// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
// @ts-check
///
///
///
///
const core = globalThis.Deno.core;
const internals = globalThis.__bootstrap.internals;
const {
op_arraybuffer_was_detached,
op_transfer_arraybuffer,
op_readable_stream_resource_allocate,
op_readable_stream_resource_get_sink,
op_readable_stream_resource_write_error,
op_readable_stream_resource_write_buf,
op_readable_stream_resource_write_sync,
op_readable_stream_resource_close,
op_readable_stream_resource_await_close,
} = core.ensureFastOps();
import * as webidl from "ext:deno_webidl/00_webidl.js";
import { structuredClone } from "ext:deno_web/02_structured_clone.js";
import {
AbortSignalPrototype,
add,
newSignal,
remove,
signalAbort,
} from "ext:deno_web/03_abort_signal.js";
const primordials = globalThis.__bootstrap.primordials;
const {
ArrayBuffer,
ArrayBufferIsView,
ArrayBufferPrototype,
ArrayBufferPrototypeGetByteLength,
ArrayBufferPrototypeSlice,
ArrayPrototypeMap,
ArrayPrototypePush,
ArrayPrototypeShift,
AsyncGeneratorPrototype,
BigInt64Array,
BigUint64Array,
DataView,
DataViewPrototypeGetBuffer,
DataViewPrototypeGetByteLength,
DataViewPrototypeGetByteOffset,
Float32Array,
Float64Array,
Int16Array,
Int32Array,
Int8Array,
MathMin,
NumberIsInteger,
NumberIsNaN,
ObjectCreate,
ObjectDefineProperty,
ObjectGetPrototypeOf,
ObjectPrototypeIsPrototypeOf,
ObjectSetPrototypeOf,
Promise,
PromisePrototypeCatch,
PromisePrototypeThen,
PromiseReject,
PromiseResolve,
RangeError,
ReflectHas,
SafeFinalizationRegistry,
SafePromiseAll,
SafeWeakMap,
// TODO(lucacasonato): add SharedArrayBuffer to primordials
// SharedArrayBufferPrototype,
String,
Symbol,
SymbolAsyncIterator,
SymbolIterator,
SymbolFor,
TypeError,
TypedArrayPrototypeGetBuffer,
TypedArrayPrototypeGetByteLength,
TypedArrayPrototypeGetByteOffset,
TypedArrayPrototypeGetSymbolToStringTag,
TypedArrayPrototypeSet,
TypedArrayPrototypeSlice,
Uint16Array,
Uint32Array,
Uint8Array,
Uint8ClampedArray,
WeakMapPrototypeGet,
WeakMapPrototypeHas,
WeakMapPrototypeSet,
queueMicrotask,
} = primordials;
import { createFilteredInspectProxy } from "ext:deno_console/01_console.js";
import { assert, AssertionError } from "ext:deno_web/00_infra.js";
/** @template T */
class Deferred {
/** @type {Promise} */
#promise;
/** @type {(reject?: any) => void} */
#reject;
/** @type {(value: T | PromiseLike) => void} */
#resolve;
/** @type {"pending" | "fulfilled"} */
#state = "pending";
constructor() {
this.#promise = new Promise((resolve, reject) => {
this.#resolve = resolve;
this.#reject = reject;
});
}
/** @returns {Promise} */
get promise() {
return this.#promise;
}
/** @returns {"pending" | "fulfilled"} */
get state() {
return this.#state;
}
/** @param {any=} reason */
reject(reason) {
// already settled promises are a no-op
if (this.#state !== "pending") {
return;
}
this.#state = "fulfilled";
this.#reject(reason);
}
/** @param {T | PromiseLike} value */
resolve(value) {
// already settled promises are a no-op
if (this.#state !== "pending") {
return;
}
this.#state = "fulfilled";
this.#resolve(value);
}
}
/**
* @template T
* @param {T | PromiseLike} value
* @returns {Promise}
*/
function resolvePromiseWith(value) {
return new Promise((resolve) => resolve(value));
}
/** @param {any} e */
function rethrowAssertionErrorRejection(e) {
if (e && ObjectPrototypeIsPrototypeOf(AssertionError.prototype, e)) {
queueMicrotask(() => {
console.error(`Internal Error: ${e.stack}`);
});
}
}
/** @param {Promise} promise */
function setPromiseIsHandledToTrue(promise) {
PromisePrototypeThen(promise, undefined, rethrowAssertionErrorRejection);
}
/**
* @template T
* @template TResult1
* @template TResult2
* @param {Promise} promise
* @param {(value: T) => TResult1 | PromiseLike} fulfillmentHandler
* @param {(reason: any) => TResult2 | PromiseLike=} rejectionHandler
* @returns {Promise}
*/
function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
return PromisePrototypeThen(promise, fulfillmentHandler, rejectionHandler);
}
/**
* @template T
* @template TResult
* @param {Promise} promise
* @param {(value: T) => TResult | PromiseLike} onFulfilled
* @returns {void}
*/
function uponFulfillment(promise, onFulfilled) {
uponPromise(promise, onFulfilled);
}
/**
* @template T
* @template TResult
* @param {Promise} promise
* @param {(value: T) => TResult | PromiseLike} onRejected
* @returns {void}
*/
function uponRejection(promise, onRejected) {
uponPromise(promise, undefined, onRejected);
}
/**
* @template T
* @template TResult1
* @template TResult2
* @param {Promise} promise
* @param {(value: T) => TResult1 | PromiseLike} onFulfilled
* @param {(reason: any) => TResult2 | PromiseLike=} onRejected
* @returns {void}
*/
function uponPromise(promise, onFulfilled, onRejected) {
PromisePrototypeThen(
PromisePrototypeThen(promise, onFulfilled, onRejected),
undefined,
rethrowAssertionErrorRejection,
);
}
class Queue {
#head = null;
#tail = null;
#size = 0;
enqueue(value) {
const node = { value, next: null };
if (this.#head === null) {
this.#head = node;
this.#tail = node;
} else {
this.#tail.next = node;
this.#tail = node;
}
return ++this.#size;
}
dequeue() {
const node = this.#head;
if (node === null) {
return null;
}
if (this.#head === this.#tail) {
this.#tail = null;
}
this.#head = this.#head.next;
this.#size--;
return node.value;
}
peek() {
if (this.#head === null) {
return null;
}
return this.#head.value;
}
get size() {
return this.#size;
}
}
/**
* @param {ArrayBufferLike} O
* @returns {boolean}
*/
function isDetachedBuffer(O) {
// deno-lint-ignore prefer-primordials
if (ObjectPrototypeIsPrototypeOf(SharedArrayBuffer.prototype, O)) {
return false;
}
return ArrayBufferPrototypeGetByteLength(O) === 0 &&
op_arraybuffer_was_detached(O);
}
/**
* @param {ArrayBufferLike} O
* @returns {boolean}
*/
function canTransferArrayBuffer(O) {
assert(typeof O === "object");
assert(
ObjectPrototypeIsPrototypeOf(ArrayBufferPrototype, O) ||
// deno-lint-ignore prefer-primordials
ObjectPrototypeIsPrototypeOf(SharedArrayBuffer.prototype, O),
);
if (isDetachedBuffer(O)) {
return false;
}
// TODO(@crowlKats): 4. If SameValue(O.[[ArrayBufferDetachKey]], undefined) is false, return false.
return true;
}
/**
* @param {ArrayBufferLike} O
* @returns {ArrayBufferLike}
*/
function transferArrayBuffer(O) {
return op_transfer_arraybuffer(O);
}
/**
* @param {ArrayBufferLike} O
* @returns {number}
*/
function getArrayBufferByteLength(O) {
// deno-lint-ignore prefer-primordials
if (ObjectPrototypeIsPrototypeOf(SharedArrayBuffer.prototype, O)) {
// TODO(petamoriken): use primordials
// deno-lint-ignore prefer-primordials
return O.byteLength;
} else {
return ArrayBufferPrototypeGetByteLength(O);
}
}
/**
* @param {ArrayBufferView} O
* @returns {Uint8Array}
*/
function cloneAsUint8Array(O) {
assert(typeof O === "object");
assert(ArrayBufferIsView(O));
if (TypedArrayPrototypeGetSymbolToStringTag(O) !== undefined) {
// TypedArray
return TypedArrayPrototypeSlice(
new Uint8Array(
TypedArrayPrototypeGetBuffer(/** @type {Uint8Array} */ (O)),
TypedArrayPrototypeGetByteOffset(/** @type {Uint8Array} */ (O)),
TypedArrayPrototypeGetByteLength(/** @type {Uint8Array} */ (O)),
),
);
} else {
// DataView
return TypedArrayPrototypeSlice(
new Uint8Array(
DataViewPrototypeGetBuffer(/** @type {DataView} */ (O)),
DataViewPrototypeGetByteOffset(/** @type {DataView} */ (O)),
DataViewPrototypeGetByteLength(/** @type {DataView} */ (O)),
),
);
}
}
const _abortAlgorithm = Symbol("[[abortAlgorithm]]");
const _abortSteps = Symbol("[[AbortSteps]]");
const _autoAllocateChunkSize = Symbol("[[autoAllocateChunkSize]]");
const _backpressure = Symbol("[[backpressure]]");
const _backpressureChangePromise = Symbol("[[backpressureChangePromise]]");
const _byobRequest = Symbol("[[byobRequest]]");
const _cancelAlgorithm = Symbol("[[cancelAlgorithm]]");
const _cancelSteps = Symbol("[[CancelSteps]]");
const _close = Symbol("close sentinel");
const _closeAlgorithm = Symbol("[[closeAlgorithm]]");
const _closedPromise = Symbol("[[closedPromise]]");
const _closeRequest = Symbol("[[closeRequest]]");
const _closeRequested = Symbol("[[closeRequested]]");
const _controller = Symbol("[[controller]]");
const _detached = Symbol("[[Detached]]");
const _disturbed = Symbol("[[disturbed]]");
const _errorSteps = Symbol("[[ErrorSteps]]");
const _finishPromise = Symbol("[[finishPromise]]");
const _flushAlgorithm = Symbol("[[flushAlgorithm]]");
const _globalObject = Symbol("[[globalObject]]");
const _highWaterMark = Symbol("[[highWaterMark]]");
const _inFlightCloseRequest = Symbol("[[inFlightCloseRequest]]");
const _inFlightWriteRequest = Symbol("[[inFlightWriteRequest]]");
const _pendingAbortRequest = Symbol("[pendingAbortRequest]");
const _pendingPullIntos = Symbol("[[pendingPullIntos]]");
const _preventCancel = Symbol("[[preventCancel]]");
const _pullAgain = Symbol("[[pullAgain]]");
const _pullAlgorithm = Symbol("[[pullAlgorithm]]");
const _pulling = Symbol("[[pulling]]");
const _pullSteps = Symbol("[[PullSteps]]");
const _releaseSteps = Symbol("[[ReleaseSteps]]");
const _queue = Symbol("[[queue]]");
const _queueTotalSize = Symbol("[[queueTotalSize]]");
const _readable = Symbol("[[readable]]");
const _reader = Symbol("[[reader]]");
const _readRequests = Symbol("[[readRequests]]");
const _readIntoRequests = Symbol("[[readIntoRequests]]");
const _readyPromise = Symbol("[[readyPromise]]");
const _signal = Symbol("[[signal]]");
const _started = Symbol("[[started]]");
const _state = Symbol("[[state]]");
const _storedError = Symbol("[[storedError]]");
const _strategyHWM = Symbol("[[strategyHWM]]");
const _strategySizeAlgorithm = Symbol("[[strategySizeAlgorithm]]");
const _stream = Symbol("[[stream]]");
const _transformAlgorithm = Symbol("[[transformAlgorithm]]");
const _view = Symbol("[[view]]");
const _writable = Symbol("[[writable]]");
const _writeAlgorithm = Symbol("[[writeAlgorithm]]");
const _writer = Symbol("[[writer]]");
const _writeRequests = Symbol("[[writeRequests]]");
const _brand = webidl.brand;
function noop() {}
async function noopAsync() {}
const _defaultStartAlgorithm = noop;
const _defaultWriteAlgorithm = noopAsync;
const _defaultCloseAlgorithm = noopAsync;
const _defaultAbortAlgorithm = noopAsync;
const _defaultPullAlgorithm = noopAsync;
const _defaultFlushAlgorithm = noopAsync;
const _defaultCancelAlgorithm = noopAsync;
/**
* @template R
* @param {ReadableStream} stream
* @returns {ReadableStreamDefaultReader}
*/
function acquireReadableStreamDefaultReader(stream) {
const reader = new ReadableStreamDefaultReader(_brand);
setUpReadableStreamDefaultReader(reader, stream);
return reader;
}
/**
* @template R
* @param {ReadableStream} stream
* @returns {ReadableStreamBYOBReader}
*/
function acquireReadableStreamBYOBReader(stream) {
const reader = new ReadableStreamBYOBReader(_brand);
setUpReadableStreamBYOBReader(reader, stream);
return reader;
}
/**
* @template W
* @param {WritableStream} stream
* @returns {WritableStreamDefaultWriter}
*/
function acquireWritableStreamDefaultWriter(stream) {
return new WritableStreamDefaultWriter(stream);
}
/**
* @template R
* @param {() => void} startAlgorithm
* @param {() => Promise} pullAlgorithm
* @param {(reason: any) => Promise} cancelAlgorithm
* @param {number=} highWaterMark
* @param {((chunk: R) => number)=} sizeAlgorithm
* @returns {ReadableStream}
*/
function createReadableStream(
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark = 1,
sizeAlgorithm = () => 1,
) {
assert(isNonNegativeNumber(highWaterMark));
/** @type {ReadableStream} */
const stream = new ReadableStream(_brand);
initializeReadableStream(stream);
const controller = new ReadableStreamDefaultController(_brand);
setUpReadableStreamDefaultController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark,
sizeAlgorithm,
);
return stream;
}
/**
* @template W
* @param {(controller: WritableStreamDefaultController) => Promise} startAlgorithm
* @param {(chunk: W) => Promise} writeAlgorithm
* @param {() => Promise} closeAlgorithm
* @param {(reason: any) => Promise} abortAlgorithm
* @param {number} highWaterMark
* @param {(chunk: W) => number} sizeAlgorithm
* @returns {WritableStream}
*/
function createWritableStream(
startAlgorithm,
writeAlgorithm,
closeAlgorithm,
abortAlgorithm,
highWaterMark,
sizeAlgorithm,
) {
assert(isNonNegativeNumber(highWaterMark));
const stream = new WritableStream(_brand);
initializeWritableStream(stream);
const controller = new WritableStreamDefaultController(_brand);
setUpWritableStreamDefaultController(
stream,
controller,
startAlgorithm,
writeAlgorithm,
closeAlgorithm,
abortAlgorithm,
highWaterMark,
sizeAlgorithm,
);
return stream;
}
/**
* @template T
* @param {{ [_queue]: Array>, [_queueTotalSize]: number }} container
* @returns {T}
*/
function dequeueValue(container) {
assert(container[_queue] && typeof container[_queueTotalSize] === "number");
assert(container[_queue].size);
const valueWithSize = container[_queue].dequeue();
container[_queueTotalSize] -= valueWithSize.size;
if (container[_queueTotalSize] < 0) {
container[_queueTotalSize] = 0;
}
return valueWithSize.value;
}
/**
* @template T
* @param {{ [_queue]: Array>, [_queueTotalSize]: number }} container
* @param {T} value
* @param {number} size
* @returns {void}
*/
function enqueueValueWithSize(container, value, size) {
assert(container[_queue] && typeof container[_queueTotalSize] === "number");
if (isNonNegativeNumber(size) === false) {
throw RangeError("chunk size isn't a positive number");
}
if (size === Infinity) {
throw RangeError("chunk size is invalid");
}
container[_queue].enqueue({ value, size });
container[_queueTotalSize] += size;
}
/**
* @param {QueuingStrategy} strategy
* @param {number} defaultHWM
*/
function extractHighWaterMark(strategy, defaultHWM) {
if (strategy.highWaterMark === undefined) {
return defaultHWM;
}
const highWaterMark = strategy.highWaterMark;
if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
throw RangeError(
`Expected highWaterMark to be a positive number or Infinity, got "${highWaterMark}".`,
);
}
return highWaterMark;
}
/**
* @template T
* @param {QueuingStrategy} strategy
* @return {(chunk: T) => number}
*/
function extractSizeAlgorithm(strategy) {
if (strategy.size === undefined) {
return () => 1;
}
return (chunk) =>
webidl.invokeCallbackFunction(
strategy.size,
[chunk],
undefined,
webidl.converters["unrestricted double"],
"Failed to call `sizeAlgorithm`",
);
}
/**
* @param {() => void} startAlgorithm
* @param {() => Promise} pullAlgorithm
* @param {(reason: any) => Promise} cancelAlgorithm
* @returns {ReadableStream}
*/
function createReadableByteStream(
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
) {
const stream = new ReadableStream(_brand);
initializeReadableStream(stream);
const controller = new ReadableByteStreamController(_brand);
setUpReadableByteStreamController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
0,
undefined,
);
return stream;
}
/**
* @param {ReadableStream} stream
* @returns {void}
*/
function initializeReadableStream(stream) {
stream[_state] = "readable";
stream[_reader] = stream[_storedError] = undefined;
stream[_disturbed] = false;
}
/**
* @template I
* @template O
* @param {TransformStream} stream
* @param {Deferred} startPromise
* @param {number} writableHighWaterMark
* @param {(chunk: I) => number} writableSizeAlgorithm
* @param {number} readableHighWaterMark
* @param {(chunk: O) => number} readableSizeAlgorithm
*/
function initializeTransformStream(
stream,
startPromise,
writableHighWaterMark,
writableSizeAlgorithm,
readableHighWaterMark,
readableSizeAlgorithm,
) {
function startAlgorithm() {
return startPromise.promise;
}
function writeAlgorithm(chunk) {
return transformStreamDefaultSinkWriteAlgorithm(stream, chunk);
}
function abortAlgorithm(reason) {
return transformStreamDefaultSinkAbortAlgorithm(stream, reason);
}
function closeAlgorithm() {
return transformStreamDefaultSinkCloseAlgorithm(stream);
}
stream[_writable] = createWritableStream(
startAlgorithm,
writeAlgorithm,
closeAlgorithm,
abortAlgorithm,
writableHighWaterMark,
writableSizeAlgorithm,
);
function pullAlgorithm() {
return transformStreamDefaultSourcePullAlgorithm(stream);
}
function cancelAlgorithm(reason) {
return transformStreamDefaultSourceCancelAlgorithm(stream, reason);
}
stream[_readable] = createReadableStream(
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
readableHighWaterMark,
readableSizeAlgorithm,
);
stream[_backpressure] = stream[_backpressureChangePromise] = undefined;
transformStreamSetBackpressure(stream, true);
stream[_controller] = undefined;
}
/** @param {WritableStream} stream */
function initializeWritableStream(stream) {
stream[_state] = "writable";
stream[_storedError] =
stream[_writer] =
stream[_controller] =
stream[_inFlightWriteRequest] =
stream[_closeRequest] =
stream[_inFlightCloseRequest] =
stream[_pendingAbortRequest] =
undefined;
stream[_writeRequests] = [];
stream[_backpressure] = false;
}
/**
* @param {unknown} v
* @returns {v is number}
*/
function isNonNegativeNumber(v) {
return typeof v === "number" && v >= 0;
}
/**
* @param {unknown} value
* @returns {value is ReadableStream}
*/
function isReadableStream(value) {
return !(typeof value !== "object" || value === null || !value[_controller]);
}
/**
* @param {ReadableStream} stream
* @returns {boolean}
*/
function isReadableStreamLocked(stream) {
return stream[_reader] !== undefined;
}
/**
* @param {unknown} value
* @returns {value is ReadableStreamDefaultReader}
*/
function isReadableStreamDefaultReader(value) {
return !(typeof value !== "object" || value === null ||
!value[_readRequests]);
}
/**
* @param {unknown} value
* @returns {value is ReadableStreamBYOBReader}
*/
function isReadableStreamBYOBReader(value) {
return !(typeof value !== "object" || value === null ||
!ReflectHas(value, _readIntoRequests));
}
/**
* @param {ReadableStream} stream
* @returns {boolean}
*/
function isReadableStreamDisturbed(stream) {
assert(isReadableStream(stream));
return stream[_disturbed];
}
/**
* @param {Error | string | undefined} error
* @returns {string}
*/
function extractStringErrorFromError(error) {
if (typeof error == "string") {
return error;
}
const message = error?.message;
const stringMessage = typeof message == "string" ? message : String(message);
return stringMessage;
}
// We don't want to leak resources associated with our sink, even if something bad happens
const READABLE_STREAM_SOURCE_REGISTRY = new SafeFinalizationRegistry(
(external) => {
op_readable_stream_resource_close(external);
},
);
class ResourceStreamResourceSink {
external;
constructor(external) {
this.external = external;
READABLE_STREAM_SOURCE_REGISTRY.register(this, external, this);
}
close() {
if (this.external === undefined) {
return;
}
READABLE_STREAM_SOURCE_REGISTRY.unregister(this);
op_readable_stream_resource_close(this.external);
this.external = undefined;
}
}
/**
* @param {ReadableStreamDefaultReader} reader
* @param {any} sink
* @param {Uint8Array} chunk
*/
function readableStreamWriteChunkFn(reader, sink, chunk) {
// Empty chunk. Re-read.
if (chunk.length == 0) {
readableStreamReadFn(reader, sink);
return;
}
const res = op_readable_stream_resource_write_sync(sink.external, chunk);
if (res == 0) {
// Closed
reader.cancel("resource closed");
sink.close();
} else if (res == 1) {
// Successfully written (synchronous). Re-read.
readableStreamReadFn(reader, sink);
} else if (res == 2) {
// Full. If the channel is full, we perform an async await until we can write, and then return
// to a synchronous loop.
