conns

type ClientContext struct {
	ClientConn *grpc.ClientConn
	Ctx        context.Context
	Cancel     context.CancelFunc
}

type ConnName struct {
	Conns_ Conns `dot:"?"` //可选组件，优先使用etcd
	// contains filtered or unexported fields
}

type Conns interface {
	//Return default connection, only one connection
	DefaultClientConn() *grpc.ClientConn
	//Return server name corresponding connection
	ClientConn(serviceName string) *grpc.ClientConn
	//Return ClientContext
	ClientContext(serviceName string) *ClientContext
	//return service name
	ServiceName() []string
	//return schemeName,  Scheme is defined at https://github.com/grpc/grpc/blob/master/doc/naming.md
	SchemeName() string
}

type ConnsConfig struct {
	Scheme   string          `json:"scheme"`
	Services []ServiceConfig `json:"services"` //与etcd是并列的关系，如果name相同时，etcd更优先
}

type ServiceConfig struct {
	Name    string          `json:"name"`
	Addrs   []string        `json:"addrs"`
	Tls     utils.TlsConfig `json:"tls"`
	Balance string          `json:"balance"` // round or first, the default value is round
}