bytecodealliance / bytecodealliance/wac
Error: resource types are not the same when composing components
- Dominant language
- Rust
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Description
I'm trying to wrap a component that implments wasi:http/incoming-handler into a different api. The way I'm trying to accomplish this is by having two different components that will be composed with it.
1. Exports the wasi:http/types interface + some extensions. This will be composed with (2) and (3) and has otherwise no imports (except other wasi interfaces)
2. The wrapped component. This imports wasi:http/types and exports wasi:http/incoming-handler.
3. A component providing the new api. This imports wasi:http/types, wasi:http/incoming-handler, the extensions from (1) and exports the new api.
---
Problem is that when I try composing the wasm, it errors with:
```
❯ wac plug adapter.wasm --plug types.wasm -o adapter-plugged.wasm
error: encoding produced a component that failed validation
Caused by:
type mismatch for import `wasi:http/incoming-handler@0.2.3`
type mismatch in instance export `incoming-request`
resource types are not the same (ResourceId { globally_unique_id: 2, contextually_unique_id: 8 } vs. ResourceId { globally_unique_id: 2, contextually_unique_id: 57 }) (at offset 0x4e0399)
```
This error shows up both for `wac plug` and `wac compose`.
---
Wits look as follows:
Component 1:
```
package poc:types;
interface extensions {
use wasi:http/types@0.2.3.{method, scheme, status-code, incoming-request, response-outparam};
type fields = list>>;
type body = list;
record body-and-trailers {
body: body,
trailers: option
}
record request {
method: method,
path-with-query: string,
scheme: scheme,
authority: string,
headers: fields,
body-and-trailers: option
}
record response {
status: status-code,
body: option
}
resource response-outparam-proxy {
constructor();
new-outparam: func() -> response-outparam;
get-response: func() -> response;
}
new-wasi-http-request: func(request: request) -> incoming-request;
}
world api {
export wasi:http/types@0.2.3;
export extensions
}
```
Component 2:
```
package poc:handler;
world api {
import wasi:http/types@0.2.3;
export wasi:http/incoming-handler@0.2.3;
}
```
Component 3:
```
package poc:adapter;
interface adapted-api {
use poc:types/extensions.{request, response};
handle: func(request: request) -> response;
}
world api {
import wasi:http/incoming-handler@0.2.3;
import wasi:http/types@0.2.3;
import poc:types/extensions;
export adapted-api;
}
```
---
I suspect this is a similiar error to https://github.com/bytecodealliance/wasm-tools/issues/1565. [This comment](https://github.com/bytecodealliance/wasm-tools/issues/1565#issuecomment-2377631296) provided a reproduction that fails with the same error.
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