mirror of
https://github.com/denoland/deno.git
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2403 lines
72 KiB
TypeScript
2403 lines
72 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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// This code closely follows the WHATWG Stream Specification
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// See: https://streams.spec.whatwg.org/
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//
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// There are some parts that are not fully implemented, and there are some
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// comments which point to steps of the specification that are not implemented.
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/* eslint-disable @typescript-eslint/no-explicit-any,require-await */
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import { ReadableByteStreamControllerImpl } from "./readable_byte_stream_controller.ts";
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import { ReadableStreamDefaultControllerImpl } from "./readable_stream_default_controller.ts";
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import { ReadableStreamDefaultReaderImpl } from "./readable_stream_default_reader.ts";
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import { ReadableStreamImpl } from "./readable_stream.ts";
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import * as sym from "./symbols.ts";
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import type { TransformStreamImpl } from "./transform_stream.ts";
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import { TransformStreamDefaultControllerImpl } from "./transform_stream_default_controller.ts";
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import { WritableStreamDefaultControllerImpl } from "./writable_stream_default_controller.ts";
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import { WritableStreamDefaultWriterImpl } from "./writable_stream_default_writer.ts";
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import { WritableStreamImpl } from "./writable_stream.ts";
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import { AbortSignalImpl } from "../abort_signal.ts";
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import { DOMExceptionImpl as DOMException } from "../dom_exception.ts";
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import { cloneValue, setFunctionName } from "../util.ts";
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import { assert, AssertionError } from "../../util.ts";
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export type AbortAlgorithm = (reason?: any) => PromiseLike<void>;
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export interface AbortRequest {
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promise: Deferred<void>;
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reason?: any;
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wasAlreadyErroring: boolean;
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}
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export interface BufferQueueItem extends Pair<ArrayBuffer | SharedArrayBuffer> {
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offset: number;
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}
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export type CancelAlgorithm = (reason?: any) => PromiseLike<void>;
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export type CloseAlgorithm = () => PromiseLike<void>;
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type Container<R = any> = {
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[sym.queue]: Array<Pair<R> | BufferQueueItem>;
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[sym.queueTotalSize]: number;
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};
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export type FlushAlgorithm = () => Promise<void>;
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export type Pair<R> = { value: R; size: number };
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export type PullAlgorithm = () => PromiseLike<void>;
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export type SizeAlgorithm<T> = (chunk: T) => number;
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export type StartAlgorithm = () => void | PromiseLike<void>;
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export type TransformAlgorithm<I> = (chunk: I) => Promise<void>;
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export type WriteAlgorithm<W> = (chunk: W) => Promise<void>;
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export interface Deferred<T> {
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promise: Promise<T>;
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resolve?: (value?: T | PromiseLike<T>) => void;
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reject?: (reason?: any) => void;
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}
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export interface ReadableStreamGenericReader<R = any>
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extends ReadableStreamReader<R> {
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[sym.closedPromise]: Deferred<void>;
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[sym.forAuthorCode]: boolean;
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[sym.ownerReadableStream]: ReadableStreamImpl<R>;
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[sym.readRequests]: Array<Deferred<ReadableStreamReadResult<R>>>;
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}
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export interface ReadableStreamAsyncIterator<T = any> extends AsyncIterator<T> {
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[sym.asyncIteratorReader]: ReadableStreamDefaultReaderImpl<T>;
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[sym.preventCancel]: boolean;
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return(value?: any | PromiseLike<any>): Promise<IteratorResult<T>>;
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}
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export function acquireReadableStreamDefaultReader<T>(
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stream: ReadableStreamImpl<T>,
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forAuthorCode = false
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): ReadableStreamDefaultReaderImpl<T> {
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const reader = new ReadableStreamDefaultReaderImpl(stream);
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reader[sym.forAuthorCode] = forAuthorCode;
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return reader;
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}
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export function acquireWritableStreamDefaultWriter<W>(
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stream: WritableStreamImpl<W>
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): WritableStreamDefaultWriterImpl<W> {
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return new WritableStreamDefaultWriterImpl(stream);
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}
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export function call<F extends (...args: any[]) => any>(
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fn: F,
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v: ThisType<F>,
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args: Parameters<F>
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): ReturnType<F> {
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return Function.prototype.apply.call(fn, v, args);
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}
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function createAlgorithmFromUnderlyingMethod<
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O extends UnderlyingByteSource | UnderlyingSource | Transformer,
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P extends keyof O
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>(
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underlyingObject: O,
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methodName: P,
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algoArgCount: 0,
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...extraArgs: any[]
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): () => Promise<void>;
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function createAlgorithmFromUnderlyingMethod<
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O extends UnderlyingByteSource | UnderlyingSource | Transformer,
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P extends keyof O
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>(
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underlyingObject: O,
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methodName: P,
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algoArgCount: 1,
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...extraArgs: any[]
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): (arg: any) => Promise<void>;
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function createAlgorithmFromUnderlyingMethod<
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O extends UnderlyingByteSource | UnderlyingSource | Transformer,
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P extends keyof O
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>(
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underlyingObject: O,
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methodName: P,
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algoArgCount: 0 | 1,
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...extraArgs: any[]
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): (() => Promise<void>) | ((arg: any) => Promise<void>) {
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const method = underlyingObject[methodName];
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if (method) {
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if (!isCallable(method)) {
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throw new TypeError("method is not callable");
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}
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if (algoArgCount === 0) {
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return async (): Promise<void> =>
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call(method, underlyingObject, extraArgs as any);
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} else {
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return async (arg: any): Promise<void> => {
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const fullArgs = [arg, ...extraArgs];
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return call(method, underlyingObject, fullArgs as any);
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};
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}
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}
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return async (): Promise<void> => undefined;
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}
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function createReadableStream<T>(
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startAlgorithm: StartAlgorithm,
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pullAlgorithm: PullAlgorithm,
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cancelAlgorithm: CancelAlgorithm,
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highWaterMark = 1,
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sizeAlgorithm: SizeAlgorithm<T> = (): number => 1
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): ReadableStreamImpl<T> {
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highWaterMark = validateAndNormalizeHighWaterMark(highWaterMark);
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const stream: ReadableStreamImpl<T> = Object.create(
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ReadableStreamImpl.prototype
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);
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initializeReadableStream(stream);
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const controller: ReadableStreamDefaultControllerImpl<T> = Object.create(
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ReadableStreamDefaultControllerImpl.prototype
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);
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setUpReadableStreamDefaultController(
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stream,
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controller,
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startAlgorithm,
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pullAlgorithm,
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cancelAlgorithm,
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highWaterMark,
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sizeAlgorithm
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);
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return stream;
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}
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function createWritableStream<W>(
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startAlgorithm: StartAlgorithm,
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writeAlgorithm: WriteAlgorithm<W>,
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closeAlgorithm: CloseAlgorithm,
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abortAlgorithm: AbortAlgorithm,
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highWaterMark = 1,
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sizeAlgorithm: SizeAlgorithm<W> = (): number => 1
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): WritableStreamImpl<W> {
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highWaterMark = validateAndNormalizeHighWaterMark(highWaterMark);
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const stream = Object.create(WritableStreamImpl.prototype);
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initializeWritableStream(stream);
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const controller = Object.create(
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WritableStreamDefaultControllerImpl.prototype
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);
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setUpWritableStreamDefaultController(
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stream,
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controller,
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startAlgorithm,
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writeAlgorithm,
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closeAlgorithm,
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abortAlgorithm,
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highWaterMark,
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sizeAlgorithm
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);
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return stream;
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}
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export function dequeueValue<R>(container: Container<R>): R {
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assert(sym.queue in container && sym.queueTotalSize in container);
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assert(container[sym.queue].length);
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const pair = container[sym.queue].shift()!;
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container[sym.queueTotalSize] -= pair.size;
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if (container[sym.queueTotalSize] <= 0) {
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container[sym.queueTotalSize] = 0;
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}
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return pair.value as R;
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}
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function enqueueValueWithSize<R>(
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container: Container<R>,
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value: R,
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size: number
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): void {
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assert(sym.queue in container && sym.queueTotalSize in container);
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size = Number(size);
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if (!isFiniteNonNegativeNumber(size)) {
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throw new RangeError("size must be a finite non-negative number.");
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}
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container[sym.queue].push({ value, size });
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container[sym.queueTotalSize] += size;
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}
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/** Non-spec mechanism to "unwrap" a promise and store it to be resolved
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* later. */
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export function getDeferred<T>(): Required<Deferred<T>> {
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let resolve: (value?: T | PromiseLike<T>) => void;
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let reject: (reason?: any) => void;
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const promise = new Promise<T>((res, rej) => {
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resolve = res;
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reject = rej;
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});
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return { promise, resolve: resolve!, reject: reject! };
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}
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export function initializeReadableStream<R>(
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stream: ReadableStreamImpl<R>
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): void {
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stream[sym.state] = "readable";
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stream[sym.reader] = stream[sym.storedError] = undefined;
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stream[sym.disturbed] = false;
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}
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export function initializeTransformStream<I, O>(
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stream: TransformStreamImpl<I, O>,
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startPromise: Promise<void>,
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writableHighWaterMark: number,
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writableSizeAlgorithm: SizeAlgorithm<I>,
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readableHighWaterMark: number,
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readableSizeAlgorithm: SizeAlgorithm<O>
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): void {
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const startAlgorithm = (): Promise<void> => startPromise;
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const writeAlgorithm = (chunk: any): Promise<void> =>
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transformStreamDefaultSinkWriteAlgorithm(stream, chunk);
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const abortAlgorithm = (reason: any): Promise<void> =>
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transformStreamDefaultSinkAbortAlgorithm(stream, reason);
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const closeAlgorithm = (): Promise<void> =>
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transformStreamDefaultSinkCloseAlgorithm(stream);
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stream[sym.writable] = createWritableStream(
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startAlgorithm,
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writeAlgorithm,
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closeAlgorithm,
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abortAlgorithm,
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writableHighWaterMark,
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writableSizeAlgorithm
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);
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const pullAlgorithm = (): PromiseLike<void> =>
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transformStreamDefaultSourcePullAlgorithm(stream);
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const cancelAlgorithm = (reason: any): Promise<void> => {
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transformStreamErrorWritableAndUnblockWrite(stream, reason);
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return Promise.resolve(undefined);
