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use std::io::{Read, Write};
use std::path::PathBuf;
use crate::error::ErrorKind::*;
use crate::error::*;
use crate::{ControllIdentifier, ControllerInternal, Controllers, Resources, Subsystem};
#[derive(Debug, Clone)]
pub struct FreezerController {
base: PathBuf,
path: PathBuf,
v2: bool,
}
pub enum FreezerState {
Thawed,
Freezing,
Frozen,
}
impl ControllerInternal for FreezerController {
fn control_type(&self) -> Controllers {
Controllers::Freezer
}
fn get_path(&self) -> &PathBuf {
&self.path
}
fn get_path_mut(&mut self) -> &mut PathBuf {
&mut self.path
}
fn get_base(&self) -> &PathBuf {
&self.base
}
fn apply(&self, _res: &Resources) -> Result<()> {
Ok(())
}
}
impl ControllIdentifier for FreezerController {
fn controller_type() -> Controllers {
Controllers::Freezer
}
}
impl<'a> From<&'a Subsystem> for &'a FreezerController {
fn from(sub: &'a Subsystem) -> &'a FreezerController {
unsafe {
match sub {
Subsystem::Freezer(c) => c,
_ => {
assert_eq!(1, 0);
let v = std::mem::MaybeUninit::uninit();
v.assume_init()
}
}
}
}
}
impl FreezerController {
pub fn new(root: PathBuf, v2: bool) -> Self {
Self {
base: root.clone(),
path: root,
v2,
}
}
pub fn freeze(&self) -> Result<()> {
let mut file = "freezer.state";
let mut content = "FROZEN".to_string();
if self.v2 {
file = "cgroup.freeze";
content = "1".to_string();
}
self.open_path(file, true).and_then(|mut file| {
file.write_all(content.as_ref())
.map_err(|e| Error::with_cause(WriteFailed, e))
})
}
pub fn thaw(&self) -> Result<()> {
let mut file = "freezer.state";
let mut content = "THAWED".to_string();
if self.v2 {
file = "cgroup.freeze";
content = "0".to_string();
}
self.open_path(file, true).and_then(|mut file| {
file.write_all(content.as_ref())
.map_err(|e| Error::with_cause(WriteFailed, e))
})
}
pub fn state(&self) -> Result<FreezerState> {
let mut file = "freezer.state";
if self.v2 {
file = "cgroup.freeze";
}
self.open_path(file, false).and_then(|mut file| {
let mut s = String::new();
let res = file.read_to_string(&mut s);
match res {
Ok(_) => match s.as_ref() {
"FROZEN" => Ok(FreezerState::Frozen),
"THAWED" => Ok(FreezerState::Thawed),
"1" => Ok(FreezerState::Frozen),
"0" => Ok(FreezerState::Thawed),
"FREEZING" => Ok(FreezerState::Freezing),
_ => Err(Error::new(ParseError)),
},
Err(e) => Err(Error::with_cause(ReadFailed, e)),
}
})
}
}