Reference library

Reliability & rate limiting

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

3 matches

Exactly Once Processing Dedupe Mock in Python

Implements a streaming deduplicator using a set and queue to guarantee each item is processed exactly once while preserving insertion order.

deduplication exactly-once streaming

Python

from collections import deque

class DedupeStream:
    def __init__(self):
        self.seen = set()
        self.queue = deque()

    def add(self, item):
        if item not in self.seen:
            self.seen.add(item)
            self.queue.append(item)
            print(f"Processed: {item} (exactly once)")
      …

15 0 Open

Reliability & rate limiting easy

How to Mock Daily and Monthly Quota Counters in Python

Track daily and monthly API call usage with automatic resets, quota checks, and limits using a Python class.

quota rate-limiting class

Python

import random
from datetime import datetime, timedelta


class QuotaCounter:
    def __init__(self, daily_limit=1000, monthly_limit=20000):
        self.daily_limit = daily_limit
        self.monthly_limit = monthly_limit
        self.daily_usage = 0
        self.monthly_usage = 0
        self.current_day = datetime.n…

17 0 Open

Reliability & rate limiting medium

How to Mock a Circuit Breaker Reset Timeout in Python

This code implements a simple circuit breaker with a reset timeout test, simulating a flaky service to show half-open state transitions.

circuit-breaker reliability mock-testing

Python

import time
import random


class CircuitBreaker:
    def __init__(self, failure_threshold=3, reset_timeout=5):
        self.failure_threshold = failure_threshold
        self.reset_timeout = reset_timeout
        self.failure_count = 0
        self.last_failure_time = None
        self.state = "CLOSED"  # CLOSED (nor…

15 0 Open

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