masto-fe/app/lib/feed_manager.rb
Claire cbd0ee1d07
Update Mastodon to Rails 6.1 (#15910)
* Update devise-two-factor to unreleased fork for Rails 6 support

Update tests to match new `rotp` version.

* Update nsa gem to unreleased fork for Rails 6 support

* Update rails to 6.1.3 and rails-i18n to 6.0

* Update to unreleased fork of pluck_each for Ruby 6 support

* Run "rails app:update"

* Add missing ActiveStorage config file

* Use config.ssl_options instead of removed ApplicationController#force_ssl

Disabled force_ssl-related tests as they do not seem to be easily testable
anymore.

* Fix nonce directives by removing Rails 5 specific monkey-patching

* Fix fixture_file_upload deprecation warning

* Fix yield-based test failing with Rails 6

* Use Rails 6's index_with when possible

* Use ActiveRecord::Cache::Store#delete_multi from Rails 6

This will yield better performances when deleting an account

* Disable Rails 6.1's automatic preload link headers

Since Rails 6.1, ActionView adds preload links for javascript files
in the Links header per default.

In our case, that will bloat headers too much and potentially cause
issues with reverse proxies. Furhermore, we don't need those links,
as we already output them as HTML link tags.

* Switch to Rails 6.0 default config

* Switch to Rails 6.1 default config

* Do not include autoload paths in the load path
2021-03-24 10:44:31 +01:00

545 lines
22 KiB
Ruby

# frozen_string_literal: true
require 'singleton'
class FeedManager
include Singleton
include Redisable
# Maximum number of items stored in a single feed
MAX_ITEMS = 400
# Number of items in the feed since last reblog of status
# before the new reblog will be inserted. Must be <= MAX_ITEMS
# or the tracking sets will grow forever
REBLOG_FALLOFF = 40
# Execute block for every active account
# @yield [Account]
# @return [void]
def with_active_accounts(&block)
Account.joins(:user).where('users.current_sign_in_at > ?', User::ACTIVE_DURATION.ago).find_each(&block)
end
# Redis key of a feed
# @param [Symbol] type
# @param [Integer] id
# @param [Symbol] subtype
# @return [String]
def key(type, id, subtype = nil)
return "feed:#{type}:#{id}" unless subtype
"feed:#{type}:#{id}:#{subtype}"
end
# Check if the status should not be added to a feed
# @param [Symbol] timeline_type
# @param [Status] status
# @param [Account|List] receiver
# @return [Boolean]
def filter?(timeline_type, status, receiver)
case timeline_type
when :home
filter_from_home?(status, receiver.id, build_crutches(receiver.id, [status]))
when :list
filter_from_list?(status, receiver) || filter_from_home?(status, receiver.account_id, build_crutches(receiver.account_id, [status]))
when :mentions
filter_from_mentions?(status, receiver.id)
else
false
end
end
# Add a status to a home feed and send a streaming API update
# @param [Account] account
# @param [Status] status
# @return [Boolean]
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
end
# Remove a status from a home feed and send a streaming API update
# @param [Account] account
# @param [Status] status
# @return [Boolean]
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
# Add a status to a list feed and send a streaming API update
# @param [List] list
# @param [Status] status
# @return [Boolean]
def push_to_list(list, status)
return false if filter_from_list?(status, list) || !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
end
# Remove a status from a list feed and send a streaming API update
# @param [List] list
# @param [Status] status
# @return [Boolean]
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
# Fill a home feed with an account's statuses
# @param [Account] from_account
# @param [Account] into_account
# @return [void]
def merge_into_home(from_account, into_account)
timeline_key = key(:home, into_account.id)
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
query = query.where('id > ?', oldest_home_score)
end
statuses = query.to_a
crutches = build_crutches(into_account.id, statuses)
statuses.each do |status|
next if filter_from_home?(status, into_account.id, crutches)
add_to_feed(:home, into_account.id, status, aggregate)
end
trim(:home, into_account.id)
end
# Fill a list feed with an account's statuses
# @param [Account] from_account
# @param [List] list
# @return [void]
def merge_into_list(from_account, list)
timeline_key = key(:list, list.id)
aggregate = list.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
