X-Git-Url: https://git.squeep.com/?a=blobdiff_plain;f=lib%2Fpleroma%2Frepo.ex;h=1fca0fccb977ec27af3656d7f6e1c260b75d7399;hb=6a333ade7f0d8e096df017b6fb355fb4d39e393c;hp=f57e088bc288f321c11c62868ea5b363d77a702b;hpb=e82e73478e577782407bc8452d17925675d99d10;p=akkoma
diff --git a/lib/pleroma/repo.ex b/lib/pleroma/repo.ex
index f57e088bc..1fca0fccb 100644
--- a/lib/pleroma/repo.ex
+++ b/lib/pleroma/repo.ex
@@ -1,5 +1,5 @@
# Pleroma: A lightweight social networking server
-# Copyright © 2017-2019 Pleroma Authors
+# Copyright © 2017-2021 Pleroma Authors
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Repo do
@@ -8,9 +8,8 @@ defmodule Pleroma.Repo do
adapter: Ecto.Adapters.Postgres,
migration_timestamps: [type: :naive_datetime_usec]
- defmodule Instrumenter do
- use Prometheus.EctoInstrumenter
- end
+ import Ecto.Query
+ require Logger
@doc """
Dynamically loads the repository url from the
@@ -47,4 +46,50 @@ defmodule Pleroma.Repo do
_ -> {:error, :not_found}
end
end
+
+ @doc """
+ Returns a lazy enumerable that emits all entries from the data store matching the given query.
+
+ `returns_as` use to group records. use the `batches` option to fetch records in bulk.
+
+ ## Examples
+
+ # fetch records one-by-one
+ iex> Pleroma.Repo.chunk_stream(Pleroma.Activity.Queries.by_actor(ap_id), 500)
+
+ # fetch records in bulk
+ iex> Pleroma.Repo.chunk_stream(Pleroma.Activity.Queries.by_actor(ap_id), 500, :batches)
+ """
+ @spec chunk_stream(Ecto.Query.t(), integer(), atom()) :: Enumerable.t()
+ def chunk_stream(query, chunk_size, returns_as \\ :one, query_options \\ []) do
+ # We don't actually need start and end functions of resource streaming,
+ # but it seems to be the only way to not fetch records one-by-one and
+ # have individual records be the elements of the stream, instead of
+ # lists of records
+ Stream.resource(
+ fn -> 0 end,
+ fn
+ last_id ->
+ query
+ |> order_by(asc: :id)
+ |> where([r], r.id > ^last_id)
+ |> limit(^chunk_size)
+ |> all(query_options)
+ |> case do
+ [] ->
+ {:halt, last_id}
+
+ records ->
+ last_id = List.last(records).id
+
+ if returns_as == :one do
+ {records, last_id}
+ else
+ {[records], last_id}
+ end
+ end
+ end,
+ fn _ -> :ok end
+ )
+ end
end