internal

type DialSettings struct {
	Endpoint        string
	Scopes          []string
	TokenSource     oauth2.TokenSource
	Credentials     *google.Credentials
	CredentialsFile string // if set, Token Source is ignored.
	CredentialsJSON []byte
	UserAgent       string
	APIKey          string
	Audiences       []string
	HTTPClient      *http.Client
	GRPCDialOpts    []grpc.DialOption
	GRPCConn        *grpc.ClientConn
	NoAuth          bool

	// Google API system parameters. For more information please read:
	// https://cloud.google.com/apis/docs/system-parameters
	QuotaProject  string
	RequestReason string
}

type Operation uint8

type PoolResolver struct {
	// contains filtered or unexported fields
}

type Update struct {
	// Op indicates the operation of the update.
	Op Operation
	// Addr is the updated address. It is empty string if there is no address update.
	Addr string
	// Metadata is the updated metadata. It is nil if there is no metadata update.
	// Metadata is not required for a custom naming implementation.
	Metadata interface{}
}

type Watcher interface {
	// Next blocks until an update or error happens. It may return one or more
	// updates. The first call should get the full set of the results. It should
	// return an error if and only if Watcher cannot recover.
	Next() ([]*Update, error)
	// Close closes the Watcher.
	Close()
}