[Twisted-Python] Asynchronously initializing objects in twisted.web?

Wed Sep 9 01:27:46 MDT 2015

Ah, I was under the impression that listenTCP() can only be called 
before reactor.run().
I don't now where it came from.

Thanks,

On 09/08/15 20:41, Alexey Panyovin wrote:
> from twisted.webimport server, resource
> from twisted.internetimport reactor, defer
>
> class Simple(resource.Resource):
>      isLeaf =True def render_GET(self, request):
>          return "<html>Hello, world!</html>" def call_me():
>      d = defer.Deferred()
>      print "Get something" d.callback("success")
>      return d
>
> def run_web(_):
>      print "run_web" site = server.Site(Simple())
>      reactor.listenTCP(8080, site)
>
> d = call_me()
> d.addCallback(run_web)
> reactor.run()
>
> --
> Alex
>
> 08.09.15 17:51, Nagy, Attila пишет:
>> Hi,
>>
>> I wonder, if I have this example program:
>> https://twistedmatrix.com/documents/current/web/howto/using-twistedweb.html#site-objects 
>>
>>
>> how do I initialize an external resource (like a dictionary, which is 
>> fetched from a database) with asynchronous twisted tools, but before 
>> the HTTP server starts listening on its port?
>> The goal here is that the HTTP server shouldn't start until it can 
>> fetch the desired data. Of course I can do this in a synchronous way, 
>> but it feels so unnatural and bad practice to fetch the same stuff 
>> synchronously on initialization and asynchronously when the 
>> program/reactor is running (often with different libraries).
>>
>> Thanks,
>>
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>
>
>
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