config

type Config interface {
	Raw() []byte
	Unmarshal(v interface{}) error
	Get(key string) (interface{}, bool)
	GetString(key string) (string, bool)
	GetBool(key string) (bool, bool)
	GetInt(key string) (int64, bool)
	GetFloat(key string) (float64, bool)
	GetDuration(key string) (time.Duration, bool)
	GetTime(key string) (time.Time, bool)
}

type Data interface {
	Unmarshal(interface{}) error
	Raw() []byte
}

type Source interface {
	// 如果path是以/结尾，则是目录，否则当作key处理
	Subscribe(path string) Watcher
	Get(ctx context.Context, path string) []Spec
}

type Spec struct {
	Key  string
	Data Data
}

type Watcher interface {
	// Watch 第一次访问的时候如果有值则立马返回spec；后面watch的时候有变更才返回
	// 如果不传key则watch整个文件变动
	// 如果超时或者Watcher被Close应当抛出错误
	Watch(ctx context.Context) ([]Spec, error)
	Close()
}