6 files changed, 218 insertions, 449 deletions

diff --git a/lib/pleroma/web/streamer/ping.ex b/lib/pleroma/web/streamer/ping.ex
deleted file mode 100644
index 7a08202a9..000000000
--- a/lib/pleroma/web/streamer/ping.ex
+++ /dev/null
@@ -1,37 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.Web.Streamer.Ping do
-  use GenServer
-  require Logger
-
-  alias Pleroma.Web.Streamer.State
-  alias Pleroma.Web.Streamer.StreamerSocket
-
-  @keepalive_interval :timer.seconds(30)
-
-  def start_link(opts) do
-    ping_interval = Keyword.get(opts, :ping_interval, @keepalive_interval)
-    GenServer.start_link(__MODULE__, %{ping_interval: ping_interval}, name: __MODULE__)
-  end
-
-  def init(%{ping_interval: ping_interval} = args) do
-    Process.send_after(self(), :ping, ping_interval)
-    {:ok, args}
-  end
-
-  def handle_info(:ping, %{ping_interval: ping_interval} = state) do
-    State.get_sockets()
-    |> Map.values()
-    |> List.flatten()
-    |> Enum.each(fn %StreamerSocket{transport_pid: transport_pid} ->
-      Logger.debug("Sending keepalive ping")
-      send(transport_pid, {:text, ""})
-    end)
-
-    Process.send_after(self(), :ping, ping_interval)
-
-    {:noreply, state}
-  end
-end
diff --git a/lib/pleroma/web/streamer/state.ex b/lib/pleroma/web/streamer/state.ex
deleted file mode 100644
index 4eb462a1a..000000000
--- a/lib/pleroma/web/streamer/state.ex
+++ /dev/null
@@ -1,71 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.Web.Streamer.State do
-  use GenServer
-  require Logger
-
-  alias Pleroma.Web.Streamer.StreamerSocket
-
-  @env Mix.env()
-
-  def start_link(_) do
-    GenServer.start_link(__MODULE__, %{sockets: %{}}, name: __MODULE__)
-  end
-
-  def add_socket(topic, socket) do
-    GenServer.call(__MODULE__, {:add, topic, socket})
-  end
-
-  def remove_socket(topic, socket) do
-    do_remove_socket(@env, topic, socket)
-  end
-
-  def get_sockets do
-    %{sockets: stream_sockets} = GenServer.call(__MODULE__, :get_state)
-    stream_sockets
-  end
-
-  def init(init_arg) do
-    {:ok, init_arg}
-  end
-
-  def handle_call(:get_state, _from, state) do
-    {:reply, state, state}
-  end
-
-  def handle_call({:add, topic, socket}, _from, %{sockets: sockets} = state) do
-    stream_socket = StreamerSocket.from_socket(socket)
-
-    sockets_for_topic =
-      sockets
-      |> Map.get(topic, [])
-      |> List.insert_at(0, stream_socket)
-      |> Enum.uniq()
-
-    state = put_in(state, [:sockets, topic], sockets_for_topic)
-    Logger.debug("Got new conn for #{topic}")
-    {:reply, state, state}
-  end
-
-  def handle_call({:remove, topic, socket}, _from, %{sockets: sockets} = state) do
-    stream_socket = StreamerSocket.from_socket(socket)
-
-    sockets_for_topic =
-      sockets
-      |> Map.get(topic, [])
-      |> List.delete(stream_socket)
-
-    state = Kernel.put_in(state, [:sockets, topic], sockets_for_topic)
-    {:reply, state, state}
-  end
-
-  defp do_remove_socket(:test, _, _) do
-    :ok
-  end
-
-  defp do_remove_socket(_env, topic, socket) do
-    GenServer.call(__MODULE__, {:remove, topic, socket})
-  end
-end
diff --git a/lib/pleroma/web/streamer/streamer.ex b/lib/pleroma/web/streamer/streamer.ex
index b7294d084..d1d70e556 100644
--- a/lib/pleroma/web/streamer/streamer.ex
+++ b/lib/pleroma/web/streamer/streamer.ex
@@ -3,33 +3,35 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.Streamer do
+  require Logger
+
+  alias Pleroma.Activity
+  alias Pleroma.Chat.MessageReference
+  alias Pleroma.Config
+  alias Pleroma.Conversation.Participation
+  alias Pleroma.Notification
+  alias Pleroma.Object
   alias Pleroma.User
-  alias Pleroma.Web.Streamer.State
-  alias Pleroma.Web.Streamer.Worker
+  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.ActivityPub.Visibility
+  alias Pleroma.Web.CommonAPI
+  alias Pleroma.Web.StreamerView
 
