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Fix performance of home feed regeneration (#12084)

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Fetching statuses from all followed accounts at once takes too long
within Postgres. Fetching them one by one and merging in Ruby
could be a lot less resource-intensive

Because the query for dynamically fetching the home timeline is so
heavy, we can no longer offer it when the home timeline is missing
This commit is contained in:
Eugen Rochko 2019-10-06 22:11:17 +02:00 • committed by GitHub
parent efda126914
commit f665901e3c
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13 changed files with 134 additions and 143 deletions
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106
app/lib/feed_manager.rb
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@ -19,7 +19,7 @@ class FeedManager
def filter?(timeline_type, status, receiver_id)
if timeline_type == :home
filter_from_home?(status, receiver_id)
filter_from_home?(status, receiver_id, build_crutches(receiver_id, [status]))
elsif timeline_type == :mentions
filter_from_mentions?(status, receiver_id)
else
@ -29,6 +29,7 @@ class FeedManager
def push_to_home(account, status)
return false unless add_to_feed(:home, account.id, status, account.user&.aggregates_reblogs?)
trim(:home, account.id)
PushUpdateWorker.perform_async(account.id, status.id, "timeline:#{account.id}") if push_update_required?("timeline:#{account.id}")
true
@ -36,6 +37,7 @@ class FeedManager
def unpush_from_home(account, status)
return false unless remove_from_feed(:home, account.id, status, account.user&.aggregates_reblogs?)
redis.publish("timeline:#{account.id}", Oj.dump(event: :delete, payload: status.id.to_s))
true
end
@ -46,7 +48,9 @@ class FeedManager
should_filter &&= !ListAccount.where(list_id: list.id, account_id: status.in_reply_to_account_id).exists?
return false if should_filter
end
return false unless add_to_feed(:list, list.id, status, list.account.user&.aggregates_reblogs?)
trim(:list, list.id)
PushUpdateWorker.perform_async(list.account_id, status.id, "timeline:list:#{list.id}") if push_update_required?("timeline:list:#{list.id}")
true
@ -54,6 +58,7 @@ class FeedManager
def unpush_from_list(list, status)
return false unless remove_from_feed(:list, list.id, status, list.account.user&.aggregates_reblogs?)
redis.publish("timeline:list:#{list.id}", Oj.dump(event: :delete, payload: status.id.to_s))
true
end
@ -85,16 +90,21 @@ class FeedManager
def merge_into_timeline(from_account, into_account)
timeline_key = key(:home, into_account.id)
query = from_account.statuses.limit(FeedManager::MAX_ITEMS / 4)
aggregate = into_account.user&.aggregates_reblogs?
query = from_account.statuses.where(visibility: [:public, :unlisted, :private]).includes(:preloadable_poll, reblog: :account).limit(FeedManager::MAX_ITEMS / 4)
if redis.zcard(timeline_key) >= FeedManager::MAX_ITEMS / 4
oldest_home_score = redis.zrange(timeline_key, 0, 0, with_scores: true)&.first&.last&.to_i || 0
oldest_home_score = redis.zrange(timeline_key, 0, 0, with_scores: true).first.last.to_i
query = query.where('id > ?', oldest_home_score)
end
query.each do |status|
next if status.direct_visibility? || status.limited_visibility? || filter?(:home, status, into_account)
add_to_feed(:home, into_account.id, status, into_account.user&.aggregates_reblogs?)
statuses = query.to_a
crutches = build_crutches(into_account.id, statuses)
statuses.each do |status|
next if filter_from_home?(status, into_account, crutches)
add_to_feed(:home, into_account.id, status, aggregate)
end
trim(:home, into_account.id)
@ -120,24 +130,35 @@ class FeedManager
end
def populate_feed(account)
added = 0
limit = FeedManager::MAX_ITEMS / 2
max_id = nil
limit = FeedManager::MAX_ITEMS / 2
aggregate = account.user&.aggregates_reblogs?
timeline_key = key(:home, account.id)
loop do
statuses = Status.as_home_timeline(account)
.paginate_by_max_id(limit, max_id)
account.statuses.where.not(visibility: :direct).limit(limit).each do |status|
add_to_feed(:home, account.id, status, aggregate)
end
break if statuses.empty?
account.following.includes(:account_stat).find_each do |target_account|
if redis.zcard(timeline_key) >= limit
oldest_home_score = redis.zrange(timeline_key, 0, 0, with_scores: true).first.last.to_i
last_status_score = Mastodon::Snowflake.id_at(account.last_status_at)
statuses.each do |status|
next if filter_from_home?(status, account)
added += 1 if add_to_feed(:home, account.id, status, account.user&.aggregates_reblogs?)
