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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.mentioned_accounts.each do |mention|
- mentioned_account = mention.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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