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