利用Python+Redis实现分布式锁
利用Python+Redis实现分布式锁
欢迎一起交流技术：一个人可以走的很快，但是一群人却可以走的更远。
常见关系型数据库(Oracle+MySQL+PG+GP）+高可用企业解决方案+分布式锁
使用场景：
彻底解决HA的脑裂问题
多个服务器之间只允许一个进程执行的场景
class MyDLock(object):
def __init__(self, lockID,timeout):
self.connection = redis.Redis(host=cfg.REDIS_SERVER_IP
, port=cfg.REDIS_SERVER_PORT
, password=cfg.REDIS_SERVER_PWD
, db=cfg.REDIS_SERVER_DB_NUM
,decode_responses=True)
self.__lockID = lockID
self.__timeout = timeout
def tryLock(self, appid):
#To_Main
try:
val=self.connection.get(self.__lockID)
if val is None:
logging.info("The app(%s) try lock(%s) ok." % (appid, self.__lockID));
self.connection.set(self.__lockID, appid, ex=self.__timeout)
return True
else:
logging.info("The owner of lock(%s) is %s. you(%s) can not get it"%(self.__lockID, val, appid));
return False
except Exception as e:
logging.error("Warning: Can't write log. (%s)" % e)
return False
def activeLock(self, appid):
#心跳，定期激活
val = self.connection.get(self.__lockID)
if val is None:
logging.info("There is no lock(%s)." % (self.__lockID));
return False
else:
if appid == val:
#只能激活自己的锁
logging.info("Application(%s) active lock(%s) ok." % (appid, self.__lockID));
self.connection.set(self.__lockID, appid, ex=self.__timeout)
return True
else:
#不能激活非自己的锁
logging.info("Application(%s) can not active lock(%s). The owner is (%s)" % (appid, self.__lockID, val));
return False
def releaseLock(self, key, appid):
val = self.connection.get(self.__lockID)
if val is None:
return False
else:
if appid == val:
# 只能删除自己的锁
self.connection.delete(self.__lockID)
return True
else:
# 不能删除非自己的锁
return False
