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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
use super::dispatch_flatbuffers::serialize_response;
use super::utils::*;
use crate::msg;
use crate::state::ThreadSafeState;
use deno::*;
use flatbuffers::FlatBufferBuilder;
// 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,
base: &msg::Base<'_>,
data: Option<PinnedBuf>,
) -> CliOpResult {
assert!(data.is_none());
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
}
let builder = &mut FlatBufferBuilder::new();
let inner = msg::NowRes::create(
builder,
&msg::NowResArgs {
seconds,
subsec_nanos,
},
);
ok_buf(serialize_response(
base.cmd_id(),
builder,
msg::BaseArgs {
inner: Some(inner.as_union_value()),
inner_type: msg::Any::NowRes,
..Default::default()
},
))
}
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