[tor-bugs] #28180 [Core Tor/Tor]: Signal mechanism from PT processes to Tor

[Tor Bug Tracker & Wiki]

#28180: Signal mechanism from PT processes to Tor
------------------------------+--------------------------------
     Reporter:  ahf           |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.6.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: unspecified
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #25502
       Points:                |   Reviewer:
      Sponsor:  Sponsor8      |
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 Once #28179 is done we now have bi-directional communication between the
 PT process and Tor itself.

 We need a method where a PT process can signal to Tor different events
 that has occurred. This could be things like "Unable to connect to
 {host}:{port}".

 Once we receive these messages from the PT we should expose them via the
 ControlPort for Tor Browser and friends to be able to act upon them.

 This ticket is a tracker ticket for all of this work. Ideally we need to
 figure out the right way to do this mechanism (is it an update to the PT
 spec?) and we might also want to update `goptlib` to support this feature
 to let PT developers use it right away.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28180>
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