为 Firestore 分布式计数器创建自定义分片和计数器类型（异步）

为 Firestore 分布式计数器（异步）创建自定义分片和计数器类型。

深入探索

如需查看包含此代码示例的详细文档，请参阅以下内容：

• 分布式计数器
• 分布式计数器

代码示例

Python

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import random

from google.cloud import firestore

class Shard(object):
    """
    A shard is a distributed counter. Each shard can support being incremented
    once per second. Multiple shards are needed within a Counter to allow
    more frequent incrementing.
    """

    def __init__(self):
        self._count = 0

    def to_dict(self):
        return {"count": self._count}

class Counter(object):
    """
    A counter stores a collection of shards which are
    summed to return a total count. This allows for more
    frequent incrementing than a single document.
    """

    def __init__(self, num_shards):
        self._num_shards = num_shards

后续步骤

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