prcs 0.2.0

The Swiss Army knife for running processes
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56

mod utils;

use std::io::Read;
use std::process::{Command, Stdio};
use std::thread::sleep;
use std::time::Duration;
use utils::shell_command;

const SLEEP_DURATION: Duration = Duration::from_millis(10);
const SLEEP_ATTEMPS: u32 = 100;

#[test]
fn does_not_stall_if_status_does_not_match() {
    let mut child = Command::new(env!("CARGO_BIN_EXE_prcs"))
        .arg("-s=>=100")
        .args(&shell_command("exit 42"))
        .spawn()
        .unwrap();

    for _ in 0..SLEEP_ATTEMPS {
        if child.try_wait().unwrap().is_some() {
            return;
        }
        sleep(SLEEP_DURATION);
    }
    panic!(
        "prcs did not exit in more than {:?}.",
        SLEEP_ATTEMPS * SLEEP_DURATION
    )
}

#[test]
fn stalls_if_status_matches() {
    let mut child = Command::new(env!("CARGO_BIN_EXE_prcs"))
        .arg("-s=>=100")
        .args(&shell_command("echo text && exit 123"))
        .stdout(Stdio::piped())
        .spawn()
        .unwrap();
    let mut child_stdout = child.stdout.take().unwrap();

    let mut output = [0; 4];
    for _ in 0..SLEEP_ATTEMPS {
        child_stdout.read(&mut output).unwrap();
        if &output == b"text" {
            sleep(SLEEP_DURATION);
            assert!(child.try_wait().unwrap().is_none());
            return;
        }
        sleep(SLEEP_DURATION);
    }
    panic!(
        "Did not observe child command exit in more than {:?}.",
        SLEEP_ATTEMPS * SLEEP_DURATION
    )
}