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};
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stream[sym.readable] = createReadableStream(
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startAlgorithm,
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pullAlgorithm,
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cancelAlgorithm,
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readableHighWaterMark,
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readableSizeAlgorithm
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);
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stream[sym.backpressure] = stream[sym.backpressureChangePromise] = undefined;
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transformStreamSetBackpressure(stream, true);
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Object.defineProperty(stream, sym.transformStreamController, {
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value: undefined,
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configurable: true,
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});
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}
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export function initializeWritableStream<W>(
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stream: WritableStreamImpl<W>
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): void {
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stream[sym.state] = "writable";
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stream[sym.storedError] = stream[sym.writer] = stream[
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sym.writableStreamController
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] = stream[sym.inFlightWriteRequest] = stream[sym.closeRequest] = stream[
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sym.inFlightCloseRequest
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] = stream[sym.pendingAbortRequest] = undefined;
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stream[sym.writeRequests] = [];
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stream[sym.backpressure] = false;
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}
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export function invokeOrNoop<O extends Record<string, any>, P extends keyof O>(
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o: O,
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p: P,
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...args: Parameters<O[P]>
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): ReturnType<O[P]> | undefined {
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assert(o);
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const method = o[p];
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if (!method) {
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return undefined;
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}
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return call(method, o, args);
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}
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function isCallable(value: unknown): value is (...args: any) => any {
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return typeof value === "function";
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}
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export function isDetachedBuffer(value: object): boolean {
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return sym.isFakeDetached in value;
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}
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function isFiniteNonNegativeNumber(v: unknown): v is number {
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return Number.isFinite(v) && (v as number) >= 0;
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}
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export function isReadableByteStreamController(
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x: unknown
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): x is ReadableByteStreamControllerImpl {
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return !(
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typeof x !== "object" ||
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x === null ||
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!(sym.controlledReadableByteStream in x)
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);
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}
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export function isReadableStream(x: unknown): x is ReadableStreamImpl {
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return !(
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typeof x !== "object" ||
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x === null ||
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!(sym.readableStreamController in x)
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);
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}
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export function isReadableStreamAsyncIterator(
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x: unknown
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): x is ReadableStreamAsyncIterator {
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if (typeof x !== "object" || x === null) {
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return false;
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}
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return sym.asyncIteratorReader in x;
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}
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export function isReadableStreamDefaultController(
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x: unknown
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): x is ReadableStreamDefaultControllerImpl {
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return !(
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typeof x !== "object" ||
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x === null ||
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!(sym.controlledReadableStream in x)
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);
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}
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export function isReadableStreamDefaultReader<T>(
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x: unknown
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): x is ReadableStreamDefaultReaderImpl<T> {
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return !(typeof x !== "object" || x === null || !(sym.readRequests in x));
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}
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export function isReadableStreamLocked(stream: ReadableStreamImpl): boolean {
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assert(isReadableStream(stream));
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return !!stream[sym.reader];
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}
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export function isReadableStreamDisturbed(stream: ReadableStream): boolean {
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assert(isReadableStream(stream));
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return !!stream[sym.disturbed];
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}
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export function isTransformStream(x: unknown): x is TransformStreamImpl {
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return !(
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typeof x !== "object" ||
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x === null ||
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!(sym.transformStreamController in x)
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);
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}
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export function isTransformStreamDefaultController(
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x: unknown
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): x is TransformStreamDefaultControllerImpl {
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return !(
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typeof x !== "object" ||
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x === null ||
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!(sym.controlledTransformStream in x)
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);
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}
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export function isUnderlyingByteSource(
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underlyingSource: UnderlyingByteSource | UnderlyingSource
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): underlyingSource is UnderlyingByteSource {
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const { type } = underlyingSource;
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const typeString = String(type);
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return typeString === "bytes";
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}
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export function isWritableStream(x: unknown): x is WritableStreamImpl {
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return !(
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typeof x !== "object" ||
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x === null ||
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!(sym.writableStreamController in x)
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);
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}
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export function isWritableStreamDefaultController(
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x: unknown
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): x is WritableStreamDefaultControllerImpl<any> {
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return !(
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typeof x !== "object" ||
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x === null ||
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!(sym.controlledWritableStream in x)
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);
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}
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export function isWritableStreamDefaultWriter(
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x: unknown
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): x is WritableStreamDefaultWriterImpl<any> {
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return !(
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typeof x !== "object" ||
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x === null ||
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!(sym.ownerWritableStream in x)
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);
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}
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export function isWritableStreamLocked(stream: WritableStreamImpl): boolean {
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assert(isWritableStream(stream));
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return stream[sym.writer] !== undefined;
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}
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export function makeSizeAlgorithmFromSizeFunction<T>(
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size: QueuingStrategySizeCallback<T> | undefined
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): SizeAlgorithm<T> {
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if (size === undefined) {
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return (): number => 1;
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}
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if (typeof size !== "function") {
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throw new TypeError("size must be callable.");
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}
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return (chunk: T): number => {
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return size.call(undefined, chunk);
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};
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}
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function peekQueueValue<T>(container: Container<T>): T | "close" {
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assert(sym.queue in container && sym.queueTotalSize in container);
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assert(container[sym.queue].length);
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const [pair] = container[sym.queue];
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return pair.value as T;
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}
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function readableByteStreamControllerShouldCallPull(
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controller: ReadableByteStreamControllerImpl
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): boolean {
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const stream = controller[sym.controlledReadableByteStream];
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if (
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stream[sym.state] !== "readable" ||
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controller[sym.closeRequested] ||
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!controller[sym.started]
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) {
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return false;
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}
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if (
|
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readableStreamHasDefaultReader(stream) &&
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readableStreamGetNumReadRequests(stream) > 0
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) {
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return true;
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}
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// 3.13.25.6 If ! ReadableStreamHasBYOBReader(stream) is true and !
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// ReadableStreamGetNumReadIntoRequests(stream) > 0, return true.
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const desiredSize = readableByteStreamControllerGetDesiredSize(controller);
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assert(desiredSize !== null);
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return desiredSize > 0;
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}
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export function readableByteStreamControllerCallPullIfNeeded(
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controller: ReadableByteStreamControllerImpl
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): void {
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const shouldPull = readableByteStreamControllerShouldCallPull(controller);
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if (!shouldPull) {
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return;
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}
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if (controller[sym.pulling]) {
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controller[sym.pullAgain] = true;
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return;
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}
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assert(controller[sym.pullAgain] === false);
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controller[sym.pulling] = true;
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const pullPromise = controller[sym.pullAlgorithm]();
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setPromiseIsHandledToTrue(
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pullPromise.then(
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() => {
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controller[sym.pulling] = false;
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if (controller[sym.pullAgain]) {
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controller[sym.pullAgain] = false;
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readableByteStreamControllerCallPullIfNeeded(controller);
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}
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},
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(e) => {
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readableByteStreamControllerError(controller, e);
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}
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)
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);
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}
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export function readableByteStreamControllerClearAlgorithms(
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controller: ReadableByteStreamControllerImpl
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): void {
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(controller as any)[sym.pullAlgorithm] = undefined;
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(controller as any)[sym.cancelAlgorithm] = undefined;
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}
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export function readableByteStreamControllerClose(
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controller: ReadableByteStreamControllerImpl
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): void {
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const stream = controller[sym.controlledReadableByteStream];
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if (controller[sym.closeRequested] || stream[sym.state] !== "readable") {
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return;
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}
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if (controller[sym.queueTotalSize] > 0) {
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controller[sym.closeRequested] = true;
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return;
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}
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// 3.13.6.4 If controller.[[pendingPullIntos]] is not empty, (BYOB Support)
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readableByteStreamControllerClearAlgorithms(controller);
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readableStreamClose(stream);
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}
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export function readableByteStreamControllerEnqueue(
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controller: ReadableByteStreamControllerImpl,
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chunk: ArrayBufferView
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): void {
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const stream = controller[sym.controlledReadableByteStream];
|
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if (controller[sym.closeRequested] || stream[sym.state] !== "readable") {
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return;
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}
|
|
const { buffer, byteOffset, byteLength } = chunk;
|
|
const transferredBuffer = transferArrayBuffer(buffer);
|
|
if (readableStreamHasDefaultReader(stream)) {
|
|
if (readableStreamGetNumReadRequests(stream) === 0) {
|
|
readableByteStreamControllerEnqueueChunkToQueue(
|
|
controller,
|
|
transferredBuffer,
|
|
byteOffset,
|
|
byteLength
|
|
);
|
|
} else {
|
|
assert(controller[sym.queue].length === 0);
|
|
const transferredView = new Uint8Array(
|
|
transferredBuffer,
|
|
byteOffset,
|
|
byteLength
|
|
);
|
|
readableStreamFulfillReadRequest(stream, transferredView, false);
|
|
}
|
|
// 3.13.9.8 Otherwise, if ! ReadableStreamHasBYOBReader(stream) is true
|
|
} else {
|
|
assert(!isReadableStreamLocked(stream));
|
|
readableByteStreamControllerEnqueueChunkToQueue(
|
|
controller,
|
|
transferredBuffer,
|
|
byteOffset,
|
|
byteLength
|
|
);
|
|
}
|
|
readableByteStreamControllerCallPullIfNeeded(controller);
|
|
}
|
|
|
|
function readableByteStreamControllerEnqueueChunkToQueue(
|
|
controller: ReadableByteStreamControllerImpl,
|
|
buffer: ArrayBuffer | SharedArrayBuffer,
|
|
byteOffset: number,
|
|
byteLength: number
|
|
): void {
|
|
controller[sym.queue].push({
|
|
value: buffer,
|
|
offset: byteOffset,
|
|
size: byteLength,
|
|
});
|
|
controller[sym.queueTotalSize] += byteLength;
|
|
}
|
|
|
|
export function readableByteStreamControllerError(
|
|
controller: ReadableByteStreamControllerImpl,
|
|
e: any
|
|
): void {
|
|
const stream = controller[sym.controlledReadableByteStream];
|
|
if (stream[sym.state] !== "readable") {
|
|
return;
|
|
}
|
|
// 3.13.11.3 Perform ! ReadableByteStreamControllerClearPendingPullIntos(controller).
