balancer

type PickerBuildInfo struct {
	// ReadySCs is a map from all ready SubConns to the Addresses can be used.
	ReadySCs map[balancer.SubConn]base.SubConnInfo

	// UnReadySCs is a map from all unready SubConns to the Addresses can be used.
	UnReadySCs map[balancer.SubConn]base.SubConnInfo
}

type PickerBuilder interface {
	// Build returns a picker that will be used by gRPC to pick a SubConn.
	Build(info PickerBuildInfo) balancer.Picker
}