[tor-bugs] #28181 [Core Tor/Tor]: spec: Add to pt-spec.txt control messages going back to main process (tor)

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#28181: spec: Add to pt-spec.txt control messages going back to main process (tor)
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 Reporter:  dgoulet                              |          Owner:  dgoulet
     Type:  enhancement                          |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.6.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-spec, tor-pt, 036-roadmap-       |  Actual Points:
  subtask                                        |
Parent ID:  #28180                               |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor8
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Comment (by dgoulet):

 Thanks dcf1! That is very good feedback.

 What if instead we turn this around and keep the `EVENT` message idea so
 Tor can already start expecting such communication and future impl/spec
 will be able to use that to send anything back to Tor.

 But, we drop that `CONNECTION` event type that clearly doesn't work with
 all type of transport. Instead, we could have a simple `CONNECTIVITY` type
 which could report a binary state back to Tor saying "Ok I'm able to route
 traffic now as I connected to the endpoint and negotiated?".

 And we can also think that it could have an optional "ErrorMessage" in
 case it is a bad connectivity?

 Again, the goal here is to be able to make the PT tell Tor so Tor can tell
 the control port so ultimately Tor Browser can inform the user. Nothing
 more complicated for now.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28181#comment:5>
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