[#3213] Performance optimization of filtering by hashtags ("any" condition).
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@ -93,6 +93,7 @@ defmodule Pleroma.Pagination do
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max_id: :string,
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offset: :integer,
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limit: :integer,
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skip_extra_order: :boolean,
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skip_order: :boolean
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}
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@ -114,6 +115,8 @@ defmodule Pleroma.Pagination do
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defp restrict(query, :order, %{skip_order: true}, _), do: query
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defp restrict(%{order_bys: [_ | _]} = query, :order, %{skip_extra_order: true}, _), do: query
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defp restrict(query, :order, %{min_id: _}, table_binding) do
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order_by(
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query,
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@ -466,6 +466,23 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
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|> Repo.one()
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end
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defp fetch_paginated_optimized(query, opts, pagination) do
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# Note: tag-filtering funcs may apply "ORDER BY objects.id DESC",
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# and extra sorting on "activities.id DESC NULLS LAST" would worse the query plan
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opts = Map.put(opts, :skip_extra_order, true)
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Pagination.fetch_paginated(query, opts, pagination)
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end
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def fetch_activities(recipients, opts \\ %{}, pagination \\ :keyset) do
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list_memberships = Pleroma.List.memberships(opts[:user])
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fetch_activities_query(recipients ++ list_memberships, opts)
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|> fetch_paginated_optimized(opts, pagination)
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|> Enum.reverse()
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|> maybe_update_cc(list_memberships, opts[:user])
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end
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@spec fetch_public_or_unlisted_activities(map(), Pagination.type()) :: [Activity.t()]
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def fetch_public_or_unlisted_activities(opts \\ %{}, pagination \\ :keyset) do
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opts = Map.delete(opts, :user)
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@ -473,7 +490,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
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[Constants.as_public()]
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|> fetch_activities_query(opts)
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|> restrict_unlisted(opts)
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|> Pagination.fetch_paginated(opts, pagination)
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|> fetch_paginated_optimized(opts, pagination)
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end
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@spec fetch_public_activities(map(), Pagination.type()) :: [Activity.t()]
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@ -751,6 +768,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
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|> join(:inner, [hto], ht in Pleroma.Hashtag, on: hto.hashtag_id == ht.id)
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|> where([hto, ht], ht.name in ^tags)
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|> select([hto], hto.object_id)
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|> distinct([hto], true)
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end
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defp restrict_hashtag_all(_query, %{tag_all: _tag, skip_preload: true}) do
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@ -789,9 +807,18 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
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end
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defp restrict_hashtag_any(query, %{tag: [_ | _] = tags}) do
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hashtag_ids =
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from(ht in Hashtag, where: ht.name in ^tags, select: ht.id)
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|> Repo.all()
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# Note: NO extra ordering should be done on "activities.id desc nulls last" for optimal plan
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from(
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[_activity, object] in query,
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where: object.id in subquery(object_ids_query_for_tags(tags))
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join: hto in "hashtags_objects",
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on: hto.object_id == object.id,
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where: hto.hashtag_id in ^hashtag_ids,
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distinct: [desc: object.id],
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order_by: [desc: object.id]
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)
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end
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@ -1188,7 +1215,12 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
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Map.put(opts, key, Hashtag.normalize_name(value))
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value when is_list(value) ->
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Map.put(opts, key, Enum.map(value, &Hashtag.normalize_name/1))
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normalized_value =
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value
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|> Enum.map(&Hashtag.normalize_name/1)
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|> Enum.uniq()
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Map.put(opts, key, normalized_value)
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_ ->
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opts
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@ -1275,15 +1307,6 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
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end
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end
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def fetch_activities(recipients, opts \\ %{}, pagination \\ :keyset) do
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list_memberships = Pleroma.List.memberships(opts[:user])
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fetch_activities_query(recipients ++ list_memberships, opts)
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|> Pagination.fetch_paginated(opts, pagination)
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|> Enum.reverse()
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|> maybe_update_cc(list_memberships, opts[:user])
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end
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@doc """
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Fetch favorites activities of user with order by sort adds to favorites
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"""
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@ -133,34 +133,25 @@ defmodule Pleroma.Web.MastodonAPI.TimelineController do
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end
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defp hashtag_fetching(params, user, local_only) do
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tags =
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# Note: not sanitizing tag options at this stage (may be mix-cased, have duplicates etc.)
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tags_any =
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[params[:tag], params[:any]]
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|> List.flatten()
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|> Enum.reject(&is_nil/1)
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|> Enum.map(&String.downcase/1)
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|> Enum.uniq()
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|> Enum.filter(& &1)
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tag_all =
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params
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|> Map.get(:all, [])
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|> Enum.map(&String.downcase/1)
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tag_all = Map.get(params, :all, [])
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tag_reject = Map.get(params, :none, [])
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tag_reject =
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params
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|> Map.get(:none, [])
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|> Enum.map(&String.downcase/1)
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_activities =
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params
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|> Map.put(:type, "Create")
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|> Map.put(:local_only, local_only)
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|> Map.put(:blocking_user, user)
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|> Map.put(:muting_user, user)
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|> Map.put(:user, user)
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|> Map.put(:tag, tags)
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|> Map.put(:tag_all, tag_all)
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|> Map.put(:tag_reject, tag_reject)
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|> ActivityPub.fetch_public_activities()
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params
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|> Map.put(:type, "Create")
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|> Map.put(:local_only, local_only)
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|> Map.put(:blocking_user, user)
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|> Map.put(:muting_user, user)
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|> Map.put(:user, user)
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|> Map.put(:tag, tags_any)
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|> Map.put(:tag_all, tag_all)
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|> Map.put(:tag_reject, tag_reject)
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|> ActivityPub.fetch_public_activities()
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end
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# GET /api/v1/timelines/tag/:tag
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