|
|
resetQueue(controller);
|
|
readableByteStreamControllerClearAlgorithms(controller);
|
|
readableStreamError(stream, e);
|
|
}
|
|
|
|
export function readableByteStreamControllerGetDesiredSize(
|
|
controller: ReadableByteStreamControllerImpl
|
|
): number | null {
|
|
const stream = controller[sym.controlledReadableByteStream];
|
|
const state = stream[sym.state];
|
|
if (state === "errored") {
|
|
return null;
|
|
}
|
|
if (state === "closed") {
|
|
return 0;
|
|
}
|
|
return controller[sym.strategyHWM] - controller[sym.queueTotalSize];
|
|
}
|
|
|
|
export function readableByteStreamControllerHandleQueueDrain(
|
|
controller: ReadableByteStreamControllerImpl
|
|
): void {
|
|
assert(
|
|
controller[sym.controlledReadableByteStream][sym.state] === "readable"
|
|
);
|
|
if (controller[sym.queueTotalSize] === 0 && controller[sym.closeRequested]) {
|
|
readableByteStreamControllerClearAlgorithms(controller);
|
|
readableStreamClose(controller[sym.controlledReadableByteStream]);
|
|
} else {
|
|
readableByteStreamControllerCallPullIfNeeded(controller);
|
|
}
|
|
}
|
|
|
|
export function readableStreamAddReadRequest<R>(
|
|
stream: ReadableStreamImpl<R>
|
|
): Promise<ReadableStreamReadResult<R>> {
|
|
assert(isReadableStreamDefaultReader(stream[sym.reader]));
|
|
assert(stream[sym.state] === "readable");
|
|
const promise = getDeferred<ReadableStreamReadResult<R>>();
|
|
stream[sym.reader]![sym.readRequests].push(promise);
|
|
return promise.promise;
|
|
}
|
|
|
|
export function readableStreamCancel<T>(
|
|
stream: ReadableStreamImpl<T>,
|
|
reason: any
|
|
): Promise<void> {
|
|
stream[sym.disturbed] = true;
|
|
if (stream[sym.state] === "closed") {
|
|
return Promise.resolve();
|
|
}
|
|
if (stream[sym.state] === "errored") {
|
|
return Promise.reject(stream[sym.storedError]);
|
|
}
|
|
readableStreamClose(stream);
|
|
return stream[sym.readableStreamController].then(
|
|
() => undefined
|
|
) as Promise<void>;
|
|
}
|
|
|
|
export function readableStreamClose<T>(stream: ReadableStreamImpl<T>): void {
|
|
assert(stream[sym.state] === "readable");
|
|
stream[sym.state] = "closed";
|
|
const reader = stream[sym.reader];
|
|
if (!reader) {
|
|
return;
|
|
}
|
|
if (isReadableStreamDefaultReader<T>(reader)) {
|
|
for (const readRequest of reader[sym.readRequests]) {
|
|
assert(readRequest.resolve);
|
|
readRequest.resolve(
|
|
readableStreamCreateReadResult<T>(
|
|
undefined,
|
|
true,
|
|
reader[sym.forAuthorCode]
|
|
)
|
|
);
|
|
}
|
|
reader[sym.readRequests] = [];
|
|
}
|
|
const resolve = reader[sym.closedPromise].resolve;
|
|
assert(resolve);
|
|
resolve();
|
|
}
|
|
|
|
export function readableStreamCreateReadResult<T>(
|
|
value: T | undefined,
|
|
done: boolean,
|
|
forAuthorCode: boolean
|
|
): ReadableStreamReadResult<T> {
|
|
const prototype = forAuthorCode ? Object.prototype : null;
|
|
assert(typeof done === "boolean");
|
|
const obj: ReadableStreamReadResult<T> = Object.create(prototype);
|
|
Object.defineProperties(obj, {
|
|
value: { value, writable: true, enumerable: true, configurable: true },
|
|
done: { value: done, writable: true, enumerable: true, configurable: true },
|
|
});
|
|
return obj;
|
|
}
|
|
|
|
export function readableStreamDefaultControllerCallPullIfNeeded<T>(
|
|
controller: ReadableStreamDefaultControllerImpl<T>
|
|
): void {
|
|
const shouldPull = readableStreamDefaultControllerShouldCallPull(controller);
|
|
if (!shouldPull) {
|
|
return;
|
|
}
|
|
if (controller[sym.pulling]) {
|
|
controller[sym.pullAgain] = true;
|
|
return;
|
|
}
|
|
assert(controller[sym.pullAgain] === false);
|
|
controller[sym.pulling] = true;
|
|
const pullPromise = controller[sym.pullAlgorithm]();
|
|
pullPromise.then(
|
|
() => {
|
|
controller[sym.pulling] = false;
|
|
if (controller[sym.pullAgain]) {
|
|
controller[sym.pullAgain] = false;
|
|
readableStreamDefaultControllerCallPullIfNeeded(controller);
|
|
}
|
|
},
|
|
(e) => {
|
|
readableStreamDefaultControllerError(controller, e);
|
|
}
|
|
);
|
|
}
|
|
|
|
export function readableStreamDefaultControllerCanCloseOrEnqueue<T>(
|
|
controller: ReadableStreamDefaultControllerImpl<T>
|
|
): boolean {
|
|
const state = controller[sym.controlledReadableStream][sym.state];
|
|
return !controller[sym.closeRequested] && state === "readable";
|
|
}
|
|
|
|
export function readableStreamDefaultControllerClearAlgorithms<T>(
|
|
controller: ReadableStreamDefaultControllerImpl<T>
|
|
): void {
|
|
(controller as any)[sym.pullAlgorithm] = undefined;
|
|
(controller as any)[sym.cancelAlgorithm] = undefined;
|
|
(controller as any)[sym.strategySizeAlgorithm] = undefined;
|
|
}
|
|
|
|
export function readableStreamDefaultControllerClose<T>(
|
|
controller: ReadableStreamDefaultControllerImpl<T>
|
|
): void {
|
|
if (!readableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
|
|
return;
|
|
}
|
|
const stream = controller[sym.controlledReadableStream];
|
|
controller[sym.closeRequested] = true;
|
|
if (controller[sym.queue].length === 0) {
|
|
readableStreamDefaultControllerClearAlgorithms(controller);
|
|
readableStreamClose(stream);
|
|
}
|
|
}
|
|
|
|
export function readableStreamDefaultControllerEnqueue<T>(
|
|
controller: ReadableStreamDefaultControllerImpl<T>,
|
|
chunk: T
|
|
): void {
|
|
if (!readableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
|
|
return;
|
|
}
|
|
const stream = controller[sym.controlledReadableStream];
|
|
if (
|
|
isReadableStreamLocked(stream) &&
|
|
readableStreamGetNumReadRequests(stream) > 0
|
|
) {
|
|
readableStreamFulfillReadRequest(stream, chunk, false);
|
|
} else {
|
|
try {
|
|
const chunkSize = controller[sym.strategySizeAlgorithm](chunk);
|
|
enqueueValueWithSize(controller, chunk, chunkSize);
|
|
} catch (err) {
|
|
readableStreamDefaultControllerError(controller, err);
|
|
throw err;
|
|
}
|
|
}
|
|
readableStreamDefaultControllerCallPullIfNeeded(controller);
|
|
}
|
|
|
|
export function readableStreamDefaultControllerGetDesiredSize<T>(
|
|
controller: ReadableStreamDefaultControllerImpl<T>
|
|
): number | null {
|
|
const stream = controller[sym.controlledReadableStream];
|
|
const state = stream[sym.state];
|
|
if (state === "errored") {
|
|
return null;
|
|
}
|
|
if (state === "closed") {
|
|
return 0;
|
|
}
|
|
return controller[sym.strategyHWM] - controller[sym.queueTotalSize];
|
|
}
|
|
|
|
export function readableStreamDefaultControllerError<T>(
|
|
controller: ReadableStreamDefaultControllerImpl<T>,
|
|
e: any
|
|
): void {
|
|
const stream = controller[sym.controlledReadableStream];
|
|
if (stream[sym.state] !== "readable") {
|
|
return;
|
|
}
|
|
resetQueue(controller);
|
|
readableStreamDefaultControllerClearAlgorithms(controller);
|
|
readableStreamError(stream, e);
|
|
}
|
|
|
|
function readableStreamDefaultControllerHasBackpressure<T>(
|
|
controller: ReadableStreamDefaultControllerImpl<T>
|
|
): boolean {
|
|
return readableStreamDefaultControllerShouldCallPull(controller);
|
|
}
|
|
|
|
function readableStreamDefaultControllerShouldCallPull<T>(
|
|
controller: ReadableStreamDefaultControllerImpl<T>
|
|
): boolean {
|
|
const stream = controller[sym.controlledReadableStream];
|
|
if (
|
|
!readableStreamDefaultControllerCanCloseOrEnqueue(controller) ||
|
|
controller[sym.started] === false
|
|
) {
|
|
return false;
|
|
}
|
|
if (
|
|
isReadableStreamLocked(stream) &&
|
|
readableStreamGetNumReadRequests(stream) > 0
|
|
) {
|
|
return true;
|
|
}
|
|
const desiredSize = readableStreamDefaultControllerGetDesiredSize(controller);
|
|
assert(desiredSize !== null);
|
|
return desiredSize > 0;
|
|
}
|
|
|
|
export function readableStreamDefaultReaderRead<R>(
|
|
reader: ReadableStreamDefaultReaderImpl<R>
|
|
): Promise<ReadableStreamReadResult<R>> {
|
|
const stream = reader[sym.ownerReadableStream];
|
|
assert(stream);
|
|
stream[sym.disturbed] = true;
|
|
if (stream[sym.state] === "closed") {
|
|
return Promise.resolve(
|
|
readableStreamCreateReadResult<R>(
|
|
undefined,
|
|
true,
|
|
reader[sym.forAuthorCode]
|
|
)
|
|
);
|
|
}
|
|
if (stream[sym.state] === "errored") {
|
|
return Promise.reject(stream[sym.storedError]);
|
|
}
|
|
assert(stream[sym.state] === "readable");
|
|
return (stream[
|
|
sym.readableStreamController
|
|
] as ReadableStreamDefaultControllerImpl)[sym.pullSteps]();
|
|
}
|
|
|
|
export function readableStreamError(stream: ReadableStreamImpl, e: any): void {
|
|
assert(isReadableStream(stream));
|
|
assert(stream[sym.state] === "readable");
|
|
stream[sym.state] = "errored";
|
|
stream[sym.storedError] = e;
|
|
const reader = stream[sym.reader];
|
|
if (reader === undefined) {
|
|
return;
|
|
}
|
|
if (isReadableStreamDefaultReader(reader)) {
|
|
for (const readRequest of reader[sym.readRequests]) {
|
|
assert(readRequest.reject);
|
|
readRequest.reject(e);
|
|
readRequest.reject = undefined;
|
|
readRequest.resolve = undefined;
|
|
}
|
|
reader[sym.readRequests] = [];
|
|
}
|
|
// 3.5.6.8 Otherwise, support BYOB Reader
|
|
reader[sym.closedPromise].reject!(e);
|
|
reader[sym.closedPromise].reject = undefined;
|
|
reader[sym.closedPromise].resolve = undefined;
|
|
setPromiseIsHandledToTrue(reader[sym.closedPromise].promise);
|
|
}
|
|
|
|
export function readableStreamFulfillReadRequest<R>(
|
|
stream: ReadableStreamImpl<R>,
|
|
chunk: R,
|
|
done: boolean
|
|
): void {
|
|
const reader = stream[sym.reader]!;
|
|
const readRequest = reader[sym.readRequests].shift()!;
|
|
assert(readRequest.resolve);
|
|
readRequest.resolve(
|
|
readableStreamCreateReadResult(chunk, done, reader[sym.forAuthorCode])
|
|
);
|
|
}
|
|
|
|
export function readableStreamGetNumReadRequests(
|
|
stream: ReadableStreamImpl
|
|
): number {
|
|
return stream[sym.reader]?.[sym.readRequests].length ?? 0;
|
|
}
|
|
|
|
export function readableStreamHasDefaultReader(
|
|
stream: ReadableStreamImpl
|
|
): boolean {
|
|
const reader = stream[sym.reader];
|
|
return !(reader === undefined || !isReadableStreamDefaultReader(reader));
|
|
}
|
|
|
|
export function readableStreamPipeTo<T>(
|
|
source: ReadableStreamImpl<T>,
|
|
dest: WritableStreamImpl<T>,
|
|
preventClose: boolean,
|
|
preventAbort: boolean,
|
|
preventCancel: boolean,
|
|
signal: AbortSignalImpl | undefined
|
|
): Promise<void> {
|
|
assert(isReadableStream(source));
|
|
assert(isWritableStream(dest));
|
|
assert(
|
|
typeof preventClose === "boolean" &&
|
|
typeof preventAbort === "boolean" &&
|
|
typeof preventCancel === "boolean"
|
|
);
|
|
assert(signal === undefined || signal instanceof AbortSignalImpl);
|
|
assert(!isReadableStreamLocked(source));
|
|
assert(!isWritableStreamLocked(dest));
|
|
const reader = acquireReadableStreamDefaultReader(source);
|
|
const writer = acquireWritableStreamDefaultWriter(dest);
|
|
source[sym.disturbed] = true;
|
|
let shuttingDown = false;
|
|
const promise = getDeferred<void>();
|
|
let abortAlgorithm: () => void;
|
|
if (signal) {
|
|
abortAlgorithm = (): void => {
|
|
const error = new DOMException("Abort signal received.", "AbortSignal");
|
|
const actions: Array<() => Promise<void>> = [];
|
|
if (!preventAbort) {
|
|
actions.push(() => {
|
|
if (dest[sym.state] === "writable") {
|
|
return writableStreamAbort(dest, error);
|
|
} else {
|
|
return Promise.resolve(undefined);
|
|
}
|
|
});
|
|
}
|
|
if (!preventCancel) {
|
|
actions.push(() => {
|
|
if (source[sym.state] === "readable") {
|
|
return readableStreamCancel(source, error);
|
|
} else {
|
|
return Promise.resolve(undefined);
|
|
}
|
|
});
|
|
}
|
|
shutdownWithAction(
|
|
() => Promise.all(actions.map((action) => action())),
|
|
true,
|
|
error
|
|
);
|
|
};
|
|
if (signal.aborted) {
|
|
abortAlgorithm();
|
|
return promise.promise;
|
|
}
|
|
signal.addEventListener("abort", abortAlgorithm);
|
|
}
|
|
|
|
let currentWrite = Promise.resolve();
|
|
|
|
// At this point, the spec becomes non-specific and vague. Most of the rest
|
|
// of this code is based on the reference implementation that is part of the
|
|
// specification. This is why the functions are only scoped to this function
|
|
// to ensure they don't leak into the spec compliant parts.
