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Eric Saxby
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Jun 10, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,43 +1,101 @@ | ||
| defmodule Playwright.Client.Transport.WebSocket do | ||
| @moduledoc false | ||
| use WebSockex | ||
| use GenServer | ||
| alias Playwright.Connection | ||
| require Logger | ||
|
|
||
| # API | ||
| # --------------------------------------------------------------------------- | ||
|
|
||
| defstruct(connection: nil) | ||
| defstruct([ | ||
| :connection, | ||
| :gun, | ||
| :gun_process_monitor, | ||
| :gun_stream_ref | ||
| ]) | ||
|
|
||
| def start_link([ws_endpoint, connection]) do | ||
| WebSockex.start_link(ws_endpoint, __MODULE__, %__MODULE__{connection: connection}, [ | ||
| {:socket_recv_timeout, 120_000} | ||
| ]) | ||
| GenServer.start_link(__MODULE__, [ws_endpoint, connection]) | ||
| end | ||
|
|
||
| def start_link!(args) do | ||
| {:ok, pid} = start_link(args) | ||
| pid | ||
| end | ||
|
|
||
| @impl GenServer | ||
| def init([ws_endpoint, connection]) do | ||
| uri = URI.parse(ws_endpoint) | ||
|
|
||
| with {:ok, gun_pid} <- :gun.open(to_charlist(uri.host), port(uri)), | ||
| {:ok, _protocol} <- :gun.await_up(gun_pid), | ||
| stream_ref <- :gun.ws_upgrade(gun_pid, uri.path), | ||
| :ok <- wait_for_ws_upgrade() do | ||
| ref = Process.monitor(gun_pid) | ||
|
|
||
| {:ok, | ||
| __struct__( | ||
| connection: connection, | ||
| gun: gun_pid, | ||
| gun_process_monitor: ref, | ||
| gun_stream_ref: stream_ref | ||
| )} | ||
| end | ||
| end | ||
|
|
||
| @spec send_message(pid(), binary()) :: :ok | ||
| def send_message(pid, message) do | ||
| WebSockex.send_frame(pid, {:text, message}) | ||
| GenServer.cast(pid, {:send_message, message}) | ||
| :ok | ||
| end | ||
|
|
||
| # @impl | ||
| # --------------------------------------------------------------------------- | ||
|
|
||
| @impl WebSockex | ||
| def handle_connect(_conn, state) do | ||
| {:ok, state} | ||
| @impl true | ||
| def handle_cast({:send_message, message}, state) do | ||
| :gun.ws_send(state.gun, {:text, message}) | ||
| {:noreply, state} | ||
| end | ||
|
|
||
| @impl true | ||
| def handle_info({:gun_ws, _gun_pid, _stream_ref, frame}, state) do | ||
| case frame do | ||
| {:text, data} -> | ||
| debug("frame: #{data}") | ||
| Connection.recv(state.connection, frame) | ||
| end | ||
| {:noreply, state} | ||
| end | ||
|
|
||
| @impl WebSockex | ||
| def handle_frame(frame, %{connection: connection} = state) do | ||
| {:text, data} = frame | ||
| Logger.debug("websocket frame: #{data}") | ||
| Connection.recv(connection, frame) | ||
| def handle_info({:DOWN, _ref, :process, pid, reason}, state) do | ||
| warn("Process went down: #{inspect(pid)}") | ||
| {:stop, reason, state} | ||
| end | ||
|
|
||
| defp port(%{port: port}) when not is_nil(port), do: port | ||
| defp port(%{scheme: "ws"}), do: 80 | ||
| defp port(%{scheme: "wss"}), do: 443 | ||
|
|
||
| defp transport(%{scheme: "wss"}), do: :http | ||
| defp transport(%{scheme: "ws"}), do: :http | ||
|
|
||
| {:ok, state} | ||
| defp wait_for_ws_upgrade do | ||
| receive do | ||
| {:gun_upgrade, _pid, _stream_ref, ["websocket"], _headers} -> | ||
| :ok | ||
|
|
||
| {:gun_response, _pid, _stream_ref, _, status, _headers} -> | ||
| {:error, status} | ||
|
|
||
| {:gun_error, _pid, _stream_ref, reason} -> | ||
| {:error, reason} | ||
| after | ||
| 1000 -> | ||
| exit(:timeout) | ||
| end | ||
| end | ||
|
|
||
| defp debug(msg), do: Logger.debug("[websocket@#{inspect(self())}] #{msg}") | ||
| defp warn(msg), do: Logger.warn("[websocket@#{inspect(self())}] #{msg}") | ||
| end |
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