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Improve performance of generating non-cryptographically secure uuids (#41314)

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J. Nick Koston 2020-10-07 09:37:01 -05:00 • committed by GitHub
parent 451f27bba1
commit 8d5c124deb
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6 changed files with 14 additions and 17 deletions
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15
homeassistant/util/uuid.py
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@ -1,15 +1,12 @@
"""Helpers to generate uuids."""
import random
import uuid
from random import getrandbits
def uuid_v1mc_hex() -> str:
"""Generate a uuid1 with a random multicast MAC address.
def random_uuid_hex() -> str:
"""Generate a random UUID hex.
The uuid1 uses a random multicast MAC address instead of the real MAC address
of the machine without the overhead of calling the getrandom() system call.
This is effectively equivalent to PostgreSQL's uuid_generate_v1mc() function
This uuid should not be used for cryptographically secure
operations.
"""
return uuid.uuid1(node=random.getrandbits(48) | (1 << 40)).hex
return "%032x" % getrandbits(32 * 4)