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Websocket refactor to use Phoenix.Socket.Transport 

This will make us compatible with Cowboy and Bandit
This commit is contained in:
Mark Felder 2024-02-13 19:21:45 -05:00
parent 79d69ce72a
commit 64ad451a7b
4 changed files with 133 additions and 234 deletions
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9
config/config.exs
View File

@ -114,14 +114,7 @@
config :pleroma, Pleroma.Web.Endpoint,
url: [host: "localhost"],
http: [
ip: {127, 0, 0, 1},
dispatch: [
{:_,
[
{"/api/v1/streaming", Pleroma.Web.MastodonAPI.WebsocketHandler, []},
{:_, Plug.Cowboy.Handler, {Pleroma.Web.Endpoint, []}}
]}
]
ip: {127, 0, 0, 1}
],
protocol: "https",
secret_key_base: "aK4Abxf29xU9TTDKre9coZPUgevcVCFQJe/5xP/7Lt4BEif6idBIbjupVbOrbKxl",

93
lib/phoenix/transports/web_socket/raw.ex
View File

@ -1,93 +0,0 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Phoenix.Transports.WebSocket.Raw do
import Plug.Conn,
only: [
fetch_query_params: 1,
send_resp: 3
]
alias Phoenix.Socket.Transport
def default_config do
[
timeout: 60_000,
transport_log: false,
cowboy: Phoenix.Endpoint.CowboyWebSocket
]
end
def init(%Plug.Conn{method: "GET"} = conn, {endpoint, handler, transport}) do
{_, opts} = handler.__transport__(transport)
conn =
conn
|> fetch_query_params
|> Transport.transport_log(opts[:transport_log])
|> Transport.check_origin(handler, endpoint, opts)
case conn do
%{halted: false} = conn ->
case handler.connect(%{
endpoint: endpoint,
transport: transport,
options: [serializer: nil],
params: conn.params
}) do
{:ok, socket} ->
{:ok, conn, {__MODULE__, {socket, opts}}}
:error ->
send_resp(conn, :forbidden, "")
{:error, conn}
end
_ ->
{:error, conn}
end
end
def init(conn, _) do
send_resp(conn, :bad_request, "")
{:error, conn}
end
def ws_init({socket, config}) do
Process.flag(:trap_exit, true)
{:ok, %{socket: socket}, config[:timeout]}
end
def ws_handle(op, data, state) do
state.socket.handler
|> apply(:handle, [op, data, state])
|> case do
{op, data} ->
{:reply, {op, data}, state}
{op, data, state} ->
{:reply, {op, data}, state}
%{} = state ->
{:ok, state}
_ ->
{:ok, state}
end
end
def ws_info({_, _} = tuple, state) do
{:reply, tuple, state}
end
def ws_info(_tuple, state), do: {:ok, state}
def ws_close(state) do
ws_handle(:closed, :normal, state)
end
def ws_terminate(reason, state) do
ws_handle(:closed, reason, state)
end
end

9
lib/pleroma/web/endpoint.ex
View File

@ -9,6 +9,15 @@ defmodule Pleroma.Web.Endpoint do
alias Pleroma.Config
socket("/api/v1/streaming", Pleroma.Web.MastodonAPI.WebsocketHandler,
longpoll: false,
websocket: [
path: "/",
compress: false,
error_handler: {Pleroma.Web.MastodonAPI.WebsocketHandler, :handle_error, []}
]
)
socket("/socket", Pleroma.Web.UserSocket,
websocket: [
path: "/websocket",

