Add caching for payload serialization during fan-out (#19642)

pull/6/head
Eugen Rochko 2022-11-04 13:21:06 +01:00 committed by GitHub
parent b8f6f03956
commit 5f9e47be34
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5 changed files with 129 additions and 7 deletions

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@ -11,6 +11,7 @@ class InlineRenderer
case @template
when :status
serializer = REST::StatusSerializer
preload_associations_for_status
when :notification
serializer = REST::NotificationSerializer
when :conversation
@ -35,6 +36,16 @@ class InlineRenderer
private
def preload_associations_for_status
ActiveRecord::Associations::Preloader.new.preload(@object, {
active_mentions: :account,
reblog: {
active_mentions: :account,
},
})
end
def current_user
@current_account&.user
end

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@ -0,0 +1,47 @@
# frozen_string_literal: true
class StatusCacheHydrator
def initialize(status)
@status = status
end
def hydrate(account_id)
# The cache of the serialized hash is generated by the fan-out-on-write service
payload = Rails.cache.fetch("fan-out/#{@status.id}") { InlineRenderer.render(@status, nil, :status) }
# If we're delivering to the author who disabled the display of the application used to create the
# status, we need to hydrate the application, since it was not rendered for the basic payload
payload[:application] = ActiveModelSerializers::SerializableResource.new(@status.application, serializer: REST::StatusSerializer::ApplicationSerializer).as_json if payload[:application].nil? && @status.account_id == account_id
# We take advantage of the fact that some relationships can only occur with an original status, not
# the reblog that wraps it, so we can assume that some values are always false
if payload[:reblog]
payload[:favourited] = false
payload[:reblogged] = false
payload[:muted] = false
payload[:bookmarked] = false
payload[:pinned] = false
payload[:filtered] = CustomFilter.apply_cached_filters(CustomFilter.cached_filters_for(@status.reblog_of_id), @status.reblog).map { |filter| ActiveModelSerializers::SerializableResource.new(filter, serializer: REST::FilterResultSerializer).as_json }
# If the reblogged status is being delivered to the author who disabled the display of the application
# used to create the status, we need to hydrate it here too
payload[:reblog][:application] = ActiveModelSerializers::SerializableResource.new(@status.reblog.application, serializer: REST::StatusSerializer::ApplicationSerializer).as_json if payload[:reblog][:application].nil? && @status.reblog.account_id == account_id
payload[:reblog][:favourited] = Favourite.where(account_id: account_id, status_id: @status.reblog_of_id).exists?
payload[:reblog][:reblogged] = Status.where(account_id: account_id, reblog_of_id: @status.reblog_of_id).exists?
payload[:reblog][:muted] = ConversationMute.where(account_id: account_id, conversation_id: @status.reblog.conversation_id).exists?
payload[:reblog][:bookmarked] = Bookmark.where(account_id: account_id, status_id: @status.reblog_of_id).exists?
payload[:reblog][:pinned] = StatusPin.where(account_id: account_id, status_id: @status.reblog_of_id).exists?
payload[:reblog][:filtered] = payload[:filtered]
else
payload[:favourited] = Favourite.where(account_id: account_id, status_id: @status.id).exists?
payload[:reblogged] = Status.where(account_id: account_id, reblog_of_id: @status.id).exists?
payload[:muted] = ConversationMute.where(account_id: account_id, conversation_id: @status.conversation_id).exists?
payload[:bookmarked] = Bookmark.where(account_id: account_id, status_id: @status.id).exists?
payload[:pinned] = StatusPin.where(account_id: account_id, status_id: @status.id).exists?
payload[:filtered] = CustomFilter.apply_cached_filters(CustomFilter.cached_filters_for(@status.id), @status).map { |filter| ActiveModelSerializers::SerializableResource.new(filter, serializer: REST::FilterResultSerializer).as_json }
end
payload
end
end

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@ -14,6 +14,7 @@ class FanOutOnWriteService < BaseService
@options = options
check_race_condition!
warm_payload_cache!
fan_out_to_local_recipients!
fan_out_to_public_recipients! if broadcastable?
@ -135,13 +136,21 @@ class FanOutOnWriteService < BaseService
AccountConversation.add_status(@account, @status) unless update?
end
def warm_payload_cache!
Rails.cache.write("fan-out/#{@status.id}", rendered_status)
end
def anonymous_payload
@anonymous_payload ||= Oj.dump(
event: update? ? :'status.update' : :update,
payload: InlineRenderer.render(@status, nil, :status)
payload: rendered_status
)
end
def rendered_status
@rendered_status ||= InlineRenderer.render(@status, nil, :status)
end
def update?
@options[:update]
end

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@ -5,11 +5,12 @@ class PushUpdateWorker
include Redisable
def perform(account_id, status_id, timeline_id = nil, options = {})
@account = Account.find(account_id)
@status = Status.includes(active_mentions: :account, reblog: { active_mentions: :account }).find(status_id)
@timeline_id = timeline_id || "timeline:#{account.id}"
@status = Status.find(status_id)
@account_id = account_id
@timeline_id = timeline_id || "timeline:#{account_id}"
@options = options.symbolize_keys
render_payload!
publish!
rescue ActiveRecord::RecordNotFound
true
@ -17,14 +18,14 @@ class PushUpdateWorker
private
def payload
InlineRenderer.render(@status, @account, :status)
def render_payload!
@payload = StatusCacheHydrator.new(@status).hydrate(@account_id)
end
def message
Oj.dump(
event: update? ? :'status.update' : :update,
payload: payload,
payload: @payload,
queued_at: (Time.now.to_f * 1000.0).to_i
)
end

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@ -0,0 +1,54 @@
# frozen_string_literal: true
require 'rails_helper'
describe StatusCacheHydrator do
let(:status) { Fabricate(:status) }
let(:account) { Fabricate(:account) }
describe '#hydrate' do
subject { described_class.new(status).hydrate(account.id) }
let(:compare_to_hash) { InlineRenderer.render(status, account, :status) }
context 'when cache is warm' do
before do
Rails.cache.write("fan-out/#{status.id}", InlineRenderer.render(status, nil, :status))
end
it 'renders the same attributes as a full render' do
expect(subject).to include(compare_to_hash)
end
end
context 'when cache is cold' do
before do
Rails.cache.delete("fan-out/#{status.id}")
end
it 'renders the same attributes as a full render' do
expect(subject).to include(compare_to_hash)
end
end
context 'when account has favourited status' do
before do
FavouriteService.new.call(account, status)
end
it 'renders the same attributes as a full render' do
expect(subject).to include(compare_to_hash)
end
end
context 'when account has reblogged status' do
before do
ReblogService.new.call(account, status)
end
it 'renders the same attributes as a full render' do
expect(subject).to include(compare_to_hash)
end
end
end
end