Rework user deletion

lib/pleroma/repo_streamer.ex

+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.RepoStreamer do
+  alias Pleroma.Repo
+  import Ecto.Query
+
+  def chunk_stream(query, chunk_size) do
+    Stream.unfold(0, fn
+      :halt ->
+        {[], :halt}
+
+      last_id ->
+        query
+        |> order_by(asc: :id)
+        |> where([r], r.id > ^last_id)
+        |> limit(^chunk_size)
+        |> Repo.all()
+        |> case do
+          [] ->
+            {[], :halt}
+
+          records ->
+            last_id = List.last(records).id
+            {records, last_id}
+        end
+    end)
+    |> Stream.take_while(fn
+      [] -> false
+      _ -> true
+    end)
+  end
+end

lib/pleroma/user.ex

@@ -15,6 +15,7 @@ defmodule Pleroma.User do
   alias Pleroma.Object
   alias Pleroma.Registration
   alias Pleroma.Repo
+  alias Pleroma.RepoStreamer
   alias Pleroma.User
   alias Pleroma.Web
   alias Pleroma.Web.ActivityPub.ActivityPub
@@ -932,18 +933,24 @@ def delete(%User{} = user),
 
   @spec perform(atom(), User.t()) :: {:ok, User.t()}
   def perform(:delete, %User{} = user) do
-    {:ok, user} = User.deactivate(user)
-
     # Remove all relationships
     {:ok, followers} = User.get_followers(user)
 
-    Enum.each(followers, fn follower -> User.unfollow(follower, user) end)
+    Enum.each(followers, fn follower ->
+      ActivityPub.unfollow(follower, user)
+      User.unfollow(follower, user)
+    end)
 
     {:ok, friends} = User.get_friends(user)
 
-    Enum.each(friends, fn followed -> User.unfollow(user, followed) end)
+    Enum.each(friends, fn followed ->
+      ActivityPub.unfollow(user, followed)
+      User.unfollow(user, followed)
+    end)
 
     delete_user_activities(user)
+
+    {:ok, _user} = Repo.delete(user)
   end
 
   @spec perform(atom(), User.t()) :: {:ok, User.t()}
@@ -1016,18 +1023,35 @@ def follow_import(%User{} = follower, followed_identifiers) when is_list(followe
       ])
 
   def delete_user_activities(%User{ap_id: ap_id} = user) do
-    stream =
-      ap_id
-      |> Activity.query_by_actor()
-      |> Repo.stream()
-
-    Repo.transaction(fn -> Enum.each(stream, &delete_activity(&1)) end, timeout: :infinity)
+    ap_id
+    |> Activity.query_by_actor()
+    |> RepoStreamer.chunk_stream(50)
+    |> Stream.each(fn activities ->
+      Enum.each(activities, &delete_activity(&1))
+    end)
+    |> Stream.run()
 
     {:ok, user}
   end
 
   defp delete_activity(%{data: %{"type" => "Create"}} = activity) do
-    Object.normalize(activity) |> ActivityPub.delete()
+    activity
+    |> Object.normalize()
+    |> ActivityPub.delete()
+  end
+
+  defp delete_activity(%{data: %{"type" => "Like"}} = activity) do
+    user = get_cached_by_ap_id(activity.actor)
+    object = Object.normalize(activity)
+
+    ActivityPub.unlike(user, object)
+  end
+
+  defp delete_activity(%{data: %{"type" => "Announce"}} = activity) do
+    user = get_cached_by_ap_id(activity.actor)
+    object = Object.normalize(activity)
+
+    ActivityPub.unannounce(user, object)
   end
 
   defp delete_activity(_activity), do: "Doing nothing"

lib/pleroma/web/activity_pub/utils.ex

@@ -151,16 +151,18 @@ def get_notified_from_object(object) do
 
   def create_context(context) do
     context = context || generate_id("contexts")
-    changeset = Object.context_mapping(context)
 
-    case Repo.insert(changeset) do
-      {:ok, object} ->
-        object
+    # Ecto has problems accessing the constraint inside the jsonb,
+    # so we explicitly check for the existed object before insert
+    object = Object.get_cached_by_ap_id(context)
 
-      # This should be solved by an upsert, but it seems ecto
-      # has problems accessing the constraint inside the jsonb.
-      {:error, _} ->
-        Object.get_cached_by_ap_id(context)
+    with true <- is_nil(object),
+         changeset <- Object.context_mapping(context),
+         {:ok, inserted_object} <- Repo.insert(changeset) do
+      inserted_object
+    else
+      _ ->
+        object
     end
   end
 

test/tasks/user_test.exs

@@ -89,8 +89,7 @@ test "user is deleted" do
       assert_received {:mix_shell, :info, [message]}
       assert message =~ " deleted"
 
-      user = User.get_cached_by_nickname(user.nickname)
-      assert user.info.deactivated
+      refute User.get_by_nickname(user.nickname)
     end
 
     test "no user to delete" do

test/user_test.exs

@@ -920,42 +920,44 @@ test ".delete_user_activities deletes all create activities" do
 
     {:ok, activity} = CommonAPI.post(user, %{"status" => "2hu"})
 
-    Ecto.Adapters.SQL.Sandbox.unboxed_run(Repo, fn ->
-      {:ok, _} = User.delete_user_activities(user)
-      # TODO: Remove favorites, repeats, delete activities.
-      refute Activity.get_by_id(activity.id)
-    end)
+    {:ok, _} = User.delete_user_activities(user)
+
+    # TODO: Remove favorites, repeats, delete activities.
+    refute Activity.get_by_id(activity.id)
   end
 
-  test ".delete deactivates a user, all follow relationships and all create activities" do
+  test ".delete deactivates a user, all follow relationships and all activities" do
     user = insert(:user)
-    followed = insert(:user)
     follower = insert(:user)
 
-    {:ok, user} = User.follow(user, followed)
     {:ok, follower} = User.follow(follower, user)
 
     {:ok, activity} = CommonAPI.post(user, %{"status" => "2hu"})
     {:ok, activity_two} = CommonAPI.post(follower, %{"status" => "3hu"})
 
-    {:ok, _, _} = CommonAPI.favorite(activity_two.id, user)
-    {:ok, _, _} = CommonAPI.favorite(activity.id, follower)
-    {:ok, _, _} = CommonAPI.repeat(activity.id, follower)
+    {:ok, like, _} = CommonAPI.favorite(activity_two.id, user)
+    {:ok, like_two, _} = CommonAPI.favorite(activity.id, follower)
+    {:ok, repeat, _} = CommonAPI.repeat(activity_two.id, user)
 
     {:ok, _} = User.delete(user)
 
-    followed = User.get_cached_by_id(followed.id)
     follower = User.get_cached_by_id(follower.id)
-    user = User.get_cached_by_id(user.id)
 
-    assert user.info.deactivated
+    refute User.following?(follower, user)
+    refute User.get_by_id(user.id)
 
-    refute User.following?(user, followed)
-    refute User.following?(followed, follower)
+    user_activities =
+      user.ap_id
+      |> Activity.query_by_actor()
+      |> Repo.all()
+      |> Enum.map(fn act -> act.data["type"] end)
 
-    # TODO: Remove favorites, repeats, delete activities.
+    assert Enum.all?(user_activities, fn act -> act in ~w(Delete Undo) end)
 
     refute Activity.get_by_id(activity.id)
+    refute Activity.get_by_id(like.id)
+    refute Activity.get_by_id(like_two.id)
+    refute Activity.get_by_id(repeat.id)
   end
 
   test "get_public_key_for_ap_id fetches a user that's not in the db" do