query = query.where('id > ?', oldest_home_score)
end
statuses = query.to_a
crutches = build_crutches(list.account_id, statuses)
statuses.each do |status|
next if filter_from_home?(status, list.account_id, crutches) || filter_from_list?(status, list)
add_to_feed(:list, list.id, status, aggregate)
end
trim(:list, list.id)
end
# Remove an account's statuses from a home feed
# @param [Account] from_account
# @param [Account] into_account
# @return [void]
def unmerge_from_home(from_account, into_account)
timeline_key = key(:home, into_account.id)
oldest_home_score = redis.zrange(timeline_key, 0, 0, with_scores: true)&.first&.last&.to_i || 0
from_account.statuses.select('id, reblog_of_id').where('id > ?', oldest_home_score).reorder(nil).find_each do |status|
remove_from_feed(:home, into_account.id, status, into_account.user&.aggregates_reblogs?)
end
end
# Remove an account's statuses from a list feed
# @param [Account] from_account
# @param [List] list
# @return [void]
def unmerge_from_list(from_account, list)
timeline_key = key(:list, list.id)
oldest_list_score = redis.zrange(timeline_key, 0, 0, with_scores: true)&.first&.last&.to_i || 0
from_account.statuses.select('id, reblog_of_id').where('id > ?', oldest_list_score).reorder(nil).find_each do |status|
remove_from_feed(:list, list.id, status, list.account.user&.aggregates_reblogs?)
end
end
# Clear all statuses from or mentioning target_account from a home feed
# @param [Account] account
# @param [Account] target_account
# @return [void]
def clear_from_home(account, target_account)
timeline_key = key(:home, account.id)
timeline_status_ids = redis.zrange(timeline_key, 0, -1)
statuses = Status.where(id: timeline_status_ids).select(:id, :reblog_of_id, :account_id).to_a
reblogged_ids = Status.where(id: statuses.map(&:reblog_of_id).compact, account: target_account).pluck(:id)
with_mentions_ids = Mention.active.where(status_id: statuses.flat_map { |s| [s.id, s.reblog_of_id] }.compact, account: target_account).pluck(:status_id)
target_statuses = statuses.select do |status|
status.account_id == target_account.id || reblogged_ids.include?(status.reblog_of_id) || with_mentions_ids.include?(status.id) || with_mentions_ids.include?(status.reblog_of_id)
end
target_statuses.each do |status|
unpush_from_home(account, status)
end
end
# Populate home feed of account from scratch
# @param [Account] account
# @return [void]
def populate_home(account)
limit = FeedManager::MAX_ITEMS / 2
aggregate = account.user&.aggregates_reblogs?
timeline_key = key(:home, account.id)
account.statuses.limit(limit).each do |status|
add_to_feed(:home, account.id, status, aggregate)
end
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)
# 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
statuses = target_account.statuses.where(visibility: [:public, :unlisted, :private]).includes(:preloadable_poll, reblog: :account).limit(limit)
crutches = build_crutches(account.id, statuses)
statuses.each do |status|
next if filter_from_home?(status, account.id, crutches)
add_to_feed(:home, account.id, status, aggregate)
end
trim(:home, account.id)
end
end
# Completely clear multiple feeds at once
# @param [Symbol] type
# @param [Array<Integer>] ids
# @return [void]
def clean_feeds!(type, ids)
reblogged_id_sets = {}
redis.pipelined do
ids.each do |feed_id|
redis.del(key(type, feed_id))
reblog_key = key(type, feed_id, 'reblogs')
# We collect a future for this: we don't block while getting
# it, but we can iterate over it later.
reblogged_id_sets[feed_id] = redis.zrange(reblog_key, 0, -1)
redis.del(reblog_key)
end
end
# Remove all of the reblog tracking keys we just removed the
# references to.
redis.pipelined do
reblogged_id_sets.each do |feed_id, future|
future.value.each do |reblogged_id|
reblog_set_key = key(type, feed_id, "reblogs:#{reblogged_id}")
redis.del(reblog_set_key)
end
end
end
end
private
# Trim a feed to maximum size by removing older items
# @param [Symbol] type
# @param [Integer] timeline_id
# @return [void]
def trim(type, timeline_id)
timeline_key = key(type, timeline_id)
reblog_key = key(type, timeline_id, 'reblogs')
# Remove any items past the MAX_ITEMS'th entry in our feed
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.
falloff_rank = FeedManager::REBLOG_FALLOFF
falloff_range = redis.zrevrange(timeline_key, falloff_rank, falloff_rank, with_scores: true)
falloff_score = falloff_range&.first&.last&.to_i
return if falloff_score.nil?
