mirror of
https://github.com/denoland/deno.git
synced 2024-11-29 16:30:56 -05:00
391 lines
12 KiB
TypeScript
391 lines
12 KiB
TypeScript
// Forked from https://github.com/stardazed/sd-streams/tree/8928cf04b035fd02fb1340b7eb541c76be37e546
|
|
// Copyright (c) 2018-Present by Arthur Langereis - @zenmumbler MIT
|
|
|
|
/**
|
|
* streams/readable-stream - ReadableStream class implementation
|
|
* Part of Stardazed
|
|
* (c) 2018-Present by Arthur Langereis - @zenmumbler
|
|
* https://github.com/stardazed/sd-streams
|
|
*/
|
|
|
|
/* eslint prefer-const: "off" */
|
|
// TODO remove this, surpressed because of
|
|
// 284:7 error 'branch1' is never reassigned. Use 'const' instead prefer-const
|
|
|
|
import * as rs from "./readable-internals.ts";
|
|
import * as shared from "./shared-internals.ts";
|
|
import {
|
|
QueuingStrategy,
|
|
QueuingStrategySizeCallback,
|
|
UnderlyingSource,
|
|
UnderlyingByteSource
|
|
} from "../dom_types.ts";
|
|
|
|
import {
|
|
ReadableStreamDefaultController,
|
|
setUpReadableStreamDefaultControllerFromUnderlyingSource
|
|
} from "./readable-stream-default-controller.ts";
|
|
import { ReadableStreamDefaultReader } from "./readable-stream-default-reader.ts";
|
|
|
|
import {
|
|
ReadableByteStreamController,
|
|
setUpReadableByteStreamControllerFromUnderlyingSource
|
|
} from "./readable-byte-stream-controller.ts";
|
|
import { SDReadableStreamBYOBReader } from "./readable-stream-byob-reader.ts";
|
|
|
|
export class SDReadableStream<OutputType>
|
|
implements rs.SDReadableStream<OutputType> {
|
|
[shared.state_]: rs.ReadableStreamState;
|
|
[shared.storedError_]: shared.ErrorResult;
|
|
[rs.reader_]: rs.SDReadableStreamReader<OutputType> | undefined;
|
|
[rs.readableStreamController_]: rs.SDReadableStreamControllerBase<OutputType>;
|
|
|
|
constructor(
|
|
underlyingSource: UnderlyingByteSource,
|
|
strategy?: { highWaterMark?: number; size?: undefined }
|
|
);
|
|
constructor(
|
|
underlyingSource?: UnderlyingSource<OutputType>,
|
|
strategy?: QueuingStrategy<OutputType>
|
|
);
|
|
constructor(
|
|
underlyingSource: UnderlyingSource<OutputType> | UnderlyingByteSource = {},
|
|
strategy:
|
|
| QueuingStrategy<OutputType>
|
|
| { highWaterMark?: number; size?: undefined } = {}
|
|
) {
|
|
rs.initializeReadableStream(this);
|
|
|
|
const sizeFunc = strategy.size;
|
|
const stratHWM = strategy.highWaterMark;
|
|
const sourceType = underlyingSource.type;
|
|
|
|
if (sourceType === undefined) {
|
|
const sizeAlgorithm = shared.makeSizeAlgorithmFromSizeFunction(sizeFunc);
|
|
const highWaterMark = shared.validateAndNormalizeHighWaterMark(
|
|
stratHWM === undefined ? 1 : stratHWM
|
|
);
|
|
setUpReadableStreamDefaultControllerFromUnderlyingSource(
|
|
this,
|
|
underlyingSource as UnderlyingSource<OutputType>,
|
|
highWaterMark,
|
|
sizeAlgorithm
|
|
);
|
|
} else if (String(sourceType) === "bytes") {
|
|
if (sizeFunc !== undefined) {
|
|
throw new RangeError(
|
|
"bytes streams cannot have a strategy with a `size` field"
|
|
);
|
|
}
|
|
const highWaterMark = shared.validateAndNormalizeHighWaterMark(
|
|
stratHWM === undefined ? 0 : stratHWM
|
|
);
|
|
setUpReadableByteStreamControllerFromUnderlyingSource(
|
|
(this as unknown) as rs.SDReadableStream<ArrayBufferView>,
|
|
underlyingSource as UnderlyingByteSource,
|
|
highWaterMark
|
|
);
|
|
} else {
|
|
throw new RangeError(
|
|
"The underlying source's `type` field must be undefined or 'bytes'"
|
|
);
|
|
}
|
|
}
|
|
|
|
get locked(): boolean {
|
|
return rs.isReadableStreamLocked(this);
|
|
}
|
|
|
|
getReader(): rs.SDReadableStreamDefaultReader<OutputType>;
|
|
getReader(options: { mode?: "byob" }): rs.SDReadableStreamBYOBReader;
|
|
getReader(options?: {
|
|
mode?: "byob";
|
|
}):
|
|
| rs.SDReadableStreamDefaultReader<OutputType>
|
|
| rs.SDReadableStreamBYOBReader {
|
|
if (!rs.isReadableStream(this)) {
|
|
throw new TypeError();
|
|
}
|
|
if (options === undefined) {
|
|
options = {};
|
|
}
|
|
const { mode } = options;
|
|
if (mode === undefined) {
|
|
return new ReadableStreamDefaultReader(this);
|
|
} else if (String(mode) === "byob") {
|
|
return new SDReadableStreamBYOBReader(
