[tor-bugs] #3198 [Tor Bridge]: Try refetching bridge descriptors each second, not each ten seconds

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#3198: Try refetching bridge descriptors each second, not each ten seconds
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 Reporter:  arma        |          Owner:                    
     Type:  defect      |         Status:  new               
 Priority:  normal      |      Milestone:  Tor: 0.2.2.x-final
Component:  Tor Bridge  |        Version:                    
 Keywords:              |         Parent:                    
   Points:              |   Actualpoints:                    
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 Currently we only call fetch_bridge_descriptors() from main.c inside the
 "time_to_try_getting_descriptors < now" clause, which happens every 10 or
 60 seconds depending on whether we 'have enough dir info'.

 I think that schedule is fine for normal descriptors (because we're trying
 to batch requests), but I think for bridge descriptors we could retry
 every second without much harm and with some benefit.

 In particular, when we setconf a new bridge, we currently need to wait
 10ish or 60ish seconds before we'll even start its descriptor download
 (see #2355).

 I'd originally thought to call fetch_bridge_descriptors() from inside
 options_act() as a special case, but now I think we should just call it
 every second. (It looks through a smartlist, does a
 download_status_is_ready() check on each entry, and returns.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3198>
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