Detecting end of file on 'file_source'?

I’m using the ‘file_source’ module to simulate a data stream. At the end
of a sequence of blocks,
I have a ‘message_sink’. However, I don’t seem to get any indication of
the end of file condition
when the file_source module detects that state.

Basically the message handler just hangs waiting for more messages.

Is there some ‘Except’ condition that is transmitted to python that I’m

John C…