(async () => {
if (
await op_readable_stream_resource_write_buf(
sink.external,
chunk,
)
) {
readableStreamReadFn(reader, sink);
} else {
reader.cancel("resource closed");
sink.close();
}
})();
}
}
/**
* @param {ReadableStreamDefaultReader} reader
* @param {any} sink
*/
function readableStreamReadFn(reader, sink) {
// The ops here look like op_write_all/op_close, but we're not actually writing to a
// real resource.
let reentrant = true;
let gotChunk = undefined;
readableStreamDefaultReaderRead(reader, {
chunkSteps(chunk) {
// If the chunk has non-zero length, write it
if (reentrant) {
gotChunk = chunk;
} else {
readableStreamWriteChunkFn(reader, sink, chunk);
}
},
closeSteps() {
sink.close();
},
errorSteps(error) {
const success = op_readable_stream_resource_write_error(
sink.external,
extractStringErrorFromError(error),
);
// We don't cancel the reader if there was an error reading. We'll let the downstream
// consumer close the resource after it receives the error.
if (!success) {
reader.cancel("resource closed");
}
sink.close();
},
});
reentrant = false;
if (gotChunk) {
readableStreamWriteChunkFn(reader, sink, gotChunk);
}
}
/**
* Create a new resource that wraps a ReadableStream. The resource will support
* read operations, and those read operations will be fed by the output of the
* ReadableStream source.
* @param {ReadableStream} stream
* @returns {number}
*/
function resourceForReadableStream(stream) {
const reader = acquireReadableStreamDefaultReader(stream);
// Allocate the resource
const rid = op_readable_stream_resource_allocate();
// Close the Reader we get from the ReadableStream when the resource is closed, ignoring any errors
PromisePrototypeCatch(
PromisePrototypeThen(
op_readable_stream_resource_await_close(rid),
() => reader.cancel("resource closed"),
),
() => {},
);
// This allocation is freed when readableStreamReadFn is completed
const sink = new ResourceStreamResourceSink(
op_readable_stream_resource_get_sink(rid),
);
// Trigger the first read
readableStreamReadFn(reader, sink);
return rid;
}
const DEFAULT_CHUNK_SIZE = 64 * 1024; // 64 KiB
// A finalization registry to clean up underlying resources that are GC'ed.
const RESOURCE_REGISTRY = new SafeFinalizationRegistry((rid) => {
core.tryClose(rid);
});
const _readAll = Symbol("[[readAll]]");
const _original = Symbol("[[original]]");
/**
* Create a new ReadableStream object that is backed by a Resource that
* implements `Resource::read_return`. This object contains enough metadata to
* allow callers to bypass the JavaScript ReadableStream implementation and
* read directly from the underlying resource if they so choose (FastStream).
*
* @param {number} rid The resource ID to read from.
* @param {boolean=} autoClose If the resource should be auto-closed when the stream closes. Defaults to true.
* @returns {ReadableStream}
*/
function readableStreamForRid(rid, autoClose = true) {
const stream = new ReadableStream(_brand);
stream[_resourceBacking] = { rid, autoClose };
const tryClose = () => {
if (!autoClose) return;
RESOURCE_REGISTRY.unregister(stream);
core.tryClose(rid);
};
if (autoClose) {
RESOURCE_REGISTRY.register(stream, rid, stream);
}
const underlyingSource = {
type: "bytes",
async pull(controller) {
const v = controller.byobRequest.view;
try {
if (controller[_readAll] === true) {
// fast path for tee'd streams consuming body
const chunk = await core.readAll(rid);
if (TypedArrayPrototypeGetByteLength(chunk) > 0) {
controller.enqueue(chunk);
}
controller.close();
tryClose();
return;
}
const bytesRead = await core.read(rid, v);
if (bytesRead === 0) {
tryClose();
controller.close();
controller.byobRequest.respond(0);
} else {
controller.byobRequest.respond(bytesRead);
}
} catch (e) {
controller.error(e);
tryClose();
}
},
cancel() {
tryClose();
},
autoAllocateChunkSize: DEFAULT_CHUNK_SIZE,
};
initializeReadableStream(stream);
setUpReadableByteStreamControllerFromUnderlyingSource(
stream,
underlyingSource,
underlyingSource,
0,
);
return stream;
}
const promiseSymbol = SymbolFor("__promise");
const _isUnref = Symbol("isUnref");
/**
* Create a new ReadableStream object that is backed by a Resource that
* implements `Resource::read_return`. This readable stream supports being
* refed and unrefed by calling `readableStreamForRidUnrefableRef` and
* `readableStreamForRidUnrefableUnref` on it. Unrefable streams are not
* FastStream compatible.
*
* @param {number} rid The resource ID to read from.
* @returns {ReadableStream}
*/
function readableStreamForRidUnrefable(rid) {
const stream = new ReadableStream(_brand);
stream[promiseSymbol] = undefined;
stream[_isUnref] = false;
stream[_resourceBackingUnrefable] = { rid, autoClose: true };
const underlyingSource = {
type: "bytes",
async pull(controller) {
const v = controller.byobRequest.view;
try {
const promise = core.read(rid, v);
stream[promiseSymbol] = promise;
if (stream[_isUnref]) core.unrefOpPromise(promise);
const bytesRead = await promise;
stream[promiseSymbol] = undefined;
if (bytesRead === 0) {
core.tryClose(rid);
controller.close();
controller.byobRequest.respond(0);
} else {
controller.byobRequest.respond(bytesRead);
}
} catch (e) {
controller.error(e);
core.tryClose(rid);
}
},
cancel() {
core.tryClose(rid);
},
autoAllocateChunkSize: DEFAULT_CHUNK_SIZE,
};
initializeReadableStream(stream);
setUpReadableByteStreamControllerFromUnderlyingSource(
stream,
underlyingSource,
underlyingSource,
0,
);
return stream;
}
function readableStreamIsUnrefable(stream) {
return ReflectHas(stream, _isUnref);
}
function readableStreamForRidUnrefableRef(stream) {
if (!readableStreamIsUnrefable(stream)) {
throw new TypeError("Not an unrefable stream");
}
stream[_isUnref] = false;
if (stream[promiseSymbol] !== undefined) {
core.refOpPromise(stream[promiseSymbol]);
}
}
function readableStreamForRidUnrefableUnref(stream) {
if (!readableStreamIsUnrefable(stream)) {
throw new TypeError("Not an unrefable stream");
}
stream[_isUnref] = true;
if (stream[promiseSymbol] !== undefined) {
core.unrefOpPromise(stream[promiseSymbol]);
}
}
function getReadableStreamResourceBacking(stream) {
return stream[_resourceBacking];
}
function getReadableStreamResourceBackingUnrefable(stream) {
return stream[_resourceBackingUnrefable];
}
async function readableStreamCollectIntoUint8Array(stream) {
const resourceBacking = getReadableStreamResourceBacking(stream) ||
getReadableStreamResourceBackingUnrefable(stream);
const reader = acquireReadableStreamDefaultReader(stream);
if (resourceBacking) {
// fast path, read whole body in a single op call
try {
readableStreamDisturb(stream);
const promise = core.opAsync("op_read_all", resourceBacking.rid);
if (readableStreamIsUnrefable(stream)) {
stream[promiseSymbol] = promise;
if (stream[_isUnref]) core.unrefOpPromise(promise);
}
const buf = await promise;
stream[promiseSymbol] = undefined;
readableStreamThrowIfErrored(stream);
readableStreamClose(stream);
return buf;
} catch (err) {
readableStreamThrowIfErrored(stream);
readableStreamError(stream, err);
throw err;
} finally {
if (resourceBacking.autoClose) {
core.tryClose(resourceBacking.rid);
}
}
}
// slow path
/** @type {Uint8Array[]} */
const chunks = [];
let totalLength = 0;
// tee'd stream
if (stream[_original]) {
// One of the branches is consuming the stream
// signal controller.pull that we can consume it in a single op
stream[_original][_controller][_readAll] = true;
}
while (true) {
const { value: chunk, done } = await reader.read();
if (done) break;
if (TypedArrayPrototypeGetSymbolToStringTag(chunk) !== "Uint8Array") {
throw new TypeError(
"Can't convert value to Uint8Array while consuming the stream",
);
}
ArrayPrototypePush(chunks, chunk);
totalLength += TypedArrayPrototypeGetByteLength(chunk);
}
const finalBuffer = new Uint8Array(totalLength);
let offset = 0;
for (let i = 0; i < chunks.length; ++i) {
const chunk = chunks[i];
TypedArrayPrototypeSet(finalBuffer, chunk, offset);
offset += TypedArrayPrototypeGetByteLength(chunk);
}
return finalBuffer;
}
/**
* Create a new Writable object that is backed by a Resource that implements
* `Resource::write` / `Resource::write_all`. This object contains enough
* metadata to allow callers to bypass the JavaScript WritableStream
* implementation and write directly to the underlying resource if they so
* choose (FastStream).
*
* @param {number} rid The resource ID to write to.
* @param {boolean=} autoClose If the resource should be auto-closed when the stream closes. Defaults to true.
* @returns {ReadableStream}
*/
function writableStreamForRid(rid, autoClose = true) {
const stream = new WritableStream(_brand);
stream[_resourceBacking] = { rid, autoClose };
const tryClose = () => {
if (!autoClose) return;
RESOURCE_REGISTRY.unregister(stream);
core.tryClose(rid);
};
if (autoClose) {
RESOURCE_REGISTRY.register(stream, rid, stream);
}
const underlyingSink = {
async write(chunk, controller) {
try {
await core.writeAll(rid, chunk);
} catch (e) {
controller.error(e);
tryClose();
}
},
close() {
tryClose();
},
abort() {
tryClose();
},
};
initializeWritableStream(stream);
setUpWritableStreamDefaultControllerFromUnderlyingSink(
stream,
underlyingSink,
underlyingSink,
1,
() => 1,
);
return stream;
}
function getWritableStreamResourceBacking(stream) {
return stream[_resourceBacking];
}
/*
* @param {ReadableStream} stream
*/
function readableStreamThrowIfErrored(stream) {
if (stream[_state] === "errored") {
throw stream[_storedError];
}
}
/**
* @param {unknown} value
* @returns {value is WritableStream}
*/
function isWritableStream(value) {
return !(typeof value !== "object" || value === null ||
!ReflectHas(value, _controller));
}
/**
* @param {WritableStream} stream
* @returns {boolean}
*/
function isWritableStreamLocked(stream) {
if (stream[_writer] === undefined) {
return false;
}
return true;
}
/**
* @template T
* @param {{ [_queue]: Array>, [_queueTotalSize]: number }} container
* @returns {T | _close}
*/
function peekQueueValue(container) {
assert(
container[_queue] &&
typeof container[_queueTotalSize] === "number",
);
assert(container[_queue].size);
const valueWithSize = container[_queue].peek();
return valueWithSize.value;
}
/**
* @param {ReadableByteStreamController} controller
* @returns {void}
*/
function readableByteStreamControllerCallPullIfNeeded(controller) {
const shouldPull = readableByteStreamControllerShouldCallPull(controller);
if (!shouldPull) {
return;
}
if (controller[_pulling]) {
controller[_pullAgain] = true;
return;
}
assert(controller[_pullAgain] === false);
controller[_pulling] = true;
/** @type {Promise} */
const pullPromise = controller[_pullAlgorithm](controller);
setPromiseIsHandledToTrue(
PromisePrototypeThen(
pullPromise,
() => {
controller[_pulling] = false;
if (controller[_pullAgain]) {
controller[_pullAgain] = false;
readableByteStreamControllerCallPullIfNeeded(controller);
}
},
(e) => {
readableByteStreamControllerError(controller, e);
},
),
);
}
/**
* @param {ReadableByteStreamController} controller
* @returns {void}
*/
function readableByteStreamControllerClearAlgorithms(controller) {
controller[_pullAlgorithm] = undefined;
controller[_cancelAlgorithm] = undefined;
}
/**
* @param {ReadableByteStreamController} controller
* @param {any} e
*/
function readableByteStreamControllerError(controller, e) {
/** @type {ReadableStream} */
const stream = controller[_stream];
if (stream[_state] !== "readable") {
return;
}
readableByteStreamControllerClearPendingPullIntos(controller);
resetQueue(controller);
readableByteStreamControllerClearAlgorithms(controller);
readableStreamError(stream, e);
}
/**
* @param {ReadableByteStreamController} controller
* @returns {void}
*/
function readableByteStreamControllerClearPendingPullIntos(controller) {
readableByteStreamControllerInvalidateBYOBRequest(controller);
controller[_pendingPullIntos] = [];
}
/**
* @param {ReadableByteStreamController} controller
* @returns {void}
*/
function readableByteStreamControllerClose(controller) {
/** @type {ReadableStream} */
const stream = controller[_stream];
if (controller[_closeRequested] || stream[_state] !== "readable") {
return;
}
if (controller[_queueTotalSize] > 0) {
controller[_closeRequested] = true;
return;
}
if (controller[_pendingPullIntos].length !== 0) {
const firstPendingPullInto = controller[_pendingPullIntos][0];
if (firstPendingPullInto.bytesFilled > 0) {
const e = new TypeError(
"Insufficient bytes to fill elements in the given buffer",
);
readableByteStreamControllerError(controller, e);
throw e;
}
}
readableByteStreamControllerClearAlgorithms(controller);
readableStreamClose(stream);
}
/**
* @param {ReadableByteStreamController} controller
* @param {ArrayBufferView} chunk
*/
function readableByteStreamControllerEnqueue(controller, chunk) {
/** @type {ReadableStream} */
const stream = controller[_stream];
if (
controller[_closeRequested] ||
controller[_stream][_state] !== "readable"
) {
return;
}
let buffer, byteLength, byteOffset;
if (TypedArrayPrototypeGetSymbolToStringTag(chunk) === undefined) {
buffer = DataViewPrototypeGetBuffer(/** @type {DataView} */ (chunk));
byteLength = DataViewPrototypeGetByteLength(
/** @type {DataView} */ (chunk),
);
byteOffset = DataViewPrototypeGetByteOffset(
/** @type {DataView} */ (chunk),
);
} else {
buffer = TypedArrayPrototypeGetBuffer(/** @type {Uint8Array}} */ (chunk));
byteLength = TypedArrayPrototypeGetByteLength(
/** @type {Uint8Array} */ (chunk),
);
byteOffset = TypedArrayPrototypeGetByteOffset(
/** @type {Uint8Array} */ (chunk),
);
}
if (isDetachedBuffer(buffer)) {
throw new TypeError(
"chunk's buffer is detached and so cannot be enqueued",
);
}
const transferredBuffer = transferArrayBuffer(buffer);
if (controller[_pendingPullIntos].length !== 0) {
const firstPendingPullInto = controller[_pendingPullIntos][0];
// deno-lint-ignore prefer-primordials
if (isDetachedBuffer(firstPendingPullInto.buffer)) {
throw new TypeError(
"The BYOB request's buffer has been detached and so cannot be filled with an enqueued chunk",
);
}
readableByteStreamControllerInvalidateBYOBRequest(controller);
firstPendingPullInto.buffer = transferArrayBuffer(
// deno-lint-ignore prefer-primordials
firstPendingPullInto.buffer,
);
if (firstPendingPullInto.readerType === "none") {
readableByteStreamControllerEnqueueDetachedPullIntoToQueue(
controller,
firstPendingPullInto,
);
}
}
if (readableStreamHasDefaultReader(stream)) {
readableByteStreamControllerProcessReadRequestsUsingQueue(controller);
if (readableStreamGetNumReadRequests(stream) === 0) {
assert(controller[_pendingPullIntos].length === 0);
readableByteStreamControllerEnqueueChunkToQueue(
controller,
transferredBuffer,
byteOffset,
byteLength,
);
} else {
assert(controller[_queue].size === 0);
if (controller[_pendingPullIntos].length !== 0) {
assert(controller[_pendingPullIntos][0].readerType === "default");
readableByteStreamControllerShiftPendingPullInto(controller);
}
const transferredView = new Uint8Array(
transferredBuffer,
byteOffset,
byteLength,
);
readableStreamFulfillReadRequest(stream, transferredView, false);
}
} else if (readableStreamHasBYOBReader(stream)) {
readableByteStreamControllerEnqueueChunkToQueue(
controller,
transferredBuffer,
byteOffset,
byteLength,
);
readableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(
controller,
);
} else {
assert(isReadableStreamLocked(stream) === false);
readableByteStreamControllerEnqueueChunkToQueue(
controller,
transferredBuffer,
byteOffset,
byteLength,
);
}
readableByteStreamControllerCallPullIfNeeded(controller);
}
/**
* @param {ReadableByteStreamController} controller
* @param {ArrayBufferLike} buffer
* @param {number} byteOffset
* @param {number} byteLength
* @returns {void}
*/
function readableByteStreamControllerEnqueueChunkToQueue(
controller,
buffer,
byteOffset,
byteLength,
) {
controller[_queue].enqueue({ buffer, byteOffset, byteLength });
controller[_queueTotalSize] += byteLength;
}
/**
* @param {ReadableByteStreamController} controller
* @param {ArrayBufferLike} buffer
* @param {number} byteOffset
* @param {number} byteLength
* @returns {void}
*/
function readableByteStreamControllerEnqueueClonedChunkToQueue(
controller,
buffer,
byteOffset,
byteLength,
) {
let cloneResult;
try {
if (ObjectPrototypeIsPrototypeOf(ArrayBufferPrototype, buffer)) {
cloneResult = ArrayBufferPrototypeSlice(
buffer,
byteOffset,
byteOffset + byteLength,
);
} else {
// TODO(lucacasonato): add SharedArrayBuffer to primordials
// deno-lint-ignore prefer-primordials
cloneResult = buffer.slice(byteOffset, byteOffset + byteLength);
}
} catch (e) {
readableByteStreamControllerError(controller, e);
}
readableByteStreamControllerEnqueueChunkToQueue(
controller,
cloneResult,
0,
byteLength,
);
}
/**
* @param {ReadableByteStreamController} controller
* @param {PullIntoDescriptor} pullIntoDescriptor
* @returns {void}
*/
function readableByteStreamControllerEnqueueDetachedPullIntoToQueue(
controller,
pullIntoDescriptor,
) {
assert(pullIntoDescriptor.readerType === "none");
if (pullIntoDescriptor.bytesFilled > 0) {
readableByteStreamControllerEnqueueClonedChunkToQueue(
controller,
// deno-lint-ignore prefer-primordials
pullIntoDescriptor.buffer,
// deno-lint-ignore prefer-primordials
pullIntoDescriptor.byteOffset,
pullIntoDescriptor.bytesFilled,
);
}
readableByteStreamControllerShiftPendingPullInto(controller);
}
/**
* @param {ReadableByteStreamController} controller
* @returns {ReadableStreamBYOBRequest | null}
*/
function readableByteStreamControllerGetBYOBRequest(controller) {
if (
controller[_byobRequest] === null &&
controller[_pendingPullIntos].length !== 0
) {
const firstDescriptor = controller[_pendingPullIntos][0];
const view = new Uint8Array(
// deno-lint-ignore prefer-primordials
firstDescriptor.buffer,
// deno-lint-ignore prefer-primordials
firstDescriptor.byteOffset + firstDescriptor.bytesFilled,
// deno-lint-ignore prefer-primordials
firstDescriptor.byteLength - firstDescriptor.bytesFilled,
);
const byobRequest = new ReadableStreamBYOBRequest(_brand);
byobRequest[_controller] = controller;
byobRequest[_view] = view;
controller[_byobRequest] = byobRequest;
}
return controller[_byobRequest];
}
/**
* @param {ReadableByteStreamController} controller
* @returns {number | null}
*/
function readableByteStreamControllerGetDesiredSize(controller) {
const state = controller[_stream][_state];
if (state === "errored") {
return null;
}
if (state === "closed") {
return 0;
}
return controller[_strategyHWM] - controller[_queueTotalSize];
}
/**
* @param {{ [_queue]: any[], [_queueTotalSize]: number }} container
* @returns {void}
*/
function resetQueue(container) {
container[_queue] = new Queue();
container[_queueTotalSize] = 0;
}
/**
* @param {ReadableByteStreamController} controller
* @returns {void}
*/
function readableByteStreamControllerHandleQueueDrain(controller) {
assert(controller[_stream][_state] === "readable");
if (
controller[_queueTotalSize] === 0 && controller[_closeRequested]
) {
readableByteStreamControllerClearAlgorithms(controller);
readableStreamClose(controller[_stream]);
} else {
readableByteStreamControllerCallPullIfNeeded(controller);
}
}
/**
* @param {ReadableByteStreamController} controller
* @returns {boolean}
*/
function readableByteStreamControllerShouldCallPull(controller) {
/** @type {ReadableStream} */
const stream = controller[_stream];
if (
stream[_state] !== "readable" ||
controller[_closeRequested] ||
!controller[_started]
) {
return false;
}
if (
readableStreamHasDefaultReader(stream) &&
readableStreamGetNumReadRequests(stream) > 0
) {
return true;
}
if (
readableStreamHasBYOBReader(stream) &&
readableStreamGetNumReadIntoRequests(stream) > 0
) {
return true;
}
const desiredSize = readableByteStreamControllerGetDesiredSize(controller);
assert(desiredSize !== null);
return desiredSize > 0;
}
/**
* @template R
* @param {ReadableStream} stream
* @param {ReadRequest} readRequest
* @returns {void}
*/
function readableStreamAddReadRequest(stream, readRequest) {
assert(isReadableStreamDefaultReader(stream[_reader]));
assert(stream[_state] === "readable");
stream[_reader][_readRequests].enqueue(readRequest);
}
/**
* @param {ReadableStream} stream
* @param {ReadIntoRequest} readRequest
* @returns {void}
*/
function readableStreamAddReadIntoRequest(stream, readRequest) {
assert(isReadableStreamBYOBReader(stream[_reader]));
assert(stream[_state] === "readable" || stream[_state] === "closed");
ArrayPrototypePush(stream[_reader][_readIntoRequests], readRequest);
}
/**
* @template R
* @param {ReadableStream} stream
* @param {any=} reason
* @returns {Promise}
*/
function readableStreamCancel(stream, reason) {
stream[_disturbed] = true;
if (stream[_state] === "closed") {
return PromiseResolve(undefined);
}
if (stream[_state] === "errored") {
return PromiseReject(stream[_storedError]);
}
readableStreamClose(stream);
const reader = stream[_reader];
if (reader !== undefined && isReadableStreamBYOBReader(reader)) {
const readIntoRequests = reader[_readIntoRequests];
reader[_readIntoRequests] = [];
for (let i = 0; i < readIntoRequests.length; ++i) {
const readIntoRequest = readIntoRequests[i];
readIntoRequest.closeSteps(undefined);
}
}
/** @type {Promise} */
const sourceCancelPromise = stream[_controller][_cancelSteps](reason);
return PromisePrototypeThen(sourceCancelPromise, noop);
}
/**
* @template R
* @param {ReadableStream} stream
* @returns {void}
*/
function readableStreamClose(stream) {
assert(stream[_state] === "readable");
stream[_state] = "closed";
/** @type {ReadableStreamDefaultReader | undefined} */
const reader = stream[_reader];
if (!reader) {
return;
}
if (isReadableStreamDefaultReader(reader)) {
/** @type {Array>} */
const readRequests = reader[_readRequests];
while (readRequests.size !== 0) {
const readRequest = readRequests.dequeue();
readRequest.closeSteps();
}
}
// This promise can be double resolved.
