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 Facility, according to [RFC 5424](https://datatracker.ietf.org/doc/rfc5424).
///
/// Note that the original integer values are already multiplied by 8.
#[derive(Copy, Clone, Debug)]
#[allow(clippy::module_name_repetitions)]
pub enum SyslogFacility {
    /// kernel messages.
    Kernel = 0 << 3,
    /// user-level messages.
    UserLevel = 1 << 3,
    /// mail system.
    MailSystem = 2 << 3,
    /// system daemons.
    SystemDaemons = 3 << 3,
    /// security/authorization messages.
    Authorization = 4 << 3,
    /// messages generated internally by syslogd.
    SyslogD = 5 << 3,
    /// line printer subsystem.
    LinePrinter = 6 << 3,
    /// network news subsystem.
    News = 7 << 3,
    /// UUCP subsystem.
    Uucp = 8 << 3,
    /// clock daemon.
    Clock = 9 << 3,
    /// security/authorization messages.
    Authorization2 = 10 << 3,
    /// FTP daemon.
    Ftp = 11 << 3,
    /// NTP subsystem.
    Ntp = 12 << 3,
    /// log audit.
    LogAudit = 13 << 3,
    /// log alert.
    LogAlert = 14 << 3,
    /// clock daemon (note 2).
    Clock2 = 15 << 3,
    /// local use 0  (local0).
    LocalUse0 = 16 << 3,
    /// local use 1  (local1).
    LocalUse1 = 17 << 3,
    /// local use 2  (local2).
    LocalUse2 = 18 << 3,
    /// local use 3  (local3).
    LocalUse3 = 19 << 3,
    /// local use 4  (local4).
    LocalUse4 = 20 << 3,
    /// local use 5  (local5).
    LocalUse5 = 21 << 3,
    /// local use 6  (local6).
    LocalUse6 = 22 << 3,
    /// local use 7  (local7).
    LocalUse7 = 23 << 3,
}

#[cfg(unix)]
impl SyslogFacility {
    pub(crate) fn to_nix(self) -> nix::syslog::Facility {
        match self {
            SyslogFacility::Authorization | SyslogFacility::Authorization2 => {
                nix::syslog::Facility::LOG_AUTH
            }
            SyslogFacility::Clock
            | SyslogFacility::Clock2
            | SyslogFacility::Ftp
            | SyslogFacility::Ntp
            | SyslogFacility::SystemDaemons => nix::syslog::Facility::LOG_DAEMON,
            SyslogFacility::Kernel => nix::syslog::Facility::LOG_KERN,
            SyslogFacility::LocalUse0 => nix::syslog::Facility::LOG_LOCAL0,
            SyslogFacility::LocalUse1 => nix::syslog::Facility::LOG_LOCAL1,
            SyslogFacility::LocalUse2 => nix::syslog::Facility::LOG_LOCAL2,
            SyslogFacility::LocalUse3 => nix::syslog::Facility::LOG_LOCAL3,
            SyslogFacility::LocalUse4 => nix::syslog::Facility::LOG_LOCAL4,
            SyslogFacility::LocalUse5 => nix::syslog::Facility::LOG_LOCAL5,
            SyslogFacility::LocalUse6 => nix::syslog::Facility::LOG_LOCAL6,
            SyslogFacility::LocalUse7 => nix::syslog::Facility::LOG_LOCAL7,
            SyslogFacility::LinePrinter => nix::syslog::Facility::LOG_LPR,
            SyslogFacility::MailSystem => nix::syslog::Facility::LOG_MAIL,
            SyslogFacility::News => nix::syslog::Facility::LOG_NEWS,
            SyslogFacility::SyslogD => nix::syslog::Facility::LOG_SYSLOG,
            SyslogFacility::LogAlert | SyslogFacility::LogAudit | SyslogFacility::UserLevel => {
                nix::syslog::Facility::LOG_USER
            }
            SyslogFacility::Uucp => nix::syslog::Facility::LOG_UUCP,
        }
    }
}