[Twisted-Python] Strange downloadPage behavior with embedded Python

Jean-Paul Calderone exarkun at divmod.com
Thu Dec 4 10:43:01 EST 2008

On Thu, 4 Dec 2008 10:28:46 -0500, James Joplin <thejayjay at gmail.com> wrote:
>We have been using python embedded via the C API and have used Twisted for
>various things.  We have come across some strange behavior and I cannot
>figure out what is going on.
>from twisted.internet import reactor
>from twisted.web.client import downloadPage
>def fetchRepo():
>        global gameType, gameName, setupComplete, cp
>        if (setupComplete):
>                url = urlbase + "/" + gameType + "/" + gameName +
>                print "url is : " + url
>                d = downloadPage(url, "C:\\svntest\\gamerepo.ini")
>                d.addCallback(downloadSuccess)
>                d.addErrback(downloadFailure)
>                #cp.readfp(open("C:\\game-repo.ini"))
>        else:
>                print "urls not setup, throw errors etc."
>This is an example of how we have been using downloadPage from
>twisted.web.client.  I have no problems getting the example to work when I
>make a simple app or write the code into the intrepeter.  But if I use it
>inside my app I get the user timeout below.
>Unhandled error in Deferred:
>Traceback (most recent call last):
>Failure: twisted.internet.error.TimeoutError: User timeout caused connection
>Am I forgetting something trivial?  The reactor is running as we use PB for
>database pooling.  Can I not call downloadPage after a reactor is setup and

Calling downloadPage after reactor.run is fine.  I'd take a look at DNS and
firewall settings for problems there.


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