# If the feed is full and this account has not posted more recently
# than the last item on the feed, then we can skip the whole account
# because none of its statuses would stay on the feed anyway
next if last_status_score < oldest_home_score
end
break unless added.zero?
statuses = target_account.statuses.where(visibility: [:public, :unlisted, :private]).includes(:preloadable_poll, reblog: :account).limit(limit)
crutches = build_crutches(account.id, statuses)
max_id = statuses.last.id
statuses.each do |status|
next if filter_from_home?(status, account, crutches)
add_to_feed(:home, account.id, status, aggregate)
end
trim(:home, account.id)
end
end
@ -152,31 +173,33 @@ class FeedManager
(context == :home ? Mute.where(account_id: receiver_id, target_account_id: account_ids).any? : Mute.where(account_id: receiver_id, target_account_id: account_ids, hide_notifications: true).any?)
end
def filter_from_home?(status, receiver_id)
def filter_from_home?(status, receiver_id, crutches)
return false if receiver_id == status.account_id
return true if status.reply? && (status.in_reply_to_id.nil? || status.in_reply_to_account_id.nil?)
return true if phrase_filtered?(status, receiver_id, :home)
check_for_blocks = status.active_mentions.pluck(:account_id)
check_for_blocks = crutches[:active_mentions][status.id] || []
check_for_blocks.concat([status.account_id])
if status.reblog?
check_for_blocks.concat([status.reblog.account_id])
check_for_blocks.concat(status.reblog.active_mentions.pluck(:account_id))
check_for_blocks.concat(crutches[:active_mentions][status.reblog_of_id] || [])
end
return true if blocks_or_mutes?(receiver_id, check_for_blocks, :home)
return true if check_for_blocks.any? { |target_account_id| crutches[:blocking][target_account_id] || crutches[:muting][target_account_id] }
if status.reply? && !status.in_reply_to_account_id.nil? # Filter out if it's a reply
should_filter = !Follow.where(account_id: receiver_id, target_account_id: status.in_reply_to_account_id).exists? # and I'm not following the person it's a reply to
should_filter = !crutches[:following][status.in_reply_to_account_id] # and I'm not following the person it's a reply to
should_filter &&= receiver_id != status.in_reply_to_account_id # and it's not a reply to me
should_filter &&= status.account_id != status.in_reply_to_account_id # and it's not a self-reply
return should_filter
return !!should_filter
elsif status.reblog? # Filter out a reblog
should_filter = Follow.where(account_id: receiver_id, target_account_id: status.account_id, show_reblogs: false).exists? # if the reblogger's reblogs are suppressed
should_filter ||= Block.where(account_id: status.reblog.account_id, target_account_id: receiver_id).exists? # or if the author of the reblogged status is blocking me
should_filter ||= AccountDomainBlock.where(account_id: receiver_id, domain: status.reblog.account.domain).exists? # or the author's domain is blocked
return should_filter
should_filter = crutches[:hiding_reblogs][status.account_id] # if the reblogger's reblogs are suppressed
should_filter ||= crutches[:blocked_by][status.reblog.account_id] # or if the author of the reblogged status is blocking me
should_filter ||= crutches[:domain_blocking][status.reblog.account.domain] # or the author's domain is blocked
return !!should_filter
end
false
@ -308,4 +331,31 @@ class FeedManager
redis.zrem(timeline_key, status.id)
end
def build_crutches(receiver_id, statuses)
crutches = {}
crutches[:active_mentions] = Mention.active.where(status_id: statuses.flat_map { |s| [s.id, s.reblog_of_id] }.compact).pluck(:status_id, :account_id).each_with_object({}) { |(id, account_id), mapping| (mapping[id] ||= []).push(account_id) }
check_for_blocks = statuses.flat_map do |s|
arr = crutches[:active_mentions][s.id] || []
arr.concat([s.account_id])
if s.reblog?
arr.concat([s.reblog.account_id])
arr.concat(crutches[:active_mentions][s.reblog_of_id] || [])
end
arr
end
crutches[:following] = Follow.where(account_id: receiver_id, target_account_id: statuses.map(&:in_reply_to_account_id).compact).pluck(:target_account_id).each_with_object({}) { |id, mapping| mapping[id] = true }
crutches[:hiding_reblogs] = Follow.where(account_id: receiver_id, target_account_id: statuses.map { |s| s.account_id if s.reblog? }.compact, show_reblogs: false).pluck(:target_account_id).each_with_object({}) { |id, mapping| mapping[id] = true }
crutches[:blocking] = Block.where(account_id: receiver_id, target_account_id: check_for_blocks).pluck(:target_account_id).each_with_object({}) { |id, mapping| mapping[id] = true }
crutches[:muting] = Mute.where(account_id: receiver_id, target_account_id: check_for_blocks).pluck(:target_account_id).each_with_object({}) { |id, mapping| mapping[id] = true }
crutches[:domain_blocking] = AccountDomainBlock.where(account_id: receiver_id, domain: statuses.map { |s| s.reblog&.account&.domain }.compact).pluck(:domain).each_with_object({}) { |domain, mapping| mapping[domain] = true }
crutches[:blocked_by] = Block.where(target_account_id: receiver_id, account_id: statuses.map { |s| s.reblog&.account_id }.compact).pluck(:account_id).each_with_object({}) { |id, mapping| mapping[id] = true }
crutches
end
end