Add caller rate-limit interceptor interface with no-op default#11012
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What changed?
Adds an OSS
CallerRateLimitInterceptorextension point for per-caller rate limiting: the interface + a no-op default (NewNoopCallerRateLimitInterceptor),ErrCallerRateLimitExceeded(causeRESOURCE_EXHAUSTED_CAUSE_CALLER_RPS_LIMIT, scopeNAMESPACE), an fx provider of the no-op, and a call site in the Nexus request path. Cloud injects the enforcing implementation viafx.Decorate.The caller check is the first resource gate — it runs before namespace-concurrency, namespace-RPS, and the global RPS limiter — so one abusive caller can't consume the shared namespace/global budget before being throttled.
Why?
OSS ships the schema/plumbing; enforcement is Cloud-only. The no-op default means zero behavior change for OSS.
How did you test it?
Potential risks
No-op default → no behavior change in OSS. [NOT READY]: references
enumspb.RESOURCE_EXHAUSTED_CAUSE_CALLER_RPS_LIMIT, which requires thego.temporal.io/apirelease (temporalio/api#827) + ago.modbump before this compiles in CI. Part of the caller rate-limit feature.