Merge branch 'oban-overuse' into 'develop'

Expired activities as scheduled jobs in Oban

See merge request pleroma/pleroma!2916

14 files changed, 174 insertions, 170 deletions

diff --git a/lib/mix/tasks/pleroma/database.ex b/lib/mix/tasks/pleroma/database.ex
index 7d8f00b08..7f1108dcf 100644
--- a/lib/mix/tasks/pleroma/database.ex
+++ b/lib/mix/tasks/pleroma/database.ex
@@ -133,8 +133,7 @@ defmodule Mix.Tasks.Pleroma.Database do
     days = Pleroma.Config.get([:mrf_activity_expiration, :days], 365)
 
     Pleroma.Activity
-    |> join(:left, [a], u in assoc(a, :expiration))
-    |> join(:inner, [a, _u], o in Object,
+    |> join(:inner, [a], o in Object,
       on:
         fragment(
           "(?->>'id') = COALESCE((?)->'object'->> 'id', (?)->>'object')",
@@ -144,14 +143,20 @@ defmodule Mix.Tasks.Pleroma.Database do
         )
     )
     |> where(local: true)
-    |> where([a, u], is_nil(u))
     |> where([a], fragment("(? ->> 'type'::text) = 'Create'", a.data))
-    |> where([_a, _u, o], fragment("?->>'type' = 'Note'", o.data))
+    |> where([_a, o], fragment("?->>'type' = 'Note'", o.data))
     |> Pleroma.RepoStreamer.chunk_stream(100)
     |> Stream.each(fn activities ->
       Enum.each(activities, fn activity ->
-        expires_at = Timex.shift(activity.inserted_at, days: days)
-        Pleroma.ActivityExpiration.create(activity, expires_at, false)
+        expires_at =
+          activity.inserted_at
+          |> DateTime.from_naive!("Etc/UTC")
+          |> Timex.shift(days: days)
+
+        Pleroma.Workers.PurgeExpiredActivity.enqueue(%{
+          activity_id: activity.id,
+          expires_at: expires_at
+        })
       end)
     end)
     |> Stream.run()
diff --git a/lib/pleroma/activity.ex b/lib/pleroma/activity.ex
index 97feebeaa..17af04257 100644
--- a/lib/pleroma/activity.ex
+++ b/lib/pleroma/activity.ex
@@ -7,7 +7,6 @@ defmodule Pleroma.Activity do
 
   alias Pleroma.Activity
   alias Pleroma.Activity.Queries
-  alias Pleroma.ActivityExpiration
   alias Pleroma.Bookmark
   alias Pleroma.Notification
   alias Pleroma.Object
@@ -60,8 +59,6 @@ defmodule Pleroma.Activity do
     # typical case.
     has_one(:object, Object, on_delete: :nothing, foreign_key: :id)
 
-    has_one(:expiration, ActivityExpiration, on_delete: :delete_all)
-
     timestamps()
   end
 
@@ -304,14 +301,14 @@ defmodule Pleroma.Activity do
     |> Repo.all()
   end
 
-  def follow_requests_for_actor(%Pleroma.User{ap_id: ap_id}) do
+  def follow_requests_for_actor(%User{ap_id: ap_id}) do
     ap_id
     |> Queries.by_object_id()
     |> Queries.by_type("Follow")
     |> where([a], fragment("? ->> 'state' = 'pending'", a.data))
   end
 
