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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 |