WASM module built through Proxy-wasm RUST SDK can't be loaded due to missing imports: due to a missing import: __wbindgen_externref_xform__.__wbindgen_externref_table_grow

[marklu2018]

Reproduce steps:

1. Git clone the following WASM/RUST sample project:
   https://github.com/otomato-gh/proxy-wasm-rust

2. In the Cargo.toml file, add a 'reqwest' depedency
   [dependencies]
   reqwest = { version = "0.10" }

3. In src/lib.rs file, add:
   use reqwest::Client;

and in the on_http_request_headers(...) method body:
let _client = Client::new();

4. Build WASM using:
   cargo build --target=wasm32-unknown-unknown --release

5. Start Istio-proxy using docker-compose:
   docker-compose up --build

You will see the following error complaining:
[2020-08-21 18:49:31.113][6][critical][main] [external/envoy/source/server/server.cc:98] error initializing configuration '/etc/envoy.yaml': Failed to load WASM module due to a missing import: __wbindgen_externref_xform__.__wbindgen_externref_table_grow

[thinhtranquoc]

Hi @marklu2018

Do you resolve this issue? If yes, could you please share for me information.

Thanks

[PiotrSikora]

You aren't expected to use reqwest (which I suspect is the source of bindgen the issue) to make outgoing calls, this SDK provides dedicated functions to do that (dispatch_http_call, see: examples/http_auth_random.rs).

[bestgopher]

Hi, @marklu2018 @thinhtranquoc
Do you resolve this issue? If yes, could you please share for me information.

Thanks