X-Git-Url: http://git.squeep.com/?a=blobdiff_plain;ds=sidebyside;f=lib%2Fpleroma%2Fpagination.ex;h=4535ca7c5c2b65d3d68b9acf469996ccfec8da51;hb=3ecf131511afc1fc366be6402ca94cf0e6c30e11;hp=f435e5c9cb43c0d262ef231d3a9985d2eab75a9b;hpb=a58813e7a14fda8eff2f2a659094444d20765e85;p=akkoma

diff --git a/lib/pleroma/pagination.ex b/lib/pleroma/pagination.ex
index f435e5c9c..4535ca7c5 100644
--- a/lib/pleroma/pagination.ex
+++ b/lib/pleroma/pagination.ex
@@ -1,3 +1,7 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Pagination do
   @moduledoc """
   Implements Mastodon-compatible pagination.
@@ -9,23 +13,66 @@ defmodule Pleroma.Pagination do
   alias Pleroma.Repo
 
   @default_limit 20
+  @page_keys ["max_id", "min_id", "limit", "since_id", "order"]
+
+  def page_keys, do: @page_keys
+
+  def fetch_paginated(query, params, type \\ :keyset, table_binding \\ nil)
+
+  def fetch_paginated(query, %{"total" => true} = params, :keyset, table_binding) do
+    total = Repo.aggregate(query, :count, :id)
+
+    %{
+      total: total,
+      items: fetch_paginated(query, Map.drop(params, ["total"]), :keyset, table_binding)
+    }
+  end
 
-  def fetch_paginated(query, params) do
+  def fetch_paginated(query, params, :keyset, table_binding) do
     options = cast_params(params)
 
     query
-    |> paginate(options)
+    |> paginate(options, :keyset, table_binding)
     |> Repo.all()
     |> enforce_order(options)
   end
 
-  def paginate(query, options) do
+  def fetch_paginated(query, %{"total" => true} = params, :offset, table_binding) do
+    total =
+      query
+      |> Ecto.Query.exclude(:left_join)
+      |> Repo.aggregate(:count, :id)
+
+    %{
+      total: total,
+      items: fetch_paginated(query, Map.drop(params, ["total"]), :offset, table_binding)
+    }
+  end
+
+  def fetch_paginated(query, params, :offset, table_binding) do
+    options = cast_params(params)
+
     query
-    |> restrict(:min_id, options)
-    |> restrict(:since_id, options)
-    |> restrict(:max_id, options)
-    |> restrict(:order, options)
-    |> restrict(:limit, options)
+    |> paginate(options, :offset, table_binding)
+    |> Repo.all()
+  end
+
+  def paginate(query, options, method \\ :keyset, table_binding \\ nil)
+
+  def paginate(query, options, :keyset, table_binding) do
+    query
+    |> restrict(:min_id, options, table_binding)
+    |> restrict(:since_id, options, table_binding)
+    |> restrict(:max_id, options, table_binding)
+    |> restrict(:order, options, table_binding)
+    |> restrict(:limit, options, table_binding)
+  end
+
+  def paginate(query, options, :offset, table_binding) do
+    query
+    |> restrict(:order, options, table_binding)
+    |> restrict(:offset, options, table_binding)
+    |> restrict(:limit, options, table_binding)
   end
 
   defp cast_params(params) do
@@ -33,7 +80,9 @@ defmodule Pleroma.Pagination do
       min_id: :string,
       since_id: :string,
       max_id: :string,
-      limit: :integer
+      offset: :integer,
+      limit: :integer,
+      skip_order: :boolean
     }
 
     params =
@@ -46,34 +95,48 @@ defmodule Pleroma.Pagination do
     changeset.changes
   end
 
-  defp restrict(query, :min_id, %{min_id: min_id}) do
-    where(query, [q], q.id > ^min_id)
+  defp restrict(query, :min_id, %{min_id: min_id}, table_binding) do
+    where(query, [{q, table_position(query, table_binding)}], q.id > ^min_id)
   end
 
-  defp restrict(query, :since_id, %{since_id: since_id}) do
-    where(query, [q], q.id > ^since_id)
+  defp restrict(query, :since_id, %{since_id: since_id}, table_binding) do
+    where(query, [{q, table_position(query, table_binding)}], q.id > ^since_id)
   end
 
-  defp restrict(query, :max_id, %{max_id: max_id}) do
-    where(query, [q], q.id < ^max_id)
+  defp restrict(query, :max_id, %{max_id: max_id}, table_binding) do
+    where(query, [{q, table_position(query, table_binding)}], q.id < ^max_id)
   end
 
-  defp restrict(query, :order, %{min_id: _}) do
-    order_by(query, [u], fragment("? asc nulls last", u.id))
+  defp restrict(query, :order, %{skip_order: true}, _), do: query
+
+  defp restrict(query, :order, %{min_id: _}, table_binding) do
+    order_by(
+      query,
+      [{u, table_position(query, table_binding)}],
+      fragment("? asc nulls last", u.id)
+    )
+  end
+
+  defp restrict(query, :order, _options, table_binding) do
+    order_by(
+      query,
+      [{u, table_position(query, table_binding)}],
+      fragment("? desc nulls last", u.id)
+    )
   end
 
-  defp restrict(query, :order, _options) do
-    order_by(query, [u], fragment("? desc nulls last", u.id))
+  defp restrict(query, :offset, %{offset: offset}, _table_binding) do
+    offset(query, ^offset)
   end
 
-  defp restrict(query, :limit, options) do
+  defp restrict(query, :limit, options, _table_binding) do
     limit = Map.get(options, :limit, @default_limit)
 
     query
     |> limit(^limit)
   end
 
-  defp restrict(query, _, _), do: query
+  defp restrict(query, _, _, _), do: query
 
   defp enforce_order(result, %{min_id: _}) do
     result
@@ -81,4 +144,10 @@ defmodule Pleroma.Pagination do
   end
 
   defp enforce_order(result, _), do: result
+
+  defp table_position(%Ecto.Query{} = query, binding_name) do
+    Map.get(query.aliases, binding_name, 0)
+  end
+
+  defp table_position(_, _), do: 0
 end