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use deno_core::error::AnyError;
use deno_core::futures;
use deno_core::futures::channel::oneshot;
use deno_core::futures::FutureExt;
use deno_core::futures::TryFutureExt;
use deno_core::include_js_files;
use deno_core::op_async;
use deno_core::op_sync;
use deno_core::Extension;
use deno_core::OpState;
use std::cell::RefCell;
use std::future::Future;
use std::pin::Pin;
use std::rc::Rc;
use std::thread::sleep;
use std::time::Duration;
use std::time::Instant;
pub trait TimersPermission {
fn allow_hrtime(&mut self) -> bool;
fn check_unstable(&self, state: &OpState, api_name: &'static str);
}
pub fn init<P: TimersPermission + 'static>() -> Extension {
Extension::builder()
.js(include_js_files!(
prefix "deno:ext/timers",
"01_timers.js",
"02_performance.js",
))
.ops(vec![
("op_global_timer_stop", op_sync(op_global_timer_stop)),
("op_global_timer_start", op_sync(op_global_timer_start)),
("op_global_timer", op_async(op_global_timer)),
("op_now", op_sync(op_now::<P>)),
("op_sleep_sync", op_sync(op_sleep_sync::<P>)),
])
.state(|state| {
state.put(GlobalTimer::default());
state.put(StartTime::now());
Ok(())
})
.build()
}
pub type StartTime = Instant;
type TimerFuture = Pin<Box<dyn Future<Output = Result<(), ()>>>>;
#[derive(Default)]
pub struct GlobalTimer {
tx: Option<oneshot::Sender<()>>,
pub future: Option<TimerFuture>,
}
impl GlobalTimer {
pub fn cancel(&mut self) {
if let Some(tx) = self.tx.take() {
tx.send(()).ok();
}
}
pub fn new_timeout(&mut self, deadline: Instant) {
if self.tx.is_some() {
self.cancel();
}
assert!(self.tx.is_none());
self.future.take();
let (tx, rx) = oneshot::channel();
self.tx = Some(tx);
let delay = tokio::time::sleep_until(deadline.into()).boxed_local();
let rx = rx
.map_err(|err| panic!("Unexpected error in receiving channel {:?}", err));
let fut = futures::future::select(delay, rx)
.then(|_| futures::future::ok(()))
.boxed_local();
self.future = Some(fut);
}
}
pub fn op_global_timer_stop(
state: &mut OpState,
_: (),
_: (),
) -> Result<(), AnyError> {
let global_timer = state.borrow_mut::<GlobalTimer>();
global_timer.cancel();
Ok(())
}
pub fn op_global_timer_start(
state: &mut OpState,
timeout: u64,
_: (),
) -> Result<(), AnyError> {
let timeout = std::cmp::max(timeout, 4);
let deadline = Instant::now() + Duration::from_millis(timeout);
let global_timer = state.borrow_mut::<GlobalTimer>();
global_timer.new_timeout(deadline);
Ok(())
}
pub async fn op_global_timer(
state: Rc<RefCell<OpState>>,
_: (),
_: (),
) -> Result<(), AnyError> {
let maybe_timer_fut = {
let mut s = state.borrow_mut();
let global_timer = s.borrow_mut::<GlobalTimer>();
global_timer.future.take()
};
if let Some(timer_fut) = maybe_timer_fut {
let _ = timer_fut.await;
}
Ok(())
}
pub fn op_now<TP>(
state: &mut OpState,
_argument: (),
_: (),
) -> Result<f64, AnyError>
where
TP: TimersPermission + 'static,
{
let start_time = state.borrow::<StartTime>();
let seconds = start_time.elapsed().as_secs();
let mut subsec_nanos = start_time.elapsed().subsec_nanos() as f64;
let reduced_time_precision = 2_000_000.0;
if !state.borrow_mut::<TP>().allow_hrtime() {
subsec_nanos -= subsec_nanos % reduced_time_precision;
}
let result = (seconds * 1_000) as f64 + (subsec_nanos / 1_000_000.0);
Ok(result)
}
pub fn op_sleep_sync<TP>(
state: &mut OpState,
millis: u64,
_: (),
) -> Result<(), AnyError>
where
TP: TimersPermission + 'static,
{
state.borrow::<TP>().check_unstable(state, "Deno.sleepSync");
sleep(Duration::from_millis(millis));
Ok(())
}