-  @timeout 60_000
   @mix_env Mix.env()
+  @registry Pleroma.Web.StreamerRegistry
+
+  def registry, do: @registry
 
   @public_streams ["public", "public:local", "public:media", "public:local:media"]
-  @user_streams ["user", "user:notification", "direct"]
+  @user_streams ["user", "user:notification", "direct", "user:pleroma_chat"]
 
   @doc "Expands and authorizes a stream, and registers the process for streaming."
-  @spec get_topic_and_add_socket(stream :: String.t(), State.t(), Map.t() | nil) ::
+  @spec get_topic_and_add_socket(stream :: String.t(), User.t() | nil, Map.t() | nil) ::
           {:ok, topic :: String.t()} | {:error, :bad_topic} | {:error, :unauthorized}
-  def get_topic_and_add_socket(stream, socket, params \\ %{}) do
-    user =
-      case socket do
-        %{assigns: %{user: user}} -> user
-        _ -> nil
-      end
-
+  def get_topic_and_add_socket(stream, user, params \\ %{}) do
     case get_topic(stream, user, params) do
-      {:ok, topic} ->
-        add_socket(topic, socket)
-        {:ok, topic}
-
-      error ->
-        error
+      {:ok, topic} -> add_socket(topic, user)
+      error -> error
     end
   end
 
@@ -74,47 +76,220 @@ defmodule Pleroma.Web.Streamer do
     {:error, :bad_topic}
   end
 
-  def add_socket(topic, socket) do
-    State.add_socket(topic, socket)
-  end
+  @doc "Registers the process for streaming. Use `get_topic/3` to get the full authorized topic."
+  def add_socket(topic, user) do
+    if should_env_send?() do
+      auth? = if user, do: true
+      Registry.register(@registry, topic, auth?)
+    end
 
-  def remove_socket(topic, socket) do
-    State.remove_socket(topic, socket)
+    {:ok, topic}
   end
 
-  def get_sockets do
-    State.get_sockets()
+  def remove_socket(topic) do
+    if should_env_send?(), do: Registry.unregister(@registry, topic)
   end
 
   def stream(topics, items) do
-    if should_send?() do
-      Task.async(fn ->
-        :poolboy.transaction(
-          :streamer_worker,
-          &Worker.stream(&1, topics, items),
-          @timeout
-        )
+    if should_env_send?() do
+      List.wrap(topics)
+      |> Enum.each(fn topic ->
+        List.wrap(items)
+        |> Enum.each(fn item ->
+          spawn(fn -> do_stream(topic, item) end)
+        end)
       end)
     end
+
+    :ok
+  end
+
+  def filtered_by_user?(user, item, streamed_type \\ :activity)
+
+  def filtered_by_user?(%User{} = user, %Activity{} = item, streamed_type) do
+    %{block: blocked_ap_ids, mute: muted_ap_ids, reblog_mute: reblog_muted_ap_ids} =
+      User.outgoing_relationships_ap_ids(user, [:block, :mute, :reblog_mute])
+
+    recipient_blocks = MapSet.new(blocked_ap_ids ++ muted_ap_ids)
+    recipients = MapSet.new(item.recipients)
+    domain_blocks = Pleroma.Web.ActivityPub.MRF.subdomains_regex(user.domain_blocks)
+
+    with parent <- Object.normalize(item) || item,
+         true <-
+           Enum.all?([blocked_ap_ids, muted_ap_ids], &(item.actor not in &1)),
+         true <- item.data["type"] != "Announce" || item.actor not in reblog_muted_ap_ids,
+         true <-
+           !(streamed_type == :activity && item.data["type"] == "Announce" &&
+               parent.data["actor"] == user.ap_id),
+         true <- Enum.all?([blocked_ap_ids, muted_ap_ids], &(parent.data["actor"] not in &1)),
+         true <- MapSet.disjoint?(recipients, recipient_blocks),
+         %{host: item_host} <- URI.parse(item.actor),
+         %{host: parent_host} <- URI.parse(parent.data["actor"]),
+         false <- Pleroma.Web.ActivityPub.MRF.subdomain_match?(domain_blocks, item_host),
+         false <- Pleroma.Web.ActivityPub.MRF.subdomain_match?(domain_blocks, parent_host),
+         true <- thread_containment(item, user),
+         false <- CommonAPI.thread_muted?(user, parent) do
+      false
+    else
+      _ -> true
+    end
   end
 