|
|
|
|
function isOrBecomesClosed(
|
|
stream: ReadableStreamImpl | WritableStreamImpl,
|
|
promise: Promise<void>,
|
|
action: () => void
|
|
): void {
|
|
if (stream[sym.state] === "closed") {
|
|
action();
|
|
} else {
|
|
setPromiseIsHandledToTrue(promise.then(action));
|
|
}
|
|
}
|
|
|
|
function isOrBecomesErrored(
|
|
stream: ReadableStreamImpl | WritableStreamImpl,
|
|
promise: Promise<void>,
|
|
action: (error: any) => void
|
|
): void {
|
|
if (stream[sym.state] === "errored") {
|
|
action(stream[sym.storedError]);
|
|
} else {
|
|
setPromiseIsHandledToTrue(promise.catch((error) => action(error)));
|
|
}
|
|
}
|
|
|
|
function finalize(isError?: boolean, error?: any): void {
|
|
writableStreamDefaultWriterRelease(writer);
|
|
readableStreamReaderGenericRelease(reader);
|
|
|
|
if (signal) {
|
|
signal.removeEventListener("abort", abortAlgorithm);
|
|
}
|
|
if (isError) {
|
|
promise.reject(error);
|
|
} else {
|
|
promise.resolve();
|
|
}
|
|
}
|
|
|
|
function waitForWritesToFinish(): Promise<void> {
|
|
const oldCurrentWrite = currentWrite;
|
|
return currentWrite.then(() =>
|
|
oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined
|
|
);
|
|
}
|
|
|
|
function shutdownWithAction(
|
|
action: () => Promise<any>,
|
|
originalIsError?: boolean,
|
|
originalError?: any
|
|
): void {
|
|
function doTheRest(): void {
|
|
setPromiseIsHandledToTrue(
|
|
action().then(
|
|
() => finalize(originalIsError, originalError),
|
|
(newError) => finalize(true, newError)
|
|
)
|
|
);
|
|
}
|
|
|
|
if (shuttingDown) {
|
|
return;
|
|
}
|
|
shuttingDown = true;
|
|
|
|
if (
|
|
dest[sym.state] === "writable" &&
|
|
writableStreamCloseQueuedOrInFlight(dest) === false
|
|
) {
|
|
setPromiseIsHandledToTrue(waitForWritesToFinish().then(doTheRest));
|
|
} else {
|
|
doTheRest();
|
|
}
|
|
}
|
|
|
|
function shutdown(isError: boolean, error?: any): void {
|
|
if (shuttingDown) {
|
|
return;
|
|
}
|
|
shuttingDown = true;
|
|
|
|
if (
|
|
dest[sym.state] === "writable" &&
|
|
!writableStreamCloseQueuedOrInFlight(dest)
|
|
) {
|
|
setPromiseIsHandledToTrue(
|
|
waitForWritesToFinish().then(() => finalize(isError, error))
|
|
);
|
|
}
|
|
finalize(isError, error);
|
|
}
|
|
|
|
function pipeStep(): Promise<boolean> {
|
|
if (shuttingDown) {
|
|
return Promise.resolve(true);
|
|
}
|
|
return writer[sym.readyPromise].promise.then(() => {
|
|
return readableStreamDefaultReaderRead(reader).then(({ value, done }) => {
|
|
if (done === true) {
|
|
return true;
|
|
}
|
|
currentWrite = writableStreamDefaultWriterWrite(
|
|
writer,
|
|
value!
|
|
).then(undefined, () => {});
|
|
return false;
|
|
});
|
|
});
|
|
}
|
|
|
|
function pipeLoop(): Promise<void> {
|
|
return new Promise((resolveLoop, rejectLoop) => {
|
|
function next(done: boolean): void {
|
|
if (done) {
|
|
resolveLoop(undefined);
|
|
} else {
|
|
setPromiseIsHandledToTrue(pipeStep().then(next, rejectLoop));
|
|
}
|
|
}
|
|
next(false);
|
|
});
|
|
}
|
|
|
|
isOrBecomesErrored(
|
|
source,
|
|
reader[sym.closedPromise].promise,
|
|
(storedError) => {
|
|
if (!preventAbort) {
|
|
shutdownWithAction(
|
|
() => writableStreamAbort(dest, storedError),
|
|
true,
|
|
storedError
|
|
);
|
|
} else {
|
|
shutdown(true, storedError);
|
|
}
|
|
}
|
|
);
|
|
|
|
isOrBecomesErrored(dest, writer[sym.closedPromise].promise, (storedError) => {
|
|
if (!preventCancel) {
|
|
shutdownWithAction(
|
|
() => readableStreamCancel(source, storedError),
|
|
true,
|
|
storedError
|
|
);
|
|
} else {
|
|
shutdown(true, storedError);
|
|
}
|
|
});
|
|
|
|
isOrBecomesClosed(source, reader[sym.closedPromise].promise, () => {
|
|
if (!preventClose) {
|
|
shutdownWithAction(() =>
|
|
writableStreamDefaultWriterCloseWithErrorPropagation(writer)
|
|
);
|
|
}
|
|
});
|
|
|
|
if (
|
|
writableStreamCloseQueuedOrInFlight(dest) ||
|
|
dest[sym.state] === "closed"
|
|
) {
|
|
const destClosed = new TypeError(
|
|
"The destination writable stream closed before all data could be piped to it."
|
|
);
|
|
if (!preventCancel) {
|
|
shutdownWithAction(
|
|
() => readableStreamCancel(source, destClosed),
|
|
true,
|
|
destClosed
|
|
);
|
|
} else {
|
|
shutdown(true, destClosed);
|
|
}
|
|
}
|
|
|
|
setPromiseIsHandledToTrue(pipeLoop());
|
|
return promise.promise;
|
|
}
|
|
|
|
export function readableStreamReaderGenericCancel<R = any>(
|
|
reader: ReadableStreamGenericReader<R>,
|
|
reason: any
|
|
): Promise<void> {
|
|
const stream = reader[sym.ownerReadableStream];
|
|
assert(stream);
|
|
return readableStreamCancel(stream, reason);
|
|
}
|
|
|
|
export function readableStreamReaderGenericInitialize<R = any>(
|
|
reader: ReadableStreamGenericReader<R>,
|
|
stream: ReadableStreamImpl<R>
|
|
): void {
|
|
reader[sym.forAuthorCode] = true;
|
|
reader[sym.ownerReadableStream] = stream;
|
|
stream[sym.reader] = reader;
|
|
if (stream[sym.state] === "readable") {
|
|
reader[sym.closedPromise] = getDeferred();
|
|
} else if (stream[sym.state] === "closed") {
|
|
reader[sym.closedPromise] = { promise: Promise.resolve() };
|
|
} else {
|
|
assert(stream[sym.state] === "errored");
|
|
reader[sym.closedPromise] = {
|
|
promise: Promise.reject(stream[sym.storedError]),
|
|
};
|
|
setPromiseIsHandledToTrue(reader[sym.closedPromise].promise);
|
|
}
|
|
}
|
|
|
|
export function readableStreamReaderGenericRelease<R = any>(
|
|
reader: ReadableStreamGenericReader<R>
|
|
): void {
|
|
assert(reader[sym.ownerReadableStream]);
|
|
assert(reader[sym.ownerReadableStream][sym.reader] === reader);
|
|
const closedPromise = reader[sym.closedPromise];
|
|
if (reader[sym.ownerReadableStream][sym.state] === "readable") {
|
|
assert(closedPromise.reject);
|
|
closedPromise.reject(new TypeError("ReadableStream state is readable."));
|
|
} else {
|
|
closedPromise.promise = Promise.reject(new TypeError("Reading is closed."));
|
|
delete closedPromise.reject;
|
|
delete closedPromise.resolve;
|
|
}
|
|
setPromiseIsHandledToTrue(closedPromise.promise);
|
|
reader[sym.ownerReadableStream][sym.reader] = undefined;
|
|
(reader as any)[sym.ownerReadableStream] = undefined;
|
|
}
|
|
|
|
export function readableStreamTee<T>(
|
|
stream: ReadableStreamImpl<T>,
|
|
cloneForBranch2: boolean
|
|
): [ReadableStreamImpl<T>, ReadableStreamImpl<T>] {
|
|
assert(isReadableStream(stream));
|
|
assert(typeof cloneForBranch2 === "boolean");
|
|
const reader = acquireReadableStreamDefaultReader(stream);
|
|
let reading = false;
|
|
let canceled1 = false;
|
|
let canceled2 = false;
|
|
let reason1: any = undefined;
|
|
let reason2: any = undefined;
|
|
/* eslint-disable prefer-const */
|
|
let branch1: ReadableStreamImpl<T>;
|
|
let branch2: ReadableStreamImpl<T>;
|
|
/* eslint-enable prefer-const */
|
|
const cancelPromise = getDeferred<void>();
|
|
const pullAlgorithm = (): PromiseLike<void> => {
|
|
if (reading) {
|
|
return Promise.resolve();
|
|
}
|
|
reading = true;
|
|
const readPromise = readableStreamDefaultReaderRead(reader).then(
|
|
(result) => {
|
|
reading = false;
|
|
assert(typeof result === "object");
|
|
const { done } = result;
|
|
assert(typeof done === "boolean");
|
|
if (done) {
|
|
if (!canceled1) {
|
|
readableStreamDefaultControllerClose(
|
|
branch1[
|
|
sym.readableStreamController
|
|
] as ReadableStreamDefaultControllerImpl
|
|
);
|
|
}
|
|
if (!canceled2) {
|
|
readableStreamDefaultControllerClose(
|
|
branch2[
|
|
sym.readableStreamController
|
|
] as ReadableStreamDefaultControllerImpl
|
|
);
|
|
}
|
|
return;
|
|
}
|
|
const { value } = result;
|
|
const value1 = value!;
|
|
let value2 = value!;
|
|
if (!canceled2 && cloneForBranch2) {
|
|
value2 = cloneValue(value2);
|
|
}
|
|
if (!canceled1) {
|
|
readableStreamDefaultControllerEnqueue(
|
|
branch1[
|
|
sym.readableStreamController
|
|
] as ReadableStreamDefaultControllerImpl,
|
|
value1
|
|
);
|
|
}
|
|
if (!canceled2) {
|
|
readableStreamDefaultControllerEnqueue(
|
|
branch2[
|
|
sym.readableStreamController
|
|
] as ReadableStreamDefaultControllerImpl,
|
|
value2
|
|
);
|
|
}
|
|
}
|
|
);
|
|
setPromiseIsHandledToTrue(readPromise);
|
|
return Promise.resolve();
|
|
};
|
|
const cancel1Algorithm = (reason?: any): PromiseLike<void> => {
|
|
canceled1 = true;
|
|
reason1 = reason;
|
|
if (canceled2) {
|
|
const compositeReason = [reason1, reason2];
|
|
const cancelResult = readableStreamCancel(stream, compositeReason);
|
|
cancelPromise.resolve(cancelResult);
|
|
}
|
|
return cancelPromise.promise;
|
|
};
|
|
const cancel2Algorithm = (reason?: any): PromiseLike<void> => {
|
|
canceled2 = true;
|
|
reason2 = reason;
|
|
if (canceled1) {
|
|
const compositeReason = [reason1, reason2];
|
|
const cancelResult = readableStreamCancel(stream, compositeReason);
|
|
cancelPromise.resolve(cancelResult);
|
|
}
|
|
return cancelPromise.promise;
|
|
};
|
|
const startAlgorithm = (): void => undefined;
|
|
branch1 = createReadableStream(
|
|
startAlgorithm,
|
|
pullAlgorithm,
|
|
cancel1Algorithm
|
|
);
|
|
branch2 = createReadableStream(
|
|
startAlgorithm,
|
|
pullAlgorithm,
|
|
cancel2Algorithm
|
|
);
|
|
setPromiseIsHandledToTrue(
|
|
reader[sym.closedPromise].promise.catch((r) => {
|
|
readableStreamDefaultControllerError(
|
|
branch1[
|
|
sym.readableStreamController
|
|
] as ReadableStreamDefaultControllerImpl,
|
|
r
|
|
);
|
|
readableStreamDefaultControllerError(
|
|
branch2[
|
|
sym.readableStreamController
|
|
] as ReadableStreamDefaultControllerImpl,
|
|
r
|
|
);
|
|
})
|
|
);
|
|
return [branch1, branch2];
