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Run WASM Module as Executable

wasmtime​

Doc: https://github.com/bytecodealliance/wasmtime

// hello.rs
fn main() {
    println!("Hello, world!");
}
rustup target add wasm32-wasi
rustc hello.rs --target wasm32-wasi
wasmtime hello.wasm
> Hello, world!

Wasmer​

YouTube: WebAssembly On The Server??? Why?

WASI​

WASI provides some system APIs such as file system.

Tut: https://github.com/bytecodealliance/wasmtime/blob/main/docs/WASI-tutorial.md

rustup target add wasm32-wasi
cargo build --target wasm32-wasi    # build main.rs into wasm32-wasi
# run the program
echo "hello world!" > a.txt # construct a example file
wasmtime --dir=. target/wasm32-wasi/debug/wasm-tut.wasm a.txt b.txt  # run the wasm module, give cwd permission with --dir=.
wasmer --dir=. target/wasm32-wasi/debug/wasm-tut.wasm a.txt b.txt # wasmer can also be used to run the module