CODEWITHSUNDEEP
websockettddelixir
Peter Saxton
Peter Saxton

Reputation: 4676

Opening a websocket connection to a local server

I am using the elixir-socket library. I would like to be able to connect to a test server running within the same erlang/elixir enviroment so I can test the messages sent. when I try to use the elixir socket to connect to localhost I get a non-existing domain error.

As an example I have a test that just prints messages a webserver receives to illustrate the point.

defmodule MyTest do
  use ExUnit.Case

  test "socket" do
    port = 9999
    SingleServer.start_link(port)
    :timer.sleep(2_000)
    socket = Socket.Web.connect! "0.0.0.0:#{port}"
    socket |> Socket.Web.send! { :text, "test" }
    :timer.sleep(2_000)
  end

end


defmodule SingleServer do
  def start_link(port) do
    spawn_link __MODULE__, :init, [port]
  end

  def init(port) do
    server = Socket.Web.listen! port
    client = server |> Socket.Web.accept!
    client = server |> Socket.Web.accept!
    client |> Socket.Web.recv! |> IO.inspect
  end
end

Upvotes: 3

Views: 1225

Answers (1)

Paweł Obrok
Paweł Obrok

Reputation: 23164

On the client side to connect to a host/port use either the two-argument connect! or connect! passing in a pair:

Socket.Web.connect!("localhost", port)
|> Socket.Web.send!({ :text, "test" })

On the server side somewhat counterintuitively accept! seems to be doing something different depending on if you pass it a server or a client socket. If you pass a server it waits for a client to connect and returns the client socket. If you pass the client socket it "accepts" the connection (as opposed to close!ing it), so the server side code should be something like:

server = Socket.Web.listen!(port)
client = Socket.Web.accept!(server)
Socket.Web.accept!(client)

client |> Socket.Web.recv! |> IO.inspect

Upvotes: 2

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