|
|
}
|
|
|
|
export function resetQueue<R>(container: Container<R>): void {
|
|
assert(sym.queue in container && sym.queueTotalSize in container);
|
|
container[sym.queue] = [];
|
|
container[sym.queueTotalSize] = 0;
|
|
}
|
|
|
|
/** An internal function which mimics the behavior of setting the promise to
|
|
* handled in JavaScript. In this situation, an assertion failure, which
|
|
* shouldn't happen will get thrown, instead of swallowed. */
|
|
export function setPromiseIsHandledToTrue(promise: PromiseLike<unknown>): void {
|
|
promise.then(undefined, (e) => {
|
|
if (e && e instanceof AssertionError) {
|
|
queueMicrotask(() => {
|
|
throw e;
|
|
});
|
|
}
|
|
});
|
|
}
|
|
|
|
function setUpReadableByteStreamController(
|
|
stream: ReadableStreamImpl,
|
|
controller: ReadableByteStreamControllerImpl,
|
|
startAlgorithm: StartAlgorithm,
|
|
pullAlgorithm: PullAlgorithm,
|
|
cancelAlgorithm: CancelAlgorithm,
|
|
highWaterMark: number,
|
|
autoAllocateChunkSize: number | undefined
|
|
): void {
|
|
assert(stream[sym.readableStreamController] === undefined);
|
|
if (autoAllocateChunkSize !== undefined) {
|
|
assert(Number.isInteger(autoAllocateChunkSize));
|
|
assert(autoAllocateChunkSize >= 0);
|
|
}
|
|
controller[sym.controlledReadableByteStream] = stream;
|
|
controller[sym.pulling] = controller[sym.pullAgain] = false;
|
|
controller[sym.byobRequest] = undefined;
|
|
controller[sym.queue] = [];
|
|
controller[sym.queueTotalSize] = 0;
|
|
controller[sym.closeRequested] = controller[sym.started] = false;
|
|
controller[sym.strategyHWM] = validateAndNormalizeHighWaterMark(
|
|
highWaterMark
|
|
);
|
|
controller[sym.pullAlgorithm] = pullAlgorithm;
|
|
controller[sym.cancelAlgorithm] = cancelAlgorithm;
|
|
controller[sym.autoAllocateChunkSize] = autoAllocateChunkSize;
|
|
// 3.13.26.12 Set controller.[[pendingPullIntos]] to a new empty List.
|
|
stream[sym.readableStreamController] = controller;
|
|
const startResult = startAlgorithm();
|
|
const startPromise = Promise.resolve(startResult);
|
|
setPromiseIsHandledToTrue(
|
|
startPromise.then(
|
|
() => {
|
|
controller[sym.started] = true;
|
|
assert(!controller[sym.pulling]);
|
|
assert(!controller[sym.pullAgain]);
|
|
readableByteStreamControllerCallPullIfNeeded(controller);
|
|
},
|
|
(r) => {
|
|
readableByteStreamControllerError(controller, r);
|
|
}
|
|
)
|
|
);
|
|
}
|
|
|
|
export function setUpReadableByteStreamControllerFromUnderlyingSource(
|
|
stream: ReadableStreamImpl,
|
|
underlyingByteSource: UnderlyingByteSource,
|
|
highWaterMark: number
|
|
): void {
|
|
assert(underlyingByteSource);
|
|
const controller: ReadableByteStreamControllerImpl = Object.create(
|
|
ReadableByteStreamControllerImpl.prototype
|
|
);
|
|
const startAlgorithm: StartAlgorithm = () => {
|
|
return invokeOrNoop(underlyingByteSource, "start", controller);
|
|
};
|
|
const pullAlgorithm = createAlgorithmFromUnderlyingMethod(
|
|
underlyingByteSource,
|
|
"pull",
|
|
0,
|
|
controller
|
|
);
|
|
setFunctionName(pullAlgorithm, "[[pullAlgorithm]]");
|
|
const cancelAlgorithm = createAlgorithmFromUnderlyingMethod(
|
|
underlyingByteSource,
|
|
"cancel",
|
|
1
|
|
);
|
|
setFunctionName(cancelAlgorithm, "[[cancelAlgorithm]]");
|
|
// 3.13.27.6 Let autoAllocateChunkSize be ? GetV(underlyingByteSource, "autoAllocateChunkSize").
|
|
const autoAllocateChunkSize = undefined;
|
|
setUpReadableByteStreamController(
|
|
stream,
|
|
controller,
|
|
startAlgorithm,
|
|
pullAlgorithm,
|
|
cancelAlgorithm,
|
|
highWaterMark,
|
|
autoAllocateChunkSize
|
|
);
|
|
}
|
|
|
|
function setUpReadableStreamDefaultController<T>(
|
|
stream: ReadableStreamImpl<T>,
|
|
controller: ReadableStreamDefaultControllerImpl<T>,
|
|
startAlgorithm: StartAlgorithm,
|
|
pullAlgorithm: PullAlgorithm,
|
|
cancelAlgorithm: CancelAlgorithm,
|
|
highWaterMark: number,
|
|
sizeAlgorithm: SizeAlgorithm<T>
|
|
): void {
|
|
assert(stream[sym.readableStreamController] === undefined);
|
|
controller[sym.controlledReadableStream] = stream;
|
|
controller[sym.queue] = [];
|
|
controller[sym.queueTotalSize] = 0;
|
|
controller[sym.started] = controller[sym.closeRequested] = controller[
|
|
sym.pullAgain
|
|
] = controller[sym.pulling] = false;
|
|
controller[sym.strategySizeAlgorithm] = sizeAlgorithm;
|
|
controller[sym.strategyHWM] = highWaterMark;
|
|
controller[sym.pullAlgorithm] = pullAlgorithm;
|
|
controller[sym.cancelAlgorithm] = cancelAlgorithm;
|
|
stream[sym.readableStreamController] = controller;
|
|
const startResult = startAlgorithm();
|
|
const startPromise = Promise.resolve(startResult);
|
|
setPromiseIsHandledToTrue(
|
|
startPromise.then(
|
|
() => {
|
|
controller[sym.started] = true;
|
|
assert(controller[sym.pulling] === false);
|
|
assert(controller[sym.pullAgain] === false);
|
|
readableStreamDefaultControllerCallPullIfNeeded(controller);
|
|
},
|
|
(r) => {
|
|
readableStreamDefaultControllerError(controller, r);
|
|
}
|
|
)
|
|
);
|
|
}
|
|
|
|
export function setUpReadableStreamDefaultControllerFromUnderlyingSource<T>(
|
|
stream: ReadableStreamImpl<T>,
|
|
underlyingSource: UnderlyingSource<T>,
|
|
highWaterMark: number,
|
|
sizeAlgorithm: SizeAlgorithm<T>
|
|
): void {
|
|
assert(underlyingSource);
|
|
const controller: ReadableStreamDefaultControllerImpl<T> = Object.create(
|
|
ReadableStreamDefaultControllerImpl.prototype
|
|
);
|
|
const startAlgorithm: StartAlgorithm = (): void | PromiseLike<void> =>
|
|
invokeOrNoop(underlyingSource, "start", controller);
|
|
const pullAlgorithm: PullAlgorithm = createAlgorithmFromUnderlyingMethod(
|
|
underlyingSource,
|
|
"pull",
|
|
0,
|
|
controller
|
|
);
|
|
setFunctionName(pullAlgorithm, "[[pullAlgorithm]]");
|
|
const cancelAlgorithm: CancelAlgorithm = createAlgorithmFromUnderlyingMethod(
|
|
underlyingSource,
|
|
"cancel",
|
|
1
|
|
);
|
|
setFunctionName(cancelAlgorithm, "[[cancelAlgorithm]]");
|
|
setUpReadableStreamDefaultController(
|
|
stream,
|
|
controller,
|
|
startAlgorithm,
|
|
pullAlgorithm,
|
|
cancelAlgorithm,
|
|
highWaterMark,
|
|
sizeAlgorithm
|
|
);
|
|
}
|
|
|
|
function setUpTransformStreamDefaultController<I, O>(
|
|
stream: TransformStreamImpl<I, O>,
|
|
controller: TransformStreamDefaultControllerImpl<I, O>,
|
|
transformAlgorithm: TransformAlgorithm<I>,
|
|
flushAlgorithm: FlushAlgorithm
|
|
): void {
|
|
assert(isTransformStream(stream));
|
|
assert(stream[sym.transformStreamController] === undefined);
|
|
controller[sym.controlledTransformStream] = stream;
|
|
stream[sym.transformStreamController] = controller;
|
|
controller[sym.transformAlgorithm] = transformAlgorithm;
|
|
controller[sym.flushAlgorithm] = flushAlgorithm;
|
|
}
|
|
|
|
export function setUpTransformStreamDefaultControllerFromTransformer<I, O>(
|
|
stream: TransformStreamImpl<I, O>,
|
|
transformer: Transformer<I, O>
|
|
): void {
|
|
assert(transformer);
|
|
const controller = Object.create(
|
|
TransformStreamDefaultControllerImpl.prototype
|
|
) as TransformStreamDefaultControllerImpl<I, O>;
|
|
let transformAlgorithm: TransformAlgorithm<I> = (chunk) => {
|
|
try {
|
|
transformStreamDefaultControllerEnqueue(
|
|
controller,
|
|
// it defaults to no tranformation, so I is assumed to be O
|
|
(chunk as unknown) as O
|
|
);
|
|
} catch (e) {
|
|
return Promise.reject(e);
|
|
}
|
|
return Promise.resolve();
|
|
};
|
|
const transformMethod = transformer.transform;
|
|
if (transformMethod) {
|
|
if (typeof transformMethod !== "function") {
|
|
throw new TypeError("tranformer.transform must be callable.");
|
|
}
|
|
transformAlgorithm = async (chunk): Promise<void> =>
|
|
call(transformMethod, transformer, [chunk, controller]);
|
|
}
|
|
const flushAlgorithm = createAlgorithmFromUnderlyingMethod(
|
|
transformer,
|
|
"flush",
|
|
0,
|
|
controller
|
|
);
|
|
setUpTransformStreamDefaultController(
|
|
stream,
|
|
controller,
|
|
transformAlgorithm,
|
|
flushAlgorithm
|
|
);
|
|
}
|
|
|
|
function setUpWritableStreamDefaultController<W>(
|
|
stream: WritableStreamImpl<W>,
|
|
controller: WritableStreamDefaultControllerImpl<W>,
|
|
startAlgorithm: StartAlgorithm,
|
|
writeAlgorithm: WriteAlgorithm<W>,
|
|
closeAlgorithm: CloseAlgorithm,
|
|
abortAlgorithm: AbortAlgorithm,
|
|
highWaterMark: number,
|
|
sizeAlgorithm: SizeAlgorithm<W>
|
|
): void {
|
|
assert(isWritableStream(stream));
|
|
assert(stream[sym.writableStreamController] === undefined);
|
|
controller[sym.controlledWritableStream] = stream;
|
|
stream[sym.writableStreamController] = controller;
|
|
controller[sym.queue] = [];
|
|
controller[sym.queueTotalSize] = 0;
|
|
controller[sym.started] = false;
|
|
controller[sym.strategySizeAlgorithm] = sizeAlgorithm;
|
|
controller[sym.strategyHWM] = highWaterMark;
|
|
controller[sym.writeAlgorithm] = writeAlgorithm;
|
|
controller[sym.closeAlgorithm] = closeAlgorithm;
|
|
controller[sym.abortAlgorithm] = abortAlgorithm;
|
|
const backpressure = writableStreamDefaultControllerGetBackpressure(
|
|
controller
|
|
);
|
|
writableStreamUpdateBackpressure(stream, backpressure);
|
|
const startResult = startAlgorithm();
|
|
const startPromise = Promise.resolve(startResult);
|
|
setPromiseIsHandledToTrue(
|
|
startPromise.then(
|
|
() => {
|
|
assert(
|
|
stream[sym.state] === "writable" || stream[sym.state] === "erroring"
|
|
);
|
|
controller[sym.started] = true;
|
|
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
|
|
},
|
|
(r) => {
|
|
assert(
|
|
stream[sym.state] === "writable" || stream[sym.state] === "erroring"
