Circuit Breaker

Stop calling failing services. Prevent cascade failures.

const breaker = new CircuitBreaker(() => flakeyAPI(), { threshold: 5, resetTimeoutMs: 30000 });
try { await breaker.execute(); }
catch (e) { /* service is down, fail fast */ }

States

• CLOSED: calls pass through normally; failures are counted.
• OPEN: calls fail fast once threshold consecutive failures are hit.
• HALF_OPEN: after resetTimeoutMs elapses, the next call is allowed through as a trial; success closes the circuit, failure re-opens it.

Solves: Cascade failures, resource exhaustion, graceful degradation. License: MIT

Sponsored by Ferrow

Part of the ferrow-toolkit collection · Sponsored by Ferrow