etcd

type Client interface {
	// Put 存储键值对
	Put(ctx context.Context, key, value string, opts ...interface{}) error
	// Get 获取键值
	Get(ctx context.Context, key string, opts ...interface{}) (string, error)
	// Delete 删除键
	Delete(ctx context.Context, key string, opts ...interface{}) error
	// List 列出指定前缀的所有键值对
	List(ctx context.Context, prefix string, opts ...interface{}) (map[string]string, error)
	// Watch 监听键变化
	Watch(ctx context.Context, key string, opts ...interface{}) (<-chan WatchEvent, error)
	// Register 服务注册
	Register(ctx context.Context, serviceKey, serviceValue string, ttl int64) error
	// Unregister 服务注销
	Unregister(ctx context.Context, serviceKey string) error
	// Discover 服务发现
	Discover(ctx context.Context, servicePrefix string) ([]ServiceEndpoint, error)
	// Close 关闭客户端
	Close() error
}

type ClientConfig struct {
	Endpoints   []string
	Username    string
	Password    string
	Namespace   string
	DialTimeout time.Duration
	Timeout     time.Duration
	TLS         *tls.Config
}

type ServiceEndpoint struct {
	Address string            `json:"address"`
	Port    int               `json:"port"`
	Meta    map[string]string `json:"meta"`
}

type WatchEvent struct {
	Type  WatchEventType
	Key   string
	Value string
}

type WatchEventType int