Dan Gohman (Oct 25 2023 at 18:00): Dan Gohman (Oct 25 2023 at 18:00):Does anyone have an example repo showing how to write a component that works with wasmtime serve?
Trevor Elliott (Oct 25 2023 at 18:04):there's the test programs that start with api_proxy in crates/test-programs/src/bin, but i'm not aware of any others
Till Schneidereit (Oct 25 2023 at 18:13):a minimal C example is just
#include "bindings.h"
void exports_wasi_http_incoming_handler_handle(
bindings_own_incoming_request_t request,
bindings_own_response_outparam_t response_out) {
printf("hello world");
}
I'm working on an example repo, using that api_proxy.rs as a starting point, as I'm talking with folks interested in seeing a step-by-step for setting the whole thing up. It takes some care to get the right wits etc.
Trevor Elliott (Oct 25 2023 at 18:25):awesome! happy to help out with that if there's any work you'd like to hand off :)
Dan Gohman (Oct 25 2023 at 18:27):I checked out the release-14.0.0 branch to match the wasmtime serve in the 14.0 release, but that doesn't have the api_proxy.rs example in it. I'll try copying the example from trunk and let's see what happens
Dan Gohman (Oct 25 2023 at 18:39):Ok, I got to this repo: https://github.com/sunfishcode/hello-wasi-http and cargo component build says
error: failed to create a target world for package `hello-wasi-http` (/home/dev/wasm/hello-wasi-http/Cargo.toml)
Caused by:
0: failed to merge local target `/home/dev/wasm/hello-wasi-http/wit`
1: package not found
--> /home/dev/wasm/hello-wasi-http/wit/command-extended.wit:4:10
|
4 | import wasi:clocks/wall-clock@0.2.0-rc-2023-10-18;
| ^----------
you might run into issues with the adapter version... you can build the wasi-http-proxy-tests crate in the 14.x branch for an example program that's pretty much the same as api_proxy.rs
Dan Gohman (Oct 25 2023 at 18:46):I was hoping to come up with something I could build outside of the Wasmtime tree.
Dan Gohman (Oct 25 2023 at 18:53):I think the thing to do is to get cargo component to have an adapter that matches Wasmtime 14
Dan Gohman (Oct 25 2023 at 18:54):ah, it looks like it already does
Trevor Elliott (Oct 25 2023 at 18:56):the monotonic-clock interface in your repo is lacking a package decl, was that intentional?
Dan Gohman (Oct 25 2023 at 18:57):no, it's copied verbatim from Wasmtime
Trevor Elliott (Oct 25 2023 at 19:09):ah, you need to manually tell cargo component about the deps. you can resolve the first error with:
cargo component add --target --path wit/deps/clocks wasi:clocks
i sent you a pr that resolves the wit issues, though build issues with the generate macro remain
Trevor Elliott (Oct 25 2023 at 19:32):https://github.com/sunfishcode/hello-wasi-http/pull/1
Dan Gohman (Oct 25 2023 at 21:45):Thanks for your help, and thanks also to @Peter Huene for help and a key cargo component fix, I have a working demo now!
Dan Gohman (Oct 25 2023 at 21:45):https://github.com/sunfishcode/hello-wasi-http#hello-wasi-http
Pat Hickey (Oct 26 2023 at 05:50):Hooray! Thank you for writing this!
Last updated: Oct 23 2024 at 20:03 UTC