13 files changed, 590 insertions, 362 deletions
diff --git a/lib/pleroma/activity/ir/topics.ex b/lib/pleroma/activity/ir/topics.ex
new file mode 100644
index 000000000..010897abc
--- /dev/null
+++ b/lib/pleroma/activity/ir/topics.ex
@@ -0,0 +1,63 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Activity.Ir.Topics do
+  alias Pleroma.Object
+  alias Pleroma.Web.ActivityPub.Visibility
+
+  def get_activity_topics(activity) do
+    activity
+    |> Object.normalize()
+    |> generate_topics(activity)
+    |> List.flatten()
+  end
+
+  defp generate_topics(%{data: %{"type" => "Answer"}}, _) do
+    []
+  end
+
+  defp generate_topics(object, activity) do
+    ["user", "list"] ++ visibility_tags(object, activity)
+  end
+
+  defp visibility_tags(object, activity) do
+    case Visibility.get_visibility(activity) do
+      "public" ->
+        if activity.local do
+          ["public", "public:local"]
+        else
+          ["public"]
+        end
+        |> item_creation_tags(object, activity)
+
+      "direct" ->
+        ["direct"]
+
+      _ ->
+        []
+    end
+  end
+
+  defp item_creation_tags(tags, %{data: %{"type" => "Create"}} = object, activity) do
+    tags ++ hashtags_to_topics(object) ++ attachment_topics(object, activity)
+  end
+
+  defp item_creation_tags(tags, _, _) do
+    tags
+  end
+
+  defp hashtags_to_topics(%{data: %{"tag" => tags}}) do
+    tags
+    |> Enum.filter(&is_bitstring(&1))
+    |> Enum.map(fn tag -> "hashtag:" <> tag end)
+  end
+
+  defp hashtags_to_topics(_), do: []
+
+  defp attachment_topics(%{data: %{"attachment" => []}}, _act), do: []
+
+  defp attachment_topics(_object, %{local: true}), do: ["public:media", "public:local:media"]
+
+  defp attachment_topics(_object, _act), do: ["public:media"]
+end
diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex
index 49094704b..3b37ce630 100644
--- a/lib/pleroma/application.ex
+++ b/lib/pleroma/application.ex
@@ -141,7 +141,7 @@ defmodule Pleroma.Application do
   defp streamer_child(:test), do: []
 
   defp streamer_child(_) do
-    [Pleroma.Web.Streamer]
+    [Pleroma.Web.Streamer.supervisor()]
   end
 
   defp oauth_cleanup_child(true),
diff --git a/lib/pleroma/notification.ex b/lib/pleroma/notification.ex
index b7c880c51..8012389ac 100644
--- a/lib/pleroma/notification.ex
+++ b/lib/pleroma/notification.ex
@@ -210,8 +210,10 @@ defmodule Pleroma.Notification do
     unless skip?(activity, user) do
       notification = %Notification{user_id: user.id, activity: activity}
       {:ok, notification} = Repo.insert(notification)
-      Streamer.stream("user", notification)
-      Streamer.stream("user:notification", notification)
+
+      ["user", "user:notification"]
+      |> Streamer.stream(notification)
+
       Push.send(notification)
       notification
     end
diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 41f6a0f1f..bc5ae7fbf 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -4,6 +4,7 @@
 
 defmodule Pleroma.Web.ActivityPub.ActivityPub do
   alias Pleroma.Activity
+  alias Pleroma.Activity.Ir.Topics
   alias Pleroma.Config
   alias Pleroma.Conversation
   alias Pleroma.Notification
@@ -16,6 +17,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
   alias Pleroma.User
   alias Pleroma.Web.ActivityPub.MRF
   alias Pleroma.Web.ActivityPub.Transmogrifier
+  alias Pleroma.Web.Streamer
   alias Pleroma.Web.WebFinger
   alias Pleroma.Workers.BackgroundWorker
 
@@ -187,9 +189,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
       participations
       |> Repo.preload(:user)
 
