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use crate::{expect, ProcResult};
use std::io::Read;
use std::str::FromStr;
use std::time::Duration;
/// The uptime of the system, based on the `/proc/uptime` file.
#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct Uptime {
/// The uptime of the system (including time spent in suspend).
pub uptime: f64,
/// The sum of how much time each core has spent idle.
pub idle: f64,
}
impl super::FromRead for Uptime {
fn from_read<R: Read>(mut r: R) -> ProcResult<Self> {
let mut buf = Vec::with_capacity(128);
r.read_to_end(&mut buf)?;
let line = String::from_utf8_lossy(&buf);
let buf = line.trim();
let mut s = buf.split(' ');
let uptime = expect!(f64::from_str(expect!(s.next())));
let idle = expect!(f64::from_str(expect!(s.next())));
Ok(Uptime { uptime, idle })
}
}
impl Uptime {
/// The uptime of the system (including time spent in suspend).
pub fn uptime_duration(&self) -> Duration {
let secs = self.uptime.trunc() as u64;
let csecs = (self.uptime.fract() * 100.0).round() as u32;
let nsecs = csecs * 10_000_000;
Duration::new(secs, nsecs)
}
/// The sum of how much time each core has spent idle.
pub fn idle_duration(&self) -> Duration {
let secs = self.idle.trunc() as u64;
let csecs = (self.idle.fract() * 100.0).round() as u32;
let nsecs = csecs * 10_000_000;
Duration::new(secs, nsecs)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::FromRead;
use std::io::Cursor;
#[test]
fn test_uptime() {
let reader = Cursor::new(b"2578790.61 1999230.98\n");
let uptime = Uptime::from_read(reader).unwrap();
assert_eq!(uptime.uptime_duration(), Duration::new(2578790, 610_000_000));
assert_eq!(uptime.idle_duration(), Duration::new(1999230, 980_000_000));
}
}