asyncbreaker

asyncbreaker is an asyncio-first Python implementation of the Circuit Breaker pattern from Michael T. Nygard's book Release It!.

Circuit breakers let one subsystem fail without taking down the whole application: you wrap risky calls (often I/O or integration boundaries) so that repeated failures trip the breaker, subsequent calls fail fast for a reset timeout, then a single trial call may close the circuit again.

Lineage

  • pybreaker (Daniel Fernandes Martins) — original design.
  • aiobreaker fork (Alexander Lyon) — asyncio instead of Tornado, packaging experiments.
  • Current line — maintained by Sergey Turbinov; substantial rewrite toward a pure async API, async storage, and async listeners. Contact: @freems on Telegram.

Features

  • Async CircuitBreaker — use await breaker.call(...)
  • Configurable failure threshold (fail_max) and reset window (timeout_duration)
  • Excluded exceptions and predicate callables (business vs system errors)
  • Multiple async Listener instances
  • Pluggable async storage: in-process memory or Redis via redis.asyncio
  • Optional redis extra for Redis-backed storage

Requirements

Python 3.10+ (async patterns and typing used throughout).

Installation

pip install asyncbreaker

With Redis support (redis package):

pip install asyncbreaker[redis]

Usage

Create a breaker per integration point. Only async callables are supported; the decorator rejects ordinary def functions.

from datetime import timedelta

from asyncbreaker import CircuitBreaker

api_breaker = CircuitBreaker(fail_max=5, timeout_duration=timedelta(seconds=60))

@api_breaker
async def fetch_remote():
    ...

# or explicitly:
await api_breaker.call(fetch_remote)

See changelog.md for the full API story (listeners, storage, open / close / half_open, exclusion rules). A MkDocs site will be added later.

Development

This project uses uv:

uv sync
uv run pytest test

License

BSD 3-Clause; see license.md. This project bundles copyright from the pybreaker lineage; additional copyright applies to the asyncio rewrite (see license.md).

Project links

Data verified by PyPI on Aug 14, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

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Latest release

1 maintainer

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Avatar for freems from gravatar.com freems

Credits

Author: Sergey Turbinov

GitHub Statistics

Data verified by PyPI on Aug 14, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

BSD-3-Clause
View SPDX License List

Requires

Python >=3.10

Provides Extra

docs redis test

Tags

asyncio circuit-breaker redis resilience

Classifiers

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