-  def following_requests_for_actor(%Pleroma.User{ap_id: ap_id}) do
+  def following_requests_for_actor(%User{ap_id: ap_id}) do
     Queries.by_type("Follow")
     |> where([a], fragment("?->>'state' = 'pending'", a.data))
     |> where([a], a.actor == ^ap_id)
diff --git a/lib/pleroma/activity_expiration.ex b/lib/pleroma/activity_expiration.ex
deleted file mode 100644
index 955f0578e..000000000
--- a/lib/pleroma/activity_expiration.ex
+++ /dev/null
@@ -1,74 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.ActivityExpiration do
-  use Ecto.Schema
-
-  alias Pleroma.Activity
-  alias Pleroma.ActivityExpiration
-  alias Pleroma.Repo
-
-  import Ecto.Changeset
-  import Ecto.Query
-
-  @type t :: %__MODULE__{}
-  @min_activity_lifetime :timer.hours(1)
-
-  schema "activity_expirations" do
-    belongs_to(:activity, Activity, type: FlakeId.Ecto.CompatType)
-    field(:scheduled_at, :naive_datetime)
-  end
-
-  def changeset(%ActivityExpiration{} = expiration, attrs, validate_scheduled_at) do
-    expiration
-    |> cast(attrs, [:scheduled_at])
-    |> validate_required([:scheduled_at])
-    |> validate_scheduled_at(validate_scheduled_at)
-  end
-
-  def get_by_activity_id(activity_id) do
-    ActivityExpiration
-    |> where([exp], exp.activity_id == ^activity_id)
-    |> Repo.one()
-  end
-
-  def create(%Activity{} = activity, scheduled_at, validate_scheduled_at \\ true) do
-    %ActivityExpiration{activity_id: activity.id}
-    |> changeset(%{scheduled_at: scheduled_at}, validate_scheduled_at)
-    |> Repo.insert()
-  end
-
-  def due_expirations(offset \\ 0) do
-    naive_datetime =
-      NaiveDateTime.utc_now()
-      |> NaiveDateTime.add(offset, :millisecond)
-
-    ActivityExpiration
-    |> where([exp], exp.scheduled_at < ^naive_datetime)
-    |> limit(50)
-    |> preload(:activity)
-    |> Repo.all()
-    |> Enum.reject(fn %{activity: activity} ->
-      Activity.pinned_by_actor?(activity)
-    end)
-  end
-
-  def validate_scheduled_at(changeset, false), do: changeset
-
-  def validate_scheduled_at(changeset, true) do
-    validate_change(changeset, :scheduled_at, fn _, scheduled_at ->
-      if not expires_late_enough?(scheduled_at) do
-        [scheduled_at: "an ephemeral activity must live for at least one hour"]
-      else
-        []
-      end
-    end)
-  end
-
-  def expires_late_enough?(scheduled_at) do
-    now = NaiveDateTime.utc_now()
-    diff = NaiveDateTime.diff(scheduled_at, now, :millisecond)
-    diff > @min_activity_lifetime
-  end
-end
diff --git a/lib/pleroma/config/deprecation_warnings.ex b/lib/pleroma/config/deprecation_warnings.ex
index 2bfe4ddba..412d55a77 100644
--- a/lib/pleroma/config/deprecation_warnings.ex
+++ b/lib/pleroma/config/deprecation_warnings.ex
@@ -8,7 +8,7 @@ defmodule Pleroma.Config.DeprecationWarnings do
   require Logger
   alias Pleroma.Config
 
-  @type config_namespace() :: [atom()]
+  @type config_namespace() :: atom() | [atom()]
   @type config_map() :: {config_namespace(), config_namespace(), String.t()}
 
   @mrf_config_map [
@@ -57,6 +57,7 @@ defmodule Pleroma.Config.DeprecationWarnings do
     check_media_proxy_whitelist_config()
     check_welcome_message_config()
     check_gun_pool_options()
+    check_activity_expiration_config()
   end
 
