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30 lines
1 KiB
Rust
30 lines
1 KiB
Rust
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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use super::dispatch_json::{JsonOp, Value};
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use crate::state::ThreadSafeState;
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use deno::*;
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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(
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state: &ThreadSafeState,
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_args: Value,
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_zero_copy: Option<PinnedBuf>,
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) -> Result<JsonOp, ErrBox> {
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let seconds = state.start_time.elapsed().as_secs();
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let mut subsec_nanos = state.start_time.elapsed().subsec_nanos();
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let reduced_time_precision = 2_000_000; // 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.permissions.allows_hrtime() {
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subsec_nanos -= subsec_nanos % reduced_time_precision
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}
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Ok(JsonOp::Sync(json!({
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"seconds": seconds,
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"subsecNanos": subsec_nanos,
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})))
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}
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