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Change trending hashtags to not disappear instantly after midnight (#11712)

shrike
Eugen Rochko 2019-09-02 18:11:13 +02:00 committed by GitHub
parent ac6935b629
commit 70ddef2654
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10 changed files with 179 additions and 37 deletions
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2
app/controllers/admin/tags_controller.rb
View File

@ -57,7 +57,7 @@ module Admin
scope = scope.unreviewed if filter_params[:review] == 'unreviewed'
scope = scope.reviewed.order(reviewed_at: :desc) if filter_params[:review] == 'reviewed'
scope = scope.pending_review.order(requested_review_at: :desc) if filter_params[:review] == 'pending_review'
scope.order(score: :desc)
scope.order(max_score: :desc)
end
def filter_params

2
app/lib/feed_manager.rb
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@ -63,7 +63,7 @@ class FeedManager
reblog_key = key(type, account_id, 'reblogs')
# Remove any items past the MAX_ITEMS'th entry in our feed
redis.zremrangebyrank(timeline_key, '0', (-(FeedManager::MAX_ITEMS + 1)).to_s)
redis.zremrangebyrank(timeline_key, 0, -(FeedManager::MAX_ITEMS + 1))
# Get the score of the REBLOG_FALLOFF'th item in our feed, and stop
# tracking anything after it for deduplication purposes.

4
app/models/tag.rb
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@ -7,14 +7,14 @@
# name :string default(""), not null
# created_at :datetime not null
# updated_at :datetime not null
# score :integer
# usable :boolean
# trendable :boolean
# listable :boolean
# reviewed_at :datetime
# requested_review_at :datetime
# last_status_at :datetime
# last_trend_at :datetime
# max_score :float
# max_score_at :datetime
#
class Tag < ApplicationRecord

