Ssl_closed error in GenServer

Phoenix Forum Questions / Help
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1

Hey all, I have an app running on elixir 1.8, Erlang 21 and Phoenix 1.3. It’s basically a dashboard which calls to different servers and gets some information from them, everything through a gen server. It’s been working well for at least a year, but now suddenly the application is breaking quite often and in the logs I can see the following error:
** (FunctionClauseError) no function clause matching in Dashboard.StatusServer.handle_info/2
Last message: {:ssl_closed, {:sslsocket, {:gen_tcp, #Port<0.122>, :tls_connection, :undefined}, [#PID<0.644.0>, #PID<0.643.0>]}}
(stdlib) gen_server.erl:637: :gen_server.try_dispatch/4 (stdlib) gen_server.erl:711: :gen_server.handle_msg/6 (stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3

I’ve been googling and thought it could be an issue with the HttpPoison version, I updated to the latest version (1.4) but I’m still having the same issue.

Do you have an idea what could be happening?

thanks

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2

Well, the main reason it’s failing is that it’s getting a message that it doesn’t have a pattern for. You could solve this by adding:

def handle_info({:ssl_closed, _}, state) do
  {:noreply, state}
end

The question remains of course why you’re getting that message. I’m not totally sure.

3

In case anybody gets here in the future, the issue seems to be due to hackney leaking messages: https://github.com/benoitc/hackney/issues/464

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