-    Enum.each(participations, fn participation ->
-      Pleroma.Web.Streamer.stream("participation", participation)
-    end)
+    Streamer.stream("participation", participations)
   end
 
   def stream_out_participations(%Object{data: %{"context" => context}}, user) do
@@ -208,41 +208,15 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
 
   def stream_out_participations(_, _), do: :noop
 
-  def stream_out(activity) do
-    if activity.data["type"] in ["Create", "Announce", "Delete"] do
-      object = Object.normalize(activity)
-      # Do not stream out poll replies
-      unless object.data["type"] == "Answer" do
-        Pleroma.Web.Streamer.stream("user", activity)
-        Pleroma.Web.Streamer.stream("list", activity)
-
-        if get_visibility(activity) == "public" do
-          Pleroma.Web.Streamer.stream("public", activity)
-
-          if activity.local do
-            Pleroma.Web.Streamer.stream("public:local", activity)
-          end
-
-          if activity.data["type"] in ["Create"] do
-            object.data
-            |> Map.get("tag", [])
-            |> Enum.filter(fn tag -> is_bitstring(tag) end)
-            |> Enum.each(fn tag -> Pleroma.Web.Streamer.stream("hashtag:" <> tag, activity) end)
-
-            if object.data["attachment"] != [] do
-              Pleroma.Web.Streamer.stream("public:media", activity)
-
-              if activity.local do
-                Pleroma.Web.Streamer.stream("public:local:media", activity)
-              end
-            end
-          end
-        else
-          if get_visibility(activity) == "direct",
-            do: Pleroma.Web.Streamer.stream("direct", activity)
-        end
-      end
-    end
+  def stream_out(%Activity{data: %{"type" => data_type}} = activity)
+      when data_type in ["Create", "Announce", "Delete"] do
+    activity
+    |> Topics.get_activity_topics()
+    |> Streamer.stream(activity)
+  end
+
+  def stream_out(_activity) do
+    :noop
   end
 
   def create(%{to: to, actor: actor, context: context, object: object} = params, fake \\ false) do
diff --git a/lib/pleroma/web/mastodon_api/websocket_handler.ex b/lib/pleroma/web/mastodon_api/websocket_handler.ex
index dbd3542ea..3c26eb406 100644
--- a/lib/pleroma/web/mastodon_api/websocket_handler.ex
+++ b/lib/pleroma/web/mastodon_api/websocket_handler.ex
@@ -8,6 +8,7 @@ defmodule Pleroma.Web.MastodonAPI.WebsocketHandler do
   alias Pleroma.Repo
   alias Pleroma.User
   alias Pleroma.Web.OAuth.Token
+  alias Pleroma.Web.Streamer
 
   @behaviour :cowboy_websocket
 
@@ -24,7 +25,7 @@ defmodule Pleroma.Web.MastodonAPI.WebsocketHandler do
   ]
   @anonymous_streams ["public", "public:local", "hashtag"]
 
-  # Handled by periodic keepalive in Pleroma.Web.Streamer.
+  # Handled by periodic keepalive in Pleroma.Web.Streamer.Ping.
   @timeout :infinity
 
   def init(%{qs: qs} = req, state) do
@@ -65,7 +66,7 @@ defmodule Pleroma.Web.MastodonAPI.WebsocketHandler do
       }, topic #{state.topic}"
     )
 
-    Pleroma.Web.Streamer.add_socket(state.topic, streamer_socket(state))
+    Streamer.add_socket(state.topic, streamer_socket(state))
     {:ok, state}
   end
 
@@ -80,7 +81,7 @@ defmodule Pleroma.Web.MastodonAPI.WebsocketHandler do
       }, topic #{state.topic || "?"}: #{inspect(reason)}"
     )
 
