backend

type ConfigItem struct {
	Type    string `json:"type"`
	Hint    string `json:"hint"`
	Value   string `json:"value"`
	Comment string `json:"comment"`
}

type ConfigItems map[string]*ConfigItem

type EventChan chan *WatchEvent

type EventType string

type KVPair struct {
	Key   string
	Value string
}

type KVPairs []*KVPair

type Provider interface {
	// Type returns the provider type.
	Type() string

	// Set value for the specified key with a specified ttl.
	Set(key, value string, ttl time.Duration) error

	// Get the value of the specified key or directory.
	Get(key string, dir bool) (KVPairs, error)

	// Incr invokes an atomic value increase for the specified key.
	Incr(key string) (int64, error)

	// Delete the specified key or directory.
	Delete(key string, dir bool) error

	// Watch for changes of the specified key or directory.
	Watch(key string, dir bool) (EventChan, error)

	// KeepAlive sets value and updates the ttl for the specified key.
	KeepAlive(key, value string, ttl time.Duration) error

	// Close the provider connection.
	Close() error
}

type WatchEvent struct {
	KVPair
	Type EventType
}