[Twisted-Python] tor hidden service endpoint parser returns a deferred

[David Stainton]

Ah ha! Of course it is so obvious now that you point it out to me.
The onion endpoint parser can do this setup work in it's  `listen`
method which returns a `Deferred`.
Thanks for your observation/advice!

Cheers!

David

On Fri, May 2, 2014 at 3:01 PM,  <exarkun at twistedmatrix.com> wrote:
> On 02:53 pm, dstainton415 at gmail.com wrote:
>>
>> I get what you are saying... but let's back up a second;
>> foolscap (in my branch
>> https://github.com/david415/foolscap/tree/endpoint_descriptors_server2)
>> uses clientFromString and serverFromString to translate twisted
>> endpoint descriptors into endpoint objects... AND foolscap
>> doesn't know any details about how the endpoint wire protocols work...
>> and we'd like to keep it that way. That's really the point of this
>> exercise.
>>
>> The calling party using foolscap... in this case Tahoe-LAFS also
>> doesn't know anything about any wire protocols.
>> It simply receives twisted endpoint descriptors from the user and
>> passes them to foolscap.
>
>
> But Foolscap does know about *endpoints*.  It knows to call `listen` or
> `connect` on them.  Both of those methods return a `Deferred`.  Any setup
> work you need to do you should be able to do in the implementation of those
> methods and however long it takes is how long it takes - just don't fire the
> `Deferred` until it is ready.
>
> Jean-Paul
>
>
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