[tor-bugs] #13699 [Tor]: Remove rend cache object if not usable anymore

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#13699: Remove rend cache object if not usable anymore
---------------------+---------------------
 Reporter:  dgoulet  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:
Component:  Tor      |        Version:
 Keywords:           |  Actual Points:
Parent ID:           |         Points:
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 This is a part of the larger bug #13644.

 A rend cache object is not really usable once the intro points list is
 empty. We should remove that object from the cache at that point and let
 the refetch v2 descriptor add back a new object.

 Right now, it's failing badly because the
 {{{rend_cache_store_v2_desc_as_client()}}} function is parsing everything
 from the reveiced descriptor but at the end validates that {{{desc}}} is
 the same and discard everything if true. That makes any cache object with
 no intro points left to stay in the cache until it expires.

 1) The store function should *not* be called if an object already exists.
 Once we trigger a refetch of the descriptor, we have to make sure the rend
 cache object has been removed before thus having the store function always
 adding new object.

 I'll push a branch to fix that in a jiffy.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13699>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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