const (
	// Environment variable used to configure an HTTP proxy for discovery
	DiscoveryProxyEnv = "ETCD_DISCOVERY_PROXY"
)

var (
	ErrInvalidURL     = errors.New("discovery: invalid URL")
	ErrBadSizeKey     = errors.New("discovery: size key is bad")
	ErrSizeNotFound   = errors.New("discovery: size key not found")
	ErrTokenNotFound  = errors.New("discovery: token not found")
	ErrDuplicateID    = errors.New("discovery: found duplicate id")
	ErrFullCluster    = errors.New("discovery: cluster is full")
	ErrTooManyRetries = errors.New("discovery: too many retries")
)

type Discoverer interface {
	Discover() (string, error)
}