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
156
157
158
159
160
161
162

use std::env::VarError;
use std::str::FromStr;

// Default date format: 0000-00-00 00:00:00
#[doc(hidden)]
pub static mut DATE_FORMAT: &str = "%F %T";
#[doc(hidden)]
pub static mut LOG_CONFIG: LogConfig = LogConfig::enable_all();

#[derive(Debug, Clone)]
pub enum LogError {
    NotPresent,
    NotUnicode,
    FormatError(String),
}

#[derive(Debug, Clone, Copy, Default)]
pub struct LogConfig {
    pub trace: bool,
    pub debug: bool,
    pub info: bool,
    pub warn: bool,
    pub error: bool,
}

impl FromStr for LogConfig {
    type Err = String;
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let s = s.to_lowercase();
        let mut config = Self::disable_all();
        for item in s.split(',') {
            match item.trim() {
                "all" => {
                    config = Self::enable_all();
                }
                "!all" => {
                    config = Self::disable_all();
                }
                "trace" => {
                    config.trace = true;
                }
                "!trace" => {
                    config.trace = false;
                }
                "debug" => {
                    config.debug = true;
                }
                "!debug" => {
                    config.debug = false;
                }
                "info" => {
                    config.info = true;
                }
                "!info" => {
                    config.info = false;
                }
                "warn" => {
                    config.warn = true;
                }
                "!warn" => {
                    config.warn = false;
                }
                "error" => {
                    config.error = true;
                }
                "!error" => {
                    config.error = false;
                }
                _ => {
                    return Err(format!("Invalid ENV parameter: {}", item));
                }
            }
        }
        Ok(config)
    }
}

impl LogConfig {
    pub const fn enable_all() -> Self {
        Self {
            trace: true,
            debug: true,
            info: true,
            warn: true,
            error: true,
        }
    }

    pub const fn disable_all() -> Self {
        Self {
            trace: false,
            debug: false,
            info: false,
            warn: false,
            error: false,
        }
    }

    pub fn from_env() -> Result<Self, LogError> {
        match std::env::var("LOG") {
            Ok(s) => match Self::from_str(&s) {
                Ok(c) => Ok(c),
                Err(msg) => Err(LogError::FormatError(msg)),
            },
            Err(err) => match err {
                VarError::NotPresent => Err(LogError::NotPresent),
                VarError::NotUnicode(_) => Err(LogError::NotUnicode),
            },
        }
    }

    pub fn trace(&mut self, enable: bool) -> &mut Self {
        self.trace = enable;
        self
    }

    pub fn debug(&mut self, enable: bool) -> &mut Self {
        self.debug = enable;
        self
    }

    pub fn info(&mut self, enable: bool) -> &mut Self {
        self.info = enable;
        self
    }

    pub fn warn(&mut self, enable: bool) -> &mut Self {
        self.warn = enable;
        self
    }

    pub fn error(&mut self, enable: bool) -> &mut Self {
        self.error = enable;
        self
    }

    // TODO
    /// Change date and time format
    ///
    /// [time docs](https://docs.rs/time/0.2.23/time/?search=#formatting)
    /// ```no-run
    /// config.date_format("%c").unwrap();
    /// [Fri Nov 27 13:51:59 2020] [ERROR] This is a error log
    /// ```
    pub fn date_format<S: AsRef<str>>(&mut self, format: S) -> Result<&mut Self, ()> {
        if time::now().strftime(format.as_ref()).is_ok() {
            unsafe {
                DATE_FORMAT = Box::leak(format.as_ref().to_string().into_boxed_str());
            }
            Ok(self)
        } else {
            Err(())
        }
    }

    /// Make the configuration effective
    pub fn init(self) {
        unsafe {
            LOG_CONFIG = self;
        }
    }
}