[#3213] ActivityPub: implemented subqueries-based hashtags filtering, removed aggregation-based hashtags filtering.
This commit is contained in:
Ivan Tashkinov
parent
9948ff3356
commit
6fd4163ab6
3 changed files with 81 additions and 154 deletions
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@ -940,7 +940,7 @@
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key: :improved_hashtag_timeline,
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type: :keyword,
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description:
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"If `true` / `:prefer_aggregation`, hashtags table and selected strategy will be used for hashtags timeline. When `false`, object-embedded hashtags will be used (slower). Is auto-set to `true` (unless overridden) when HashtagsTableMigrator completes."
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"If `true`, hashtags will be fetched from `hashtags` table for hashtags timeline. When `false`, object-embedded hashtags will be used (slower). Is auto-set to `true` (unless overridden) when HashtagsTableMigrator completes."
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}
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]
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},
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@ -669,24 +669,6 @@ defp restrict_since(query, %{since_id: since_id}) do
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defp restrict_since(query, _), do: query
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defp restrict_embedded_tag_reject(_query, %{tag_reject: _tag_reject, skip_preload: true}) do
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raise_on_missing_preload()
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end
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defp restrict_embedded_tag_reject(query, %{tag_reject: tag_reject}) when is_list(tag_reject) do
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from(
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[_activity, object] in query,
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where: fragment("not (?)->'tag' \\?| (?)", object.data, ^tag_reject)
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)
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end
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defp restrict_embedded_tag_reject(query, %{tag_reject: tag_reject})
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when is_binary(tag_reject) do
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restrict_embedded_tag_reject(query, %{tag_reject: [tag_reject]})
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end
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defp restrict_embedded_tag_reject(query, _), do: query
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defp restrict_embedded_tag_all(_query, %{tag_all: _tag_all, skip_preload: true}) do
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raise_on_missing_preload()
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end
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@ -699,139 +681,65 @@ defp restrict_embedded_tag_all(query, %{tag_all: tag_all}) when is_list(tag_all)
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end
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defp restrict_embedded_tag_all(query, %{tag_all: tag}) when is_binary(tag) do
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restrict_embedded_tag(query, %{tag: tag})
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restrict_embedded_tag_any(query, %{tag: tag})
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end
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defp restrict_embedded_tag_all(query, _), do: query
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defp restrict_embedded_tag(_query, %{tag: _tag, skip_preload: true}) do
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defp restrict_embedded_tag_any(_query, %{tag: _tag, skip_preload: true}) do
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raise_on_missing_preload()
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end
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defp restrict_embedded_tag(query, %{tag: tag}) when is_list(tag) do
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defp restrict_embedded_tag_any(query, %{tag: tag}) when is_list(tag) do
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from(
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[_activity, object] in query,
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where: fragment("(?)->'tag' \\?| (?)", object.data, ^tag)
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)
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end
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defp restrict_embedded_tag(query, %{tag: tag}) when is_binary(tag) do
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restrict_embedded_tag(query, %{tag: [tag]})
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defp restrict_embedded_tag_any(query, %{tag: tag}) when is_binary(tag) do
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restrict_embedded_tag_any(query, %{tag: [tag]})
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end
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defp restrict_embedded_tag(query, _), do: query
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defp restrict_embedded_tag_any(query, _), do: query
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defp hashtag_conditions(opts) do
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[:tag, :tag_all, :tag_reject]
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|> Enum.map(&opts[&1])
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|> Enum.map(&List.wrap(&1))
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end
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# Note: times out on larger instances (with default timeout), intended for complex queries
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defp restrict_hashtag_agg(query, opts) do
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[tag_any, tag_all, tag_reject] = hashtag_conditions(opts)
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has_conditions = Enum.any?([tag_any, tag_all, tag_reject], &Enum.any?(&1))
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cond do
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!has_conditions ->
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query
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opts[:skip_preload] ->
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raise_on_missing_preload()
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true ->
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query
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|> group_by_all_bindings()
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|> join(:left, [_activity, object], hashtag in assoc(object, :hashtags), as: :hashtag)
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|> maybe_restrict_hashtag_any(tag_any)
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|> maybe_restrict_hashtag_all(tag_all)
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|> maybe_restrict_hashtag_reject_any(tag_reject)
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end
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end