   def check_welcome_message_config do
@@ -158,4 +159,20 @@ defmodule Pleroma.Config.DeprecationWarnings do
       Config.put(:pools, updated_config)
     end
   end
+
+  @spec check_activity_expiration_config() :: :ok | nil
+  def check_activity_expiration_config do
+    warning_preface = """
+    !!!DEPRECATION WARNING!!!
+      Your config is using old namespace for activity expiration configuration. Setting should work for now, but you are advised to change to new namespace to prevent possible issues later:
+    """
+
+    move_namespace_and_warn(
+      [
+        {Pleroma.ActivityExpiration, Pleroma.Workers.PurgeExpiredActivity,
+         "\n* `config :pleroma, Pleroma.ActivityExpiration` is now `config :pleroma, Pleroma.Workers.PurgeExpiredActivity`"}
+      ],
+      warning_preface
+    )
+  end
 end
diff --git a/lib/pleroma/config/oban.ex b/lib/pleroma/config/oban.ex
index 81758c93d..9f601b1a3 100644
--- a/lib/pleroma/config/oban.ex
+++ b/lib/pleroma/config/oban.ex
@@ -5,7 +5,11 @@ defmodule Pleroma.Config.Oban do
     oban_config = Pleroma.Config.get(Oban)
 
     crontab =
-      [Pleroma.Workers.Cron.StatsWorker, Pleroma.Workers.Cron.ClearOauthTokenWorker]
+      [
+        Pleroma.Workers.Cron.StatsWorker,
+        Pleroma.Workers.Cron.PurgeExpiredActivitiesWorker,
+        Pleroma.Workers.Cron.ClearOauthTokenWorker
+      ]
       |> Enum.reduce(oban_config[:crontab], fn removed_worker, acc ->
         with acc when is_list(acc) <- acc,
              setting when is_tuple(setting) <-
diff --git a/lib/pleroma/user.ex b/lib/pleroma/user.ex
index f323fc6ed..e73d19964 100644
--- a/lib/pleroma/user.ex
+++ b/lib/pleroma/user.ex
@@ -2315,6 +2315,11 @@ defmodule Pleroma.User do
       max_pinned_statuses = Config.get([:instance, :max_pinned_statuses], 0)
       params = %{pinned_activities: user.pinned_activities ++ [id]}
 
+      # if pinned activity was scheduled for deletion, we remove job
+      if expiration = Pleroma.Workers.PurgeExpiredActivity.get_expiration(id) do
+        Oban.cancel_job(expiration.id)
+      end
+
       user
       |> cast(params, [:pinned_activities])
       |> validate_length(:pinned_activities,
@@ -2327,9 +2332,19 @@ defmodule Pleroma.User do
     |> update_and_set_cache()
   end
 
-  def remove_pinnned_activity(user, %Pleroma.Activity{id: id}) do
+  def remove_pinnned_activity(user, %Pleroma.Activity{id: id, data: data}) do
     params = %{pinned_activities: List.delete(user.pinned_activities, id)}
 
+    # if pinned activity was scheduled for deletion, we reschedule it for deletion
+    if data["expires_at"] do
+      {:ok, expires_at, _} = DateTime.from_iso8601(data["expires_at"])
+
+      Pleroma.Workers.PurgeExpiredActivity.enqueue(%{
+        activity_id: id,
+        expires_at: expires_at
+      })
+    end
+
     user
     |> cast(params, [:pinned_activities])
     |> update_and_set_cache()
diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 333621413..66a9f78a3 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -5,7 +5,6 @@
 defmodule Pleroma.Web.ActivityPub.ActivityPub do
   alias Pleroma.Activity
   alias Pleroma.Activity.Ir.Topics
-  alias Pleroma.ActivityExpiration
   alias Pleroma.Config
   alias Pleroma.Constants
   alias Pleroma.Conversation
@@ -102,7 +101,9 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
              local: local,
              recipients: recipients,
              actor: object["actor"]
-           }) do
+           }),
+         # TODO: add tests for expired activities, when Note type will be supported in new pipeline
+         {:ok, _} <- maybe_create_activity_expiration(activity) do
       {:ok, activity, meta}
     end
   end
@@ -111,23 +112,14 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
   def insert(map, local \\ true, fake \\ false, bypass_actor_check \\ false) when is_map(map) do
     with nil <- Activity.normalize(map),
          map <- lazy_put_activity_defaults(map, fake),
-         true <- bypass_actor_check || check_actor_is_active(map["actor"]),
-         {_, true} <- {:remote_limit_error, check_remote_limit(map)},
+         {_, true} <- {:actor_check, bypass_actor_check || check_actor_is_active(map["actor"])},
+         {_, true} <- {:remote_limit_pass, check_remote_limit(map)},
          {:ok, map} <- MRF.filter(map),
          {recipients, _, _} = get_recipients(map),
          {:fake, false, map, recipients} <- {:fake, fake, map, recipients},
          {:containment, :ok} <- {:containment, Containment.contain_child(map)},
-         {:ok, map, object} <- insert_full_object(map) do
-      {:ok, activity} =
-        %Activity{
-          data: map,
-          local: local,
-          actor: map["actor"],
-          recipients: recipients
-        }
-        |> Repo.insert()
-        |> maybe_create_activity_expiration()
-
+         {:ok, map, object} <- insert_full_object(map),
+         {:ok, activity} <- insert_activity_with_expiration(map, local, recipients) do
       # Splice in the child object if we have one.
       activity = Maps.put_if_present(activity, :object, object)
 
