distraction.party/lib/pleroma/web/streamer.ex

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defmodule Pleroma.Web.Streamer do
use GenServer
require Logger
alias Pleroma.{User, Notification}
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def start_link do
spawn(fn ->
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# 30 seconds
Process.sleep(1000 * 30)
GenServer.cast(__MODULE__, %{action: :ping})
end)
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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
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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)
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|> List.flatten()
|> Enum.each(fn socket ->
Logger.debug("Sending keepalive ping")
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send(socket.transport_pid, {:text, ""})
end)
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spawn(fn ->
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# 30 seconds
Process.sleep(1000 * 30)
GenServer.cast(__MODULE__, %{action: :ping})
end)
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{:noreply, topics}
end
def handle_cast(%{action: :stream, topic: "user", item: %Notification{} = item}, topics) do
topic = "user:#{item.user_id}"
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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)
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{:noreply, topics}
end
def handle_cast(%{action: :stream, topic: "user", item: item}, topics) do
Logger.debug("Trying to push to users")
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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)
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{: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)
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{:noreply, topics}
end
def handle_cast(%{action: :add, topic: topic, socket: socket}, sockets) do
topic = internal_topic(topic, socket)
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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
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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}
end
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def push_to_socket(topics, topic, item) do
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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})
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end)
end
defp internal_topic("user", socket) do
"user:#{socket.assigns[:user].id}"
end
defp internal_topic(topic, _), do: topic
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end