[tor-bugs] #25852 [Core Tor/Tor]: GETINFO exit-policy for tor client should return 551

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#25852: GETINFO exit-policy for tor client should return 551
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 Reporter:  dmr                             |          Owner:  (none)
     Type:  defect                          |         Status:
                                            |  needs_revision
 Priority:  Medium                          |      Milestone:  Tor:
                                            |  0.3.4.x-final
Component:  Core Tor/Tor                    |        Version:
 Severity:  Normal                          |     Resolution:
 Keywords:  tor-spec, tor-client, fast-fix  |  Actual Points:
Parent ID:                                  |         Points:
 Reviewer:  dgoulet                         |        Sponsor:
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Comment (by atagar):

 Gotcha, thanks David. I'll leave this in your capable hands but for what
 it's worth the reason I bring this up is largely about cacheability. When
 'GETINFO exit-policy/full' returns something I can safely cache it
 until...

 a. A SETCONF changes our ExitPolicy.
 b. Our externally facing address changes.

 Tor provides events for those so once I get my hands on a policy I can
 skip future GETINFO calls (Nyx does a lot of this to lessen its load on
 tor).

 In the case of error responses I'm curious about cacheability too. In
 particular if it's transient (ie. I should retry) or not. Both the error
 cases above are less 'error' than 'no exit policy until X' so I can cache
 that. So if we can differentiate them from other (possibly transient)
 errors that would be helpful.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25852#comment:8>
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