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rust.circuit_breaker

Stability High

Detects external service calls without circuit breaker protection.

Why It Matters

Missing circuit breakers:

Cascade failures — One service down takes all down
Resource exhaustion — Threads blocked on failing calls
No recovery — System stays broken after transient issues

Example

// ❌ Before (no circuit breaker)
async fn call_payment_service(payment: &Payment) -> Result<Receipt> {
    client.post("/charge").json(payment).send().await?
}

// ✅ After (with circuit breaker)
use failsafe::{Config, CircuitBreaker, Error};

lazy_static! {
    static ref BREAKER: CircuitBreaker<(), Error> = Config::default()
        .failure_policy(consecutive_failures(5))
        .build();
}

async fn call_payment_service(payment: &Payment) -> Result<Receipt> {
    BREAKER.call(|| async {
        client.post("/charge").json(payment).send().await
    }).await?
}

What Unfault Detects

HTTP clients without circuit breakers
gRPC calls without protection
Database connections without failover

Auto-Fix

Unfault can add circuit breaker wrappers using failsafe or similar crates.