// See: https://github.com/whatwg/streams/issues/1100
reader[_closedPromise].resolve(undefined);
}
/**
* @template R
* @param {ReadableStream} stream
* @returns {void}
*/
function readableStreamDisturb(stream) {
stream[_disturbed] = true;
}
/** @param {ReadableStreamDefaultController} controller */
function readableStreamDefaultControllerCallPullIfNeeded(controller) {
const shouldPull = readableStreamDefaultcontrollerShouldCallPull(
controller,
);
if (shouldPull === false) {
return;
}
if (controller[_pulling] === true) {
controller[_pullAgain] = true;
return;
}
assert(controller[_pullAgain] === false);
controller[_pulling] = true;
const pullPromise = controller[_pullAlgorithm](controller);
uponFulfillment(pullPromise, () => {
controller[_pulling] = false;
if (controller[_pullAgain] === true) {
controller[_pullAgain] = false;
readableStreamDefaultControllerCallPullIfNeeded(controller);
}
});
uponRejection(pullPromise, (e) => {
readableStreamDefaultControllerError(controller, e);
});
}
/**
* @param {ReadableStreamDefaultController} controller
* @returns {boolean}
*/
function readableStreamDefaultControllerCanCloseOrEnqueue(controller) {
const state = controller[_stream][_state];
return controller[_closeRequested] === false && state === "readable";
}
/** @param {ReadableStreamDefaultController} controller */
function readableStreamDefaultControllerClearAlgorithms(controller) {
controller[_pullAlgorithm] = undefined;
controller[_cancelAlgorithm] = undefined;
controller[_strategySizeAlgorithm] = undefined;
}
/** @param {ReadableStreamDefaultController} controller */
function readableStreamDefaultControllerClose(controller) {
if (
readableStreamDefaultControllerCanCloseOrEnqueue(controller) === false
) {
return;
}
const stream = controller[_stream];
controller[_closeRequested] = true;
if (controller[_queue].size === 0) {
readableStreamDefaultControllerClearAlgorithms(controller);
readableStreamClose(stream);
}
}
/**
* @template R
* @param {ReadableStreamDefaultController} controller
* @param {R} chunk
* @returns {void}
*/
function readableStreamDefaultControllerEnqueue(controller, chunk) {
if (
readableStreamDefaultControllerCanCloseOrEnqueue(controller) === false
) {
return;
}
const stream = controller[_stream];
if (
isReadableStreamLocked(stream) === true &&
readableStreamGetNumReadRequests(stream) > 0
) {
readableStreamFulfillReadRequest(stream, chunk, false);
} else {
let chunkSize;
try {
chunkSize = controller[_strategySizeAlgorithm](chunk);
} catch (e) {
readableStreamDefaultControllerError(controller, e);
throw e;
}
try {
enqueueValueWithSize(controller, chunk, chunkSize);
} catch (e) {
readableStreamDefaultControllerError(controller, e);
throw e;
}
}
readableStreamDefaultControllerCallPullIfNeeded(controller);
}
/**
* @param {ReadableStreamDefaultController} controller
* @param {any} e
*/
function readableStreamDefaultControllerError(controller, e) {
const stream = controller[_stream];
if (stream[_state] !== "readable") {
return;
}
resetQueue(controller);
readableStreamDefaultControllerClearAlgorithms(controller);
readableStreamError(stream, e);
}
/**
* @param {ReadableStreamDefaultController} controller
* @returns {number | null}
*/
function readableStreamDefaultControllerGetDesiredSize(controller) {
const state = controller[_stream][_state];
if (state === "errored") {
return null;
}
if (state === "closed") {
return 0;
}
return controller[_strategyHWM] - controller[_queueTotalSize];
}
/** @param {ReadableStreamDefaultController} controller */
function readableStreamDefaultcontrollerHasBackpressure(controller) {
if (readableStreamDefaultcontrollerShouldCallPull(controller) === true) {
return false;
} else {
return true;
}
}
/**
* @param {ReadableStreamDefaultController} controller
* @returns {boolean}
*/
function readableStreamDefaultcontrollerShouldCallPull(controller) {
if (
readableStreamDefaultControllerCanCloseOrEnqueue(controller) === false
) {
return false;
}
if (controller[_started] === false) {
return false;
}
const stream = controller[_stream];
if (
isReadableStreamLocked(stream) &&
readableStreamGetNumReadRequests(stream) > 0
) {
return true;
}
const desiredSize = readableStreamDefaultControllerGetDesiredSize(
controller,
);
if (desiredSize > 0) {
return true;
}
assert(desiredSize !== null);
return false;
}
/**
* @param {ReadableStreamBYOBReader} reader
* @param {ArrayBufferView} view
* @param {ReadIntoRequest} readIntoRequest
* @returns {void}
*/
function readableStreamBYOBReaderRead(reader, view, readIntoRequest) {
const stream = reader[_stream];
assert(stream);
stream[_disturbed] = true;
if (stream[_state] === "errored") {
readIntoRequest.errorSteps(stream[_storedError]);
} else {
readableByteStreamControllerPullInto(
stream[_controller],
view,
readIntoRequest,
);
}
}
/**
* @param {ReadableStreamBYOBReader} reader
*/
function readableStreamBYOBReaderRelease(reader) {
readableStreamReaderGenericRelease(reader);
const e = new TypeError("The reader was released.");
readableStreamBYOBReaderErrorReadIntoRequests(reader, e);
}
/**
* @param {ReadableStreamBYOBReader} reader
* @param {any} e
*/
function readableStreamDefaultReaderErrorReadRequests(reader, e) {
const readRequests = reader[_readRequests];
while (readRequests.size !== 0) {
const readRequest = readRequests.dequeue();
readRequest.errorSteps(e);
}
}
/**
* @param {ReadableByteStreamController} controller
*/
function readableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(
controller,
) {
assert(!controller[_closeRequested]);
while (controller[_pendingPullIntos].length !== 0) {
if (controller[_queueTotalSize] === 0) {
return;
}
const pullIntoDescriptor = controller[_pendingPullIntos][0];
if (
readableByteStreamControllerFillPullIntoDescriptorFromQueue(
controller,
pullIntoDescriptor,
)
) {
readableByteStreamControllerShiftPendingPullInto(controller);
readableByteStreamControllerCommitPullIntoDescriptor(
controller[_stream],
pullIntoDescriptor,
);
}
}
}
/**
* @param {ReadableByteStreamController} controller
*/
function readableByteStreamControllerProcessReadRequestsUsingQueue(
controller,
) {
const reader = controller[_stream][_reader];
assert(isReadableStreamDefaultReader(reader));
while (reader[_readRequests].size !== 0) {
if (controller[_queueTotalSize] === 0) {
return;
}
const readRequest = reader[_readRequests].dequeue();
readableByteStreamControllerFillReadRequestFromQueue(
controller,
readRequest,
);
}
}
/**
* @param {ReadableByteStreamController} controller
* @param {ArrayBufferView} view
* @param {ReadIntoRequest} readIntoRequest
* @returns {void}
*/
function readableByteStreamControllerPullInto(
controller,
view,
readIntoRequest,
) {
const stream = controller[_stream];
let ctor;
/** @type {number} */
let elementSize;
/** @type {ArrayBufferLike} */
let buffer;
/** @type {number} */
let byteLength;
/** @type {number} */
let byteOffset;
const tag = TypedArrayPrototypeGetSymbolToStringTag(view);
if (tag === undefined) {
ctor = DataView;
elementSize = 1;
buffer = DataViewPrototypeGetBuffer(/** @type {DataView} */ (view));
byteLength = DataViewPrototypeGetByteLength(/** @type {DataView} */ (view));
byteOffset = DataViewPrototypeGetByteOffset(/** @type {DataView} */ (view));
} else {
switch (tag) {
case "Int8Array":
ctor = Int8Array;
break;
case "Uint8Array":
ctor = Uint8Array;
break;
case "Uint8ClampedArray":
ctor = Uint8ClampedArray;
break;
case "Int16Array":
ctor = Int16Array;
break;
case "Uint16Array":
ctor = Uint16Array;
break;
case "Int32Array":
ctor = Int32Array;
break;
case "Uint32Array":
ctor = Uint32Array;
break;
case "Float32Array":
ctor = Float32Array;
break;
case "Float64Array":
ctor = Float64Array;
break;
case "BigInt64Array":
ctor = BigInt64Array;
break;
case "BigUint64Array":
ctor = BigUint64Array;
break;
default:
throw new TypeError("unreachable");
}
elementSize = ctor.BYTES_PER_ELEMENT;
buffer = TypedArrayPrototypeGetBuffer(/** @type {Uint8Array} */ (view));
byteLength = TypedArrayPrototypeGetByteLength(
/** @type {Uint8Array} */ (view),
);
byteOffset = TypedArrayPrototypeGetByteOffset(
/** @type {Uint8Array} */ (view),
);
}
try {
buffer = transferArrayBuffer(buffer);
} catch (e) {
readIntoRequest.errorSteps(e);
return;
}
/** @type {PullIntoDescriptor} */
const pullIntoDescriptor = {
buffer,
bufferByteLength: getArrayBufferByteLength(buffer),
byteOffset,
byteLength,
bytesFilled: 0,
elementSize,
viewConstructor: ctor,
readerType: "byob",
};
if (controller[_pendingPullIntos].length !== 0) {
ArrayPrototypePush(controller[_pendingPullIntos], pullIntoDescriptor);
readableStreamAddReadIntoRequest(stream, readIntoRequest);
return;
}
if (stream[_state] === "closed") {
const emptyView = new ctor(
// deno-lint-ignore prefer-primordials
pullIntoDescriptor.buffer,
// deno-lint-ignore prefer-primordials
pullIntoDescriptor.byteOffset,
0,
);
readIntoRequest.closeSteps(emptyView);
return;
}
if (controller[_queueTotalSize] > 0) {
if (
readableByteStreamControllerFillPullIntoDescriptorFromQueue(
controller,
pullIntoDescriptor,
)
) {
const filledView = readableByteStreamControllerConvertPullIntoDescriptor(
pullIntoDescriptor,
);
readableByteStreamControllerHandleQueueDrain(controller);
readIntoRequest.chunkSteps(filledView);
return;
}
if (controller[_closeRequested]) {
const e = new TypeError(
"Insufficient bytes to fill elements in the given buffer",
);
readableByteStreamControllerError(controller, e);
readIntoRequest.errorSteps(e);
return;
}
}
ArrayPrototypePush(controller[_pendingPullIntos], pullIntoDescriptor);
readableStreamAddReadIntoRequest(stream, readIntoRequest);
readableByteStreamControllerCallPullIfNeeded(controller);
}
/**
* @param {ReadableByteStreamController} controller
* @param {number} bytesWritten
* @returns {void}
*/
function readableByteStreamControllerRespond(controller, bytesWritten) {
assert(controller[_pendingPullIntos].length !== 0);
const firstDescriptor = controller[_pendingPullIntos][0];
const state = controller[_stream][_state];
if (state === "closed") {
if (bytesWritten !== 0) {
throw new TypeError(
"bytesWritten must be 0 when calling respond() on a closed stream",
);
}
} else {
assert(state === "readable");
if (bytesWritten === 0) {
throw new TypeError(
"bytesWritten must be greater than 0 when calling respond() on a readable stream",
);
}
if (
(firstDescriptor.bytesFilled + bytesWritten) >
// deno-lint-ignore prefer-primordials
firstDescriptor.byteLength
) {
throw new RangeError("bytesWritten out of range");
}
}
// deno-lint-ignore prefer-primordials
firstDescriptor.buffer = transferArrayBuffer(firstDescriptor.buffer);
readableByteStreamControllerRespondInternal(controller, bytesWritten);
}
/**
* @param {ReadableByteStreamController} controller
* @param {number} bytesWritten
* @param {PullIntoDescriptor} pullIntoDescriptor
* @returns {void}
*/
function readableByteStreamControllerRespondInReadableState(
controller,
bytesWritten,
pullIntoDescriptor,
) {
assert(
(pullIntoDescriptor.bytesFilled + bytesWritten) <=
// deno-lint-ignore prefer-primordials
pullIntoDescriptor.byteLength,
);
readableByteStreamControllerFillHeadPullIntoDescriptor(
controller,
bytesWritten,
pullIntoDescriptor,
);
if (pullIntoDescriptor.readerType === "none") {
readableByteStreamControllerEnqueueDetachedPullIntoToQueue(
controller,
pullIntoDescriptor,
);
readableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(
controller,
);
return;
}
if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
return;
}
readableByteStreamControllerShiftPendingPullInto(controller);
const remainderSize = pullIntoDescriptor.bytesFilled %
pullIntoDescriptor.elementSize;
if (remainderSize > 0) {
// deno-lint-ignore prefer-primordials
const end = pullIntoDescriptor.byteOffset +
pullIntoDescriptor.bytesFilled;
readableByteStreamControllerEnqueueClonedChunkToQueue(
controller,
// deno-lint-ignore prefer-primordials
pullIntoDescriptor.buffer,
end - remainderSize,
remainderSize,
);
}
pullIntoDescriptor.bytesFilled -= remainderSize;
readableByteStreamControllerCommitPullIntoDescriptor(
controller[_stream],
pullIntoDescriptor,
);
readableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(
controller,
);
}
/**
* @param {ReadableByteStreamController} controller
* @param {number} bytesWritten
* @returns {void}
*/
function readableByteStreamControllerRespondInternal(
controller,
bytesWritten,
) {
const firstDescriptor = controller[_pendingPullIntos][0];
// deno-lint-ignore prefer-primordials
assert(canTransferArrayBuffer(firstDescriptor.buffer));
readableByteStreamControllerInvalidateBYOBRequest(controller);
const state = controller[_stream][_state];
if (state === "closed") {
assert(bytesWritten === 0);
readableByteStreamControllerRespondInClosedState(
controller,
firstDescriptor,
);
} else {
assert(state === "readable");
assert(bytesWritten > 0);
readableByteStreamControllerRespondInReadableState(
controller,
bytesWritten,
firstDescriptor,
);
}
readableByteStreamControllerCallPullIfNeeded(controller);
}
/**
* @param {ReadableByteStreamController} controller
*/
function readableByteStreamControllerInvalidateBYOBRequest(controller) {
if (controller[_byobRequest] === null) {
return;
}
controller[_byobRequest][_controller] = undefined;
controller[_byobRequest][_view] = null;
controller[_byobRequest] = null;
}
/**
* @param {ReadableByteStreamController} controller
* @param {PullIntoDescriptor} firstDescriptor
*/
function readableByteStreamControllerRespondInClosedState(
controller,
firstDescriptor,
) {
assert(firstDescriptor.bytesFilled === 0);
if (firstDescriptor.readerType === "none") {
readableByteStreamControllerShiftPendingPullInto(controller);
}
const stream = controller[_stream];
if (readableStreamHasBYOBReader(stream)) {
while (readableStreamGetNumReadIntoRequests(stream) > 0) {
const pullIntoDescriptor =
readableByteStreamControllerShiftPendingPullInto(controller);
readableByteStreamControllerCommitPullIntoDescriptor(
stream,
pullIntoDescriptor,
);
}
}
}
/**
* @template R
* @param {ReadableStream} stream
* @param {PullIntoDescriptor} pullIntoDescriptor
*/
function readableByteStreamControllerCommitPullIntoDescriptor(
stream,
pullIntoDescriptor,
) {
assert(stream[_state] !== "errored");
assert(pullIntoDescriptor.readerType !== "none");
let done = false;
if (stream[_state] === "closed") {
assert(pullIntoDescriptor.bytesFilled === 0);
done = true;
}
const filledView = readableByteStreamControllerConvertPullIntoDescriptor(
pullIntoDescriptor,
);
if (pullIntoDescriptor.readerType === "default") {
readableStreamFulfillReadRequest(stream, filledView, done);
} else {
assert(pullIntoDescriptor.readerType === "byob");
readableStreamFulfillReadIntoRequest(stream, filledView, done);
}
}
/**
* @param {ReadableByteStreamController} controller
* @param {ArrayBufferView} view
*/
function readableByteStreamControllerRespondWithNewView(controller, view) {
assert(controller[_pendingPullIntos].length !== 0);
let buffer, byteLength, byteOffset;
if (TypedArrayPrototypeGetSymbolToStringTag(view) === undefined) {
buffer = DataViewPrototypeGetBuffer(/** @type {DataView} */ (view));
byteLength = DataViewPrototypeGetByteLength(/** @type {DataView} */ (view));
byteOffset = DataViewPrototypeGetByteOffset(/** @type {DataView} */ (view));
} else {
buffer = TypedArrayPrototypeGetBuffer(/** @type {Uint8Array}} */ (view));
byteLength = TypedArrayPrototypeGetByteLength(
/** @type {Uint8Array} */ (view),
);
byteOffset = TypedArrayPrototypeGetByteOffset(
/** @type {Uint8Array} */ (view),
);
}
assert(!isDetachedBuffer(buffer));
const firstDescriptor = controller[_pendingPullIntos][0];
const state = controller[_stream][_state];
if (state === "closed") {
if (byteLength !== 0) {
throw new TypeError(
"The view's length must be 0 when calling respondWithNewView() on a closed stream",
);
}
} else {
assert(state === "readable");
if (byteLength === 0) {
throw new TypeError(
"The view's length must be greater than 0 when calling respondWithNewView() on a readable stream",
);
}
}
// deno-lint-ignore prefer-primordials
if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== byteOffset) {
throw new RangeError(
"The region specified by view does not match byobRequest",
);
}
if (firstDescriptor.bufferByteLength !== getArrayBufferByteLength(buffer)) {
throw new RangeError(
"The buffer of view has different capacity than byobRequest",
);
}
// deno-lint-ignore prefer-primordials
if (firstDescriptor.bytesFilled + byteLength > firstDescriptor.byteLength) {
throw new RangeError(
"The region specified by view is larger than byobRequest",
);
}
firstDescriptor.buffer = transferArrayBuffer(buffer);
readableByteStreamControllerRespondInternal(controller, byteLength);
}
/**
* @param {ReadableByteStreamController} controller
* @returns {PullIntoDescriptor}
*/
function readableByteStreamControllerShiftPendingPullInto(controller) {
assert(controller[_byobRequest] === null);
return ArrayPrototypeShift(controller[_pendingPullIntos]);
}
/**
* @param {ReadableByteStreamController} controller
* @param {PullIntoDescriptor} pullIntoDescriptor
* @returns {boolean}
*/
function readableByteStreamControllerFillPullIntoDescriptorFromQueue(
controller,
pullIntoDescriptor,
) {
const elementSize = pullIntoDescriptor.elementSize;
const currentAlignedBytes = pullIntoDescriptor.bytesFilled -
(pullIntoDescriptor.bytesFilled % elementSize);
const maxBytesToCopy = MathMin(
controller[_queueTotalSize],
// deno-lint-ignore prefer-primordials
pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled,
);
const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
const maxAlignedBytes = maxBytesFilled - (maxBytesFilled % elementSize);
let totalBytesToCopyRemaining = maxBytesToCopy;
let ready = false;
if (maxAlignedBytes > currentAlignedBytes) {
totalBytesToCopyRemaining = maxAlignedBytes -
pullIntoDescriptor.bytesFilled;
ready = true;
}
const queue = controller[_queue];
while (totalBytesToCopyRemaining > 0) {
const headOfQueue = queue.peek();
const bytesToCopy = MathMin(
totalBytesToCopyRemaining,
