config

type Config interface {
	Load() error
	Scan(v interface{}) error
	Value(key string) Value
	Watch(key string, o Observer) error
	Close() error
}

type Decoder func(src map[string]interface{}, dst interface{}) error

type KeyValue struct {
	Key   string
	Value string
	// Format 是配置内容的格式，例如 "json", "yaml", "toml", "properties"
	Format string
}

type Observer func(string, Value)

type Option func(*options)

type Reader interface {
	Merge(*KeyValue)
	Value(string) (Value, error)
	Values(string) (map[string]interface{}, error)
}

type Resolver func(string) string

type Source interface {
	Load() ([]*KeyValue, error)
	Watch() (Watcher, error)
}

type Value interface {
	Bool() (bool, error)
	Int() (int64, error)
	Float() (float64, error)
	String() (string, error)
	Duration() (time.Duration, error)
	Slice() ([]Value, error)
	Map() (map[string]Value, error)
	Scan(interface{}) error
}

type ValueCallback func(string, Value)

type Watcher interface {
	Next() ([]*KeyValue, error)
	Stop() error
}