+
+ // EventMessage encodes the given event (from the front of the
+ // queue) into a form suitable to send to the client. If a
+ // non-nil error is returned, the connection is terminated. If
+ // the returned buffer is empty, nothing is sent to the client
+ // and the event is not counted in statistics.
+ //
+ // Unlike Filter, EventMessage can block without affecting
+ // other connections. If EventMessage is slow, additional
+ // incoming events will be queued. If the event queue fills
+ // up, the connection will be dropped.
+ EventMessage(*event) ([]byte, error)