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{ equal } from \"@wry/equality\";\nimport type {\n ApolloError,\n ApolloQueryResult,\n ObservableQuery,\n OperationVariables,\n WatchQueryOptions,\n} from \"../../../core/index.js\";\nimport type {\n ObservableSubscription,\n PromiseWithState,\n} from \"../../../utilities/index.js\";\nimport {\n createFulfilledPromise,\n createRejectedPromise,\n} from \"../../../utilities/index.js\";\nimport type { QueryKey } from \"./types.js\";\nimport type { useBackgroundQuery, useReadQuery } from \"../../hooks/index.js\";\nimport { wrapPromiseWithState } from \"../../../utilities/index.js\";\n\ntype QueryRefPromise<TData> = PromiseWithState<ApolloQueryResult<TData>>;\n\ntype Listener<TData> = (promise: QueryRefPromise<TData>) => void;\n\ntype FetchMoreOptions<TData> = Parameters<\n ObservableQuery<TData>[\"fetchMore\"]\n>[0];\n\nconst QUERY_REFERENCE_SYMBOL: unique symbol = Symbol();\nconst PROMISE_SYMBOL: unique symbol = Symbol();\n\n/**\n * A `QueryReference` is an opaque object returned by {@link useBackgroundQuery}.\n * A child component reading the `QueryReference` via {@link useReadQuery} will\n * suspend until the promise resolves.\n */\nexport interface QueryReference<TData = unknown, TVariables = unknown> {\n /** @internal */\n readonly [QUERY_REFERENCE_SYMBOL]: InternalQueryReference<TData>;\n /** @internal */\n [PROMISE_SYMBOL]: QueryRefPromise<TData>;\n /**\n * A function that returns a promise that resolves when the query has finished\n * loading. The promise resolves with the `QueryReference` itself.\n *\n * @remarks\n * This method is useful for preloading queries in data loading routers, such\n * as [React Router](https://reactrouter.com/en/main) or [TanStack Router](https://tanstack.com/router),\n * to prevent routes from transitioning until the query has finished loading.\n * `data` is not exposed on the promise to discourage using the data in\n * `loader` functions and exposing it to your route components. Instead, we\n * prefer you rely on `useReadQuery` to access the data to ensure your\n * component can rerender with cache updates. If you need to access raw query\n * data, use `client.query()` directly.\n *\n * @example\n * Here's an example using React Router's `loader` function:\n * ```ts\n * import { createQueryPreloader } from \"@apollo/client\";\n *\n * const preloadQuery = createQueryPreloader(client);\n *\n * export async function loader() {\n * const queryRef = preloadQuery(GET_DOGS_QUERY);\n *\n * return queryRef.toPromise();\n * }\n *\n * export function RouteComponent() {\n * const queryRef = useLoaderData();\n * const { data } = useReadQuery(queryRef);\n *\n * // ...\n * }\n * ```\n *\n * @alpha\n */\n toPromise(): Promise<QueryReference<TData, TVariables>>;\n}\n\ninterface InternalQueryReferenceOptions {\n onDispose?: () => void;\n autoDisposeTimeoutMs?: number;\n}\n\nexport function wrapQueryRef<TData, TVariables extends OperationVariables>(\n internalQueryRef: InternalQueryReference<TData>\n) {\n const ref: QueryReference<TData, TVariables> = {\n toPromise() {\n // We avoid resolving this promise with the query data because we want to\n // discourage using the server data directly from the queryRef. Instead,\n // the data should be accessed through `useReadQuery`. When the server\n // data is needed, its better to use `client.query()` directly.\n //\n // Here we resolve with the ref itself to make using this in React Router\n // or TanStack Router `loader` functions a bit more ergonomic e.g.\n //\n // function loader() {\n // return { queryRef: await preloadQuery(query).toPromise() }\n // }\n return getWrappedPromise(ref).then(() => ref);\n },\n [QUERY_REFERENCE_SYMBOL]: internalQueryRef,\n [PROMISE_SYMBOL]: internalQueryRef.promise,\n };\n\n return ref;\n}\n\nexport function getWrappedPromise<TData>(queryRef: QueryReference<TData, any>) {\n const internalQueryRef = unwrapQueryRef(queryRef);\n\n return internalQueryRef.promise.status === \"fulfilled\" ?\n internalQueryRef.promise\n : queryRef[PROMISE_SYMBOL];\n}\n\nexport function unwrapQueryRef<TData>(\n queryRef: QueryReference<TData>\n): InternalQueryReference<TData> {\n return queryRef[QUERY_REFERENCE_SYMBOL];\n}\n\nexport function updateWrappedQueryRef<TData>(\n queryRef: QueryReference<TData>,\n promise: QueryRefPromise<TData>\n) {\n queryRef[PROMISE_SYMBOL] = promise;\n}\n\nconst OBSERVED_CHANGED_OPTIONS = [\n \"canonizeResults\",\n \"context\",\n \"errorPolicy\",\n \"fetchPolicy\",\n \"refetchWritePolicy\",\n \"returnPartialData\",\n] as const;\n\ntype ObservedOptions = Pick<\n WatchQueryOptions,\n (typeof OBSERVED_CHANGED_OPTIONS)[number]\n>;\n\nexport class InternalQueryReference<TData = unknown> {\n public result!: ApolloQueryResult<TData>;\n public readonly key: QueryKey = {};\n public readonly observable: ObservableQuery<TData>;\n\n public promise!: QueryRefPromise<TData>;\n\n private subscription!: ObservableSubscription;\n private listeners = new Set<Listener<TData>>();\n private autoDisposeTimeoutId?: NodeJS.Timeout;\n\n private resolve: ((result: ApolloQueryResult<TData>) => void) | undefined;\n private reject: ((error: unknown) => void) | undefined;\n\n private references = 0;\n\n constructor(\n observable: ObservableQuery<TData, any>,\n options: InternalQueryReferenceOptions\n ) {\n this.handleNext = this.handleNext.bind(this);\n this.handleError = this.handleError.bind(this);\n this.dispose = this.dispose.bind(this);\n this.observable = observable;\n\n if (options.onDispose) {\n this.onDispose = options.onDispose;\n }\n\n this.setResult();\n this.subscribeToQuery();\n\n // Start a timer that will automatically dispose of the query if the\n // suspended resource does not use this queryRef in the given time. This\n // helps prevent memory leaks when a component has unmounted before the\n // query has finished loading.\n const startDisposeTimer = () => {\n if (!this.references) {\n this.autoDisposeTimeoutId = setTimeout(\n this.dispose,\n options.autoDisposeTimeoutMs ?? 30_000\n );\n }\n };\n\n // We wait until the request has settled to ensure we don't dispose of the\n // query ref before the request finishes, otherwise we would leave the\n // promise in a pending state rendering the suspense boundary indefinitely.\n this.promise.then(startDisposeTimer, startDisposeTimer);\n }\n\n get disposed() {\n return this.subscription.closed;\n }\n\n get watchQueryOptions() {\n return this.observable.options;\n }\n\n reinitialize() {\n const { observable } = this;\n\n const originalFetchPolicy = this.watchQueryOptions.fetchPolicy;\n\n try {\n if (originalFetchPolicy !== \"no-cache\") {\n observable.resetLastResults();\n observable.silentSetOptions({ fetchPolicy: \"cache-first\" });\n } else {\n observable.silentSetOptions({ fetchPolicy: \"standby\" });\n }\n\n this.subscribeToQuery();\n\n if (originalFetchPolicy === \"no-cache\") {\n return;\n }\n\n observable.resetDiff();\n this.setResult();\n } finally {\n observable.silentSetOptions({ fetchPolicy: originalFetchPolicy });\n }\n }\n\n retain() {\n this.references++;\n clearTimeout(this.autoDisposeTimeoutId);\n let disposed = false;\n\n return () => {\n if (disposed) {\n return;\n }\n\n disposed = true;\n this.references--;\n\n // Wait before fully disposing in case the app is running in strict mode.\n setTimeout(() => {\n if (!this.references) {\n this.dispose();\n }\n });\n };\n }\n\n didChangeOptions(watchQueryOptions: ObservedOptions) {\n return OBSERVED_CHANGED_OPTIONS.some(\n (option) =>\n !equal(this.watchQueryOptions[option], watchQueryOptions[option])\n );\n }\n\n applyOptions(watchQueryOptions: ObservedOptions) {\n const {\n fetchPolicy: currentFetchPolicy,\n canonizeResults: currentCanonizeResults,\n } = this.watchQueryOptions;\n\n // \"standby\" is used when `skip` is set to `true`. Detect when we've\n // enabled the query (i.e. `skip` is `false`) to execute a network request.\n if (\n currentFetchPolicy === \"standby\" &&\n currentFetchPolicy !