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Use postgresql style uuid generation (uuid_generate_v1mc) for Context uuids (#38089)

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This avoids the syscall to getrandom() every time we generate a uuid.
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J. Nick Koston 2020-07-22 18:53:01 -10:00 committed by GitHub
parent d7811a4adf
commit 6e2025a748
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1 changed files with 8 additions and 1 deletions
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9
homeassistant/core.py
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@ -12,6 +12,7 @@ from ipaddress import ip_address
import logging import logging
import os import os
import pathlib import pathlib
import random
import re import re
import threading import threading
from time import monotonic from time import monotonic
@ -458,7 +459,13 @@ class Context:
user_id: str = attr.ib(default=None) user_id: str = attr.ib(default=None)
parent_id: Optional[str] = attr.ib(default=None) parent_id: Optional[str] = attr.ib(default=None)
id: str = attr.ib(factory=lambda: uuid.uuid4().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
id: str = attr.ib(
factory=lambda: uuid.uuid1(node=random.getrandbits(48) | (1 << 40)).hex
)
def as_dict(self) -> dict: def as_dict(self) -> dict:
"""Return a dictionary representation of the context.""" """Return a dictionary representation of the context."""