[#1149] Introduced quantum job scheduler. Documentation & config changes.

lib/pleroma/application.ex

@@ -31,6 +31,7 @@ defmodule Pleroma.Application do
     children =
       [
         Pleroma.Repo,
+        Pleroma.Scheduler,
         Pleroma.Config.TransferTask,
         Pleroma.Emoji,
         Pleroma.Captcha,
@@ -69,9 +70,7 @@ defmodule Pleroma.Application do
     # See http://elixir-lang.org/docs/stable/elixir/Supervisor.html
     # for other strategies and supported options
     opts = [strategy: :one_for_one, name: Pleroma.Supervisor]
-    result = Supervisor.start_link(children, opts)
-    :ok = after_supervisor_start()
-    result
+    Supervisor.start_link(children, opts)
   end
 
   defp setup_instrumenters do
@@ -162,18 +161,4 @@ defmodule Pleroma.Application do
       :hackney_pool.child_spec(pool, options)
     end
   end
-
-  defp after_supervisor_start do
-    with digest_config <- Application.get_env(:pleroma, :email_notifications)[:digest],
-         true <- digest_config[:active] do
-      # TODO: consider replacing with `quantum` scheduler
-      PleromaJobQueue.schedule(
-        digest_config[:schedule],
-        :digest_emails,
-        Pleroma.DigestEmailWorker
-      )
-    end
-
-    :ok
-  end
 end

lib/pleroma/scheduler.ex

@@ -0,0 +1,7 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Scheduler do
+  use Quantum.Scheduler, otp_app: :pleroma
+end

lib/pleroma/web/federator/federator.ex

@@ -21,7 +21,7 @@ defmodule Pleroma.Web.Federator do
   defdelegate worker_args(queue), to: Pleroma.Workers.Helper
 
   def init do
-    # 1 minute
+    # To do: consider removing this call in favor of scheduled execution (`quantum`-based)
     refresh_subscriptions(schedule_in: 60)
   end
 
@@ -146,12 +146,6 @@ defmodule Pleroma.Web.Federator do
   def perform(:refresh_subscriptions) do
     Logger.debug("Federator running refresh subscriptions")
     Websub.refresh_subscriptions()
-
-    spawn(fn ->
-      # 6 hours
-      Process.sleep(1000 * 60 * 60 * 6)
-      refresh_subscriptions()
-    end)
   end
 
   def ap_enabled_actor(id) do