102
app/models/trending_tags.rb
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@ -7,6 +7,8 @@ class TrendingTags
THRESHOLD = 5
LIMIT = 10
REVIEW_THRESHOLD = 3
MAX_SCORE_COOLDOWN = 3.days.freeze
MAX_SCORE_HALFLIFE = 6.hours.freeze
class << self
include Redisable
@ -16,14 +18,75 @@ class TrendingTags
increment_historical_use!(tag.id, at_time)
increment_unique_use!(tag.id, account.id, at_time)
increment_vote!(tag, at_time)
increment_use!(tag.id, at_time)
tag.update(last_status_at: Time.now.utc) if tag.last_status_at.nil? || tag.last_status_at < 12.hours.ago
tag.update(last_trend_at: Time.now.utc) if trending?(tag) && (tag.last_trend_at.nil? || tag.last_trend_at < 12.hours.ago)
end
def update!(at_time = Time.now.utc)
tag_ids = redis.smembers("#{KEY}:used:#{at_time.beginning_of_day.to_i}") + redis.zrange(KEY, 0, -1)
tags = Tag.where(id: tag_ids.uniq)
# First pass to calculate scores and update the set
tags.each do |tag|
expected = redis.pfcount("activity:tags:#{tag.id}:#{(at_time - 1.day).beginning_of_day.to_i}:accounts").to_f
expected = 1.0 if expected.zero?
observed = redis.pfcount("activity:tags:#{tag.id}:#{at_time.beginning_of_day.to_i}:accounts").to_f
max_time = tag.max_score_at
max_score = tag.max_score
max_score = 0 if max_time.nil? || max_time < (at_time - MAX_SCORE_COOLDOWN)
score = begin
if expected > observed || observed < THRESHOLD
0
else
((observed - expected)**2) / expected
end
end
if score > max_score
max_score = score
max_time = at_time
# Not interested in triggering any callbacks for this
tag.update_columns(max_score: max_score, max_score_at: max_time)
end
decaying_score = max_score * (0.5**((at_time.to_f - max_time.to_f) / MAX_SCORE_HALFLIFE.to_f))
if decaying_score.zero?
redis.zrem(KEY, tag.id)
else
redis.zadd(KEY, decaying_score, tag.id)
end
end
users_for_review = User.staff.includes(:account).to_a.select(&:allows_trending_tag_emails?)
# Second pass to notify about previously unreviewed trends
tags.each do |tag|
current_rank = redis.zrevrank(KEY, tag.id)
needs_review_notification = tag.requires_review? && !tag.requested_review?
rank_passes_threshold = current_rank.present? && current_rank <= REVIEW_THRESHOLD
next unless !tag.trendable? && rank_passes_threshold && needs_review_notification
tag.touch(:requested_review_at)
users_for_review.each do |user|
AdminMailer.new_trending_tag(user.account, tag).deliver_later!
end
end
# Trim older items
redis.zremrangebyrank(KEY, 0, -(LIMIT + 1))
end
def get(limit, filtered: true)
tag_ids = redis.zrevrange("#{KEY}:#{Time.now.utc.beginning_of_day.to_i}", 0, LIMIT - 1).map(&:to_i)
tag_ids = redis.zrevrange(KEY, 0, LIMIT - 1).map(&:to_i)
tags = Tag.where(id: tag_ids)
tags = tags.where(trendable: true) if filtered
@ -33,8 +96,8 @@ class TrendingTags
end
def trending?(tag)
rank = redis.zrevrank("#{KEY}:#{Time.now.utc.beginning_of_day.to_i}", tag.id)
rank.present? && rank <= LIMIT
rank = redis.zrevrank(KEY, tag.id)
rank.present? && rank < LIMIT
end
private
@ -51,31 +114,10 @@ class TrendingTags
redis.expire(key, EXPIRE_HISTORY_AFTER)
end
def increment_vote!(tag, at_time)
key = "#{KEY}:#{at_time.beginning_of_day.to_i}"
expected = redis.pfcount("activity:tags:#{tag.id}:#{(at_time - 1.day).beginning_of_day.to_i}:accounts").to_f
expected = 1.0 if expected.zero?
observed = redis.pfcount("activity:tags:#{tag.id}:#{at_time.beginning_of_day.to_i}:accounts").to_f
if expected > observed || observed < THRESHOLD
redis.zrem(key, tag.id)
else
score = ((observed - expected)**2) / expected
old_rank = redis.zrevrank(key, tag.id)
redis.zadd(key, score, tag.id)
request_review!(tag) if (old_rank.nil? || old_rank > REVIEW_THRESHOLD) && redis.zrevrank(key, tag.id) <= REVIEW_THRESHOLD && !tag.trendable? && tag.requires_review? && !tag.requested_review?
end
redis.expire(key, EXPIRE_TRENDS_AFTER)
end
def request_review!(tag)
return unless Setting.trends
tag.touch(:requested_review_at)
User.staff.includes(:account).find_each { |u| AdminMailer.new_trending_tag(u.account, tag).deliver_later! if u.allows_trending_tag_emails? }
def increment_use!(tag_id, at_time)
key = "#{KEY}:used:#{at_time.beginning_of_day.to_i}"
redis.sadd(key, tag_id)
redis.expire(key, EXPIRE_HISTORY_AFTER)
end
end
end

11
app/workers/scheduler/trending_tags_scheduler.rb Normal file
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@ -0,0 +1,11 @@
# frozen_string_literal: true
class Scheduler::TrendingTagsScheduler
include Sidekiq::Worker
sidekiq_options unique: :until_executed, retry: 0
def perform
TrendingTags.update! if Setting.trends
end
end

3
config/sidekiq.yml
View File

@ -9,6 +9,9 @@
scheduled_statuses_scheduler:
every: '5m'
class: Scheduler::ScheduledStatusesScheduler
trending_tags_scheduler:
every: '5m'
class: Scheduler::TrendingTagsScheduler
media_cleanup_scheduler:
cron: '<%= Random.rand(0..59) %> <%= Random.rand(3..5) %> * * *'
class: Scheduler::MediaCleanupScheduler

