64 lines
2.3 KiB
MySQL
64 lines
2.3 KiB
MySQL
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CREATE OR REPLACE FUNCTION create_item(
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title TEXT, url TEXT, text TEXT, boost INTEGER,
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parent_id INTEGER, user_id INTEGER, fwd_user_id INTEGER,
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has_img_link BOOLEAN, spam_within INTERVAL)
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RETURNS "Item"
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LANGUAGE plpgsql
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AS $$
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DECLARE
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user_msats INTEGER;
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cost INTEGER;
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free_posts INTEGER;
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free_comments INTEGER;
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freebie BOOLEAN;
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item "Item";
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med_votes INTEGER;
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BEGIN
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PERFORM ASSERT_SERIALIZED();
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SELECT msats, "freePosts", "freeComments"
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INTO user_msats, free_posts, free_comments
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FROM users WHERE id = user_id;
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freebie := (parent_id IS NULL AND free_posts > 0) OR (parent_id IS NOT NULL AND free_comments > 0);
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cost := 1000 * POWER(10, item_spam(parent_id, user_id, spam_within)) * CASE WHEN has_img_link THEN 10 ELSE 1 END;
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IF NOT freebie AND cost > user_msats THEN
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RAISE EXCEPTION 'SN_INSUFFICIENT_FUNDS';
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END IF;
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-- get this user's median item score
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SELECT COALESCE(percentile_cont(0.5) WITHIN GROUP(ORDER BY "weightedVotes" - "weightedDownVotes"), 0) INTO med_votes FROM "Item" WHERE "userId" = user_id;
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-- if their median votes are positive, start at 0
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-- if the median votes are negative, start their post with that many down votes
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-- basically: if their median post is bad, presume this post is too
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IF med_votes >= 0 THEN
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med_votes := 0;
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ELSE
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med_votes := ABS(med_votes);
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END IF;
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INSERT INTO "Item" (title, url, text, "userId", "parentId", "fwdUserId", "paidImgLink", "weightedDownVotes", created_at, updated_at)
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VALUES (title, url, text, user_id, parent_id, fwd_user_id, has_img_link, med_votes, now_utc(), now_utc()) RETURNING * INTO item;
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IF freebie THEN
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IF parent_id IS NULL THEN
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UPDATE users SET "freePosts" = "freePosts" - 1 WHERE id = user_id;
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ELSE
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UPDATE users SET "freeComments" = "freeComments" - 1 WHERE id = user_id;
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END IF;
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ELSE
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UPDATE users SET msats = msats - cost WHERE id = user_id;
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INSERT INTO "ItemAct" (sats, "itemId", "userId", act, created_at, updated_at)
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VALUES (cost / 1000, item.id, user_id, 'VOTE', now_utc(), now_utc());
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END IF;
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IF boost > 0 THEN
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PERFORM item_act(item.id, user_id, 'BOOST', boost);
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END IF;
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RETURN item;
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END;
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$$;
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