stacker.news/lib/apollo.js

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import { ApolloClient, InMemoryCache, from, HttpLink } from '@apollo/client'
import { decodeCursor, LIMIT } from './cursor'
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import { RetryLink } from '@apollo/client/link/retry'
const additiveLink = from([
new RetryLink(),
new HttpLink({ uri: '/api/graphql' })
])
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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
}
}
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export default function getApolloClient () {
global.apolloClient ||= new ApolloClient({
link: additiveLink,
cache: new InMemoryCache({
typePolicies: {
Query: {
fields: {
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topUsers: {
keyArgs: ['within'],
merge (existing, incoming) {
if (isFirstPage(incoming.cursor, existing?.users)) {
return incoming
}
return {
cursor: incoming.cursor,
users: [...(existing?.users || []), ...incoming.users]
}
}
},
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moreItems: {
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keyArgs: ['sort', 'name', 'within'],
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merge (existing, incoming) {
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if (isFirstPage(incoming.cursor, existing?.items)) {
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return incoming
}
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return {
cursor: incoming.cursor,
items: [...(existing?.items || []), ...incoming.items]
}
}
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},
moreFlatComments: {
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keyArgs: ['name', 'sort', 'within'],
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merge (existing, incoming) {
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if (isFirstPage(incoming.cursor, existing?.comments)) {
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return incoming
}
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return {
cursor: incoming.cursor,
comments: [...(existing?.comments || []), ...incoming.comments]
}
}
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},
notifications: {
keyArgs: false,
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,
notifications: [...(existing?.notifications || []), ...incoming.notifications],
lastChecked: incoming.lastChecked
}
}
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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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}),
defaultOptions: {
// cache-and-network allows us to refresh pages on navigation
watchQuery: {
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fetchPolicy: 'cache-only',
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nextFetchPolicy: 'cache-first'
},
query: {
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fetchPolicy: 'cache-only',
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nextFetchPolicy: 'cache-first'
}
}
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})
return global.apolloClient
}