[tor-bugs] #33666 [Circumvention/Snowflake]: Investigate Snowflake proxy failures

[Tor Bug Tracker & Wiki]

#33666: Investigate Snowflake proxy failures
-------------------------------------+------------------------------
 Reporter:  cohosh                   |          Owner:  cohosh
     Type:  defect                   |         Status:  needs_review
 Priority:  High                     |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:                           |  Actual Points:
Parent ID:  #19001                   |         Points:
 Reviewer:                           |        Sponsor:
-------------------------------------+------------------------------
Changes (by cohosh):

 * status:  assigned => needs_review


Comment:

 Okay this implements option 1.B by counting the number of successive
 failures. It slows the poll rate of the proxy if the failures pass the
 first threshold (5 in a row), and disables the proxy if it fails 15 times
 in a row. If the proxy succeeds, the fail count is reset and it goes back
 to polling at the starting rate.

 https://github.com/cohosh/snowflake/pull/25

 I'd like feedback on:
 - the plan to go with option 1.B
 - the values for the poll rates and thresholds
 - the method of using a fail count and resetting it. we can also keep
 track of a fail rate and reset it when we reset the stats.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33666#comment:17>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online