mirror of
https://github.com/lune-org/lune.git
synced 2025-04-03 01:50:55 +01:00
135 lines
4.5 KiB
Rust
135 lines
4.5 KiB
Rust
use std::time::Duration;
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use async_trait::async_trait;
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use futures_util::Future;
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use mlua::prelude::*;
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use tokio::time::{sleep, Instant};
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use crate::lua::task::TaskKind;
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use super::super::{
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scheduler::TaskReference, scheduler::TaskScheduler, scheduler_handle::TaskSchedulerAsyncHandle,
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scheduler_message::TaskSchedulerMessage,
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};
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/*
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──────────────────────────────────────────────────────────
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Trait definition - same as the implementation, ignore this
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We use traits here to prevent misuse of certain scheduler
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APIs, making importing of them as intentional as possible
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──────────────────────────────────────────────────────────
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*/
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#[async_trait(?Send)]
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pub trait TaskSchedulerAsyncExt<'fut> {
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fn register_background_task(&self) -> TaskSchedulerAsyncHandle;
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fn schedule_async<'sched, R, F, FR>(
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&'sched self,
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thread: LuaThread<'_>,
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func: F,
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) -> LuaResult<TaskReference>
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where
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'sched: 'fut,
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R: IntoLuaMulti<'static>,
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F: 'static + Fn(&'static Lua) -> FR,
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FR: 'static + Future<Output = LuaResult<R>>;
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fn schedule_wait(
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&'fut self,
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reference: LuaThread<'_>,
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duration: Option<f64>,
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) -> LuaResult<TaskReference>;
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}
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/*
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────────────────────
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Trait implementation
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────────────────────
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*/
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#[async_trait(?Send)]
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impl<'fut> TaskSchedulerAsyncExt<'fut> for TaskScheduler<'fut> {
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/**
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Registers a new background task with the task scheduler.
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The returned [`TaskSchedulerAsyncHandle`] must have its
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[`TaskSchedulerAsyncHandle::unregister`] method called
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upon completion of the background task to prevent
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the task scheduler from running indefinitely.
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*/
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fn register_background_task(&self) -> TaskSchedulerAsyncHandle {
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let sender = self.futures_tx.clone();
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sender
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.send(TaskSchedulerMessage::Spawned)
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.unwrap_or_else(|e| {
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panic!(
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"\
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\nFailed to unregister background task - this is an internal error! \
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\nPlease report it at {} \
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\nDetails: {e} \
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",
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env!("CARGO_PKG_REPOSITORY")
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)
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});
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TaskSchedulerAsyncHandle::new(sender)
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}
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/**
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Schedules a lua thread or function
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to be resumed after running a future.
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The given lua thread or function will be resumed
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using the optional arguments returned by the future.
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*/
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fn schedule_async<'sched, R, F, FR>(
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&'sched self,
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thread: LuaThread<'_>,
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func: F,
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) -> LuaResult<TaskReference>
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where
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'sched: 'fut, // Scheduler must live at least as long as the future
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R: IntoLuaMulti<'static>,
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F: 'static + Fn(&'static Lua) -> FR,
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FR: 'static + Future<Output = LuaResult<R>>,
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{
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self.queue_async_task(thread, None, async move {
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match func(self.lua).await {
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Ok(res) => match res.into_lua_multi(self.lua) {
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Ok(multi) => Ok(Some(multi)),
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Err(e) => Err(e),
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},
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Err(e) => Err(e),
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}
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})
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}
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/**
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Schedules a task reference to be resumed after a certain amount of time.
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The given task will be resumed with the elapsed time as its one and only argument.
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*/
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fn schedule_wait(
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&'fut self,
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thread: LuaThread<'_>,
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duration: Option<f64>,
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) -> LuaResult<TaskReference> {
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let reference = self.create_task(TaskKind::Future, thread, None, true)?;
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// Insert the future
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let futs = self
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.futures
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.try_lock()
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.expect("Tried to add future to queue during futures resumption");
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futs.push(Box::pin(async move {
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let before = Instant::now();
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sleep(Duration::from_secs_f64(
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duration.unwrap_or_default().max(0.0),
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))
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.await;
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let elapsed_secs = before.elapsed().as_secs_f64();
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let args = elapsed_secs.into_lua_multi(self.lua).unwrap();
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(Some(reference), Ok(Some(args)))
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}));
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Ok(reference)
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}
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}
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