6
db/migrate/20190901035623_add_max_score_to_tags.rb Normal file
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@ -0,0 +1,6 @@
class AddMaxScoreToTags < ActiveRecord::Migration[5.2]
def change
add_column :tags, :max_score, :float
add_column :tags, :max_score_at, :datetime
end
end

12
db/post_migrate/20190901040524_remove_score_from_tags.rb Normal file
View File

@ -0,0 +1,12 @@
# frozen_string_literal: true
class RemoveScoreFromTags < ActiveRecord::Migration[5.2]
disable_ddl_transaction!
def change
safety_assured do
remove_column :tags, :score, :int
remove_column :tags, :last_trend_at, :datetime
end
end
end

6
db/schema.rb
View File

@ -10,7 +10,7 @@
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 2019_08_23_221802) do
ActiveRecord::Schema.define(version: 2019_09_01_040524) do
# These are extensions that must be enabled in order to support this database
enable_extension "plpgsql"
@ -664,14 +664,14 @@ ActiveRecord::Schema.define(version: 2019_08_23_221802) do
t.string "name", default: "", null: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "score"
t.boolean "usable"
t.boolean "trendable"
t.boolean "listable"
t.datetime "reviewed_at"
t.datetime "requested_review_at"
t.datetime "last_status_at"
t.datetime "last_trend_at"
t.float "max_score"
t.datetime "max_score_at"
t.index "lower((name)::text)", name: "index_tags_on_name_lower", unique: true
end

68
spec/models/trending_tags_spec.rb Normal file
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@ -0,0 +1,68 @@
require 'rails_helper'
RSpec.describe TrendingTags do
describe '.record_use!' do
pending
end
describe '.update!' do
let!(:at_time) { Time.now.utc }
let!(:tag1) { Fabricate(:tag, name: 'Catstodon') }
let!(:tag2) { Fabricate(:tag, name: 'DogsOfMastodon') }
let!(:tag3) { Fabricate(:tag, name: 'OCs') }
before do
allow(Redis.current).to receive(:pfcount) do |key|
case key
when "activity:tags:#{tag1.id}:#{(at_time - 1.day).beginning_of_day.to_i}:accounts"
2
when "activity:tags:#{tag1.id}:#{at_time.beginning_of_day.to_i}:accounts"
16
when "activity:tags:#{tag2.id}:#{(at_time - 1.day).beginning_of_day.to_i}:accounts"
0
when "activity:tags:#{tag2.id}:#{at_time.beginning_of_day.to_i}:accounts"
4
when "activity:tags:#{tag3.id}:#{(at_time - 1.day).beginning_of_day.to_i}:accounts"
13
end
end
Redis.current.zadd('trending_tags', 0.9, tag3.id)
Redis.current.sadd("trending_tags:used:#{at_time.beginning_of_day.to_i}", [tag1.id, tag2.id])
tag3.update(max_score: 0.9, max_score_at: (at_time - 1.day).beginning_of_day + 12.hours)
described_class.update!(at_time)
end
it 'calculates and re-calculates scores' do
expect(described_class.get(10, filtered: false)).to eq [tag1, tag3]
end
it 'omits hashtags below threshold' do
expect(described_class.get(10, filtered: false)).to_not include(tag2)
end
it 'decays scores' do
expect(Redis.current.zscore('trending_tags', tag3.id)).to be < 0.9
end
end
describe '.trending?' do
let(:tag) { Fabricate(:tag) }
before do
10.times { |i| Redis.current.zadd('trending_tags', i + 1, Fabricate(:tag).id) }
end
it 'returns true if the hashtag is within limit' do
Redis.current.zadd('trending_tags', 11, tag.id)
expect(described_class.trending?(tag)).to be true
end
it 'returns false if the hashtag is outside the limit' do
Redis.current.zadd('trending_tags', 0, tag.id)
expect(described_class.trending?(tag)).to be false
end
end
end