From fca84b92409f6cb9ad7f435cd5169566d3420adc Mon Sep 17 00:00:00 2001 From: michaelpivato Date: Sat, 11 May 2024 14:22:49 +0930 Subject: [PATCH] Add example wasm component and runner which embeds the component --- .gitignore | 2 + Cargo.lock | 1436 ++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 6 + README.md | 33 + component/Cargo.toml | 13 + component/src/lib.rs | 14 + component/wit/test.wit | 6 + runner/Cargo.toml | 7 + runner/src/main.rs | 37 ++ runner/wit/test.wit | 6 + 10 files changed, 1560 insertions(+) create mode 100644 .gitignore create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 README.md create mode 100644 component/Cargo.toml create mode 100644 component/src/lib.rs create mode 100644 component/wit/test.wit create mode 100644 runner/Cargo.toml create mode 100644 runner/src/main.rs create mode 100644 runner/wit/test.wit diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..36ee7c8 --- /dev/null +++ b/.gitignore @@ -0,0 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component, which simply calls a `hello()` function provided by the runner. + +### runner + +This package includes an example runtime, to run the built wasm component from the component package. + +## Build + +First run `cargo component build -p component --release` to build the wasm component. + +Then run `cargo run -p runner --release` to run the runner with the build wasm component from the previous step. + +## Troubleshooting + +If you see errors about imports missing when trying to run the compiled component, it's likely there's a dependency on std that isn't supported by the runtime linker (e.g. by calling `println!()`). +To build without std components, run the following: + +`cargo component build --target wasm32-unknown-unknown --release` + +Note this is only required when using std components. Preferably don't do this, and instead +use #![no_std] to not accidentally use std. Otherwise, you'll need to either use a runtime that includes std (e.g. wasmtime cli), or add the appropriate imports to the runtime linker. + +To check the imports and exports for a compiled .wasm component, run the following (where component.wasm is the compiled .wasm file to inspect): + +`wasm-tools component wit component.wasm` diff --git a/component/Cargo.toml b/component/Cargo.toml new file mode 100644 index 0000000..5fa5862 --- /dev/null +++ b/component/Cargo.toml @@ -0,0 +1,13 @@ +[package] +name = "component" +version = "0.1.0" +edition = "2021" + +[dependencies] +wit-bindgen-rt = { version = "0.24.0", features = ["bitflags"] } + +[lib] +crate-type = ["cdylib"] + +[package.metadata.component] +package = "component:test" diff --git a/component/src/lib.rs b/component/src/lib.rs new file mode 100644 index 0000000..e7ab24c --- /dev/null +++ b/component/src/lib.rs @@ -0,0 +1,14 @@ +#[allow(warnings)] +mod bindings; + +use bindings::{hello, Guest}; + +struct Component; + +impl Guest for Component { + fn greet() { + hello(); + } +} + +bindings::export!(Component with_types_in bindings); diff --git a/component/wit/test.wit b/component/wit/test.wit new file mode 100644 index 0000000..2d27e52 --- /dev/null +++ b/component/wit/test.wit @@ -0,0 +1,6 @@ +package my:project; + +world test { + import hello: func(); + export greet: func(); +} \ No newline at end of file diff --git a/runner/Cargo.toml b/runner/Cargo.toml new file mode 100644 index 0000000..415d4ab --- /dev/null +++ b/runner/Cargo.toml @@ -0,0 +1,7 @@ +[package] +name = "wasmtime-test" +version = "0.1.0" +edition = "2021" + +[dependencies] +wasmtime = {version = "20.0.2", features = ["component-model"]} \ No newline at end of file diff --git a/runner/src/main.rs b/runner/src/main.rs new file mode 100644 index 0000000..a0f9428 --- /dev/null +++ b/runner/src/main.rs @@ -0,0 +1,37 @@ +use wasmtime::{ + component::{bindgen, Component, Linker}, + Config, Engine, Store, +}; + +// Defaults to 'wit' folder adjacent to cargo.toml. +// Change folder by using: bindgen!(in "other/with/folder") +bindgen!(); + +struct TestState { + name: String, +} + +impl TestImports for TestState { + fn hello(&mut self) -> std::result::Result<(), wasmtime::Error> { + println!("{}", self.name); + Ok(()) + } +} + +fn main() -> wasmtime::Result<()> { + let mut config = Config::new(); + config.wasm_component_model(true); + let engine = Engine::new(&config)?; + let component = Component::from_file(&engine, "target/wasm32-wasi/release/component.wasm")?; + let mut linker = Linker::new(&engine); + Test::add_to_linker(&mut linker, |state: &mut TestState| state)?; + let mut store = Store::new( + &engine, + TestState { + name: "Hello World".to_string(), + }, + ); + let (bindings, _) = Test::instantiate(&mut store, &component, &linker)?; + bindings.call_greet(&mut store)?; + Ok(()) +} diff --git a/runner/wit/test.wit b/runner/wit/test.wit new file mode 100644 index 0000000..2d27e52 --- /dev/null +++ b/runner/wit/test.wit @@ -0,0 +1,6 @@ +package my:project; + +world test { + import hello: func(); + export greet: func(); +} \ No newline at end of file