[tor-bugs] #19859 [Core Tor/Tor]: Expose stream isolation information to controllers

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#19859: Expose stream isolation information to controllers
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 Reporter:  nickm                                |          Owner:  (none)
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.3.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-hs tor-control dns isolation     |  Actual Points:
  needs-spec needs-design term-project           |
Parent ID:                                       |         Points:  3
 Reviewer:  nickm                                |        Sponsor:
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Comment (by nickm):

 Thanks for the patch!  Before I get too deep into the code, I'll review
 the spec.

 It would be good if the programmer who uses this feature doesn't need to
 know in advance a complete list of all the different things that can be
 isolated.  So for example, if we later add isolation based on source port,
 or isolation based on destination address or TLD, it would be good if the
 programmer doesn't need to change their code accordingly.

 So what if, instead of having a bunch of different `ISOLATE_XYZ` flags, we
 have one item that is a comma-separated list of `entries` flags, each
 matching the name of one of the other fields?

 Also, I suggest that we mark all of these fields as optional, since older
 Tors will not provide them, and not all protocols necessarily have them.

 Finally, the list of ClientProtocol values should mention that they can be
 extended in the future.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19859#comment:13>
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