wasmtime / issue #7579 The error I encountered when tryin... · git-wasmtime

Stream: git-wasmtime

Topic: wasmtime / issue #7579 The error I encountered when tryin...

Wasmtime GitHub notifications bot (Nov 23 2023 at 08:23):

This is WIT:

package local:demo;

interface host{
    log: func(msg: string);
}

world my-world {
  import host;
  export run: func();
}

This is component code:

use crate::local::demo::host::log;
// Use a procedural macro to generate bindings for the world we specified in
// `host.wit`
wit_bindgen::generate!({
    // the name of the world in the `*.wit` input file
    world: "my-world",

    // For all exported worlds, interfaces, and resources, this specifies what
    // type they're corresponding to in this module. In this case the `MyHost`
    // struct defined below is going to define the exports of the `world`,
    // namely the `run` function.
    exports: {
        world: MyWord,
    },
});

// Define a custom type and implement the generated `Guest` trait for it which
// represents implementing all the necessary exported interfaces for this
// component.
struct MyWord;

impl Guest for MyWord {
    fn run() {
        log("Hello, world!");
    }
}

wasm-tools component new ./target/wasm32-wasi/debug/wasm_test2.wasm -o my-world.wasm --adapt ./wasi_snapshot_preview1.reactor.wasm

This is the relevant call code：

use wasmtime::{Config, Engine, Store};
use wasmtime::component::bindgen;
use wasmtime::component::Component;
use wasmtime::component::Linker;
use crate::local::demo::host::Host;

bindgen!();

struct MyState {
}

impl Host for MyState{
    fn log(&mut self, msg: String) -> wasmtime::Result<()> {
        Ok(println!("{msg}"))
    }
}

fn main() -> wasmtime::Result<()> {
    // Configure an `Engine` and compile the `Component` that is being run for
    // the application.
    let mut config = Config::new();
    config.wasm_component_model(true);
    let engine = Engine::new(&config)?;
    let component = Component::from_file(&engine, "./my-world.wasm")?;
    let mut store = Store::new(
        &engine,
        MyState {},
    );
    let mut linker:Linker<MyState> = Linker::new(&engine);
    MyWorld::add_to_linker(&mut linker, |state: &mut MyState| state)?;
    let (bindings, _) = MyWorld::instantiate(&mut store, &component, &linker)?;
    Ok(bindings.call_run(&mut store)?)
}

Error: import `wasi:io/error@0.2.0-rc-2023-11-10` has the wrong type

Caused by:
    0: instance export `error` has the wrong type
    1: expected resource found nothing

Wasmtime GitHub notifications bot (Nov 23 2023 at 08:32):

tmtbe commented on issue #7579:

My wasmtime version is 15.0.0 ,the adpate wasm version is 15.0.0 too.

Wasmtime GitHub notifications bot (Nov 23 2023 at 09:02):

tmtbe commented on issue #7579:

When I switch to 14.0.4 I still get the error, I don't know what caused it：
Error: import `wasi:io/streams@0.2.0-rc-2023-10-18` has the wrong type

Caused by:
    0: instance export `output-stream` has the wrong type
    1: expected resource found nothing
The version of the adapter is consistent with the wasmtime library.

Wasmtime GitHub notifications bot (Nov 23 2023 at 09:30):

tmtbe commented on issue #7579:

I forgot to add wasmtime-wasi = "15.0.0" dependency, now no problem

Wasmtime GitHub notifications bot (Nov 23 2023 at 09:30):

tmtbe closed issue #7579:

This is WIT:

package local:demo;

interface host{
    log: func(msg: string);
}

world my-world {
  import host;
  export run: func();
}

This is component code:

use crate::local::demo::host::log;
// Use a procedural macro to generate bindings for the world we specified in
// `host.wit`
wit_bindgen::generate!({
    // the name of the world in the `*.wit` input file
    world: "my-world",

    // For all exported worlds, interfaces, and resources, this specifies what
    // type they're corresponding to in this module. In this case the `MyHost`
    // struct defined below is going to define the exports of the `world`,
    // namely the `run` function.
    exports: {
        world: MyWord,
    },
});

// Define a custom type and implement the generated `Guest` trait for it which
// represents implementing all the necessary exported interfaces for this
// component.
struct MyWord;

impl Guest for MyWord {
    fn run() {
        log("Hello, world!");
    }
}

wasm-tools component new ./target/wasm32-wasi/debug/wasm_test2.wasm -o my-world.wasm --adapt ./wasi_snapshot_preview1.reactor.wasm

