On Fri, Apr 29, 2011 at 12:00 AM, Don Stewart <don...@gmail.com> wrote: > I'm very interested in what the best way to get incremental event data > from a running GHC process would be. > > Looking at the code, we flush the event buffer fairly regularly, but > the event parser is currently strict. > > So we'd need a lazy (or incremental) parser, that'll return a list of > successful event parses, then block. I suspect this mode would be > supported. > > *My evil plan is to write a little monitoring web app that just > attaches to the event stream and renders it in a useful "heartbeat" > format* , but I need incremental parsing.
A less general solution might be to have the program itself start a little web server on some port and use the API I proposed to serve JSON data with the aggregate statistics you care about. Example: main = do eventData <- newIORef server <- serveOn 8080 $ \ _req -> readIORef eventData >>= sendResponse eventData registerEventListener $ \ ev -> updateEventData eventData ev runNormalProgram You can wrap the creation of the webserver in a little helper function an make any program "monitorable" simply by doing main = withMonitoring runApp withMonitoring would take care of starting/stopping the webserver and processing events. Just a thought. Johan _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users