Elixir stream to all subscribers

Question

I\'m trying to implement a radio server in Elixir

One process is always working and reading a file (mp3) and publish to topic \":radio\", currently for test purpose when

Answer 1

After a quick look I think there are 2 things you should fix:

1. PlugTest is a Plug so call/2 should return conn (that's not your issue though). It should also blocks while waiting for events (receive):

   def call(conn, _opts) do
     conn = conn
     |> send_chunked(200)
     |> put_resp_content_type("audio/mpeg")
   
     :ok = PubSub.subscribe(self(), :radio)
     send_chunk_to_connection(conn)
   end
   

2. In send_chunk_to_connection you should do:

   defp send_chunk_to_connection(conn) do
     receive do
       {:radio_data, data} ->
         case chunk(conn, data) do
           {:ok, conn} -> send_chunk_to_connection(conn)
           {:error, err} -> IO.puts err; conn # do nothing, as something went wrong (client disconnection or something else...)
         end
     end
   end