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defmodule Pleroma.Web.Streamer do
use GenServer
require Logger
alias Pleroma.{User, Notification}
def start_link do
spawn(fn ->
Process.sleep(1000 * 30) # 30 seconds
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
Map.values(topics)
|> List.flatten
|> Enum.each(fn (socket) ->
Logger.debug("Sending keepalive ping")
send socket.transport_pid, {:text, ""}
end)
spawn(fn ->
Process.sleep(1000 * 30) # 30 seconds
GenServer.cast(__MODULE__, %{action: :ping})
end)
{:noreply, topics}
end
def handle_cast(%{action: :stream, topic: "user", item: %Notification{} = item}, topics) do
topic = "user:#{item.user_id}"
Enum.each(topics[topic] || [], fn (socket) ->
json = %{
event: "notification",
payload: Pleroma.Web.MastodonAPI.MastodonAPIController.render_notification(socket.assigns["user"], item) |> Jason.encode!
} |> Jason.encode!
send socket.transport_pid, {:text, json}
end)
{:noreply, topics}
end
def handle_cast(%{action: :stream, topic: "user", item: item}, topics) do
Logger.debug("Trying to push to users")
recipient_topics = User.get_recipients_from_activity(item)
|> Enum.map(fn (%{id: id}) -> "user:#{id}" end)
Enum.each(recipient_topics, fn (topic) ->
push_to_socket(topics, topic, item)
end)
{:noreply, topics}
end
def handle_cast(%{action: :stream, topic: topic, item: item}, topics) do
Logger.debug("Trying to push to #{topic}")
Logger.debug("Pushing item to #{topic}")
push_to_socket(topics, topic, item)
{: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("Got new conn for #{topic}")
{: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("Removed conn for #{topic}")
{:noreply, sockets}
end
def handle_cast(m, state) do
Logger.info("Unknown: #{inspect(m)}, #{inspect(state)}")
{:noreply, state}
end
def push_to_socket(topics, topic, item) do
Enum.each(topics[topic] || [], fn (socket) ->
json = %{
event: "update",
payload: Pleroma.Web.MastodonAPI.StatusView.render("status.json", activity: item, for: socket.assigns[:user]) |> Jason.encode!
} |> Jason.encode!
send socket.transport_pid, {:text, json}
end)
end
defp internal_topic("user", socket) do
"user:#{socket.assigns[:user].id}"
end
defp internal_topic(topic, _), do: topic
end
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