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use std::fs;
use std::io::{Error, ErrorKind, Result};
use std::str::FromStr;
use crate::PID;
#[derive(Debug)]
pub struct LoadAverage {
pub one: f32,
pub five: f32,
pub fifteen: f32,
pub runnable: i32,
pub total_runnable: i32,
pub last_pid: PID,
}
pub fn uptime() -> isize {
let data = fs::read_to_string("/proc/uptime").unwrap();
uptime_internal(&data)
}
fn uptime_internal(data: &str) -> isize {
let numbers: Vec<&str> = data.split(' ').collect();
let uptime: Vec<&str> = numbers[0].split('.').collect();
FromStr::from_str(uptime[0]).unwrap()
}
pub fn loadavg() -> Result<LoadAverage> {
let data = fs::read_to_string("/proc/loadavg")?;
loadavg_internal(&data)
}
fn loadavg_internal(data: &str) -> Result<LoadAverage> {
let fields: Vec<&str> = data.split_whitespace().collect();
let one = try_parse!(fields[0]);
let five = try_parse!(fields[1]);
let fifteen = try_parse!(fields[2]);
let last_pid = try_parse!(fields[4]);
let entities = fields[3].split('/').collect::<Vec<&str>>();
let runnable = try_parse!(entities[0]);
let total_runnable = try_parse!(entities[1]);
Ok(LoadAverage {
one,
five,
fifteen,
runnable,
total_runnable,
last_pid,
})
}
#[cfg(test)]
mod unit_tests {
use super::*;
#[test]
fn uptime_parses() {
assert_eq!(uptime_internal("12489513.08 22906637.29\n"), 12_489_513);
}
#[test]
fn loadavg_parses() {
let input = "0.49 0.70 0.84 2/519 1454\n";
let out = loadavg_internal(input).unwrap();
assert_eq!(out.one, 0.49);
assert_eq!(out.five, 0.70);
assert_eq!(out.fifteen, 0.84);
assert_eq!(out.total_runnable, 519);
assert_eq!(out.runnable, 2);
assert_eq!(out.last_pid, 1454);
}
}