// deno-lint-ignore prefer-primordials
headOfQueue.byteLength,
);
// deno-lint-ignore prefer-primordials
const destStart = pullIntoDescriptor.byteOffset +
pullIntoDescriptor.bytesFilled;
const destBuffer = new Uint8Array(
// deno-lint-ignore prefer-primordials
pullIntoDescriptor.buffer,
destStart,
bytesToCopy,
);
const srcBuffer = new Uint8Array(
// deno-lint-ignore prefer-primordials
headOfQueue.buffer,
// deno-lint-ignore prefer-primordials
headOfQueue.byteOffset,
bytesToCopy,
);
destBuffer.set(srcBuffer);
// deno-lint-ignore prefer-primordials
if (headOfQueue.byteLength === bytesToCopy) {
queue.dequeue();
} else {
headOfQueue.byteOffset += bytesToCopy;
headOfQueue.byteLength -= bytesToCopy;
}
controller[_queueTotalSize] -= bytesToCopy;
readableByteStreamControllerFillHeadPullIntoDescriptor(
controller,
bytesToCopy,
pullIntoDescriptor,
);
totalBytesToCopyRemaining -= bytesToCopy;
}
if (!ready) {
assert(controller[_queueTotalSize] === 0);
assert(pullIntoDescriptor.bytesFilled > 0);
assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);
}
return ready;
}
/**
* @param {ReadableByteStreamController} controller
* @param {ReadRequest} readRequest
* @returns {void}
*/
function readableByteStreamControllerFillReadRequestFromQueue(
controller,
readRequest,
) {
assert(controller[_queueTotalSize] > 0);
const entry = controller[_queue].dequeue();
// deno-lint-ignore prefer-primordials
controller[_queueTotalSize] -= entry.byteLength;
readableByteStreamControllerHandleQueueDrain(controller);
const view = new Uint8Array(
// deno-lint-ignore prefer-primordials
entry.buffer,
// deno-lint-ignore prefer-primordials
entry.byteOffset,
// deno-lint-ignore prefer-primordials
entry.byteLength,
);
readRequest.chunkSteps(view);
}
/**
* @param {ReadableByteStreamController} controller
* @param {number} size
* @param {PullIntoDescriptor} pullIntoDescriptor
* @returns {void}
*/
function readableByteStreamControllerFillHeadPullIntoDescriptor(
controller,
size,
pullIntoDescriptor,
) {
assert(
controller[_pendingPullIntos].length === 0 ||
controller[_pendingPullIntos][0] === pullIntoDescriptor,
);
assert(controller[_byobRequest] === null);
pullIntoDescriptor.bytesFilled += size;
}
/**
* @param {PullIntoDescriptor} pullIntoDescriptor
* @returns {ArrayBufferView}
*/
function readableByteStreamControllerConvertPullIntoDescriptor(
pullIntoDescriptor,
) {
const bytesFilled = pullIntoDescriptor.bytesFilled;
const elementSize = pullIntoDescriptor.elementSize;
// deno-lint-ignore prefer-primordials
assert(bytesFilled <= pullIntoDescriptor.byteLength);
assert((bytesFilled % elementSize) === 0);
// deno-lint-ignore prefer-primordials
const buffer = transferArrayBuffer(pullIntoDescriptor.buffer);
return new pullIntoDescriptor.viewConstructor(
buffer,
// deno-lint-ignore prefer-primordials
pullIntoDescriptor.byteOffset,
bytesFilled / elementSize,
);
}
/**
* @template R
* @param {ReadableStreamDefaultReader} reader
* @param {ReadRequest} readRequest
* @returns {void}
*/
function readableStreamDefaultReaderRead(reader, readRequest) {
const stream = reader[_stream];
assert(stream);
stream[_disturbed] = true;
if (stream[_state] === "closed") {
readRequest.closeSteps();
} else if (stream[_state] === "errored") {
readRequest.errorSteps(stream[_storedError]);
} else {
assert(stream[_state] === "readable");
stream[_controller][_pullSteps](readRequest);
}
}
/**
* @template R
* @param {ReadableStreamDefaultReader} reader
*/
function readableStreamDefaultReaderRelease(reader) {
readableStreamReaderGenericRelease(reader);
const e = new TypeError("The reader was released.");
readableStreamDefaultReaderErrorReadRequests(reader, e);
}
/**
* @template R
* @param {ReadableStream} stream
* @param {any} e
*/
function readableStreamError(stream, e) {
assert(stream[_state] === "readable");
stream[_state] = "errored";
stream[_storedError] = e;
/** @type {ReadableStreamDefaultReader | undefined} */
const reader = stream[_reader];
if (reader === undefined) {
return;
}
/** @type {Deferred} */
const closedPromise = reader[_closedPromise];
closedPromise.reject(e);
setPromiseIsHandledToTrue(closedPromise.promise);
if (isReadableStreamDefaultReader(reader)) {
readableStreamDefaultReaderErrorReadRequests(reader, e);
} else {
assert(isReadableStreamBYOBReader(reader));
readableStreamBYOBReaderErrorReadIntoRequests(reader, e);
}
}
/**
* @template R
* @param {ReadableStream} stream
* @param {R} chunk
* @param {boolean} done
*/
function readableStreamFulfillReadIntoRequest(stream, chunk, done) {
assert(readableStreamHasBYOBReader(stream));
/** @type {ReadableStreamDefaultReader} */
const reader = stream[_reader];
assert(reader[_readIntoRequests].length !== 0);
/** @type {ReadIntoRequest} */
const readIntoRequest = ArrayPrototypeShift(reader[_readIntoRequests]);
if (done) {
readIntoRequest.closeSteps(chunk);
} else {
readIntoRequest.chunkSteps(chunk);
}
}
/**
* @template R
* @param {ReadableStream} stream
* @param {R} chunk
* @param {boolean} done
*/
function readableStreamFulfillReadRequest(stream, chunk, done) {
assert(readableStreamHasDefaultReader(stream) === true);
/** @type {ReadableStreamDefaultReader} */
const reader = stream[_reader];
assert(reader[_readRequests].size);
/** @type {ReadRequest} */
const readRequest = reader[_readRequests].dequeue();
if (done) {
readRequest.closeSteps();
} else {
readRequest.chunkSteps(chunk);
}
}
/**
* @param {ReadableStream} stream
* @return {number}
*/
function readableStreamGetNumReadIntoRequests(stream) {
assert(readableStreamHasBYOBReader(stream) === true);
return stream[_reader][_readIntoRequests].length;
}
/**
* @param {ReadableStream} stream
* @return {number}
*/
function readableStreamGetNumReadRequests(stream) {
assert(readableStreamHasDefaultReader(stream) === true);
return stream[_reader][_readRequests].size;
}
/**
* @param {ReadableStream} stream
* @returns {boolean}
*/
function readableStreamHasBYOBReader(stream) {
const reader = stream[_reader];
if (reader === undefined) {
return false;
}
if (isReadableStreamBYOBReader(reader)) {
return true;
}
return false;
}
/**
* @param {ReadableStream} stream
* @returns {boolean}
*/
function readableStreamHasDefaultReader(stream) {
const reader = stream[_reader];
if (reader === undefined) {
return false;
}
if (isReadableStreamDefaultReader(reader)) {
return true;
}
return false;
}
/**
* @template T
* @param {ReadableStream} source
* @param {WritableStream} dest
* @param {boolean} preventClose
* @param {boolean} preventAbort
* @param {boolean} preventCancel
* @param {AbortSignal=} signal
* @returns {Promise}
*/
function readableStreamPipeTo(
source,
dest,
preventClose,
preventAbort,
preventCancel,
signal,
) {
assert(isReadableStream(source));
assert(isWritableStream(dest));
assert(
typeof preventClose === "boolean" && typeof preventAbort === "boolean" &&
typeof preventCancel === "boolean",
);
assert(
signal === undefined ||
ObjectPrototypeIsPrototypeOf(AbortSignalPrototype, signal),
);
assert(!isReadableStreamLocked(source));
assert(!isWritableStreamLocked(dest));
// We use acquireReadableStreamDefaultReader even in case of ReadableByteStreamController
// as the spec allows us, and the only reason to use BYOBReader is to do some smart things
// with it, but the spec does not specify what things, so to simplify we stick to DefaultReader.
const reader = acquireReadableStreamDefaultReader(source);
const writer = acquireWritableStreamDefaultWriter(dest);
source[_disturbed] = true;
let shuttingDown = false;
let currentWrite = PromiseResolve(undefined);
/** @type {Deferred} */
const promise = new Deferred();
/** @type {() => void} */
let abortAlgorithm;
if (signal) {
abortAlgorithm = () => {
const error = signal.reason;
/** @type {Array<() => Promise>} */
const actions = [];
if (preventAbort === false) {
ArrayPrototypePush(actions, () => {
if (dest[_state] === "writable") {
return writableStreamAbort(dest, error);
} else {
return PromiseResolve(undefined);
}
});
}
if (preventCancel === false) {
ArrayPrototypePush(actions, () => {
if (source[_state] === "readable") {
return readableStreamCancel(source, error);
} else {
return PromiseResolve(undefined);
}
});
}
shutdownWithAction(
() => SafePromiseAll(ArrayPrototypeMap(actions, (action) => action())),
true,
error,
);
};
if (signal.aborted) {
abortAlgorithm();
return promise.promise;
}
signal[add](abortAlgorithm);
}
function pipeLoop() {
return new Promise((resolveLoop, rejectLoop) => {
/** @param {boolean} done */
function next(done) {
if (done) {
resolveLoop();
} else {
uponPromise(pipeStep(), next, rejectLoop);
}
}
next(false);
});
}
/** @returns {Promise} */
function pipeStep() {
if (shuttingDown === true) {
return PromiseResolve(true);
}
return transformPromiseWith(writer[_readyPromise].promise, () => {
return new Promise((resolveRead, rejectRead) => {
readableStreamDefaultReaderRead(
reader,
{
chunkSteps(chunk) {
currentWrite = transformPromiseWith(
writableStreamDefaultWriterWrite(writer, chunk),
undefined,
() => {},
);
resolveRead(false);
},
closeSteps() {
resolveRead(true);
},
errorSteps: rejectRead,
},
);
});
});
}
isOrBecomesErrored(
source,
reader[_closedPromise].promise,
(storedError) => {
if (preventAbort === false) {
shutdownWithAction(
() => writableStreamAbort(dest, storedError),
true,
storedError,
);
} else {
shutdown(true, storedError);
}
},
);
isOrBecomesErrored(dest, writer[_closedPromise].promise, (storedError) => {
if (preventCancel === false) {
shutdownWithAction(
() => readableStreamCancel(source, storedError),
true,
storedError,
);
} else {
shutdown(true, storedError);
}
});
isOrBecomesClosed(source, reader[_closedPromise].promise, () => {
if (preventClose === false) {
shutdownWithAction(() =>
writableStreamDefaultWriterCloseWithErrorPropagation(writer)
);
} else {
shutdown();
}
});
if (
writableStreamCloseQueuedOrInFlight(dest) === true ||
dest[_state] === "closed"
) {
const destClosed = new TypeError(
"The destination writable stream closed before all the data could be piped to it.",
);
if (preventCancel === false) {
shutdownWithAction(
() => readableStreamCancel(source, destClosed),
true,
destClosed,
);
} else {
shutdown(true, destClosed);
}
}
setPromiseIsHandledToTrue(pipeLoop());
return promise.promise;
/** @returns {Promise} */
function waitForWritesToFinish() {
const oldCurrentWrite = currentWrite;
return transformPromiseWith(
currentWrite,
() =>
oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined,
);
}
/**
* @param {ReadableStream | WritableStream} stream
* @param {Promise} promise
* @param {(e: any) => void} action
*/
function isOrBecomesErrored(stream, promise, action) {
if (stream[_state] === "errored") {
action(stream[_storedError]);
} else {
uponRejection(promise, action);
}
}
/**
* @param {ReadableStream} stream
* @param {Promise} promise
* @param {() => void} action
*/
function isOrBecomesClosed(stream, promise, action) {
if (stream[_state] === "closed") {
action();
} else {
uponFulfillment(promise, action);
}
}
/**
* @param {() => Promise} action
* @param {boolean=} originalIsError
* @param {any=} originalError
*/
function shutdownWithAction(action, originalIsError, originalError) {
function doTheRest() {
uponPromise(
action(),
() => finalize(originalIsError, originalError),
(newError) => finalize(true, newError),
);
}
if (shuttingDown === true) {
return;
}
shuttingDown = true;
if (
dest[_state] === "writable" &&
writableStreamCloseQueuedOrInFlight(dest) === false
) {
uponFulfillment(waitForWritesToFinish(), doTheRest);
} else {
doTheRest();
}
}
/**
* @param {boolean=} isError
* @param {any=} error
*/
function shutdown(isError, error) {
if (shuttingDown) {
return;
}
shuttingDown = true;
if (
dest[_state] === "writable" &&
writableStreamCloseQueuedOrInFlight(dest) === false
) {
uponFulfillment(
waitForWritesToFinish(),
() => finalize(isError, error),
);
} else {
finalize(isError, error);
}
}
/**
* @param {boolean=} isError
* @param {any=} error
*/
function finalize(isError, error) {
writableStreamDefaultWriterRelease(writer);
readableStreamDefaultReaderRelease(reader);
if (signal !== undefined) {
signal[remove](abortAlgorithm);
}
if (isError) {
promise.reject(error);
} else {
promise.resolve(undefined);
}
}
}
/**
* @param {ReadableStreamGenericReader | ReadableStreamBYOBReader} reader
* @param {any} reason
* @returns {Promise}
*/
function readableStreamReaderGenericCancel(reader, reason) {
const stream = reader[_stream];
assert(stream !== undefined);
return readableStreamCancel(stream, reason);
}
/**
* @template R
* @param {ReadableStreamDefaultReader | ReadableStreamBYOBReader} reader
* @param {ReadableStream} stream
*/
function readableStreamReaderGenericInitialize(reader, stream) {
reader[_stream] = stream;
stream[_reader] = reader;
if (stream[_state] === "readable") {
reader[_closedPromise] = new Deferred();
} else if (stream[_state] === "closed") {
reader[_closedPromise] = new Deferred();
reader[_closedPromise].resolve(undefined);
} else {
assert(stream[_state] === "errored");
reader[_closedPromise] = new Deferred();
reader[_closedPromise].reject(stream[_storedError]);
setPromiseIsHandledToTrue(reader[_closedPromise].promise);
}
}
/**
* @template R
* @param {ReadableStreamGenericReader | ReadableStreamBYOBReader} reader
*/
function readableStreamReaderGenericRelease(reader) {
const stream = reader[_stream];
assert(stream !== undefined);
assert(stream[_reader] === reader);
if (stream[_state] === "readable") {
reader[_closedPromise].reject(
new TypeError(
"Reader was released and can no longer be used to monitor the stream's closedness.",
),
);
} else {
reader[_closedPromise] = new Deferred();
reader[_closedPromise].reject(
new TypeError(
"Reader was released and can no longer be used to monitor the stream's closedness.",
),
);
}
setPromiseIsHandledToTrue(reader[_closedPromise].promise);
stream[_controller][_releaseSteps]();
stream[_reader] = undefined;
reader[_stream] = undefined;
}
/**
* @param {ReadableStreamBYOBReader} reader
* @param {any} e
*/
function readableStreamBYOBReaderErrorReadIntoRequests(reader, e) {
const readIntoRequests = reader[_readIntoRequests];
reader[_readIntoRequests] = [];
for (let i = 0; i < readIntoRequests.length; ++i) {
const readIntoRequest = readIntoRequests[i];
readIntoRequest.errorSteps(e);
}
}
/**
* @template R
* @param {ReadableStream} stream
* @param {boolean} cloneForBranch2
* @returns {[ReadableStream, ReadableStream]}
*/
function readableStreamTee(stream, cloneForBranch2) {
assert(isReadableStream(stream));
assert(typeof cloneForBranch2 === "boolean");
if (
ObjectPrototypeIsPrototypeOf(
ReadableByteStreamControllerPrototype,
stream[_controller],
)
) {
return readableByteStreamTee(stream);
} else {
return readableStreamDefaultTee(stream, cloneForBranch2);
}
}
/**
* @template R
* @param {ReadableStream} stream
* @param {boolean} cloneForBranch2
* @returns {[ReadableStream, ReadableStream]}
*/
function readableStreamDefaultTee(stream, cloneForBranch2) {
assert(isReadableStream(stream));
assert(typeof cloneForBranch2 === "boolean");
const reader = acquireReadableStreamDefaultReader(stream);
let reading = false;
let readAgain = false;
let canceled1 = false;
let canceled2 = false;
/** @type {any} */
let reason1;
/** @type {any} */
let reason2;
/** @type {ReadableStream} */
// deno-lint-ignore prefer-const
let branch1;
/** @type {ReadableStream} */
// deno-lint-ignore prefer-const
let branch2;
/** @type {Deferred} */
const cancelPromise = new Deferred();
function pullAlgorithm() {
if (reading === true) {
readAgain = true;
return PromiseResolve(undefined);
}
reading = true;
/** @type {ReadRequest} */
const readRequest = {
chunkSteps(value) {
queueMicrotask(() => {
readAgain = false;
const value1 = value;
let value2 = value;
if (canceled2 === false && cloneForBranch2 === true) {
try {
value2 = structuredClone(value2);
} catch (cloneError) {
readableStreamDefaultControllerError(
branch1[_controller],
cloneError,
);
readableStreamDefaultControllerError(
branch2[_controller],
cloneError,
);
cancelPromise.resolve(readableStreamCancel(stream, cloneError));
return;
}
}
if (canceled1 === false) {
readableStreamDefaultControllerEnqueue(
/** @type {ReadableStreamDefaultController} */ branch1[
_controller
],
value1,
);
}
if (canceled2 === false) {
readableStreamDefaultControllerEnqueue(
/** @type {ReadableStreamDefaultController} */ branch2[
_controller
],
value2,
);
}
reading = false;
if (readAgain === true) {
pullAlgorithm();
}
});
},
closeSteps() {
reading = false;
if (canceled1 === false) {
readableStreamDefaultControllerClose(
/** @type {ReadableStreamDefaultController} */ branch1[
_controller
],
);
}
if (canceled2 === false) {
readableStreamDefaultControllerClose(
/** @type {ReadableStreamDefaultController} */ branch2[
_controller
],
);
}
if (canceled1 === false || canceled2 === false) {
cancelPromise.resolve(undefined);
}
},
errorSteps() {
reading = false;
},
};
readableStreamDefaultReaderRead(reader, readRequest);
return PromiseResolve(undefined);
}
/**
* @param {any} reason
* @returns {Promise}
*/
function cancel1Algorithm(reason) {
canceled1 = true;
reason1 = reason;
if (canceled2 === true) {
const compositeReason = [reason1, reason2];
const cancelResult = readableStreamCancel(stream, compositeReason);
cancelPromise.resolve(cancelResult);
}
return cancelPromise.promise;
}
/**
* @param {any} reason
* @returns {Promise}
*/
function cancel2Algorithm(reason) {
canceled2 = true;
reason2 = reason;
if (canceled1 === true) {
const compositeReason = [reason1, reason2];
const cancelResult = readableStreamCancel(stream, compositeReason);
cancelPromise.resolve(cancelResult);
}
return cancelPromise.promise;
}
function startAlgorithm() {}
branch1 = createReadableStream(
startAlgorithm,
pullAlgorithm,
cancel1Algorithm,
);
branch2 = createReadableStream(
startAlgorithm,
pullAlgorithm,
cancel2Algorithm,
);
uponRejection(reader[_closedPromise].promise, (r) => {
readableStreamDefaultControllerError(
/** @type {ReadableStreamDefaultController} */ branch1[