# Get any reblogs we might have to clean up after.
redis.zrangebyscore(reblog_key, 0, falloff_score).each do |reblogged_id|
# Remove it from the set of reblogs we're tracking *first* to avoid races.
redis.zrem(reblog_key, reblogged_id)
# Just drop any set we might have created to track additional reblogs.
# This means that if this reblog is deleted, we won't automatically insert
# another reblog, but also that any new reblog can be inserted into the
# feed.
redis.del(key(type, timeline_id, "reblogs:#{reblogged_id}"))
end
end
# Check if there is a streaming API client connected
# for the given feed
# @param [String] timeline_key
# @return [Boolean]
def push_update_required?(timeline_key)
redis.exists?("subscribed:#{timeline_key}")
end
# Check if the account is blocking or muting any of the given accounts
# @param [Integer] receiver_id
# @param [Array<Integer>] account_ids
# @param [Symbol] context
def blocks_or_mutes?(receiver_id, account_ids, context)
Block.where(account_id: receiver_id, target_account_id: account_ids).any? ||
(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
# Check if status should not be added to the home feed
# @param [Status] status
# @param [Integer] receiver_id
# @param [Hash] crutches
# @return [Boolean]
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 = 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(crutches[:active_mentions][status.reblog_of_id] || [])
end
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 = !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
elsif status.reblog? # Filter out a reblog
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
end
# Check if status should not be added to the mentions feed
# @see NotifyService
# @param [Status] status
# @param [Integer] receiver_id
# @return [Boolean]
def filter_from_mentions?(status, receiver_id)
return true if receiver_id == status.account_id
return true if phrase_filtered?(status, receiver_id, :notifications)
# This filter is called from NotifyService, but already after the sender of
# the notification has been checked for mute/block. Therefore, it's not
# necessary to check the author of the toot for mute/block again
check_for_blocks = status.active_mentions.pluck(:account_id)
check_for_blocks.concat([status.in_reply_to_account]) if status.reply? && !status.in_reply_to_account_id.nil?
should_filter = blocks_or_mutes?(receiver_id, check_for_blocks, :mentions) # Filter if it's from someone I blocked, in reply to someone I blocked, or mentioning someone I blocked (or muted)
should_filter ||= (status.account.silenced? && !Follow.where(account_id: receiver_id, target_account_id: status.account_id).exists?) # of if the account is silenced and I'm not following them
should_filter
end
# Check if status should not be added to the list feed
# @param [Status] status
# @param [List] list
# @return [Boolean]
def filter_from_list?(status, list)
if status.reply? && status.in_reply_to_account_id != status.account_id
should_filter = status.in_reply_to_account_id != list.account_id
should_filter &&= !list.show_followed?
should_filter &&= !(list.show_list? && ListAccount.where(list_id: list.id, account_id: status.in_reply_to_account_id).exists?)
return !!should_filter
end
false
end
# Check if the status hits a phrase filter
# @param [Status] status
# @param [Integer] receiver_id
# @param [Symbol] context
# @return [Boolean]
def phrase_filtered?(status, receiver_id, context)
active_filters = Rails.cache.fetch("filters:#{receiver_id}") { CustomFilter.where(account_id: receiver_id).active_irreversible.to_a }.to_a
active_filters.select! { |filter| filter.context.include?(context.to_s) && !filter.expired? }
active_filters.map! do |filter|
if filter.whole_word
sb = /\A[[:word:]]/.match?(filter.phrase) ? '\b' : ''
eb = /[[:word:]]\z/.match?(filter.phrase) ? '\b' : ''
/(?mix:#{sb}#{Regexp.escape(filter.phrase)}#{eb})/
else
/#{Regexp.escape(filter.phrase)}/i
end
end
return false if active_filters.empty?
combined_regex = active_filters.reduce { |memo, obj| Regexp.union(memo, obj) }
status = status.reblog if status.reblog?
combined_text = [
Formatter.instance.plaintext(status),
status.spoiler_text,
status.preloadable_poll ? status.preloadable_poll.options.join("\n\n") : nil,
status.media_attachments.map(&:description).join("\n\n"),
].compact.join("\n\n")
combined_regex.match?(combined_text)
end
