Hey HN! I extracted BreakerMachines from my apps after seeing people dealing with cascading failures in production Rails apps.
Key features that set it apart:
- True async/fiber support (works with Falcon, async gems)
- Built-in fallback mechanism with chaining
- Thread-safe without dangerous Timeout.timeout
- Memory-efficient with WeakRef tracking
- Rich introspection and monitoring hooks
- Clean DSL that works with inheritance
With everyone adding AI/LLM APIs to their apps, circuit breakers are more critical than ever.
These APIs can be slow, flaky, or have outages - without protection, your app goes down with them.
The README shows patterns for graceful degradation when a service is down.
I explicitly avoided shipping Redis/DB adapters to keep it focused, the README shows how to implement your own in ~20 lines.
Would love feedback on the API design and any edge cases I might have missed!
I'm still going to add the parallel feature, i removed it because i need to test it in CI.
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