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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Integration.WebsocketClient do
@moduledoc """
A WebSocket client used to test Mastodon API streaming
Based on Phoenix Framework's WebsocketClient
https://github.com/phoenixframework/phoenix/blob/master/test/support/websocket_client.exs
"""
use GenServer
import Kernel, except: [send: 2]
defstruct [
:conn,
:request_ref,
:websocket,
:caller,
:status,
:resp_headers,
:sender,
closing?: false
]
@doc """
Starts the WebSocket client for given ws URL. `Phoenix.Socket.Message`s
received from the server are forwarded to the sender pid.
"""
def connect(sender, url, headers \\ []) do
with {:ok, socket} <- GenServer.start_link(__MODULE__, {sender}),
{:ok, :connected} <- GenServer.call(socket, {:connect, url, headers}) do
{:ok, socket}
end
end
@doc """
Closes the socket
"""
def close(socket) do
GenServer.cast(socket, :close)
end
@doc """
Sends a low-level text message to the client.
"""
def send_text(server_pid, msg) do
GenServer.call(server_pid, {:text, msg})
end
@doc false
def init({sender}) do
state = %__MODULE__{sender: sender}
{:ok, state}
end
@doc false
def handle_call({:connect, url, headers}, from, state) do
uri = URI.parse(url)
http_scheme =
case uri.scheme do
"ws" -> :http
"wss" -> :https
end
ws_scheme =
case uri.scheme do
"ws" -> :ws
"wss" -> :wss
end
path =
case uri.query do
nil -> uri.path
query -> uri.path <> "?" <> query
end
with {:ok, conn} <- Mint.HTTP.connect(http_scheme, uri.host, uri.port),
{:ok, conn, ref} <- Mint.WebSocket.upgrade(ws_scheme, conn, path, headers) do
state = %{state | conn: conn, request_ref: ref, caller: from}
{:noreply, state}
else
{:error, reason} ->
{:reply, {:error, reason}, state}
{:error, conn, reason} ->
{:reply, {:error, reason}, put_in(state.conn, conn)}
end
end
@doc false
def handle_info(message, state) do
case Mint.WebSocket.stream(state.conn, message) do
{:ok, conn, responses} ->
state = put_in(state.conn, conn) |> handle_responses(responses)
if state.closing?, do: do_close(state), else: {:noreply, state}
{:error, conn, reason, _responses} ->
state = put_in(state.conn, conn) |> reply({:error, reason})
{:noreply, state}
:unknown ->
{:noreply, state}
end
end
defp do_close(state) do
# Streaming a close frame may fail if the server has already closed
# for writing.
_ = stream_frame(state, :close)
Mint.HTTP.close(state.conn)
{:stop, :normal, state}
end
defp handle_responses(state, responses)
defp handle_responses(%{request_ref: ref} = state, [{:status, ref, status} | rest]) do
put_in(state.status, status)
|> handle_responses(rest)
end
defp handle_responses(%{request_ref: ref} = state, [{:headers, ref, resp_headers} | rest]) do
put_in(state.resp_headers, resp_headers)
|> handle_responses(rest)
end
defp handle_responses(%{request_ref: ref} = state, [{:done, ref} | rest]) do
case Mint.WebSocket.new(state.conn, ref, state.status, state.resp_headers) do
{:ok, conn, websocket} ->
%{state | conn: conn, websocket: websocket, status: nil, resp_headers: nil}
|> reply({:ok, :connected})
|> handle_responses(rest)
{:error, conn, reason} ->
put_in(state.conn, conn)
|> reply({:error, reason})
end
end
defp handle_responses(%{request_ref: ref, websocket: websocket} = state, [
{:data, ref, data} | rest
])
when websocket != nil do
case Mint.WebSocket.decode(websocket, data) do
{:ok, websocket, frames} ->
put_in(state.websocket, websocket)
|> handle_frames(frames)
|> handle_responses(rest)
{:error, websocket, reason} ->
put_in(state.websocket, websocket)
|> reply({:error, reason})
end
end
defp handle_responses(state, [_response | rest]) do
handle_responses(state, rest)
end
defp handle_responses(state, []), do: state
defp handle_frames(state, frames) do
{frames, state} =
Enum.flat_map_reduce(frames, state, fn
# prepare to close the connection when a close frame is received
{:close, _code, _data}, state ->
{[], put_in(state.closing?, true)}
frame, state ->
{[frame], state}
end)
Enum.each(frames, &Kernel.send(state.sender, &1))
state
end
defp reply(state, response) do
if state.caller, do: GenServer.reply(state.caller, response)
put_in(state.caller, nil)
end
# Encodes a frame as a binary and sends it along the wire, keeping `conn`
# and `websocket` up to date in `state`.
defp stream_frame(state, frame) do
with {:ok, websocket, data} <- Mint.WebSocket.encode(state.websocket, frame),
state = put_in(state.websocket, websocket),
{:ok, conn} <- Mint.WebSocket.stream_request_body(state.conn, state.request_ref, data) do
{:ok, put_in(state.conn, conn)}
else
{:error, %Mint.WebSocket{} = websocket, reason} ->
{:error, put_in(state.websocket, websocket), reason}
{:error, conn, reason} ->
{:error, put_in(state.conn, conn), reason}
end
end
end
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