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Improved performance of notification preloading (#15640)

* Improved performance of notification preloading

* Remove Cacheable from Notification

* Fix test
gh/stable
abcang 2021-02-01 05:24:57 +09:00 committed by GitHub
parent c8c764dd8b
commit 7ab53f221a
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4 changed files with 136 additions and 50 deletions

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@ -31,12 +31,13 @@ class Api::V1::NotificationsController < Api::BaseController
private
def load_notifications
cache_collection_paginated_by_id(
browserable_account_notifications,
Notification,
notifications = browserable_account_notifications.includes(from_account: :account_stat).to_a_paginated_by_id(
limit_param(DEFAULT_NOTIFICATIONS_LIMIT),
params_slice(:max_id, :since_id, :min_id)
)
Notification.preload_cache_collection_target_statuses(notifications) do |target_statuses|
cache_collection(target_statuses, Status)
end
end
def browserable_account_notifications

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@ -17,7 +17,6 @@ class Notification < ApplicationRecord
self.inheritance_column = nil
include Paginable
include Cacheable
LEGACY_TYPE_CLASS_MAP = {
'Mention' => :mention,
@ -38,7 +37,13 @@ class Notification < ApplicationRecord
poll
).freeze
STATUS_INCLUDES = [:account, :application, :preloadable_poll, :media_attachments, :tags, active_mentions: :account, reblog: [:account, :application, :preloadable_poll, :media_attachments, :tags, active_mentions: :account]].freeze
TARGET_STATUS_INCLUDES_BY_TYPE = {
status: :status,
reblog: [status: :reblog],
mention: [mention: :status],
favourite: [favourite: :status],
poll: [poll: :status],
}.freeze
belongs_to :account, optional: true
belongs_to :from_account, class_name: 'Account', optional: true
@ -65,8 +70,6 @@ class Notification < ApplicationRecord
end
}
cache_associated :from_account, status: STATUS_INCLUDES, mention: [status: STATUS_INCLUDES], favourite: [:account, status: STATUS_INCLUDES], follow: :account, follow_request: :account, poll: [status: STATUS_INCLUDES]
def type
@type ||= (super || LEGACY_TYPE_CLASS_MAP[activity_type]).to_sym
end
@ -87,22 +90,41 @@ class Notification < ApplicationRecord
end
class << self
def cache_ids
select(:id, :updated_at, :activity_type, :activity_id)
def preload_cache_collection_target_statuses(notifications, &_block)
notifications.group_by(&:type).each do |type, grouped_notifications|
associations = TARGET_STATUS_INCLUDES_BY_TYPE[type]
next unless associations
# Instead of using the usual `includes`, manually preload each type.
# If polymorphic associations are loaded with the usual `includes`, other types of associations will be loaded more.
ActiveRecord::Associations::Preloader.new.preload(grouped_notifications, associations)
end
def reload_stale_associations!(cached_items)
account_ids = (cached_items.map(&:from_account_id) + cached_items.filter_map { |item| item.target_status&.account_id }).uniq
unique_target_statuses = notifications.map(&:target_status).compact.uniq
# Call cache_collection in block
cached_statuses_by_id = yield(unique_target_statuses).index_by(&:id)
return if account_ids.empty?
notifications.each do |notification|
next if notification.target_status.nil?
accounts = Account.where(id: account_ids).includes(:account_stat).index_by(&:id)
cached_status = cached_statuses_by_id[notification.target_status.id]
cached_items.each do |item|
item.from_account = accounts[item.from_account_id]
item.target_status.account = accounts[item.target_status.account_id] if item.target_status
case notification.type
when :status
notification.status = cached_status
when :reblog
notification.status.reblog = cached_status
when :favourite
notification.favourite.status = cached_status
when :mention
notification.mention.status = cached_status
when :poll
notification.poll.status = cached_status
end
end
notifications
end
end
after_initialize :set_from_account

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@ -349,10 +349,6 @@ describe ApplicationController, type: :controller do
expect(C.new.cache_collection(raw, Object)).to eq raw
end
context 'Notification' do
include_examples 'cacheable', :notification, Notification
end
context 'Status' do
include_examples 'cacheable', :status, Status
end

