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streamer.ex
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streamer.ex
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defmodule Pleroma.Web.Streamer do
use GenServer
require Logger
alias Pleroma.{User, Notification, Activity, Object}
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
Map.values(topics)
|> 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: :stream, topic: "direct", item: item}, topics) do
recipient_topics =
User.get_recipients_from_activity(item)
|> Enum.map(fn %{id: id} -> "direct:#{id}" end)
Enum.each(recipient_topics || [], fn user_topic ->
Logger.debug("Trying to push direct message to #{user_topic}\n\n")
push_to_socket(topics, user_topic, item)
end)
{:noreply, topics}
end
def handle_cast(%{action: :stream, topic: "list", item: item}, topics) do
recipient_topics =
Pleroma.List.get_lists_from_activity(item)
|> Enum.map(fn %{id: id} -> "list:#{id}" end)
Enum.each(recipient_topics || [], fn list_topic ->
Logger.debug("Trying to push message to #{list_topic}\n\n")
push_to_socket(topics, list_topic, item)
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
defp represent_update(%Activity{} = activity, %User{} = user) do
%{
event: "update",
payload:
Pleroma.Web.MastodonAPI.StatusView.render(
"status.json",
activity: activity,
for: user
)
|> Jason.encode!()
}
|> Jason.encode!()
end
def push_to_socket(topics, topic, %Activity{data: %{"type" => "Announce"}} = item) do
Enum.each(topics[topic] || [], fn socket ->
# Get the current user so we have up-to-date blocks etc.
user = User.get_cached_by_ap_id(socket.assigns[:user].ap_id)
blocks = user.info["blocks"] || []
parent = Object.normalize(item.data["object"])
unless is_nil(parent) or item.actor in blocks or parent.data["actor"] in blocks do
send(socket.transport_pid, {:text, represent_update(item, user)})
end
end)
end
def push_to_socket(topics, topic, item) do
Enum.each(topics[topic] || [], fn socket ->
# Get the current user so we have up-to-date blocks etc.
user = User.get_cached_by_ap_id(socket.assigns[:user].ap_id)
blocks = user.info["blocks"] || []
unless item.actor in blocks do
send(socket.transport_pid, {:text, represent_update(item, user)})
end
end)
end
defp internal_topic(topic, socket) when topic in ~w[user direct] do
"#{topic}:#{socket.assigns[:user].id}"
end
defp internal_topic(topic, _), do: topic
end

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streamer.ex (5 KB)

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