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log using uber zap and lumberjack (zapcore.AddSync version)
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// thanks to: | |
// https://github.com/uber-go/zap/blob/master/FAQ.md#does-zap-support-log-rotation | |
// https://studygolang.com/articles/17394 | |
// https://stackoverflow.com/questions/54395407/zap-logging-with-1-customized-config-and-2-lumberjack | |
// Please test and debug it before putting it in production. | |
package logger | |
import ( | |
"fmt" | |
"os" | |
"go.uber.org/zap" | |
"go.uber.org/zap/zapcore" | |
lumberjack "gopkg.in/natefinch/lumberjack.v2" | |
) | |
const ( | |
// DPanic, Panic and Fatal level can not be set by user | |
DebugLevelStr string = "debug" | |
InfoLevelStr string = "info" | |
WarningLevelStr string = "warning" | |
ErrorLevelStr string = "error" | |
) | |
var ( | |
globalLogger *zap.Logger | |
devMode bool = false | |
) | |
// call it in defer | |
func Sync() error { | |
return globalLogger.Sync() | |
} | |
func Init(logLevel string, logFile string, dev bool) error { | |
devMode = dev | |
var level zapcore.Level | |
switch logLevel { | |
case DebugLevelStr: | |
level = zap.DebugLevel | |
case InfoLevelStr: | |
level = zap.InfoLevel | |
case WarningLevelStr: | |
level = zap.WarnLevel | |
case ErrorLevelStr: | |
level = zap.ErrorLevel | |
default: | |
return fmt.Errorf("unknown log level %s", logLevel) | |
} | |
ws := zapcore.AddSync(&lumberjack.Logger{ | |
Filename: logFile, | |
MaxSize: 1, //MB | |
MaxBackups: 30, | |
MaxAge: 90, //days | |
Compress: false, | |
}) | |
core := zapcore.NewCore( | |
// use NewConsoleEncoder for human readable output | |
zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig()), | |
// write to stdout as well as log files | |
zapcore.NewMultiWriteSyncer(zapcore.AddSync(os.Stdout), ws), | |
zap.NewAtomicLevelAt(level), | |
) | |
var _globalLogger *zap.Logger | |
if dev { | |
_globalLogger = zap.New(core, zap.AddCaller(), zap.Development()) | |
} else { | |
_globalLogger = zap.New(core) | |
} | |
zap.ReplaceGlobals(_globalLogger) | |
globalLogger = _globalLogger | |
return nil | |
} | |
func NewSugar(name string) *zap.SugaredLogger { | |
return globalLogger.Named(name).Sugar() | |
} |
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