-    Pleroma.Web.Streamer.remove_socket(state.topic, streamer_socket(state))
+    Streamer.remove_socket(state.topic, streamer_socket(state))
     :ok
   end
 
diff --git a/lib/pleroma/web/streamer.ex b/lib/pleroma/web/streamer.ex
deleted file mode 100644
index 587c43f40..000000000
--- a/lib/pleroma/web/streamer.ex
+++ /dev/null
@@ -1,318 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.Web.Streamer 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.MastodonAPI.NotificationView
-
-  @keepalive_interval :timer.seconds(30)
-
-  def start_link(_) do
-    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 init(args) do
-    Process.send_after(self(), %{action: :ping}, @keepalive_interval)
-
-    {:ok, args}
-  end
-
-  def handle_info(%{action: :ping}, topics) do
-    topics
-    |> Map.values()
-    |> List.flatten()
-    |> Enum.each(fn socket ->
-      Logger.debug("Sending keepalive ping")
-      send(socket.transport_pid, {:text, ""})
-    end)
-
-    Process.send_after(self(), %{action: :ping}, @keepalive_interval)
-
-    {: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: "participation", item: participation}, topics) do
-    user_topic = "direct:#{participation.user_id}"
-    Logger.debug("Trying to push a conversation participation to #{user_topic}\n\n")
-
-    push_to_socket(topics, user_topic, participation)
-
-    {:noreply, topics}
-  end
-
-  def handle_cast(%{action: :stream, topic: "list", item: item}, topics) 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(topics, list_topic, item)
-    end)
-
-    {:noreply, topics}
-  end
-
-  def handle_cast(
-        %{action: :stream, topic: topic, item: %Notification{} = item},
-        topics
-      )
-      when topic in ["user", "user:notification"] do
-    topics
-    |> Map.get("#{topic}:#{item.user_id}", [])
-    |> Enum.each(fn socket ->
-      with %User{} = user <- User.get_cached_by_ap_id(socket.assigns[:user].ap_id),
-           true <- should_send?(user, item) do
-        send(
-          socket.transport_pid,
-          {:text, represent_notification(socket.assigns[:user], item)}
-        )
-      end
-    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
-
-  defp represent_update(%Activity{} = activity) do
-    %{
-      event: "update",
-      payload:
-        Pleroma.Web.MastodonAPI.StatusView.render(
-          "status.json",
-          activity: activity
-        )
-        |> Jason.encode!()
-    }
-    |> Jason.encode!()
-  end
-
-  def represent_conversation(%Participation{} = participation) do
-    %{
-      event: "conversation",
-      payload:
-        Pleroma.Web.MastodonAPI.ConversationView.render("participation.json", %{
-          participation: participation,
-          for: participation.user
-        })
-        |> Jason.encode!()
-    }
-    |> Jason.encode!()
-  end
-
-  @spec represent_notification(User.t(), Notification.t()) :: binary()
-  defp represent_notification(%User{} = user, %Notification{} = notify) do
-    %{
-      event: "notification",
-      payload:
-        NotificationView.render(
-          "show.json",
-          %{notification: notify, for: user}
-        )
-        |> Jason.encode!()
-    }
-    |> Jason.encode!()
-  end
-
-  defp should_send?(%User{} = user, %Activity{} = item) do
-    blocks = user.info.blocks || []
-    mutes = user.info.mutes || []
-    reblog_mutes = user.info.muted_reblogs || []
-    domain_blocks = Pleroma.Web.ActivityPub.MRF.subdomains_regex(user.info.domain_blocks)
-
-    with parent when not is_nil(parent) <- Object.normalize(item),
-         true <- Enum.all?([blocks, mutes, reblog_mutes], &(item.actor not in &1)),
-         true <- Enum.all?([blocks, mutes], &(parent.data["actor"] not in &1)),
-         %{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, item) 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 socket ->
-      # Get the current user so we have up-to-date blocks etc.
