You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
258 lines
9.9 KiB
258 lines
9.9 KiB
# frozen_string_literal: true
|
|
|
|
require 'singleton'
|
|
|
|
class FeedManager
|
|
include Singleton
|
|
|
|
MAX_ITEMS = 400
|
|
|
|
# Must be <= MAX_ITEMS or the tracking sets will grow forever
|
|
REBLOG_FALLOFF = 40
|
|
|
|
def key(type, id, subtype = nil)
|
|
return "feed:#{type}:#{id}" unless subtype
|
|
|
|
"feed:#{type}:#{id}:#{subtype}"
|
|
end
|
|
|
|
def filter?(timeline_type, status, receiver_id)
|
|
if timeline_type == :home
|
|
filter_from_home?(status, receiver_id)
|
|
elsif timeline_type == :mentions
|
|
filter_from_mentions?(status, receiver_id)
|
|
else
|
|
false
|
|
end
|
|
end
|
|
|
|
def push(timeline_type, account, status)
|
|
return false unless add_to_feed(timeline_type, account, status)
|
|
|
|
trim(timeline_type, account.id)
|
|
|
|
PushUpdateWorker.perform_async(account.id, status.id) if push_update_required?(timeline_type, account.id)
|
|
|
|
true
|
|
end
|
|
|
|
def unpush(timeline_type, account, status)
|
|
return false unless remove_from_feed(timeline_type, account, status)
|
|
|
|
payload = Oj.dump(event: :delete, payload: status.id.to_s)
|
|
Redis.current.publish("timeline:#{account.id}", payload)
|
|
|
|
true
|
|
end
|
|
|
|
def trim(type, account_id)
|
|
timeline_key = key(type, account_id)
|
|
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)
|
|
|
|
# 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 - 1
|
|
falloff_range = redis.zrevrange(timeline_key, falloff_rank, falloff_rank, with_scores: true)
|
|
falloff_score = falloff_range&.first&.last&.to_i || 0
|
|
|
|
# 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, account_id, "reblogs:#{reblogged_id}"))
|
|
end
|
|
end
|
|
|
|
def push_update_required?(timeline_type, account_id)
|
|
timeline_type != :home || redis.get("subscribed:timeline:#{account_id}").present?
|
|
end
|
|
|
|
def merge_into_timeline(from_account, into_account)
|
|
timeline_key = key(:home, into_account.id)
|
|
query = from_account.statuses.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
|
|
query = query.where('id > ?', oldest_home_score)
|
|
end
|
|
|
|
query.each do |status|
|
|
next if status.direct_visibility? || filter?(:home, status, into_account)
|
|
add_to_feed(:home, into_account, status)
|
|
end
|
|
|
|
trim(:home, into_account.id)
|
|
end
|
|
|
|
def unmerge_from_timeline(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, status)
|
|
end
|
|
end
|
|
|
|
def clear_from_timeline(account, target_account)
|
|
timeline_key = key(:home, account.id)
|
|
timeline_status_ids = redis.zrange(timeline_key, 0, -1)
|
|
target_statuses = Status.where(id: timeline_status_ids, account: target_account)
|
|
|
|
target_statuses.each do |status|
|
|
unpush(:home, account, status)
|
|
end
|
|
end
|
|
|
|
def populate_feed(account)
|
|
added = 0
|
|
limit = FeedManager::MAX_ITEMS / 2
|
|
max_id = nil
|
|
|
|
loop do
|
|
statuses = Status.as_home_timeline(account)
|
|
.paginate_by_max_id(limit, max_id)
|
|
|
|
break if statuses.empty?
|
|
|
|
statuses.each do |status|
|
|
next if filter_from_home?(status, account)
|
|
added += 1 if add_to_feed(:home, account, status)
|
|
end
|
|
|
|
break unless added.zero?
|
|
|
|
max_id = statuses.last.id
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
def redis
|
|
Redis.current
|
|
end
|
|
|
|
def filter_from_home?(status, receiver_id)
|
|
keyword_mute_matcher = Glitch::KeywordMute.matcher_for(receiver_id)
|
|
|
|
return true if keyword_mute_matcher =~ status.text
|
|
|
|
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?)
|
|
|
|
check_for_mutes = [status.account_id]
|
|
check_for_mutes.concat(status.mentions.pluck(:account_id))
|
|
check_for_mutes.concat([status.reblog.account_id]) if status.reblog?
|
|
|
|
return true if Mute.where(account_id: receiver_id, target_account_id: check_for_mutes).any?
|
|
|
|
check_for_blocks = status.mentions.pluck(:account_id)
|
|
check_for_blocks.concat([status.reblog.account_id]) if status.reblog?
|
|
|
|
return true if Block.where(account_id: receiver_id, target_account_id: check_for_blocks).any?
|
|
|
|
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 &&= 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 = 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 ||= keyword_mute_matcher.matches?(status.reblog.text)
|
|
should_filter ||= AccountDomainBlock.where(account_id: receiver_id, domain: status.reblog.account.domain).exists? # or the author's domain is blocked
|
|
return should_filter
|
|
end
|
|
|
|
false
|
|
end
|
|
|
|
def filter_from_mentions?(status, receiver_id)
|
|
return true if receiver_id == status.account_id
|
|
|
|
check_for_blocks = [status.account_id]
|
|
check_for_blocks.concat(status.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 = Block.where(account_id: receiver_id, target_account_id: check_for_blocks).any? # Filter if it's from someone I blocked, in reply to someone I blocked, or mentioning someone I blocked
|
|
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
|
|
|
|
# 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.
|
|
def add_to_feed(timeline_type, account, status)
|
|
timeline_key = key(timeline_type, account.id)
|
|
reblog_key = key(timeline_type, account.id, 'reblogs')
|
|
|
|
if status.reblog?
|
|
# 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
|
|
|
|
reblog_rank = redis.zrevrank(reblog_key, status.reblog_of_id)
|
|
if reblog_rank.nil?
|
|
# 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)
|
|
redis.zadd(reblog_key, status.id, status.reblog_of_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
|
|
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.
|
|
def remove_from_feed(timeline_type, account, status)
|
|
timeline_key = key(timeline_type, account.id)
|
|
|
|
if status.reblog?
|
|
# 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)
|
|
# 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).sort.first
|
|
|
|
redis.zadd(timeline_key, other_reblog, other_reblog) 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}"))
|
|
end
|
|
|
|
redis.zrem(timeline_key, status.id)
|
|
end
|
|
end
|
|
|