blivechat/utils/rate_limit.py
2023-11-26 15:50:12 +08:00

33 lines
1.2 KiB
Python

# -*- coding: utf-8 -*-
import datetime
import logging
logger = logging.getLogger(__name__)
class TokenBucket:
def __init__(self, tokens_per_sec, max_token_num):
self._tokens_per_sec = float(tokens_per_sec)
self._max_token_num = float(max_token_num)
self._stored_token_num = self._max_token_num
self._last_update_time = datetime.datetime.now()
if self._tokens_per_sec <= 0.0 and self._max_token_num >= 1.0:
logger.warning('TokenBucket token_per_sec=%f <= 0, rate has no limit', tokens_per_sec)
def try_decrease_token(self):
if self._tokens_per_sec <= 0.0:
# self._max_token_num < 1.0 时完全禁止
return self._max_token_num >= 1.0
cur_time = datetime.datetime.now()
last_update_time = min(self._last_update_time, cur_time) # 防止时钟回拨
add_token_num = (cur_time - last_update_time).total_seconds() * self._tokens_per_sec
self._stored_token_num = min(self._stored_token_num + add_token_num, self._max_token_num)
self._last_update_time = cur_time
if self._stored_token_num < 1.0:
return False
self._stored_token_num -= 1.0
return True