82 lines
2.9 KiB
Rust
82 lines
2.9 KiB
Rust
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// This file is part of Moonfire NVR, a security camera digital video recorder.
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// Copyright (C) 2016 Scott Lamb <slamb@slamb.org>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// In addition, as a special exception, the copyright holders give
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// permission to link the code of portions of this program with the
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// OpenSSL library under certain conditions as described in each
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// individual source file, and distribute linked combinations including
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// the two.
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//
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// You must obey the GNU General Public License in all respects for all
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// of the code used other than OpenSSL. If you modify file(s) with this
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// exception, you may extend this exception to your version of the
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// file(s), but you are not obligated to do so. If you do not wish to do
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// so, delete this exception statement from your version. If you delete
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// this exception statement from all source files in the program, then
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// also delete it here.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//! Clock interface and implementations for testability.
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#[cfg(test)] use std::sync::Mutex;
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use std::thread;
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use time;
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/// Abstract interface to the system clock. This is for testability.
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pub trait Clock : Sync {
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/// Gets the current time.
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fn get_time(&self) -> time::Timespec;
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/// Causes the current thread to sleep for the specified time.
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fn sleep(&self, how_long: time::Duration);
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}
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/// Singleton "real" clock.
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pub static REAL: RealClock = RealClock {};
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/// Real clock; see static `REAL` instance.
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pub struct RealClock {}
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impl Clock for RealClock {
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fn get_time(&self) -> time::Timespec { time::get_time() }
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fn sleep(&self, how_long: time::Duration) {
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match how_long.to_std() {
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Ok(d) => thread::sleep(d),
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Err(e) => warn!("Invalid duration {:?}: {}", how_long, e),
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};
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}
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}
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/// Simulated clock for testing.
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#[cfg(test)]
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pub struct SimulatedClock(Mutex<time::Timespec>);
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#[cfg(test)]
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impl SimulatedClock {
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pub fn new() -> SimulatedClock { SimulatedClock(Mutex::new(time::Timespec::new(0, 0))) }
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}
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#[cfg(test)]
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impl Clock for SimulatedClock {
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fn get_time(&self) -> time::Timespec { *self.0.lock().unwrap() }
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/// Advances the clock by the specified amount without actually sleeping.
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fn sleep(&self, how_long: time::Duration) {
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let mut l = self.0.lock().unwrap();
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*l = *l + how_long;
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}
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}
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