mlua-luau-scheduler/examples/scheduler_ordering.rs

#![allow(clippy::missing_errors_doc)]

use std::time::{Duration, Instant};

use async_io::{block_on, Timer};

use mlua::prelude::*;
use mlua_luau_runtime::Runtime;

const MAIN_SCRIPT: &str = include_str!("./lua/scheduler_ordering.luau");

pub fn main() -> LuaResult<()> {
    tracing_subscriber::fmt::init();

    // Set up persistent Lua environment
    let lua = Lua::new();
    let rt = Runtime::new(&lua);

    lua.globals().set("spawn", rt.create_spawn_function()?)?;
    lua.globals().set("defer", rt.create_defer_function()?)?;
    lua.globals().set(
        "sleep",
        lua.create_async_function(|_, duration: Option<f64>| async move {
            let duration = duration.unwrap_or_default().max(1.0 / 250.0);
            let before = Instant::now();
            let after = Timer::after(Duration::from_secs_f64(duration)).await;
            Ok((after - before).as_secs_f64())
        })?,
    )?;

    // Load the main script into a runtime
    let main = lua.load(MAIN_SCRIPT);
    rt.spawn_thread(main, ())?;

    // Run until completion
    block_on(rt.run());

    Ok(())
}

#[test]
fn test_scheduler_ordering() -> LuaResult<()> {
    main()
}