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127 lines
3.2 KiB
Rust
127 lines
3.2 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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//! This module helps deno implement timers and performance APIs.
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use deno_core::error::AnyError;
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use deno_core::include_js_files;
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use deno_core::op_async;
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use deno_core::op_sync;
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use deno_core::CancelFuture;
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use deno_core::CancelHandle;
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use deno_core::Extension;
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use deno_core::OpState;
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use deno_core::Resource;
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use deno_core::ResourceId;
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use std::borrow::Cow;
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use std::cell::RefCell;
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use std::rc::Rc;
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use std::time::Duration;
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use std::time::Instant;
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pub trait TimersPermission {
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fn allow_hrtime(&mut self) -> bool;
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fn check_unstable(&self, state: &OpState, api_name: &'static str);
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}
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pub fn init<P: TimersPermission + 'static>() -> Extension {
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Extension::builder()
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.js(include_js_files!(
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prefix "deno:ext/timers",
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"01_timers.js",
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"02_performance.js",
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))
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.ops(vec![
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("op_now", op_sync(op_now::<P>)),
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("op_timer_handle", op_sync(op_timer_handle)),
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("op_sleep", op_async(op_sleep)),
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("op_sleep_sync", op_sync(op_sleep_sync::<P>)),
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])
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.state(|state| {
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state.put(StartTime::now());
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Ok(())
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})
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.build()
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}
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pub type StartTime = Instant;
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// Returns a milliseconds and nanoseconds subsec
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// since the start time of the deno runtime.
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// If the High precision flag is not set, the
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// nanoseconds are rounded on 2ms.
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pub fn op_now<TP>(
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state: &mut OpState,
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_argument: (),
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_: (),
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) -> Result<f64, AnyError>
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where
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TP: TimersPermission + 'static,
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{
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let start_time = state.borrow::<StartTime>();
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let seconds = start_time.elapsed().as_secs();
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let mut subsec_nanos = start_time.elapsed().subsec_nanos() as f64;
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let reduced_time_precision = 2_000_000.0; // 2ms in nanoseconds
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// If the permission is not enabled
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// Round the nano result on 2 milliseconds
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// see: https://developer.mozilla.org/en-US/docs/Web/API/DOMHighResTimeStamp#Reduced_time_precision
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if !state.borrow_mut::<TP>().allow_hrtime() {
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subsec_nanos -= subsec_nanos % reduced_time_precision;
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}
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let result = (seconds * 1_000) as f64 + (subsec_nanos / 1_000_000.0);
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Ok(result)
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}
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pub struct TimerHandle(Rc<CancelHandle>);
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impl Resource for TimerHandle {
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fn name(&self) -> Cow<str> {
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"timer".into()
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}
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fn close(self: Rc<Self>) {
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self.0.cancel();
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}
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}
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/// Creates a [`TimerHandle`] resource that can be used to cancel invocations of
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/// [`op_sleep`].
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pub fn op_timer_handle(
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state: &mut OpState,
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_: (),
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_: (),
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) -> Result<ResourceId, AnyError> {
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let rid = state
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.resource_table
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.add(TimerHandle(CancelHandle::new_rc()));
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Ok(rid)
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}
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/// Waits asynchronously until either `millis` milliseconds have passed or the
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/// [`TimerHandle`] resource given by `rid` has been canceled.
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pub async fn op_sleep(
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state: Rc<RefCell<OpState>>,
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millis: u64,
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rid: ResourceId,
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) -> Result<(), AnyError> {
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let handle = state.borrow().resource_table.get::<TimerHandle>(rid)?;
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tokio::time::sleep(Duration::from_millis(millis))
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.or_cancel(handle.0.clone())
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.await?;
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Ok(())
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}
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pub fn op_sleep_sync<TP>(
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state: &mut OpState,
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millis: u64,
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_: (),
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) -> Result<(), AnyError>
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where
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TP: TimersPermission + 'static,
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{
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state.borrow::<TP>().check_unstable(state, "Deno.sleepSync");
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std::thread::sleep(Duration::from_millis(millis));
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Ok(())
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}
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