[tor-bugs] #31719 [Circumvention/Obfs4]: obfs4proxy should be more helpful if state file is empty

[Tor Bug Tracker & Wiki]

#31719: obfs4proxy should be more helpful if state file is empty
-------------------------------------+--------------------
     Reporter:  phw                  |      Owner:  (none)
         Type:  enhancement          |     Status:  new
     Priority:  Low                  |  Milestone:
    Component:  Circumvention/Obfs4  |    Version:
     Severity:  Minor                |   Keywords:  ux
Actual Points:                       |  Parent ID:  #30471
       Points:  0.5                  |   Reviewer:
      Sponsor:                       |
-------------------------------------+--------------------
 We had a user on IRC who ran into the following error message:
 {{{
 [warn] Server managed proxy encountered a method error. (obfs4 failed to
 load statefile '/var/db/tor/pt_state/obfs4_state.json': unexpected end of
 JSON input)
 }}}
 It turns out that the user's state file was empty. Removing the state file
 and then having obfs4proxy re-create it fixed the problem. Obfs4proxy
 should realise that the state file is empty (was opposed to corrupt) and
 either re-create it itself or advise the user to delete it and try again.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31719>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online