EdgeStash

A Redis-compatible rate limiter, running in WebAssembly at the edge.

Every allow/deny below is decided by Valdr, a safe-Rust port of Valkey compiled to wasm, running a Lua token bucket inside a Cloudflare Durable Object. No external Redis.

request → Worker → Durable Object → valdr-engine (wasm) → Lua

Try it

Prompt to the toy edge LLM Tokens

– / – tokens ready

refills to full in –

Spend faster than the bucket refills and the next request gets a 429, decided locally by the Lua below.

Policy

Stored as a Valdr hash and read by the script. Change it and the same script honors the new limits, with no redeploy.

Capacity Refill tokens Window (ms)

Keyspace

What the Durable Object actually persists for this tenant — each Redis key under its own value, dumped live from /v1/_debug/<tenant>. The wrangler Local Explorer can't read a Rust Durable Object over RPC, so this is the in-product view.

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The Lua

The exact script the engine runs for every decision, fetched live from /script.

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