== watchQueryOptions.fetchPolicy\n ) {\n this.initiateFetch(this.observable.reobserve(watchQueryOptions));\n } else {\n this.observable.silentSetOptions(watchQueryOptions);\n\n if (currentCanonizeResults !== watchQueryOptions.canonizeResults) {\n this.result = { ...this.result, ...this.observable.getCurrentResult() };\n this.promise = createFulfilledPromise(this.result);\n }\n }\n\n return this.promise;\n }\n\n listen(listener: Listener<TData>) {\n this.listeners.add(listener);\n\n return () => {\n this.listeners.delete(listener);\n };\n }\n\n refetch(variables: OperationVariables | undefined) {\n return this.initiateFetch(this.observable.refetch(variables));\n }\n\n fetchMore(options: FetchMoreOptions<TData>) {\n return this.initiateFetch(this.observable.fetchMore<TData>(options));\n }\n\n private dispose() {\n this.subscription.unsubscribe();\n this.onDispose();\n }\n\n private onDispose() {\n // noop. overridable by options\n }\n\n private handleNext(result: ApolloQueryResult<TData>) {\n switch (this.promise.status) {\n case \"pending\": {\n // Maintain the last successful `data` value if the next result does not\n // have one.\n if (result.data === void 0) {\n result.data = this.result.data;\n }\n this.result = result;\n this.resolve?.(result);\n break;\n }\n default: {\n // This occurs when switching to a result that is fully cached when this\n // class is instantiated. ObservableQuery will run reobserve when\n // subscribing, which delivers a result from the cache.\n if (\n result.data === this.result.data &&\n result.networkStatus === this.result.networkStatus\n ) {\n return;\n }\n\n // Maintain the last successful `data` value if the next result does not\n // have one.\n if (result.data === void 0) {\n result.data = this.result.data;\n }\n\n this.result = result;\n this.promise = createFulfilledPromise(result);\n this.deliver(this.promise);\n break;\n }\n }\n }\n\n private handleError(error: ApolloError) {\n this.subscription.unsubscribe();\n this.subscription = this.observable.resubscribeAfterError(\n this.handleNext,\n this.handleError\n );\n\n switch (this.promise.status) {\n case \"pending\": {\n this.reject?.(error);\n break;\n }\n default: {\n this.promise = createRejectedPromise<ApolloQueryResult<TData>>(error);\n this.deliver(this.promise);\n }\n }\n }\n\n private deliver(promise: QueryRefPromise<TData>) {\n this.listeners.forEach((listener) => listener(promise));\n }\n\n private initiateFetch(returnedPromise: Promise<ApolloQueryResult<TData>>) {\n this.promise = this.createPendingPromise();\n this.promise.catch(() => {});\n\n // If the data returned from the fetch is deeply equal to the data already\n // in the cache, `handleNext` will not be triggered leaving the promise we\n // created in a pending state forever. To avoid this situtation, we attempt\n // to resolve the promise if `handleNext` hasn't been run to ensure the\n // promise is resolved correctly.\n returnedPromise\n .then((result) => {\n if (this.promise.status === \"pending\") {\n this.result = result;\n this.resolve?.(result);\n }\n })\n .catch(() => {});\n\n return returnedPromise;\n }\n\n private subscribeToQuery() {\n this.subscription = this.observable\n .filter(\n (result) => !equal(result.data, {}) && !equal(result, this.result)\n )\n .subscribe(this.handleNext, this.handleError);\n }\n\n private setResult() {\n // Don't save this result as last result to prevent delivery of last result\n // when first subscribing\n const result = this.observable.getCurrentResult(false);\n\n if (equal(result, this.result)) {\n return;\n }\n\n this.result = result;\n this.promise =\n (\n result.data &&\n (!result.partial || this.watchQueryOptions.returnPartialData)\n ) ?\n createFulfilledPromise(result)\n : this.createPendingPromise();\n }\n\n private createPendingPromise() {\n return wrapPromiseWithState(\n new Promise<ApolloQueryResult<TData>>((resolve, reject) => {\n this.resolve = resolve;\n this.reject = reject;\n })\n );\n }\n}\n"]} |