mobilizon.chapril.org-mobil.../lib/service/streamer.ex

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defmodule Mobilizon.Service.Streamer do
@moduledoc """
# Streamer
Handles streaming activities
"""
use GenServer
require Logger
alias Mobilizon.Accounts.Actor
def init(args) do
{:ok, args}
end
def start_link do
spawn(fn ->
# 30 seconds
Process.sleep(1000 * 30)
GenServer.cast(__MODULE__, %{action: :ping})
end)
GenServer.start_link(__MODULE__, %{}, name: __MODULE__)
end
def add_socket(topic, socket) do
GenServer.cast(__MODULE__, %{action: :add, socket: socket, topic: topic})
end
def remove_socket(topic, socket) do
GenServer.cast(__MODULE__, %{action: :remove, socket: socket, topic: topic})
end
def stream(topic, item) do
GenServer.cast(__MODULE__, %{action: :stream, topic: topic, item: item})
end
def handle_cast(%{action: :ping}, topics) do
topics
|> Map.values()
|> List.flatten()
|> Enum.each(fn socket ->
Logger.debug("Sending keepalive ping")
send(socket.transport_pid, {:text, ""})
end)
spawn(fn ->
# 30 seconds
Process.sleep(1000 * 30)
GenServer.cast(__MODULE__, %{action: :ping})
end)
{:noreply, topics}
end
def handle_cast(%{action: :add, topic: topic, socket: socket}, sockets) do
topic = internal_topic(topic, socket)
sockets_for_topic = sockets[topic] || []
sockets_for_topic = Enum.uniq([socket | sockets_for_topic])
sockets = Map.put(sockets, topic, sockets_for_topic)
Logger.debug(fn ->
"Got new conn for #{topic}"
end)
{:noreply, sockets}
end
def handle_cast(%{action: :remove, topic: topic, socket: socket}, sockets) do
topic = internal_topic(topic, socket)
sockets_for_topic = sockets[topic] || []
sockets_for_topic = List.delete(sockets_for_topic, socket)
sockets = Map.put(sockets, topic, sockets_for_topic)
Logger.debug(fn ->
"Removed conn for #{topic}"
end)
{:noreply, sockets}
end
def handle_cast(m, state) do
Logger.info("Unknown: #{inspect(m)}, #{inspect(state)}")
{:noreply, state}
end
defp internal_topic("user", socket) do
"user:#{socket.assigns[:user].id}"
end
defp internal_topic(topic, _), do: topic
end