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# frozen_string_literal: true
require 'singleton'
class FeedManager
include Singleton
MAX_ITEMS = 800
def key(type, id)
"feed:#{type}:#{id}"
end
def filter?(timeline_type, status, receiver)
if timeline_type == :home
filter_from_home?(status, receiver)
elsif timeline_type == :mentions
filter_from_mentions?(status, receiver)
elsif timeline_type == :public
filter_from_public?(status, receiver)
else
false
end
end
def push(timeline_type, account, status)
redis.zadd(key(timeline_type, account.id), status.id, status.reblog? ? status.reblog_of_id : status.id)
trim(timeline_type, account.id)
broadcast(account.id, type: 'update', timeline: timeline_type, message: inline_render(account, 'api/v1/statuses/show', status))
end
def broadcast(timeline_id, options = {})
ActionCable.server.broadcast("timeline:#{timeline_id}", options)
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 merge_into_timeline(from_account, into_account)
timeline_key = key(:home, into_account.id)
from_account.statuses.limit(MAX_ITEMS).each do |status|
next if filter?(:home, status, into_account)
redis.zadd(timeline_key, status.id, status.id)
end
trim(:home, into_account.id)
end
def unmerge_from_timeline(from_account, into_account)
timeline_key = key(:home, into_account.id)
from_account.statuses.select('id').find_each do |status|
redis.zrem(timeline_key, status.id)
redis.zremrangebyscore(timeline_key, status.id, status.id)
end
end
def inline_render(target_account, template, object)
rabl_scope = Class.new do
include RoutingHelper
def initialize(account)
@account = account
end
def current_user
@account.try(:user)
end
def current_account
@account
end
end
Rabl::Renderer.new(template, object, view_path: 'app/views', format: :json, scope: rabl_scope.new(target_account)).render
end
private
def redis
Redis.current
end
def filter_from_home?(status, receiver)
should_filter = false
if status.reply? && !status.in_reply_to_account_id.nil? # Filter out if it's a reply
should_filter = !receiver.following?(status.in_reply_to_account) # 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
elsif status.reblog? # Filter out a reblog
should_filter = receiver.blocking?(status.reblog.account) # if I'm blocking the reblogged person
end
should_filter ||= receiver.blocking?(status.mentions.map(&:account_id)) # or if it mentions someone I blocked
should_filter
end
def filter_from_mentions?(status, receiver)
should_filter = receiver.id == status.account_id # Filter if I'm mentioning myself
should_filter ||= receiver.blocking?(status.account) # or it's from someone I blocked
should_filter ||= receiver.blocking?(status.mentions.includes(:account).map(&:account)) # or if it mentions someone I blocked
should_filter ||= (status.account.silenced? && !receiver.following?(status.account)) # of if the account is silenced and I'm not following them
should_filter ||= (status.private_visibility? && !receiver.following?(status.account)) # or if the mentioned account is not permitted to see the private status
if status.reply? && !status.in_reply_to_account_id.nil? # or it's a reply
should_filter ||= receiver.blocking?(status.in_reply_to_account) # to a user I blocked
end
should_filter
end
def filter_from_public?(status, receiver)
should_filter = receiver.blocking?(status.account)
should_filter ||= receiver.blocking?(status.mentions.includes(:account).map(&:account))
if status.reply? && !status.in_reply_to_account_id.nil?
should_filter ||= receiver.blocking?(status.in_reply_to_account)
elsif status.reblog?
should_filter ||= receiver.blocking?(status.reblog.account)
end
should_filter
end
end
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