[tor-bugs] #27169 [Core Tor/Tor]: monitor bootstrap directory info progress separately

[Tor Bug Tracker & Wiki]

#27169: monitor bootstrap directory info progress separately
-------------------------+-------------------------------------------------
     Reporter:           |      Owner:  (none)
  catalyst               |
         Type:  task     |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  usability, ux, ux-team, bootstrap,
     Severity:  Normal   |  035-roadmap-subtask, 035-triaged-in-20180711,
                         |  s8-bootstrap
Actual Points:           |  Parent ID:  #27103
       Points:           |   Reviewer:
      Sponsor:           |
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 Abstract out the current monitoring of bootstrap directory information
 progress, so we can track it state more independently. This allows us to
 defer reporting that we have sufficient directory information until we
 know that we can actually connect to a relay or bridge at all.

 This also allows us to eliminate or simplify special case logic in
 `control_event_bootstrap()` that handles incremental progress during
 descriptor downloads.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27169>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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