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__init__.py
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__init__.py
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import time
__version__ = '0.2.0'
class RedisLock:
def __init__(self, redis, lock_key='redis-lock', lock_timeout=5*60):
self.lock_key = lock_key
self.lock_timeout = lock_timeout
self.redis = redis
def acquire(self):
now = int(time.time())
result = self.redis.setnx(self.lock_key, now + self.lock_timeout + 1)
if result == 1 or result is True:
self.acquire_time = now
return True
current_lock_timestamp = self.redis.get(self.lock_key)
if not current_lock_timestamp:
return False
current_lock_timestamp = int(current_lock_timestamp)
if now > current_lock_timestamp:
next_lock_timestamp = self.redis.getset(self.lock_key, now + self.lock_timeout + 1)
if not next_lock_timestamp:
return False
next_lock_timestamp = int(next_lock_timestamp)
if next_lock_timestamp == current_lock_timestamp:
self.acquire_time = now
return True
return False
def release(self):
now = int(time.time())
if now > self.acquire_time + self.lock_timeout:
# key expired, do nothing and let other clients handle it
return
self.acquire_time = None
self.redis.delete(self.lock_key)