Is there a faster way to send data from rust to webview?

[xuchaoqian]

In our use case, we need send a large set of dynamic data(about 200,000 rows) from rust to webview repeatedly.

We use window.eval right now, it takes more than 16 seconds to finish data transfer. Even worse, the UI will be blocked in the meantime.

Just clone the repo to run the demo:
cd tauri-examples/from-rust-to-webview/ && npm install --verbose && npm run tauri dev

Is there a faster way to send data from rust to webview?

[FabianLars]

Sending this much data will probably always be problematic. Btw, try comparing debug vs release mode, there should be a relatively big difference.

The only built-in alternative would be custom protocols https://docs.rs/tauri/latest/tauri/struct.Builder.html#method.register_uri_scheme_protocol. Here's an example app using it for image data: https://github.com/JonasKruckenberg/pisano/ - Our new IPC will very likely build on that same system and we're trying to implement streaming support too.

Other than that there are only separate things like hosting a localhost http or ws server :/

[FabianLars]

So, we will still need serialization-deserialization, even if use custom protocols. Is it right?

Yes and no. You still need to have a shared representation format yes, but custom protocols don't require json strings as their payload which means you can send binary data without converting it to a string first. Also they seem to be slightly faster even with the same payload.

Btw., very interesting to see the streaming support solution. Can I use custom protocols to implement it right now?

No, it needs to be implemented in Wry first, unless the streaming-like implementation shown in our example is what you're looking for.

[xuchaoqian]

You still need to have a shared representation format yes

Is it possible to create a JS ArrayBuffer in rust backend, and transfer the ownership of this ArrayBuffer to webview?

[FabianLars]

Nope

[xuchaoqian]

Thanks a lot.

[notdanilo]

You still need to have a shared representation format yes

Is it possible to create a JS ArrayBuffer in rust backend, and transfer the ownership of this ArrayBuffer to webview?

That would be the most optimal way to do it. I wonder what it takes to get it done.

[JohnScience]

I found Medium article "Practice Rust and TAURI: Make an Image Viewer #4" quite useful.