|
|
);
|
|
controller[sym.started] = true;
|
|
writableStreamDealWithRejection(stream, r);
|
|
}
|
|
)
|
|
);
|
|
}
|
|
|
|
export function setUpWritableStreamDefaultControllerFromUnderlyingSink<W>(
|
|
stream: WritableStreamImpl<W>,
|
|
underlyingSink: UnderlyingSink<W>,
|
|
highWaterMark: number,
|
|
sizeAlgorithm: SizeAlgorithm<W>
|
|
): void {
|
|
assert(underlyingSink);
|
|
const controller = Object.create(
|
|
WritableStreamDefaultControllerImpl.prototype
|
|
);
|
|
const startAlgorithm = (): void | PromiseLike<void> => {
|
|
return invokeOrNoop(underlyingSink, "start", controller);
|
|
};
|
|
const writeAlgorithm = createAlgorithmFromUnderlyingMethod(
|
|
underlyingSink,
|
|
"write",
|
|
1,
|
|
controller
|
|
);
|
|
setFunctionName(writeAlgorithm, "[[writeAlgorithm]]");
|
|
const closeAlgorithm = createAlgorithmFromUnderlyingMethod(
|
|
underlyingSink,
|
|
"close",
|
|
0
|
|
);
|
|
setFunctionName(closeAlgorithm, "[[closeAlgorithm]]");
|
|
const abortAlgorithm = createAlgorithmFromUnderlyingMethod(
|
|
underlyingSink,
|
|
"abort",
|
|
1
|
|
);
|
|
setFunctionName(abortAlgorithm, "[[abortAlgorithm]]");
|
|
setUpWritableStreamDefaultController(
|
|
stream,
|
|
controller,
|
|
startAlgorithm,
|
|
writeAlgorithm,
|
|
closeAlgorithm,
|
|
abortAlgorithm,
|
|
highWaterMark,
|
|
sizeAlgorithm
|
|
);
|
|
}
|
|
|
|
function transformStreamDefaultControllerClearAlgorithms<I, O>(
|
|
controller: TransformStreamDefaultControllerImpl<I, O>
|
|
): void {
|
|
(controller as any)[sym.transformAlgorithm] = undefined;
|
|
(controller as any)[sym.flushAlgorithm] = undefined;
|
|
}
|
|
|
|
export function transformStreamDefaultControllerEnqueue<I, O>(
|
|
controller: TransformStreamDefaultControllerImpl<I, O>,
|
|
chunk: O
|
|
): void {
|
|
const stream = controller[sym.controlledTransformStream];
|
|
const readableController = stream[sym.readable][
|
|
sym.readableStreamController
|
|
] as ReadableStreamDefaultControllerImpl<O>;
|
|
if (!readableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
|
|
throw new TypeError(
|
|
"TransformStream's readable controller cannot be closed or enqueued."
|
|
);
|
|
}
|
|
try {
|
|
readableStreamDefaultControllerEnqueue(readableController, chunk);
|
|
} catch (e) {
|
|
transformStreamErrorWritableAndUnblockWrite(stream, e);
|
|
throw stream[sym.readable][sym.storedError];
|
|
}
|
|
const backpressure = readableStreamDefaultControllerHasBackpressure(
|
|
readableController
|
|
);
|
|
if (backpressure) {
|
|
transformStreamSetBackpressure(stream, true);
|
|
}
|
|
}
|
|
|
|
export function transformStreamDefaultControllerError<I, O>(
|
|
controller: TransformStreamDefaultControllerImpl<I, O>,
|
|
e: any
|
|
): void {
|
|
transformStreamError(controller[sym.controlledTransformStream], e);
|
|
}
|
|
|
|
function transformStreamDefaultControllerPerformTransform<I, O>(
|
|
controller: TransformStreamDefaultControllerImpl<I, O>,
|
|
chunk: I
|
|
): Promise<void> {
|
|
const transformPromise = controller[sym.transformAlgorithm](chunk);
|
|
return transformPromise.then(undefined, (r) => {
|
|
transformStreamError(controller[sym.controlledTransformStream], r);
|
|
throw r;
|
|
});
|
|
}
|
|
|
|
function transformStreamDefaultSinkAbortAlgorithm<I, O>(
|
|
stream: TransformStreamImpl<I, O>,
|
|
reason: any
|
|
): Promise<void> {
|
|
transformStreamError(stream, reason);
|
|
return Promise.resolve(undefined);
|
|
}
|
|
|
|
function transformStreamDefaultSinkCloseAlgorithm<I, O>(
|
|
stream: TransformStreamImpl<I, O>
|
|
): Promise<void> {
|
|
const readable = stream[sym.readable];
|
|
const controller = stream[sym.transformStreamController];
|
|
const flushPromise = controller[sym.flushAlgorithm]();
|
|
transformStreamDefaultControllerClearAlgorithms(controller);
|
|
return flushPromise.then(
|
|
() => {
|
|
if (readable[sym.state] === "errored") {
|
|
throw readable[sym.storedError];
|
|
}
|
|
const readableController = readable[
|
|
sym.readableStreamController
|
|
] as ReadableStreamDefaultControllerImpl<O>;
|
|
if (
|
|
readableStreamDefaultControllerCanCloseOrEnqueue(readableController)
|
|
) {
|
|
readableStreamDefaultControllerClose(readableController);
|
|
}
|
|
},
|
|
(r) => {
|
|
transformStreamError(stream, r);
|
|
throw readable[sym.storedError];
|
|
}
|
|
);
|
|
}
|
|
|
|
function transformStreamDefaultSinkWriteAlgorithm<I, O>(
|
|
stream: TransformStreamImpl<I, O>,
|
|
chunk: I
|
|
): Promise<void> {
|
|
assert(stream[sym.writable][sym.state] === "writable");
|
|
const controller = stream[sym.transformStreamController];
|
|
if (stream[sym.backpressure]) {
|
|
const backpressureChangePromise = stream[sym.backpressureChangePromise];
|
|
assert(backpressureChangePromise);
|
|
return backpressureChangePromise.promise.then(() => {
|
|
const writable = stream[sym.writable];
|
|
const state = writable[sym.state];
|
|
if (state === "erroring") {
|
|
throw writable[sym.storedError];
|
|
}
|
|
assert(state === "writable");
|
|
return transformStreamDefaultControllerPerformTransform(
|
|
controller,
|
|
chunk
|
|
);
|
|
});
|
|
}
|
|
return transformStreamDefaultControllerPerformTransform(controller, chunk);
|
|
}
|
|
|
|
function transformStreamDefaultSourcePullAlgorithm<I, O>(
|
|
stream: TransformStreamImpl<I, O>
|
|
): Promise<void> {
|
|
assert(stream[sym.backpressure] === true);
|
|
assert(stream[sym.backpressureChangePromise] !== undefined);
|
|
transformStreamSetBackpressure(stream, false);
|
|
return stream[sym.backpressureChangePromise]!.promise;
|
|
}
|
|
|
|
function transformStreamError<I, O>(
|
|
stream: TransformStreamImpl<I, O>,
|
|
e: any
|
|
): void {
|
|
readableStreamDefaultControllerError(
|
|
stream[sym.readable][
|
|
sym.readableStreamController
|
|
] as ReadableStreamDefaultControllerImpl<O>,
|
|
e
|
|
);
|
|
transformStreamErrorWritableAndUnblockWrite(stream, e);
|
|
}
|
|
|
|
export function transformStreamDefaultControllerTerminate<I, O>(
|
|
controller: TransformStreamDefaultControllerImpl<I, O>
|
|
): void {
|
|
const stream = controller[sym.controlledTransformStream];
|
|
const readableController = stream[sym.readable][
|
|
sym.readableStreamController
|
|
] as ReadableStreamDefaultControllerImpl<O>;
|
|
readableStreamDefaultControllerClose(readableController);
|
|
const error = new TypeError("TransformStream is closed.");
|
|
transformStreamErrorWritableAndUnblockWrite(stream, error);
|
|
}
|
|
|
|
function transformStreamErrorWritableAndUnblockWrite<I, O>(
|
|
stream: TransformStreamImpl<I, O>,
|
|
e: any
|
|
): void {
|
|
transformStreamDefaultControllerClearAlgorithms(
|
|
stream[sym.transformStreamController]
|
|
);
|
|
writableStreamDefaultControllerErrorIfNeeded(
|
|
stream[sym.writable][sym.writableStreamController]!,
|
|
e
|
|
);
|
|
if (stream[sym.backpressure]) {
|
|
transformStreamSetBackpressure(stream, false);
|
|
}
|
|
}
|
|
|
|
function transformStreamSetBackpressure<I, O>(
|
|
stream: TransformStreamImpl<I, O>,
|
|
backpressure: boolean
|
|
): void {
|
|
assert(stream[sym.backpressure] !== backpressure);
|
|
if (stream[sym.backpressureChangePromise] !== undefined) {
|
|
stream[sym.backpressureChangePromise]!.resolve!(undefined);
|
|
}
|
|
stream[sym.backpressureChangePromise] = getDeferred<void>();
|
|
stream[sym.backpressure] = backpressure;
|
|
}
|
|
|
|
function transferArrayBuffer(buffer: ArrayBuffer): ArrayBuffer {
|
|
assert(!isDetachedBuffer(buffer));
|
|
const transferredIshVersion = buffer.slice(0);
|
|
|
|
Object.defineProperty(buffer, "byteLength", {
|
|
get(): number {
|
|
return 0;
|
|
},
|
|
});
|
|
(buffer as any)[sym.isFakeDetached] = true;
|
|
|
|
return transferredIshVersion;
|
|
}
|
|
|
|
export function validateAndNormalizeHighWaterMark(
|
|
highWaterMark: number
|
|
): number {
|
|
highWaterMark = Number(highWaterMark);
|
|
if (Number.isNaN(highWaterMark) || highWaterMark < 0) {
|
|
throw new RangeError(
|
|
`highWaterMark must be a positive number or Infinity. Received: ${highWaterMark}.`
|
|
);
|
|
}
|
|
return highWaterMark;
|
|
}
|
|
|
|
export function writableStreamAbort<W>(
|
|
stream: WritableStreamImpl<W>,
|
|
reason: any
|
|
): Promise<void> {
|
|
const state = stream[sym.state];
|
|
if (state === "closed" || state === "errored") {
|
|
return Promise.resolve(undefined);
|
|
}
|
|
if (stream[sym.pendingAbortRequest]) {
|
|
return stream[sym.pendingAbortRequest]!.promise.promise;
|
|
}
|
|
assert(state === "writable" || state === "erroring");
|
|
let wasAlreadyErroring = false;
|
|
if (state === "erroring") {
|
|
wasAlreadyErroring = true;
|
|
reason = undefined;
|
|
}
|
|
const promise = getDeferred<void>();
|
|
stream[sym.pendingAbortRequest] = { promise, reason, wasAlreadyErroring };
|
|
|
|
if (wasAlreadyErroring === false) {
|
|
writableStreamStartErroring(stream, reason);
|
|
}
|
|
return promise.promise;
|
|
}
|
|
|
|
function writableStreamAddWriteRequest<W>(
|
|
stream: WritableStreamImpl<W>
|
|
): Promise<void> {
|
|
assert(isWritableStream(stream));
|
|
assert(stream[sym.state] === "writable");
|
|
const promise = getDeferred<void>();
|
|
stream[sym.writeRequests].push(promise);
|
|
return promise.promise;
|
|
}
|
|
|
|
export function writableStreamClose<W>(
|
|
stream: WritableStreamImpl<W>
|
|
): Promise<void> {
|
|
const state = stream[sym.state];
|
|
if (state === "closed" || state === "errored") {
|
|
return Promise.reject(
|
|
new TypeError("Cannot close an already closed or errored WritableStream.")
