[tor-bugs] #18859 [Core Tor]: A new SOCKS connection should use a pre-built circuit for its stream

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#18859: A new SOCKS connection should use a pre-built circuit for its stream
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     Reporter:  arthuredelstein  |      Owner:
         Type:  defect           |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Core Tor         |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 Since #3455, we use SOCKS auth isolation in Tor Browser to separate URL
 bar domains to different tor circuits. When the user browses to a new URL
 bar domain, a new SOCKS connection is opened with a SOCKS
 username/password unique to the site's domain.

 By telneting to the tor control port, I observed that immediately after I
 entered a new URL bar domain in a Tor Browser tab, a new circuit was built
 and assigned the SOCK_USERNAME and SOCKS_PASSWORD for that URL bar domain.

 It seems there would be better performance if we could use an existing,
 pre-built (yet-unused) circuit when a new SOCKS connection opens, and
 assign the SOCKS_USERNAME and SOCKS_PASSWORD to the pre-built circuit.
 That way the user wouldn't have to wait for a circuit to be established
 after requesting a new website.

 I don't know yet whether this is something that can be adjusted by config
 settings or if we would need to patch tor somehow.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18859>
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