_controller
],
r,
);
readableStreamDefaultControllerError(
/** @type {ReadableStreamDefaultController} */ branch2[
_controller
],
r,
);
if (canceled1 === false || canceled2 === false) {
cancelPromise.resolve(undefined);
}
});
return [branch1, branch2];
}
/**
* @template R
* @param {ReadableStream} stream
* @returns {[ReadableStream, ReadableStream]}
*/
function readableByteStreamTee(stream) {
assert(isReadableStream(stream));
assert(
ObjectPrototypeIsPrototypeOf(
ReadableByteStreamControllerPrototype,
stream[_controller],
),
);
let reader = acquireReadableStreamDefaultReader(stream);
let reading = false;
let readAgainForBranch1 = false;
let readAgainForBranch2 = false;
let canceled1 = false;
let canceled2 = false;
let reason1 = undefined;
let reason2 = undefined;
let branch1 = undefined;
let branch2 = undefined;
/** @type {Deferred} */
const cancelPromise = new Deferred();
/**
* @param {ReadableStreamBYOBReader} thisReader
*/
function forwardReaderError(thisReader) {
PromisePrototypeCatch(thisReader[_closedPromise].promise, (e) => {
if (thisReader !== reader) {
return;
}
readableByteStreamControllerError(branch1[_controller], e);
readableByteStreamControllerError(branch2[_controller], e);
if (!canceled1 || !canceled2) {
cancelPromise.resolve(undefined);
}
});
}
function pullWithDefaultReader() {
if (isReadableStreamBYOBReader(reader)) {
assert(reader[_readIntoRequests].length === 0);
readableStreamBYOBReaderRelease(reader);
reader = acquireReadableStreamDefaultReader(stream);
forwardReaderError(reader);
}
/** @type {ReadRequest} */
const readRequest = {
chunkSteps(chunk) {
queueMicrotask(() => {
readAgainForBranch1 = false;
readAgainForBranch2 = false;
const chunk1 = chunk;
let chunk2 = chunk;
if (!canceled1 && !canceled2) {
try {
chunk2 = cloneAsUint8Array(chunk);
} catch (e) {
readableByteStreamControllerError(branch1[_controller], e);
readableByteStreamControllerError(branch2[_controller], e);
cancelPromise.resolve(readableStreamCancel(stream, e));
return;
}
}
if (!canceled1) {
readableByteStreamControllerEnqueue(branch1[_controller], chunk1);
}
if (!canceled2) {
readableByteStreamControllerEnqueue(branch2[_controller], chunk2);
}
reading = false;
if (readAgainForBranch1) {
pull1Algorithm();
} else if (readAgainForBranch2) {
pull2Algorithm();
}
});
},
closeSteps() {
reading = false;
if (!canceled1) {
readableByteStreamControllerClose(branch1[_controller]);
}
if (!canceled2) {
readableByteStreamControllerClose(branch2[_controller]);
}
if (branch1[_controller][_pendingPullIntos].length !== 0) {
readableByteStreamControllerRespond(branch1[_controller], 0);
}
if (branch2[_controller][_pendingPullIntos].length !== 0) {
readableByteStreamControllerRespond(branch2[_controller], 0);
}
if (!canceled1 || !canceled2) {
cancelPromise.resolve(undefined);
}
},
errorSteps() {
reading = false;
},
};
readableStreamDefaultReaderRead(reader, readRequest);
}
function pullWithBYOBReader(view, forBranch2) {
if (isReadableStreamDefaultReader(reader)) {
assert(reader[_readRequests].size === 0);
readableStreamDefaultReaderRelease(reader);
reader = acquireReadableStreamBYOBReader(stream);
forwardReaderError(reader);
}
const byobBranch = forBranch2 ? branch2 : branch1;
const otherBranch = forBranch2 ? branch1 : branch2;
/** @type {ReadIntoRequest} */
const readIntoRequest = {
chunkSteps(chunk) {
queueMicrotask(() => {
readAgainForBranch1 = false;
readAgainForBranch2 = false;
const byobCanceled = forBranch2 ? canceled2 : canceled1;
const otherCanceled = forBranch2 ? canceled1 : canceled2;
if (!otherCanceled) {
let clonedChunk;
try {
clonedChunk = cloneAsUint8Array(chunk);
} catch (e) {
readableByteStreamControllerError(byobBranch[_controller], e);
readableByteStreamControllerError(otherBranch[_controller], e);
cancelPromise.resolve(readableStreamCancel(stream, e));
return;
}
if (!byobCanceled) {
readableByteStreamControllerRespondWithNewView(
byobBranch[_controller],
chunk,
);
}
readableByteStreamControllerEnqueue(
otherBranch[_controller],
clonedChunk,
);
} else if (!byobCanceled) {
readableByteStreamControllerRespondWithNewView(
byobBranch[_controller],
chunk,
);
}
reading = false;
if (readAgainForBranch1) {
pull1Algorithm();
} else if (readAgainForBranch2) {
pull2Algorithm();
}
});
},
closeSteps(chunk) {
reading = false;
const byobCanceled = forBranch2 ? canceled2 : canceled1;
const otherCanceled = forBranch2 ? canceled1 : canceled2;
if (!byobCanceled) {
readableByteStreamControllerClose(byobBranch[_controller]);
}
if (!otherCanceled) {
readableByteStreamControllerClose(otherBranch[_controller]);
}
if (chunk !== undefined) {
let byteLength;
if (TypedArrayPrototypeGetSymbolToStringTag(chunk) === undefined) {
byteLength = DataViewPrototypeGetByteLength(
/** @type {DataView} */ (chunk),
);
} else {
byteLength = TypedArrayPrototypeGetByteLength(
/** @type {Uint8Array} */ (chunk),
);
}
assert(byteLength === 0);
if (!byobCanceled) {
readableByteStreamControllerRespondWithNewView(
byobBranch[_controller],
chunk,
);
}
if (
!otherCanceled &&
otherBranch[_controller][_pendingPullIntos].length !== 0
) {
readableByteStreamControllerRespond(otherBranch[_controller], 0);
}
}
if (!byobCanceled || !otherCanceled) {
cancelPromise.resolve(undefined);
}
},
errorSteps() {
reading = false;
},
};
readableStreamBYOBReaderRead(reader, view, readIntoRequest);
}
function pull1Algorithm() {
if (reading) {
readAgainForBranch1 = true;
return PromiseResolve(undefined);
}
reading = true;
const byobRequest = readableByteStreamControllerGetBYOBRequest(
branch1[_controller],
);
if (byobRequest === null) {
pullWithDefaultReader();
} else {
pullWithBYOBReader(byobRequest[_view], false);
}
return PromiseResolve(undefined);
}
function pull2Algorithm() {
if (reading) {
readAgainForBranch2 = true;
return PromiseResolve(undefined);
}
reading = true;
const byobRequest = readableByteStreamControllerGetBYOBRequest(
branch2[_controller],
);
if (byobRequest === null) {
pullWithDefaultReader();
} else {
pullWithBYOBReader(byobRequest[_view], true);
}
return PromiseResolve(undefined);
}
function cancel1Algorithm(reason) {
canceled1 = true;
reason1 = reason;
if (canceled2) {
const compositeReason = [reason1, reason2];
const cancelResult = readableStreamCancel(stream, compositeReason);
cancelPromise.resolve(cancelResult);
}
return cancelPromise.promise;
}
function cancel2Algorithm(reason) {
canceled2 = true;
reason2 = reason;
if (canceled1) {
const compositeReason = [reason1, reason2];
const cancelResult = readableStreamCancel(stream, compositeReason);
cancelPromise.resolve(cancelResult);
}
return cancelPromise.promise;
}
function startAlgorithm() {
return undefined;
}
branch1 = createReadableByteStream(
startAlgorithm,
pull1Algorithm,
cancel1Algorithm,
);
branch2 = createReadableByteStream(
startAlgorithm,
pull2Algorithm,
cancel2Algorithm,
);
branch1[_original] = stream;
branch2[_original] = stream;
forwardReaderError(reader);
return [branch1, branch2];
}
/**
* @param {ReadableStream} stream
* @param {ReadableByteStreamController} controller
* @param {() => void} startAlgorithm
* @param {() => Promise} pullAlgorithm
* @param {(reason: any) => Promise} cancelAlgorithm
* @param {number} highWaterMark
* @param {number | undefined} autoAllocateChunkSize
*/
function setUpReadableByteStreamController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark,
autoAllocateChunkSize,
) {
assert(stream[_controller] === undefined);
if (autoAllocateChunkSize !== undefined) {
assert(NumberIsInteger(autoAllocateChunkSize));
assert(autoAllocateChunkSize >= 0);
}
controller[_stream] = stream;
controller[_pullAgain] = controller[_pulling] = false;
controller[_byobRequest] = null;
resetQueue(controller);
controller[_closeRequested] = controller[_started] = false;
controller[_strategyHWM] = highWaterMark;
controller[_pullAlgorithm] = pullAlgorithm;
controller[_cancelAlgorithm] = cancelAlgorithm;
controller[_autoAllocateChunkSize] = autoAllocateChunkSize;
controller[_pendingPullIntos] = [];
stream[_controller] = controller;
const startResult = startAlgorithm();
const startPromise = PromiseResolve(startResult);
setPromiseIsHandledToTrue(
PromisePrototypeThen(
startPromise,
() => {
controller[_started] = true;
assert(controller[_pulling] === false);
assert(controller[_pullAgain] === false);
readableByteStreamControllerCallPullIfNeeded(controller);
},
(r) => {
readableByteStreamControllerError(controller, r);
},
),
);
}
/**
* @param {ReadableStream} stream
* @param {UnderlyingSource} underlyingSource
* @param {UnderlyingSource} underlyingSourceDict
* @param {number} highWaterMark
*/
function setUpReadableByteStreamControllerFromUnderlyingSource(
stream,
underlyingSource,
underlyingSourceDict,
highWaterMark,
) {
const controller = new ReadableByteStreamController(_brand);
/** @type {() => void} */
let startAlgorithm = _defaultStartAlgorithm;
/** @type {() => Promise} */
let pullAlgorithm = _defaultPullAlgorithm;
/** @type {(reason: any) => Promise} */
let cancelAlgorithm = _defaultCancelAlgorithm;
if (underlyingSourceDict.start !== undefined) {
startAlgorithm = () =>
webidl.invokeCallbackFunction(
underlyingSourceDict.start,
[controller],
underlyingSource,
webidl.converters.any,
"Failed to call 'startAlgorithm' on 'ReadableByteStreamController'",
);
}
if (underlyingSourceDict.pull !== undefined) {
pullAlgorithm = () =>
webidl.invokeCallbackFunction(
underlyingSourceDict.pull,
[controller],
underlyingSource,
webidl.converters["Promise"],
"Failed to call 'pullAlgorithm' on 'ReadableByteStreamController'",
true,
);
}
if (underlyingSourceDict.cancel !== undefined) {
cancelAlgorithm = (reason) =>
webidl.invokeCallbackFunction(
underlyingSourceDict.cancel,
[reason],
underlyingSource,
webidl.converters["Promise"],
"Failed to call 'cancelAlgorithm' on 'ReadableByteStreamController'",
true,
);
}
const autoAllocateChunkSize = underlyingSourceDict["autoAllocateChunkSize"];
if (autoAllocateChunkSize === 0) {
throw new TypeError("autoAllocateChunkSize must be greater than 0");
}
setUpReadableByteStreamController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark,
autoAllocateChunkSize,
);
}
/**
* @template R
* @param {ReadableStream} stream
* @param {ReadableStreamDefaultController} controller
* @param {(controller: ReadableStreamDefaultController) => void | Promise} startAlgorithm
* @param {(controller: ReadableStreamDefaultController) => Promise} pullAlgorithm
* @param {(reason: any) => Promise} cancelAlgorithm
* @param {number} highWaterMark
* @param {(chunk: R) => number} sizeAlgorithm
*/
function setUpReadableStreamDefaultController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark,
sizeAlgorithm,
) {
assert(stream[_controller] === undefined);
controller[_stream] = stream;
resetQueue(controller);
controller[_started] =
controller[_closeRequested] =
controller[_pullAgain] =
controller[_pulling] =
false;
controller[_strategySizeAlgorithm] = sizeAlgorithm;
controller[_strategyHWM] = highWaterMark;
controller[_pullAlgorithm] = pullAlgorithm;
controller[_cancelAlgorithm] = cancelAlgorithm;
stream[_controller] = controller;
const startResult = startAlgorithm(controller);
const startPromise = PromiseResolve(startResult);
uponPromise(startPromise, () => {
controller[_started] = true;
assert(controller[_pulling] === false);
assert(controller[_pullAgain] === false);
readableStreamDefaultControllerCallPullIfNeeded(controller);
}, (r) => {
readableStreamDefaultControllerError(controller, r);
});
}
/**
* @template R
* @param {ReadableStream} stream
* @param {UnderlyingSource} underlyingSource
* @param {UnderlyingSource} underlyingSourceDict
* @param {number} highWaterMark
* @param {(chunk: R) => number} sizeAlgorithm
*/
function setUpReadableStreamDefaultControllerFromUnderlyingSource(
stream,
underlyingSource,
underlyingSourceDict,
highWaterMark,
sizeAlgorithm,
) {
const controller = new ReadableStreamDefaultController(_brand);
/** @type {() => Promise} */
let startAlgorithm = _defaultStartAlgorithm;
/** @type {() => Promise} */
let pullAlgorithm = _defaultPullAlgorithm;
/** @type {(reason?: any) => Promise} */
let cancelAlgorithm = _defaultCancelAlgorithm;
if (underlyingSourceDict.start !== undefined) {
startAlgorithm = () =>
webidl.invokeCallbackFunction(
underlyingSourceDict.start,
[controller],
underlyingSource,
webidl.converters.any,
"Failed to call 'startAlgorithm' on 'ReadableStreamDefaultController'",
);
}
if (underlyingSourceDict.pull !== undefined) {
pullAlgorithm = () =>
webidl.invokeCallbackFunction(
underlyingSourceDict.pull,
[controller],
underlyingSource,
webidl.converters["Promise"],
"Failed to call 'pullAlgorithm' on 'ReadableStreamDefaultController'",
true,
);
}
if (underlyingSourceDict.cancel !== undefined) {
cancelAlgorithm = (reason) =>
webidl.invokeCallbackFunction(
underlyingSourceDict.cancel,
[reason],
underlyingSource,
webidl.converters["Promise"],
"Failed to call 'cancelAlgorithm' on 'ReadableStreamDefaultController'",
true,
);
}
setUpReadableStreamDefaultController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark,
sizeAlgorithm,
);
}
/**
* @template R
* @param {ReadableStreamBYOBReader} reader
* @param {ReadableStream} stream
*/
function setUpReadableStreamBYOBReader(reader, stream) {
if (isReadableStreamLocked(stream)) {
throw new TypeError("ReadableStream is locked.");
}
if (
!(ObjectPrototypeIsPrototypeOf(
ReadableByteStreamControllerPrototype,
stream[_controller],
))
) {
throw new TypeError("Cannot use a BYOB reader with a non-byte stream");
}
readableStreamReaderGenericInitialize(reader, stream);
reader[_readIntoRequests] = [];
}
/**
* @template R
* @param {ReadableStreamDefaultReader} reader
* @param {ReadableStream} stream
*/
function setUpReadableStreamDefaultReader(reader, stream) {
if (isReadableStreamLocked(stream)) {
throw new TypeError("ReadableStream is locked.");
}
readableStreamReaderGenericInitialize(reader, stream);
reader[_readRequests] = new Queue();
}
/**
* @template O
* @param {TransformStream} stream
* @param {TransformStreamDefaultController} controller
* @param {(chunk: O, controller: TransformStreamDefaultController) => Promise} transformAlgorithm
* @param {(controller: TransformStreamDefaultController) => Promise} flushAlgorithm
* @param {(reason: any) => Promise} cancelAlgorithm
*/
function setUpTransformStreamDefaultController(
stream,
controller,
transformAlgorithm,
flushAlgorithm,
cancelAlgorithm,
) {
assert(ObjectPrototypeIsPrototypeOf(TransformStreamPrototype, stream));
assert(stream[_controller] === undefined);
controller[_stream] = stream;
stream[_controller] = controller;
controller[_transformAlgorithm] = transformAlgorithm;
controller[_flushAlgorithm] = flushAlgorithm;
controller[_cancelAlgorithm] = cancelAlgorithm;
}
/**
* @template I
* @template O
* @param {TransformStream} stream
* @param {Transformer} transformer
* @param {Transformer} transformerDict
*/
function setUpTransformStreamDefaultControllerFromTransformer(
stream,
transformer,
transformerDict,
) {
/** @type {TransformStreamDefaultController} */
const controller = new TransformStreamDefaultController(_brand);
/** @type {(chunk: O, controller: TransformStreamDefaultController) => Promise} */
let transformAlgorithm = (chunk) => {
try {
transformStreamDefaultControllerEnqueue(controller, chunk);
} catch (e) {
return PromiseReject(e);
}
return PromiseResolve(undefined);
};
/** @type {(controller: TransformStreamDefaultController) => Promise} */
let flushAlgorithm = _defaultFlushAlgorithm;
let cancelAlgorithm = _defaultCancelAlgorithm;
if (transformerDict.transform !== undefined) {
transformAlgorithm = (chunk, controller) =>
webidl.invokeCallbackFunction(
transformerDict.transform,
[chunk, controller],
transformer,
webidl.converters["Promise"],
"Failed to call 'transformAlgorithm' on 'TransformStreamDefaultController'",
true,
);
}
if (transformerDict.flush !== undefined) {
flushAlgorithm = (controller) =>
webidl.invokeCallbackFunction(
transformerDict.flush,
[controller],
transformer,
webidl.converters["Promise"],
"Failed to call 'flushAlgorithm' on 'TransformStreamDefaultController'",
true,
);
}
if (transformerDict.cancel !== undefined) {
cancelAlgorithm = (reason) =>
webidl.invokeCallbackFunction(
transformerDict.cancel,
[reason],
transformer,
webidl.converters["Promise"],
"Failed to call 'cancelAlgorithm' on 'TransformStreamDefaultController'",
true,
);
}
setUpTransformStreamDefaultController(
stream,
controller,
transformAlgorithm,
flushAlgorithm,
cancelAlgorithm,
);
}
/**
* @template W
* @param {WritableStream} stream
* @param {WritableStreamDefaultController} controller
* @param {(controller: WritableStreamDefaultController) => Promise} startAlgorithm
* @param {(chunk: W, controller: WritableStreamDefaultController) => Promise} writeAlgorithm
* @param {() => Promise} closeAlgorithm
* @param {(reason?: any) => Promise} abortAlgorithm
* @param {number} highWaterMark
* @param {(chunk: W) => number} sizeAlgorithm
*/
function setUpWritableStreamDefaultController(
stream,
controller,
startAlgorithm,
writeAlgorithm,
closeAlgorithm,
abortAlgorithm,
highWaterMark,
sizeAlgorithm,
) {
assert(isWritableStream(stream));
assert(stream[_controller] === undefined);
controller[_stream] = stream;
stream[_controller] = controller;
resetQueue(controller);
controller[_signal] = newSignal();
controller[_started] = false;
controller[_strategySizeAlgorithm] = sizeAlgorithm;
controller[_strategyHWM] = highWaterMark;
controller[_writeAlgorithm] = writeAlgorithm;
controller[_closeAlgorithm] = closeAlgorithm;
controller[_abortAlgorithm] = abortAlgorithm;
const backpressure = writableStreamDefaultControllerGetBackpressure(
controller,
);
writableStreamUpdateBackpressure(stream, backpressure);
const startResult = startAlgorithm(controller);
const startPromise = resolvePromiseWith(startResult);
uponPromise(startPromise, () => {
assert(stream[_state] === "writable" || stream[_state] === "erroring");
controller[_started] = true;