# Adds a status to an account's feed, returning true if a status was
# added, and false if it was not added to the feed. Note that this is
# an internal helper: callers must call trim or push updates if
# either action is appropriate.
# @param [Symbol] timeline_type
# @param [Integer] account_id
# @param [Status] status
# @param [Boolean] aggregate_reblogs
# @return [Boolean]
def add_to_feed(timeline_type, account_id, status, aggregate_reblogs = true)
timeline_key = key(timeline_type, account_id)
reblog_key = key(timeline_type, account_id, 'reblogs')
if status.reblog? && (aggregate_reblogs.nil? || aggregate_reblogs)
# If the original status or a reblog of it is within
# REBLOG_FALLOFF statuses from the top, do not re-insert it into
# the feed
rank = redis.zrevrank(timeline_key, status.reblog_of_id)
return false if !rank.nil? && rank < FeedManager::REBLOG_FALLOFF
# The ordered set at `reblog_key` holds statuses which have a reblog
# in the top `REBLOG_FALLOFF` statuses of the timeline
if redis.zadd(reblog_key, status.id, status.reblog_of_id, nx: true)
# This is not something we've already seen reblogged, so we
# can just add it to the feed (and note that we're reblogging it).
redis.zadd(timeline_key, status.id, status.id)
else
# Another reblog of the same status was already in the
# REBLOG_FALLOFF most recent statuses, so we note that this
# is an "extra" reblog, by storing it in reblog_set_key.
reblog_set_key = key(timeline_type, account_id, "reblogs:#{status.reblog_of_id}")
redis.sadd(reblog_set_key, status.id)
return false
end
else
# A reblog may reach earlier than the original status because of the
# delay of the worker deliverying the original status, the late addition
# by merging timelines, and other reasons.
# If such a reblog already exists, just do not re-insert it into the feed.
return false unless redis.zscore(reblog_key, status.id).nil?
redis.zadd(timeline_key, status.id, status.id)
end
true
end
# Removes an individual status from a feed, correctly handling cases
# with reblogs, and returning true if a status was removed. As with
# `add_to_feed`, this does not trigger push updates, so callers must
# do so if appropriate.
# @param [Symbol] timeline_type
# @param [Integer] account_id
# @param [Status] status
# @param [Boolean] aggregate_reblogs
# @return [Boolean]
def remove_from_feed(timeline_type, account_id, status, aggregate_reblogs = true)
timeline_key = key(timeline_type, account_id)
reblog_key = key(timeline_type, account_id, 'reblogs')
if status.reblog? && (aggregate_reblogs.nil? || aggregate_reblogs)
# 1. If the reblogging status is not in the feed, stop.
status_rank = redis.zrevrank(timeline_key, status.id)
return false if status_rank.nil?
# 2. Remove reblog from set of this status's reblogs.
reblog_set_key = key(timeline_type, account_id, "reblogs:#{status.reblog_of_id}")
redis.srem(reblog_set_key, status.id)
redis.zrem(reblog_key, status.reblog_of_id)
# 3. Re-insert another reblog or original into the feed if one
# remains in the set. We could pick a random element, but this
# set should generally be small, and it seems ideal to show the
# oldest potential such reblog.
other_reblog = redis.smembers(reblog_set_key).map(&:to_i).min
redis.zadd(timeline_key, other_reblog, other_reblog) if other_reblog
redis.zadd(reblog_key, other_reblog, status.reblog_of_id) if other_reblog
# 4. Remove the reblogging status from the feed (as normal)
# (outside conditional)
else
# If the original is getting deleted, no use for reblog references
redis.del(key(timeline_type, account_id, "reblogs:#{status.id}"))
redis.zrem(reblog_key, status.id)
end
redis.zrem(timeline_key, status.id)
end
# Pre-fetch various objects and relationships for given statuses that
# are going to be checked by the filtering methods
# @param [Integer] receiver_id
# @param [Array<Status>] statuses
# @return [Hash]
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).index_with(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).index_with(true)
crutches[:blocking] = Block.where(account_id: receiver_id, target_account_id: check_for_blocks).pluck(:target_account_id).index_with(true)
crutches[:muting] = Mute.where(account_id: receiver_id, target_account_id: check_for_blocks).pluck(:target_account_id).index_with(true)
crutches[:domain_blocking] = AccountDomainBlock.where(account_id: receiver_id, domain: statuses.map { |s| s.reblog&.account&.domain }.compact).pluck(:domain).index_with(true)
crutches[:blocked_by] = Block.where(target_account_id: receiver_id, account_id: statuses.map { |s| s.reblog&.account_id }.compact).pluck(:account_id).index_with(true)
crutches
end
end