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# Groups by all bindings to allow aggregation on hashtags
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defp group_by_all_bindings(query) do
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# Expecting named bindings: :object, :bookmark, :thread_mute, :report_note
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cond do
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Enum.count(query.aliases) == 4 ->
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from([a, o, b3, b4, b5] in query, group_by: [a.id, o.id, b3.id, b4.id, b5.id])
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Enum.count(query.aliases) == 3 ->
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from([a, o, b3, b4] in query, group_by: [a.id, o.id, b3.id, b4.id])
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Enum.count(query.aliases) == 2 ->
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from([a, o, b3] in query, group_by: [a.id, o.id, b3.id])
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true ->
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from([a, o] in query, group_by: [a.id, o.id])
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end
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end
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defp maybe_restrict_hashtag_any(query, []) do
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query
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end
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defp maybe_restrict_hashtag_any(query, tags) do
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having(
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query,
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[hashtag: hashtag],
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fragment("array_agg(?) && (?)", hashtag.name, ^tags)
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)
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end
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defp maybe_restrict_hashtag_all(query, []) do
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query
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end
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defp maybe_restrict_hashtag_all(query, tags) do
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having(
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query,
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[hashtag: hashtag],
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fragment("array_agg(?) @> (?)", hashtag.name, ^tags)
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)
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end
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defp maybe_restrict_hashtag_reject_any(query, []) do
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query
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end
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defp maybe_restrict_hashtag_reject_any(query, tags) do
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having(
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query,
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[hashtag: hashtag],
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fragment("not(array_agg(?) && (?))", hashtag.name, ^tags)
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)
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end
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defp restrict_hashtag_reject_any(_query, %{tag_reject: _tag_reject, skip_preload: true}) do
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defp restrict_embedded_tag_reject_any(_query, %{tag_reject: _tag_reject, skip_preload: true}) do
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raise_on_missing_preload()
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end
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defp restrict_hashtag_reject_any(query, %{tag_reject: tags_reject}) when is_list(tags_reject) do
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query
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|> group_by_all_bindings()
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|> join(:left, [_activity, object], hashtag in assoc(object, :hashtags), as: :hashtag)
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|> having(
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[hashtag: hashtag],
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fragment("not(array_agg(?) && (?))", hashtag.name, ^tags_reject)
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defp restrict_embedded_tag_reject_any(query, %{tag_reject: tag_reject})
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when is_list(tag_reject) do
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from(
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[_activity, object] in query,
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where: fragment("not (?)->'tag' \\?| (?)", object.data, ^tag_reject)
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)
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end
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defp restrict_hashtag_reject_any(query, %{tag_reject: tag_reject}) when is_binary(tag_reject) do
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restrict_hashtag_reject_any(query, %{tag_reject: [tag_reject]})
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defp restrict_embedded_tag_reject_any(query, %{tag_reject: tag_reject})
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when is_binary(tag_reject) do
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restrict_embedded_tag_reject_any(query, %{tag_reject: [tag_reject]})
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end
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defp restrict_hashtag_reject_any(query, _), do: query
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defp restrict_embedded_tag_reject_any(query, _), do: query
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defp restrict_hashtag_all(_query, %{tag_all: _tag, skip_preload: true}) do
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raise_on_missing_preload()
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end
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defp restrict_hashtag_all(query, %{tag_all: tags}) when is_list(tags) do
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Enum.reduce(
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tags,
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query,
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fn tag, acc -> restrict_hashtag_any(acc, %{tag: tag}) end
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from(
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[_activity, object] in query,
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where:
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fragment(
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"""
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(SELECT array_agg(hashtags.name) FROM hashtags JOIN hashtags_objects
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ON hashtags_objects.hashtag_id = hashtags.id WHERE hashtags.name = ANY(?)
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AND hashtags_objects.object_id = ?) @> ?