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}, (r) => {
assert(stream[_state] === "writable" || stream[_state] === "erroring");
controller[_started] = true;
writableStreamDealWithRejection(stream, r);
});
}
/**
* @template W
* @param {WritableStream} stream
* @param {UnderlyingSink} underlyingSink
* @param {UnderlyingSink} underlyingSinkDict
* @param {number} highWaterMark
* @param {(chunk: W) => number} sizeAlgorithm
*/
function setUpWritableStreamDefaultControllerFromUnderlyingSink(
stream,
underlyingSink,
underlyingSinkDict,
highWaterMark,
sizeAlgorithm,
) {
const controller = new WritableStreamDefaultController(_brand);
/** @type {(controller: WritableStreamDefaultController) => any} */
let startAlgorithm = _defaultStartAlgorithm;
/** @type {(chunk: W, controller: WritableStreamDefaultController) => Promise} */
let writeAlgorithm = _defaultWriteAlgorithm;
let closeAlgorithm = _defaultCloseAlgorithm;
/** @type {(reason?: any) => Promise} */
let abortAlgorithm = _defaultAbortAlgorithm;
if (underlyingSinkDict.start !== undefined) {
startAlgorithm = () =>
webidl.invokeCallbackFunction(
underlyingSinkDict.start,
[controller],
underlyingSink,
webidl.converters.any,
"Failed to call 'startAlgorithm' on 'WritableStreamDefaultController'",
);
}
if (underlyingSinkDict.write !== undefined) {
writeAlgorithm = (chunk) =>
webidl.invokeCallbackFunction(
underlyingSinkDict.write,
[chunk, controller],
underlyingSink,
webidl.converters["Promise"],
"Failed to call 'writeAlgorithm' on 'WritableStreamDefaultController'",
true,
);
}
if (underlyingSinkDict.close !== undefined) {
closeAlgorithm = () =>
webidl.invokeCallbackFunction(
underlyingSinkDict.close,
[],
underlyingSink,
webidl.converters["Promise"],
"Failed to call 'closeAlgorithm' on 'WritableStreamDefaultController'",
true,
);
}
if (underlyingSinkDict.abort !== undefined) {
abortAlgorithm = (reason) =>
webidl.invokeCallbackFunction(
underlyingSinkDict.abort,
[reason],
underlyingSink,
webidl.converters["Promise"],
"Failed to call 'abortAlgorithm' on 'WritableStreamDefaultController'",
true,
);
}
setUpWritableStreamDefaultController(
stream,
controller,
startAlgorithm,
writeAlgorithm,
closeAlgorithm,
abortAlgorithm,
highWaterMark,
sizeAlgorithm,
);
}
/**
* @template W
* @param {WritableStreamDefaultWriter} writer
* @param {WritableStream} stream
*/
function setUpWritableStreamDefaultWriter(writer, stream) {
if (isWritableStreamLocked(stream) === true) {
throw new TypeError("The stream is already locked.");
}
writer[_stream] = stream;
stream[_writer] = writer;
const state = stream[_state];
if (state === "writable") {
if (
writableStreamCloseQueuedOrInFlight(stream) === false &&
stream[_backpressure] === true
) {
writer[_readyPromise] = new Deferred();
} else {
writer[_readyPromise] = new Deferred();
writer[_readyPromise].resolve(undefined);
}
writer[_closedPromise] = new Deferred();
} else if (state === "erroring") {
writer[_readyPromise] = new Deferred();
writer[_readyPromise].reject(stream[_storedError]);
setPromiseIsHandledToTrue(writer[_readyPromise].promise);
writer[_closedPromise] = new Deferred();
} else if (state === "closed") {
writer[_readyPromise] = new Deferred();
writer[_readyPromise].resolve(undefined);
writer[_closedPromise] = new Deferred();
writer[_closedPromise].resolve(undefined);
} else {
assert(state === "errored");
const storedError = stream[_storedError];
writer[_readyPromise] = new Deferred();
writer[_readyPromise].reject(storedError);
setPromiseIsHandledToTrue(writer[_readyPromise].promise);
writer[_closedPromise] = new Deferred();
writer[_closedPromise].reject(storedError);
setPromiseIsHandledToTrue(writer[_closedPromise].promise);
}
}
/** @param {TransformStreamDefaultController} controller */
function transformStreamDefaultControllerClearAlgorithms(controller) {
controller[_transformAlgorithm] = undefined;
controller[_flushAlgorithm] = undefined;
controller[_cancelAlgorithm] = undefined;
}
/**
* @template O
* @param {TransformStreamDefaultController} controller
* @param {O} chunk
*/
function transformStreamDefaultControllerEnqueue(controller, chunk) {
const stream = controller[_stream];
const readableController = stream[_readable][_controller];
if (
readableStreamDefaultControllerCanCloseOrEnqueue(
/** @type {ReadableStreamDefaultController} */ readableController,
) === false
) {
throw new TypeError("Readable stream is unavailable.");
}
try {
readableStreamDefaultControllerEnqueue(
/** @type {ReadableStreamDefaultController} */ readableController,
chunk,
);
} catch (e) {
transformStreamErrorWritableAndUnblockWrite(stream, e);
throw stream[_readable][_storedError];
}
const backpressure = readableStreamDefaultcontrollerHasBackpressure(
/** @type {ReadableStreamDefaultController} */ readableController,
);
if (backpressure !== stream[_backpressure]) {
assert(backpressure === true);
transformStreamSetBackpressure(stream, true);
}
}
/**
* @param {TransformStreamDefaultController} controller
* @param {any=} e
*/
function transformStreamDefaultControllerError(controller, e) {
transformStreamError(controller[_stream], e);
}
/**
* @template O
* @param {TransformStreamDefaultController} controller
* @param {any} chunk
* @returns {Promise}
*/
function transformStreamDefaultControllerPerformTransform(controller, chunk) {
const transformPromise = controller[_transformAlgorithm](chunk, controller);
return transformPromiseWith(transformPromise, undefined, (r) => {
transformStreamError(controller[_stream], r);
throw r;
});
}
/** @param {TransformStreamDefaultController} controller */
function transformStreamDefaultControllerTerminate(controller) {
const stream = controller[_stream];
const readableController = stream[_readable][_controller];
readableStreamDefaultControllerClose(
/** @type {ReadableStreamDefaultController} */ readableController,
);
const error = new TypeError("The stream has been terminated.");
transformStreamErrorWritableAndUnblockWrite(stream, error);
}
/**
* @template I
* @template O
* @param {TransformStream} stream
* @param {any=} reason
* @returns {Promise}
*/
function transformStreamDefaultSinkAbortAlgorithm(stream, reason) {
const controller = stream[_controller];
if (controller[_finishPromise] !== undefined) {
return controller[_finishPromise].promise;
}
const readable = stream[_readable];
controller[_finishPromise] = new Deferred();
const cancelPromise = controller[_cancelAlgorithm](reason);
transformStreamDefaultControllerClearAlgorithms(controller);
transformPromiseWith(cancelPromise, () => {
if (readable[_state] === "errored") {
controller[_finishPromise].reject(readable[_storedError]);
} else {
readableStreamDefaultControllerError(readable[_controller], reason);
controller[_finishPromise].resolve(undefined);
}
}, (r) => {
readableStreamDefaultControllerError(readable[_controller], r);
controller[_finishPromise].reject(r);
});
return controller[_finishPromise].promise;
}
/**
* @template I
* @template O
* @param {TransformStream} stream
* @returns {Promise}
*/
function transformStreamDefaultSinkCloseAlgorithm(stream) {
const controller = stream[_controller];
if (controller[_finishPromise] !== undefined) {
return controller[_finishPromise].promise;
}
const readable = stream[_readable];
controller[_finishPromise] = new Deferred();
const flushPromise = controller[_flushAlgorithm](controller);
transformStreamDefaultControllerClearAlgorithms(controller);
transformPromiseWith(flushPromise, () => {
if (readable[_state] === "errored") {
controller[_finishPromise].reject(readable[_storedError]);
} else {
readableStreamDefaultControllerClose(readable[_controller]);
controller[_finishPromise].resolve(undefined);
}
}, (r) => {
readableStreamDefaultControllerError(readable[_controller], r);
controller[_finishPromise].reject(r);
});
return controller[_finishPromise].promise;
}
/**
* @template I
* @template O
* @param {TransformStream} stream
* @param {I} chunk
* @returns {Promise}
*/
function transformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
assert(stream[_writable][_state] === "writable");
const controller = stream[_controller];
if (stream[_backpressure] === true) {
const backpressureChangePromise = stream[_backpressureChangePromise];
assert(backpressureChangePromise !== undefined);
return transformPromiseWith(backpressureChangePromise.promise, () => {
const writable = stream[_writable];
const state = writable[_state];
if (state === "erroring") {
throw writable[_storedError];
}
assert(state === "writable");
return transformStreamDefaultControllerPerformTransform(
controller,
chunk,
);
});
}
return transformStreamDefaultControllerPerformTransform(controller, chunk);
}
/**
* @template I
* @template O
* @param {TransformStream} stream
* @param {any=} reason
* @returns {Promise}
*/
function transformStreamDefaultSourceCancelAlgorithm(stream, reason) {
const controller = stream[_controller];
if (controller[_finishPromise] !== undefined) {
return controller[_finishPromise].promise;
}
const writable = stream[_writable];
controller[_finishPromise] = new Deferred();
const cancelPromise = controller[_cancelAlgorithm](reason);
transformStreamDefaultControllerClearAlgorithms(controller);
transformPromiseWith(cancelPromise, () => {
if (writable[_state] === "errored") {
controller[_finishPromise].reject(writable[_storedError]);
} else {
writableStreamDefaultControllerErrorIfNeeded(
writable[_controller],
reason,
);
transformStreamUnblockWrite(stream);
controller[_finishPromise].resolve(undefined);
}
}, (r) => {
writableStreamDefaultControllerErrorIfNeeded(writable[_controller], r);
transformStreamUnblockWrite(stream);
controller[_finishPromise].reject(r);
});
return controller[_finishPromise].promise;
}
/**
* @param {TransformStream} stream
* @returns {Promise}
*/
function transformStreamDefaultSourcePullAlgorithm(stream) {
assert(stream[_backpressure] === true);
assert(stream[_backpressureChangePromise] !== undefined);
transformStreamSetBackpressure(stream, false);
return stream[_backpressureChangePromise].promise;
}
/**
* @param {TransformStream} stream
* @param {any=} e
*/
function transformStreamError(stream, e) {
readableStreamDefaultControllerError(
/** @type {ReadableStreamDefaultController} */ stream[_readable][
_controller
],
e,
);
transformStreamErrorWritableAndUnblockWrite(stream, e);
}
/**
* @param {TransformStream} stream
* @param {any=} e
*/
function transformStreamErrorWritableAndUnblockWrite(stream, e) {
transformStreamDefaultControllerClearAlgorithms(stream[_controller]);
writableStreamDefaultControllerErrorIfNeeded(
stream[_writable][_controller],
e,
);
transformStreamUnblockWrite(stream);
}
/**
* @param {TransformStream} stream
* @param {boolean} backpressure
*/
function transformStreamSetBackpressure(stream, backpressure) {
assert(stream[_backpressure] !== backpressure);
if (stream[_backpressureChangePromise] !== undefined) {
stream[_backpressureChangePromise].resolve(undefined);
}
stream[_backpressureChangePromise] = new Deferred();
stream[_backpressure] = backpressure;
}
/**
* @param {TransformStream} stream
*/
function transformStreamUnblockWrite(stream) {
if (stream[_backpressure] === true) {
transformStreamSetBackpressure(stream, false);
}
}
/**
* @param {WritableStream} stream
* @param {any=} reason
* @returns {Promise}
*/
function writableStreamAbort(stream, reason) {
const state = stream[_state];
if (state === "closed" || state === "errored") {
return PromiseResolve(undefined);
}
stream[_controller][_signal][signalAbort](reason);
if (state === "closed" || state === "errored") {
return PromiseResolve(undefined);
}
if (stream[_pendingAbortRequest] !== undefined) {
return stream[_pendingAbortRequest].deferred.promise;
}
assert(state === "writable" || state === "erroring");
let wasAlreadyErroring = false;
if (state === "erroring") {
wasAlreadyErroring = true;
reason = undefined;
}
/** Deferred */
const deferred = new Deferred();
stream[_pendingAbortRequest] = {
deferred,
reason,
wasAlreadyErroring,
};
if (wasAlreadyErroring === false) {
writableStreamStartErroring(stream, reason);
}
return deferred.promise;
}
/**
* @param {WritableStream} stream
* @returns {Promise}
*/
function writableStreamAddWriteRequest(stream) {
assert(isWritableStreamLocked(stream) === true);
assert(stream[_state] === "writable");
/** @type {Deferred} */
const deferred = new Deferred();
ArrayPrototypePush(stream[_writeRequests], deferred);
return deferred.promise;
}
/**
* @param {WritableStream} stream
* @returns {Promise}
*/
function writableStreamClose(stream) {
const state = stream[_state];
if (state === "closed" || state === "errored") {
return PromiseReject(
new TypeError("Writable stream is closed or errored."),
);
}
assert(state === "writable" || state === "erroring");
assert(writableStreamCloseQueuedOrInFlight(stream) === false);
/** @type {Deferred} */
const deferred = new Deferred();
stream[_closeRequest] = deferred;
const writer = stream[_writer];
if (
writer !== undefined && stream[_backpressure] === true &&
state === "writable"
) {
writer[_readyPromise].resolve(undefined);
}
writableStreamDefaultControllerClose(stream[_controller]);
return deferred.promise;
}
/**
* @param {WritableStream} stream
* @returns {boolean}
*/
function writableStreamCloseQueuedOrInFlight(stream) {
if (
stream[_closeRequest] === undefined &&
stream[_inFlightCloseRequest] === undefined
) {
return false;
}
return true;
}
/**
* @param {WritableStream} stream
* @param {any=} error
*/
function writableStreamDealWithRejection(stream, error) {
const state = stream[_state];
if (state === "writable") {
writableStreamStartErroring(stream, error);
return;
}
assert(state === "erroring");
writableStreamFinishErroring(stream);
}
/**
* @template W
* @param {WritableStreamDefaultController} controller
*/
function writableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
const stream = controller[_stream];
if (controller[_started] === false) {
return;
}
if (stream[_inFlightWriteRequest] !== undefined) {
return;
}
const state = stream[_state];
assert(state !== "closed" && state !== "errored");
if (state === "erroring") {
writableStreamFinishErroring(stream);
return;
}
if (controller[_queue].size === 0) {
return;
}
const value = peekQueueValue(controller);
if (value === _close) {
writableStreamDefaultControllerProcessClose(controller);
} else {
writableStreamDefaultControllerProcessWrite(controller, value);
}
}
function writableStreamDefaultControllerClearAlgorithms(controller) {
controller[_writeAlgorithm] = undefined;
controller[_closeAlgorithm] = undefined;
controller[_abortAlgorithm] = undefined;
controller[_strategySizeAlgorithm] = undefined;
}
/** @param {WritableStreamDefaultController} controller */
function writableStreamDefaultControllerClose(controller) {
enqueueValueWithSize(controller, _close, 0);
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}
/**
* @param {WritableStreamDefaultController} controller
* @param {any} error
*/
function writableStreamDefaultControllerError(controller, error) {
const stream = controller[_stream];
assert(stream[_state] === "writable");
writableStreamDefaultControllerClearAlgorithms(controller);
writableStreamStartErroring(stream, error);
}
/**
* @param {WritableStreamDefaultController} controller
* @param {any} error
*/
function writableStreamDefaultControllerErrorIfNeeded(controller, error) {
if (controller[_stream][_state] === "writable") {
writableStreamDefaultControllerError(controller, error);
}
}
/**
* @param {WritableStreamDefaultController} controller
* @returns {boolean}
*/
function writableStreamDefaultControllerGetBackpressure(controller) {
const desiredSize = writableStreamDefaultControllerGetDesiredSize(
controller,
);
return desiredSize <= 0;
}
/**
* @template W
* @param {WritableStreamDefaultController} controller
* @param {W} chunk
* @returns {number}
*/
function writableStreamDefaultControllerGetChunkSize(controller, chunk) {
let value;
try {
value = controller[_strategySizeAlgorithm](chunk);
} catch (e) {
writableStreamDefaultControllerErrorIfNeeded(controller, e);
return 1;
}
return value;
}
/**
* @param {WritableStreamDefaultController} controller
* @returns {number}
*/
function writableStreamDefaultControllerGetDesiredSize(controller) {
return controller[_strategyHWM] - controller[_queueTotalSize];
}
/** @param {WritableStreamDefaultController} controller */
function writableStreamDefaultControllerProcessClose(controller) {
const stream = controller[_stream];
writableStreamMarkCloseRequestInFlight(stream);
dequeueValue(controller);
assert(controller[_queue].size === 0);
const sinkClosePromise = controller[_closeAlgorithm]();
writableStreamDefaultControllerClearAlgorithms(controller);
uponPromise(sinkClosePromise, () => {
writableStreamFinishInFlightClose(stream);
}, (reason) => {
writableStreamFinishInFlightCloseWithError(stream, reason);
});
}
/**
* @template W
* @param {WritableStreamDefaultController} controller
* @param {W} chunk
*/
function writableStreamDefaultControllerProcessWrite(controller, chunk) {
const stream = controller[_stream];
writableStreamMarkFirstWriteRequestInFlight(stream);
const sinkWritePromise = controller[_writeAlgorithm](chunk, controller);
uponPromise(sinkWritePromise, () => {
writableStreamFinishInFlightWrite(stream);
const state = stream[_state];
assert(state === "writable" || state === "erroring");
dequeueValue(controller);
if (
writableStreamCloseQueuedOrInFlight(stream) === false &&
state === "writable"
) {
const backpressure = writableStreamDefaultControllerGetBackpressure(
controller,
);
writableStreamUpdateBackpressure(stream, backpressure);
}
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}, (reason) => {
if (stream[_state] === "writable") {
writableStreamDefaultControllerClearAlgorithms(controller);
}
writableStreamFinishInFlightWriteWithError(stream, reason);
});
}
/**
* @template W
* @param {WritableStreamDefaultController} controller
* @param {W} chunk
* @param {number} chunkSize
*/
function writableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
