A prototype implementation of a rate-limiting filter written in Go, using the proxy-wasm API for running on WebAssembly-enabled gateways.

• "local" policy only, using the SHM-based key-value store

• Getting proper route and service ids for producing identifiers.
• Other policies, which would require additional features from the underlying system, such as calling out to a Redis instance.

• tinygo
• proxy-wasm-go-sdk
• ffjson

Once the environment is set up with tinygo and ffjson in your PATH, build the filter running make.

Once you have a Wasm-enabled Kong container with a recent ngx_wasm_module integrated (the container from the Summit 2022 Tech Preview is too old), you can run the script in test/demo.sh to give the filter a spin.

You also need the kong_wasm_rate_limiting_counters shared memory key-value store enabled in your Kong configuration. One way to achieve this is via the following environment variable:

export KONG_NGINX_WASM_SHM_KONG_WASM_RATE_LIMITING_COUNTERS=12m