make post boost transactional

api/resolvers/item.js

@@ -421,13 +421,8 @@ const createItem = async (parent, { title, url, text, boost, parentId }, { me, m
   }
 
   const [item] = await serialize(models,
-    models.$queryRaw(`${SELECT} FROM create_item($1, $2, $3, $4, $5) AS "Item"`,
-      title, url, text, Number(parentId), Number(me.id)))
-
-  if (boost) {
-    await serialize(models,
-      models.$queryRaw`SELECT item_act(${item.id}, ${me.id}, 'BOOST', ${Number(boost)})`)
-  }
+    models.$queryRaw(`${SELECT} FROM create_item($1, $2, $3, $4, $5, $6) AS "Item"`,
+      title, url, text, Number(boost || 0), Number(parentId), Number(me.id)))
 
   await createMentions(item, models)
 

prisma/migrations/20210914173926_item_boost/migration.sql

@@ -0,0 +1,49 @@
+-- make sure we nuke the old versions
+DROP FUNCTION create_item(text,text,text,integer,integer);
+
+CREATE OR REPLACE FUNCTION create_item(title TEXT, url TEXT, text TEXT, boost INTEGER, parent_id INTEGER, user_id INTEGER)
+RETURNS "Item"
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    user_sats INTEGER;
+    free_posts INTEGER;
+    free_comments INTEGER;
+    freebie BOOLEAN;
+    item "Item";
+BEGIN
+    PERFORM ASSERT_SERIALIZED();
+
+    SELECT (msats / 1000), "freePosts", "freeComments"
+    INTO user_sats, free_posts, free_comments
+    FROM users WHERE id = user_id;
+
+    freebie := (parent_id IS NULL AND free_posts > 0) OR (parent_id IS NOT NULL AND free_comments > 0);
+
+    IF NOT freebie AND 1 > user_sats  THEN
+      RAISE EXCEPTION 'SN_INSUFFICIENT_FUNDS';
+    END IF;
+
+    INSERT INTO "Item" (title, url, text, "userId", "parentId", created_at, updated_at)
+    VALUES (title, url, text, user_id, parent_id, now_utc(), now_utc()) RETURNING * INTO item;
+
+    IF freebie THEN
+        IF parent_id IS NULL THEN
+            UPDATE users SET "freePosts" = "freePosts" - 1 WHERE id = user_id;
+        ELSE
+            UPDATE users SET "freeComments" = "freeComments" - 1 WHERE id = user_id;
+        END IF;
+    ELSE
+        UPDATE users SET msats = msats - 1000 WHERE id = user_id;
+
+        INSERT INTO "ItemAct" (sats, "itemId", "userId", act, created_at, updated_at)
+        VALUES (1, item.id, user_id, 'VOTE', now_utc(), now_utc());
+    END IF;
+
+    IF boost > 0 THEN
+        PERFORM item_act(item.id, user_id, 'BOOST', boost);
+    END IF;
+
+    RETURN item;
+END;
+$$;