59 lines
2.0 KiB
MySQL
59 lines
2.0 KiB
MySQL
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CREATE OR REPLACE FUNCTION create_item(
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sub TEXT, title TEXT, url TEXT, text TEXT, boost INTEGER, bounty INTEGER,
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parent_id INTEGER, user_id INTEGER, fwd_user_id INTEGER,
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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 BIGINT;
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cost_msats BIGINT;
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freebie BOOLEAN;
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item "Item";
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med_votes FLOAT;
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BEGIN
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PERFORM ASSERT_SERIALIZED();
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SELECT msats INTO user_msats FROM users WHERE id = user_id;
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cost_msats := 1000 * POWER(10, item_spam(parent_id, user_id, spam_within));
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-- it's only a freebie if it's a 1 sat cost, they have < 1 sat, boost = 0, and they have freebies left
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freebie := (cost_msats <= 1000) AND (user_msats < 1000) AND (boost = 0);
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IF NOT freebie AND cost_msats > 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"
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("subName", title, url, text, bounty, "userId", "parentId", "fwdUserId",
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freebie, "weightedDownVotes", created_at, updated_at)
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VALUES
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(sub, title, url, text, bounty, user_id, parent_id, fwd_user_id,
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freebie, med_votes, now_utc(), now_utc()) RETURNING * INTO item;
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IF NOT freebie THEN
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UPDATE users SET msats = msats - cost_msats WHERE id = user_id;
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INSERT INTO "ItemAct" (msats, "itemId", "userId", act, created_at, updated_at)
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VALUES (cost_msats, item.id, user_id, 'FEE', 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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