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hack notifications to be faster

This commit is contained in:
keyan 2022-03-22 14:53:48 -05:00
parent 7a78210cb6
commit 7dda1748cb
1 changed files with 23 additions and 9 deletions
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32
api/resolvers/notifications.js
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@ -63,16 +63,24 @@ export default {
// HACK to make notifications faster, we only return a limited sub set of the unioned
// queries ... we only ever need at most LIMIT+current offset in the child queries to
// have enough items to return in the union
// HACK 2.0 ... replies are slow because they could be a reply to multiple ancestors yet
// we should only get one notification for this reply ... the right
// way would be to make sure the reply query returns unique results but this is slow for users with
// many replies (you have to hash every reply) ... this hack avoids doing that by assuming there will be
// at most 25 ancesestors belonging to the same user for a given reply, see: (LIMIT+OFFSET)*25 which is
// undoubtably the case today ... this probably won't hold indefinitely though
// One other less HACKy way to do this is to store in each reply, an set of users it's in response to
const notifications = await models.$queryRaw(`
(SELECT "Item".id::TEXT, "Item".created_at AS "sortTime", NULL as "earnedSats",
SELECT DISTINCT *
FROM
((SELECT "Item".id::TEXT, "Item".created_at AS "sortTime", NULL as "earnedSats",
'Reply' AS type
FROM "Item"
JOIN "Item" p ON "Item".path <@ p.path
WHERE p."userId" = $1
AND "Item"."userId" <> $1 AND "Item".created_at <= $2
GROUP BY "Item".id
ORDER BY "Item".created_at DESC
LIMIT ${LIMIT}+$3)
ORDER BY "sortTime" DESC
LIMIT (${LIMIT}+$3) * 25)
UNION ALL
(SELECT "Item".id::TEXT, MAX("ItemAct".created_at) AS "sortTime",
sum("ItemAct".sats) as "earnedSats", 'Votification' AS type
@ -83,7 +91,7 @@ export default {
AND "ItemAct".act <> 'BOOST'
AND "Item"."userId" = $1
GROUP BY "Item".id
ORDER BY MAX("ItemAct".created_at) DESC
ORDER BY "sortTime" DESC
LIMIT ${LIMIT}+$3)
UNION ALL
(SELECT "Item".id::TEXT, "Mention".created_at AS "sortTime", NULL as "earnedSats",
@ -95,7 +103,7 @@ export default {
AND "Mention".created_at <= $2
AND "Item"."userId" <> $1
AND (p."userId" IS NULL OR p."userId" <> $1)
ORDER BY "Mention".created_at DESC
ORDER BY "sortTime" DESC
LIMIT ${LIMIT}+$3)
UNION ALL
(SELECT "Invite".id, MAX(users.created_at) AS "sortTime", NULL as "earnedSats",
@ -103,7 +111,9 @@ export default {
FROM users JOIN "Invite" on users."inviteId" = "Invite".id
WHERE "Invite"."userId" = $1
AND users.created_at <= $2
GROUP BY "Invite".id)
GROUP BY "Invite".id
ORDER BY "sortTime" DESC
LIMIT ${LIMIT}+$3)
UNION ALL
(SELECT "Item".id::text, "Item"."statusUpdatedAt" AS "sortTime", NULL as "earnedSats",
'JobChanged' AS type
@ -111,14 +121,18 @@ export default {
WHERE "Item"."userId" = $1
AND "maxBid" IS NOT NULL
AND status <> 'STOPPED'
AND "statusUpdatedAt" <= $2)
AND "statusUpdatedAt" <= $2
ORDER BY "sortTime" DESC
LIMIT ${LIMIT}+$3)
UNION ALL
(SELECT "Earn".id::text, "Earn".created_at AS "sortTime", FLOOR(msats / 1000) as "earnedSats",
'Earn' AS type
FROM "Earn"
WHERE "Earn"."userId" = $1 AND
FLOOR(msats / 1000) > 0
AND created_at <= $2)
AND created_at <= $2
ORDER BY "sortTime" DESC
LIMIT ${LIMIT}+$3)) AS n
ORDER BY "sortTime" DESC
OFFSET $3
LIMIT ${LIMIT}`, me.id, decodedCursor.time, decodedCursor.offset)