added an endpoint for getting unread notification count

3 files changed, 82 insertions, 15 deletions

diff --git a/lib/pleroma/marker.ex b/lib/pleroma/marker.ex
index 443927392..4d82860f5 100644
--- a/lib/pleroma/marker.ex
+++ b/lib/pleroma/marker.ex
@@ -9,24 +9,34 @@ defmodule Pleroma.Marker do
   import Ecto.Query
 
   alias Ecto.Multi
+  alias Pleroma.Notification
   alias Pleroma.Repo
   alias Pleroma.User
+  alias __MODULE__
 
   @timelines ["notifications"]
+  @type t :: %__MODULE__{}
 
   schema "markers" do
     field(:last_read_id, :string, default: "")
     field(:timeline, :string, default: "")
     field(:lock_version, :integer, default: 0)
+    field(:unread_count, :integer, default: 0, virtual: true)
 
     belongs_to(:user, User, type: FlakeId.Ecto.CompatType)
     timestamps()
   end
 
+  @doc "Gets markers by user and timeline."
+  @spec get_markers(User.t(), list(String)) :: list(t())
   def get_markers(user, timelines \\ []) do
-    Repo.all(get_query(user, timelines))
+    user
+    |> get_query(timelines)
+    |> unread_count_query()
+    |> Repo.all()
   end
 
+  @spec upsert(User.t(), map()) :: {:ok | :error, any()}
   def upsert(%User{} = user, attrs) do
     attrs
     |> Map.take(@timelines)
@@ -45,6 +55,27 @@ defmodule Pleroma.Marker do
     |> Repo.transaction()
   end
 
+  @spec multi_set_last_read_id(Multi.t(), User.t(), String.t()) :: Multi.t()
+  def multi_set_last_read_id(multi, %User{} = user, "notifications") do
+    multi
+    |> Multi.run(:counters, fn _repo, _changes ->
+      {:ok, %{last_read_id: Repo.one(Notification.last_read_query(user))}}
+    end)
+    |> Multi.insert(
+      :marker,
+      fn %{counters: attrs} ->
+        %Marker{timeline: "notifications", user_id: user.id}
+        |> struct(attrs)
+        |> Ecto.Changeset.change()
+      end,
+      returning: true,
+      on_conflict: {:replace, [:last_read_id]},
+      conflict_target: [:user_id, :timeline]
+    )
+  end
+
+  def multi_set_last_read_id(multi, _, _), do: multi
+
   defp get_marker(user, timeline) do
     case Repo.find_resource(get_query(user, timeline)) do
       {:ok, marker} -> %__MODULE__{marker | user: user}
@@ -71,4 +102,16 @@ defmodule Pleroma.Marker do
     |> by_user_id(user.id)
     |> by_timeline(timelines)
   end
+
+  defp unread_count_query(query) do
+    from(
+      q in query,
+      left_join: n in "notifications",
+      on: n.user_id == q.user_id and n.seen == false,
+      group_by: [:id],
+      select_merge: %{
+        unread_count: fragment("count(?)", n.id)
+      }
+    )
+  end
 end
diff --git a/lib/pleroma/notification.ex b/lib/pleroma/notification.ex
index 04ee510b9..3084bac3b 100644
--- a/lib/pleroma/notification.ex
+++ b/lib/pleroma/notification.ex
@@ -5,7 +5,9 @@
 defmodule Pleroma.Notification do
   use Ecto.Schema
 
+  alias Ecto.Multi
   alias Pleroma.Activity
+  alias Pleroma.Marker
   alias Pleroma.Notification
   alias Pleroma.Object
   alias Pleroma.Pagination
@@ -38,6 +40,17 @@ defmodule Pleroma.Notification do
     |> cast(attrs, [:seen])
   end
 
+  @spec last_read_query(User.t()) :: Ecto.Queryable.t()
+  def last_read_query(user) do
+    from(q in Pleroma.Notification,
+      where: q.user_id == ^user.id,
+      where: q.seen == true,
+      select: type(q.id, :string),
+      limit: 1,
+      order_by: [desc: :id]
+    )
+  end
+
   defp for_user_query_ap_id_opts(user, opts) do
     ap_id_relationships =
       [:block] ++
@@ -186,25 +199,23 @@ defmodule Pleroma.Notification do
     |> Repo.all()
   end
 
-  def set_read_up_to(%{id: user_id} = _user, id) do
+  def set_read_up_to(%{id: user_id} = user, id) do
     query =
       from(
         n in Notification,
         where: n.user_id == ^user_id,
         where: n.id <= ^id,
         where: n.seen == false,
-        update: [
-          set: [
-            seen: true,
-            updated_at: ^NaiveDateTime.utc_now()
-          ]
-        ],
         # Ideally we would preload object and activities here
         # but Ecto does not support preloads in update_all
         select: n.id
       )
 
-    {_, notification_ids} = Repo.update_all(query, [])
+    {:ok, %{ids: {_, notification_ids}}} =
+      Multi.new()
+      |> Multi.update_all(:ids, query, set: [seen: true, updated_at: NaiveDateTime.utc_now()])
+      |> Marker.multi_set_last_read_id(user, "notifications")
+      |> Repo.transaction()
 
     Notification
     |> where([n], n.id in ^notification_ids)
@@ -221,11 +232,18 @@ defmodule Pleroma.Notification do
     |> Repo.all()
   end
 
+  @spec read_one(User.t(), String.t()) ::
+          {:ok, Notification.t()} | {:error, Ecto.Changeset.t()} | nil
   def read_one(%User{} = user, notification_id) do
     with {:ok, %Notification{} = notification} <- get(user, notification_id) do
-      notification
-      |> changeset(%{seen: true})
-      |> Repo.update()
+      Multi.new()
+      |> Multi.update(:update, changeset(notification, %{seen: true}))
+      |> Marker.multi_set_last_read_id(user, "notifications")
+      |> Repo.transaction()
+      |> case do
+        {:ok, %{update: notification}} -> {:ok, notification}
+        {:error, :update, changeset, _} -> {:error, changeset}
+      end
     end
   end
 
@@ -307,8 +325,11 @@ defmodule Pleroma.Notification do
   # TODO move to sql, too.
   def create_notification(%Activity{} = activity, %User{} = user, do_send \\ true) do
     unless skip?(activity, user) do
-      notification = %Notification{user_id: user.id, activity: activity}
-      {:ok, notification} = Repo.insert(notification)
+      {:ok, %{notification: notification}} =
+        Multi.new()
+        |> Multi.insert(:notification, %Notification{user_id: user.id, activity: activity})
+        |> Marker.multi_set_last_read_id(user, "notifications")
+        |> Repo.transaction()
 
       if do_send do
         Streamer.stream(["user", "user:notification"], notification)
diff --git a/lib/pleroma/web/mastodon_api/views/marker_view.ex b/lib/pleroma/web/mastodon_api/views/marker_view.ex
index 985368fe5..415dae93b 100644
--- a/lib/pleroma/web/mastodon_api/views/marker_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/marker_view.ex
@@ -10,7 +10,10 @@ defmodule Pleroma.Web.MastodonAPI.MarkerView do
       Map.put_new(acc, m.timeline, %{
         last_read_id: m.last_read_id,
         version: m.lock_version,
-        updated_at: NaiveDateTime.to_iso8601(m.updated_at)
+        updated_at: NaiveDateTime.to_iso8601(m.updated_at),
+        pleroma: %{
+          unread_count: m.unread_count
+        }
       })
     end)
   end