-  def supervisor, do: Pleroma.Web.Streamer.Supervisor
+  def filtered_by_user?(%User{} = user, %Notification{activity: activity}, _) do
+    filtered_by_user?(user, activity, :notification)
+  end
+
+  defp do_stream("direct", item) 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(user_topic, item)
+    end)
+  end
+
+  defp do_stream("participation", participation) do
+    user_topic = "direct:#{participation.user_id}"
+    Logger.debug("Trying to push a conversation participation to #{user_topic}\n\n")
+
+    push_to_socket(user_topic, participation)
+  end
+
+  defp do_stream("list", item) do
+    # filter the recipient list if the activity is not public, see #270.
+    recipient_lists =
+      case Visibility.is_public?(item) do
+        true ->
+          Pleroma.List.get_lists_from_activity(item)
 
-  defp should_send? do
-    handle_should_send(@mix_env)
+        _ ->
+          Pleroma.List.get_lists_from_activity(item)
+          |> Enum.filter(fn list ->
+            owner = User.get_cached_by_id(list.user_id)
+
+            Visibility.visible_for_user?(item, owner)
+          end)
+      end
+
+    recipient_topics =
+      recipient_lists
+      |> 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(list_topic, item)
+    end)
+  end
+
+  defp do_stream(topic, %Notification{} = item)
+       when topic in ["user", "user:notification"] do
+    Registry.dispatch(@registry, "#{topic}:#{item.user_id}", fn list ->
+      Enum.each(list, fn {pid, _auth} ->
+        send(pid, {:render_with_user, StreamerView, "notification.json", item})
+      end)
+    end)
   end
 
-  defp handle_should_send(:test) do
-    case Process.whereis(:streamer_worker) do
-      nil ->
-        false
+  defp do_stream(topic, {user, %MessageReference{} = cm_ref})
+       when topic in ["user", "user:pleroma_chat"] do
+    topic = "#{topic}:#{user.id}"
 
-      pid ->
-        Process.alive?(pid)
+    text = StreamerView.render("chat_update.json", %{chat_message_reference: cm_ref})
+
+    Registry.dispatch(@registry, topic, fn list ->
+      Enum.each(list, fn {pid, _auth} ->
+        send(pid, {:text, text})
+      end)
+    end)
+  end
+
+  defp do_stream("user", item) 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(topic, item)
+    end)
+  end
+
+  defp do_stream(topic, item) do
+    Logger.debug("Trying to push to #{topic}")
+    Logger.debug("Pushing item to #{topic}")
+    push_to_socket(topic, item)
+  end
+
+  defp push_to_socket(topic, %Participation{} = participation) do
+    rendered = StreamerView.render("conversation.json", participation)
+
+    Registry.dispatch(@registry, topic, fn list ->
+      Enum.each(list, fn {pid, _} ->
+        send(pid, {:text, rendered})
+      end)
+    end)
+  end
+
+  defp push_to_socket(topic, %Activity{
+         data: %{"type" => "Delete", "deleted_activity_id" => deleted_activity_id}
+       }) do
+    rendered = Jason.encode!(%{event: "delete", payload: to_string(deleted_activity_id)})
+
+    Registry.dispatch(@registry, topic, fn list ->
+      Enum.each(list, fn {pid, _} ->
+        send(pid, {:text, rendered})
+      end)
+    end)
+  end
+
+  defp push_to_socket(_topic, %Activity{data: %{"type" => "Delete"}}), do: :noop
+
+  defp push_to_socket(topic, item) do
+    anon_render = StreamerView.render("update.json", item)
+
+    Registry.dispatch(@registry, topic, fn list ->
+      Enum.each(list, fn {pid, auth?} ->
+        if auth? do
+          send(pid, {:render_with_user, StreamerView, "update.json", item})
+        else
+          send(pid, {:text, anon_render})
+        end
+      end)
+    end)
+  end
+
+  defp thread_containment(_activity, %User{skip_thread_containment: true}), do: true
+
+  defp thread_containment(activity, user) do
+    if Config.get([:instance, :skip_thread_containment]) do
+      true
+    else
+      ActivityPub.contain_activity(activity, user)
     end
   end
 
