README.md

Hello example

This is a simple serverless application that exposes a single HTTP function that responds with a greeting message.

Install cargo wasi

cargo wasi is a fantastic tool for easily building Rust crates as WebAssembly modules.

Use cargo to install:

$ cargo install cargo-wasi

Running the example

Start with building the example application with cargo wasi:

$ cargo wasi build --release

This will create a hello_example.wasm file in target/wasm32-wasi/release.

Next, start the Wasmtime Functions host:

$ cargo run --manifest-path ../../Cargo.toml --release -- target/wasm32-wasi/release/hello_example.wasm --addr 127.0.0.1:3000
[2021-07-15T00:25:40Z INFO ] Adding route for function 'hello' at '/hello/:name' (GET).
[2021-07-15T00:25:40Z INFO ] Application listening at http://127.0.0.1:3000

The host will be listening for connections on port 3000.

Lastly, execute the hello function:

$ curl localhost:3000/hello/world && echo
Hello, world!