2 # -*- coding: utf-8 -*-
3 # Copyright (c) 2017 Wind River Systems, Inc.
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at:
8 # http://www.apache.org/licenses/LICENSE-2.0
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS,
12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 from multivimbroker.pub.config.config import REDIS_HOST
19 from multivimbroker.pub.config.config import REDIS_PORT
20 from multivimbroker.pub.config.config import REDIS_PASSWD
24 def __init__(self, lock_key, host=REDIS_HOST, port=REDIS_PORT,
25 password=REDIS_PASSWD, db=9, lock_timeout=5 * 60):
26 self.lock_key = lock_key
27 self.lock_timeout = lock_timeout
28 self.redis = redis.Redis(host=host, port=port,
29 db=db, password=password)
30 self.acquire_time = -1
33 begin = now = int(time.time())
34 while (now - begin) < self.lock_timeout:
36 result = self.redis.setnx(self.lock_key, now +
37 self.lock_timeout + 1)
38 if result == 1 or result is True:
39 self.acquire_time = now
42 current_lock_timestamp = self.redis.get(self.lock_key)
43 if not current_lock_timestamp:
47 current_lock_timestamp = int(current_lock_timestamp)
49 if now > current_lock_timestamp:
50 next_lock_timestamp = self.redis.getset(self.lock_key, now +
51 self.lock_timeout + 1)
52 if not next_lock_timestamp:
55 next_lock_timestamp = int(next_lock_timestamp)
57 if next_lock_timestamp == current_lock_timestamp:
58 self.acquire_time = now
66 now = int(time.time())
67 if now > self.acquire_time + self.lock_timeout:
68 # key expired, do nothing and let other clients handle it
70 self.acquire_time = None
71 self.redis.delete(self.lock_key)
74 def do_biz_with_share_lock(lock_name, callback):
75 lock = SharedLock(lock_name)
77 if not lock.acquire():
78 raise Exception(lock_name + " timeout")
80 except Exception as e: