filtered_writer_above.go

package logger

import "github.com/rs/zerolog"

type FilteredWriterAbove struct {
	Writer zerolog.LevelWriter
	Level  zerolog.Level
}

func (w *FilteredWriterAbove) Write(p []byte) (n int, err error) {
	return w.Writer.Write(p)
}
func (w *FilteredWriterAbove) WriteLevel(level zerolog.Level, p []byte) (n int, err error) {
	if level >= w.Level {
		return w.Writer.WriteLevel(level, p)
	}
	return len(p), nil
}

filtered_writer_below.go

package logger

import "github.com/rs/zerolog"

type FilteredWriterBelow struct {
	Writer zerolog.LevelWriter
	Level  zerolog.Level
}

func (w *FilteredWriterBelow) Write(p []byte) (n int, err error) {
	return w.Writer.Write(p)
}
func (w *FilteredWriterBelow) WriteLevel(level zerolog.Level, p []byte) (n int, err error) {
	if level <= w.Level {
		return w.Writer.WriteLevel(level, p)
	}
	return len(p), nil
}

main.go

package main

func initLog() *zerolog.Logger {

	zerolog.ErrorStackMarshaler = pkgerrors.MarshalStack

	fCommon, _ := os.OpenFile("../data/log/common.log", os.O_APPEND|os.O_CREATE|os.O_RDWR, 0644)
	fWarn, _ := os.OpenFile("../data/log/error.log", os.O_APPEND|os.O_CREATE|os.O_RDWR, 0644)

	writerCommon := zerolog.MultiLevelWriter(fCommon)
	writerWarn := zerolog.MultiLevelWriter(fWarn)
	filteredWriteCommon := &logger.FilteredWriterBelow{Writer: writerCommon, Level: zerolog.InfoLevel}
	filteredWriterWarn := &logger.FilteredWriterAbove{Writer: writerWarn, Level: zerolog.WarnLevel}

	writer := zerolog.MultiLevelWriter(
		zerolog.ConsoleWriter{Out: os.Stdout},
		filteredWriteCommon,
		filteredWriterWarn,
	)

	log := zerolog.New(writer).With().Caller().Timestamp().Logger()

	return &log
}