func newFileCore()

in log/zaplogger.go [144:177]

• 29 lines of code
• 4 McCabe index (conditional complexity)

func newFileCore(c *OutputConfig) (zapcore.Core, zap.AtomicLevel, error) {
	opts := []rollwriter.Option{
		rollwriter.WithMaxAge(c.WriteConfig.MaxAge),
		rollwriter.WithMaxBackups(c.WriteConfig.MaxBackups),
		rollwriter.WithCompress(c.WriteConfig.Compress),
		rollwriter.WithMaxSize(c.WriteConfig.MaxSize),
	}
	// roll by time.
	if c.WriteConfig.RollType != RollBySize {
		opts = append(opts, rollwriter.WithRotationTime(c.WriteConfig.TimeUnit.Format()))
	}
	writer, err := rollwriter.NewRollWriter(c.WriteConfig.Filename, opts...)
	if err != nil {
		return nil, zap.AtomicLevel{}, err
	}

	// write mod.
	var ws zapcore.WriteSyncer
	if c.WriteConfig.WriteMode == WriteSync {
		ws = zapcore.AddSync(writer)
	} else {
		dropLog := c.WriteConfig.WriteMode == WriteFast
		ws = rollwriter.NewAsyncRollWriter(writer,
			rollwriter.WithDropLog(dropLog),
		)
	}

	// log level.
	lvl := zap.NewAtomicLevelAt(Levels[c.Level])
	return zapcore.NewCore(
		newEncoder(c),
		ws, lvl,
	), lvl, nil
}