Python代码示例：Twitter的Snowflake雪花算法实现过程

我就是我 2024-02-17 10:08 67阅读 0赞

以下是一个简化的示例代码，演示了如何实现Twitter的Snowflake算法：

import time
    
    class Snowflake:
        def __init__(self, worker_id, datacenter_id, sequence=0):
            self.worker_id = worker_id
            self.datacenter_id = datacenter_id
            self.sequence = sequence
            self.last_timestamp = -1
    
        def generate_id(self):
            timestamp = self._get_timestamp()
    
            if timestamp < self.last_timestamp:
                raise Exception("Invalid system clock!")
    
            if timestamp == self.last_timestamp:
                self.sequence = (self.sequence + 1) & 4095
                if self.sequence == 0:
                    timestamp = self._wait_next_millis(self.last_timestamp)
            else:
                self.sequence = 0
    
            self.last_timestamp = timestamp
    
            return (
                (timestamp << 22)
                | (self.datacenter_id << 17)
                | (self.worker_id << 12)
                | self.sequence
            )
    
        def _get_timestamp(self):
            return int(time.time() * 1000)
    
        def _wait_next_millis(self, last_timestamp):
            timestamp = self._get_timestamp()
            while timestamp <= last_timestamp:
                timestamp = self._get_timestamp()
            return timestamp

使用示例：

# 创建Snowflake实例，传入worker_id和datacenter_id
    snowflake = Snowflake(worker_id=1, datacenter_id=1)
    
    # 生成唯一ID
    unique_id = snowflake.generate_id()
    
    print(unique_id)

在实际使用中，需要根据具体的业务需求进行适当的调整和扩展，例如添加数据中心ID和工作节点ID的位数，调整时钟回拨的处理逻辑等。此示例代码仅为演示Snowflake算法的基本原理，并不包含完整的错误处理和容错机制。