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, REDIS_PORT, REDIS_PASSWD
22 def __init__(self, lock_key, host=REDIS_HOST, port=REDIS_PORT, password=REDIS_PASSWD, db=9, lock_timeout=5 * 60):
23 self.lock_key = lock_key
24 self.lock_timeout = lock_timeout
25 self.redis = redis.Redis(host=host, port=port, db=db, password=password)
26 self.acquire_time = -1
29 begin = now = int(time.time())
30 while (now - begin) < self.lock_timeout:
32 result = self.redis.setnx(self.lock_key, now + self.lock_timeout + 1)
33 if result == 1 or result is True:
34 self.acquire_time = now
37 current_lock_timestamp = self.redis.get(self.lock_key)
38 if not current_lock_timestamp:
42 current_lock_timestamp = int(current_lock_timestamp)
44 if now > current_lock_timestamp:
45 next_lock_timestamp = self.redis.getset(self.lock_key, now + self.lock_timeout + 1)
46 if not next_lock_timestamp:
49 next_lock_timestamp = int(next_lock_timestamp)
51 if next_lock_timestamp == current_lock_timestamp:
52 self.acquire_time = now
60 now = int(time.time())
61 if now > self.acquire_time + self.lock_timeout:
62 # key expired, do nothing and let other clients handle it
64 self.acquire_time = None
65 self.redis.delete(self.lock_key)
68 def do_biz_with_share_lock(lock_name, callback):
69 lock = SharedLock(lock_name)
71 if not lock.acquire():
72 raise Exception(lock_name + " timeout")
74 except Exception as e: