0
0
Fork 0
mirror of https://github.com/denoland/deno.git synced 2024-10-30 09:08:00 -04:00
denoland-deno/cli/ops/timers.rs
2020-08-28 17:08:24 +02:00

88 lines
2.4 KiB
Rust

// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use super::dispatch_json::{Deserialize, Value};
use crate::state::State;
use deno_core::BufVec;
use deno_core::CoreIsolate;
use deno_core::ErrBox;
use deno_core::ResourceTable;
use deno_core::ZeroCopyBuf;
use futures::future::FutureExt;
use std::cell::RefCell;
use std::rc::Rc;
use std::time::Duration;
use std::time::Instant;
pub fn init(i: &mut CoreIsolate, s: &Rc<State>) {
let t = &CoreIsolate::state(i).borrow().resource_table.clone();
i.register_op(
"op_global_timer_stop",
s.stateful_json_op_sync(t, op_global_timer_stop),
);
i.register_op(
"op_global_timer",
s.stateful_json_op_async(t, op_global_timer),
);
i.register_op("op_now", s.stateful_json_op_sync(t, op_now));
}
fn op_global_timer_stop(
state: &State,
_resource_table: &mut ResourceTable,
_args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, ErrBox> {
state.global_timer.borrow_mut().cancel();
Ok(json!({}))
}
#[derive(Deserialize)]
struct GlobalTimerArgs {
timeout: u64,
}
async fn op_global_timer(
state: Rc<State>,
_resource_table: Rc<RefCell<ResourceTable>>,
args: Value,
_zero_copy: BufVec,
) -> Result<Value, ErrBox> {
let args: GlobalTimerArgs = serde_json::from_value(args)?;
let val = args.timeout;
let deadline = Instant::now() + Duration::from_millis(val);
let timer_fut = state
.global_timer
.borrow_mut()
.new_timeout(deadline)
.boxed_local();
let _ = timer_fut.await;
Ok(json!({}))
}
// Returns a milliseconds and nanoseconds subsec
// since the start time of the deno runtime.
// If the High precision flag is not set, the
// nanoseconds are rounded on 2ms.
fn op_now(
state: &State,
_resource_table: &mut ResourceTable,
_args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, ErrBox> {
let seconds = state.start_time.elapsed().as_secs();
let mut subsec_nanos = state.start_time.elapsed().subsec_nanos();
let reduced_time_precision = 2_000_000; // 2ms in nanoseconds
// If the permission is not enabled
// Round the nano result on 2 milliseconds
// see: https://developer.mozilla.org/en-US/docs/Web/API/DOMHighResTimeStamp#Reduced_time_precision
if state.check_hrtime().is_err() {
subsec_nanos -= subsec_nanos % reduced_time_precision;
}
Ok(json!({
"seconds": seconds,
"subsecNanos": subsec_nanos,
}))
}