Standardize uuid generation for events/storage/registry (#39184)

homeassistant/util/uuid.py

@@ -0,0 +1,15 @@
+"""Helpers to generate uuids."""
+
+import random
+import uuid
+
+
+def uuid_v1mc_hex() -> str:
+    """Generate a uuid1 with a random multicast MAC address.
+
+    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
+    """
+    return uuid.uuid1(node=random.getrandbits(48) | (1 << 40)).hex