multistore-metering

Usage metering and quota enforcement middleware for the multistore S3 proxy gateway.

Overview

Provides a Middleware implementation that hooks into the proxy dispatch pipeline to enforce quotas before requests proceed and record usage after responses complete. Integrators supply their own storage backends by implementing two traits:

• QuotaChecker — called pre-dispatch; return Err(QuotaExceeded) to reject with HTTP 429
• UsageRecorder — called post-dispatch with a UsageEvent (identity, operation, bytes, status)

Usage

use multistore_metering::{MeteringMiddleware, NoopQuotaChecker, NoopRecorder};

// With both:
let metering = MeteringMiddleware::new(my_quota_checker, my_recorder);

// Or selectively:
let quota_only = MeteringMiddleware::new(my_quota_checker, NoopRecorder);
let record_only = MeteringMiddleware::new(NoopQuotaChecker, my_recorder);

let gateway = gateway.with_middleware(metering);