| 1 | 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{ invariant, InvariantError } from '../../utilities/globals';\n\nimport {\n DocumentNode,\n FieldNode,\n Kind,\n SelectionSetNode,\n} from 'graphql';\nimport { wrap, OptimisticWrapperFunction } from 'optimism';\n\nimport {\n isField,\n resultKeyNameFromField,\n Reference,\n isReference,\n makeReference,\n StoreObject,\n FragmentMap,\n shouldInclude,\n addTypenameToDocument,\n getDefaultValues,\n getMainDefinition,\n getQueryDefinition,\n getFragmentFromSelection,\n maybeDeepFreeze,\n mergeDeepArray,\n DeepMerger,\n isNonNullObject,\n canUseWeakMap,\n compact,\n FragmentMapFunction,\n} from '../../utilities';\nimport { Cache } from '../core/types/Cache';\nimport {\n DiffQueryAgainstStoreOptions,\n InMemoryCacheConfig,\n NormalizedCache,\n ReadMergeModifyContext,\n} from './types';\nimport { maybeDependOnExistenceOfEntity, supportsResultCaching } from './entityStore';\nimport { isArray, extractFragmentContext, getTypenameFromStoreObject, shouldCanonizeResults } from './helpers';\nimport { Policies } from './policies';\nimport { InMemoryCache } from './inMemoryCache';\nimport { MissingFieldError, MissingTree } from '../core/types/common';\nimport { canonicalStringify, ObjectCanon } from './object-canon';\n\nexport type VariableMap = { [name: string]: any };\n\ninterface ReadContext extends ReadMergeModifyContext {\n query: DocumentNode;\n policies: Policies;\n canonizeResults: boolean;\n fragmentMap: FragmentMap;\n lookupFragment: FragmentMapFunction;\n};\n\nexport type ExecResult<R = any> = {\n result: R;\n missing?: MissingTree;\n};\n\ntype ExecSelectionSetOptions = {\n selectionSet: SelectionSetNode;\n objectOrReference: StoreObject | Reference;\n enclosingRef: Reference;\n context: ReadContext;\n};\n\ntype ExecSubSelectedArrayOptions = {\n field: FieldNode;\n array: readonly any[];\n enclosingRef: Reference;\n context: ReadContext;\n};\n\nexport interface StoreReaderConfig {\n cache: InMemoryCache,\n addTypename?: boolean;\n resultCacheMaxSize?: number;\n canonizeResults?: boolean;\n canon?: ObjectCanon;\n fragments?: InMemoryCacheConfig[\"fragments\"];\n}\n\n// Arguments type after keyArgs translation.\ntype ExecSelectionSetKeyArgs = [\n SelectionSetNode,\n StoreObject | Reference,\n ReadMergeModifyContext,\n boolean,\n];\n\nfunction execSelectionSetKeyArgs(\n options: ExecSelectionSetOptions,\n): ExecSelectionSetKeyArgs {\n return [\n options.selectionSet,\n options.objectOrReference,\n options.context,\n // We split out this property so we can pass different values\n // independently without modifying options.context itself.\n options.context.canonizeResults,\n ];\n}\n\nexport class StoreReader {\n // cached version of executeSelectionSet\n private executeSelectionSet: OptimisticWrapperFunction<\n [ExecSelectionSetOptions], // Actual arguments tuple type.\n ExecResult, // Actual return type.\n ExecSelectionSetKeyArgs\n >;\n\n // cached version of executeSubSelectedArray\n private executeSubSelectedArray: OptimisticWrapperFunction<\n [ExecSubSelectedArrayOptions],\n ExecResult<any>,\n [ExecSubSelectedArrayOptions]>;\n\n private config: {\n cache: InMemoryCache,\n addTypename: boolean;\n resultCacheMaxSize?: number;\n canonizeResults: boolean;\n fragments?: InMemoryCacheConfig[\"fragments\"];\n };\n\n private knownResults = new (\n canUseWeakMap ? WeakMap : Map\n )<Record<string, any>, SelectionSetNode>();\n\n public canon: ObjectCanon;\n public resetCanon() {\n this.canon = new ObjectCanon;\n }\n\n constructor(config: StoreReaderConfig) {\n this.config = compact(config, {\n addTypename: config.addTypename !