-      if socket.assigns[:user] do
-        user = User.get_cached_by_ap_id(socket.assigns[:user].ap_id)
-
-        if should_send?(user, item) do
-          send(socket.transport_pid, {:text, represent_update(item, user)})
-        end
-      else
-        send(socket.transport_pid, {:text, represent_update(item)})
-      end
-    end)
-  end
-
-  def push_to_socket(topics, topic, %Participation{} = participation) do
-    Enum.each(topics[topic] || [], fn socket ->
-      send(socket.transport_pid, {:text, represent_conversation(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 socket ->
-      send(
-        socket.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 socket ->
-      # Get the current user so we have up-to-date blocks etc.
-      if socket.assigns[:user] do
-        user = User.get_cached_by_ap_id(socket.assigns[:user].ap_id)
-        blocks = user.info.blocks || []
-        mutes = user.info.mutes || []
-
-        with true <- Enum.all?([blocks, mutes], &(item.actor not in &1)),
-             true <- thread_containment(item, user) do
-          send(socket.transport_pid, {:text, represent_update(item, user)})
-        end
-      else
-        send(socket.transport_pid, {:text, represent_update(item)})
-      end
-    end)
-  end
-
-  defp internal_topic(topic, socket) when topic in ~w[user user:notification direct] do
-    "#{topic}:#{socket.assigns[:user].id}"
-  end
-
-  defp internal_topic(topic, _), do: topic
-
-  @spec thread_containment(Activity.t(), User.t()) :: boolean()
-  defp thread_containment(_activity, %User{info: %{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
diff --git a/lib/pleroma/web/streamer/ping.ex b/lib/pleroma/web/streamer/ping.ex
new file mode 100644
index 000000000..f77cbb95c
--- /dev/null
+++ b/lib/pleroma/web/streamer/ping.ex
@@ -0,0 +1,33 @@
+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
new file mode 100644
index 000000000..7b5199068
--- /dev/null
+++ b/lib/pleroma/web/streamer/state.ex
@@ -0,0 +1,68 @@
+defmodule Pleroma.Web.Streamer.State do
+  use GenServer
+  require Logger
+
+  alias Pleroma.Web.Streamer.StreamerSocket
+
+  def start_link(_) do
+    GenServer.start_link(__MODULE__, %{sockets: %{}}, name: __MODULE__)
+  end
+
+  def add_socket(topic, socket) do
+    GenServer.call(__MODULE__, {:add, socket, topic})
+  end
+
+  def remove_socket(topic, socket) do
+    GenServer.call(__MODULE__, {:remove, socket, topic})
+  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, socket, topic}, _from, %{sockets: sockets} = state) do
+    internal_topic = internal_topic(topic, socket)
+    stream_socket = StreamerSocket.from_socket(socket)
+
+    sockets_for_topic =
+      sockets
+      |> Map.get(internal_topic, [])
+      |> List.insert_at(0, stream_socket)
+      |> Enum.uniq()
+
+    state = put_in(state, [:sockets, internal_topic], sockets_for_topic)
+    Logger.debug("Got new conn for #{topic}")
+    {:reply, state, state}
+  end
+
+  def handle_call({:remove, socket, topic}, _from, %{sockets: sockets} = state) do
+    internal_topic = internal_topic(topic, socket)
+    stream_socket = StreamerSocket.from_socket(socket)
+
+    sockets_for_topic =
+      sockets
+      |> Map.get(internal_topic, [])
+      |> List.delete(stream_socket)
+
+    state = Kernel.put_in(state, [:sockets, internal_topic], sockets_for_topic)
+    {:reply, state, state}
+  end
+
+  defp internal_topic(topic, socket)
+       when topic in ~w[user user:notification direct] do
+    "#{topic}:#{socket.assigns[:user].id}"
+  end
+
+  defp internal_topic(topic, _) do
+    topic
+  end
+end
diff --git a/lib/pleroma/web/streamer/streamer.ex b/lib/pleroma/web/streamer/streamer.ex
new file mode 100644
index 000000000..8cf719277
--- /dev/null
+++ b/lib/pleroma/web/streamer/streamer.ex
@@ -0,0 +1,55 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Streamer do
+  alias Pleroma.Web.Streamer.State
+  alias Pleroma.Web.Streamer.Worker
+
+  @timeout 60_000