-  defp handle_should_send(:benchmark), do: false
+  # In test environement, only return true if the registry is started.
+  # In benchmark environment, returns false.
+  # In any other environment, always returns true.
+  cond do
+    @mix_env == :test ->
+      def should_env_send? do
+        case Process.whereis(@registry) do
+          nil ->
+            false
 
-  defp handle_should_send(_), do: true
+          pid ->
+            Process.alive?(pid)
+        end
+      end
+
+    @mix_env == :benchmark ->
+      def should_env_send?, do: false
+
+    true ->
+      def should_env_send?, do: true
+  end
 end
diff --git a/lib/pleroma/web/streamer/streamer_socket.ex b/lib/pleroma/web/streamer/streamer_socket.ex
deleted file mode 100644
index 7d5dcd34e..000000000
--- a/lib/pleroma/web/streamer/streamer_socket.ex
+++ /dev/null
@@ -1,35 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.Web.Streamer.StreamerSocket do
-  defstruct transport_pid: nil, user: nil
-
-  alias Pleroma.User
-  alias Pleroma.Web.Streamer.StreamerSocket
-
-  def from_socket(%{
-        transport_pid: transport_pid,
-        assigns: %{user: nil}
-      }) do
-    %StreamerSocket{
-      transport_pid: transport_pid
-    }
-  end
-
-  def from_socket(%{
-        transport_pid: transport_pid,
-        assigns: %{user: %User{} = user}
-      }) do
-    %StreamerSocket{
-      transport_pid: transport_pid,
-      user: user
-    }
-  end
-
-  def from_socket(%{transport_pid: transport_pid}) do
-    %StreamerSocket{
-      transport_pid: transport_pid
-    }
-  end
-end
diff --git a/lib/pleroma/web/streamer/supervisor.ex b/lib/pleroma/web/streamer/supervisor.ex
deleted file mode 100644
index bd9029bc0..000000000
--- a/lib/pleroma/web/streamer/supervisor.ex
+++ /dev/null
@@ -1,37 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.Web.Streamer.Supervisor do
-  use Supervisor
-
-  def start_link(opts) do
-    Supervisor.start_link(__MODULE__, opts, name: __MODULE__)
-  end
-
-  def init(args) do
-    children = [
-      {Pleroma.Web.Streamer.State, args},
-      {Pleroma.Web.Streamer.Ping, args},
-      :poolboy.child_spec(:streamer_worker, poolboy_config())
-    ]
-
-    opts = [strategy: :one_for_one, name: Pleroma.Web.Streamer.Supervisor]
-    Supervisor.init(children, opts)
-  end
-
-  defp poolboy_config do
-    opts =
-      Pleroma.Config.get(:streamer,
-        workers: 3,
-        overflow_workers: 2
-      )
-
-    [
-      {:name, {:local, :streamer_worker}},
-      {:worker_module, Pleroma.Web.Streamer.Worker},
-      {:size, opts[:workers]},
-      {:max_overflow, opts[:overflow_workers]}
-    ]
-  end
-end
diff --git a/lib/pleroma/web/streamer/worker.ex b/lib/pleroma/web/streamer/worker.ex
deleted file mode 100644
index c669e917d..000000000
--- a/lib/pleroma/web/streamer/worker.ex
+++ /dev/null
@@ -1,226 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.Web.Streamer.Worker do
-  use GenServer
-
-  require Logger
-
-  alias Pleroma.Activity
-  alias Pleroma.Config
-  alias Pleroma.Conversation.Participation
-  alias Pleroma.Notification
-  alias Pleroma.Object
-  alias Pleroma.User
-  alias Pleroma.Web.ActivityPub.ActivityPub
-  alias Pleroma.Web.ActivityPub.Visibility
-  alias Pleroma.Web.CommonAPI
-  alias Pleroma.Web.Streamer.State
-  alias Pleroma.Web.Streamer.StreamerSocket
-  alias Pleroma.Web.StreamerView
-