== false,\n canonizeResults: shouldCanonizeResults(config),\n });\n\n this.canon = config.canon || new ObjectCanon;\n\n this.executeSelectionSet = wrap(options => {\n const { canonizeResults } = options.context;\n\n const peekArgs = execSelectionSetKeyArgs(options);\n\n // Negate this boolean option so we can find out if we've already read\n // this result using the other boolean value.\n peekArgs[3] = !canonizeResults;\n\n const other = this.executeSelectionSet.peek(...peekArgs);\n\n if (other) {\n if (canonizeResults) {\n return {\n ...other,\n // If we previously read this result without canonizing it, we can\n // reuse that result simply by canonizing it now.\n result: this.canon.admit(other.result),\n };\n }\n // If we previously read this result with canonization enabled, we can\n // return that canonized result as-is.\n return other;\n }\n\n maybeDependOnExistenceOfEntity(\n options.context.store,\n options.enclosingRef.__ref,\n );\n\n // Finally, if we didn't find any useful previous results, run the real\n // execSelectionSetImpl method with the given options.\n return this.execSelectionSetImpl(options);\n\n }, {\n max: this.config.resultCacheMaxSize,\n keyArgs: execSelectionSetKeyArgs,\n // Note that the parameters of makeCacheKey are determined by the\n // array returned by keyArgs.\n makeCacheKey(selectionSet, parent, context, canonizeResults) {\n if (supportsResultCaching(context.store)) {\n return context.store.makeCacheKey(\n selectionSet,\n isReference(parent) ? parent.__ref : parent,\n context.varString,\n canonizeResults,\n );\n }\n }\n });\n\n this.executeSubSelectedArray = wrap((options: ExecSubSelectedArrayOptions) => {\n maybeDependOnExistenceOfEntity(\n options.context.store,\n options.enclosingRef.__ref,\n );\n return this.execSubSelectedArrayImpl(options);\n }, {\n max: this.config.resultCacheMaxSize,\n makeCacheKey({ field, array, context }) {\n if (supportsResultCaching(context.store)) {\n return context.store.makeCacheKey(\n field,\n array,\n context.varString,\n );\n }\n }\n });\n }\n\n /**\n * Given a store and a query, return as much of the result as possible and\n * identify if any data was missing from the store.\n * @param {DocumentNode} query A parsed GraphQL query document\n * @param {Store} store The Apollo Client store object\n * @return {result: Object, complete: [boolean]}\n */\n public diffQueryAgainstStore<T>({\n store,\n query,\n rootId = 'ROOT_QUERY',\n variables,\n returnPartialData = true,\n canonizeResults = this.config.canonizeResults,\n }: DiffQueryAgainstStoreOptions): Cache.DiffResult<T> {\n const policies = this.config.cache.policies;\n\n variables = {\n ...getDefaultValues(getQueryDefinition(query)),\n ...variables!,\n };\n\n const rootRef = makeReference(rootId);\n const execResult = this.executeSelectionSet({\n selectionSet: getMainDefinition(query).selectionSet,\n objectOrReference: rootRef,\n enclosingRef: rootRef,\n context: {\n store,\n query,\n policies,\n variables,\n varString: canonicalStringify(variables),\n canonizeResults,\n ...extractFragmentContext(query, this.config.fragments),\n },\n });\n\n let missing: MissingFieldError[] | undefined;\n if (execResult.missing) {\n // For backwards compatibility we still report an array of\n // MissingFieldError objects, even though there will only ever be at most\n // one of them, now that all missing field error messages are grouped\n // together in the execResult.missing tree.