Hi All, A combined reply ...
[Stephen Masterman] >Anyway, your problem may have nothing to do with the details of your >application if something like this is happening, so you should verify >that you can successfully connect at all. Good advice, and yes, we did confirm the connection upfront in a simple unittest, we test the connection, storing and retrieving from the ZODB with ZEO client/server. The client and server run on different machines. (XP and linux respectively) [Dieter Maurer] > > As long as you ensure that the "asyncore" mainloop is running, there >> should not be a problem to have more "asyncore" clients. >> >> If you happen to run your application on Linux (and use the "GDB"), I >> can provide detailed instructions on how to find out where your code >> hangs... > >That would be helpful! As said above, the client runs on Windows XP, the server on Linux (debian). [Tim Peters] >asyncore gives me a headache. Same here > I wonder whether this could be the problem: >Paul said he's calling ZEO "from within the proxy code", but it sounds like >the proxy code itself runs "as a side effect" of asyncore callbacks. If the >flow is like this: > > asyncore mainloop invokes POP3 proxy code > POP3 proxy code makes a synchronous ZEO call I think that's exactly how the Proxy runs, we use asynchat and the 'line_terminator' to trigger a callback, so it appears the code runs 'magically' at first glance. >then I figure the app may well hang then: the thread running the asyncore >mainloop is still running a POP3 proxy callback, waiting for a response that >can never happen until the asyncore mainloop gets control back (in order to >send & receive ZEO messages). > >IOW, if Paul added print statements to ZODB's ZEO/zrpc/smac.py's >SizedMessageAsyncConnection readable() and writable() methods, I bet they >never trigger when the app appears to be hung (which would mean that the >thread running asyncore's mainloop is in fact not getting a chance to run >the asyncore loop anymore). You're right - I added the suggested comments as first line in the readable() and writable() methods they never appear. Could I do synchronous calls to the ZEO server? An other option to bypass the problem is to use Zope/XMLRPC to do what we want, I assume that will not suffer they same problem. Your opinion would be much appreciated, Thanks -- Vriendelijke groet, Paul -- Vriendelijke groet, Paul _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
