[Twisted-Python] adbapi weirdness

Steve Freitas sflist at ihonk.com
Thu Jul 31 00:13:05 EDT 2003

Hi all,

Here's the latest thing I can't figure out.

If I do this and make an XML-RPC call to dbtest(), it runs fine:

class takeOne(xmlrpc.XMLRPC):
    def __init__(self):
        self.dbpool = adbapi.ConnectionPool("pyPgSQL.PgSQL", \
		host='', user='postgres', database='template1')
        self.db = adbapi.Augmentation(self.dbpool)
	self.prefs = Env(self.db)

    def xmlrpc_dbtest(self):
        result = self.db.runQuery("select * from prefs")
        return result

    def xmlrpc_listPrefs(self):
        return self.prefs.prefs

class Env:
    def __init__(self, db):
        self.db = db
        self.prefs = self.db.runQuery("select * from prefs")

def main():
    from twisted.internet.app import Application
    app = Application("xmlrpc")
    r = takeOne()
    app.listenTCP(7080, server.Site(r))
    return app

application = main()

if __name__ == '__main__':

But a call to listPrefs() hangs until I make another, concurrent request to 
dbtest(), at which point it comes through. Then if I try listPrefs() again, 
it returns Fault 8002: Can't serialize output.

Any ideas? I'm suffering from all kinds of this weirdness: It hangs, then it 
doesn't hang, then it returns properly, then it can't serialize from the same 
function that worked a moment before. :-(



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