# 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