\n missing = [new MissingFieldError(\n firstMissing(execResult.missing)!,\n execResult.missing,\n query,\n variables,\n )];\n if (!returnPartialData) {\n throw missing[0];\n }\n }\n\n return {\n result: execResult.result,\n complete: !missing,\n missing,\n };\n }\n\n public isFresh(\n result: Record<string, any>,\n parent: StoreObject | Reference,\n selectionSet: SelectionSetNode,\n context: ReadMergeModifyContext,\n ): boolean {\n if (supportsResultCaching(context.store) &&\n this.knownResults.get(result) === selectionSet) {\n const latest = this.executeSelectionSet.peek(\n selectionSet,\n parent,\n context,\n // If result is canonical, then it could only have been previously\n // cached by the canonizing version of executeSelectionSet, so we can\n // avoid checking both possibilities here.\n this.canon.isKnown(result),\n );\n if (latest && result === latest.result) {\n return true;\n }\n }\n return false;\n }\n\n // Uncached version of executeSelectionSet.\n private execSelectionSetImpl({\n selectionSet,\n objectOrReference,\n enclosingRef,\n context,\n }: ExecSelectionSetOptions): ExecResult {\n if (isReference(objectOrReference) &&\n !context.policies.rootTypenamesById[objectOrReference.__ref] &&\n !context.store.has(objectOrReference.__ref)) {\n return {\n result: this.canon.empty,\n missing: `Dangling reference to missing ${objectOrReference.__ref} object`,\n };\n }\n\n const { variables, policies, store } = context;\n const typename = store.getFieldValue<string>(objectOrReference, \"__typename\");\n\n const objectsToMerge: Record<string, any>[] = [];\n let missing: MissingTree | undefined;\n const missingMerger = new DeepMerger();\n\n if (this.config.addTypename &&\n typeof typename === \"string\" &&\n !policies.rootIdsByTypename[typename]) {\n // Ensure we always include a default value for the __typename\n // field, if we have one, and this.config.addTypename is true. Note\n // that this field can be overridden by other merged objects.\n objectsToMerge.push({ __typename: typename });\n }\n\n function handleMissing<T>(result: ExecResult<T>, resultName: string): T {\n if (result.missing) {\n missing = missingMerger.merge(missing, { [resultName]: result.missing });\n }\n return result.result;\n }\n\n const workSet = new Set(selectionSet.selections);\n\n workSet.forEach(selection => {\n // Omit fields with directives @skip(if: <truthy value>) or\n // @include(if: <falsy value>).\n if (!shouldInclude(selection, variables)) return;\n\n if (isField(selection)) {\n let fieldValue = policies.readField({\n fieldName: selection.name.value,\n field: selection,\n variables: context.variables,\n from: objectOrReference,\n }, context);\n\n const resultName = resultKeyNameFromField(selection);\n\n if (fieldValue === void 0) {\n if (!addTypenameToDocument.added(selection)) {\n missing = missingMerger.merge(missing, {\n [resultName]: `Can't find field '${\n selection.name.value\n }' on ${\n isReference(objectOrReference)\n ? objectOrReference.__ref + \" object\"\n : \"object \" + JSON.stringify(objectOrReference, null, 2)\n }`\n });\n }\n\n } else if (isArray(fieldValue)) {\n fieldValue = handleMissing(this.executeSubSelectedArray({\n field: selection,\n array: fieldValue,\n enclosingRef,\n context,\n }), resultName);\n\n } else if (!selection.selectionSet) {\n // If the field does not have a selection set, then we handle it\n // as a scalar value. To keep this.canon from canonicalizing\n // this value, we use this.canon.pass to wrap fieldValue in a\n // Pass object that this.canon.admit will later unwrap as-is.