resilienceComposable fault tolerance library for Go

Open source resilience middleware for Go. Retry, backoff — battle-tested. Circuit breaker, rate limiter — on the roadmap. One primitive: func(ctx, call) error.

Quick Start

Devlog

GitHub

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One Primitive

Every resilience pattern is an Option: func(ctx, call) error. Retry, backoff — ready. Timeout, circuit breaker, rate limiter — same shape, planned.

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Zero Dependencies (target)

Target architecture: zero-dependency core, OTEL and future plugins in separate Go modules. Blocked on multimod (extracted to standalone repo) — today everything lives in one module. Tracking in devlog #3.

Why it's blocked →

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Two Extension Points

Option controls execution (per-call). Plugin observes execution (shared state). Two words, two contracts, no confusion.

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OTEL Metrics Built-in

rsotel.Plugin() — one line. Calls, errors, retries, backoff waits — all metered. No OTEL SDK? Zero overhead (no-op instruments).

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Per-Call State

Each Do() gets fresh Options. No shared mutable state. No data races by construction, not by mutex.

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Active Development

Born from killing a 1500-line framework inside autosolve. Retry and backoff are battle-tested. Circuit breaker, rate limiter, bulkhead — planned. This is a growing toolkit, not a finished product.

See the roadmap →