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