This is an example of using GenStage to have a Hound producer/consumer, but the same thing can be done with just a GenServer

hound-stage-example.ex

defmodule ExampleChecker do
  use Hound.Helpers
  use GenStage

  def start_link(arg \\ []),
    do: GenStage.start_link(__MODULE__, arg, [])

  def init(_) do
    try do
      session_id = Hound.start_session()
      navigate_to "http://example.com/" # go somewhere to make chrome fully awake
      {:producer_consumer, %{session_id: session_id}}
    rescue
      error ->
        {:error, error}
    end
  end

  def handle_cast(:shutdown, state), do: {:stop, :exception, state}

  def handle_events(events, _from, state) do
    {:noreply, Enum.map(events, &safe_check/1), state}
  end

  def terminate(reason, state) do
    Hound.end_session(self())
    super(reason, state)
  end

  def safe_check(args) do
    try do
      check(args)
    rescue
      error ->
        GenStage.cast(self(), :shutdown)
        {:error, {:exception, error}, email}
    end
  end

  def check(_args) do
    # result = do_something(args)
    # {:ok, result}
  end
end