[tor-bugs] #21651 [Core Tor/Tor]: prop140/compression: Refactor directory cache spooling code

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#21651: prop140/compression: Refactor directory cache spooling code
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     Reporter:  nickm         |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  TorCoreTeam201703
Actual Points:                |  Parent ID:
       Points:  3             |   Reviewer:
      Sponsor:  Sponsor4      |
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 Our current logic for spooling things from a directory server is a bit
 loopy.  Instead we should refactor it so that "things to be spooled" is a
 first-class object, with implementations depending on what we're spooling.
 This will make lots of our directory improvement stuff easier to
 implement.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21651>
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