try {
enqueueValueWithSize(controller, chunk, chunkSize);
} catch (e) {
writableStreamDefaultControllerErrorIfNeeded(controller, e);
return;
}
const stream = controller[_stream];
if (
writableStreamCloseQueuedOrInFlight(stream) === false &&
stream[_state] === "writable"
) {
const backpressure = writableStreamDefaultControllerGetBackpressure(
controller,
);
writableStreamUpdateBackpressure(stream, backpressure);
}
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @param {any=} reason
* @returns {Promise}
*/
function writableStreamDefaultWriterAbort(writer, reason) {
const stream = writer[_stream];
assert(stream !== undefined);
return writableStreamAbort(stream, reason);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @returns {Promise}
*/
function writableStreamDefaultWriterClose(writer) {
const stream = writer[_stream];
assert(stream !== undefined);
return writableStreamClose(stream);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @returns {Promise}
*/
function writableStreamDefaultWriterCloseWithErrorPropagation(writer) {
const stream = writer[_stream];
assert(stream !== undefined);
const state = stream[_state];
if (
writableStreamCloseQueuedOrInFlight(stream) === true || state === "closed"
) {
return PromiseResolve(undefined);
}
if (state === "errored") {
return PromiseReject(stream[_storedError]);
}
assert(state === "writable" || state === "erroring");
return writableStreamDefaultWriterClose(writer);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @param {any=} error
*/
function writableStreamDefaultWriterEnsureClosedPromiseRejected(
writer,
error,
) {
if (writer[_closedPromise].state === "pending") {
writer[_closedPromise].reject(error);
} else {
writer[_closedPromise] = new Deferred();
writer[_closedPromise].reject(error);
}
setPromiseIsHandledToTrue(writer[_closedPromise].promise);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @param {any=} error
*/
function writableStreamDefaultWriterEnsureReadyPromiseRejected(
writer,
error,
) {
if (writer[_readyPromise].state === "pending") {
writer[_readyPromise].reject(error);
} else {
writer[_readyPromise] = new Deferred();
writer[_readyPromise].reject(error);
}
setPromiseIsHandledToTrue(writer[_readyPromise].promise);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @returns {number | null}
*/
function writableStreamDefaultWriterGetDesiredSize(writer) {
const stream = writer[_stream];
const state = stream[_state];
if (state === "errored" || state === "erroring") {
return null;
}
if (state === "closed") {
return 0;
}
return writableStreamDefaultControllerGetDesiredSize(stream[_controller]);
}
/** @param {WritableStreamDefaultWriter} writer */
function writableStreamDefaultWriterRelease(writer) {
const stream = writer[_stream];
assert(stream !== undefined);
assert(stream[_writer] === writer);
const releasedError = new TypeError(
"The writer has already been released.",
);
writableStreamDefaultWriterEnsureReadyPromiseRejected(
writer,
releasedError,
);
writableStreamDefaultWriterEnsureClosedPromiseRejected(
writer,
releasedError,
);
stream[_writer] = undefined;
writer[_stream] = undefined;
}
/**
* @template W
* @param {WritableStreamDefaultWriter} writer
* @param {W} chunk
* @returns {Promise}
*/
function writableStreamDefaultWriterWrite(writer, chunk) {
const stream = writer[_stream];
assert(stream !== undefined);
const controller = stream[_controller];
const chunkSize = writableStreamDefaultControllerGetChunkSize(
controller,
chunk,
);
if (stream !== writer[_stream]) {
return PromiseReject(new TypeError("Writer's stream is unexpected."));
}
const state = stream[_state];
if (state === "errored") {
return PromiseReject(stream[_storedError]);
}
if (
writableStreamCloseQueuedOrInFlight(stream) === true || state === "closed"
) {
return PromiseReject(
new TypeError("The stream is closing or is closed."),
);
}
if (state === "erroring") {
return PromiseReject(stream[_storedError]);
}
assert(state === "writable");
const promise = writableStreamAddWriteRequest(stream);
writableStreamDefaultControllerWrite(controller, chunk, chunkSize);
return promise;
}
/** @param {WritableStream} stream */
function writableStreamFinishErroring(stream) {
assert(stream[_state] === "erroring");
assert(writableStreamHasOperationMarkedInFlight(stream) === false);
stream[_state] = "errored";
stream[_controller][_errorSteps]();
const storedError = stream[_storedError];
const writeRequests = stream[_writeRequests];
for (let i = 0; i < writeRequests.length; ++i) {
const writeRequest = writeRequests[i];
writeRequest.reject(storedError);
}
stream[_writeRequests] = [];
if (stream[_pendingAbortRequest] === undefined) {
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
return;
}
const abortRequest = stream[_pendingAbortRequest];
stream[_pendingAbortRequest] = undefined;
if (abortRequest.wasAlreadyErroring === true) {
abortRequest.deferred.reject(storedError);
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
return;
}
const promise = stream[_controller][_abortSteps](abortRequest.reason);
uponPromise(promise, () => {
abortRequest.deferred.resolve(undefined);
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
}, (reason) => {
abortRequest.deferred.reject(reason);
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
});
}
/** @param {WritableStream} stream */
function writableStreamFinishInFlightClose(stream) {
assert(stream[_inFlightCloseRequest] !== undefined);
stream[_inFlightCloseRequest].resolve(undefined);
stream[_inFlightCloseRequest] = undefined;
const state = stream[_state];
assert(state === "writable" || state === "erroring");
if (state === "erroring") {
stream[_storedError] = undefined;
if (stream[_pendingAbortRequest] !== undefined) {
stream[_pendingAbortRequest].deferred.resolve(undefined);
stream[_pendingAbortRequest] = undefined;
}
}
stream[_state] = "closed";
const writer = stream[_writer];
if (writer !== undefined) {
writer[_closedPromise].resolve(undefined);
}
assert(stream[_pendingAbortRequest] === undefined);
assert(stream[_storedError] === undefined);
}
/**
* @param {WritableStream} stream
* @param {any=} error
*/
function writableStreamFinishInFlightCloseWithError(stream, error) {
assert(stream[_inFlightCloseRequest] !== undefined);
stream[_inFlightCloseRequest].reject(error);
stream[_inFlightCloseRequest] = undefined;
assert(stream[_state] === "writable" || stream[_state] === "erroring");
if (stream[_pendingAbortRequest] !== undefined) {
stream[_pendingAbortRequest].deferred.reject(error);
stream[_pendingAbortRequest] = undefined;
}
writableStreamDealWithRejection(stream, error);
}
/** @param {WritableStream} stream */
function writableStreamFinishInFlightWrite(stream) {
assert(stream[_inFlightWriteRequest] !== undefined);
stream[_inFlightWriteRequest].resolve(undefined);
stream[_inFlightWriteRequest] = undefined;
}
/**
* @param {WritableStream} stream
* @param {any=} error
*/
function writableStreamFinishInFlightWriteWithError(stream, error) {
assert(stream[_inFlightWriteRequest] !== undefined);
stream[_inFlightWriteRequest].reject(error);
stream[_inFlightWriteRequest] = undefined;
assert(stream[_state] === "writable" || stream[_state] === "erroring");
writableStreamDealWithRejection(stream, error);
}
/**
* @param {WritableStream} stream
* @returns {boolean}
*/
function writableStreamHasOperationMarkedInFlight(stream) {
if (
stream[_inFlightWriteRequest] === undefined &&
stream[_inFlightCloseRequest] === undefined
) {
return false;
}
return true;
}
/** @param {WritableStream} stream */
function writableStreamMarkCloseRequestInFlight(stream) {
assert(stream[_inFlightCloseRequest] === undefined);
assert(stream[_closeRequest] !== undefined);
stream[_inFlightCloseRequest] = stream[_closeRequest];
stream[_closeRequest] = undefined;
}
/**
* @template W
* @param {WritableStream} stream
*/
function writableStreamMarkFirstWriteRequestInFlight(stream) {
assert(stream[_inFlightWriteRequest] === undefined);
assert(stream[_writeRequests].length);
const writeRequest = ArrayPrototypeShift(stream[_writeRequests]);
stream[_inFlightWriteRequest] = writeRequest;
}
/** @param {WritableStream} stream */
function writableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
assert(stream[_state] === "errored");
if (stream[_closeRequest] !== undefined) {
assert(stream[_inFlightCloseRequest] === undefined);
stream[_closeRequest].reject(stream[_storedError]);
stream[_closeRequest] = undefined;
}
const writer = stream[_writer];
if (writer !== undefined) {
writer[_closedPromise].reject(stream[_storedError]);
setPromiseIsHandledToTrue(writer[_closedPromise].promise);
}
}
/**
* @param {WritableStream} stream
* @param {any=} reason
*/
function writableStreamStartErroring(stream, reason) {
assert(stream[_storedError] === undefined);
assert(stream[_state] === "writable");
const controller = stream[_controller];
assert(controller !== undefined);
stream[_state] = "erroring";
stream[_storedError] = reason;
const writer = stream[_writer];
if (writer !== undefined) {
writableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
}
if (
writableStreamHasOperationMarkedInFlight(stream) === false &&
controller[_started] === true
) {
writableStreamFinishErroring(stream);
}
}
/**
* @param {WritableStream} stream
* @param {boolean} backpressure
*/
function writableStreamUpdateBackpressure(stream, backpressure) {
assert(stream[_state] === "writable");
assert(writableStreamCloseQueuedOrInFlight(stream) === false);
const writer = stream[_writer];
if (writer !== undefined && backpressure !== stream[_backpressure]) {
if (backpressure === true) {
writer[_readyPromise] = new Deferred();
} else {
assert(backpressure === false);
writer[_readyPromise].resolve(undefined);
}
}
stream[_backpressure] = backpressure;
}
/** @type {AsyncIterator} */
const asyncIteratorPrototype = ObjectGetPrototypeOf(AsyncGeneratorPrototype);
const _iteratorNext = Symbol("[[iteratorNext]]");
const _iteratorFinished = Symbol("[[iteratorFinished]]");
class ReadableStreamAsyncIteratorReadRequest {
#reader;
#promise;
constructor(reader, promise) {
this.#reader = reader;
this.#promise = promise;
}
chunkSteps(chunk) {
this.#reader[_iteratorNext] = null;
this.#promise.resolve({ value: chunk, done: false });
}
closeSteps() {
this.#reader[_iteratorNext] = null;
this.#reader[_iteratorFinished] = true;
readableStreamDefaultReaderRelease(this.#reader);
this.#promise.resolve({ value: undefined, done: true });
}
errorSteps(e) {
this.#reader[_iteratorNext] = null;
this.#reader[_iteratorFinished] = true;
readableStreamDefaultReaderRelease(this.#reader);
this.#promise.reject(e);
}
}
/** @type {AsyncIterator} */
const readableStreamAsyncIteratorPrototype = ObjectSetPrototypeOf({
/** @returns {Promise>} */
next() {
/** @type {ReadableStreamDefaultReader} */
const reader = this[_reader];
function nextSteps() {
if (reader[_iteratorFinished]) {
return PromiseResolve({ value: undefined, done: true });
}
if (reader[_stream] === undefined) {
return PromiseReject(
new TypeError(
"Cannot get the next iteration result once the reader has been released.",
),
);
}
/** @type {Deferred>} */
const promise = new Deferred();
// internal values (_iteratorNext & _iteratorFinished) are modified inside
// ReadableStreamAsyncIteratorReadRequest methods
// see: https://webidl.spec.whatwg.org/#es-default-asynchronous-iterator-object
const readRequest = new ReadableStreamAsyncIteratorReadRequest(
reader,
promise,
);
readableStreamDefaultReaderRead(reader, readRequest);
return PromisePrototypeThen(promise.promise);
}
return reader[_iteratorNext] = reader[_iteratorNext]
? PromisePrototypeThen(reader[_iteratorNext], nextSteps, nextSteps)
: nextSteps();
},
/**
* @param {unknown} arg
* @returns {Promise>}
*/
return(arg) {
/** @type {ReadableStreamDefaultReader} */
const reader = this[_reader];
const returnSteps = () => {
if (reader[_iteratorFinished]) {
return PromiseResolve({ value: arg, done: true });
}
reader[_iteratorFinished] = true;
if (reader[_stream] === undefined) {
return PromiseResolve({ value: undefined, done: true });
}
assert(reader[_readRequests].size === 0);
if (this[_preventCancel] === false) {
const result = readableStreamReaderGenericCancel(reader, arg);
readableStreamDefaultReaderRelease(reader);
return result;
}
readableStreamDefaultReaderRelease(reader);
return PromiseResolve({ value: undefined, done: true });
};
const returnPromise = reader[_iteratorNext]
? PromisePrototypeThen(reader[_iteratorNext], returnSteps, returnSteps)
: returnSteps();
return PromisePrototypeThen(
returnPromise,
() => ({ value: arg, done: true }),
);
},
}, asyncIteratorPrototype);
class ByteLengthQueuingStrategy {
/** @param {{ highWaterMark: number }} init */
constructor(init) {
const prefix = "Failed to construct 'ByteLengthQueuingStrategy'";
webidl.requiredArguments(arguments.length, 1, prefix);
init = webidl.converters.QueuingStrategyInit(init, prefix, "Argument 1");
this[_brand] = _brand;
this[_globalObject] = globalThis;
this[_highWaterMark] = init.highWaterMark;
}
/** @returns {number} */
get highWaterMark() {
webidl.assertBranded(this, ByteLengthQueuingStrategyPrototype);
return this[_highWaterMark];
}
/** @returns {(chunk: ArrayBufferView) => number} */
get size() {
webidl.assertBranded(this, ByteLengthQueuingStrategyPrototype);
initializeByteLengthSizeFunction(this[_globalObject]);
return WeakMapPrototypeGet(byteSizeFunctionWeakMap, this[_globalObject]);
}
[SymbolFor("Deno.privateCustomInspect")](inspect, inspectOptions) {
return inspect(
createFilteredInspectProxy({
object: this,
evaluate: ObjectPrototypeIsPrototypeOf(
ByteLengthQueuingStrategyPrototype,
this,
),
keys: [
"highWaterMark",
"size",
],
}),
inspectOptions,
);
}
}
webidl.configureInterface(ByteLengthQueuingStrategy);
const ByteLengthQueuingStrategyPrototype = ByteLengthQueuingStrategy.prototype;
/** @type {WeakMap number>} */
const byteSizeFunctionWeakMap = new SafeWeakMap();
function initializeByteLengthSizeFunction(globalObject) {
if (WeakMapPrototypeHas(byteSizeFunctionWeakMap, globalObject)) {
return;
}
// deno-lint-ignore prefer-primordials
const size = (chunk) => chunk.byteLength;
WeakMapPrototypeSet(byteSizeFunctionWeakMap, globalObject, size);
}
class CountQueuingStrategy {
/** @param {{ highWaterMark: number }} init */
constructor(init) {
const prefix = "Failed to construct 'CountQueuingStrategy'";
webidl.requiredArguments(arguments.length, 1, prefix);
init = webidl.converters.QueuingStrategyInit(init, prefix, "Argument 1");
this[_brand] = _brand;
this[_globalObject] = globalThis;
this[_highWaterMark] = init.highWaterMark;
}
/** @returns {number} */
get highWaterMark() {
webidl.assertBranded(this, CountQueuingStrategyPrototype);
return this[_highWaterMark];
}
/** @returns {(chunk: any) => 1} */
get size() {
webidl.assertBranded(this, CountQueuingStrategyPrototype);
initializeCountSizeFunction(this[_globalObject]);
return WeakMapPrototypeGet(countSizeFunctionWeakMap, this[_globalObject]);
}
[SymbolFor("Deno.privateCustomInspect")](inspect, inspectOptions) {
return inspect(
createFilteredInspectProxy({
object: this,
evaluate: ObjectPrototypeIsPrototypeOf(
CountQueuingStrategyPrototype,
this,
),
keys: [
"highWaterMark",
"size",
],
}),
inspectOptions,
);
}
}
webidl.configureInterface(CountQueuingStrategy);
const CountQueuingStrategyPrototype = CountQueuingStrategy.prototype;
/** @type {WeakMap 1>} */
const countSizeFunctionWeakMap = new SafeWeakMap();
/** @param {typeof globalThis} globalObject */
function initializeCountSizeFunction(globalObject) {
if (WeakMapPrototypeHas(countSizeFunctionWeakMap, globalObject)) {
return;
}
const size = () => 1;
WeakMapPrototypeSet(countSizeFunctionWeakMap, globalObject, size);
}
async function* createAsyncFromSyncIterator(syncIterator) {
// deno-lint-ignore prefer-primordials
yield* syncIterator;
}
// Ref: https://tc39.es/ecma262/#sec-getiterator
function getIterator(obj, async = false) {
if (async) {
if (obj[SymbolAsyncIterator] === undefined) {
if (obj[SymbolIterator] === undefined) {
throw new TypeError("No iterator found");
}
return createAsyncFromSyncIterator(obj[SymbolIterator]());
} else {
return obj[SymbolAsyncIterator]();
}
} else {
if (obj[SymbolIterator] === undefined) {
throw new TypeError("No iterator found");
}
return obj[SymbolIterator]();
}
}
const _resourceBacking = Symbol("[[resourceBacking]]");
// This distinction exists to prevent unrefable streams being used in
// regular fast streams that are unaware of refability
const _resourceBackingUnrefable = Symbol("[[resourceBackingUnrefable]]");
/** @template R */
class ReadableStream {
/** @type {ReadableStreamDefaultController | ReadableByteStreamController} */
[_controller];
/** @type {boolean} */
[_detached];
/** @type {boolean} */
[_disturbed];
/** @type {ReadableStreamDefaultReader | ReadableStreamBYOBReader} */
[_reader];
/** @type {"readable" | "closed" | "errored"} */
[_state];
/** @type {any} */
[_storedError];
/** @type {{ rid: number, autoClose: boolean } | null} */
[_resourceBacking] = null;
/**
* @param {UnderlyingSource=} underlyingSource
* @param {QueuingStrategy=} strategy
*/
constructor(underlyingSource = undefined, strategy = undefined) {
if (underlyingSource === _brand) {
this[_brand] = _brand;
return;
}
const prefix = "Failed to construct 'ReadableStream'";
underlyingSource = underlyingSource !== undefined
? webidl.converters.object(
underlyingSource,
prefix,
"Argument 1",
)
: null;
strategy = strategy !== undefined
? webidl.converters.QueuingStrategy(
strategy,
prefix,
"Argument 2",
)
: {};
const underlyingSourceDict = underlyingSource !== undefined
? webidl.converters.UnderlyingSource(
underlyingSource,
prefix,
"underlyingSource",
)
: {};
this[_brand] = _brand;
initializeReadableStream(this);
if (underlyingSourceDict.type === "bytes") {
if (strategy.size !== undefined) {
throw new RangeError(
`${prefix}: When underlying source is "bytes", strategy.size must be undefined.`,
);
}
const highWaterMark = extractHighWaterMark(strategy, 0);
