moonbitstack/moonzero/shedder

README
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moonbitstack/moonzero/shedder does not have a README file

Shedder

pub struct Shedder {
  threshold : Int64
  usage : () -> Int64
}

Load shedding under CPU pressure (← go-zero's load.AdaptiveShedder, wired from RestConf.CpuThreshold): admit while measured CPU sits at or below the threshold, shed above it. Both numbers are per-mille, so go-zero's default 900 means 90%.

go-zero reads stat.CpuUsage() and additionally sheds on in-flight count against a moving pass/latency estimate. No MoonBit backend can read a CPU meter, so the usage source is injected the way Clock is, and a shedder built without one reports 0 and never sheds — the in-flight half is not modelled.

Shedder::allow

source

fn Shedder::allow(self : Shedder) -> Bool

Whether a request is admitted at the current usage.

Shedder::new

source

fn Shedder::new(threshold : Int64, usage? : () -> Int64) -> Shedder

A shedder that sheds once usage exceeds threshold per-mille.

Shedder::usage

source

fn Shedder::usage(self : Shedder) -> Int64

The CPU usage the shedder is reading, per mille.

Source Files

shedder.mbt

Install

Download zip

moonzero — a service framework for MoonBit (← go-zero): config-driven assembly of a moonapi application with middleware, producing a runnable moonasgi AsgiApp. v0.6.2 runs real unary, server/client-streaming, and bidirectional zRPC calls over moonrpc's h2c transport (an in-process RpcChannel drives HPACK HEADERS + length-prefixed DATA + grpc-status trailers through the H2Server engine), graceful shutdown draining in-flight calls, a persisted, watchable etcd v3-shaped registry (watch, events_since catch-up, snapshot/restore) with round-robin/pick-first balancers and a load-balanced client, real file-backed registry I/O over moonbitlang/async's fs with a live filesystem watcher (native discov driver), request metrics (counter + latency histogram), and W3C traceparent propagation.

go-zeromicroserviceservermiddlewaremoonapimoonbit