|
|
);
|
|
}
|
|
assert(!writableStreamCloseQueuedOrInFlight(stream));
|
|
const promise = getDeferred<void>();
|
|
stream[sym.closeRequest] = promise;
|
|
const writer = stream[sym.writer];
|
|
if (writer && stream[sym.backpressure] && state === "writable") {
|
|
writer[sym.readyPromise].resolve!();
|
|
writer[sym.readyPromise].resolve = undefined;
|
|
writer[sym.readyPromise].reject = undefined;
|
|
}
|
|
writableStreamDefaultControllerClose(stream[sym.writableStreamController]!);
|
|
return promise.promise;
|
|
}
|
|
|
|
export function writableStreamCloseQueuedOrInFlight<W>(
|
|
stream: WritableStreamImpl<W>
|
|
): boolean {
|
|
return !(
|
|
stream[sym.closeRequest] === undefined &&
|
|
stream[sym.inFlightCloseRequest] === undefined
|
|
);
|
|
}
|
|
|
|
function writableStreamDealWithRejection<W>(
|
|
stream: WritableStreamImpl<W>,
|
|
error: any
|
|
): void {
|
|
const state = stream[sym.state];
|
|
if (state === "writable") {
|
|
writableStreamStartErroring(stream, error);
|
|
return;
|
|
}
|
|
assert(state === "erroring");
|
|
writableStreamFinishErroring(stream);
|
|
}
|
|
|
|
function writableStreamDefaultControllerAdvanceQueueIfNeeded<W>(
|
|
controller: WritableStreamDefaultControllerImpl<W>
|
|
): void {
|
|
const stream = controller[sym.controlledWritableStream];
|
|
if (!controller[sym.started]) {
|
|
return;
|
|
}
|
|
if (stream[sym.inFlightWriteRequest]) {
|
|
return;
|
|
}
|
|
const state = stream[sym.state];
|
|
assert(state !== "closed" && state !== "errored");
|
|
if (state === "erroring") {
|
|
writableStreamFinishErroring(stream);
|
|
return;
|
|
}
|
|
if (!controller[sym.queue].length) {
|
|
return;
|
|
}
|
|
const writeRecord = peekQueueValue(controller);
|
|
if (writeRecord === "close") {
|
|
writableStreamDefaultControllerProcessClose(controller);
|
|
} else {
|
|
writableStreamDefaultControllerProcessWrite(controller, writeRecord.chunk);
|
|
}
|
|
}
|
|
|
|
export function writableStreamDefaultControllerClearAlgorithms<W>(
|
|
controller: WritableStreamDefaultControllerImpl<W>
|
|
): void {
|
|
(controller as any)[sym.writeAlgorithm] = undefined;
|
|
(controller as any)[sym.closeAlgorithm] = undefined;
|
|
(controller as any)[sym.abortAlgorithm] = undefined;
|
|
(controller as any)[sym.strategySizeAlgorithm] = undefined;
|
|
}
|
|
|
|
function writableStreamDefaultControllerClose<W>(
|
|
controller: WritableStreamDefaultControllerImpl<W>
|
|
): void {
|
|
enqueueValueWithSize(controller, "close", 0);
|
|
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
|
|
}
|
|
|
|
export function writableStreamDefaultControllerError<W>(
|
|
controller: WritableStreamDefaultControllerImpl<W>,
|
|
error: any
|
|
): void {
|
|
const stream = controller[sym.controlledWritableStream];
|
|
assert(stream[sym.state] === "writable");
|
|
writableStreamDefaultControllerClearAlgorithms(controller);
|
|
writableStreamStartErroring(stream, error);
|
|
}
|
|
|
|
function writableStreamDefaultControllerErrorIfNeeded<W>(
|
|
controller: WritableStreamDefaultControllerImpl<W>,
|
|
error: any
|
|
): void {
|
|
if (controller[sym.controlledWritableStream][sym.state] === "writable") {
|
|
writableStreamDefaultControllerError(controller, error);
|
|
}
|
|
}
|
|
|
|
function writableStreamDefaultControllerGetBackpressure<W>(
|
|
controller: WritableStreamDefaultControllerImpl<W>
|
|
): boolean {
|
|
const desiredSize = writableStreamDefaultControllerGetDesiredSize(controller);
|
|
return desiredSize <= 0;
|
|
}
|
|
|
|
function writableStreamDefaultControllerGetChunkSize<W>(
|
|
controller: WritableStreamDefaultControllerImpl<W>,
|
|
chunk: W
|
|
): number {
|
|
let returnValue: number;
|
|
try {
|
|
returnValue = controller[sym.strategySizeAlgorithm](chunk);
|
|
} catch (e) {
|
|
writableStreamDefaultControllerErrorIfNeeded(controller, e);
|
|
return 1;
|
|
}
|
|
return returnValue;
|
|
}
|
|
|
|
function writableStreamDefaultControllerGetDesiredSize<W>(
|
|
controller: WritableStreamDefaultControllerImpl<W>
|
|
): number {
|
|
return controller[sym.strategyHWM] - controller[sym.queueTotalSize];
|
|
}
|
|
|
|
function writableStreamDefaultControllerProcessClose<W>(
|
|
controller: WritableStreamDefaultControllerImpl<W>
|
|
): void {
|
|
const stream = controller[sym.controlledWritableStream];
|
|
writableStreamMarkCloseRequestInFlight(stream);
|
|
dequeueValue(controller);
|
|
assert(controller[sym.queue].length === 0);
|
|
const sinkClosePromise = controller[sym.closeAlgorithm]();
|
|
writableStreamDefaultControllerClearAlgorithms(controller);
|
|
setPromiseIsHandledToTrue(
|
|
sinkClosePromise.then(
|
|
() => {
|
|
writableStreamFinishInFlightClose(stream);
|
|
},
|
|
(reason) => {
|
|
writableStreamFinishInFlightCloseWithError(stream, reason);
|
|
}
|
|
)
|
|
);
|
|
}
|
|
|
|
function writableStreamDefaultControllerProcessWrite<W>(
|
|
controller: WritableStreamDefaultControllerImpl<W>,
|
|
chunk: W
|
|
): void {
|
|
const stream = controller[sym.controlledWritableStream];
|
|
writableStreamMarkFirstWriteRequestInFlight(stream);
|
|
const sinkWritePromise = controller[sym.writeAlgorithm](chunk);
|
|
setPromiseIsHandledToTrue(
|
|
sinkWritePromise.then(
|
|
() => {
|
|
writableStreamFinishInFlightWrite(stream);
|
|
const state = stream[sym.state];
|
|
assert(state === "writable" || state === "erroring");
|
|
dequeueValue(controller);
|
|
if (
|
|
!writableStreamCloseQueuedOrInFlight(stream) &&
|
|
state === "writable"
|
|
) {
|
|
const backpressure = writableStreamDefaultControllerGetBackpressure(
|
|
controller
|
|
);
|
|
writableStreamUpdateBackpressure(stream, backpressure);
|
|
}
|
|
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
|
|
},
|
|
(reason) => {
|
|
if (stream[sym.state] === "writable") {
|
|
writableStreamDefaultControllerClearAlgorithms(controller);
|
|
}
|
|
writableStreamFinishInFlightWriteWithError(stream, reason);
|
|
}
|
|
)
|
|
);
|
|
}
|
|
|
|
function writableStreamDefaultControllerWrite<W>(
|
|
controller: WritableStreamDefaultControllerImpl<W>,
|
|
chunk: W,
|
|
chunkSize: number
|
|
): void {
|
|
const writeRecord = { chunk };
|
|
try {
|
|
enqueueValueWithSize(controller, writeRecord, chunkSize);
|
|
} catch (e) {
|
|
writableStreamDefaultControllerErrorIfNeeded(controller, e);
|
|
return;
|
|
}
|
|
const stream = controller[sym.controlledWritableStream];
|
|
if (
|
|
!writableStreamCloseQueuedOrInFlight(stream) &&
|
|
stream[sym.state] === "writable"
|
|
) {
|
|
const backpressure = writableStreamDefaultControllerGetBackpressure(
|
|
controller
|
|
);
|
|
writableStreamUpdateBackpressure(stream, backpressure);
|
|
}
|
|
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
|
|
}
|
|
|
|
export function writableStreamDefaultWriterAbort<W>(
|
|
writer: WritableStreamDefaultWriterImpl<W>,
|
|
reason: any
|
|
): Promise<void> {
|
|
const stream = writer[sym.ownerWritableStream];
|
|
assert(stream);
|
|
return writableStreamAbort(stream, reason);
|
|
}
|
|
|
|
export function writableStreamDefaultWriterClose<W>(
|
|
writer: WritableStreamDefaultWriterImpl<W>
|
|
): Promise<void> {
|
|
const stream = writer[sym.ownerWritableStream];
|
|
assert(stream);
|
|
return writableStreamClose(stream);
|
|
}
|
|
|
|
function writableStreamDefaultWriterCloseWithErrorPropagation<W>(
|
|
writer: WritableStreamDefaultWriterImpl<W>
|
|
): Promise<void> {
|
|
const stream = writer[sym.ownerWritableStream];
|
|
assert(stream);
|
|
const state = stream[sym.state];
|
|
if (writableStreamCloseQueuedOrInFlight(stream) || state === "closed") {
|
|
return Promise.resolve();
|
|
}
|
|
if (state === "errored") {
|
|
return Promise.reject(stream[sym.storedError]);
|
|
}
|
|
assert(state === "writable" || state === "erroring");
|
|
return writableStreamDefaultWriterClose(writer);
|
|
}
|
|
|
|
function writableStreamDefaultWriterEnsureClosePromiseRejected<W>(
|
|
writer: WritableStreamDefaultWriterImpl<W>,
|
|
error: any
|
|
): void {
|
|
if (writer[sym.closedPromise].reject) {
|
|
writer[sym.closedPromise].reject!(error);
|
|
} else {
|
|
writer[sym.closedPromise] = {
|
|
promise: Promise.reject(error),
|
|
};
|
|
}
|
|
setPromiseIsHandledToTrue(writer[sym.closedPromise].promise);
|
|
}
|
|
|
|
function writableStreamDefaultWriterEnsureReadyPromiseRejected<W>(
|
|
writer: WritableStreamDefaultWriterImpl<W>,
|
|
error: any
|
|
): void {
|
|
if (writer[sym.readyPromise].reject) {
|
|
writer[sym.readyPromise].reject!(error);
|
|
writer[sym.readyPromise].reject = undefined;
|
|
writer[sym.readyPromise].resolve = undefined;
|
|
} else {
|
|
writer[sym.readyPromise] = {
|
|
promise: Promise.reject(error),
|
|
};
|
|
}
|
|
setPromiseIsHandledToTrue(writer[sym.readyPromise].promise);
|
|
}
|
|
|
|
export function writableStreamDefaultWriterWrite<W>(
|
|
writer: WritableStreamDefaultWriterImpl<W>,
|
|
chunk: W
|
|
): Promise<void> {
|
|
const stream = writer[sym.ownerWritableStream];
|
|
assert(stream);
|
|
const controller = stream[sym.writableStreamController];
|
|
assert(controller);
|
|
const chunkSize = writableStreamDefaultControllerGetChunkSize(
|
|
controller,
|
|
chunk
|
|
);
|
|
if (stream !== writer[sym.ownerWritableStream]) {
|
|
return Promise.reject("Writer has incorrect WritableStream.");
|
|
}
|
|
const state = stream[sym.state];
|
|
if (state === "errored") {
|
|
return Promise.reject(stream[sym.storedError]);
|
|
}
|
|
if (writableStreamCloseQueuedOrInFlight(stream) || state === "closed") {
|
|
return Promise.reject(new TypeError("The stream is closed or closing."));
|
|
}
|
|
if (state === "erroring") {
|
|
return Promise.reject(stream[sym.storedError]);
|
|
}
|
|
assert(state === "writable");
|
|
const promise = writableStreamAddWriteRequest(stream);
|
|
writableStreamDefaultControllerWrite(controller, chunk, chunkSize);
|
|
return promise;
|
|
}
|
|
|
|
export function writableStreamDefaultWriterGetDesiredSize<W>(
|
|
writer: WritableStreamDefaultWriterImpl<W>
|
|
): number | null {
|
|
const stream = writer[sym.ownerWritableStream];
|
|
const state = stream[sym.state];
|
|
if (state === "errored" || state === "erroring") {
|
|
return null;
|
|
}
|
|
if (state === "closed") {
|
|
return 0;
|
|
}
|
|
return writableStreamDefaultControllerGetDesiredSize(
|
|
stream[sym.writableStreamController]!