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""",
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^tags,
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object.id,
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^tags
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)
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)
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end
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@ -846,18 +754,19 @@ defp restrict_hashtag_any(_query, %{tag: _tag, skip_preload: true}) do
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end
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defp restrict_hashtag_any(query, %{tag: tags}) when is_list(tags) do
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query =
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from(
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[_activity, object] in query,
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join: hashtag in assoc(object, :hashtags),
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where: hashtag.name in ^tags
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where:
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fragment(
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"""
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EXISTS (SELECT 1 FROM hashtags JOIN hashtags_objects
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ON hashtags_objects.hashtag_id = hashtags.id WHERE hashtags.name = ANY(?)
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AND hashtags_objects.object_id = ? LIMIT 1)
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""",
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^tags,
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object.id
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)
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)
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if length(tags) > 1 do
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distinct(query, [activity], true)
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else
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query
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end
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end
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defp restrict_hashtag_any(query, %{tag: tag}) when is_binary(tag) do
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@ -866,6 +775,32 @@ defp restrict_hashtag_any(query, %{tag: tag}) when is_binary(tag) do
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defp restrict_hashtag_any(query, _), do: query
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defp restrict_hashtag_reject_any(_query, %{tag_reject: _tag_reject, skip_preload: true}) do
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raise_on_missing_preload()
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end
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defp restrict_hashtag_reject_any(query, %{tag_reject: tags_reject}) when is_list(tags_reject) do
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from(
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[_activity, object] in query,
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where:
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fragment(
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"""
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NOT EXISTS (SELECT 1 FROM hashtags JOIN hashtags_objects
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ON hashtags_objects.hashtag_id = hashtags.id WHERE hashtags.name = ANY(?)
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AND hashtags_objects.object_id = ? LIMIT 1)
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""",
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^tags_reject,
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object.id
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)
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)
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end
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defp restrict_hashtag_reject_any(query, %{tag_reject: tag_reject}) when is_binary(tag_reject) do
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restrict_hashtag_reject_any(query, %{tag_reject: [tag_reject]})
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end
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defp restrict_hashtag_reject_any(query, _), do: query
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defp raise_on_missing_preload do
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raise "Can't use the child object without preloading!"
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end
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@ -1286,23 +1221,16 @@ def fetch_activities_query(recipients, opts \\ %{}) do
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|> exclude_invisible_actors(opts)
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|> exclude_visibility(opts)
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hashtag_timeline_strategy = Config.improved_hashtag_timeline()
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cond do
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!hashtag_timeline_strategy ->
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query
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|> restrict_embedded_tag(opts)
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|> restrict_embedded_tag_reject(opts)
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|> restrict_embedded_tag_all(opts)
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hashtag_timeline_strategy == :prefer_aggregation ->
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restrict_hashtag_agg(query, opts)
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true ->
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if Config.improved_hashtag_timeline() do
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query
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|> restrict_hashtag_any(opts)
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|> restrict_hashtag_all(opts)
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|> restrict_hashtag_reject_any(opts)
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else
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query
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|> restrict_embedded_tag_any(opts)
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|> restrict_embedded_tag_all(opts)
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|> restrict_embedded_tag_reject_any(opts)
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end
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end
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@ -220,7 +220,7 @@ test "it fetches the appropriate tag-restricted posts" do
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{:ok, status_four} = CommonAPI.post(user, %{status: ". #any1 #any2"})
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{:ok, status_five} = CommonAPI.post(user, %{status: ". #any2 #any1"})
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for hashtag_timeline_strategy <- [true, :prefer_aggregation, false] do
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for hashtag_timeline_strategy <- [true, false] do
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clear_config([:instance, :improved_hashtag_timeline], hashtag_timeline_strategy)
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fetch_one = ActivityPub.fetch_activities([], %{type: "Create", tag: "test"})
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@ -241,8 +241,7 @@ test "it fetches the appropriate tag-restricted posts" do
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tag_all: ["test", "reject"]
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})
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# This test would fail if JOIN with 2+ terms in "any" clause is done without DISTINCT.
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# The :limit is important (w/o DISTINCT 2 records are deduped by Ecto to 1 b/c of preload).
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# Testing that deduplication (if needed) is done on DB (not Ecto) level; :limit is important
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fetch_five =
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ActivityPub.fetch_activities([], %{
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type: "Create",
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