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use std::fs::File;
use std::io::{Read, Write};
use std::path::PathBuf;
use error::*;
use error::ErrorKind::*;
use {ControllIdentifier, ControllerInternal, Controllers, Resources, Subsystem};
#[derive(Debug, Clone)]
pub struct CpuAcctController {
base: PathBuf,
path: PathBuf,
}
pub struct CpuAcct {
pub stat: String,
pub usage: u64,
pub usage_all: String,
pub usage_percpu: String,
pub usage_percpu_sys: String,
pub usage_percpu_user: String,
pub usage_sys: u64,
pub usage_user: u64,
}
impl ControllerInternal for CpuAcctController {
fn control_type(&self) -> Controllers {
Controllers::CpuAcct
}
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 CpuAcctController {
fn controller_type() -> Controllers {
Controllers::CpuAcct
}
}
impl<'a> From<&'a Subsystem> for &'a CpuAcctController {
fn from(sub: &'a Subsystem) -> &'a CpuAcctController {
unsafe {
match sub {
Subsystem::CpuAcct(c) => c,
_ => {
assert_eq!(1, 0);
::std::mem::uninitialized()
}
}
}
}
}
fn read_u64_from(mut file: File) -> Result<u64> {
let mut string = String::new();
let res = file.read_to_string(&mut string);
match res {
Ok(_) => match string.trim().parse() {
Ok(e) => Ok(e),
Err(e) => Err(Error::with_cause(ParseError, e)),
},
Err(e) => Err(Error::with_cause(ReadFailed, e)),
}
}
fn read_string_from(mut file: File) -> Result<String> {
let mut string = String::new();
match file.read_to_string(&mut string) {
Ok(_) => Ok(string.trim().to_string()),
Err(e) => Err(Error::with_cause(ReadFailed, e)),
}
}
impl CpuAcctController {
pub fn new(oroot: PathBuf) -> Self {
let mut root = oroot;
root.push(Self::controller_type().to_string());
Self {
base: root.clone(),
path: root,
}
}
pub fn cpuacct(&self) -> CpuAcct {
CpuAcct {
stat: self
.open_path("cpuacct.stat", false)
.and_then(|file| read_string_from(file))
.unwrap_or("".to_string()),
usage: self
.open_path("cpuacct.usage", false)
.and_then(|file| read_u64_from(file))
.unwrap_or(0),
usage_all: self
.open_path("cpuacct.usage_all", false)
.and_then(|file| read_string_from(file))
.unwrap_or("".to_string()),
usage_percpu: self
.open_path("cpuacct.usage_percpu", false)
.and_then(|file| read_string_from(file))
.unwrap_or("".to_string()),
usage_percpu_sys: self
.open_path("cpuacct.usage_percpu_sys", false)
.and_then(|file| read_string_from(file))
.unwrap_or("".to_string()),
usage_percpu_user: self
.open_path("cpuacct.usage_percpu_user", false)
.and_then(|file| read_string_from(file))
.unwrap_or("".to_string()),
usage_sys: self
.open_path("cpuacct.usage_sys", false)
.and_then(|file| read_u64_from(file))
.unwrap_or(0),
usage_user: self
.open_path("cpuacct.usage_user", false)
.and_then(|file| read_u64_from(file))
.unwrap_or(0),
}
}
pub fn reset(&self) -> Result<()> {
self.open_path("cpuacct.usage", true)
.and_then(|mut file| file.write_all(b"0").map_err(|e| Error::with_cause(WriteFailed, e)))
}
}