[tor-bugs] #10543 [Tor]: count_useable_descriptors behaves badly when nothing in ExitNodes has the Exit flag

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#10543: count_useable_descriptors behaves badly when nothing in ExitNodes has the
Exit flag
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     Reporter:  dhill   |      Owner:
         Type:  defect  |     Status:  needs_review
     Priority:  normal  |  Milestone:  Tor: 0.2.4.x-final
    Component:  Tor     |    Version:  Tor: 0.2.4.19
   Resolution:          |   Keywords:
Actual Points:          |  Parent ID:
       Points:          |
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Changes (by nickm):

 * status:  new => needs_review


Comment:

 Okay, I think that a good fix for this might look something like the one
 in branch bug10543 in my public repository.  I changed it so that if we
 have 0 candidate ExitNodes without the Exit flag, and we have some exits
 to consider, we look at non-reject* exit policies rather than at the Exit
 flag per se.

 Needs review.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10543#comment:2>
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