relay

type CallFrame interface {
	// Caller is the name of the originating service.
	Caller() []byte
	// Service is the name of the destination service.
	Service() []byte
	// Method is the name of the method being called.
	Method() []byte
	// RoutingDelegate is the name of the routing delegate, if any.
	RoutingDelegate() []byte
	// RoutingKey may refer to an alternate traffic group instead of the
	// traffic group identified by the service name.
	RoutingKey() []byte
}

type Conn interface {
	// RemoteHostPort returns the host:port of the remote peer.
	RemoteHostPort() string
}

type RateLimitDropError struct{}