@@ -138,6 +130,15 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
       %Activity{} = activity ->
         {:ok, activity}
 
+      {:actor_check, _} ->
+        {:error, false}
+
+      {:containment, _} = error ->
+        error
+
+      {:error, _} = error ->
+        error
+
       {:fake, true, map, recipients} ->
         activity = %Activity{
           data: map,
@@ -150,8 +151,24 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
         Pleroma.Web.RichMedia.Helpers.fetch_data_for_activity(activity)
         {:ok, activity}
 
-      error ->
-        {:error, error}
+      {:remote_limit_pass, _} ->
+        {:error, :remote_limit}
+
+      {:reject, reason} ->
+        {:error, reason}
+    end
+  end
+
+  defp insert_activity_with_expiration(data, local, recipients) do
+    struct = %Activity{
+      data: data,
+      local: local,
+      actor: data["actor"],
+      recipients: recipients
+    }
+
+    with {:ok, activity} <- Repo.insert(struct) do
+      maybe_create_activity_expiration(activity)
     end
   end
 
@@ -164,13 +181,19 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
     stream_out_participations(participations)
   end
 
-  defp maybe_create_activity_expiration({:ok, %{data: %{"expires_at" => expires_at}} = activity}) do
-    with {:ok, _} <- ActivityExpiration.create(activity, expires_at) do
+  defp maybe_create_activity_expiration(
+         %{data: %{"expires_at" => %DateTime{} = expires_at}} = activity
+       ) do
+    with {:ok, _job} <-
+           Pleroma.Workers.PurgeExpiredActivity.enqueue(%{
+             activity_id: activity.id,
+             expires_at: expires_at
+           }) do
       {:ok, activity}
     end
   end
 
-  defp maybe_create_activity_expiration(result), do: result
+  defp maybe_create_activity_expiration(activity), do: {:ok, activity}
 
   defp create_or_bump_conversation(activity, actor) do
     with {:ok, conversation} <- Conversation.create_or_bump_for(activity),
diff --git a/lib/pleroma/web/activity_pub/mrf/activity_expiration_policy.ex b/lib/pleroma/web/activity_pub/mrf/activity_expiration_policy.ex
index 7b4c78e0f..bee47b4ed 100644
--- a/lib/pleroma/web/activity_pub/mrf/activity_expiration_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/activity_expiration_policy.ex
@@ -31,10 +31,10 @@ defmodule Pleroma.Web.ActivityPub.MRF.ActivityExpirationPolicy do
 
   defp maybe_add_expiration(activity) do
     days = Pleroma.Config.get([:mrf_activity_expiration, :days], 365)
-    expires_at = NaiveDateTime.utc_now() |> Timex.shift(days: days)
+    expires_at = DateTime.utc_now() |> Timex.shift(days: days)
 
     with %{"expires_at" => existing_expires_at} <- activity,
-         :lt <- NaiveDateTime.compare(existing_expires_at, expires_at) do
+         :lt <- DateTime.compare(existing_expires_at, expires_at) do
       activity
     else
       _ -> Map.put(activity, "expires_at", expires_at)
diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index a5e2323bd..46a8be767 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -7,7 +7,6 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
   """
   alias Pleroma.Activity
   alias Pleroma.Activity.Ir.Topics
-  alias Pleroma.ActivityExpiration
   alias Pleroma.Chat
   alias Pleroma.Chat.MessageReference
   alias Pleroma.FollowingRelationship
@@ -188,10 +187,6 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
         Object.increase_replies_count(in_reply_to)
       end
 