+  @mix_env Mix.env()
+
+  def add_socket(topic, socket) do
+    State.add_socket(topic, socket)
+  end
+
+  def remove_socket(topic, socket) do
+    State.remove_socket(topic, socket)
+  end
+
+  def get_sockets do
+    State.get_sockets()
+  end
+
+  def stream(topics, items) do
+    if should_send?() do
+      Task.async(fn ->
+        :poolboy.transaction(
+          :streamer_worker,
+          &Worker.stream(&1, topics, items),
+          @timeout
+        )
+      end)
+    end
+  end
+
+  def supervisor, do: Pleroma.Web.Streamer.Supervisor
+
+  defp should_send? do
+    handle_should_send(@mix_env)
+  end
+
+  defp handle_should_send(:test) do
+    case Process.whereis(:streamer_worker) do
+      nil ->
+        false
+
+      pid ->
+        Process.alive?(pid)
+    end
+  end
+
+  defp handle_should_send(_) do
+    true
+  end
+end
diff --git a/lib/pleroma/web/streamer/streamer_socket.ex b/lib/pleroma/web/streamer/streamer_socket.ex
new file mode 100644
index 000000000..f006c0306
--- /dev/null
+++ b/lib/pleroma/web/streamer/streamer_socket.ex
@@ -0,0 +1,31 @@
+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
new file mode 100644
index 000000000..6afe19323
--- /dev/null
+++ b/lib/pleroma/web/streamer/supervisor.ex
@@ -0,0 +1,33 @@
+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
new file mode 100644
index 000000000..5804508eb
--- /dev/null
+++ b/lib/pleroma/web/streamer/worker.ex
@@ -0,0 +1,220 @@
+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
+    blocks = user.info.blocks || []
+    mutes = user.info.mutes || []
+    reblog_mutes = user.info.muted_reblogs || []
+    domain_blocks = Pleroma.Web.ActivityPub.MRF.subdomains_regex(user.info.domain_blocks)
+
+    with parent when not is_nil(parent) <- Object.normalize(item),
+         true <- Enum.all?([blocks, mutes, reblog_mutes], &(item.actor not in &1)),
+         true <- Enum.all?([blocks, mutes], &(parent.data["actor"] not in &1)),
+         %{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, item) 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)
+        blocks = user.info.blocks || []
+        mutes = user.info.mutes || []
+
+        with true <- Enum.all?([blocks, mutes], &(item.actor not in &1)),
+             true <- thread_containment(item, user) 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{info: %{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
diff --git a/lib/pleroma/web/views/streamer_view.ex b/lib/pleroma/web/views/streamer_view.ex
new file mode 100644
index 000000000..b13030fa0
--- /dev/null
+++ b/lib/pleroma/web/views/streamer_view.ex
@@ -0,0 +1,66 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.StreamerView do
+  use Pleroma.Web, :view
+
+  alias Pleroma.Activity
+  alias Pleroma.Conversation.Participation
+  alias Pleroma.Notification
+  alias Pleroma.User
+  alias Pleroma.Web.MastodonAPI.NotificationView
+
+  def render("update.json", %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 render("notification.json", %User{} = user, %Notification{} = notify) do
+    %{
+      event: "notification",
+      payload:
+        NotificationView.render(
+          "show.json",
+          %{notification: notify, for: user}
+        )
+        |> Jason.encode!()
+    }
+    |> Jason.encode!()
+  end
+
+  def render("update.json", %Activity{} = activity) do
+    %{
+      event: "update",
+      payload:
+        Pleroma.Web.MastodonAPI.StatusView.render(
+          "status.json",
+          activity: activity
+        )
+        |> Jason.encode!()
+    }
+    |> Jason.encode!()
+  end
+
+  def render("conversation.json", %Participation{} = participation) do
+    %{
+      event: "conversation",
+      payload:
+        Pleroma.Web.MastodonAPI.ConversationView.render("participation.json", %{
+          participation: participation,
+          for: participation.user
+        })
+        |> Jason.encode!()
+    }
+    |> Jason.encode!()
+  end
+end