36 lines
1.3 KiB
MySQL
36 lines
1.3 KiB
MySQL
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-- take a bid and return whether they have enough funds to support it
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CREATE OR REPLACE FUNCTION run_auction(item_id INTEGER, bid INTEGER) RETURNS BOOLEAN AS $$
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DECLARE
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bpm_msats INTEGER;
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user_id INTEGER;
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user_msats INTEGER;
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item_status "Status";
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BEGIN
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PERFORM ASSERT_SERIALIZED();
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bpm_msats := (bid * 5) / 216;
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-- extract data we need
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SELECT "userId", status INTO user_id, item_status FROM "Item" WHERE id = item_id;
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SELECT msats INTO user_msats FROM users WHERE id = user_id;
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-- check if user wallet has enough sats
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IF bpm_msats > user_msats THEN
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-- if not, set status = NOSATS and statusUpdatedAt to now_utc if not already set
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IF item_status <> 'NOSATS' THEN
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UPDATE "Item" SET status = 'NOSATS', "statusUpdatedAt" = now_utc() WHERE id = item_id;
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END IF;
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RETURN false;
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ELSE
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-- if so, deduct from user
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UPDATE users SET msats = msats - bpm_msats WHERE id = user_id;
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-- update item status = ACTIVE and statusUpdatedAt = null if NOSATS
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IF item_status = 'NOSATS' THEN
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UPDATE "Item" SET status = 'ACTIVE', "statusUpdatedAt" = now_utc() WHERE id = item_id;
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END IF;
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RETURN true;
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END IF;
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END;
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$$ LANGUAGE plpgsql;
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