Redix.PubSub doesn't reconnect and die with error :closed

[fnicastri]

We use Redix.PubSub to subscribe a queue on a remote Redis server.
When the connection goes down most of the time Redix.PubSub die with :closed error.
In the same system we use Redix too to send messages to the same server, this process, on the contrary, reconnect without issues.

Using MONITOR we can see the "AUTH" messages on the server.

I can reproduce the error in a clean Phoenix project, you can find it here

Output

iex(1)> {:ok,rec}=Redix.PubSub.start_link([host: "localhost",password: "miTAhlInEWlI", debug: []])
{:ok, #PID<0.714.0>}
# after mocking a network loss
** (EXIT from #PID<0.696.0>) shell process exited with reason: :closed

system

• Erlang/OTP 26
• Elixir 1.16.2
• Redis 6.2.14
• Redix 1.5.0

also tested with

• Erlang/OTP 25
• Elixir 1.15.x
• Redix 1.2.x

[whatyouhide]

On the app that you shared (thanks for that by the way!), I do not see any logs like

** (EXIT from #PID<0.696.0>) shell process exited with reason: :closed

after running the redis-test.sh script.

[fnicastri]

It's not happening always at the first try, sometimes it works for a few cycles then it die.
Did you try to cycle the network a few times in a row?

[whatyouhide]

@fnicastri can you try the branch at #269 and see if it fixes it? I think this was actually a bug!

defp deps do
  [
    # ...
    {:redix, github: "whatyouhide/redix", branch: "al/fix-conn-errors-authing"}
  ]
end

[fnicastri]

@whatyouhide

Yes! it works!

Just a quick question: starting the Redix.PubSub directly from the Application Supervisor is the correct way, right?

Thank you

[whatyouhide]

starting the Redix.PubSub directly from the Application Supervisor is the correct way, right?

@fnicastri yes it is most likely, it depends on the use case but generally yes.

[fnicastri]

Thanks @whatyouhide!

I've been running a test for over an hour and it has never missed a reconnection.

[whatyouhide]

I released 1.5.1, thanks for reporting and fantastic catch. 💟

[fnicastri]

Thank you for the amazing work!