use crate::*;
use std::{
io::{Read, Write},
str::FromStr,
};
use sysinfo::{ProcessExt, SystemExt};
pub fn pid_check(config: &LairServerConfig) -> LairResult<()> {
let mut sys = sysinfo::System::new();
let mut last_err = None;
for i in 0..3 {
if i != 0 {
std::thread::sleep(std::time::Duration::from_millis(10));
}
match pid_check_write(config.pid_file.as_path(), &mut sys) {
Ok(_) => {
last_err = None;
break;
}
Err(e) => {
last_err = Some(e);
}
}
}
if let Some(e) = last_err {
return Err(e);
}
Ok(())
}
fn pid_check_write(
pid_file: &std::path::Path,
sys: &mut sysinfo::System,
) -> LairResult<()> {
std::fs::create_dir_all(pid_file.parent().expect("bad pid_file dir"))?;
{
let mut read_pid = std::fs::OpenOptions::new();
read_pid.read(true);
let mut buf = Vec::new();
match read_pid.open(pid_file) {
Ok(mut read_pid) => {
read_pid.read_to_end(&mut buf)?;
let pid =
sysinfo::Pid::from_str(&String::from_utf8_lossy(&buf))
.map_err(one_err::OneErr::new)?;
sys.refresh_process(pid);
match sys.process(pid) {
Some(process)
if process.name() == env!("CARGO_PKG_NAME") =>
{
return Err("ProcessAlreadyExists".into());
}
_ => {
std::fs::remove_file(pid_file)?;
}
}
}
Err(e) if e.kind() == std::io::ErrorKind::NotFound => {
}
Err(e) => return Err(one_err::OneErr::new(e)),
}
}
let mut write_pid = std::fs::OpenOptions::new();
let mut write_pid =
write_pid.write(true).create_new(true).open(pid_file)?;
write_pid
.write_all(format!("{}", sysinfo::get_current_pid()?).as_bytes())?;
Ok(())
}