[tor-bugs] #27100 [Core Tor/Tor]: report connection to PT SOCKS proxy separately from OR connection

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#27100: report connection to PT SOCKS proxy separately from OR connection
-------------------------------------------------+-------------------------
 Reporter:  catalyst                             |          Owner:  ahf
     Type:  enhancement                          |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.0.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  035-roadmap-subtask, 035-triaged-    |  Actual Points:
  in-20180711, socks, pt, s8-bootstrap           |
Parent ID:  #28018                               |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor8
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Comment (by catalyst):

 Proxy connections have their own small state machine, with the state
 variable in the `proxy_state` field of a `connection_t`.  Currently,
 connection.c changes that field directly.  If we wrap those state changes
 in a function, that function could publish notifications that we could
 then use in bootstrap reporting.  There aren't many states a proxy
 connection goes through during connection setup, but maybe it's still
 enough to improve the bootstrap UX.

 In terms of being comprehensible to a non-expert user, we might want to
 distinguish between firewall-bypass proxies and PT proxies.  (I'm still
 not completely sure how those compose together.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27100#comment:16>
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