Lock added blocking parameter

changelog.d/752.bugfix

@@ -0,0 +1 @@
+Added blocking parameter for `cache.lock`

django_redis/client/default.py

@@ -326,9 +326,7 @@ def expire(
 
         key = self.make_key(key, version=version)
 
-        # for some strange reason mypy complains,
-        # saying that timeout type is float | timedelta
-        return client.expire(key, timeout)  # type: ignore
+        return client.expire(key, timeout)
 
     def pexpire(
         self,
@@ -345,11 +343,7 @@ def pexpire(
 
         key = self.make_key(key, version=version)
 
-        # Temporary casting until https://github.com/redis/redis-py/issues/1664
-        # is fixed.
-        # for some strange reason mypy complains,
-        # saying that timeout type is float | timedelta
-        return bool(client.pexpire(key, timeout))  # type: ignore
+        return bool(client.pexpire(key, timeout))
 
     def pexpire_at(
         self,
@@ -393,6 +387,7 @@ def lock(
         version: Optional[int] = None,
         timeout: Optional[float] = None,
         sleep: float = 0.1,
+        blocking: bool = True,
         blocking_timeout: Optional[float] = None,
         client: Optional[Redis] = None,
         thread_local: bool = True,
@@ -405,6 +400,7 @@ def lock(
             key,
             timeout=timeout,
             sleep=sleep,
+            blocking=blocking,
             blocking_timeout=blocking_timeout,
             thread_local=thread_local,
         )

django_redis/client/herd.py

@@ -26,9 +26,7 @@ def _is_expired(x, herd_timeout: int) -> bool:
         return True
     val = x + random.randint(1, herd_timeout)
 
-    if val >= herd_timeout:
-        return True
-    return False
+    return val >= herd_timeout
 
 
 class HerdClient(DefaultClient):

tests/test_backend.py

@@ -677,15 +677,27 @@
 
     def test_lock(self, cache: RedisCache):
         lock = cache.lock("foobar")
-        lock.acquire(blocking=True)
+        assert lock.acquire(blocking=True)
+
+        assert cache.has_key("foobar")
+        lock.release()
+        assert not cache.has_key("foobar")
+
+    def test_lock_not_blocking(self, cache: RedisCache):
+        lock = cache.lock("foobar")
+        assert lock.acquire(blocking=False)
+
+        lock2 = cache.lock("foobar")
+
+        assert not lock2.acquire(blocking=False)
 
         assert cache.has_key("foobar")
         lock.release()
         assert not cache.has_key("foobar")
 
     def test_lock_released_by_thread(self, cache: RedisCache):
         lock = cache.lock("foobar", thread_local=False)
-        lock.acquire(blocking=True)
+        assert lock.acquire(blocking=True)
 
         def release_lock(lock_):
             lock_.release()