|
|
);
|
|
}
|
|
|
|
export function writableStreamDefaultWriterRelease<W>(
|
|
writer: WritableStreamDefaultWriterImpl<W>
|
|
): void {
|
|
const stream = writer[sym.ownerWritableStream];
|
|
assert(stream);
|
|
assert(stream[sym.writer] === writer);
|
|
const releasedError = new TypeError(
|
|
"Writer was released and can no longer be used to monitor the stream's closedness."
|
|
);
|
|
writableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
|
|
writableStreamDefaultWriterEnsureClosePromiseRejected(writer, releasedError);
|
|
stream[sym.writer] = undefined;
|
|
(writer as any)[sym.ownerWritableStream] = undefined;
|
|
}
|
|
|
|
function writableStreamFinishErroring<W>(stream: WritableStreamImpl<W>): void {
|
|
assert(stream[sym.state] === "erroring");
|
|
assert(!writableStreamHasOperationMarkedInFlight(stream));
|
|
stream[sym.state] = "errored";
|
|
stream[sym.writableStreamController]![sym.errorSteps]();
|
|
const storedError = stream[sym.storedError];
|
|
for (const writeRequest of stream[sym.writeRequests]) {
|
|
assert(writeRequest.reject);
|
|
writeRequest.reject(storedError);
|
|
}
|
|
stream[sym.writeRequests] = [];
|
|
if (!stream[sym.pendingAbortRequest]) {
|
|
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
|
|
return;
|
|
}
|
|
const abortRequest = stream[sym.pendingAbortRequest];
|
|
assert(abortRequest);
|
|
stream[sym.pendingAbortRequest] = undefined;
|
|
if (abortRequest.wasAlreadyErroring) {
|
|
assert(abortRequest.promise.reject);
|
|
abortRequest.promise.reject(storedError);
|
|
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
|
|
return;
|
|
}
|
|
const promise = stream[sym.writableStreamController];
|
|
setPromiseIsHandledToTrue(
|
|
promise.then(
|
|
() => {
|
|
assert(abortRequest.promise.resolve);
|
|
abortRequest.promise.resolve();
|
|
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
|
|
},
|
|
(reason) => {
|
|
assert(abortRequest.promise.reject);
|
|
abortRequest.promise.reject(reason);
|
|
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
|
|
}
|
|
)
|
|
);
|
|
}
|
|
|
|
function writableStreamFinishInFlightClose<W>(
|
|
stream: WritableStreamImpl<W>
|
|
): void {
|
|
assert(stream[sym.inFlightCloseRequest]);
|
|
stream[sym.inFlightCloseRequest]?.resolve!();
|
|
stream[sym.inFlightCloseRequest] = undefined;
|
|
const state = stream[sym.state];
|
|
assert(state === "writable" || state === "erroring");
|
|
if (state === "erroring") {
|
|
stream[sym.storedError] = undefined;
|
|
if (stream[sym.pendingAbortRequest]) {
|
|
stream[sym.pendingAbortRequest]!.promise.resolve!();
|
|
stream[sym.pendingAbortRequest] = undefined;
|
|
}
|
|
}
|
|
stream[sym.state] = "closed";
|
|
const writer = stream[sym.writer];
|
|
if (writer) {
|
|
writer[sym.closedPromise].resolve!();
|
|
}
|
|
assert(stream[sym.pendingAbortRequest] === undefined);
|
|
assert(stream[sym.storedError] === undefined);
|
|
}
|
|
|
|
function writableStreamFinishInFlightCloseWithError<W>(
|
|
stream: WritableStreamImpl<W>,
|
|
error: any
|
|
): void {
|
|
assert(stream[sym.inFlightCloseRequest]);
|
|
stream[sym.inFlightCloseRequest]?.reject!(error);
|
|
stream[sym.inFlightCloseRequest] = undefined;
|
|
assert(stream[sym.state] === "writable" || stream[sym.state] === "erroring");
|
|
if (stream[sym.pendingAbortRequest]) {
|
|
stream[sym.pendingAbortRequest]?.promise.reject!(error);
|
|
stream[sym.pendingAbortRequest] = undefined;
|
|
}
|
|
writableStreamDealWithRejection(stream, error);
|
|
}
|
|
|
|
function writableStreamFinishInFlightWrite<W>(
|
|
stream: WritableStreamImpl<W>
|
|
): void {
|
|
assert(stream[sym.inFlightWriteRequest]);
|
|
stream[sym.inFlightWriteRequest]!.resolve();
|
|
stream[sym.inFlightWriteRequest] = undefined;
|
|
}
|
|
|
|
function writableStreamFinishInFlightWriteWithError<W>(
|
|
stream: WritableStreamImpl<W>,
|
|
error: any
|
|
): void {
|
|
assert(stream[sym.inFlightWriteRequest]);
|
|
stream[sym.inFlightWriteRequest]!.reject!(error);
|
|
stream[sym.inFlightWriteRequest] = undefined;
|
|
assert(stream[sym.state] === "writable" || stream[sym.state] === "erroring");
|
|
writableStreamDealWithRejection(stream, error);
|
|
}
|
|
|
|
function writableStreamHasOperationMarkedInFlight<W>(
|
|
stream: WritableStreamImpl<W>
|
|
): boolean {
|
|
return !(
|
|
stream[sym.inFlightWriteRequest] === undefined &&
|
|
stream[sym.inFlightCloseRequest] === undefined
|
|
);
|
|
}
|
|
|
|
function writableStreamMarkCloseRequestInFlight<W>(
|
|
stream: WritableStreamImpl<W>
|
|
): void {
|
|
assert(stream[sym.inFlightCloseRequest] === undefined);
|
|
assert(stream[sym.closeRequest] !== undefined);
|
|
stream[sym.inFlightCloseRequest] = stream[sym.closeRequest];
|
|
stream[sym.closeRequest] = undefined;
|
|
}
|
|
|
|
function writableStreamMarkFirstWriteRequestInFlight<W>(
|
|
stream: WritableStreamImpl<W>
|
|
): void {
|
|
assert(stream[sym.inFlightWriteRequest] === undefined);
|
|
assert(stream[sym.writeRequests].length);
|
|
const writeRequest = stream[sym.writeRequests].shift();
|
|
stream[sym.inFlightWriteRequest] = writeRequest;
|
|
}
|
|
|
|
function writableStreamRejectCloseAndClosedPromiseIfNeeded<W>(
|
|
stream: WritableStreamImpl<W>
|
|
): void {
|
|
assert(stream[sym.state] === "errored");
|
|
if (stream[sym.closeRequest]) {
|
|
assert(stream[sym.inFlightCloseRequest] === undefined);
|
|
stream[sym.closeRequest]!.reject!(stream[sym.storedError]);
|
|
stream[sym.closeRequest] = undefined;
|
|
}
|
|
const writer = stream[sym.writer];
|
|
if (writer) {
|
|
writer[sym.closedPromise].reject!(stream[sym.storedError]);
|
|
setPromiseIsHandledToTrue(writer[sym.closedPromise].promise);
|
|
}
|
|
}
|
|
|
|
function writableStreamStartErroring<W>(
|
|
stream: WritableStreamImpl<W>,
|
|
reason: any
|
|
): void {
|
|
assert(stream[sym.storedError] === undefined);
|
|
assert(stream[sym.state] === "writable");
|
|
const controller = stream[sym.writableStreamController];
|
|
assert(controller);
|
|
stream[sym.state] = "erroring";
|
|
stream[sym.storedError] = reason;
|
|
const writer = stream[sym.writer];
|
|
if (writer) {
|
|
writableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
|
|
}
|
|
if (
|
|
!writableStreamHasOperationMarkedInFlight(stream) &&
|
|
controller[sym.started]
|
|
) {
|
|
writableStreamFinishErroring(stream);
|
|
}
|
|
}
|
|
|
|
function writableStreamUpdateBackpressure<W>(
|
|
stream: WritableStreamImpl<W>,
|
|
backpressure: boolean
|
|
): void {
|
|
assert(stream[sym.state] === "writable");
|
|
assert(!writableStreamCloseQueuedOrInFlight(stream));
|
|
const writer = stream[sym.writer];
|
|
if (writer && backpressure !== stream[sym.backpressure]) {
|
|
if (backpressure) {
|
|
writer[sym.readyPromise] = getDeferred();
|
|
} else {
|
|
assert(backpressure === false);
|
|
writer[sym.readyPromise].resolve!();
|
|
writer[sym.readyPromise].resolve = undefined;
|
|
writer[sym.readyPromise].reject = undefined;
|
|
}
|
|
}
|
|
stream[sym.backpressure] = backpressure;
|
|
}
|
|
|
|
/* eslint-enable */
|