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package logger
import (
"fmt"
"os"
"strings"
"time"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
const prefixWidth = 15
var (
loggerInstance *zap.Logger
level zap.AtomicLevel
showTimestamp bool
)
func timeEncoder(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
enc.AppendString(Gray + t.Format(time.RFC3339) + Reset)
}
func levelEncoder(l zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {
switch l {
case zapcore.DebugLevel:
enc.AppendString(LevelColorDebug)
case zapcore.WarnLevel:
enc.AppendString(LevelColorWarn)
case zapcore.ErrorLevel:
enc.AppendString(LevelColorError)
default:
enc.AppendString(LevelColorInfo)
}
}
func formatPrefix(prefix string) string {
if prefix == "" {
return ""
}
padding := ""
if len(prefix) < prefixWidth {
padding = strings.Repeat(" ", prefixWidth-len(prefix))
}
return Cyan + "[" + prefix + "]" + Reset + padding
}
func colorMessage(level LogLevel, msg string) string {
switch level {
case Debug:
return MessageColorDebug + msg + Reset
case Warn:
return MessageColorWarn + msg + Reset
case Error:
return MessageColorError + msg + Reset
case Success:
return MessageColorSuccess + msg + Reset
default:
return MessageColorInfo + msg + Reset
}
}
func Init() {
level = zap.NewAtomicLevelAt(zapcore.InfoLevel)
encoderCfg := zapcore.EncoderConfig{
LevelKey: "level",
MessageKey: "msg",
LineEnding: "\n",
EncodeLevel: levelEncoder,
}
if showTimestamp {
encoderCfg.TimeKey = "ts"
encoderCfg.EncodeTime = timeEncoder
}
encoder := zapcore.NewConsoleEncoder(encoderCfg)
stdout := zapcore.AddSync(os.Stdout)
stderr := zapcore.AddSync(os.Stderr)
core := zapcore.NewTee(
zapcore.NewCore(encoder, stdout, zap.LevelEnablerFunc(func(l zapcore.Level) bool {
return l < zapcore.WarnLevel && level.Enabled(l)
})),
zapcore.NewCore(encoder, stderr, zap.LevelEnablerFunc(func(l zapcore.Level) bool {
return l >= zapcore.WarnLevel && level.Enabled(l)
})),
)
loggerInstance = zap.New(core, zap.AddCaller())
}
func SetTimestamp(enabled bool) {
showTimestamp = enabled
}
func SetDebug(enabled bool) {
if enabled {
level.SetLevel(zapcore.DebugLevel)
} else {
level.SetLevel(zapcore.InfoLevel)
}
}
func Debugf(prefix, format string, args ...any) {
log(Debug, zapcore.DebugLevel, prefix, fmt.Sprintf(format, args...))
}
func Infof(prefix, format string, args ...any) {
log(Info, zapcore.InfoLevel, prefix, fmt.Sprintf(format, args...))
}
func Successf(prefix, format string, args ...any) {
log(Success, zapcore.InfoLevel, prefix, fmt.Sprintf(format, args...))
}
func Warnf(prefix, format string, args ...any) {
log(Warn, zapcore.WarnLevel, prefix, fmt.Sprintf(format, args...))
}
func Errorf(prefix, format string, args ...any) {
log(Error, zapcore.ErrorLevel, prefix, fmt.Sprintf(format, args...))
}
func Fatalf(prefix, format string, args ...any) {
log(Error, zapcore.ErrorLevel, prefix, fmt.Sprintf(format, args...))
os.Exit(1)
}
func log(levelLabel LogLevel, zapLevel zapcore.Level, prefix string, msg any) {
if loggerInstance == nil {
panic("logger.Init() was not called")
}
message := fmt.Sprint(msg)
colored := colorMessage(levelLabel, message)
fullMessage := formatPrefix(prefix) + colored
loggerInstance.Log(zapLevel, fullMessage)
}
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