Hi, Thank you for the reply.
Unlikely it is the case (if I understand it correctly). The exception is thrown by "enumSocket", I added traces to prove that. And it is propagated to "runWithSocket" ( http://hackage.haskell.org/packages/archive/websockets/0.7.4.0/doc/html/src/Network-WebSockets-Socket.html#runWithSocket ), so that "Data.Enumerator.run" returns "Left". So actually it is not an IO exception, but it is thrown via "throwError". Looks like I don't have other options except to reimplement websockets protocol myself :( Thanks, Yuras On Tue, 2013-08-27 at 15:40 -0400, Ben Doyle wrote: > This is partially guesswork, but the code to catchWSError looks > dubious: > > > catchWsError :: WebSockets p a > -> (SomeException -> WebSockets p a) > -> WebSockets p a > catchWsError act c = WebSockets $ do > env <- ask > let it = peelWebSockets env $ act > cit = peelWebSockets env . c > lift $ it `E.catchError` cit > where > peelWebSockets env = flip runReaderT env . unWebSockets > > Look at `cit`. It runs the recovery function, then hands the underlying > Iteratee the existing environment. That's fine if `act` is at fault, but > there are Iteratee- and IO-ish things in WebSocketsEnv---if one of `envSink` > or `envSendBuilder` is causing the exception, it'll just get re-thrown after > `E.catchError`. (I think. That's the guesswork part.) > So check how `envSendBuilder` is built up, and see if there's a way it could > throw an exception on client disconnect. > > > On Tue, Aug 27, 2013 at 10:28 AM, Yuras Shumovich > <shumovi...@gmail.com> wrote: > Hello, > > I'm debugging an issue in "websockets" package, > https://github.com/jaspervdj/websockets/issues/42 > > I'm not familiar with "enumerator" package (websockets are > based on it), > so I'm looking for help. The exception is throws inside > "enumSocket" > enumerator using > "throwError" ( > http://hackage.haskell.org/packages/archive/network-enumerator/0.1.5/doc/html/src/Network-Socket-Enumerator.html#enumSocket > ), but I can't catch it with "catchError". It is propagated to "run" > function: > <interactive>: recv: resource vanished (Connection reset by > peer) > > The question is: how is it possible? could it be a bug in > "enumerator" > package? > > Thanks, > Yuras > > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
