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package logr
import (
"io"
"log"
"os"
)
var defaultLogger = New(LevelInfo, false, os.Stdout)
type Logger struct {
// threshold is the minimum level output by this logger.
//
// For example, if the threshold is set to LevelWarn, then only logs of LevelWarn and LevelError will be output
// while logs of LevelDebug and LevelInfo will be ignored.
//
// Defaults to LevelInfo.
threshold Level
// shouldPrefixMessageWithLevel is whether to include the log level prefix in each log.
//
// For example, if this is set to true, then a debug log would output "<date> DEBUG <message>"
//
// Defaults to false.
shouldPrefixMessageWithLevel bool
stdLogger *log.Logger
}
// New creates a new logger with the given threshold and output.
func New(threshold Level, shouldPrefixMessageWithLevel bool, output io.Writer) *Logger {
if !threshold.IsValid() {
threshold = LevelInfo // Default to LevelInfo if the threshold is invalid
}
return &Logger{
threshold: threshold,
shouldPrefixMessageWithLevel: shouldPrefixMessageWithLevel,
stdLogger: log.New(output, "", log.LstdFlags),
}
}
func (logger *Logger) SetOutput(output io.Writer) {
// Because we're using the standard log package under the hood, we can just directly pass this
// to the logger and call it a day. It already takes care of locking and discarding the previous writer.
logger.stdLogger.SetOutput(output)
}
func (logger *Logger) SetThreshold(threshold Level) {
if !threshold.IsValid() {
threshold = LevelInfo // Default to LevelInfo if the threshold is invalid
} else {
logger.threshold = threshold
}
}
func (logger *Logger) GetThreshold() Level {
return logger.threshold
}
func (logger *Logger) Log(level Level, message string) {
logger.Logf(level, message)
}
func (logger *Logger) Logf(level Level, format string, args ...any) {
if level.Value() < logger.threshold.Value() {
// The log level is below the threshold, so ignore the log
return
}
if logger.shouldPrefixMessageWithLevel {
format = "- " + string(level) + " - " + format
}
logger.stdLogger.Printf(format, args...)
if level == LevelFatal {
os.Exit(1)
}
}
func (logger *Logger) Debug(message string) {
logger.Log(LevelDebug, message)
}
func (logger *Logger) Debugf(format string, args ...any) {
logger.Logf(LevelDebug, format, args...)
}
func (logger *Logger) Info(message string) {
logger.Log(LevelInfo, message)
}
func (logger *Logger) Infof(format string, args ...any) {
logger.Logf(LevelInfo, format, args...)
}
func (logger *Logger) Warn(message string) {
logger.Log(LevelWarn, message)
}
func (logger *Logger) Warnf(format string, args ...any) {
logger.Logf(LevelWarn, format, args...)
}
func (logger *Logger) Error(message string) {
logger.Log(LevelError, message)
}
func (logger *Logger) Errorf(format string, args ...any) {
logger.Logf(LevelError, format, args...)
}
func (logger *Logger) Fatal(message string) {
logger.Log(LevelFatal, message)
}
func (logger *Logger) Fatalf(format string, args ...any) {
logger.Logf(LevelFatal, format, args...)
}
// SetOutput sets the output of the default logger
func SetOutput(output io.Writer) {
defaultLogger.SetOutput(output)
}
// SetThreshold sets the minimum level output by the default logger
func SetThreshold(threshold Level) {
defaultLogger.SetThreshold(threshold)
}
func GetThreshold() Level {
return defaultLogger.GetThreshold()
}
func Log(level Level, message string) {
defaultLogger.Log(level, message)
}
func Logf(level Level, message string, args ...any) {
defaultLogger.Logf(level, message, args)
}
func Debug(message string) {
defaultLogger.Debug(message)
}
func Debugf(format string, args ...any) {
defaultLogger.Debugf(format, args...)
}
func Info(message string) {
defaultLogger.Info(message)
}
func Infof(format string, args ...any) {
defaultLogger.Infof(format, args...)
}
func Warn(message string) {
defaultLogger.Warn(message)
}
func Warnf(format string, args ...any) {
defaultLogger.Warnf(format, args...)
}
func Error(message string) {
defaultLogger.Error(message)
}
func Errorf(format string, args ...any) {
defaultLogger.Errorf(format, args...)
}
func Fatal(message string) {
defaultLogger.Fatal(message)
}
func Fatalf(format string, args ...any) {
defaultLogger.Fatalf(format, args...)
}
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