lib/ratelimit, lib/concurrentlimit: add protocol-neutral rate and concurrency limiters - #288
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Vikramarjuna wants to merge 2 commits into
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lib/ratelimit, lib/concurrentlimit: add protocol-neutral rate and concurrency limiters#288Vikramarjuna wants to merge 2 commits into
Vikramarjuna wants to merge 2 commits into
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Adds lib/ratelimit, a three-tier token-bucket rate limiter (global, per-method, per-user-per-method) intended to be shared across SRPC, gRPC and REST handlers so quotas cannot be bypassed by switching protocols. Denials return *errors.ResourceExhaustedError.
Refactors the existing lib/srpc/serverutil.PerUserMethodLimiter, lifting its per-(user, method) semaphore into a protocol-neutral lib/concurrentlimit package so future gRPC and REST adapters can reuse it. Semantics unchanged; the SRPC adapter becomes a thin wrapper preserving NewPerUserMethodLimiter and BlockMethod signatures, so existing callers build unmodified.