settings_common/
clock.rs

1// Copyright 2019 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
5const TIMESTAMP_DIVIDEND: i64 = 1_000_000_000;
6
7#[cfg(not(test))]
8pub fn now() -> zx::MonotonicInstant {
9    zx::MonotonicInstant::get()
10}
11
12#[cfg(not(test))]
13pub fn inspect_format_now() -> String {
14    // follows syslog timestamp format: [seconds.nanos]
15    let timestamp = now().into_nanos();
16    let seconds = timestamp / TIMESTAMP_DIVIDEND;
17    let nanos = timestamp % TIMESTAMP_DIVIDEND;
18    format!("{seconds}.{nanos:09}")
19}
20
21#[cfg(test)]
22pub(crate) use mock::inspect_format_now;
23
24// Exported so other crates can use for testing.
25pub mod mock {
26    use super::*;
27    use std::cell::RefCell;
28
29    thread_local!(static MOCK_TIME: RefCell<zx::MonotonicInstant> = RefCell::new(zx::MonotonicInstant::get()));
30
31    pub fn now() -> zx::MonotonicInstant {
32        MOCK_TIME.with(|time| *time.borrow())
33    }
34
35    pub fn set(new_time: zx::MonotonicInstant) {
36        MOCK_TIME.with(|time| *time.borrow_mut() = new_time);
37    }
38
39    pub fn inspect_format_now() -> String {
40        let timestamp = now().into_nanos();
41        let seconds = timestamp / TIMESTAMP_DIVIDEND;
42        let nanos = timestamp % TIMESTAMP_DIVIDEND;
43        format!("{seconds}.{nanos:09}")
44    }
45}
46
47#[cfg(test)]
48mod tests {
49    use super::*;
50
51    #[fuchsia::test]
52    fn test_inspect_format() {
53        mock::set(zx::MonotonicInstant::from_nanos(0));
54        assert_eq!(String::from("0.000000000"), inspect_format_now());
55
56        mock::set(zx::MonotonicInstant::from_nanos(123));
57        assert_eq!(String::from("0.000000123"), inspect_format_now());
58
59        mock::set(zx::MonotonicInstant::from_nanos(123_000_000_000));
60        assert_eq!(String::from("123.000000000"), inspect_format_now());
61
62        mock::set(zx::MonotonicInstant::from_nanos(123_000_000_123));
63        assert_eq!(String::from("123.000000123"), inspect_format_now());
64
65        mock::set(zx::MonotonicInstant::from_nanos(123_001_230_000));
66        assert_eq!(String::from("123.001230000"), inspect_format_now());
67    }
68}
settings_common/clock.rs

settings_common/
clock.rs
