event

type Event struct {
	Title    string                 `json:"title,omitempty"`
	Params   map[string]interface{} `json:"params,omitempty"`
	Messages []*Message             `json:"messages,omitempty"`
	Children []*Event               `json:"children,omitempty"`
}

type Message struct {
	Level   string `json:"level,omitempty"`
	Content string `json:"content,omitempty"`
}

type WhereEvent struct {
	// Name is the name of where op, such as 'and', 'contains'.
	Name string `json:"name,omitempty"`
	// Result is the bool result of where op
	Result bool `json:"result"`
	// Children contains sub where op events. For example, 'and' may contain 2 children WhereEvent.
	Children []*WhereEvent `json:"children,omitempty"`
}