218
lib/pleroma/web/mastodon_api/websocket_handler.ex
View File

@ -11,28 +11,21 @@ defmodule Pleroma.Web.MastodonAPI.WebsocketHandler do
alias Pleroma.Web.Streamer
alias Pleroma.Web.StreamerView
@behaviour :cowboy_websocket
@behaviour Phoenix.Socket.Transport
# Client ping period.
@tick :timer.seconds(30)
# Cowboy timeout period.
@timeout :timer.seconds(60)
# Hibernate every X messages
@hibernate_every 100
def init(%{qs: qs} = req, state) do
with params <- Enum.into(:cow_qs.parse_qs(qs), %{}),
sec_websocket <- :cowboy_req.header("sec-websocket-protocol", req, nil),
access_token <- Map.get(params, "access_token"),
{:ok, user, oauth_token} <- authenticate_request(access_token, sec_websocket),
{:ok, topic} <- Streamer.get_topic(params["stream"], user, oauth_token, params) do
req =
if sec_websocket do
:cowboy_req.set_resp_header("sec-websocket-protocol", sec_websocket, req)
else
req
end
@impl Phoenix.Socket.Transport
def child_spec(_opts), do: :ignore
# This only prepares the connection and is not in the process yet
@impl Phoenix.Socket.Transport
def connect(%{params: params} = transport_info) do
with access_token <- Map.get(params, "access_token"),
{:ok, user, oauth_token} <- authenticate_request(access_token),
{:ok, topic} <-
Streamer.get_topic(params["stream"], user, oauth_token, params) do
topics =
if topic do
[topic]
@ -40,41 +33,40 @@ def init(%{qs: qs} = req, state) do
[]
end
{:cowboy_websocket, req,
%{user: user, topics: topics, oauth_token: oauth_token, count: 0, timer: nil},
%{idle_timeout: @timeout}}
state = %{
user: user,
topics: topics,
oauth_token: oauth_token,
count: 0,
timer: nil
}
{:ok, state}
else
{:error, :bad_topic} ->
Logger.debug("#{__MODULE__} bad topic #{inspect(req)}")
req = :cowboy_req.reply(404, req)
{:ok, req, state}
Logger.debug("#{__MODULE__} bad topic #{inspect(transport_info)}")
{:error, :bad_topic}
{:error, :unauthorized} ->
Logger.debug("#{__MODULE__} authentication error: #{inspect(req)}")
req = :cowboy_req.reply(401, req)
{:ok, req, state}
Logger.debug("#{__MODULE__} authentication error: #{inspect(transport_info)}")
{:error, :unauthorized}
end
end
def websocket_init(state) do
Logger.debug(
"#{__MODULE__} accepted websocket connection for user #{(state.user || %{id: "anonymous"}).id}, topics #{state.topics}"
)
# All subscriptions/links and messages cannot be created
# until the processed is launched with init/1
@impl Phoenix.Socket.Transport
def init(state) do
Enum.each(state.topics, fn topic -> Streamer.add_socket(topic, state.oauth_token) end)
{:ok, %{state | timer: timer()}}
Process.send_after(self(), :ping, @tick)
{:ok, state}
end
# Client's Pong frame.
def websocket_handle(:pong, state) do
if state.timer, do: Process.cancel_timer(state.timer)
{:ok, %{state | timer: timer()}}
end
# We only receive pings for now
def websocket_handle(:ping, state), do: {:ok, state}
def websocket_handle({:text, text}, state) do
@impl Phoenix.Socket.Transport
def handle_in({text, [opcode: :text]}, state) do
with {:ok, %{} = event} <- Jason.decode(text) do
handle_client_event(event, state)
else
@ -84,50 +76,47 @@ def websocket_handle({:text, text}, state) do
end
end
def websocket_handle(frame, state) do
def handle_in(frame, state) do
Logger.error("#{__MODULE__} received frame: #{inspect(frame)}")
{:ok, state}
end
def websocket_info({:render_with_user, view, template, item, topic}, state) do
@impl Phoenix.Socket.Transport
def handle_info({:render_with_user, view, template, item, topic}, state) do
user = %User{} = User.get_cached_by_ap_id(state.user.ap_id)
unless Streamer.filtered_by_user?(user, item) do
websocket_info({:text, view.render(template, item, user, topic)}, %{state | user: user})
message = view.render(template, item, user, topic)
{:push, {:text, message}, %{state | user: user}}
else
{:ok, state}
end
end
def websocket_info({:text, message}, state) do
# If the websocket processed X messages, force an hibernate/GC.
# We don't hibernate at every message to balance CPU usage/latency with RAM usage.
if state.count > @hibernate_every do
{:reply, {:text, message}, %{state | count: 0}, :hibernate}
else
{:reply, {:text, message}, %{state | count: state.count + 1}}
end
def handle_info({:text, text}, state) do
{:push, {:text, text}, state}
end
# Ping tick. We don't re-queue a timer there, it is instead queued when :pong is received.
# As we hibernate there, reset the count to 0.
# If the client misses :pong, Cowboy will automatically timeout the connection after
# `@idle_timeout`.
def websocket_info(:tick, state) do
{:reply, :ping, %{state | timer: nil, count: 0}, :hibernate}
def handle_info(:ping, state) do
Process.send_after(self(), :ping, @tick)
{:push, {:ping, ""}, state}
end
def websocket_info(:close, state) do
{:stop, state}
def handle_info(:close, state) do
{:stop, {:closed, 'connection closed by server'}, state}
end
