log

type Config struct {
	App    string            `json:"app,omitempty" yaml:"app"`
	Format string            `json:"format,omitempty" yaml:"format"` // text(default) json
	Level  string            `json:"level,omitempty" yaml:"level"`   // debug(default) < info < warn < error
	Stdout bool              `json:"stdout,omitempty" yaml:"stdout"`
	Rotate lumberjack.Logger `json:"rotate" yaml:"rotate"`
}

type Logger struct {
	// contains filtered or unexported fields
}