Trait WasiView

source

pub trait WasiView: Send {
    // Required methods
    fn table(&mut self) -> &mut ResourceTable;
    fn ctx(&mut self) -> &mut WasiCtx;
}

Expand description

A trait which provides access to internal WASI state.

This trait is the basis of implementation of all traits in this crate. All traits are implemented like:

impl<T: WasiView> bindings::wasi::Host for T {
    // ...
}

For a Store<T> this trait will be implemented for the T. This also corresponds to the T in Linker<T>.

§Example

use wasmtime_wasi::{WasiCtx, ResourceTable, WasiView, WasiCtxBuilder};

struct MyState {
    ctx: WasiCtx,
    table: ResourceTable,
}

impl WasiView for MyState {
    fn ctx(&mut self) -> &mut WasiCtx { &mut self.ctx }
    fn table(&mut self) -> &mut ResourceTable { &mut self.table }
}

impl MyState {
    fn new() -> MyState {
        let mut wasi = WasiCtxBuilder::new();
        wasi.arg("./foo.wasm");
        wasi.arg("--help");
        wasi.env("FOO", "bar");

        MyState {
            ctx: wasi.build(),
            table: ResourceTable::new(),
        }
    }
}