-  def start_link(_) do
-    GenServer.start_link(__MODULE__, %{}, [])
-  end
-
-  def init(init_arg) do
-    {:ok, init_arg}
-  end
-
-  def stream(pid, topics, items) do
-    GenServer.call(pid, {:stream, topics, items})
-  end
-
-  def handle_call({:stream, topics, item}, _from, state) when is_list(topics) do
-    Enum.each(topics, fn t ->
-      do_stream(%{topic: t, item: item})
-    end)
-
-    {:reply, state, state}
-  end
-
-  def handle_call({:stream, topic, items}, _from, state) when is_list(items) do
-    Enum.each(items, fn i ->
-      do_stream(%{topic: topic, item: i})
-    end)
-
-    {:reply, state, state}
-  end
-
-  def handle_call({:stream, topic, item}, _from, state) do
-    do_stream(%{topic: topic, item: item})
-
-    {:reply, state, state}
-  end
-
-  defp do_stream(%{topic: "direct", item: item}) 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(State.get_sockets(), user_topic, item)
-    end)
-  end
-
-  defp do_stream(%{topic: "participation", item: participation}) do
-    user_topic = "direct:#{participation.user_id}"
-    Logger.debug("Trying to push a conversation participation to #{user_topic}\n\n")
-
-    push_to_socket(State.get_sockets(), user_topic, participation)
-  end
-
-  defp do_stream(%{topic: "list", item: item}) do
-    # filter the recipient list if the activity is not public, see #270.
-    recipient_lists =
-      case Visibility.is_public?(item) do
-        true ->
-          Pleroma.List.get_lists_from_activity(item)
-
-        _ ->
-          Pleroma.List.get_lists_from_activity(item)
-          |> Enum.filter(fn list ->
-            owner = User.get_cached_by_id(list.user_id)
-
-            Visibility.visible_for_user?(item, owner)
-          end)
-      end
-
-    recipient_topics =
-      recipient_lists
-      |> 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(State.get_sockets(), list_topic, item)
-    end)
-  end
-
-  defp do_stream(%{topic: topic, item: %Notification{} = item})
-       when topic in ["user", "user:notification"] do
-    State.get_sockets()
-    |> Map.get("#{topic}:#{item.user_id}", [])
-    |> Enum.each(fn %StreamerSocket{transport_pid: transport_pid, user: socket_user} ->
-      with %User{} = user <- User.get_cached_by_ap_id(socket_user.ap_id),
-           true <- should_send?(user, item) do
-        send(transport_pid, {:text, StreamerView.render("notification.json", socket_user, item)})
-      end
-    end)
-  end
-
-  defp do_stream(%{topic: "user", item: item}) 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(State.get_sockets(), topic, item)
-    end)
-  end
-
-  defp do_stream(%{topic: topic, item: item}) do
-    Logger.debug("Trying to push to #{topic}")
-    Logger.debug("Pushing item to #{topic}")
-    push_to_socket(State.get_sockets(), topic, item)
-  end
-
-  defp should_send?(%User{} = user, %Activity{} = item) do
-    %{block: blocked_ap_ids, mute: muted_ap_ids, reblog_mute: reblog_muted_ap_ids} =
-      User.outgoing_relationships_ap_ids(user, [:block, :mute, :reblog_mute])
-
-    recipient_blocks = MapSet.new(blocked_ap_ids ++ muted_ap_ids)
-    recipients = MapSet.new(item.recipients)
-    domain_blocks = Pleroma.Web.ActivityPub.MRF.subdomains_regex(user.domain_blocks)
-
-    with parent <- Object.normalize(item) || item,
-         true <-
-           Enum.all?([blocked_ap_ids, muted_ap_ids], &(item.actor not in &1)),
