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minimizes the changes to `CollectFields` required for incremental delivery (inspired by graphql#3982) -- but retains a single memoized incremental field plan per list item.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| import { getBySet } from '../jsutils/getBySet.js'; | ||
| import { isSameSet } from '../jsutils/isSameSet.js'; | ||
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| import type { DeferUsage, FieldDetails } from './collectFields.js'; | ||
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| export type DeferUsageSet = ReadonlySet<DeferUsage>; | ||
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| export interface FieldGroup { | ||
| fields: ReadonlyArray<FieldDetails>; | ||
| deferUsages?: DeferUsageSet | undefined; | ||
| knownDeferUsages?: DeferUsageSet | undefined; | ||
| } | ||
|
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| export type GroupedFieldSet = Map<string, FieldGroup>; | ||
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| export interface NewGroupedFieldSetDetails { | ||
| groupedFieldSet: GroupedFieldSet; | ||
| shouldInitiateDefer: boolean; | ||
| } | ||
|
|
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| export function buildFieldPlan( | ||
| fields: Map<string, ReadonlyArray<FieldDetails>>, | ||
| parentDeferUsages: DeferUsageSet = new Set<DeferUsage>(), | ||
| knownDeferUsages: DeferUsageSet = new Set<DeferUsage>(), | ||
| ): { | ||
| groupedFieldSet: GroupedFieldSet; | ||
| newGroupedFieldSetDetailsMap: Map<DeferUsageSet, NewGroupedFieldSetDetails>; | ||
| newDeferUsages: ReadonlyArray<DeferUsage>; | ||
| } { | ||
| const newDeferUsages: Set<DeferUsage> = new Set<DeferUsage>(); | ||
| const newKnownDeferUsages = new Set<DeferUsage>(knownDeferUsages); | ||
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| const groupedFieldSet = new Map< | ||
| string, | ||
| { | ||
| fields: Array<FieldDetails>; | ||
| deferUsages: DeferUsageSet; | ||
| knownDeferUsages: DeferUsageSet; | ||
| } | ||
| >(); | ||
|
|
||
| const newGroupedFieldSetDetailsMap = new Map< | ||
| DeferUsageSet, | ||
| { | ||
| groupedFieldSet: Map< | ||
| string, | ||
| { | ||
| fields: Array<FieldDetails>; | ||
| deferUsages: DeferUsageSet; | ||
| knownDeferUsages: DeferUsageSet; | ||
| } | ||
| >; | ||
| shouldInitiateDefer: boolean; | ||
| } | ||
| >(); | ||
|
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| const map = new Map< | ||
| string, | ||
| { | ||
| deferUsageSet: DeferUsageSet; | ||
| fieldDetailsList: ReadonlyArray<FieldDetails>; | ||
| } | ||
| >(); | ||
|
|
||
| for (const [responseKey, fieldDetailsList] of fields) { | ||
| const deferUsageSet = new Set<DeferUsage>(); | ||
| let inOriginalResult = false; | ||
| for (const fieldDetails of fieldDetailsList) { | ||
| const deferUsage = fieldDetails.deferUsage; | ||
| if (deferUsage === undefined) { | ||
| inOriginalResult = true; | ||
| continue; | ||
| } | ||
| deferUsageSet.add(deferUsage); | ||
| if (!knownDeferUsages.has(deferUsage)) { | ||
| newDeferUsages.add(deferUsage); | ||
| newKnownDeferUsages.add(deferUsage); | ||
| } | ||
| } | ||
| if (inOriginalResult) { | ||
| deferUsageSet.clear(); | ||
| } else { | ||
| deferUsageSet.forEach((deferUsage) => { | ||
| const ancestors = getAncestors(deferUsage); | ||
| for (const ancestor of ancestors) { | ||
| if (deferUsageSet.has(ancestor)) { | ||
| deferUsageSet.delete(deferUsage); | ||
| } | ||
| } | ||
| }); | ||
| } | ||
| map.set(responseKey, { deferUsageSet, fieldDetailsList }); | ||
| } | ||
|
|
||
| for (const [responseKey, { deferUsageSet, fieldDetailsList }] of map) { | ||
| if (isSameSet(deferUsageSet, parentDeferUsages)) { | ||
| let fieldGroup = groupedFieldSet.get(responseKey); | ||
| if (fieldGroup === undefined) { | ||
| fieldGroup = { | ||
| fields: [], | ||
| deferUsages: deferUsageSet, | ||
| knownDeferUsages: newKnownDeferUsages, | ||
| }; | ||
| groupedFieldSet.set(responseKey, fieldGroup); | ||
| } | ||
| fieldGroup.fields.push(...fieldDetailsList); | ||
| continue; | ||
| } | ||
|
|
||
| let newGroupedFieldSetDetails = getBySet( | ||
| newGroupedFieldSetDetailsMap, | ||
| deferUsageSet, | ||
| ); | ||
| let newGroupedFieldSet; | ||
| if (newGroupedFieldSetDetails === undefined) { | ||
| newGroupedFieldSet = new Map< | ||
| string, | ||
| { | ||
| fields: Array<FieldDetails>; | ||
| deferUsages: DeferUsageSet; | ||
| knownDeferUsages: DeferUsageSet; | ||
| } | ||
| >(); | ||
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| newGroupedFieldSetDetails = { | ||
| groupedFieldSet: newGroupedFieldSet, | ||
| shouldInitiateDefer: Array.from(deferUsageSet).some( | ||
| (deferUsage) => !parentDeferUsages.has(deferUsage), | ||
| ), | ||
| }; | ||
| newGroupedFieldSetDetailsMap.set( | ||
| deferUsageSet, | ||
| newGroupedFieldSetDetails, | ||
| ); | ||
| } else { | ||
| newGroupedFieldSet = newGroupedFieldSetDetails.groupedFieldSet; | ||
| } | ||
| let fieldGroup = newGroupedFieldSet.get(responseKey); | ||
| if (fieldGroup === undefined) { | ||
| fieldGroup = { | ||
| fields: [], | ||
| deferUsages: deferUsageSet, | ||
| knownDeferUsages: newKnownDeferUsages, | ||
| }; | ||
| newGroupedFieldSet.set(responseKey, fieldGroup); | ||
| } | ||
| fieldGroup.fields.push(...fieldDetailsList); | ||
| } | ||
|
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||
| return { | ||
| groupedFieldSet, | ||
| newGroupedFieldSetDetailsMap, | ||
| newDeferUsages: Array.from(newDeferUsages), | ||
| }; | ||
| } | ||
|
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| function getAncestors(deferUsage: DeferUsage): ReadonlyArray<DeferUsage> { | ||
| const ancestors: Array<DeferUsage> = []; | ||
| let parentDeferUsage: DeferUsage | undefined = deferUsage.parentDeferUsage; | ||
| while (parentDeferUsage !== undefined) { | ||
| ancestors.unshift(parentDeferUsage); | ||
| parentDeferUsage = parentDeferUsage.parentDeferUsage; | ||
| } | ||
| return ancestors; | ||
| } |
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