有没有办法设置Django缓存锁的过期时间

Question

我有一个Django 3.1.3服务器，它通过Django Redis 4.12.1使用Redis作为缓存。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，当with块完成执行时，缓存锁释放。然而，我的代码中有一些自定义逻辑，有时不会释放缓存锁(由于我自己的原因，这很好(。

我的问题是：有没有一种方法可以为Django缓存锁设置超时值，就像设置缓存值(cache.set('some_key', 'Hello world', 3000)(的超时一样？

Answer 1

我已经回答了自己的问题。以下参数可用于cache.lock()：

def lock(
self,
key,
version=None,
timeout=None,
sleep=0.1,
blocking_timeout=None,
client=None,
thread_local=True,
):

将其与Python Redis源代码的注释交叉引用，后者使用相同的参数：

``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长2秒时间，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)