freqtrade_origin/freqtrade/util/periodic_cache.py

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from datetime import datetime, timezone
from cachetools import TTLCache
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class PeriodicCache(TTLCache):
"""
Special cache that expires at "straight" times
A timer with ttl of 3600 (1h) will expire at every full hour (:00).
"""
def __init__(self, maxsize, ttl, getsizeof=None):
def local_timer():
ts = datetime.now(timezone.utc).timestamp()
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offset = ts % ttl
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return ts - offset
# Init with smlight offset
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super().__init__(maxsize=maxsize, ttl=ttl - 1e-5, timer=local_timer, getsizeof=getsizeof)