Awesome
proxy-wasm-rust-rate-limiting
A prototype implementation of a rate-limiting filter written in Rust, using the proxy-wasm API for running on WebAssembly-enabled gateways.
What's implemented
- "local" policy only, using the SHM-based key-value store
What's missing
- 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.
Build requirements
- Rust
- rustup.rs is the easiest way to install Rust.
- Then add the Wasm32-WASI target to your toolchain:
rustup target add wasm32-wasi.
- Then add the Wasm32-WASI target to your toolchain:
- rustup.rs is the easiest way to install Rust.
Building and running
Once the environment is set up with cargo in your PATH,
you can build it with:
cargo build --release
This will produce a .wasm file in target/wasm32-wasi/release/.
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_KV_KONG_WASM_RATE_LIMITING_COUNTERS=12m