Add scheduler for sending scheduled activities to the queue

lib/pleroma/scheduled_activity_worker.ex

@@ -0,0 +1,58 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.ScheduledActivityWorker do
+  @moduledoc """
+  Sends scheduled activities to the job queue.
+  """
+
+  alias Pleroma.Config
+  alias Pleroma.ScheduledActivity
+  alias Pleroma.User
+  alias Pleroma.Web.CommonAPI
+  use GenServer
+  require Logger
+
+  @schedule_interval :timer.minutes(1)
+
+  def start_link do
+    GenServer.start_link(__MODULE__, nil)
+  end
+
+  def init(_) do
+    if Config.get([ScheduledActivity, :enabled]) do
+      schedule_next()
+      {:ok, nil}
+    else
+      :ignore
+    end
+  end
+
+  def perform(:execute, scheduled_activity_id) do
+    try do
+      {:ok, scheduled_activity} = ScheduledActivity.delete(scheduled_activity_id)
+      %User{} = user = User.get_cached_by_id(scheduled_activity.user_id)
+      {:ok, _result} = CommonAPI.post(user, scheduled_activity.params)
+    rescue
+      error ->
+        Logger.error(
+          "#{__MODULE__} Couldn't create a status from the scheduled activity: #{inspect(error)}"
+        )
+    end
+  end
+
+  def handle_info(:perform, state) do
+    ScheduledActivity.due_activities(@schedule_interval)
+    |> Enum.each(fn scheduled_activity ->
+      PleromaJobQueue.enqueue(:scheduled_activities, __MODULE__, [:execute, scheduled_activity.id])
+    end)
+
+    schedule_next()
+    {:noreply, state}
+  end
+
+  defp schedule_next do
+    Process.send_after(self(), :perform, @schedule_interval)
+  end
+end