waPC

This is the Rust implementation of the waPC standard for WebAssembly host runtimes. It allows any WebAssembly module to be loaded as a guest and receive requests for invocation as well as to make its own function requests of the host.

Example

The following is a simple example of synchronous, bi-directional procedure calls between a WebAssembly host runtime and the guest module.

```rust extern crate wapc; use wapc::prelude::*;

pub fn main() -> Result<(), Box> { let module = load_file(); let mut host = WapcHost::new(&module)?;

wapc::set_host_callback(host_callback);
let res = host.call("wapc:sample!Hello", b"this is a test")?;
assert_eq!(res, b"hello world!");
Ok(())

}

fn host_callback(op: &str, payload: &[u8]) -> Result, Box> { println!("Guest invoked '{}' with payload of {} bytes", op, payload.len()); Ok(vec![]) } ```