[tor-bugs] #18967 [Metrics/Onionoo]: Add UUID to families in Onionoo

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#18967: Add UUID to families in Onionoo
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     Reporter:  seansaito        |      Owner:
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Onionoo  |    Version:
     Severity:  Normal           |   Keywords:  persistence,
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 This is an enhancement of the implementation proposed in #16599.

 Some services that depend onOnionoorequire persistence in family data. For
 instance, some of the proposed features of Roster such as replacing Tor
 Weather require knowing when a certain relay goes down. Analogous to Tor
 spec proposal #242,Onionoo should implement such a scheme.

 Put simply, the implementation would be as follows:

  * Each family will have some UUID, which would be tagged on all member
 relays (like an extra fingerprint).
  * A new relay will be tagged by its family's UUID by looking up the ID of
 older relatives.
  * There are two schemes for storing key-value based data. One is for
 looking up families via UUID, the other for looking up a UUID via relay
 fingerprint.

 Unlike #16599, this implementation does not require any a priori
 information about the family. The UUIDs are guaranteed to be unique.
 Currently, Roster has a half-baked implementation of the above. Despite
 the simplicity of the implementation, the benefits are potentially great,
 as querying for and storing persistent data of families would become
 possible.

 [1] https://trac.torproject.org/projects/tor/ticket/16599

 [2] https://gitweb.torproject.org/torspec.git/tree/proposals/242-better-
 families.txt

 On uniqueness of UUIDs

 [3] https://stackoverflow.com/questions/703035/when-are-you-truly-forced-
 to-use-uuid-as-part-of-the-design/786541#786541

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18967>
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