mirror of
https://github.com/denoland/deno.git
synced 2024-10-29 08:58:01 -04:00
30 lines
1 KiB
Rust
30 lines
1 KiB
Rust
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
|
|
use super::dispatch_json::{JsonOp, Value};
|
|
use crate::state::ThreadSafeState;
|
|
use deno::*;
|
|
|
|
// 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.
|
|
pub fn op_now(
|
|
state: &ThreadSafeState,
|
|
_args: Value,
|
|
_zero_copy: Option<PinnedBuf>,
|
|
) -> Result<JsonOp, 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.permissions.allows_hrtime() {
|
|
subsec_nanos -= subsec_nanos % reduced_time_precision
|
|
}
|
|
|
|
Ok(JsonOp::Sync(json!({
|
|
"seconds": seconds,
|
|
"subsecNanos": subsec_nanos,
|
|
})))
|
|
}
|