graphql/execution/legacyIncremental/BranchingIncrementalPublisher.mjs.map

A Query Language and Runtime which can target any service.

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type { ObjMap } from '../../jsutils/ObjMap.ts';\nimport { addPath, pathToArray } from '../../jsutils/Path.ts';\n\nimport { ensureGraphQLError } from '../../error/ensureGraphQLError.ts';\nimport type { GraphQLError } from '../../error/GraphQLError.ts';\n\nimport type {\n  DeliveryGroup,\n  ExecutionGroupValue,\n  IncrementalWork,\n  ItemStream,\n  StreamItemValue,\n} from '../incremental/IncrementalExecutor.ts';\nimport type { WorkQueueEvent } from '../incremental/WorkQueue.ts';\nimport { createWorkQueue } from '../incremental/WorkQueue.ts';\nimport { mapAsyncIterable } from '../mapAsyncIterable.ts';\nimport { withConcurrentAbruptClose } from '../withConcurrentAbruptClose.ts';\n\nimport type {\n  LegacyExperimentalIncrementalExecutionResults,\n  LegacyIncrementalDeferResult,\n  LegacyIncrementalResult,\n  LegacyIncrementalStreamResult,\n  LegacyInitialIncrementalExecutionResult,\n  LegacySubsequentIncrementalExecutionResult,\n} from './BranchingIncrementalExecutor.ts';\n\ninterface SubsequentIncrementalExecutionResultContext {\n  incremental: Array<LegacyIncrementalResult>;\n  hasNext: boolean;\n}\n\n/** @internal */\nexport class BranchingIncrementalPublisher {\n  private _indices: Map<ItemStream, number>;\n\n  constructor() {\n    this._indices = new Map();\n  }\n\n  buildResponse(\n    data: ObjMap<unknown>,\n    errors: ReadonlyArray<GraphQLError>,\n    work: IncrementalWork,\n    abortSignal: AbortSignal | undefined,\n    onFinished: () => void,\n  ): LegacyExperimentalIncrementalExecutionResults {\n    const { initialStreams, events } = createWorkQueue<\n      ExecutionGroupValue,\n      StreamItemValue,\n      DeliveryGroup,\n      ItemStream\n    >(work);\n\n    for (const stream of initialStreams) {\n      this._indices.set(stream, stream.initialCount);\n    }\n\n    function abort(): void {\n      subsequentResults.throw(abortSignal?.reason).catch(() => {\n        // Ignore errors\n      });\n    }\n\n    if (abortSignal) {\n      abortSignal.addEventListener('abort', abort);\n    }\n    const onWorkQueueFinished = () => {\n      onFinished();\n      abortSignal?.removeEventListener('abort', abort);\n    };\n\n    const initialResult: LegacyInitialIncrementalExecutionResult = errors.length\n      ? { errors, data, hasNext: true }\n      : { data, hasNext: true };\n\n    const subsequentResults = withConcurrentAbruptClose(\n      mapAsyncIterable(events, (batch) =>\n        this._handleBatch(batch, onWorkQueueFinished),\n      ),\n      () => onWorkQueueFinished(),\n    );\n\n    return {\n      initialResult,\n      subsequentResults,\n    };\n  }\n\n  private _handleBatch(\n    batch: ReadonlyArray<\n      WorkQueueEvent<\n        ExecutionGroupValue,\n        StreamItemValue,\n        DeliveryGroup,\n        ItemStream\n      >\n    >,\n    onWorkQueueFinished: (() => void) | undefined,\n  ): LegacySubsequentIncrementalExecutionResult {\n    const context: SubsequentIncrementalExecutionResultContext = {\n      incremental: [],\n      hasNext: true,\n    };\n\n    for (const event of batch) {\n      this._handleWorkQueueEvent(event, context, onWorkQueueFinished);\n    }\n\n    const { incremental, hasNext } = context;\n\n    const result: LegacySubsequentIncrementalExecutionResult = { hasNext };\n    if (incremental.length > 0) {\n      result.incremental = incremental;\n    }\n\n    return result;\n  }\n\n  private _handleWorkQueueEvent(\n    event: WorkQueueEvent<\n      ExecutionGroupValue,\n      StreamItemValue,\n      DeliveryGroup,\n      ItemStream\n    >,\n    context: SubsequentIncrementalExecutionResultContext,\n    onWorkQueueFinished: (() => void) | undefined,\n  ): void {\n    switch (event.kind) {\n      case 'GROUP_VALUES': {\n        const group = event.group;\n        for (const value of event.values) {\n          context.incremental.push(\n            buildIncrementalResult(\n              {\n                data: value.data,\n                path: pathToArray(group.path),\n              },\n              group.label,\n              value.errors,\n            ),\n          );\n        }\n        break;\n      }\n      case 'GROUP_SUCCESS': {\n        break;\n      }\n      case 'GROUP_FAILURE': {\n        const group = event.group;\n        context.incremental.push(\n          buildIncrementalResult(\n            {\n              data: null,\n              path: pathToArray(group.path),\n            },\n            group.label,\n            [ensureGraphQLError(event.error)],\n          ),\n        );\n        break;\n      }\n      case 'STREAM_VALUES': {\n        const stream = event.stream;\n        const { values } = event;\n        const items: Array<unknown> = [];\n        const errors: Array<GraphQLError> = [];\n        for (const value of values) {\n          items.push(value.item);\n          if (value.errors !== undefined) {\n            errors.push(...value.errors);\n          }\n        }\n        let index = this._indices.get(stream);\n        if (index === undefined) {\n          index = stream.initialCount;\n          this._indices.set(stream, index);\n        }\n        this._indices.set(stream, index + items.length);\n        context.incremental.push(\n          buildIncrementalResult(\n            {\n              items,\n              path: pathToArray(addPath(stream.path, index, undefined)),\n            },\n            stream.label,\n            errors.length > 0 ? errors : undefined,\n          ),\n        );\n        break;\n      }\n      case 'STREAM_SUCCESS': {\n        this._indices.delete(event.stream);\n        break;\n      }\n      case 'STREAM_FAILURE': {\n        this._indices.delete(event.stream);\n        const stream = event.stream;\n        context.incremental.push(\n          buildIncrementalResult(\n            {\n              items: null,\n              path: pathToArray(stream.path),\n            },\n            stream.label,\n            [ensureGraphQLError(event.error)],\n          ),\n        );\n        break;\n      }\n      case 'WORK_QUEUE_TERMINATION': {\n        onWorkQueueFinished?.();\n        context.hasNext = false;\n        break;\n      }\n    }\n  }\n}\n\nfunction buildIncrementalResult(\n  originalIncrementalResult:\n    | Omit<LegacyIncrementalDeferResult, 'label' | 'errors'>\n    | Omit<LegacyIncrementalStreamResult, 'label' | 'errors'>,\n  label: string | undefined,\n  errors: ReadonlyArray<GraphQLError> | undefined,\n): LegacyIncrementalResult {\n  const incrementalResult: LegacyIncrementalResult = originalIncrementalResult;\n  if (errors !== undefined) {\n    incrementalResult.errors = errors;\n  }\n  if (label !== undefined) {\n    incrementalResult.label = label;\n  }\n  return incrementalResult;\n}\n"]}