flexi_logger 0.31.9

An easy-to-configure and flexible logger that writes logs to stderr or stdout and/or to files. It allows custom logline formats, and it allows changing the log specification at runtime. It also allows defining additional log streams, e.g. for alert or security messages.
Documentation 
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/// Syslog severity.
///
/// See [RFC 5424](https://datatracker.ietf.org/doc/rfc5424).
#[derive(Debug, Copy, Clone)]
#[allow(clippy::module_name_repetitions)]
pub enum SyslogSeverity {
    /// System is unusable.
    Emergency = 0,
    /// Action must be taken immediately.
    Alert = 1,
    /// Critical conditions.
    Critical = 2,
    /// Error conditions.
    Error = 3,
    /// Warning conditions
    Warning = 4,
    /// Normal but significant condition
    Notice = 5,
    /// Informational messages.
    Info = 6,
    /// Debug-level messages.
    Debug = 7,
}

/// Signature for a custom mapping function that maps the rust log levels to
/// values of the syslog Severity.
#[allow(clippy::module_name_repetitions)]
pub type LevelToSyslogSeverity = fn(level: log::Level) -> SyslogSeverity;

pub(crate) fn default_mapping(level: log::Level) -> SyslogSeverity {
    match level {
        log::Level::Error => SyslogSeverity::Error,
        log::Level::Warn => SyslogSeverity::Warning,
        log::Level::Info => SyslogSeverity::Info,
        log::Level::Debug | log::Level::Trace => SyslogSeverity::Debug,
    }
}

#[cfg(unix)]
impl SyslogSeverity {
    pub(crate) fn to_nix(self) -> nix::syslog::Severity {
        match self {
            SyslogSeverity::Emergency => nix::syslog::Severity::LOG_EMERG,
            SyslogSeverity::Alert => nix::syslog::Severity::LOG_ALERT,
            SyslogSeverity::Critical => nix::syslog::Severity::LOG_CRIT,
            SyslogSeverity::Error => nix::syslog::Severity::LOG_ERR,
            SyslogSeverity::Warning => nix::syslog::Severity::LOG_WARNING,
            SyslogSeverity::Notice => nix::syslog::Severity::LOG_NOTICE,
            SyslogSeverity::Info => nix::syslog::Severity::LOG_INFO,
            SyslogSeverity::Debug => nix::syslog::Severity::LOG_DEBUG,
        }
    }
}