Database Models (lockmgr.models)¶

Functions

default_lock_expiry()

Classes

Lock(name, locked_by, lock_process, …)

class lockmgr.models.Lock(name, locked_by, lock_process, locked_until, created_at, updated_at)[source]¶

exception DoesNotExist¶

exception MultipleObjectsReturned¶

property expired¶: Property - returns True if the Lock is past expiry ( locked_until ), otherwise False

property expires_in¶: The amount of time until this lock expires, as a timedelta - or None if it doesn’t expire

property expires_seconds¶: The amount of seconds until this lock expires as integer seconds - or None if it doesn’t expire

locked_by¶: Name of the node / app which created this lock

locked_until¶

Locks have an expiration time, to help avoid the issue of stuck locks, either due to forgetting to add cleanup code, or simply due to the app/server crashing before it can release the lock.

After a lock has expired, it’s assumed that the lock is stale and needs to be removed, and the affected resources are safe to use.

name¶: Unique name of the lock, referring to what specific resource(s) is locked