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# frozen_string_literal: true
require 'singleton'
class FeedManager
include Singleton
MAX_ITEMS = 400
def key(type, id)
"feed:#{type}:#{id}"
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)
timeline_key = key(timeline_type, account.id)
if status.reblog?
# If the original status is within 40 statuses from top, do not re-insert it into the feed
rank = redis.zrevrank(timeline_key, status.reblog_of_id)
return if !rank.nil? && rank < 40
redis.zadd(timeline_key, status.id, status.reblog_of_id)
else
redis.zadd(timeline_key, status.id, status.id)
trim(timeline_type, account.id)
end
PushUpdateWorker.perform_async(account.id, status.id) if push_update_required?(timeline_type, account.id)
end
def trim(type, account_id)
return unless redis.zcard(key(type, account_id)) > FeedManager::MAX_ITEMS
last = redis.zrevrange(key(type, account_id), FeedManager::MAX_ITEMS - 1, FeedManager::MAX_ITEMS - 1)
redis.zremrangebyscore(key(type, account_id), '-inf', "(#{last.last}")
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
redis.pipelined do
query.each do |status|
next if status.direct_visibility? || filter?(:home, status, into_account)
redis.zadd(timeline_key, status.id, status.id)
end
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').where('id > ?', oldest_home_score).reorder(nil).find_in_batches do |statuses|
redis.pipelined do
statuses.each do |status|
redis.zrem(timeline_key, status.id)
redis.zremrangebyscore(timeline_key, status.id, status.id)
end
end
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_status_ids = Status.where(id: timeline_status_ids, account: target_account).ids
redis.zrem(timeline_key, target_status_ids) if target_status_ids.present?
end
private
def redis
Redis.current
end
def filter_from_home?(status, receiver_id)
# extremely violent filtering code BEGIN
#filter_string = 'e'
#reggie = Regexp.new(filter_string)
#return true if reggie === status.content || reggie === status.spoiler_text
# extremely violent filtering code END
return true if status.reply? && status.in_reply_to_id.nil?
check_for_mutes = [status.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 ||= 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)
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 = receiver_id == status.account_id # Filter if I'm mentioning myself
should_filter ||= Block.where(account_id: receiver_id, target_account_id: check_for_blocks).any? # or 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
end
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