1 files changed, 41 insertions, 2 deletions
diff --git a/cli/ops/timers.rs b/cli/ops/timers.rs
index abcd5c1b3..f366797b4 100644
--- a/cli/ops/timers.rs
+++ b/cli/ops/timers.rs
@@ -1,5 +1,6 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 use super::dispatch_json::{Deserialize, JsonOp, Value};
+use crate::ops::json_op;
 use crate::state::ThreadSafeState;
 use deno::*;
 use futures::Future;
@@ -7,7 +8,19 @@ use std;
 use std::time::Duration;
 use std::time::Instant;
 
-pub fn op_global_timer_stop(
+pub fn init(i: &mut Isolate, s: &ThreadSafeState) {
+  i.register_op(
+    "global_timer_stop",
+    s.core_op(json_op(s.stateful_op(op_global_timer_stop))),
+  );
+  i.register_op(
+    "global_timer",
+    s.core_op(json_op(s.stateful_op(op_global_timer))),
+  );
+  i.register_op("now", s.core_op(json_op(s.stateful_op(op_now))));
+}
+
+fn op_global_timer_stop(
   state: &ThreadSafeState,
   _args: Value,
   _zero_copy: Option<PinnedBuf>,
@@ -23,7 +36,7 @@ struct GlobalTimerArgs {
   timeout: u64,
 }
 
-pub fn op_global_timer(
+fn op_global_timer(
   state: &ThreadSafeState,
   args: Value,
   _zero_copy: Option<PinnedBuf>,
@@ -40,3 +53,29 @@ pub fn op_global_timer(
 
   Ok(JsonOp::Async(Box::new(f)))
 }
+
+// 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: &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,
+  })))
+}