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Reliability & rate limiting

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

3 matches

How to Mock a Timeout per HTTP Request in Python

Simulate a per-request HTTP timeout using unittest.mock to test timeout handling without network access.

import time
from unittest.mock import Mock, patch

# Simulate an HTTP client that might time out
def fetch_data(url, timeout=5):
    time.sleep(0.5)  # Simulate network delay
    return f"Response from {url}"

# Mock to test timeout behavior without real network
def test_timeout():
    mock_response = Mock(side_effect…

12 0 Open

Reliability & rate limiting easy

How to mock a fallback return value in Python

Test a function that returns a default value on failure by mocking requests.get and its side effects.

unittest mocking requests

Python

from unittest.mock import Mock, patch
import requests

def fetch_data(url, default=None):
    try:
        response = requests.get(url)
        response.raise_for_status()
        return response.json()
    except (requests.RequestException, ValueError):
        return default

with patch("requests.get") as mock_get:
…

15 0 Open

Reliability & rate limiting medium

How to retry idempotent operations with a mock in Python

Wrap a flaky idempotent operation in a retry loop with exponential backoff, and use unittest.mock to deterministically test the str's behavior.

retry backoff mock

Python

import random
import time
from unittest.mock import Mock


def idempotent_operation(value):
    """Simulate an idempotent operation that sometimes fails."""
    if random.random() < 0.6:  # 60% failure rate
        raise ConnectionError("Temporary failure")
    return value * 2


def retry_with_backoff(operation, max_…

14 0 Open

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