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Caching & Redis

Cache-aside, TTL, invalidation, hot keys, and in-memory lookup patterns at scale.

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How to Mock Redis Pub/Sub in Python

Test Redis pub/sub logic without a live server using an in-memory fake that queues published messages per channel.

redis pubsub testing
Python 
import redis
import time
import threading


class MockRedisPubSub:
    def __init__(self):
        self.channels = {}

    def publish(self, channel, message):
        if channel not in self.channels:
            return 0
        for subscriber in self.channels[channel]:
            subscriber.put(message)
        ret…
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