:fullsweep_after option is ignored

[zookzook]

Environment

• Elixir version (elixir -v): Elixir 1.15.4
• Phoenix version (mix deps): 1.6.16
• Operating system: Mac OS X

Actual behavior

From the documents, it is possible to set the :fullsweep_after option in the web sockets part of the endpoint configuration.

defmodule Web.Endpoint do
  use Phoenix.Endpoint, otp_app: :web
  
  socket "/socket", OnsenWeb.UserSocket,
    websocket: [fullsweep_after: 20],
    longpoll: false

It seems after using the WebSock package it does not work anymore.
See 623ea99

My workaround is to set the process flags right in the init/1 function of my user socket module like this:

defmodule Web.UserSocket do
  use Phoenix.Socket
  
  ...
  
  @impl true
  def init(state) do
    res = {:ok, {_, socket}} = super(state)
    :erlang.process_flag(:fullsweep_after, 20)
    res
  end

Expected behavior

Either the documentation must be adjusted, or the :fullsweep_after option must be reused in the code. By using the workaround I can verify that the value of the :fullsweep_after option changed to the desired value of the web socket process (initial call :cowboy_clear.connection_process/4).

[Gazler]

See the discussion here: elixir-plug/plug_cowboy#88 (comment)

and this commit: bf1f2bfc

I believe it should be handled by:

https://github.com/phoenixframework/websock_adapter/blob/cb18cce92a56fa16ec0cc1becccf196de5a27c58/lib/websock_adapter/cowboy_adapter.ex#L15
https://github.com/phoenixframework/websock_adapter/blob/cb18cce92a56fa16ec0cc1becccf196de5a27c58/lib/websock_adapter.ex#L69

But if not, then this could be a bug.

[zookzook]

Thank you for your fast response. I think I will update to the latest version first and try it again. I'm closing the issue.

[zookzook]

After updating Phoenix to the latest version it works as expected!