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https://github.com/denoland/deno.git
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78 lines
2.2 KiB
Rust
78 lines
2.2 KiB
Rust
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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use super::dispatch_json::{Deserialize, JsonOp, Value};
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use crate::op_error::OpError;
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use crate::state::State;
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use deno_core::CoreIsolate;
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use deno_core::ZeroCopyBuf;
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use futures::future::FutureExt;
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use std::time::Duration;
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use std::time::Instant;
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pub fn init(i: &mut CoreIsolate, s: &State) {
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i.register_op(
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"op_global_timer_stop",
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s.stateful_json_op(op_global_timer_stop),
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);
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i.register_op("op_global_timer", s.stateful_json_op(op_global_timer));
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i.register_op("op_now", s.stateful_json_op(op_now));
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}
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fn op_global_timer_stop(
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state: &State,
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_args: Value,
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_zero_copy: &mut [ZeroCopyBuf],
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) -> Result<JsonOp, OpError> {
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let mut state = state.borrow_mut();
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state.global_timer.cancel();
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Ok(JsonOp::Sync(json!({})))
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}
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#[derive(Deserialize)]
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struct GlobalTimerArgs {
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timeout: u64,
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}
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fn op_global_timer(
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state: &State,
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args: Value,
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_zero_copy: &mut [ZeroCopyBuf],
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) -> Result<JsonOp, OpError> {
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let args: GlobalTimerArgs = serde_json::from_value(args)?;
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let val = args.timeout;
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let mut state = state.borrow_mut();
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let deadline = Instant::now() + Duration::from_millis(val);
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let f = state
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.global_timer
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.new_timeout(deadline)
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.then(move |_| futures::future::ok(json!({})));
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Ok(JsonOp::Async(f.boxed_local()))
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}
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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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fn op_now(
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state: &State,
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_args: Value,
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_zero_copy: &mut [ZeroCopyBuf],
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) -> Result<JsonOp, OpError> {
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let state = state.borrow();
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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.allow_hrtime.is_allow() {
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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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