python 版本分布式锁
#!/usr/bin/env python2.7# -*- coding:utf-8 -*-
#
# Author: yunjianfei
# E-mail: yunjianfei1987@gmail.com
# Date : 2014/12/09
# Desc :
#
import logging, os, time
from kazoo.client import KazooClient
from kazoo.client import KazooState
from kazoo.recipe.lock import Lock
class ZooKeeperLock():
def __init__(self, hosts, id_str, lock_name, logger=None, timeout=1):
self.hosts = hosts
self.id_str = id_str
self.zk_client = None
self.timeout = timeout
self.logger = logger
self.name = lock_name
self.lock_handle = None
self.create_lock()
def create_lock(self):
try:
self.zk_client = KazooClient(hosts=self.hosts, logger=self.logger, timeout=self.timeout)
self.zk_client.start(timeout=self.timeout)
except Exception, ex:
self.init_ret = False
self.err_str = "Create KazooClient failed! Exception: %s" % str(ex)
logging.error(self.err_str)
return
try:
lock_path = os.path.join("/", "locks", self.name)
self.lock_handle = Lock(self.zk_client, lock_path)
except Exception, ex:
self.init_ret = False
self.err_str = "Create lock failed! Exception: %s" % str(ex)
logging.error(self.err_str)
return
def destroy_lock(self):
#self.release()
if self.zk_client != None:
self.zk_client.stop()
self.zk_client = None
def acquire(self, blocking=True, timeout=None):
if self.lock_handle == None:
return None
try:
return self.lock_handle.acquire(blocking=blocking, timeout=timeout)
except Exception, ex:
self.err_str = "Acquire lock failed! Exception: %s" % str(ex)
logging.error(self.err_str)
return None
def release(self):
if self.lock_handle == None:
return None
return self.lock_handle.release()
def __del__(self):
self.destroy_lock()
def main():
logger = logging.getLogger()
logger.setLevel(logging.INFO)
sh = logging.StreamHandler()
formatter = logging.Formatter('%(asctime)s -%(module)s:%(filename)s-L%(lineno)d-%(levelname)s: %(message)s')
sh.setFormatter(formatter)
logger.addHandler(sh)
zookeeper_hosts = "192.168.10.2:2181, 192.168.10.3:2181, 192.168.10.4:2181"
lock_name = "test"
lock = ZooKeeperLock(zookeeper_hosts, "myid is 1", lock_name, logger=logger)
ret = lock.acquire()
if not ret:
logging.info("Can't get lock! Ret: %s", ret)
return
logging.info("Get lock! Do something! Sleep 10 secs!")
for i in range(1, 11):
time.sleep(1)
print str(i)
lock.release()
if __name__ == "__main__":
try:
main()
except Exception, ex:
print "Ocurred Exception: %s" % str(ex)
quit()
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