package syslogclient

import (
    "os";
    "fmt";
    "net";
    "strings";
)

const (
    KERN      = 0;
    USER      = 1;
    MAIL      = 2;
    DAEMON    = 3;
    AUTH      = 4;
    SYSLOG    = 5;
    LPR       = 6;
    NEWS      = 7;
    UUCP      = 8;
    CRON      = 9;
    AUTHPRIV  = 10;
    FTP       = 11;
    LOCAL0    = 16;
    LOCAL1    = 17;
    LOCAL2    = 18;
    LOCAL3    = 19;
    LOCAL4    = 20;
    LOCAL5    = 21;
    LOCAL6    = 22;
    LOCAL7    = 23;
)

const (
    EMERGENCY = 0;
    ALERT     = 1;
    CRITICAL  = 2;
    ERROR     = 3;
    WARNING   = 4;
    NOTICE    = 5;
    INFO      = 6;
    DEBUG     = 7;
)

/*
 * Send syslog UDP packet to given host and port.
 */
func Log(message string, level byte, facility byte, host string, port int16) (err os.Error) {
    var addr *net.UDPAddr;
    var conn *net.UDPConn;

    data := fmt.Sprintf("<%d>%s", level + facility * 8, message);
    buf  := strings.Bytes(data);

    if addr, err = net.ResolveUDPAddr(host); err != nil {
        return;
    }

    if conn, err = net.DialUDP("udp", nil, addr); err != nil {
        return;
    }

    if err = conn.SetWriteTimeout(5 * 1000000000); err != nil {
        return;
    }

    if _, err = conn.Write(buf); err != nil {
        return;
    }

    err = conn.Close();

    return;
}