stacker.news/worker/earn.js

95 lines
3.5 KiB
JavaScript

const serialize = require('../api/resolvers/serial')
const ITEM_EACH_REWARD = 3.0
const UPVOTE_EACH_REWARD = 6.0
const TOP_ITEMS = 21
const EARLY_MULTIPLIER_MAX = 100.0
// TODO: use a weekly trust measure or make trust decay
function earn ({ models }) {
return async function ({ name }) {
console.log('running', name)
// compute how much sn earned today
const [{ sum }] = await models.$queryRaw`
SELECT sum("ItemAct".sats)
FROM "ItemAct"
JOIN "Item" on "ItemAct"."itemId" = "Item".id
WHERE ("ItemAct".act in ('BOOST', 'STREAM')
OR ("ItemAct".act IN ('VOTE','POLL') AND "Item"."userId" = "ItemAct"."userId"))
AND "ItemAct".created_at > now_utc() - INTERVAL '1 day'`
/*
How earnings work:
1/3: top 21 posts over last 36 hours, scored on a relative basis
1/3: top 21 comments over last 36 hours, scored on a relative basis
1/3: top upvoters of top posts/comments, scored on:
- their trust
- how much they tipped
- how early they upvoted it
- how the post/comment scored
*/
// get earners { id, earnings }
const earners = await models.$queryRaw(`
WITH item_ratios AS (
SELECT *,
"weightedVotes"/coalesce(NULLIF(sum("weightedVotes") OVER (PARTITION BY "parentId" IS NULL),0), ${TOP_ITEMS}) AS ratio
FROM (
SELECT *,
ROW_NUMBER() OVER (PARTITION BY "parentId" IS NULL ORDER BY "weightedVotes" desc) AS r
FROM
"Item"
WHERE created_at >= now_utc() - interval '36 hours'
) x
WHERE x.r <= ${TOP_ITEMS}
),
upvoters AS (
SELECT "ItemAct"."userId", item_ratios.id, item_ratios.ratio, item_ratios."parentId",
sum("ItemAct".sats) as tipped, min("ItemAct".created_at) as acted_at
FROM item_ratios
JOIN "ItemAct" on "ItemAct"."itemId" = item_ratios.id
WHERE act IN ('VOTE','TIP')
AND "ItemAct"."userId" <> item_ratios."userId"
GROUP BY "ItemAct"."userId", item_ratios.id, item_ratios.ratio, item_ratios."parentId"
),
upvoter_ratios AS (
SELECT "userId", sum(early_multiplier*tipped_ratio*ratio*users.trust) as upvoting_score,
"parentId" IS NULL as "isPost"
FROM (
SELECT *,
${EARLY_MULTIPLIER_MAX}/(ROW_NUMBER() OVER (partition by id order by acted_at asc)) AS early_multiplier,
tipped::float/(sum(tipped) OVER (partition by id)) tipped_ratio
FROM upvoters
) u
JOIN users on "userId" = users.id
GROUP BY "userId", "parentId" IS NULL
)
SELECT "userId" as id, FLOOR(sum(proportion)*${sum}*1000) as earnings
FROM (
SELECT "userId",
upvoting_score/(sum(upvoting_score) OVER (PARTITION BY "isPost"))/${UPVOTE_EACH_REWARD} as proportion
FROM upvoter_ratios
UNION ALL
SELECT "userId", ratio/${ITEM_EACH_REWARD} as proportion
FROM item_ratios
) a
GROUP BY "userId"
HAVING FLOOR(sum(proportion)*${sum}) >= 1`)
// for each earner, serialize earnings
// we do this for each earner because we don't need to serialize
// all earner updates together
earners.forEach(async earner => {
if (earner.earnings > 0) {
await serialize(models,
models.$executeRaw`SELECT earn(${earner.id}, ${earner.earnings})`)
}
})
console.log('done', name)
}
}
module.exports = { earn }