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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.
use std::fs::{remove_file, File};
use std::io::{prelude::*, BufReader, BufWriter};
use std::path::PathBuf;
use serde::{Deserialize, Serialize};
use sys_util::info;
use crate::error::{Error, Result};
/// `Datastore`, which stores and reads calibration values in yaml format.
#[derive(Debug, Deserialize, Serialize, Copy, Clone)]
pub enum Datastore {
/// Indicates using values in VPD.
UseVPD,
DSM {
rdc: i32,
temp: i32,
},
}
impl Datastore {
/// The dir of datastore.
pub const DATASTORE_DIR: &'static str = "/var/lib/sound_card_init";
/// Creates a `Datastore` and initializes its fields from the datastore file.
pub fn from_file(snd_card: &str, channel: usize) -> Result<Datastore> {
let path = Self::path(snd_card, channel);
let reader =
BufReader::new(File::open(&path).map_err(|e| Error::FileIOFailed(path.to_owned(), e))?);
let datastore: Datastore =
serde_yaml::from_reader(reader).map_err(|e| Error::SerdeError(path.to_owned(), e))?;
Ok(datastore)
}
/// Saves a `Datastore` to file.
pub fn save(&self, snd_card: &str, channel: usize) -> Result<()> {
let path = Self::path(snd_card, channel);
let mut writer = BufWriter::new(
File::create(&path).map_err(|e| Error::FileIOFailed(path.to_owned(), e))?,
);
writer
.write(
serde_yaml::to_string(self)
.map_err(|e| Error::SerdeError(path.to_owned(), e))?
.as_bytes(),
)
.map_err(|e| Error::FileIOFailed(path.to_owned(), e))?;
writer
.flush()
.map_err(|e| Error::FileIOFailed(path.to_owned(), e))?;
info!("update Datastore {}: {:?}", path.to_string_lossy(), self);
Ok(())
}
/// Deletes the datastore file.
pub fn delete(snd_card: &str, channel: usize) -> Result<()> {
let path = Self::path(snd_card, channel);
remove_file(&path).map_err(|e| Error::FileIOFailed(path.to_owned(), e))?;
info!("datastore: {:#?} is deleted.", path);
Ok(())
}
fn path(snd_card: &str, channel: usize) -> PathBuf {
PathBuf::from(Self::DATASTORE_DIR)
.join(snd_card)
.join(format!("calib_{}", channel))
}
}
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