feat: viz integration

[fundon]

Viz is a fast, flexible, lightweight web framework.

Repo: https://github.com/viz-rs/viz
Website: https://viz.rs/

• leptos-viz
• examples

If you don't think it makes sense to put it in the leptos project, you can close it. :)

[gbj]

Cool! Are you still working on the integration or is this ready to review?

EDIT: Never mind you titled it WIP haha. Just let me know when it's ready.

[fundon]

I'm done updating and ready to review.

[gbj]

Thanks for your work on this. I'm not very familiar with Viz, but it looks like the internals are very similar to Axum... diffing this against the Axum integration it looks like there's a lot of shared code that could probably do with a refactor. Same goes for the examples, of course.

I'm working on another PR that is already doing some refactoring of the integrations, so I'm happy to take this as is for now, and handle the refactoring as part of that other work.

On the examples, on the other hand — rather than duplicating three existing examples, could you please pick one to highlight Viz and remove the other two? This will reduce the maintenance burden for me over time if and when we need to update the application code in examples.

[fundon]

Thank you for your reply.

Yes, they are somewhat similar. We can extract some common functions.

I'll wait for you to finish that PR and refactor this one.

It feels like we can just keep the sqlite example.

[gbj]

@fundon I've merged the other PR — So if you compare what you did for leptos_viz to the version of leptos_axum that's in main now, you should be able to apply more or less the same set of changes you did earlier, and get support for in-order streaming and async rendering out of the box. I wasn't able to refactor quite as much as I'd hoped but every bit counts. Let me know if you run into any issues and I hope this doesn't cause you to duplicate too much of your work.

[fundon]

@gbj I have merged the latest changes and only keep the sqlite example.

If you come across viz related later, you can tell me and I can maintain this part of the code. :)

[gbj]

Thanks! This is great.

The doctests are failing on

---- src/lib.rs - render_app_async (line 746) stdout ----
error[E0423]: expected function, tuple struct or tuple variant, found struct `ServiceMaker`
  --> src/lib.rs:776:16
   |
33 |         .serve(ServiceMaker(app))
   |                ^^^^^^^^^^^^^^^^^ help: use struct literal syntax instead: `ServiceMaker { tree: val }`
   |
  ::: /home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/viz-0.4.8/src/server/service.rs:18:1
   |
18 | pub struct ServiceMaker {
   | ----------------------- `ServiceMaker` defined here

[fundon]

@gbj It has been fixed.

[gbj]

Thanks for your work! I've merged this. I'll release a leptos_viz package as part of our little world of packages during the next release cycle, if that's all right with you.