bookdata/util/
process.rs

1use std::env::var;
2use std::mem::MaybeUninit;
3use std::process::exit;
4use std::thread::{sleep, spawn};
5
6use anyhow::Result;
7use chrono::Duration;
8use friendly::{bytes, duration};
9#[cfg(unix)]
10use libc;
11use log::*;
12
13/// Register an early-exit handler for debugging.
14pub fn maybe_exit_early() -> Result<()> {
15    if let Ok(v) = var("BOOKDATA_EXIT_EARLY") {
16        let seconds: u64 = v.parse()?;
17        info!("scheduling shutdown after {} seconds", seconds);
18        spawn(move || {
19            let time = std::time::Duration::from_secs(seconds);
20            sleep(time);
21            info!("timeout reached, exiting");
22            exit(17);
23        });
24    }
25    Ok(())
26}
27
28fn timeval_duration(tv: &libc::timeval) -> Duration {
29    let ds = Duration::seconds(tv.tv_sec);
30    let dus = Duration::microseconds(tv.tv_usec.into());
31    ds + dus
32}
33
34#[cfg(unix)]
35fn log_rusage() {
36    let mut usage = MaybeUninit::uninit();
37    let rc = unsafe { libc::getrusage(libc::RUSAGE_SELF, usage.as_mut_ptr()) };
38    if rc != 0 {
39        error!("getrusage failed with code {}", rc);
40        return;
41    }
42
43    let usage = unsafe { usage.assume_init() };
44    let user = timeval_duration(&usage.ru_utime);
45    let system = timeval_duration(&usage.ru_stime);
46    info!(
47        "process time: {} user, {} system",
48        duration(user),
49        duration(system)
50    );
51
52    let mem = usage.ru_maxrss;
53    info!("max RSS (memory use): {}", bytes(mem));
54}
55
56/// Print closing process statistics.
57pub fn log_process_stats() {
58    #[cfg(unix)]
59    log_rusage();
60}
bookdata/util/process.rs

bookdata/util/
process.rs
