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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)
else
filter_from_mentions?(status, receiver)
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, status))
end
def broadcast(account_id, options = {})
ActionCable.server.broadcast("timeline:#{account_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
private
def redis
$redis
end
# Filter status out of the home feed if it is a reply to someone the user doesn't follow
def filter_from_home?(status, receiver)
replied_to_user = status.reply? ? status.thread.account : nil
(status.reply? && !(receiver.id == replied_to_user.id || replied_to_user.id == status.account_id || receiver.following?(replied_to_user)))
end
def filter_from_mentions?(status, receiver)
receiver.blocking?(status.account) || (status.reblog? && receiver.blocking?(status.reblog.account))
end
def inline_render(target_account, status)
rabl_scope = Class.new do
include RoutingHelper
def initialize(account)
@account = account
end
def current_user
@account.user
end
def current_account
@account
end
end
Rabl::Renderer.new('api/v1/statuses/show', status, view_path: 'app/views', format: :json, scope: rabl_scope.new(target_account)).render
end
end
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