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@ -56,47 +56,114 @@ RSpec.describe Notification, type: :model do
end
end
describe '.reload_stale_associations!' do
context 'account_ids are empty' do
let(:cached_items) { [] }
subject { described_class.reload_stale_associations!(cached_items) }
it 'returns nil' do
is_expected.to be nil
describe '.preload_cache_collection_target_statuses' do
subject do
described_class.preload_cache_collection_target_statuses(notifications) do |target_statuses|
# preload account for testing instead of using cache_collection
Status.preload(:account).where(id: target_statuses.map(&:id))
end
end
context 'account_ids are present' do
context 'notifications are empty' do
let(:notifications) { [] }
it 'returns []' do
is_expected.to eq []
end
end
context 'notifications are present' do
before do
allow(accounts_with_ids).to receive(:[]).with(stale_account1.id).and_return(account1)
allow(accounts_with_ids).to receive(:[]).with(stale_account2.id).and_return(account2)
allow(Account).to receive_message_chain(:where, :includes, :index_by).and_return(accounts_with_ids)
notifications.each(&:reload)
end
let(:cached_items) do
let(:mention) { Fabricate(:mention) }
let(:status) { Fabricate(:status) }
let(:reblog) { Fabricate(:status, reblog: Fabricate(:status)) }
let(:follow) { Fabricate(:follow) }
let(:follow_request) { Fabricate(:follow_request) }
let(:favourite) { Fabricate(:favourite) }
let(:poll) { Fabricate(:poll) }
let(:notifications) do
[
Fabricate(:notification, activity: Fabricate(:status)),
Fabricate(:notification, activity: Fabricate(:follow)),
Fabricate(:notification, type: :mention, activity: mention),
Fabricate(:notification, type: :status, activity: status),
Fabricate(:notification, type: :reblog, activity: reblog),
Fabricate(:notification, type: :follow, activity: follow),
Fabricate(:notification, type: :follow_request, activity: follow_request),
Fabricate(:notification, type: :favourite, activity: favourite),
Fabricate(:notification, type: :poll, activity: poll),
]
end
let(:stale_account1) { cached_items[0].from_account }
let(:stale_account2) { cached_items[1].from_account }
it 'preloads target status' do
# mention
expect(subject[0].type).to eq :mention
expect(subject[0].association(:mention)).to be_loaded
expect(subject[0].mention.association(:status)).to be_loaded
let(:account1) { Fabricate(:account) }
let(:account2) { Fabricate(:account) }
# status
expect(subject[1].type).to eq :status
expect(subject[1].association(:status)).to be_loaded
let(:accounts_with_ids) { { account1.id => account1, account2.id => account2 } }
# reblog
expect(subject[2].type).to eq :reblog
expect(subject[2].association(:status)).to be_loaded
expect(subject[2].status.association(:reblog)).to be_loaded
it 'reloads associations' do
expect(cached_items[0].from_account).to be stale_account1
expect(cached_items[1].from_account).to be stale_account2
# follow: nothing
expect(subject[3].type).to eq :follow
expect(subject[3].target_status).to be_nil
described_class.reload_stale_associations!(cached_items)
# follow_request: nothing
expect(subject[4].type).to eq :follow_request
expect(subject[4].target_status).to be_nil
expect(cached_items[0].from_account).to be account1
expect(cached_items[1].from_account).to be account2
# favourite
expect(subject[5].type).to eq :favourite
expect(subject[5].association(:favourite)).to be_loaded
expect(subject[5].favourite.association(:status)).to be_loaded
# poll
expect(subject[6].type).to eq :poll
expect(subject[6].association(:poll)).to be_loaded
expect(subject[6].poll.association(:status)).to be_loaded
end
it 'replaces to cached status' do
# mention
expect(subject[0].type).to eq :mention
expect(subject[0].target_status.association(:account)).to be_loaded
expect(subject[0].target_status).to eq mention.status
# status
expect(subject[1].type).to eq :status
expect(subject[1].target_status.association(:account)).to be_loaded
expect(subject[1].target_status).to eq status
# reblog
expect(subject[2].type).to eq :reblog
expect(subject[2].target_status.association(:account)).to be_loaded
expect(subject[2].target_status).to eq reblog.reblog
# follow: nothing
expect(subject[3].type).to eq :follow
expect(subject[3].target_status).to be_nil
# follow_request: nothing
expect(subject[4].type).to eq :follow_request
expect(subject[4].target_status).to be_nil
# favourite
expect(subject[5].type).to eq :favourite
expect(subject[5].target_status.association(:account)).to be_loaded
expect(subject[5].target_status).to eq favourite.status
# poll
expect(subject[6].type).to eq :poll
expect(subject[6].target_status.association(:account)).to be_loaded
expect(subject[6].target_status).to eq poll.status
end
end
end