[tor-bugs] #25999 [Core Tor/Stem]: Build an abstraction layer over different consensus flavours

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#25999: Build an abstraction layer over different consensus flavours
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     Reporter:  teor           |      Owner:  atagar
         Type:  enhancement    |     Status:  new
     Priority:  Medium         |  Milestone:
    Component:  Core Tor/Stem  |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:
       Points:                 |   Reviewer:
      Sponsor:                 |
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 In #25979, there was a bug in sbws because the ns consensus flavour has
 exit policy summaries in the consensus, but the microdescriptor consensus
 has exit policy summaries in microdescriptors.

 The code to abstract over these differences is reasonably simple, but it's
 hard for people to read the specs, find out all the details, and implement
 it correctly.

 For an example, see:
 https://trac.torproject.org/projects/tor/ticket/25979#comment:4

 It would be great if Stem included an abstraction layer over the consensus
 and descriptors, and just returned the attribute regardless of where it
 came from. (Maybe we could include this code in Tor instead, but it would
 be a major effort.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25999>
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