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Reliability & rate limiting

Retries, exponential backoff, circuit breakers, token buckets, and idempotent handlers.

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Reliability & rate limiting easy

How to Implement a Dead Letter Queue Replay in Python

A mock Dead Letter Queue that stores failed messages with retry attempts and replays them with a simple retry counter.

dead-letter-queue queue retry
Python 
import json
from collections import deque

class DeadLetterQueue:
    def __init__(self):
        self.messages = deque()
    
    def add_message(self, message_id, payload, attempts=3):
        """Add a message to the DLQ with retry metadata."""
        self.messages.append({
            "id": message_id,
           …
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