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levellogger.go
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levellogger.go
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package mlog
import (
"fmt"
"strconv"
"strings"
)
// Level defines log levels, corresponding to systemd/sd-daemon levels
// (see https://www.freedesktop.org/software/systemd/man/latest/sd-daemon.html).
type Level int
func (l Level) Prefix() string {
return "<" + strconv.Itoa(int(l)) + ">"
}
func ParseLevel(s string) (Level, error) {
switch strings.ToLower(s) {
case "emergency":
return LevelEmergency, nil
case "alert":
return LevelAlert, nil
case "critical":
return LevelCritical, nil
case "error":
return LevelError, nil
case "warning":
return LevelWarning, nil
case "notice":
return LevelNotice, nil
case "info":
return LevelInfo, nil
case "debug":
return LevelDebug, nil
default:
return 0, fmt.Errorf("invalid log level: %s", s)
}
}
func (l Level) String() string {
switch l {
case LevelEmergency:
return "emergency"
case LevelAlert:
return "alert"
case LevelCritical:
return "critical"
case LevelError:
return "error"
case LevelWarning:
return "warning"
case LevelNotice:
return "notice"
case LevelInfo:
return "info"
case LevelDebug:
return "debug"
default:
return l.Prefix()
}
}
const (
// LevelEmergency marks messages that show the system is unusable
LevelEmergency = Level(0)
// LevelAlert marks messages that show an action must be taken immediately
LevelAlert = Level(1)
// LevelCritical marks messages for critical conditions
LevelCritical = Level(2)
// LevelError marks messages for error conditions
LevelError = Level(3)
// LevelWarning marks messages for warning conditions
LevelWarning = Level(4)
// LevelNotice marks a normal but significant condition
LevelNotice = Level(5)
// LevelInfo marks informational entries
LevelInfo = Level(6)
// LevelDebug marks debug-level messages
LevelDebug = Level(7)
)
// LevelLogger defines a log API including log level.
// It is meant as an optional extension for Logger implementations
type LevelLogger interface {
// Lprint calls Output to print to the standard logger.
// Arguments are handled in the manner of fmt.Print.
Lprint(level Level, v ...interface{})
// Lprintf calls Output to print to the standard logger.
// Arguments are handled in the manner of fmt.Printf.
Lprintf(level Level, format string, v ...interface{})
// Lprintln calls Output to print to the standard logger.
// Arguments are handled in the manner of fmt.Println.
Lprintln(level Level, v ...interface{})
}
// WithLevel wraps a Logger in a new one that logs at the given level (if logger implements LevelLogger).
// If logger doesn't implement LevelLogger, it returns the given logger unchanged.
//
// mlog.WithLevel(logger, mlog.Critical).Println(...)
// mlog.Critical(logger).Println(...)
func WithLevel(logger Logger, level Level) Logger {
if levelLogger, ok := logger.(LevelLogger); ok {
return LevelLoggerAdapter{
previous: levelLogger,
level: level,
}
} else {
return logger
}
}
func Emergency(logger Logger) Logger {
return WithLevel(logger, LevelEmergency)
}
func Alert(logger Logger) Logger {
return WithLevel(logger, LevelAlert)
}
func Critical(logger Logger) Logger {
return WithLevel(logger, LevelCritical)
}
func Error(logger Logger) Logger {
return WithLevel(logger, LevelError)
}
func Warning(logger Logger) Logger {
return WithLevel(logger, LevelWarning)
}
func Notice(logger Logger) Logger {
return WithLevel(logger, LevelNotice)
}
func Info(logger Logger) Logger {
return WithLevel(logger, LevelInfo)
}
func Debug(logger Logger) Logger {
return WithLevel(logger, LevelDebug)
}
type LevelLoggerAdapter struct {
previous LevelLogger
level Level
}
func (l LevelLoggerAdapter) Print(v ...interface{}) {
l.previous.Lprint(l.level, v...)
}
func (l LevelLoggerAdapter) Printf(format string, v ...interface{}) {
l.previous.Lprintf(l.level, format, v...)
}
func (l LevelLoggerAdapter) Println(v ...interface{}) {
l.previous.Lprintln(l.level, v...)
}