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// Forked from https://github.com/stardazed/sd-streams/tree/8928cf04b035fd02fb1340b7eb541c76be37e546
// Copyright (c) 2018-Present by Arthur Langereis - @zenmumbler MIT
/**
* streams/readable-byte-stream-controller - ReadableByteStreamController class implementation
* Part of Stardazed
* (c) 2018-Present by Arthur Langereis - @zenmumbler
* https://github.com/stardazed/sd-streams
*/
/* eslint-disable @typescript-eslint/no-explicit-any */
// TODO reenable this lint here
import * as rs from "./readable-internals.ts";
import * as q from "./queue-mixin.ts";
import * as shared from "./shared-internals.ts";
import { ReadableStreamBYOBRequest } from "./readable-stream-byob-request.ts";
import { Queue } from "./queue.ts";
import { UnderlyingByteSource } from "../dom_types.ts";
export class ReadableByteStreamController
implements rs.SDReadableByteStreamController {
[rs.autoAllocateChunkSize_]: number | undefined;
[rs.byobRequest_]: rs.SDReadableStreamBYOBRequest | undefined;
[rs.cancelAlgorithm_]: rs.CancelAlgorithm;
[rs.closeRequested_]: boolean;
[rs.controlledReadableByteStream_]: rs.SDReadableStream<ArrayBufferView>;
[rs.pullAgain_]: boolean;
[rs.pullAlgorithm_]: rs.PullAlgorithm<ArrayBufferView>;
[rs.pulling_]: boolean;
[rs.pendingPullIntos_]: rs.PullIntoDescriptor[];
[rs.started_]: boolean;
[rs.strategyHWM_]: number;
[q.queue_]: Queue<{
buffer: ArrayBufferLike;
byteOffset: number;
byteLength: number;
}>;
[q.queueTotalSize_]: number;
constructor() {
throw new TypeError();
}
get byobRequest(): rs.SDReadableStreamBYOBRequest | undefined {
if (!rs.isReadableByteStreamController(this)) {
throw new TypeError();
}
if (
this[rs.byobRequest_] === undefined &&
this[rs.pendingPullIntos_].length > 0
) {
const firstDescriptor = this[rs.pendingPullIntos_][0];
const view = new Uint8Array(
firstDescriptor.buffer,
firstDescriptor.byteOffset + firstDescriptor.bytesFilled,
firstDescriptor.byteLength - firstDescriptor.bytesFilled
);
const byobRequest = Object.create(
ReadableStreamBYOBRequest.prototype
) as ReadableStreamBYOBRequest;
rs.setUpReadableStreamBYOBRequest(byobRequest, this, view);
this[rs.byobRequest_] = byobRequest;
}
return this[rs.byobRequest_];
}
get desiredSize(): number | null {
if (!rs.isReadableByteStreamController(this)) {
throw new TypeError();
}
return rs.readableByteStreamControllerGetDesiredSize(this);
}
close(): void {
if (!rs.isReadableByteStreamController(this)) {
throw new TypeError();
}
if (this[rs.closeRequested_]) {
throw new TypeError("Stream is already closing");
}
if (this[rs.controlledReadableByteStream_][shared.state_] !== "readable") {
throw new TypeError("Stream is closed or errored");
}
rs.readableByteStreamControllerClose(this);
}
enqueue(chunk: ArrayBufferView): void {
if (!rs.isReadableByteStreamController(this)) {
throw new TypeError();
}
if (this[rs.closeRequested_]) {
throw new TypeError("Stream is already closing");
}
if (this[rs.controlledReadableByteStream_][shared.state_] !== "readable") {
throw new TypeError("Stream is closed or errored");
}
if (!ArrayBuffer.isView(chunk)) {
throw new TypeError("chunk must be a valid ArrayBufferView");
}
// If ! IsDetachedBuffer(chunk.[[ViewedArrayBuffer]]) is true, throw a TypeError exception.
return rs.readableByteStreamControllerEnqueue(this, chunk);
}
error(error?: shared.ErrorResult): void {
if (!rs.isReadableByteStreamController(this)) {
throw new TypeError();
}
rs.readableByteStreamControllerError(this, error);
}
[rs.cancelSteps_](reason: shared.ErrorResult): Promise<void> {
if (this[rs.pendingPullIntos_].length > 0) {
const firstDescriptor = this[rs.pendingPullIntos_][0];
firstDescriptor.bytesFilled = 0;
}
q.resetQueue(this);
const result = this[rs.cancelAlgorithm_](reason);
rs.readableByteStreamControllerClearAlgorithms(this);
return result;
}
[rs.pullSteps_](
forAuthorCode: boolean
): Promise<IteratorResult<ArrayBufferView, any>> {
const stream = this[rs.controlledReadableByteStream_];
// Assert: ! ReadableStreamHasDefaultReader(stream) is true.
if (this[q.queueTotalSize_] > 0) {
// Assert: ! ReadableStreamGetNumReadRequests(stream) is 0.
const entry = this[q.queue_].shift()!;
this[q.queueTotalSize_] -= entry.byteLength;
rs.readableByteStreamControllerHandleQueueDrain(this);
const view = new Uint8Array(
entry.buffer,
entry.byteOffset,
entry.byteLength
);
return Promise.resolve(
rs.readableStreamCreateReadResult(view, false, forAuthorCode)
);
}
const autoAllocateChunkSize = this[rs.autoAllocateChunkSize_];
if (autoAllocateChunkSize !== undefined) {
let buffer: ArrayBuffer;
try {
buffer = new ArrayBuffer(autoAllocateChunkSize);
} catch (error) {
return Promise.reject(error);
}
const pullIntoDescriptor: rs.PullIntoDescriptor = {
buffer,
byteOffset: 0,
byteLength: autoAllocateChunkSize,
bytesFilled: 0,
elementSize: 1,
ctor: Uint8Array,
readerType: "default"
};
this[rs.pendingPullIntos_].push(pullIntoDescriptor);
}
const promise = rs.readableStreamAddReadRequest(stream, forAuthorCode);
rs.readableByteStreamControllerCallPullIfNeeded(this);
return promise;
}
}
export function setUpReadableByteStreamControllerFromUnderlyingSource(
stream: rs.SDReadableStream<ArrayBufferView>,
underlyingByteSource: UnderlyingByteSource,
highWaterMark: number
): void {
// Assert: underlyingByteSource is not undefined.
const controller = Object.create(
ReadableByteStreamController.prototype
) as ReadableByteStreamController;
const startAlgorithm = (): any => {
return shared.invokeOrNoop(underlyingByteSource, "start", [controller]);
};
const pullAlgorithm = shared.createAlgorithmFromUnderlyingMethod(
underlyingByteSource,
"pull",
[controller]
);
const cancelAlgorithm = shared.createAlgorithmFromUnderlyingMethod(
underlyingByteSource,
"cancel",
[]
);
let autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
if (autoAllocateChunkSize !== undefined) {
autoAllocateChunkSize = Number(autoAllocateChunkSize);
if (
!shared.isInteger(autoAllocateChunkSize) ||
autoAllocateChunkSize <= 0
) {
throw new RangeError(
"autoAllocateChunkSize must be a positive, finite integer"
);
}
}
rs.setUpReadableByteStreamController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark,
autoAllocateChunkSize
);
}
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