support for expires_in/expires_at in filters

lib/pleroma/workers/purge_expired_filter.ex

@@ -0,0 +1,43 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Workers.PurgeExpiredFilter do
+  @moduledoc """
+  Worker which purges expired filters
+  """
+
+  use Oban.Worker, queue: :filter_expiration, max_attempts: 1, unique: [fields: [:args]]
+
+  import Ecto.Query
+
+  alias Oban.Job
+  alias Pleroma.Repo
+
+  @spec enqueue(%{filter_id: integer(), expires_at: DateTime.t()}) ::
+          {:ok, Job.t()} | {:error, Ecto.Changeset.t()}
+  def enqueue(args) do
+    {scheduled_at, args} = Map.pop(args, :expires_at)
+
+    args
+    |> new(scheduled_at: scheduled_at)
+    |> Oban.insert()
+  end
+
+  @impl true
+  def perform(%Job{args: %{"filter_id" => id}}) do
+    Pleroma.Filter
+    |> Repo.get(id)
+    |> Repo.delete()
+  end
+
+  @spec get_expiration(pos_integer()) :: Job.t() | nil
+  def get_expiration(id) do
+    from(j in Job,
+      where: j.state == "scheduled",
+      where: j.queue == "filter_expiration",
+      where: fragment("?->'filter_id' = ?", j.args, ^id)
+    )
+    |> Repo.one()
+  end
+end