-      if expires_at = activity.data["expires_at"] do
-        ActivityExpiration.create(activity, expires_at)
-      end
-
       BackgroundWorker.enqueue("fetch_data_for_activity", %{"activity_id" => activity.id})
 
       meta =
diff --git a/lib/pleroma/web/common_api/activity_draft.ex b/lib/pleroma/web/common_api/activity_draft.ex
index f849b2e01..548f76609 100644
--- a/lib/pleroma/web/common_api/activity_draft.ex
+++ b/lib/pleroma/web/common_api/activity_draft.ex
@@ -202,7 +202,7 @@ defmodule Pleroma.Web.CommonAPI.ActivityDraft do
 
     additional =
       case draft.expires_at do
-        %NaiveDateTime{} = expires_at -> Map.put(additional, "expires_at", expires_at)
+        %DateTime{} = expires_at -> Map.put(additional, "expires_at", expires_at)
         _ -> additional
       end
 
diff --git a/lib/pleroma/web/common_api/common_api.ex b/lib/pleroma/web/common_api/common_api.ex
index 4ab533658..500c3883e 100644
--- a/lib/pleroma/web/common_api/common_api.ex
+++ b/lib/pleroma/web/common_api/common_api.ex
@@ -4,7 +4,6 @@
 
 defmodule Pleroma.Web.CommonAPI do
   alias Pleroma.Activity
-  alias Pleroma.ActivityExpiration
   alias Pleroma.Conversation.Participation
   alias Pleroma.Formatter
   alias Pleroma.Object
@@ -381,9 +380,9 @@ defmodule Pleroma.Web.CommonAPI do
   def check_expiry_date({:ok, nil} = res), do: res
 
   def check_expiry_date({:ok, in_seconds}) do
-    expiry = NaiveDateTime.utc_now() |> NaiveDateTime.add(in_seconds)
+    expiry = DateTime.add(DateTime.utc_now(), in_seconds)
 
-    if ActivityExpiration.expires_late_enough?(expiry) do
+    if Pleroma.Workers.PurgeExpiredActivity.expires_late_enough?(expiry) do
       {:ok, expiry}
     else
       {:error, "Expiry date is too soon"}
diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index 3fe1967be..ca42917fc 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -8,7 +8,6 @@ defmodule Pleroma.Web.MastodonAPI.StatusView do
   require Pleroma.Constants
 
   alias Pleroma.Activity
-  alias Pleroma.ActivityExpiration
   alias Pleroma.HTML
   alias Pleroma.Object
   alias Pleroma.Repo
@@ -245,8 +244,8 @@ defmodule Pleroma.Web.MastodonAPI.StatusView do
 
