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