# State can be `[]` only in case we terminate before switching to websocket,
# we already log errors for these cases in `init/1`, so just do nothing here
def terminate(_reason, _req, []), do: :ok
def handle_info(msg, state) do
Logger.debug("#{__MODULE__} received info: #{inspect(msg)}")
def terminate(reason, _req, state) do
{:ok, state}
end
@impl Phoenix.Socket.Transport
def terminate(reason, state) do
Logger.debug(
"#{__MODULE__} terminating websocket connection for user #{(state.user || %{id: "anonymous"}).id}, topics #{state.topics || "?"}: #{inspect(reason)}"
"#{__MODULE__} terminating websocket connection for user #{(state.user || %{id: "anonymous"}).id}, topics #{state.topics || "?"}: #{inspect(reason)})"
)
Enum.each(state.topics, fn topic -> Streamer.remove_socket(topic) end)
@ -135,16 +124,13 @@ def terminate(reason, _req, state) do
end
# Public streams without authentication.
defp authenticate_request(nil, nil) do
defp authenticate_request(nil) do
{:ok, nil, nil}
end
# Authenticated streams.
defp authenticate_request(access_token, sec_websocket) do
token = access_token || sec_websocket
with true <- is_bitstring(token),
oauth_token = %Token{user_id: user_id} <- Repo.get_by(Token, token: token),
defp authenticate_request(access_token) do
with oauth_token = %Token{user_id: user_id} <- Repo.get_by(Token, token: access_token),
user = %User{} <- User.get_cached_by_id(user_id) do
{:ok, user, oauth_token}
else
@ -152,36 +138,32 @@ defp authenticate_request(access_token, sec_websocket) do
end
end
defp timer do
Process.send_after(self(), :tick, @tick)
end
defp handle_client_event(%{"type" => "subscribe", "stream" => _topic} = params, state) do
with {_, {:ok, topic}} <-
{:topic, Streamer.get_topic(params["stream"], state.user, state.oauth_token, params)},
{_, false} <- {:subscribed, topic in state.topics} do
Streamer.add_socket(topic, state.oauth_token)
{[
{:text,
StreamerView.render("pleroma_respond.json", %{type: "subscribe", result: "success"})}
], %{state | topics: [topic | state.topics]}}
message =
StreamerView.render("pleroma_respond.json", %{type: "subscribe", result: "success"})
{:reply, :ok, {:text, message}, %{state | topics: [topic | state.topics]}}
else
{:subscribed, true} ->
{[
{:text,
StreamerView.render("pleroma_respond.json", %{type: "subscribe", result: "ignored"})}
], state}
message =
StreamerView.render("pleroma_respond.json", %{type: "subscribe", result: "ignored"})
{:reply, :error, {:text, message}, state}
{:topic, {:error, error}} ->
{[
{:text,
message =
StreamerView.render("pleroma_respond.json", %{
type: "subscribe",
result: "error",
error: error
})}
], state}
})
{:reply, :error, {:text, message}, state}
end
end
@ -191,26 +173,26 @@ defp handle_client_event(%{"type" => "unsubscribe", "stream" => _topic} = params
{_, true} <- {:subscribed, topic in state.topics} do
Streamer.remove_socket(topic)
{[
{:text,
StreamerView.render("pleroma_respond.json", %{type: "unsubscribe", result: "success"})}
], %{state | topics: List.delete(state.topics, topic)}}
message =
StreamerView.render("pleroma_respond.json", %{type: "unsubscribe", result: "success"})
{:reply, :ok, {:text, message}, %{state | topics: List.delete(state.topics, topic)}}
else
{:subscribed, false} ->
{[
{:text,
StreamerView.render("pleroma_respond.json", %{type: "unsubscribe", result: "ignored"})}
], state}
message =
StreamerView.render("pleroma_respond.json", %{type: "unsubscribe", result: "ignored"})
{:reply, :error, {:text, message}, state}
{:topic, {:error, error}} ->
{[
{:text,
message =
StreamerView.render("pleroma_respond.json", %{
type: "unsubscribe",
result: "error",
error: error
})}
], state}
})
{:reply, :error, {:text, message}, state}
end
end
@ -219,39 +201,47 @@ defp handle_client_event(
state
) do
with {:auth, nil, nil} <- {:auth, state.user, state.oauth_token},
{:ok, user, oauth_token} <- authenticate_request(access_token, nil) do
{[
{:text,
{:ok, user, oauth_token} <- authenticate_request(access_token) do
message =
StreamerView.render("pleroma_respond.json", %{
type: "pleroma:authenticate",
result: "success"
})}
], %{state | user: user, oauth_token: oauth_token}}
})
{:reply, :ok, {:text, message}, %{state | user: user, oauth_token: oauth_token}}
else
{:auth, _, _} ->
{[
{:text,
message =
StreamerView.render("pleroma_respond.json", %{
type: "pleroma:authenticate",
result: "error",
error: :already_authenticated
})}
], state}
})
{:reply, :error, {:text, message}, state}
_ ->
{[
{:text,
message =
StreamerView.render("pleroma_respond.json", %{
type: "pleroma:authenticate",
result: "error",
error: :unauthorized
})}
], state}
})
{:reply, :error, {:text, message}, state}
end
end
defp handle_client_event(params, state) do
Logger.error("#{__MODULE__} received unknown event: #{inspect(params)}")
{[], state}
{:ok, state}
end
def handle_error(conn, :unauthorized) do
Plug.Conn.send_resp(conn, 401, "Unauthorized")
end
def handle_error(conn, _reason) do
Plug.Conn.send_resp(conn, 404, "Not Found")
end
end