Limited Web (Wasm through js_sys) layer for code reuse ?

[Wicpar]

Hi,

I was wondering if there was a way to reuse code written with this lib in a frontend wasm project, obviously not all features, but maybe a subset.

[evan-brass]

I've been using a fork of this project compiled to WASM and running it inside Deno for a couple weeks now: [https://github.com/evan-brass/webrtc-deno]. Specifically I'm using the SCTP crate (which depends on Util), and I've tried using the DataChannel crate. Some of the other crates compile, but I don't really know which of them actually work.

I made some ugly patches to get it to work for my use case:

• Removing Send and Sync from all the async stuff
• Switching all the tokio::spawn() to be wasm_bindgen_futures::spawn()
• Adding a mock SystemTime that uses js_sys instead of tokio::SystemTime
• Mock UDPSocket that wraps around Deno's tcp/udp sockets
• Eventually I intend to use Mbedtls to replace RusTLS: https://github.com/evan-brass/Mbedtls.js-sys/tree/please-rust-please
• More stuff that I forgot..

Which pieces were you wanting to use?

If you have any questions about mixing webrtc-rs and wasm, I might be able to help.

[Wicpar]

You can't open sockets like you want inside a browser, you are forced to use the Webrtc API through JS, so it requires two codebases for the client and the server. i was wondering if there is a project that allows writing for both at the same time. Essentially the server behaves like an additional peer, with a few extra features so having the same codebase would be advantageous.

[evan-brass]

I'm not aware of a crate that provides a common interface and wraps over webrtc-rs and web_sys::RtcPeerConnection, but I also haven't looked. Maybe one of the maintainers knows of one?

[k0nserv]

There's been previous discussions to this effect in Discord. As you identify we cannot run via WASM in the browser since direct socket access is not possible, but Pion implements a WASM shim that allows using Pion and the browser WebRTC API transparently(What @evan-brass suggests). We should be able to port this over from Pion.

The various files named *_js.go in pion/webrtc are worth reviewing for inspiration

[alexipeck]

Not sure how related to this issue it is, but how do-able would it be to have at least the types be supported under wasm32 without having to shadow them? The specific types needed would be RTCSessionDescription, RTCIceCandidateInit and RTCIceServer