[Twisted-Python] Twisted & ZSI
Matthew Glubb
matt at zgroupplc.com
Wed May 23 09:55:14 EDT 2007
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Hi Thomas,
Thanks for your reply.
On 22 May 2007, at 19:22, Thomas Jacob wrote:
> Actually, I'm not using the built-in twisted dispatching system
> of ZSI myself, so you probably will have to read the source
> to find out these things :-)
Yes, I have been. With reference to deferreds, its not that
illuminating :( From my investigations, I am beginning to suspect
that whoever wrote the ZSI.twisted package overlooked the fact that
someone might want to defer a server's response to a SOAP call. The
callback handlers and chains may be disguising the use of deferreds
though as ZSI.twisted.WSresource.WSResource.render_POST does return
server.NOT_DONE_YET.
> Alternatively you might just want to try to ask that question again on
> pywebsvcs-talk at lists.sourceforge.net where the authors of ZSI post
> regularly, they are generally very helpful....
I'll do just that :)
> But it's also pretty easy to build your own ZSI/twisted dispatcher,
> that's
> what I am doing (executing the method calls in separate threads,
> handing
> deferred execution back the twisted reactor when I need deferreds,
> waiting on a lock till the results come in) , I could mail you a rough
> example if you like...
Yes, that makes sense. I'd really like to use twistd as the service
container rather than ZSI (I am just more familiar with twisted) if I
can but I might come sheepishly knocking at your door should I fail ;)
Regards
Matt
>
> On Tue, 2007-05-22 at 14:36 +0100, Matthew Glubb wrote:
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>> Hi All,
>>
>> Thanks again Thomas for pointing me in the right direction with
>> twisted and ZSI. I apologise if this is getting technically off-topic
>> (ie. ZSI) but people seem to get more annoyed about cross posting.
>> Berate me about that if it makes you feel better! If you still have
>> the patience, I have one major problem that is bugging me:
>>
>> At the moment, I have the following (test function) working fine
>> within twisted and twistd:
>>
>> def wsa_ProcessAip(self, ps, address, **kw):
>> self.request, self.response = CPServiceWSRF.wsa_ProcessAip(self,
>> ps, address, **kw)
>> self.response._mode = False
>> self.response._return = '127.0.0.1'
>> return self.request, self.response
>>
>> *However* I want to return a deferred from this method. I am not sure
>> that this is easily possible as ZSI doesn't seem to be recognising a
>> return value of either server.NOT_DONE_YET, or a deferred object. It
>> is also forcing me to return a tuple containing the ZSI request and
>> response objects which is confusing me as I want to return a
>> deferred. My ideal would be:
>>
>> def wsa_ProcessAip(self, ps, address, **kw):
>> self.request, self.response = CPServiceWSRF.wsa_ProcessAip(self,
>> ps, address, **kw)
>> # Don't worry about there being nothing to call back this
>> # In my reality it does get called back
>> deferred = defer.Deferred()
>> deferred.addBoth(self.aipBack)
>> return deferred
>>
>> def aipBack(self, result):
>> ip, mode = result
>> self.response._mode = mode
>> self.response._return = ip
>> return self.request, self.response
>>
>> Is this possible? Scanning the ZSI twisted package, the only mention
>> of a deferred object is in the client module. I am also puzzled with
>> the 'Delayed Call Sweep' debug line. To me, this indicates some kind
>> of deferred.
>>
>> Thanks a lot for your time :)
>>
>>
>> Matt
>>
>>
>> On 21 May 2007, at 17:49, Thomas Jacob wrote:
>>
>>> ZSI 2.0 has built-in twisted support...
>>>
>>> (see --twisted option for wsdl2py/dispatch)
>>>
>>> Client side usage:
>>>
>>> from MyService_services import *
>>>
>>> port = MyServiceLocator().getMyService("http://myhost/MyService")
>>> port.binding.defer = True
>>>
>>> msg = myMethodRequest()
>>> msg.value =...
>>> ...
>>> deferred = port.myMethod(msg)
>>> deferred.addCallback(....)
>>>
>>>
>>> Server side usage:
>>>
>>> Use twisted.web and derive a service class from WSResource:
>>>
>>> The following should get you started:
>>>
>>> http://proj.badc.rl.ac.uk/ndg/browser/TI12-security/trunk/python/
>>> ndg.security.server/ndg/security/server/SessionMgr/server-config.tac
>>>
>>>
>>> On Mon, 2007-05-21 at 15:43 +0100, Matthew Glubb wrote:
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>>>> Hi All,
>>>>
>>>> Apologies if this has been covered before but there seems to be a
>>>> dearth of documentation and examples on the net.
>>>>
>>>> Does anyone have any tips for integrating ZSI with twisted? I am
>>>> struggling with the concept of the request / response objects
>>>> and how
>>>> they relate to a twisted deferred object. Normally, under
>>>> twisted, I
>>>> would return a deferred from the SOAP method call and let the
>>>> reactor
>>>> take care of returning the response on callback/errback. How do
>>>> I do
>>>> this using ZSI?
>>>>
>>>> If anyone has got some *simple* example code, I'd love to see it. I
>>>> am not particularly concerned with general inter-operability, I am
>>>> more concerned with getting a particular SOAP client working
>>>> with my
>>>> application. SOAPpy doesn't seem to be cutting the mustard,
>>>> hence the
>>>> need to try ZSI.
>>>>
>>>> Any tips *gratefully* received :)
>>>>
>>>> Matt
>>>>
>>>>
>>>> m a t t h e w g l u b b
>>>>
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>>
>>
>> m a t t h e w g l u b b
>>
>> _____________________________________________________________________
>> ___
>> Z Group PLC
>>
>> Tel: +44 (0) 8700 111 173
>> Fax: +44 (0) 8707 051 393
>> Txt: +44 (0) 7800 140 877
>> Web: <http://www.zgroupplc.com/>
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m a t t h e w g l u b b
________________________________________________________________________
Z Group PLC
Tel: +44 (0) 8700 111 173
Fax: +44 (0) 8707 051 393
Txt: +44 (0) 7800 140 877
Web: <http://www.zgroupplc.com/>
This email and any files transmitted with it are confidential and
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addressed. The opinions expressed in this mail are those of the author
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