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state.ex
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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Streamer.State do
use GenServer
require Logger
alias Pleroma.Web.Streamer.StreamerSocket
@env Mix.env()
def start_link(_) do
GenServer.start_link(__MODULE__, %{sockets: %{}}, name: __MODULE__)
end
def add_socket(topic, socket) do
GenServer.call(__MODULE__, {:add, topic, socket})
end
def remove_socket(topic, socket) do
do_remove_socket(@env, topic, socket)
end
def get_sockets do
%{sockets: stream_sockets} = GenServer.call(__MODULE__, :get_state)
stream_sockets
end
def init(init_arg) do
{:ok, init_arg}
end
def handle_call(:get_state, _from, state) do
{:reply, state, state}
end
def handle_call({:add, topic, socket}, _from, %{sockets: sockets} = state) do
internal_topic = internal_topic(topic, socket)
stream_socket = StreamerSocket.from_socket(socket)
sockets_for_topic =
sockets
|> Map.get(internal_topic, [])
|> List.insert_at(0, stream_socket)
|> Enum.uniq()
state = put_in(state, [:sockets, internal_topic], sockets_for_topic)
Logger.debug("Got new conn for #{topic}")
{:reply, state, state}
end
def handle_call({:remove, topic, socket}, _from, %{sockets: sockets} = state) do
internal_topic = internal_topic(topic, socket)
stream_socket = StreamerSocket.from_socket(socket)
sockets_for_topic =
sockets
|> Map.get(internal_topic, [])
|> List.delete(stream_socket)
state = Kernel.put_in(state, [:sockets, internal_topic], sockets_for_topic)
{:reply, state, state}
end
defp do_remove_socket(:test, _, _) do
:ok
end
defp do_remove_socket(_env, topic, socket) do
GenServer.call(__MODULE__, {:remove, topic, socket})
end
defp internal_topic(topic, socket)
when topic in ~w[user user:notification direct] do
"#{topic}:#{socket.assigns[:user].id}"
end
defp internal_topic(topic, _) do
topic
end
end

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