stacker.news/lib/apollo.js

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import { ApolloClient, InMemoryCache, HttpLink } from '@apollo/client'
import { decodeCursor, LIMIT } from './cursor'
import { SSR } from './constants'
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function isFirstPage (cursor, existingThings) {
if (cursor) {
const decursor = decodeCursor(cursor)
return decursor.offset === LIMIT
} else {
// we don't have anything cached, or our existing items are less than
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// or equal to a full page
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return existingThings?.length < LIMIT
}
}
const defaultFetchPolicy = SSR ? 'cache-only' : 'cache-first'
const defaultNextFetchPolicy = SSR ? 'cache-only' : 'cache-first'
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export default function getApolloClient () {
if (SSR) {
return getClient(`${process.env.SELF_URL}/api/graphql`)
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} else {
global.apolloClient ||= getClient('/api/graphql')
return global.apolloClient
}
}
function getClient (uri) {
return new ApolloClient({
link: new HttpLink({ uri }),
ssrMode: SSR,
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cache: new InMemoryCache({
freezeResults: true,
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typePolicies: {
Query: {
fields: {
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topUsers: {
keyArgs: ['when', 'by'],
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merge (existing, incoming) {
if (isFirstPage(incoming.cursor, existing?.users)) {
return incoming
}
return {
cursor: incoming.cursor,
users: [...(existing?.users || []), ...incoming.users]
}
}
},
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topCowboys: {
keyArgs: [],
merge (existing, incoming) {
if (isFirstPage(incoming.cursor, existing?.users)) {
return incoming
}
return {
cursor: incoming.cursor,
users: [...(existing?.users || []), ...incoming.users]
}
}
},
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items: {
keyArgs: ['sub', 'sort', 'type', 'name', 'when', 'by'],
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merge (existing, incoming) {
if (isFirstPage(incoming.cursor, existing?.items)) {
return incoming
}
return {
cursor: incoming.cursor,
items: [...(existing?.items || []), ...incoming.items],
pins: existing?.pins || null
}
}
},
comments: {
keyArgs: ['id', 'sort'],
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merge (existing, incoming) {
return incoming
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}
},
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related: {
keyArgs: ['id', 'title', 'minMatch', 'limit'],
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merge (existing, incoming) {
if (isFirstPage(incoming.cursor, existing?.items)) {
return incoming
}
return {
cursor: incoming.cursor,
items: [...(existing?.items || []), ...incoming.items]
}
}
},
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search: {
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keyArgs: ['q', 'sub', 'sort', 'what', 'when'],
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merge (existing, incoming) {
if (isFirstPage(incoming.cursor, existing?.items)) {
return incoming
}
return {
cursor: incoming.cursor,
items: [...(existing?.items || []), ...incoming.items]
}
}
},
searchUsers: {
keyArgs: ['q', 'limit', 'similarity'],
merge (existing, incoming) {
return [...(existing?.searchUsers || []), ...incoming]
}
},
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notifications: {
keyArgs: ['inc'],
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merge (existing, incoming) {
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if (isFirstPage(incoming.cursor, existing?.notifications)) {
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return incoming
}
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return {
cursor: incoming.cursor,
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earn: existing?.earn || incoming.earn,
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notifications: [...(existing?.notifications || []), ...incoming.notifications],
lastChecked: existing?.lastChecked || incoming.lastChecked
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}
}
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},
walletHistory: {
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keyArgs: ['inc'],
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merge (existing, incoming) {
if (isFirstPage(incoming.cursor, existing?.facts)) {
return incoming
}
return {
cursor: incoming.cursor,
facts: [...(existing?.facts || []), ...incoming.facts]
}
}
}
}
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},
Item: {
fields: {
meAnonSats: {
read (meAnonSats, { readField }) {
if (typeof window === 'undefined') return null
const itemId = readField('id')
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return meAnonSats ?? Number(window.localStorage.getItem(`TIP-item:${itemId}`) || '0')
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}
}
}
}
}
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}),
assumeImmutableResults: true,
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defaultOptions: {
watchQuery: {
initialFetchPolicy: defaultFetchPolicy,
fetchPolicy: defaultFetchPolicy,
nextFetchPolicy: defaultNextFetchPolicy,
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canonizeResults: true,
ssr: SSR
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},
query: {
initialFetchPolicy: defaultFetchPolicy,
fetchPolicy: defaultFetchPolicy,
nextFetchPolicy: defaultNextFetchPolicy,
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canonizeResults: true,
ssr: SSR
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}
}
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})
}