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distributed locking bank business

Eric Nguyen answered on October 10, 2023 Popularity 5/10 Helpfulness 1/10

answer distributed locking bank business

distributed locking bank business

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import time
import uuid
import redis

class DistributedLock:
    def __init__(self, hosts, lock_key, expire_time=30):
        self.lock_key = lock_key
        self.expire_time = expire_time
        self.clients = [redis.StrictRedis(host=host, port=6379, db=0) for host in hosts]
        self.lock_identifier = str(uuid.uuid4())

    def acquire(self):
        acquired_locks = 0
        for client in self.clients:
            if client.set(self.lock_key, self.lock_identifier, nx=True, ex=self.expire_time):
                acquired_locks += 1

        # Check if the lock was acquired on the majority of instances
        if acquired_locks > len(self.clients) / 2:
            return True

        # If not, release the lock on all instances and return False
        self.release()
        return False

    def release(self):
        for client in self.clients:
            # Use a Lua script to ensure the lock is only released if the identifier matches
            release_script = """
            if redis.call('get', KEYS[1]) == ARGV[1] then
                return redis.call('del', KEYS[1])
            else
                return 0
            end
            """
            client.eval(release_script, 1, self.lock_key, self.lock_identifier)

Popularity 5/10 Helpfulness 1/10 Language whatever

Source: codedamn.com

Tags: bank whatever

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Contributed on Oct 10 2023

Eric Nguyen

0 Answers Avg Quality 2/10

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