only-engine 0.5.1

Execution planning and runtime engine for only tasks.
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

use std::io::Write;
use std::sync::{Mutex, OnceLock};

use crate::EngineError;

static STDOUT: OnceLock<Mutex<anstream::Stdout>> = OnceLock::new();
static STDERR: OnceLock<Mutex<anstream::Stderr>> = OnceLock::new();

pub(super) fn write_stdout(content: &[u8]) -> Result<(), EngineError> {
    let mut writer = STDOUT
        .get_or_init(|| Mutex::new(anstream::stdout()))
        .lock()
        .unwrap_or_else(|poisoned| poisoned.into_inner());
    write_output(content, &mut *writer)
}

pub(super) fn write_stderr(content: &[u8]) -> Result<(), EngineError> {
    let mut writer = STDERR
        .get_or_init(|| Mutex::new(anstream::stderr()))
        .lock()
        .unwrap_or_else(|poisoned| poisoned.into_inner());
    write_output(content, &mut *writer)
}

fn write_output(content: &[u8], mut writer: impl Write) -> Result<(), EngineError> {
    writer
        .write_all(content)
        .and_then(|()| writer.flush())
        .map_err(|error| EngineError::Runtime(format!("failed to write task output: {error}")))
}