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Re: [tor-bugs] #14847 [Tor]: Controller: add a command to fetch HS descriptor from HSdir(s)

#14847: Controller: add a command to fetch HS descriptor from HSdir(s)
-----------------------------+----------------------------------------
     Reporter:  dgoulet      |      Owner:  dgoulet
         Type:  enhancement  |     Status:  needs_review
     Priority:  normal       |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor          |    Version:
   Resolution:               |   Keywords:  SponsorR tor-hs controller
Actual Points:               |  Parent ID:  #3521
       Points:               |
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Comment (by atagar):

 > That's exactly what we've been heading away from with the async
 approach.

 Present world for descriptor fetching is...

  * Controllers can make a simple, synchronous request to read cached
 descriptors.
  * Scripts can contact a dirauth's DirPort to actively fetch the fresh
 thing.

 This is nice. It means scripts can piggyback on a cache or download what
 they need, and in either case it's simple and synchronous.

 If we go with an asynchronous approach the first method people will want
 is a simple blocking 'I want a hidden service descriptor, give it to me'
 method. If it doesn't live in tor it'll be in stem and that's fine. We
 already do something similar with creating circuits - tor doesn't provide
 a blocking method so stem adds a listener and waits for the event
 indicating that it's done...

   https://gitweb.torproject.org/stem.git/tree/stem/control.py#n2705

 Just makes for a more interesting dance on my end.

 Please be very, very careful though that a HSDESC is **always** emitted,
 1:1, with a call of this method. If there's any use case where the
 controller doesn't get either a success or failure message it'll be left
 hanging indefinitely.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14847#comment:13>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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