     expires_at =
       with true <- client_posted_this_activity,
-           %ActivityExpiration{scheduled_at: scheduled_at} <-
-             ActivityExpiration.get_by_activity_id(activity.id) do
+           %Oban.Job{scheduled_at: scheduled_at} <-
+             Pleroma.Workers.PurgeExpiredActivity.get_expiration(activity.id) do
         scheduled_at
       else
         _ -> nil
diff --git a/lib/pleroma/workers/cron/purge_expired_activities_worker.ex b/lib/pleroma/workers/cron/purge_expired_activities_worker.ex
deleted file mode 100644
index 6549207fc..000000000
--- a/lib/pleroma/workers/cron/purge_expired_activities_worker.ex
+++ /dev/null
@@ -1,48 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.Workers.Cron.PurgeExpiredActivitiesWorker do
-  @moduledoc """
-  The worker to purge expired activities.
-  """
-
-  use Oban.Worker, queue: "activity_expiration"
-
-  alias Pleroma.Activity
-  alias Pleroma.ActivityExpiration
-  alias Pleroma.Config
-  alias Pleroma.User
-  alias Pleroma.Web.CommonAPI
-
-  require Logger
-
-  @interval :timer.minutes(1)
-
-  @impl Oban.Worker
-  def perform(_job) do
-    if Config.get([ActivityExpiration, :enabled]) do
-      Enum.each(ActivityExpiration.due_expirations(@interval), &delete_activity/1)
-    end
-  after
-    :ok
-  end
-
-  def delete_activity(%ActivityExpiration{activity_id: activity_id}) do
-    with {:activity, %Activity{} = activity} <-
-           {:activity, Activity.get_by_id_with_object(activity_id)},
-         {:user, %User{} = user} <- {:user, User.get_by_ap_id(activity.object.data["actor"])} do
-      CommonAPI.delete(activity.id, user)
-    else
-      {:activity, _} ->
-        Logger.error(
-          "#{__MODULE__} Couldn't delete expired activity: not found activity ##{activity_id}"
-        )
-
-      {:user, _} ->
-        Logger.error(
-          "#{__MODULE__} Couldn't delete expired activity: not found actor of ##{activity_id}"
-        )
-    end
-  end
-end
diff --git a/lib/pleroma/workers/purge_expired_activity.ex b/lib/pleroma/workers/purge_expired_activity.ex
new file mode 100644
index 000000000..c168890a2
--- /dev/null
+++ b/lib/pleroma/workers/purge_expired_activity.ex
@@ -0,0 +1,72 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Workers.PurgeExpiredActivity do
+  @moduledoc """
+  Worker which purges expired activity.
+  """
+
+  use Oban.Worker, queue: :activity_expiration, max_attempts: 1
+
+  import Ecto.Query
+
+  alias Pleroma.Activity
+
+  @spec enqueue(map()) ::
+          {:ok, Oban.Job.t()}
+          | {:error, :expired_activities_disabled}
+          | {:error, :expiration_too_close}
+  def enqueue(args) do
+    with true <- enabled?() do
+      {scheduled_at, args} = Map.pop(args, :expires_at)
+
+      args
+      |> new(scheduled_at: scheduled_at)
+      |> Oban.insert()
+    end
+  end
+
+  @impl true
+  def perform(%Oban.Job{args: %{"activity_id" => id}}) do
+    with %Activity{} = activity <- find_activity(id),
+         %Pleroma.User{} = user <- find_user(activity.object.data["actor"]) do
+      Pleroma.Web.CommonAPI.delete(activity.id, user)
+    end
+  end
+
+  defp enabled? do
+    with false <- Pleroma.Config.get([__MODULE__, :enabled], false) do
+      {:error, :expired_activities_disabled}
+    end
+  end
+
+  defp find_activity(id) do
+    with nil <- Activity.get_by_id_with_object(id) do
+      {:error, :activity_not_found}
+    end
+  end
+
+  defp find_user(ap_id) do
+    with nil <- Pleroma.User.get_by_ap_id(ap_id) do
+      {:error, :user_not_found}
+    end
+  end
+
+  def get_expiration(id) do
+    from(j in Oban.Job,
+      where: j.state == "scheduled",
+      where: j.queue == "activity_expiration",
+      where: fragment("?->>'activity_id' = ?", j.args, ^id)
+    )
+    |> Pleroma.Repo.one()
+  end
+
+  @spec expires_late_enough?(DateTime.t()) :: boolean()
+  def expires_late_enough?(scheduled_at) do
+    now = DateTime.utc_now()
+    diff = DateTime.diff(scheduled_at, now, :millisecond)
+    min_lifetime = Pleroma.Config.get([__MODULE__, :min_lifetime], 600)
+    diff > :timer.seconds(min_lifetime)
+  end
+end