#live #view #result #events #handler #sockets #event #event-handling

submillisecond-live-view

A LiveView implementation for the submillisecond web framework

6 releases

0.4.1 Jun 19, 2023
0.4.0 Dec 1, 2022
0.3.2 Nov 30, 2022
0.1.0 Nov 12, 2022

36 downloads per month

MIT/Apache

390KB
7.5K SLoC

JavaScript 5K SLoC // 0.0% comments Rust 2.5K SLoC // 0.0% comments

Submillisecond LiveView

A LiveView implementation for the submillisecond web framework built with lunatic.

What is LiveView?

LiveView provides rich, real-time user experiences with server-rendered HTML.

The LiveView programming model is declarative: instead of saying "once event X happens, change Y on the page", events in LiveView are regular messages which may cause changes to its state. Once the state changes, LiveView will re-render the relevant parts of its HTML template and push it to the browser, which updates itself in the most efficient manner. This means developers write LiveView templates as any other server-rendered HTML and LiveView does the hard work of tracking changes and sending the relevant diffs to the browser.

It was made popular by the Phoenix webframework for Elixir.

Prerequisites

Lunatic runtime is required, along with the wasm32-wasi target.

cargo install lunatic-runtime
rustup target add wasm32-wasi

It is also recommended to add a .cargo/config.toml file with the build target and runner configured.

# .cargo/config.toml

[build]
target = "wasm32-wasi"

[target.wasm32-wasi]
runner = "lunatic"

Code example

use serde::{Deserialize, Serialize};
use submillisecond::{router, static_router, Application};
use submillisecond_live_view::prelude::*;

fn main() -> std::io::Result<()> {
    Application::new(router! {
        "/" => Counter::handler("index.html", "#app")
        "/static" => static_router!("./static")
    })
    .serve("127.0.0.1:3000")
}

#[derive(Clone, Serialize, Deserialize)]
struct Counter {
    count: i32,
}

impl LiveView for Counter {
    type Events = (Increment, Decrement);

    fn mount(_uri: Uri, _socket: Option<&mut Socket>) -> Self {
        Counter { count: 0 }
    }

    fn render(&self) -> Rendered {
        html! {
            button @click=(Increment) { "Increment" }
            button @click=(Decrement) { "Decrement" }
            p { "Count is " (self.count) }
        }
    }
}

#[derive(Deserialize)]
struct Increment {}

impl LiveViewEvent<Increment> for Counter {
    fn handle(state: &mut Self, _event: Increment) {
        state.count += 1;
    }
}

#[derive(Deserialize)]
struct Decrement {}

impl LiveViewEvent<Decrement> for Counter {
    fn handle(state: &mut Self, _event: Decrement) {
        state.count -= 1;
    }
}

Running examples

Clone the repository

git clone git@github.com:lunatic-solutions/submillisecond-live-view.git
cd submillisecond-live-view

Run an example

cargo run --example clock

License

Licensed under either of

at your option.

Dependencies

~13–22MB
~298K SLoC