[tor-bugs] #18852 [Core Tor/Tor]: Directory mirrors should check accounting usage more frequently

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#18852: Directory mirrors should check accounting usage more frequently
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     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.8.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.2.8.1-alpha
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #18616
       Points:                |   Reviewer:
      Sponsor:                |
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 After merging #12358 and #18616, Tor can wait up to 18 hours before
 checking whether the accounting usage has increase so much that we want to
 stop advertising DirPort and begindir support.

 This is not great for relays with daily accounting periods.

 I suggest we check every hour to see whether the result of
 router_should_be_directory_server() has changed. If so, we should
 mark_my_descriptor_dirty() with an appropriate message about deciding to
 advertise or stop advertising directory service support / DirPort.

 This likely also means separating the calculation part of
 router_should_be_directory_server() from the logging, otherwise we will
 log duplicate messages each time we change our minds about our accounting.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18852>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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