-         true <- item.data["type"] != "Announce" || item.actor not in reblog_muted_ap_ids,
-         true <- Enum.all?([blocked_ap_ids, muted_ap_ids], &(parent.data["actor"] not in &1)),
-         true <- MapSet.disjoint?(recipients, recipient_blocks),
-         %{host: item_host} <- URI.parse(item.actor),
-         %{host: parent_host} <- URI.parse(parent.data["actor"]),
-         false <- Pleroma.Web.ActivityPub.MRF.subdomain_match?(domain_blocks, item_host),
-         false <- Pleroma.Web.ActivityPub.MRF.subdomain_match?(domain_blocks, parent_host),
-         true <- thread_containment(item, user),
-         false <- CommonAPI.thread_muted?(user, parent) do
-      true
-    else
-      _ -> false
-    end
-  end
-
-  defp should_send?(%User{} = user, %Notification{activity: activity}) do
-    should_send?(user, activity)
-  end
-
-  def push_to_socket(topics, topic, %Activity{data: %{"type" => "Announce"}} = item) do
-    Enum.each(topics[topic] || [], fn %StreamerSocket{
-                                        transport_pid: transport_pid,
-                                        user: socket_user
-                                      } ->
-      # Get the current user so we have up-to-date blocks etc.
-      if socket_user do
-        user = User.get_cached_by_ap_id(socket_user.ap_id)
-
-        if should_send?(user, item) do
-          send(transport_pid, {:text, StreamerView.render("update.json", item, user)})
-        end
-      else
-        send(transport_pid, {:text, StreamerView.render("update.json", item)})
-      end
-    end)
-  end
-
-  def push_to_socket(topics, topic, %Participation{} = participation) do
-    Enum.each(topics[topic] || [], fn %StreamerSocket{transport_pid: transport_pid} ->
-      send(transport_pid, {:text, StreamerView.render("conversation.json", participation)})
-    end)
-  end
-
-  def push_to_socket(topics, topic, %Activity{
-        data: %{"type" => "Delete", "deleted_activity_id" => deleted_activity_id}
-      }) do
-    Enum.each(topics[topic] || [], fn %StreamerSocket{transport_pid: transport_pid} ->
-      send(
-        transport_pid,
-        {:text, %{event: "delete", payload: to_string(deleted_activity_id)} |> Jason.encode!()}
-      )
-    end)
-  end
-
-  def push_to_socket(_topics, _topic, %Activity{data: %{"type" => "Delete"}}), do: :noop
-
-  def push_to_socket(topics, topic, item) do
-    Enum.each(topics[topic] || [], fn %StreamerSocket{
-                                        transport_pid: transport_pid,
-                                        user: socket_user
-                                      } ->
-      # Get the current user so we have up-to-date blocks etc.
-      if socket_user do
-        user = User.get_cached_by_ap_id(socket_user.ap_id)
-
-        if should_send?(user, item) do
-          send(transport_pid, {:text, StreamerView.render("update.json", item, user)})
-        end
-      else
-        send(transport_pid, {:text, StreamerView.render("update.json", item)})
-      end
-    end)
-  end
-
-  @spec thread_containment(Activity.t(), User.t()) :: boolean()
-  defp thread_containment(_activity, %User{skip_thread_containment: true}), do: true
-
-  defp thread_containment(activity, user) do
-    if Config.get([:instance, :skip_thread_containment]) do
-      true
-    else
-      ActivityPub.contain_activity(activity, user)
-    end
-  end
-end