47 lines
1.8 KiB
MySQL
47 lines
1.8 KiB
MySQL
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CREATE OR REPLACE FUNCTION item_act(item_id INTEGER, user_id INTEGER, act "ItemActType", act_sats INTEGER)
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RETURNS INTEGER
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LANGUAGE plpgsql
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AS $$
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DECLARE
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user_sats INTEGER;
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BEGIN
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PERFORM ASSERT_SERIALIZED();
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SELECT (msats / 1000) INTO user_sats FROM users WHERE id = user_id;
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IF act_sats > user_sats THEN
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RAISE EXCEPTION 'SN_INSUFFICIENT_FUNDS';
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END IF;
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UPDATE users SET msats = msats - (act_sats * 1000) WHERE id = user_id;
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CASE act
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when 'VOTE', 'BOOST' then
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-- if we've already voted, then this is boost (doing this here prevents any potential
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-- race)
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IF EXISTS (SELECT 1 FROM "ItemAct" WHERE "itemId" = item_id AND "userId" = user_id) OR act = 'BOOST' THEN
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INSERT INTO "ItemAct" (sats, "itemId", "userId", act, created_at, updated_at)
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VALUES (act_sats, item_id, user_id, 'BOOST', now_utc(), now_utc());
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-- this is a vote
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ELSE
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-- only 1 sat votes are allowed
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IF act_sats > 1 THEN
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RAISE EXCEPTION 'SN_EXCEEDS_ACT_SAT_LIMIT';
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END IF;
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INSERT INTO "ItemAct" (sats, "itemId", "userId", act, created_at, updated_at)
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VALUES (1, item_id, user_id, 'VOTE', now_utc(), now_utc());
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-- give the item's user 1 sat
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UPDATE users SET msats = msats + 1000 WHERE id = (SELECT "userId" FROM "Item" WHERE id = item_id);
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END IF;
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when 'TIP' then
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INSERT INTO "ItemAct" (sats, "itemId", "userId", act, created_at, updated_at)
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VALUES (act_sats, item_id, user_id, 'TIP', now_utc(), now_utc());
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-- give the item's user act_sats
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UPDATE users SET msats = msats + (act_sats * 1000) WHERE id = (SELECT "userId" FROM "Item" WHERE id = item_id);
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END case;
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RETURN act_sats;
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END;
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$$;
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