In twisted a polling loop usually translates into either a system of reactor.callLaters or a twisted.internet.task.LoopingCall.

Either like this this:

def __init__(self,oaf,interval=600):

self.interval=interval reactor.callLater(5,self.checkSystem)

def checkSystem(self): reactor.callLater(self.interval,self.checkSystem)

or like this:

def __init__(self,oaf,interval=600):

self.interval=interval task.LoopingCall(self.checkSystem).start(self.interval)

When I wrote what may be a similar system I actually set it up to refresh only when a client requested the output and the local copy was out of date, so you may actually prefer that approach.

-Andy Fundinger

On Sun, Jan 4, 2009 at 9:52 PM, Robert Hancock hancock.robert@gmail.comwrote:

I have a process that takes a list of URLs, uses client.getPage() to retrieve the data, writes the contents to disk, and then moves the file to another directory.

# get feed list - this is a list tuples # url, name, username, password url_tuples = feed_list(feed_file)

global C_URLS d = defer.succeed(log_start(log))

for tup_url in url_tuples: C_URLS += 1

   d.addCallback(get_page, tup_url)
   d.addErrback(get_page_error, tup_url[0])

   d.addCallback(page_to_file, tup_url)
   d.addErrback(page_to_file_error)

   d.addCallback(file_to_rsync_queue)
   d.addErrback(file_to_rsync_queue)

   d.addCallback(stop_working)
   #d.addErrback(self.gotError, (feed[0], 'while stopping'))

reactor.run()

I want to put this into a loop and run it as a daemon, but the looping is causing me a problem. I've tried making the above into a procedure (minus the stop working call back and reactor.run()) and it does not run. Any suggestions on how to encapsulate this into loop would be gratefully appreciated.

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