315 lines
9.4 KiB
JavaScript
315 lines
9.4 KiB
JavaScript
import { UserInputError, AuthenticationError } from 'apollo-server-micro'
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import { ensureProtocol } from '../../lib/url'
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import serialize from './serial'
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const LIMIT = 21
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async function comments (models, id) {
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const flat = await models.$queryRaw(`
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WITH RECURSIVE base AS (
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${SELECT}, ARRAY[row_number() OVER (${ORDER_BY_SATS}, "Item".path)] AS sort_path
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FROM "Item"
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${LEFT_JOIN_SATS}
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WHERE "parentId" = $1
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UNION ALL
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${SELECT}, p.sort_path || row_number() OVER (${ORDER_BY_SATS}, "Item".path)
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FROM base p
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JOIN "Item" ON ltree2text(subpath("Item"."path", 0, -1)) = p."path"
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${LEFT_JOIN_SATS})
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SELECT * FROM base ORDER BY sort_path`, Number(id))
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return nestComments(flat, id)[0]
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}
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function decodeCursor (cursor) {
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if (!cursor) {
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return { offset: 0, time: new Date() }
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} else {
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const res = JSON.parse(Buffer.from(cursor, 'base64'))
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res.time = new Date(res.time)
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return res
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}
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}
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function nextCursorEncoded (cursor) {
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cursor.offset += LIMIT
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return Buffer.from(JSON.stringify(cursor)).toString('base64')
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}
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export default {
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Query: {
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moreItems: async (parent, { sort, cursor, userId }, { me, models }) => {
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const decodedCursor = decodeCursor(cursor)
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let items
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switch (sort) {
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case 'user':
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items = await models.$queryRaw(`
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${SELECT}
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FROM "Item"
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WHERE "userId" = $1 AND "parentId" IS NULL AND created_at <= $2
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ORDER BY created_at DESC
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OFFSET $3
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LIMIT ${LIMIT}`, Number(userId), decodedCursor.time, decodedCursor.offset)
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break
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case 'hot':
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items = await models.$queryRaw(`
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${SELECT}
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FROM "Item"
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${timedLeftJoinSats(1)}
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WHERE "parentId" IS NULL AND created_at <= $1
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${timedOrderBySats(1)}
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OFFSET $2
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LIMIT ${LIMIT}`, decodedCursor.time, decodedCursor.offset)
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break
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default:
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items = await models.$queryRaw(`
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${SELECT}
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FROM "Item"
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WHERE "parentId" IS NULL AND created_at <= $1
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ORDER BY created_at DESC
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OFFSET $2
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LIMIT ${LIMIT}`, decodedCursor.time, decodedCursor.offset)
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break
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}
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return {
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cursor: items.length === LIMIT ? nextCursorEncoded(decodedCursor) : null,
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items
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}
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},
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moreFlatComments: async (parent, { cursor, userId }, { me, models }) => {
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const decodedCursor = decodeCursor(cursor)
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let comments
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if (userId) {
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comments = await models.$queryRaw(`
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${SELECT}
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FROM "Item"
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WHERE "userId" = $1 AND "parentId" IS NOT NULL
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AND created_at <= $2
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ORDER BY created_at DESC
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OFFSET $3
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LIMIT ${LIMIT}`, Number(userId), decodedCursor.time, decodedCursor.offset)
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} else {
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if (!me) {
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throw new AuthenticationError('you must be logged in')
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}
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comments = await models.$queryRaw(`
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${SELECT}
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From "Item"
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JOIN "Item" p ON "Item"."parentId" = p.id AND p."userId" = $1
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AND "Item"."userId" <> $1 AND "Item".created_at <= $2
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ORDER BY "Item".created_at DESC
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OFFSET $3
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LIMIT ${LIMIT}`, me.id, decodedCursor.time, decodedCursor.offset)
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}
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return {
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cursor: comments.length === LIMIT ? nextCursorEncoded(decodedCursor) : null,
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comments
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}
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},
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notifications: async (parent, args, { me, models }) => {
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if (!me) {
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throw new AuthenticationError('you must be logged in')
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}
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return await models.$queryRaw(`
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${SELECT}
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From "Item"
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JOIN "Item" p ON "Item"."parentId" = p.id AND p."userId" = $1
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AND "Item"."userId" <> $1
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ORDER BY "Item".created_at DESC`, me.id)
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},
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item: async (parent, { id }, { models }) => {
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const [item] = await models.$queryRaw(`
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${SELECT}
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FROM "Item"
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WHERE id = $1`, Number(id))
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item.comments = comments(models, id)
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return item
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},
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userComments: async (parent, { userId }, { models }) => {
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return await models.$queryRaw(`
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${SELECT}
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FROM "Item"
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WHERE "userId" = $1 AND "parentId" IS NOT NULL
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ORDER BY created_at DESC`, Number(userId))
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}
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},
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Mutation: {
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createLink: async (parent, { title, url }, { me, models }) => {
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if (!title) {
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throw new UserInputError('link must have title', { argumentName: 'title' })
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}
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if (!url) {
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throw new UserInputError('link must have url', { argumentName: 'url' })
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}
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return await createItem(parent, { title, url: ensureProtocol(url) }, { me, models })
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},
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createDiscussion: async (parent, { title, text }, { me, models }) => {
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if (!title) {
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throw new UserInputError('link must have title', { argumentName: 'title' })
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}
