如何解决有没有办法为 Django 缓存锁设置过期时间?
我有一个 Django 3.1.3 服务器,它通过 django-redis 4.12.1 使用 Redis 作为其缓存。我知道缓存锁通常可以通过以下方式设置:
with cache.lock('my_cache_lock_key'):
# Execute some logic here,such as:
cache.set('some_key','Hello world',3000)
通常,缓存锁在 with
块执行完成时释放。但是,我的代码中有一些自定义逻辑,有时不会释放缓存锁(出于我自己的原因,这很好)。
我的问题:有没有办法为 Django 缓存锁设置超时值,就像您可以为设置缓存值 (cache.set('some_key',3000)
) 设置超时一样?
解决方法
我已经回答了我自己的问题。 following arguments 可用于 cache.lock()
:
def lock(
self,key,version=None,timeout=None,sleep=0.1,blocking_timeout=None,client=None,thread_local=True,):
交叉引用来自 Python Redis source 的注释,使用相同的参数:
``timeout`` indicates a maximum life for the lock.
By default,it will remain locked until release() is called.
``timeout`` can be specified as a float or integer,both representing
the number of seconds to wait.
``sleep`` indicates the amount of time to sleep per loop iteration
when the lock is in blocking mode and another client is currently
holding the lock.
``blocking`` indicates whether calling ``acquire`` should block until
the lock has been acquired or to fail immediately,causing ``acquire``
to return False and the lock not being acquired. Defaults to True.
Note this value can be overridden by passing a ``blocking``
argument to ``acquire``.
``blocking_timeout`` indicates the maximum amount of time in seconds to
spend trying to acquire the lock. A value of ``None`` indicates
continue trying forever. ``blocking_timeout`` can be specified as a
float or integer,both representing the number of seconds to wait.
因此,要设置缓存锁定生效的最大时间段为 2 秒,请执行以下操作:
with cache.lock(key='my_cache_lock_key',timeout=2):
# Execute some logic here,such as:
cache.set('some_key','Hello world',3000)
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