gmodx 0.3.0

A swiss army knife for creating binary modules for Garry's Mod in Rust
Documentation 
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use std::sync::Mutex;
use std::time::Duration;

use tokio::runtime::{Builder, Handle, Runtime};
use tokio::task::JoinHandle;
use tokio_util::task::TaskTracker;

use crate::lua;

struct TokioState {
    runtime: Runtime,
    handle: Handle,
    tracker: TaskTracker,
    graceful_shutdown_timeout: u32,
}

static STATE: Mutex<Option<TokioState>> = Mutex::new(None);

pub fn spawn<F>(fut: F) -> Option<JoinHandle<F::Output>>
where
    F: std::future::Future + Send + 'static,
    F::Output: Send + 'static,
{
    let g = STATE.lock().unwrap();
    let s = g.as_ref()?;
    Some(s.handle.spawn(s.tracker.track_future(fut)))
}

pub fn spawn_untracked<F>(fut: F) -> Option<JoinHandle<F::Output>>
where
    F: std::future::Future + Send + 'static,
    F::Output: Send + 'static,
{
    let g = STATE.lock().unwrap();
    let s = g.as_ref()?;
    Some(s.handle.spawn(fut))
}

fn get_max_worker_threads(l: lua::State) -> u16 {
    let mut max_worker_threads = 2;

    l.get_global(c"CreateConVar");
    let ok = l.pcall_ignore(|| {
        l.push_string("GMODX_WORKER_THREADS");
        l.push_number(max_worker_threads);
        l.create_table(2, 0);
        {
            l.get_global(c"FCVAR_ARCHIVE");
            let _ = l.raw_seti(-2, 1);

            l.get_global(c"FCVAR_PROTECTED");
            let _ = l.raw_seti(-2, 2);
        }
        l.push_string("Number of worker threads for the mysql connection pool");
        1
    });

    if ok && l.get_field(-1, c"GetInt").is_ok() {
        let ok2 = l.pcall_ignore(|| {
            l.push_value(-2);
            1
        });
        if ok2 {
            max_worker_threads = l.to_number(-1) as u16;
            l.pop();
        }
        l.pop();
    }

    max_worker_threads
}

fn get_graceful_shutdown_timeout(l: lua::State) -> u32 {
    let mut timeout = 20;

    l.get_global(c"CreateConVar");
    let ok = l.pcall_ignore(|| {
        l.push_string("GMODX_GRACEFUL_SHUTDOWN_TIMEOUT");
        l.push_number(timeout);
        l.create_table(2, 0);
        {
            l.get_global(c"FCVAR_ARCHIVE");
            let _ = l.raw_seti(-2, 1);

            l.get_global(c"FCVAR_PROTECTED");
            let _ = l.raw_seti(-2, 2);
        }
        l.push_string("Timeout for graceful shutdown of the mysql connections, in seconds");
        1
    });

    if ok && l.get_field(-1, c"GetInt").is_ok() {
        let ok2 = l.pcall_ignore(|| {
            l.push_value(-2);
            1
        });
        if ok2 {
            timeout = l.to_number(-1) as u32;
            l.pop();
        }
        l.pop();
    }

    timeout
}

inventory::submit! {
    crate::open_close::new(
        3,
        "tokio_tasks",
        |l| {
            let worker_threads = get_max_worker_threads(l) as usize;
            let graceful_shutdown_timeout = get_graceful_shutdown_timeout(l);

            let runtime = Builder::new_multi_thread()
                .worker_threads(worker_threads)
                .enable_all()
                .thread_name(format!("gmodx-rs:{}", env!("CARGO_PKG_VERSION")))
                .build()
                .expect("failed to build tokio runtime");

            let tracker = TaskTracker::new();

            let mut g = STATE.lock().unwrap();
            *g = Some(TokioState {
                handle: runtime.handle().clone(),
                runtime,
                tracker,
                graceful_shutdown_timeout,
            });
        },
        |_| {
            // take ownership so we can drop everything cleanly after shutdown
            let s = {
                let mut g = STATE.lock().unwrap();
                g.take()
            };
            let Some(s) = s else { return };

            let timeout = Duration::from_secs(s.graceful_shutdown_timeout as u64);

            // close new task intake and wait for tracked tasks to finish (with timeout)
            s.tracker.close();
            let _ = s
                .runtime
                .block_on(async { tokio::time::timeout(timeout, s.tracker.wait()).await });

            s.runtime.shutdown_timeout(timeout);
        },
    )
}