[tor-bugs] #21856 [Core Tor/Tor]: prop224: Client introduction point failure cache

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#21856: prop224: Client introduction point failure cache
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     Reporter:  dgoulet        |      Owner:
         Type:  enhancement    |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: 0.3.2.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  tor-hs, prop224
Actual Points:                 |  Parent ID:  #17242
       Points:  2              |   Reviewer:
      Sponsor:  SponsorR-must  |
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 Implement the introduction point failure cache for proposal 224.

 This can be found in the legacy code in '''src/or/rendcache.c'''. See
 `strmap_t *rend_cache_failure` and functions starting with
 `rend_cache_failure_*`.

 We could re-use it but refactoring would be needed since some of the
 functions expects a `rend_service_descriptor_t` and they are indexed by
 `service_id` (onion address).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21856>
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