Error when recovering session from cookie when Heroku server is restarted

[jaimeiniesta]

Hello, I have a phoenix application with Openmaize 0.19, where users are logged in and remembered via a cookie. It works fine, but when I restart the Heroku server, it fails with this, and I need to delete my cookies to access the site.

2016-06-16T10:34:22.299967+00:00 heroku[web.1]: State changed from starting to up
2016-06-16T10:34:28.716619+00:00 heroku[router]: at=info method=GET path="/" host=example.com request_id=b0703eeb-21cd-4147-ad26-98a52d8f0c2f fwd="..." dyno=web.1 connect=0ms service=249ms status=500 bytes=295
2016-06-16T10:34:28.528526+00:00 app[web.1]: 10:34:28.528 request_id=b0703eeb-21cd-4147-ad26-98a52d8f0c2f [info] GET /
2016-06-16T10:34:28.721654+00:00 app[web.1]: 10:34:28.721 request_id=b0703eeb-21cd-4147-ad26-98a52d8f0c2f [info] Sent 500 in 192ms
2016-06-16T10:34:28.770918+00:00 app[web.1]: 10:34:28.770 [error] #PID<0.439.0> running MyApp.Endpoint terminated
2016-06-16T10:34:28.770930+00:00 app[web.1]: Server: example.com:80 (http)
2016-06-16T10:34:28.770939+00:00 app[web.1]: Request: GET /
2016-06-16T10:34:28.770940+00:00 app[web.1]: ** (exit) an exception was raised:
2016-06-16T10:34:28.770940+00:00 app[web.1]:     ** (ArgumentError) argument error
2016-06-16T10:34:28.770941+00:00 app[web.1]:         :erlang.binary_to_existing_atom("email", :utf8)
2016-06-16T10:34:28.770942+00:00 app[web.1]:         (poison) lib/poison/parser.ex:97: Poison.Parser.object_name/2
2016-06-16T10:34:28.770943+00:00 app[web.1]:         (poison) lib/poison/parser.ex:82: Poison.Parser.object_pairs/3
2016-06-16T10:34:28.770943+00:00 app[web.1]:         (poison) lib/poison/parser.ex:36: Poison.Parser.parse/2
2016-06-16T10:34:28.770944+00:00 app[web.1]:         (poison) lib/poison/parser.ex:50: Poison.Parser.parse!/2
2016-06-16T10:34:28.770944+00:00 app[web.1]:         (poison) lib/poison.ex:83: Poison.decode!/2
2016-06-16T10:34:28.770945+00:00 app[web.1]:         (elixir) lib/enum.ex:1088: Enum."-map/2-lists^map/1-0-"/2
2016-06-16T10:34:28.770946+00:00 app[web.1]:         (elixir) lib/enum.ex:1088: Enum."-map/2-lists^map/1-0-"/2

This already failed in 0.18, I mean, it does not seem related to the related changes about the "Remember me" feature.

[jaimeiniesta]

This does not fail in development, but when I restart my local server, the user is forgotten and is prompted to log in again.

[riverrun]

With the heroku error, does it happen every time you restart? With the user being forgotten after restarting, this is due to how the keys are generated (and then rotated). I want to improve this side of it, but I want to make sure that I'm doing it in a safe way - I obviously don't want the keys leaking. I'll look further into the heroku error, and I'm also working on the other error.

[riverrun]

I've just updated openmaize_jwt. Try mix deps.update openmaize_jwt - I think that will solve the heroku issue.

[jaimeiniesta]

Thanks, this fixes the Heroku error -- the user still needs to login after a restart of the server, but this is a separate issue.

Thanks!