This is the relevant call code：

use wasmtime::{Config, Engine, Store};
use wasmtime::component::bindgen;
use wasmtime::component::Component;
use wasmtime::component::Linker;
use crate::local::demo::host::Host;

bindgen!();

struct MyState {
}

impl Host for MyState{
    fn log(&mut self, msg: String) -> wasmtime::Result<()> {
        Ok(println!("{msg}"))
    }
}

fn main() -> wasmtime::Result<()> {
    // Configure an `Engine` and compile the `Component` that is being run for
    // the application.
    let mut config = Config::new();
    config.wasm_component_model(true);
    let engine = Engine::new(&config)?;
    let component = Component::from_file(&engine, "./my-world.wasm")?;
    let mut store = Store::new(
        &engine,
        MyState {},
    );
    let mut linker:Linker<MyState> = Linker::new(&engine);
    MyWorld::add_to_linker(&mut linker, |state: &mut MyState| state)?;
    let (bindings, _) = MyWorld::instantiate(&mut store, &component, &linker)?;
    Ok(bindings.call_run(&mut store)?)
}

Error: import `wasi:io/error@0.2.0-rc-2023-11-10` has the wrong type

Caused by:
    0: instance export `error` has the wrong type
    1: expected resource found nothing

Wasmtime GitHub notifications bot (Nov 23 2023 at 09:40):

tmtbe deleted a comment on issue #7579:

I forgot to add wasmtime-wasi = "15.0.0" dependency, now no problem

Wasmtime GitHub notifications bot (Nov 23 2023 at 09:40):

tmtbe reopened issue #7579:

This is WIT:

package local:demo;

interface host{
    log: func(msg: string);
}

world my-world {
  import host;
  export run: func();
}

This is component code:

use crate::local::demo::host::log;
// Use a procedural macro to generate bindings for the world we specified in
// `host.wit`
wit_bindgen::generate!({
    // the name of the world in the `*.wit` input file
    world: "my-world",

    // For all exported worlds, interfaces, and resources, this specifies what
    // type they're corresponding to in this module. In this case the `MyHost`
    // struct defined below is going to define the exports of the `world`,
    // namely the `run` function.
    exports: {
        world: MyWord,
    },
});

// Define a custom type and implement the generated `Guest` trait for it which
// represents implementing all the necessary exported interfaces for this
// component.
struct MyWord;

impl Guest for MyWord {
    fn run() {
        log("Hello, world!");
    }
}

wasm-tools component new ./target/wasm32-wasi/debug/wasm_test2.wasm -o my-world.wasm --adapt ./wasi_snapshot_preview1.reactor.wasm

This is the relevant call code：

use wasmtime::{Config, Engine, Store};
use wasmtime::component::bindgen;
use wasmtime::component::Component;
use wasmtime::component::Linker;
use crate::local::demo::host::Host;

bindgen!();

struct MyState {
}

impl Host for MyState{
    fn log(&mut self, msg: String) -> wasmtime::Result<()> {
        Ok(println!("{msg}"))
    }
}

fn main() -> wasmtime::Result<()> {
    // Configure an `Engine` and compile the `Component` that is being run for
    // the application.
    let mut config = Config::new();
    config.wasm_component_model(true);
    let engine = Engine::new(&config)?;
    let component = Component::from_file(&engine, "./my-world.wasm")?;
    let mut store = Store::new(
        &engine,
        MyState {},
    );
    let mut linker:Linker<MyState> = Linker::new(&engine);
    MyWorld::add_to_linker(&mut linker, |state: &mut MyState| state)?;
    let (bindings, _) = MyWorld::instantiate(&mut store, &component, &linker)?;
    Ok(bindings.call_run(&mut store)?)
}

Error: import `wasi:io/error@0.2.0-rc-2023-11-10` has the wrong type

Caused by:
    0: instance export `error` has the wrong type
    1: expected resource found nothing

Wasmtime GitHub notifications bot (Nov 23 2023 at 09:49):

tmtbe commented on issue #7579:

It needs wasmtime_wasi::preview2::command::sync::add_to_linker(&mut linker)?; for it to work but I don't know where the documentation is.

Wasmtime GitHub notifications bot (Nov 27 2023 at 04:23):

alexcrichton commented on issue #7579:

Yes the "problem" here in a sense is the --adapt ./wasi_snapshot_preview1.reactor.wasm argument you're passing. The world my-world annotation doesn't actually fully describe the world of this component because through the adapter the component is going to need to additionally import WASI interfaces. If you use wasm-tools component wit my-world.wasm you'll see that the component imports WASI interfaces.

To provide WASI interfaces in the linker you're going to want to use the wasmtime_wasi::preview2::* APIs.

Wasmtime GitHub notifications bot (Nov 27 2023 at 04:23):

alexcrichton commented on issue #7579:

Ah sorry, you've already found this. Currently WASI is not documented well, and that's something we should improve.

Last updated: Dec 23 2024 at 12:05 UTC