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class FanOutOnWriteService < BaseService
MAX_FEED_SIZE = 800
# Push a status into home and mentions feeds
# @param [Status] status
def call(status)
replied_to_user = status.reply? ? status.thread.account : nil
# Deliver to local self
push(:home, status.account.id, status) if status.account.local?
# Deliver to local followers
status.account.followers.each do |follower|
next if (status.reply? && !follower.following?(replied_to_user)) || !follower.local?
push(:home, follower.id, status)
end
# Deliver to local mentioned
status.mentions.each do |mentioned_account|
next unless mentioned_account.local?
push(:mentions, mentioned_account.id, status)
end
end
private
def push(type, receiver_id, status)
redis.zadd(key(type, receiver_id), status.created_at.to_i, status.id)
trim(type, receiver_id)
end
def trim(type, receiver_id)
return unless redis.zcard(key(type, receiver_id)) > MAX_FEED_SIZE
last = redis.zrevrange(key(type, receiver_id), MAX_FEED_SIZE - 1, MAX_FEED_SIZE - 1)
redis.zremrangebyscore(key(type, receiver_id), '-inf', "(#{last.last}")
end
def key(type, id)
"feed:#{type}:#{id}"
end
def redis
$redis
end
end
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