lupp 0.1.3

Commandline tool for colorizing logs
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
57
58
59
60
61
62
63
64
65
66
67
68
69

pub mod json;
pub mod logfmt;

#[derive(PartialEq, Debug)]
pub enum LogFormat {
    Json,
    Logfmt,
    Colored,
    Unknown,
}

pub fn detect(line: &str) -> LogFormat {
    // if the line already contains colors, skip it
    if line.contains('\x1b') {
        return LogFormat::Colored;
    }

    // TODO: be smarter?
    if line.starts_with('{') {
        return LogFormat::Json;
    }

    // detect logfmt by trying to get first key
    // TODO: be smarter?
    let mut found_key = false;
    for ch in line.chars() {
        if ch.is_ascii_alphabetic() {
            found_key = true;
        } else {
            if ch == '=' && found_key {
                return LogFormat::Logfmt;
            }
            return LogFormat::Unknown;
        }
    }

    LogFormat::Unknown
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_detect_format() {
        let tests = [
            (
                r#"field=thing other="hello world" status=200"#,
                LogFormat::Logfmt,
            ),
            (
                r#"{"field": "value", "other": "hello world", "status": 200}"#,
                LogFormat::Json,
            ),
            (
                r#"{"field": "value", "other": "hello world", "status": 200}"#,
                LogFormat::Colored,
            ),
            (
                r#"This is not a strucutured log line, just some text"#,
                LogFormat::Unknown,
            ),
        ];

        for (log_row, expected_format) in tests {
            assert_eq!(detect(log_row), expected_format);
        }
    }
}