procsys 0.7.0

Rust library to retrieve system, kernel, and process metrics from the pseudo-filesystems /proc and /sys
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
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155

use std::{
    fs::{self, File},
    io::{BufRead, BufReader},
    path::{Path, PathBuf},
};

use walkdir::WalkDir;

use crate::error::{CollectResult, MetricError};

pub fn collect_info_string(filename: &str, dir_path: &Path) -> CollectResult<Option<String>> {
    if filename.is_empty() {
        return Ok(None);
    }

    let info_path = Path::new(dir_path).join(filename);

    if !info_path.exists() {
        return Ok(None);
    }

    match fs::read_to_string(info_path.as_path()) {
        Ok(c) => {
            let value = c.trim().to_string();
            if value.is_empty() {
                return Ok(None);
            }

            Ok(Some(c.trim().to_string()))
        }
        Err(err) => Err(MetricError::IOError(info_path, err)),
    }
}

pub fn collect_info_i64(filename: &str, dir_path: &Path) -> CollectResult<Option<i64>> {
    if let Some(c) = collect_info_string(filename, dir_path)? {
        if !c.is_empty() {
            match c.parse::<i64>() {
                Ok(i) => return Ok(Some(i)),
                Err(err) => return Err(MetricError::ParseIntError(filename.to_string(), err)),
            }
        }
    }

    Ok(None)
}

pub fn collect_info_u64(filename: &str, dir_path: &Path) -> CollectResult<Option<u64>> {
    if let Some(c) = collect_info_string(filename, dir_path)? {
        if !c.is_empty() {
            match c.parse::<u64>() {
                Ok(i) => return Ok(Some(i)),
                Err(err) => return Err(MetricError::ParseIntError(filename.to_string(), err)),
            }
        }
    }

    Ok(None)
}

pub fn list_dir_content(
    dir_path: &Path,
    include_pattern: &str,
    exclude_pattern: &str,
) -> Vec<String> {
    let mut content = Vec::new();

    for dir_item in WalkDir::new(dir_path)
        .max_depth(1)
        .into_iter()
        .filter_map(|e| e.ok())
    {
        if dir_item.file_name() == exclude_pattern {
            continue;
        }

        let dir_item_name = dir_item.file_name().to_str().unwrap_or_default();

        if include_pattern.is_empty() {
            content.push(dir_item_name.to_string());

            continue;
        }

        if dir_item_name.starts_with(include_pattern) {
            content.push(dir_item_name.to_string());
        }
    }

    content
}

pub fn read_file_lines(filename: &str) -> CollectResult<Vec<String>> {
    let mut result = Vec::new();

    match File::open(filename) {
        Ok(file) => {
            let reader = BufReader::new(file);
            for line_result in reader.lines() {
                match line_result {
                    Ok(line) => result.push(line),
                    Err(err) => return Err(MetricError::IOError(PathBuf::from(filename), err)),
                }
            }
        }
        Err(err) => return Err(MetricError::IOError(PathBuf::from(filename), err)),
    }

    Ok(result)
}

pub fn convert_to_bytes(num: u64, unit: &str) -> CollectResult<Option<u64>> {
    match unit {
        "B" => Ok(Some(num)),
        "KiB" | "kiB" | "kB" | "KB" => Ok(Some(num * 1024)),
        "MiB" | "miB" | "MB" | "mB" => Ok(Some(num * 1024 * 1024)),
        "GiB" | "giB" | "GB" | "gB" => Ok(Some(num * 1024 * 1024 * 1024)),
        _ => Err(MetricError::ByteConvertError(unit.to_string())),
    }
}

pub fn convert_str_to_i64(value: &str) -> CollectResult<i64> {
    match value.parse::<i64>() {
        Ok(c) => Ok(c),
        Err(err) => Err(MetricError::ParseIntError(value.to_string(), err)),
    }
}

pub fn convert_str_to_u64(value: &str) -> CollectResult<u64> {
    match value.parse::<u64>() {
        Ok(c) => Ok(c),
        Err(err) => Err(MetricError::ParseIntError(value.to_string(), err)),
    }
}

pub fn convert_hex_to_u64(value: &str) -> CollectResult<u64> {
    match u64::from_str_radix(value.strip_prefix("0x").unwrap_or_default(), 16) {
        Ok(v) => Ok(v),
        Err(err) => Err(MetricError::ParseIntError(value.to_string(), err)),
    }
}

pub fn convert_hex_to_i32(value: &str) -> CollectResult<i32> {
    match i32::from_str_radix(value.strip_prefix("0x").unwrap_or_default(), 16) {
        Ok(v) => Ok(v),
        Err(err) => Err(MetricError::ParseIntError(value.to_string(), err)),
    }
}

pub fn convert_str_to_isize(value: &str) -> CollectResult<isize> {
    match value.parse::<isize>() {
        Ok(c) => Ok(c),
        Err(err) => Err(MetricError::ParseIntError(value.to_string(), err)),
    }
}