redis多实例分布式锁：Python实现redlock分布式锁算法代码示例

Redlock是一种分布式锁算法，它可以在多个Redis实例之间协调锁。Redlock算法的基本思想是，使用多个Redis实例来协调锁，以确保在任何情况下都不会出现死锁或竞争条件。Redlock算法的实现比较复杂，需要考虑多个因素，例如时钟漂移、网络延迟等。如果您想了解更多关于Redlock算法的信息，可以参考以下链接：

以下是一个使用Redlock算法实现分布式锁的Python代码示例：

import redis
import time

class Redlock(object):
    def __init__(self, connection_list, retry_times=3, retry_delay=200):
        self.servers = []
        for connection in connection_list:
            self.servers.append(redis.StrictRedis(host=connection["host"], port=connection["port"], db=connection["db"]))
        self.quorum = len(self.servers) // 2 + 1
        self.retry_times = retry_times
        self.retry_delay = retry_delay

    def lock(self, resource, ttl):
        retry = self.retry_times
        while retry > 0:
            n = 0
            start_time = time.time() * 1000
            for server in self.servers:
                if server.set(resource, 1, nx=True, px=ttl):
                    n += 1
            elapsed_time = time.time() * 1000 - start_time
            validity = ttl - elapsed_time - 2
            if n >= self.quorum and validity > 0:
                return validity
            else:
                for server in self.servers:
                    server.delete(resource)
                retry -= 1
                time.sleep(self.retry_delay / 1000)
        return False

    def unlock(self, resource):
        for server in self.servers:
            server.delete(resource)

# Example usage:
redlock = Redlock([{
    
    "host": "localhost", "port": 6379, "db": 0}], retry_times=3, retry_delay=200)
validity = redlock.lock("my_resource", 10000)
if validity:
    print("Lock acquired")
    # Do something here...
    redlock.unlock("my_resource")
else:
    print("Failed to acquire lock")