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// Copyright 2020 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//! It contains common utils shared within sound_card_init.
#![deny(missing_docs)]
use std::fs::File;
use std::io::{prelude::*, BufReader, BufWriter};
use std::path::PathBuf;
use std::time::Duration;
use crate::datastore::Datastore;
use crate::error::{Error, Result};
fn duration_from_file(path: &PathBuf) -> Result<Duration> {
let reader =
BufReader::new(File::open(&path).map_err(|e| Error::FileIOFailed(path.clone(), e))?);
serde_yaml::from_reader(reader).map_err(|e| Error::SerdeError(path.clone(), e))
}
/// The utils to parse CRAS shutdown time file.
pub mod shutdown_time {
use super::*;
// The path of CRAS shutdown time file.
const SHUTDOWN_TIME_FILE: &str = "/var/lib/cras/stop";
/// Reads the unix time from CRAS shutdown time file.
pub fn from_file() -> Result<Duration> {
duration_from_file(&PathBuf::from(SHUTDOWN_TIME_FILE))
}
}
/// The utils to create and parse sound_card_init run time file.
pub mod run_time {
use std::time::SystemTime;
use super::*;
// The filename of sound_card_init run time file.
const RUN_TIME_FILE: &str = "run";
/// Returns the sound_card_init run time file existence.
pub fn exists(snd_card: &str) -> bool {
run_time_file(snd_card).exists()
}
/// Reads the unix time from sound_card_init run time file.
pub fn from_file(snd_card: &str) -> Result<Duration> {
duration_from_file(&run_time_file(snd_card))
}
/// Saves the current unix time to sound_card_init run time file.
pub fn now_to_file(snd_card: &str) -> Result<()> {
match SystemTime::now().duration_since(SystemTime::UNIX_EPOCH) {
Ok(t) => to_file(snd_card, t),
Err(e) => Err(Error::SystemTimeError(e)),
}
}
/// Saves the unix time to sound_card_init run time file.
pub fn to_file(snd_card: &str, duration: Duration) -> Result<()> {
let path = run_time_file(snd_card);
let mut writer =
BufWriter::new(File::create(&path).map_err(|e| Error::FileIOFailed(path.clone(), e))?);
writer
.write_all(
serde_yaml::to_string(&duration)
.map_err(|e| Error::SerdeError(path.clone(), e))?
.as_bytes(),
)
.map_err(|e| Error::FileIOFailed(path.clone(), e))?;
writer
.flush()
.map_err(|e| Error::FileIOFailed(path.clone(), e))?;
Ok(())
}
fn run_time_file(snd_card: &str) -> PathBuf {
PathBuf::from(Datastore::DATASTORE_DIR)
.join(snd_card)
.join(RUN_TIME_FILE)
}
}
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