they are subject to spikes at the edges of the window, as available quota resets. Consider, for example, a limit of 3,000 requests per hour, which still allows for a spike of all 3,000 requests to be made in the first minute of the hour, which might overwhelm the service.

Starts counting time windows when the first request arrives.

Fixed truncated window rate limit

Same as Fixed Window rate limit but truncates the rate limit window to the rate interval configured in order to adjust to real time intervals passing. E.g:

  1. Rate limit interval is configured for new windows every 10 seconds
  2. First request arrives at 2022-02-05 10:23:23
  3. Current rate limit window: from 2022-02-05 10:23:20 to 2022-02-05 10:23:30

You can refer to google architecture docs to read more about rate limits.

TODO:

  • Fixed window bucket variant (refill token with capacity at same rate)
  • Redis storage
  • Token bucket
  • Leaky bucket
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Comments
  • feat: prevent increasing counter state

    feat: prevent increasing counter state

    Prior to this commit when employing the 'Try' interface, if the call incurred in rate limit, the state counter accumulated payload tokens unnecessarily, making the 'Check' interface to return unexpected values.

    opened by sonirico 0
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