Moving some background jobs into simple tasks

- fetching activity data
- attachment prefetching
- using limiter to prevent overload

6 files changed, 25 insertions, 29 deletions

diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex
index 7c4cd9626..769af1806 100644
--- a/lib/pleroma/application.ex
+++ b/lib/pleroma/application.ex
@@ -57,6 +57,7 @@ defmodule Pleroma.Application do
     setup_instrumenters()
     load_custom_modules()
     Pleroma.Docs.JSON.compile()
+    limiters_setup()
 
     adapter = Application.get_env(:tesla, :adapter)
 
@@ -273,4 +274,9 @@ defmodule Pleroma.Application do
   end
 
   defp http_children(_, _), do: []
+
+  def limiters_setup do
+    [Pleroma.Web.RichMedia.Helpers, Pleroma.Web.MediaProxy]
+    |> Enum.each(&ConcurrentLimiter.new(&1, 1, 0))
+  end
 end
diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index d8f685d38..6008f2f4a 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -123,7 +123,9 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
       # Splice in the child object if we have one.
       activity = Maps.put_if_present(activity, :object, object)
 
-      BackgroundWorker.enqueue("fetch_data_for_activity", %{"activity_id" => activity.id})
+      ConcurrentLimiter.limit(Pleroma.Web.RichMedia.Helpers, fn ->
+        Task.start(fn -> Pleroma.Web.RichMedia.Helpers.fetch_data_for_activity(activity) end)
+      end)
 
       {:ok, activity}
     else
diff --git a/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex b/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
index 0fb05d3c4..816cc89bf 100644
--- a/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
@@ -8,7 +8,6 @@ defmodule Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy do
 
   alias Pleroma.HTTP
   alias Pleroma.Web.MediaProxy
-  alias Pleroma.Workers.BackgroundWorker
 
   require Logger
 
@@ -17,7 +16,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy do
     recv_timeout: 10_000
   ]
 
-  def perform(:prefetch, url) do
+  defp prefetch(url) do
     # Fetching only proxiable resources
     if MediaProxy.enabled?() and MediaProxy.url_proxiable?(url) do
       # If preview proxy is enabled, it'll also hit media proxy (so we're caching both requests)
@@ -25,17 +24,25 @@ defmodule Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy do
 
       Logger.debug("Prefetching #{inspect(url)} as #{inspect(prefetch_url)}")
 
-      HTTP.get(prefetch_url, [], @adapter_options)
+      if Pleroma.Config.get(:env) == :test do
+        fetch(prefetch_url)
+      else
+        ConcurrentLimiter.limit(MediaProxy, fn ->
+          Task.start(fn -> fetch(prefetch_url) end)
+        end)
+      end
     end
   end
 
-  def perform(:preload, %{"object" => %{"attachment" => attachments}} = _message) do
+  defp fetch(url), do: HTTP.get(url, [], @adapter_options)
+
+  defp preload(%{"object" => %{"attachment" => attachments}} = _message) do
     Enum.each(attachments, fn
       %{"url" => url} when is_list(url) ->
         url
         |> Enum.each(fn
           %{"href" => href} ->
-            BackgroundWorker.enqueue("media_proxy_prefetch", %{"url" => href})
+            prefetch(href)
 
           x ->
             Logger.debug("Unhandled attachment URL object #{inspect(x)}")
@@ -51,7 +58,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy do
         %{"type" => "Create", "object" => %{"attachment" => attachments} = _object} = message
       )
       when is_list(attachments) and length(attachments) > 0 do
-    BackgroundWorker.enqueue("media_proxy_preload", %{"message" => message})
+    preload(message)
 
     {:ok, message}
   end
diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index bbff35c36..4d8fb721e 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -24,7 +24,6 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
   alias Pleroma.Web.ActivityPub.Utils
   alias Pleroma.Web.Push
   alias Pleroma.Web.Streamer
-  alias Pleroma.Workers.BackgroundWorker
 
   require Logger
 
@@ -191,7 +190,9 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
         Object.increase_replies_count(in_reply_to)
       end
 
-      BackgroundWorker.enqueue("fetch_data_for_activity", %{"activity_id" => activity.id})
+      ConcurrentLimiter.limit(Pleroma.Web.RichMedia.Helpers, fn ->
+        Task.start(fn -> Pleroma.Web.RichMedia.Helpers.fetch_data_for_activity(activity) end)
+      end)
 
       meta =
         meta
diff --git a/lib/pleroma/web/rich_media/helpers.ex b/lib/pleroma/web/rich_media/helpers.ex
index d67b594b5..442bf9995 100644
--- a/lib/pleroma/web/rich_media/helpers.ex
+++ b/lib/pleroma/web/rich_media/helpers.ex
@@ -78,11 +78,6 @@ defmodule Pleroma.Web.RichMedia.Helpers do
 
   def fetch_data_for_activity(_), do: %{}
 
-  def perform(:fetch, %Activity{} = activity) do
-    fetch_data_for_activity(activity)
-    :ok
-  end
-
   def rich_media_get(url) do
     headers = [{"user-agent", Pleroma.Application.user_agent() <> "; Bot"}]
 
diff --git a/lib/pleroma/workers/background_worker.ex b/lib/pleroma/workers/background_worker.ex
index 55b5a13d9..0647c65ae 100644
--- a/lib/pleroma/workers/background_worker.ex
+++ b/lib/pleroma/workers/background_worker.ex
@@ -3,9 +3,7 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Workers.BackgroundWorker do
-  alias Pleroma.Activity
   alias Pleroma.User
-  alias Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy
 
   use Pleroma.Workers.WorkerHelper, queue: "background"
 
@@ -32,19 +30,6 @@ defmodule Pleroma.Workers.BackgroundWorker do
     {:ok, User.Import.perform(String.to_atom(op), user, identifiers)}
   end
 
-  def perform(%Job{args: %{"op" => "media_proxy_preload", "message" => message}}) do
-    MediaProxyWarmingPolicy.perform(:preload, message)
-  end
-
-  def perform(%Job{args: %{"op" => "media_proxy_prefetch", "url" => url}}) do
-    MediaProxyWarmingPolicy.perform(:prefetch, url)
-  end
-
-  def perform(%Job{args: %{"op" => "fetch_data_for_activity", "activity_id" => activity_id}}) do
-    activity = Activity.get_by_id(activity_id)
-    Pleroma.Web.RichMedia.Helpers.perform(:fetch, activity)
-  end
-
   def perform(%Job{
         args: %{"op" => "move_following", "origin_id" => origin_id, "target_id" => target_id}
       }) do