setUpReadableByteStreamControllerFromUnderlyingSource(
// @ts-ignore cannot easily assert this is ReadableStream
this,
underlyingSource,
underlyingSourceDict,
highWaterMark,
);
} else {
const sizeAlgorithm = extractSizeAlgorithm(strategy);
const highWaterMark = extractHighWaterMark(strategy, 1);
setUpReadableStreamDefaultControllerFromUnderlyingSource(
this,
underlyingSource,
underlyingSourceDict,
highWaterMark,
sizeAlgorithm,
);
}
}
static from(asyncIterable) {
webidl.requiredArguments(
arguments.length,
1,
"Failed to call 'ReadableStream.from'",
);
asyncIterable = webidl.converters.any(asyncIterable);
const iterator = getIterator(asyncIterable, true);
const stream = createReadableStream(noop, async () => {
// deno-lint-ignore prefer-primordials
const res = await iterator.next();
if (typeof res !== "object") {
throw new TypeError("iterator.next value is not an object");
}
if (res.done) {
readableStreamDefaultControllerClose(stream[_controller]);
} else {
readableStreamDefaultControllerEnqueue(stream[_controller], res.value);
}
}, async (reason) => {
if (typeof iterator.return === "undefined") {
return undefined;
} else {
// deno-lint-ignore prefer-primordials
const res = await iterator.return(reason);
if (typeof res !== "object") {
throw new TypeError("iterator.return value is not an object");
} else {
return undefined;
}
}
}, 0);
return stream;
}
/** @returns {boolean} */
get locked() {
webidl.assertBranded(this, ReadableStreamPrototype);
return isReadableStreamLocked(this);
}
/**
* @param {any=} reason
* @returns {Promise}
*/
cancel(reason = undefined) {
try {
webidl.assertBranded(this, ReadableStreamPrototype);
if (reason !== undefined) {
reason = webidl.converters.any(reason);
}
} catch (err) {
return PromiseReject(err);
}
if (isReadableStreamLocked(this)) {
return PromiseReject(
new TypeError("Cannot cancel a locked ReadableStream."),
);
}
return readableStreamCancel(this, reason);
}
/**
* @param {ReadableStreamGetReaderOptions=} options
* @returns {ReadableStreamDefaultReader | ReadableStreamBYOBReader}
*/
getReader(options = undefined) {
webidl.assertBranded(this, ReadableStreamPrototype);
const prefix = "Failed to execute 'getReader' on 'ReadableStream'";
if (options !== undefined) {
options = webidl.converters.ReadableStreamGetReaderOptions(
options,
prefix,
"Argument 1",
);
} else {
options = {};
}
if (options.mode === undefined) {
return acquireReadableStreamDefaultReader(this);
} else {
assert(options.mode === "byob");
return acquireReadableStreamBYOBReader(this);
}
}
/**
* @template T
* @param {{ readable: ReadableStream, writable: WritableStream }} transform
* @param {PipeOptions=} options
* @returns {ReadableStream}
*/
pipeThrough(transform, options = {}) {
webidl.assertBranded(this, ReadableStreamPrototype);
const prefix = "Failed to execute 'pipeThrough' on 'ReadableStream'";
webidl.requiredArguments(arguments.length, 1, prefix);
transform = webidl.converters.ReadableWritablePair(
transform,
prefix,
"Argument 1",
);
options = webidl.converters.StreamPipeOptions(
options,
prefix,
"Argument 2",
);
const { readable, writable } = transform;
const { preventClose, preventAbort, preventCancel, signal } = options;
if (isReadableStreamLocked(this)) {
throw new TypeError("ReadableStream is already locked.");
}
if (isWritableStreamLocked(writable)) {
throw new TypeError("Target WritableStream is already locked.");
}
const promise = readableStreamPipeTo(
this,
writable,
preventClose,
preventAbort,
preventCancel,
signal,
);
setPromiseIsHandledToTrue(promise);
return readable;
}
/**
* @param {WritableStream} destination
* @param {PipeOptions=} options
* @returns {Promise}
*/
pipeTo(destination, options = {}) {
try {
webidl.assertBranded(this, ReadableStreamPrototype);
const prefix = "Failed to execute 'pipeTo' on 'ReadableStream'";
webidl.requiredArguments(arguments.length, 1, prefix);
destination = webidl.converters.WritableStream(
destination,
prefix,
"Argument 1",
);
options = webidl.converters.StreamPipeOptions(
options,
prefix,
"Argument 2",
);
} catch (err) {
return PromiseReject(err);
}
const { preventClose, preventAbort, preventCancel, signal } = options;
if (isReadableStreamLocked(this)) {
return PromiseReject(
new TypeError("ReadableStream is already locked."),
);
}
if (isWritableStreamLocked(destination)) {
return PromiseReject(
new TypeError("destination WritableStream is already locked."),
);
}
return readableStreamPipeTo(
this,
destination,
preventClose,
preventAbort,
preventCancel,
signal,
);
}
/** @returns {[ReadableStream, ReadableStream]} */
tee() {
webidl.assertBranded(this, ReadableStreamPrototype);
return readableStreamTee(this, false);
}
// TODO(lucacasonato): should be moved to webidl crate
/**
* @param {ReadableStreamIteratorOptions=} options
* @returns {AsyncIterableIterator}
*/
values(options = undefined) {
webidl.assertBranded(this, ReadableStreamPrototype);
let preventCancel = false;
if (options !== undefined) {
const prefix = "Failed to execute 'values' on 'ReadableStream'";
options = webidl.converters.ReadableStreamIteratorOptions(
options,
prefix,
"Argument 1",
);
preventCancel = options.preventCancel;
}
/** @type {AsyncIterableIterator} */
const iterator = ObjectCreate(readableStreamAsyncIteratorPrototype);
const reader = acquireReadableStreamDefaultReader(this);
iterator[_reader] = reader;
iterator[_preventCancel] = preventCancel;
return iterator;
}
[SymbolFor("Deno.privateCustomInspect")](inspect, inspectOptions) {
return inspect(
createFilteredInspectProxy({
object: this,
evaluate: ObjectPrototypeIsPrototypeOf(
ReadableStreamPrototype,
this,
),
keys: ["locked"],
}),
inspectOptions,
);
}
}
// TODO(lucacasonato): should be moved to webidl crate
ReadableStream.prototype[SymbolAsyncIterator] = ReadableStream.prototype.values;
ObjectDefineProperty(ReadableStream.prototype, SymbolAsyncIterator, {
writable: true,
enumerable: false,
configurable: true,
});
webidl.configureInterface(ReadableStream);
const ReadableStreamPrototype = ReadableStream.prototype;
function errorReadableStream(stream, e) {
readableStreamDefaultControllerError(stream[_controller], e);
}
/** @template R */
class ReadableStreamDefaultReader {
/** @type {Deferred} */
[_closedPromise];
/** @type {ReadableStream | undefined} */
[_stream];
/** @type {ReadRequest[]} */
[_readRequests];
/** @param {ReadableStream} stream */
constructor(stream) {
if (stream === _brand) {
this[_brand] = _brand;
return;
}
const prefix = "Failed to construct 'ReadableStreamDefaultReader'";
webidl.requiredArguments(arguments.length, 1, prefix);
stream = webidl.converters.ReadableStream(stream, prefix, "Argument 1");
this[_brand] = _brand;
setUpReadableStreamDefaultReader(this, stream);
}
/** @returns {Promise>} */
read() {
try {
webidl.assertBranded(this, ReadableStreamDefaultReaderPrototype);
} catch (err) {
return PromiseReject(err);
}
if (this[_stream] === undefined) {
return PromiseReject(
new TypeError("Reader has no associated stream."),
);
}
/** @type {Deferred>} */
const promise = new Deferred();
/** @type {ReadRequest} */
const readRequest = {
chunkSteps(chunk) {
promise.resolve({ value: chunk, done: false });
},
closeSteps() {
promise.resolve({ value: undefined, done: true });
},
errorSteps(e) {
promise.reject(e);
},
};
readableStreamDefaultReaderRead(this, readRequest);
return promise.promise;
}
/** @returns {void} */
releaseLock() {
webidl.assertBranded(this, ReadableStreamDefaultReaderPrototype);
if (this[_stream] === undefined) {
return;
}
readableStreamDefaultReaderRelease(this);
}
get closed() {
try {
webidl.assertBranded(this, ReadableStreamDefaultReaderPrototype);
} catch (err) {
return PromiseReject(err);
}
return this[_closedPromise].promise;
}
/**
* @param {any} reason
* @returns {Promise}
*/
cancel(reason = undefined) {
try {
webidl.assertBranded(this, ReadableStreamDefaultReaderPrototype);
if (reason !== undefined) {
reason = webidl.converters.any(reason);
}
} catch (err) {
return PromiseReject(err);
}
if (this[_stream] === undefined) {
return PromiseReject(
new TypeError("Reader has no associated stream."),
);
}
return readableStreamReaderGenericCancel(this, reason);
}
[SymbolFor("Deno.privateCustomInspect")](inspect, inspectOptions) {
return inspect(
createFilteredInspectProxy({
object: this,
evaluate: ObjectPrototypeIsPrototypeOf(
ReadableStreamDefaultReaderPrototype,
this,
),
keys: ["closed"],
}),
inspectOptions,
);
}
}
webidl.configureInterface(ReadableStreamDefaultReader);
const ReadableStreamDefaultReaderPrototype =
ReadableStreamDefaultReader.prototype;
/** @template R */
class ReadableStreamBYOBReader {
/** @type {Deferred} */
[_closedPromise];
/** @type {ReadableStream | undefined} */
[_stream];
/** @type {ReadIntoRequest[]} */
[_readIntoRequests];
/** @param {ReadableStream} stream */
constructor(stream) {
if (stream === _brand) {
this[_brand] = _brand;
return;
}
const prefix = "Failed to construct 'ReadableStreamBYOBReader'";
webidl.requiredArguments(arguments.length, 1, prefix);
stream = webidl.converters.ReadableStream(stream, prefix, "Argument 1");
this[_brand] = _brand;
setUpReadableStreamBYOBReader(this, stream);
}
/**
* @param {ArrayBufferView} view
* @returns {Promise}
*/
read(view) {
try {
webidl.assertBranded(this, ReadableStreamBYOBReaderPrototype);
const prefix = "Failed to execute 'read' on 'ReadableStreamBYOBReader'";
view = webidl.converters.ArrayBufferView(view, prefix, "Argument 1");
} catch (err) {
return PromiseReject(err);
}
let buffer, byteLength;
if (TypedArrayPrototypeGetSymbolToStringTag(view) === undefined) {
buffer = DataViewPrototypeGetBuffer(/** @type {DataView} */ (view));
byteLength = DataViewPrototypeGetByteLength(
/** @type {DataView} */ (view),
);
} else {
buffer = TypedArrayPrototypeGetBuffer(/** @type {Uint8Array} */ (view));
byteLength = TypedArrayPrototypeGetByteLength(
/** @type {Uint8Array} */ (view),
);
}
if (byteLength === 0) {
return PromiseReject(
new TypeError("view must have non-zero byteLength"),
);
}
if (getArrayBufferByteLength(buffer) === 0) {
if (isDetachedBuffer(buffer)) {
return PromiseReject(
new TypeError("view's buffer has been detached"),
);
}
return PromiseReject(
new TypeError("view's buffer must have non-zero byteLength"),
);
}
if (this[_stream] === undefined) {
return PromiseReject(
new TypeError("Reader has no associated stream."),
);
}
/** @type {Deferred} */
const promise = new Deferred();
/** @type {ReadIntoRequest} */
const readIntoRequest = {
chunkSteps(chunk) {
promise.resolve({ value: chunk, done: false });
},
closeSteps(chunk) {
promise.resolve({ value: chunk, done: true });
},
errorSteps(e) {
promise.reject(e);
},
};
readableStreamBYOBReaderRead(this, view, readIntoRequest);
return promise.promise;
}
/** @returns {void} */
releaseLock() {
webidl.assertBranded(this, ReadableStreamBYOBReaderPrototype);
if (this[_stream] === undefined) {
return;
}
readableStreamBYOBReaderRelease(this);
}
get closed() {
try {
webidl.assertBranded(this, ReadableStreamBYOBReaderPrototype);
} catch (err) {
return PromiseReject(err);
}
return this[_closedPromise].promise;
}
/**
* @param {any} reason
* @returns {Promise}
*/
cancel(reason = undefined) {
try {
webidl.assertBranded(this, ReadableStreamBYOBReaderPrototype);
if (reason !== undefined) {
reason = webidl.converters.any(reason);
}
} catch (err) {
return PromiseReject(err);
}
if (this[_stream] === undefined) {
return PromiseReject(
new TypeError("Reader has no associated stream."),
);
}
return readableStreamReaderGenericCancel(this, reason);
}
[SymbolFor("Deno.privateCustomInspect")](inspect, inspectOptions) {
return inspect(
createFilteredInspectProxy({
object: this,
evaluate: ObjectPrototypeIsPrototypeOf(
ReadableStreamBYOBReaderPrototype,
this,
),
keys: ["closed"],
}),
inspectOptions,
);
}
}
webidl.configureInterface(ReadableStreamBYOBReader);
const ReadableStreamBYOBReaderPrototype = ReadableStreamBYOBReader.prototype;
class ReadableStreamBYOBRequest {
/** @type {ReadableByteStreamController} */
[_controller];
/** @type {ArrayBufferView | null} */
[_view];
/** @returns {ArrayBufferView | null} */
get view() {
webidl.assertBranded(this, ReadableStreamBYOBRequestPrototype);
return this[_view];
}
constructor(brand = undefined) {
if (brand !== _brand) {
webidl.illegalConstructor();
}
this[_brand] = _brand;
}
respond(bytesWritten) {
webidl.assertBranded(this, ReadableStreamBYOBRequestPrototype);
const prefix = "Failed to execute 'respond' on 'ReadableStreamBYOBRequest'";
webidl.requiredArguments(arguments.length, 1, prefix);
bytesWritten = webidl.converters["unsigned long long"](
bytesWritten,
prefix,
"Argument 1",
{
enforceRange: true,
},
);
if (this[_controller] === undefined) {
throw new TypeError("This BYOB request has been invalidated");
}
let buffer, byteLength;
if (TypedArrayPrototypeGetSymbolToStringTag(this[_view]) === undefined) {
buffer = DataViewPrototypeGetBuffer(this[_view]);
byteLength = DataViewPrototypeGetByteLength(this[_view]);
} else {
buffer = TypedArrayPrototypeGetBuffer(this[_view]);
byteLength = TypedArrayPrototypeGetByteLength(this[_view]);
}
if (isDetachedBuffer(buffer)) {
throw new TypeError(
"The BYOB request's buffer has been detached and so cannot be used as a response",
);
}
assert(byteLength > 0);
assert(getArrayBufferByteLength(buffer) > 0);
readableByteStreamControllerRespond(this[_controller], bytesWritten);
}
respondWithNewView(view) {
webidl.assertBranded(this, ReadableStreamBYOBRequestPrototype);
const prefix =
"Failed to execute 'respondWithNewView' on 'ReadableStreamBYOBRequest'";
webidl.requiredArguments(arguments.length, 1, prefix);
view = webidl.converters.ArrayBufferView(view, prefix, "Argument 1");
if (this[_controller] === undefined) {
throw new TypeError("This BYOB request has been invalidated");
}
let buffer;
if (TypedArrayPrototypeGetSymbolToStringTag(view) === undefined) {
buffer = DataViewPrototypeGetBuffer(view);
} else {
buffer = TypedArrayPrototypeGetBuffer(view);
}
if (isDetachedBuffer(buffer)) {
throw new TypeError(
"The given view's buffer has been detached and so cannot be used as a response",
);
}
readableByteStreamControllerRespondWithNewView(this[_controller], view);
}
}
webidl.configureInterface(ReadableStreamBYOBRequest);
const ReadableStreamBYOBRequestPrototype = ReadableStreamBYOBRequest.prototype;
class ReadableByteStreamController {
/** @type {number | undefined} */
[_autoAllocateChunkSize];
/** @type {ReadableStreamBYOBRequest | null} */
[_byobRequest];
/** @type {(reason: any) => Promise} */
[_cancelAlgorithm];
/** @type {boolean} */
[_closeRequested];
/** @type {boolean} */
[_pullAgain];
/** @type {(controller: this) => Promise} */
[_pullAlgorithm];
/** @type {boolean} */
[_pulling];
/** @type {PullIntoDescriptor[]} */
[_pendingPullIntos];
/** @type {ReadableByteStreamQueueEntry[]} */
[_queue];
/** @type {number} */
[_queueTotalSize];
/** @type {boolean} */
[_started];
/** @type {number} */
[_strategyHWM];
/** @type {ReadableStream} */
[_stream];
constructor(brand = undefined) {
if (brand !== _brand) {
webidl.illegalConstructor();
}
this[_brand] = _brand;
}
/** @returns {ReadableStreamBYOBRequest | null} */
get byobRequest() {
webidl.assertBranded(this, ReadableByteStreamControllerPrototype);
return readableByteStreamControllerGetBYOBRequest(this);
}
/** @returns {number | null} */
get desiredSize() {
webidl.assertBranded(this, ReadableByteStreamControllerPrototype);
return readableByteStreamControllerGetDesiredSize(this);
}
/** @returns {void} */
close() {
webidl.assertBranded(this, ReadableByteStreamControllerPrototype);
if (this[_closeRequested] === true) {
throw new TypeError("Closed already requested.");
}
if (this[_stream][_state] !== "readable") {
throw new TypeError(
"ReadableByteStreamController's stream is not in a readable state.",
);
}
readableByteStreamControllerClose(this);
}
/**
* @param {ArrayBufferView} chunk
* @returns {void}
*/
enqueue(chunk) {
webidl.assertBranded(this, ReadableByteStreamControllerPrototype);
const prefix =
"Failed to execute 'enqueue' on 'ReadableByteStreamController'";
webidl.requiredArguments(arguments.length, 1, prefix);
const arg1 = "Argument 1";
chunk = webidl.converters.ArrayBufferView(chunk, prefix, arg1);
let buffer, byteLength;
if (TypedArrayPrototypeGetSymbolToStringTag(chunk) === undefined) {
buffer = DataViewPrototypeGetBuffer(/** @type {DataView} */ (chunk));
byteLength = DataViewPrototypeGetByteLength(
/** @type {DataView} */ (chunk),
);
} else {
buffer = TypedArrayPrototypeGetBuffer(/** @type {Uint8Array} */ (chunk));
byteLength = TypedArrayPrototypeGetByteLength(
/** @type {Uint8Array} */ (chunk),
);
}
if (byteLength === 0) {
throw webidl.makeException(
TypeError,
"length must be non-zero",
prefix,
arg1,
);
}
if (getArrayBufferByteLength(buffer) === 0) {
throw webidl.makeException(
TypeError,
"buffer length must be non-zero",
prefix,
arg1,
);
}
if (this[_closeRequested] === true) {
throw new TypeError(
"Cannot enqueue chunk after a close has been requested.",
);
}
if (this[_stream][_state] !== "readable") {
throw new TypeError(
"Cannot enqueue chunk when underlying stream is not readable.",
);
}
return readableByteStreamControllerEnqueue(this, chunk);
}
/**
* @param {any=} e
* @returns {void}
*/
error(e = undefined) {
webidl.assertBranded(this, ReadableByteStreamControllerPrototype);
if (e !== undefined) {
e = webidl.converters.any(e);
}
readableByteStreamControllerError(this, e);
}
[SymbolFor("Deno.privateCustomInspect")](inspect, inspectOptions) {
return inspect(
createFilteredInspectProxy({
object: this,
evaluate: ObjectPrototypeIsPrototypeOf(
ReadableByteStreamControllerPrototype,
this,
),
keys: ["desiredSize"],
}),
inspectOptions,
);
}
/**
* @param {any} reason
* @returns {Promise}
*/
[_cancelSteps](reason) {
readableByteStreamControllerClearPendingPullIntos(this);
resetQueue(this);
const result = this[_cancelAlgorithm](reason);
readableByteStreamControllerClearAlgorithms(this);
return result;
}
/**
* @param {ReadRequest