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xlog.go
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xlog.go
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package xlog
// Extended logging
import (
"fmt"
"log"
"log/syslog"
"os"
)
type XLog struct {
// Syslog logger
SYSLOG *syslog.Writer
STDOUT *log.Logger
STDERR *log.Logger
DEBUG *bool
LOG_LEVEL syslog.Priority // LOG_EMERG=0 .. LOG_DEBUG=7
}
const (
// https://unix.superglobalmegacorp.com/Net2/newsrc/sys/syslog.h.html
LOG_EMERG = 0 /* system is unusable */
LOG_ALERT = 1 /* action must be taken immediately */
LOG_CRIT = 2 /* critical conditions */
LOG_ERR = 3 /* error conditions */
LOG_WARNING = 4 /* warning conditions */
LOG_NOTICE = 5 /* normal but significant condition */
LOG_INFO = 6 /* informational */
LOG_DEBUG = 7 /* debug-level messages */
)
func New(daemon_name string) (XLog) {
var XLOG XLog
Debug := false
// Initialize logging pathes
XLOG.SYSLOG, _ = syslog.New(syslog.LOG_WARNING | syslog.LOG_DAEMON, daemon_name) // M.b. NULL pointer, in case of some error
XLOG.STDOUT = log.New(os.Stdout, "", log.LstdFlags)
XLOG.STDERR = log.New(os.Stderr, "", log.LstdFlags)
XLOG.DEBUG = &Debug
return XLOG
}
// void: Log to syslog/stdout/stderr, depending on settings
func (xl XLog) Log(severity syslog.Priority, message string) {
if severity > xl.LOG_LEVEL { return }
var err error
level := "debug"
switch severity {
case syslog.LOG_EMERG:
level = "emerg"
case syslog.LOG_ALERT:
level = "alert"
case syslog.LOG_CRIT:
level = "crit"
case syslog.LOG_ERR:
level = "err"
case syslog.LOG_WARNING:
level = "warn"
case syslog.LOG_NOTICE:
level = "notice"
case syslog.LOG_INFO:
level = "info"
}
if (xl.DEBUG != nil && *xl.DEBUG) || (xl.SYSLOG == nil) {
if severity > syslog.LOG_WARNING {
xl.STDERR.Printf("%s: %s", level, message)
} else {
xl.STDOUT.Printf("%s: %s", level, message)
}
} else {
message = level + ": " + message
switch severity { // Double work, due to the absence of "syslog.Log(string, severity)"
case syslog.LOG_EMERG:
err = xl.SYSLOG.Emerg(message)
case syslog.LOG_ALERT:
err = xl.SYSLOG.Alert(message)
case syslog.LOG_CRIT:
err = xl.SYSLOG.Crit(message)
case syslog.LOG_ERR:
err = xl.SYSLOG.Err(message)
case syslog.LOG_WARNING:
err = xl.SYSLOG.Warning(message)
case syslog.LOG_NOTICE:
err = xl.SYSLOG.Notice(message)
case syslog.LOG_INFO:
err = xl.SYSLOG.Info(message)
default:
err = xl.SYSLOG.Debug(message)
}
if err != nil {
xl.STDERR.Printf("SYSLOG failed \"%s\" to write %s. Message was: \"%s\"", err.Error(), level, message)
}
}
}
// Unified log implementation. Less code >> more CPU.
func (xl XLog) Debug (message string) { xl.Log(syslog.LOG_DEBUG, message) }
func (xl XLog) Debugf (message string, values ...interface{}) { xl.Log(syslog.LOG_DEBUG, fmt.Sprintf(message, values...)) }
func (xl XLog) Info (message string) { xl.Log(syslog.LOG_INFO, message) }
func (xl XLog) Infof (message string, values ...interface{}) { xl.Log(syslog.LOG_INFO, fmt.Sprintf(message, values...)) }
func (xl XLog) Notice (message string) { xl.Log(syslog.LOG_NOTICE, message) }
func (xl XLog) Noticef (message string, values ...interface{}) { xl.Log(syslog.LOG_NOTICE, fmt.Sprintf(message, values...)) }
//
func (xl XLog) Warning (message string) { xl.Log(syslog.LOG_WARNING, message) }
func (xl XLog) Warn (message string) { xl.Log(syslog.LOG_WARNING, message) }
func (xl XLog) Warnf (message string, values ...interface{}) { xl.Log(syslog.LOG_WARNING, fmt.Sprintf(message, values...)) }
//
func (xl XLog) Err (message string) { xl.Log(syslog.LOG_ERR, message) }
func (xl XLog) Error (message string) { xl.Log(syslog.LOG_ERR, message) }
func (xl XLog) Errf (message string, values ...interface{}) { xl.Log(syslog.LOG_ERR, fmt.Sprintf(message, values...)) }
//
func (xl XLog) Crit (message string) { xl.Log(syslog.LOG_CRIT, message) }
func (xl XLog) Critical (message string) { xl.Log(syslog.LOG_CRIT, message) }
func (xl XLog) Critf (message string, values ...interface{}) { xl.Log(syslog.LOG_CRIT, fmt.Sprintf(message, values...)) }
//
func (xl XLog) Alert (message string) { xl.Log(syslog.LOG_ALERT, message) }
func (xl XLog) Alertf (message string, values ...interface{}) { xl.Log(syslog.LOG_ALERT, fmt.Sprintf(message, values...)) }
//
func (xl XLog) Emerg (message string) { xl.Log(syslog.LOG_EMERG, message) }
func (xl XLog) Fatal (message string) { xl.Log(syslog.LOG_EMERG, message) }
func (xl XLog) Emergf (message string, values ...interface{}) { xl.Log(syslog.LOG_EMERG, fmt.Sprintf(message, values...)) }