user: implement dynamic refresh of profiles (gets rid of need for fix_ap_users task)

lib/pleroma/user.ex

@@ -22,6 +22,7 @@ defmodule Pleroma.User do
     field(:info, :map, default: %{})
     field(:follower_address, :string)
     field(:search_distance, :float, virtual: true)
+    field(:last_refreshed_at, :naive_datetime)
     has_many(:notifications, Notification)
 
     timestamps()
@@ -112,8 +113,12 @@ def update_changeset(struct, params \\ %{}) do
   end
 
   def upgrade_changeset(struct, params \\ %{}) do
+    params =
+      params
+      |> Map.put(:last_refreshed_at, NaiveDateTime.utc_now())
+
     struct
-    |> cast(params, [:bio, :name, :info, :follower_address, :avatar])
+    |> cast(params, [:bio, :name, :info, :follower_address, :avatar, :last_refreshed_at])
     |> unique_constraint(:nickname)
     |> validate_format(:nickname, ~r/^[a-zA-Z\d]+$/)
     |> validate_length(:bio, max: 5000)
@@ -169,6 +174,16 @@ def register_changeset(struct, params \\ %{}) do
     end
   end
 
+  def needs_update?(%User{local: true}), do: false
+
+  def needs_update?(%User{local: false, last_refreshed_at: nil}), do: true
+
+  def needs_update?(%User{local: false} = user) do
+    NaiveDateTime.diff(NaiveDateTime.utc_now(), user.last_refreshed_at) >= 86400
+  end
+
+  def needs_update?(_), do: true
+
   def maybe_direct_follow(%User{} = follower, %User{info: info} = followed) do
     user_config = Application.get_env(:pleroma, :user)
     deny_follow_blocked = Keyword.get(user_config, :deny_follow_blocked)
@@ -655,7 +670,9 @@ def delete(%User{} = user) do
   end
 
   def get_or_fetch_by_ap_id(ap_id) do
-    if user = get_by_ap_id(ap_id) do
+    user = get_by_ap_id(ap_id)
+
+    if !is_nil(user) and !User.needs_update?(user) do
       user
     else
       ap_try = ActivityPub.make_user_from_ap_id(ap_id)

priv/repo/migrations/20180919060348_users_add_last_refreshed_at.exs

+defmodule Pleroma.Repo.Migrations.UsersAddLastRefreshedAt do
+  use Ecto.Migration
+
+  def change do
+    alter table(:users) do
+      add :last_refreshed_at, :naive_datetime
+    end
+  end
+end