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return await createItem(parent, { title, text }, { me, models })
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},
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createComment: async (parent, { text, parentId }, { me, models }) => {
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if (!text) {
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throw new UserInputError('comment must have text', { argumentName: 'text' })
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}
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if (!parentId) {
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throw new UserInputError('comment must have parent', { argumentName: 'text' })
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}
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return await createItem(parent, { text, parentId }, { me, models })
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},
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vote: async (parent, { id, sats = 1 }, { me, models }) => {
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// need to make sure we are logged in
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if (!me) {
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throw new AuthenticationError('you must be logged in')
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}
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if (sats <= 0) {
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throw new UserInputError('sats must be positive', { argumentName: 'sats' })
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}
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await serialize(models, models.$queryRaw`SELECT vote(${Number(id)}, ${me.name}, ${Number(sats)})`)
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return sats
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}
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},
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Item: {
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user: async (item, args, { models }) =>
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await models.user.findUnique({ where: { id: item.userId } }),
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ncomments: async (item, args, { models }) => {
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const [{ count }] = await models.$queryRaw`
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SELECT count(*)
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FROM "Item"
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WHERE path <@ text2ltree(${item.path}) AND id != ${item.id}`
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return count || 0
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},
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sats: async (item, args, { models }) => {
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const { sum: { sats } } = await models.vote.aggregate({
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sum: {
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sats: true
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},
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where: {
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itemId: item.id,
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boost: false
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}
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})
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return sats || 0
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},
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boost: async (item, args, { models }) => {
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const { sum: { sats } } = await models.vote.aggregate({
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sum: {
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sats: true
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},
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where: {
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itemId: item.id,
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boost: true
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}
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})
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return sats || 0
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},
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meSats: async (item, args, { me, models }) => {
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if (!me) return 0
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const { sum: { sats } } = await models.vote.aggregate({
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sum: {
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sats: true
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},
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where: {
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itemId: item.id,
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userId: me.id
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}
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})
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return sats || 0
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},
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root: async (item, args, { models }) => {
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if (!item.parentId) {
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return null
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}
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return (await models.$queryRaw(`
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${SELECT}
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FROM "Item"
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WHERE id = (
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SELECT ltree2text(subltree(path, 0, 1))::integer
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FROM "Item"
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WHERE id = $1)`, Number(item.id)))[0]
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},
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parent: async (item, args, { models }) => {
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if (!item.parentId) {
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return null
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}
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return await models.item.findUnique({ where: { id: item.parentId } })
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}
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}
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}
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const createItem = async (parent, { title, url, text, parentId }, { me, models }) => {
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if (!me) {
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throw new AuthenticationError('you must be logged in')
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}
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const [item] = await serialize(models, models.$queryRaw(
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`${SELECT} FROM create_item($1, $2, $3, $4, $5) AS "Item"`,
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title, url, text, Number(parentId), me.name))
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item.comments = []
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return item
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}
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function nestComments (flat, parentId) {
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const result = []
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let added = 0
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for (let i = 0; i < flat.length;) {
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if (!flat[i].comments) flat[i].comments = []
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if (Number(flat[i].parentId) === Number(parentId)) {
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result.push(flat[i])
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added++
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i++
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} else if (result.length > 0) {
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const item = result[result.length - 1]
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const [nested, newAdded] = nestComments(flat.slice(i), item.id)
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if (newAdded === 0) {
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break
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}
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item.comments.push(...nested)
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i += newAdded
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added += newAdded
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} else {
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break
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}
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}
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return [result, added]
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}
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// we have to do our own query because ltree is unsupported
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const SELECT =
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`SELECT "Item".id, "Item".created_at as "createdAt", "Item".updated_at as "updatedAt", "Item".title,
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"Item".text, "Item".url, "Item"."userId", "Item"."parentId", ltree2text("Item"."path") AS "path"`
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function timedLeftJoinSats (num) {
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return `LEFT JOIN (SELECT i.id, SUM("Vote".sats) as sats
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FROM "Item" i
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JOIN "Vote" ON i.id = "Vote"."itemId" AND "Vote".created_at <= $${num}
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GROUP BY i.id) x ON "Item".id = x.id`
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}
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const LEFT_JOIN_SATS =
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`LEFT JOIN (SELECT i.id, SUM("Vote".sats) as sats
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FROM "Item" i
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JOIN "Vote" ON i.id = "Vote"."itemId"
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GROUP BY i.id) x ON "Item".id = x.id`
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function timedOrderBySats (num) {
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return `ORDER BY (x.sats-1)/POWER(EXTRACT(EPOCH FROM ($${num} - "Item".created_at))/3600+2, 1.5) DESC NULLS LAST`
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}
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const ORDER_BY_SATS =
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'ORDER BY (x.sats-1)/POWER(EXTRACT(EPOCH FROM ((NOW() AT TIME ZONE \'UTC\') - "Item".created_at))/3600+2, 1.5) DESC NULLS LAST'
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