[tor-bugs] #31648 [Core Tor/Tor]: Calculate responsible HSDirs for v3 descriptors in stem

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#31648: Calculate responsible HSDirs for v3 descriptors in stem
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     Reporter:  asn      |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: unspecified
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  tor-hs scaling onionbalance
     Severity:  Normal   |  network-team-roadmap-september tor-spec
Actual Points:           |  Parent ID:  #26768
       Points:  4        |   Reviewer:
      Sponsor:           |
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 The v3 HSPOST command will only post the current descriptor if we don't
 explicitly provide the HSDirs, but we also need to post the next
 descriptor from onionbalance.

 This means that we will need to compute the right HSDirs for both current
 and next descriptors from within stem.

 Furthermore, we will need to implement the whole time-period/SRV logic on
 the onionbalance side to know which time-period/SRV to use at any given
 time, and also when a new consensus arrives.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31648>
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