139 lines
4.1 KiB
Elixir
139 lines
4.1 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Migrators.ContextObjectsDeletionMigrator do
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defmodule State do
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use Pleroma.Migrators.Support.BaseMigratorState
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@impl Pleroma.Migrators.Support.BaseMigratorState
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defdelegate data_migration(), to: Pleroma.DataMigration, as: :delete_context_objects
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end
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use Pleroma.Migrators.Support.BaseMigrator
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alias Pleroma.Migrators.Support.BaseMigrator
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alias Pleroma.Object
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@doc "This migration removes objects created exclusively for contexts, containing only an `id` field."
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@impl BaseMigrator
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def feature_config_path, do: [:features, :delete_context_objects]
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@impl BaseMigrator
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def fault_rate_allowance, do: Config.get([:delete_context_objects, :fault_rate_allowance], 0)
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@impl BaseMigrator
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def perform do
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data_migration_id = data_migration_id()
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max_processed_id = get_stat(:max_processed_id, 0)
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Logger.info("Deleting context objects from `objects` (from oid: #{max_processed_id})...")
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query()
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|> where([object], object.id > ^max_processed_id)
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|> Repo.chunk_stream(100, :batches, timeout: :infinity)
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|> Stream.each(fn objects ->
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object_ids = Enum.map(objects, & &1.id)
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results = Enum.map(object_ids, &delete_context_object(&1))
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failed_ids =
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results
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|> Enum.filter(&(elem(&1, 0) == :error))
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|> Enum.map(&elem(&1, 1))
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chunk_affected_count =
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results
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|> Enum.filter(&(elem(&1, 0) == :ok))
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|> length()
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for failed_id <- failed_ids do
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_ =
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Repo.query(
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"INSERT INTO data_migration_failed_ids(data_migration_id, record_id) " <>
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"VALUES ($1, $2) ON CONFLICT DO NOTHING;",
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[data_migration_id, failed_id]
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)
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end
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_ =
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Repo.query(
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"DELETE FROM data_migration_failed_ids " <>
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"WHERE data_migration_id = $1 AND record_id = ANY($2)",
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[data_migration_id, object_ids -- failed_ids]
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)
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max_object_id = Enum.at(object_ids, -1)
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put_stat(:max_processed_id, max_object_id)
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increment_stat(:iteration_processed_count, length(object_ids))
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increment_stat(:processed_count, length(object_ids))
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increment_stat(:failed_count, length(failed_ids))
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increment_stat(:affected_count, chunk_affected_count)
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put_stat(:records_per_second, records_per_second())
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persist_state()
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# A quick and dirty approach to controlling the load this background migration imposes
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sleep_interval = Config.get([:delete_context_objects, :sleep_interval_ms], 0)
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Process.sleep(sleep_interval)
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end)
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|> Stream.run()
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end
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@impl BaseMigrator
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def query do
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# Context objects have no activity type, and only one field, `id`.
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# Only those context objects are without types.
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from(
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object in Object,
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where: fragment("(?)->'type' IS NULL", object.data),
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select: %{
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id: object.id
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}
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)
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end
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@spec delete_context_object(integer()) :: {:ok | :error, integer()}
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defp delete_context_object(id) do
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result =
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%Object{id: id}
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|> Repo.delete()
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|> elem(0)
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{result, id}
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end
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@impl BaseMigrator
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def retry_failed do
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data_migration_id = data_migration_id()
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failed_objects_query()
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|> Repo.chunk_stream(100, :one)
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|> Stream.each(fn object ->
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with {res, _} when res != :error <- delete_context_object(object.id) do
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_ =
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Repo.query(
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"DELETE FROM data_migration_failed_ids " <>
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"WHERE data_migration_id = $1 AND record_id = $2",
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[data_migration_id, object.id]
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)
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end
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end)
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|> Stream.run()
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put_stat(:failed_count, failures_count())
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persist_state()
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force_continue()
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end
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defp failed_objects_query do
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from(o in Object)
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|> join(:inner, [o], dmf in fragment("SELECT * FROM data_migration_failed_ids"),
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on: dmf.record_id == o.id
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)
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|> where([_o, dmf], dmf.data_migration_id == ^data_migration_id())
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|> order_by([o], asc: o.id)
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end
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end
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