sl4f_lib/time/
facade.rs

1// Copyright 2020 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5use anyhow::Error;
6use std::time::SystemTime;
7use zx::{self as zx, AsHandleRef};
8
9const NANOS_IN_MILLIS: u64 = 1000000;
10
11/// Facade providing access to system time.
12#[derive(Debug)]
13pub struct TimeFacade {}
14
15impl TimeFacade {
16    pub fn new() -> Self {
17        TimeFacade {}
18    }
19
20    /// Returns the system's reported UTC time in millis since the Unix epoch retrieved
21    /// through standard language libraries.
22    pub fn system_time_millis() -> Result<u64, Error> {
23        let time_millis = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?.as_millis();
24        // Zircon stores time as 64 bits so truncating from u128 should not fail.
25        Ok(time_millis.try_into()?)
26    }
27
28    /// Returns the system's reported UTC time in millis since the Unix epoch, retrieved by
29    /// explicitly using the clock handle provided to the runtime.
30    pub fn userspace_time_millis() -> Result<u64, Error> {
31        let clock = fuchsia_runtime::duplicate_utc_clock_handle(zx::Rights::READ)?;
32        Ok(clock.read()?.into_nanos() as u64 / NANOS_IN_MILLIS)
33    }
34
35    /// Returns true iff system time has been synchronized with some source.
36    pub async fn is_synchronized() -> Result<bool, Error> {
37        let clock = fuchsia_runtime::duplicate_utc_clock_handle(zx::Rights::WAIT)?;
38        match clock.wait_handle(zx::Signals::CLOCK_STARTED, zx::MonotonicInstant::ZERO) {
39            Ok(_) => Ok(true),
40            Err(zx::Status::TIMED_OUT) => Ok(false),
41            Err(e) => Err(e.into()),
42        }
43    }
44}
sl4f_lib/time/facade.rs

sl4f_lib/time/
facade.rs
