Dima (Dec 20 2023 at 12:05): Dima (Dec 20 2023 at 12:05):Hi there!
I have a code:
// Set up Wasmtime components
let mut config = Config::new();
config.wasm_component_model(true);
let engine = Engine::new(&config)?;
let component = Component::new(&engine, decoded_input)?;
// Set up Wasmtime linker
let mut linker = Linker::new(&engine);
MyWorld::add_to_linker(&mut linker, |state: &mut MyState| state)?;
// Set up Wasmtime store
let mut store = Store::new(&engine, MyState);
let (bindings, _) = MyWorld::instantiate(&mut store, &component, &linker)?;
I've updated guest code so it needs wasi now:
package root:component;
world root {
import levo:portal/my-imports;
import wasi:io/error@0.2.0-rc-2023-11-10;
import wasi:io/streams@0.2.0-rc-2023-11-10;
import wasi:filesystem/types@0.2.0-rc-2023-11-10;
import wasi:filesystem/preopens@0.2.0-rc-2023-11-10;
import wasi:sockets/tcp@0.2.0-rc-2023-11-10;
import wasi:cli/environment@0.2.0-rc-2023-11-10;
import wasi:cli/exit@0.2.0-rc-2023-11-10;
import wasi:cli/stdin@0.2.0-rc-2023-11-10;
import wasi:cli/stdout@0.2.0-rc-2023-11-10;
import wasi:cli/stderr@0.2.0-rc-2023-11-10;
import wasi:cli/terminal-input@0.2.0-rc-2023-11-10;
import wasi:cli/terminal-output@0.2.0-rc-2023-11-10;
import wasi:cli/terminal-stdin@0.2.0-rc-2023-11-10;
import wasi:cli/terminal-stdout@0.2.0-rc-2023-11-10;
import wasi:cli/terminal-stderr@0.2.0-rc-2023-11-10;
export update: func();
export setup: func();
}
How can I provide wasi environment to my wasm component wasmtime execution?
I've tried wasmtime-wasi and I think the answer is to use Preview2 but is there any code example how to achieve it? I think spin app uses component model and wasi but I wasn't able to figure out how to adjust my code accordingly, to support wasi with my wasm component.
Thank you,
Dima :)
Pat Hickey (Dec 20 2023 at 20:52):https://docs.rs/wasmtime-wasi/latest/wasmtime_wasi/preview2/command/fn.add_to_linker.html
Pat Hickey (Dec 20 2023 at 20:52):or command::sync::add_to_linker if you are not using Config::async_support
Dima (Dec 22 2023 at 12:33):Pat Hickey said:
or command::sync::add_to_linker if you are not using Config::async_support
Thanks! Is there a way to pass to the guest app host imports when using wasi with component model?
I have something like this:
struct MyCtx {
table: Table,
wasi: WasiCtx,
}
impl WasiView for MyCtx {
fn table(&self) -> &Table {
&self.table
}
fn table_mut(&mut self) -> &mut Table {
&mut self.table
}
fn ctx(&self) -> &WasiCtx {
&self.wasi
}
fn ctx_mut(&mut self) -> &mut WasiCtx {
&mut self.wasi
}
}
// #[async_trait::async_trait]
impl Host for MyCtx {
fn gen_random_integer(&mut self) -> wasmtime::Result<u32> {
Ok(rand::thread_rng().next_u32())
}
fn print(&mut self, from_wasm: String) -> wasmtime::Result<(), wasmtime::Error> {
dbg!(from_wasm);
Ok(())
}
}
...
...
...
// Set up Wasmtime components
let mut config = Config::new();
config.wasm_component_model(true).async_support(true);
let engine = Engine::new(&config)?;
let component = Component::new(&engine, decoded_input)?;
// Set up Wasmtime linker
let mut linker = Linker::new(&engine);
add_to_linker(&mut linker)?;
let table = Table::new();
let wasi = WasiCtxBuilder::new()
.build();
// Set up Wasmtime store
let mut store = Store::new(&engine, MyCtx { table, wasi });
let (bindings, _) = MyWorld::instantiate_async(&mut store, &component, &linker).await?;
Unfortunately it doesn't work: it doesn't see that imports implementation for print and gen_random_integer were provided. I feel I am missing something obvious.
Lann Martin (Dec 22 2023 at 13:50):You probably need an additional call to Host::add_to_linker; see HelloWorld::add_to_linker in the bindgen example.
Notification Bot (Dec 22 2023 at 14:45):Dima has marked this topic as resolved.
Last updated: Dec 23 2024 at 12:05 UTC