healthcheck

type HTTPServer interface {
	// Server is designed so that http.Server satifies this interface,
	Serve(listener net.Listener) error
}

type HTTPServerFactory interface {
	// New creates an instance of a type satisfying HTTPServer.  This is
	// designed to include http.Server.
	New(addr string, handler http.Handler) HTTPServer
}

type Listener interface {
	// Listen is very much like net.Listen, except the first arg (network) is
	// fixed to be "tcp".
	Listen(addr string) (net.Listener, error)
}

type Server interface {
	// Make the new set of services be active.  Services that were open before
	// will be closed.  Services that are new will be opened.  Service that
	// existed and are in the new set will be left alone.  The value of the map
	// is the healthcheck-port to listen on.
	SyncServices(newServices map[types.NamespacedName]uint16) error
	// Make the new set of endpoints be active.  Endpoints for services that do
	// not exist will be dropped.  The value of the map is the number of
	// endpoints the service has on this node.
	SyncEndpoints(newEndpoints map[types.NamespacedName]int) error
}