|
| 1 | +from functools import wraps |
| 2 | +from time import sleep, time |
| 3 | + |
| 4 | +DEFAULT_MAX_REQUESTS_PER_MINUTE = None |
| 5 | +DEFAULT_MIN_SLEEP_PER_REQUEST = 0 |
| 6 | +SECONDS_IN_MINUTE = 60 |
| 7 | + |
| 8 | + |
| 9 | +def rate_limiter(func): |
| 10 | + """ |
| 11 | + Decorator that applies rate limiting to a function. |
| 12 | +
|
| 13 | + Parameters in the decorated function: |
| 14 | + max_requests_per_minute: <int> The maximum number of requests that can be made |
| 15 | + in a minute. If None, there is no limit. |
| 16 | + min_sleep_per_request: <float> The minimum time to wait between requests. |
| 17 | +
|
| 18 | + Usage: |
| 19 | + >>> @rate_limiter() |
| 20 | + ... def my_function(param1, param2): |
| 21 | + ... pass |
| 22 | + ... my_function(1, 2, max_requests_per_minute=10, min_sleep_per_request=0.1) |
| 23 | + ... # The function will be called at most 10 times per minute |
| 24 | + ... # with at least 0.1 seconds between each call |
| 25 | + """ |
| 26 | + requests_per_minute = 0 |
| 27 | + last_reset_time = time() |
| 28 | + |
| 29 | + @wraps(func) |
| 30 | + def wrapper(*args, **kwargs): |
| 31 | + max_requests_per_minute = kwargs.pop( |
| 32 | + "max_requests_per_minute", DEFAULT_MAX_REQUESTS_PER_MINUTE |
| 33 | + ) |
| 34 | + min_sleep_per_request = kwargs.pop( |
| 35 | + "min_sleep_per_request", DEFAULT_MIN_SLEEP_PER_REQUEST |
| 36 | + ) |
| 37 | + nonlocal requests_per_minute, last_reset_time |
| 38 | + |
| 39 | + current_time = time() |
| 40 | + elapsed_time = current_time - last_reset_time |
| 41 | + |
| 42 | + if elapsed_time < SECONDS_IN_MINUTE: |
| 43 | + requests_per_minute += 1 |
| 44 | + if ( |
| 45 | + max_requests_per_minute is not None |
| 46 | + and requests_per_minute > max_requests_per_minute |
| 47 | + ): |
| 48 | + |
| 49 | + sleep(SECONDS_IN_MINUTE - elapsed_time) |
| 50 | + requests_per_minute = 0 |
| 51 | + last_reset_time = time() |
| 52 | + else: |
| 53 | + requests_per_minute = 0 |
| 54 | + last_reset_time = current_time |
| 55 | + |
| 56 | + sleep(min_sleep_per_request) |
| 57 | + return func(*args, **kwargs) |
| 58 | + |
| 59 | + return wrapper |
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