log

type Entry struct {
	Timestamp time.Time
	Level     Level
	Message   string
	Fields    Fields
}

type Field struct {
	Key   string
	Value interface{}
}

type Fields map[string]interface{}

type Handler interface {
	Log(log *Entry) error
}

type Level uint8

type Log interface {
	Field(key string, value interface{}) Log
	Fields(fields map[string]interface{}) Log
	Debug(msg string, args ...interface{}) error
	Info(msg string, args ...interface{}) error
	Notice(msg string, args ...interface{}) error
	Warn(msg string, args ...interface{}) error
	Error(msg string, args ...interface{}) error
	Err(err error, msg string, args ...interface{}) error
}

type Logger struct {
	Handler Handler
}