\n if (context.canonizeResults) {\n fieldValue = this.canon.pass(fieldValue);\n }\n\n } else if (fieldValue != null) {\n // In this case, because we know the field has a selection set,\n // it must be trying to query a GraphQLObjectType, which is why\n // fieldValue must be != null.\n fieldValue = handleMissing(this.executeSelectionSet({\n selectionSet: selection.selectionSet,\n objectOrReference: fieldValue as StoreObject | Reference,\n enclosingRef: isReference(fieldValue) ? fieldValue : enclosingRef,\n context,\n }), resultName);\n }\n\n if (fieldValue !== void 0) {\n objectsToMerge.push({ [resultName]: fieldValue });\n }\n\n } else {\n const fragment = getFragmentFromSelection(\n selection,\n context.lookupFragment,\n );\n\n if (!fragment && selection.kind === Kind.FRAGMENT_SPREAD) {\n throw new InvariantError(`No fragment named ${selection.name.value}`);\n }\n\n if (fragment && policies.fragmentMatches(fragment, typename)) {\n fragment.selectionSet.selections.forEach(workSet.add, workSet);\n }\n }\n });\n\n const result = mergeDeepArray(objectsToMerge);\n const finalResult: ExecResult = { result, missing };\n const frozen = context.canonizeResults\n ? this.canon.admit(finalResult)\n // Since this.canon is normally responsible for freezing results (only in\n // development), freeze them manually if canonization is disabled.\n : maybeDeepFreeze(finalResult);\n\n // Store this result with its selection set so that we can quickly\n // recognize it again in the StoreReader#isFresh method.\n if (frozen.result) {\n this.knownResults.set(frozen.result, selectionSet);\n }\n\n return frozen;\n }\n\n // Uncached version of executeSubSelectedArray.\n private execSubSelectedArrayImpl({\n field,\n array,\n enclosingRef,\n context,\n }: ExecSubSelectedArrayOptions): ExecResult {\n let missing: MissingTree | undefined;\n let missingMerger = new DeepMerger<MissingTree[]>();\n\n function handleMissing<T>(childResult: ExecResult<T>, i: number): T {\n if (childResult.missing) {\n missing = missingMerger.merge(missing, { [i]: childResult.missing });\n }\n return childResult.result;\n }\n\n if (field.selectionSet) {\n array = array.filter(context.store.canRead);\n }\n\n array = array.map((item, i) => {\n // null value in array\n if (item === null) {\n return null;\n }\n\n // This is a nested array, recurse\n if (isArray(item)) {\n return handleMissing(this.executeSubSelectedArray({\n field,\n array: item,\n enclosingRef,\n context,\n }), i);\n }\n\n // This is an object, run the selection set on it\n if (field.selectionSet) {\n return handleMissing(this.executeSelectionSet({\n selectionSet: field.selectionSet,\n objectOrReference: item,\n enclosingRef: isReference(item) ? item : enclosingRef,\n context,\n }), i);\n }\n\n if (__DEV__) {\n assertSelectionSetForIdValue(context.store, field, item);\n }\n\n return item;\n });\n\n return {\n result: context.canonizeResults ? this.canon.admit(array) : array,\n missing,\n };\n }\n}\n\nfunction firstMissing(tree: MissingTree): string | undefined {\n try {\n JSON.stringify(tree, (_, value) => {\n if (typeof value === \"string\") throw value;\n return value;\n });\n } catch (result) {\n return result;\n }\n}\n\nfunction assertSelectionSetForIdValue(\n store: NormalizedCache,\n field: FieldNode,\n fieldValue: any,\n) {\n if (!field.selectionSet) {\n const workSet = new Set([fieldValue]);\n workSet.forEach(value => {\n if (isNonNullObject(value)) {\n invariant(\n !isReference(value),\n `Missing selection set for object of type ${\n getTypenameFromStoreObject(store, value)\n } returned for query field ${field.name.value}`,\n );\n Object.values(value).forEach(workSet.add, workSet);\n }\n });\n }\n}\n"]} |