|
|
(this as unknown) as rs.SDReadableStream<ArrayBufferView>
|
|
);
|
|
}
|
|
throw RangeError("mode option must be undefined or `byob`");
|
|
}
|
|
|
|
cancel(reason: shared.ErrorResult): Promise<void> {
|
|
if (!rs.isReadableStream(this)) {
|
|
return Promise.reject(new TypeError());
|
|
}
|
|
if (rs.isReadableStreamLocked(this)) {
|
|
return Promise.reject(new TypeError("Cannot cancel a locked stream"));
|
|
}
|
|
return rs.readableStreamCancel(this, reason);
|
|
}
|
|
|
|
tee(): Array<SDReadableStream<OutputType>> {
|
|
return readableStreamTee(this, false);
|
|
}
|
|
|
|
/* TODO reenable these methods when we bring in writableStreams and transport types
|
|
pipeThrough<ResultType>(
|
|
transform: rs.GenericTransformStream<OutputType, ResultType>,
|
|
options: PipeOptions = {}
|
|
): rs.SDReadableStream<ResultType> {
|
|
const { readable, writable } = transform;
|
|
if (!rs.isReadableStream(this)) {
|
|
throw new TypeError();
|
|
}
|
|
if (!ws.isWritableStream(writable)) {
|
|
throw new TypeError("writable must be a WritableStream");
|
|
}
|
|
if (!rs.isReadableStream(readable)) {
|
|
throw new TypeError("readable must be a ReadableStream");
|
|
}
|
|
if (options.signal !== undefined && !shared.isAbortSignal(options.signal)) {
|
|
throw new TypeError("options.signal must be an AbortSignal instance");
|
|
}
|
|
if (rs.isReadableStreamLocked(this)) {
|
|
throw new TypeError("Cannot pipeThrough on a locked stream");
|
|
}
|
|
if (ws.isWritableStreamLocked(writable)) {
|
|
throw new TypeError("Cannot pipeThrough to a locked stream");
|
|
}
|
|
|
|
const pipeResult = pipeTo(this, writable, options);
|
|
pipeResult.catch(() => {});
|
|
|
|
return readable;
|
|
}
|
|
|
|
pipeTo(
|
|
dest: ws.WritableStream<OutputType>,
|
|
options: PipeOptions = {}
|
|
): Promise<void> {
|
|
if (!rs.isReadableStream(this)) {
|
|
return Promise.reject(new TypeError());
|
|
}
|
|
if (!ws.isWritableStream(dest)) {
|
|
return Promise.reject(
|
|
new TypeError("destination must be a WritableStream")
|
|
);
|
|
}
|
|
if (options.signal !== undefined && !shared.isAbortSignal(options.signal)) {
|
|
return Promise.reject(
|
|
new TypeError("options.signal must be an AbortSignal instance")
|
|
);
|
|
}
|
|
if (rs.isReadableStreamLocked(this)) {
|
|
return Promise.reject(new TypeError("Cannot pipe from a locked stream"));
|
|
}
|
|
if (ws.isWritableStreamLocked(dest)) {
|
|
return Promise.reject(new TypeError("Cannot pipe to a locked stream"));
|
|
}
|
|
|
|
return pipeTo(this, dest, options);
|
|
}
|
|
*/
|
|
}
|
|
|
|
export function createReadableStream<OutputType>(
|
|
startAlgorithm: rs.StartAlgorithm,
|
|
pullAlgorithm: rs.PullAlgorithm<OutputType>,
|
|
cancelAlgorithm: rs.CancelAlgorithm,
|
|
highWaterMark?: number,
|
|
sizeAlgorithm?: QueuingStrategySizeCallback<OutputType>
|
|
): SDReadableStream<OutputType> {
|
|
if (highWaterMark === undefined) {
|
|
highWaterMark = 1;
|
|
}
|
|
if (sizeAlgorithm === undefined) {
|
|
sizeAlgorithm = (): number => 1;
|
|
}
|
|
// Assert: ! IsNonNegativeNumber(highWaterMark) is true.
|
|
|
|
const stream = Object.create(SDReadableStream.prototype) as SDReadableStream<
|
|
OutputType
|
|
>;
|
|
rs.initializeReadableStream(stream);
|
|
const controller = Object.create(
|
|
ReadableStreamDefaultController.prototype
|
|
) as ReadableStreamDefaultController<OutputType>;
|
|
rs.setUpReadableStreamDefaultController(
|
|
stream,
|
|
controller,
|
|
startAlgorithm,
|
|
pullAlgorithm,
|
|
cancelAlgorithm,
|
|
highWaterMark,
|
|
sizeAlgorithm
|
|
);
|
|
return stream;
|
|
}
|
|
|
|
export function createReadableByteStream<OutputType>(
|
|
startAlgorithm: rs.StartAlgorithm,
|
|
pullAlgorithm: rs.PullAlgorithm<OutputType>,
|
|
cancelAlgorithm: rs.CancelAlgorithm,
|
|
highWaterMark?: number,
|
|
autoAllocateChunkSize?: number
|
|
): SDReadableStream<OutputType> {
|
|
if (highWaterMark === undefined) {
|
|
highWaterMark = 0;
|
|
}
|
|
// Assert: ! IsNonNegativeNumber(highWaterMark) is true.
|
|
if (autoAllocateChunkSize !== undefined) {
|
|
if (
|
|
!shared.isInteger(autoAllocateChunkSize) ||
|
|
autoAllocateChunkSize <= 0
|
|
) {
|
|
throw new RangeError(
|
|
"autoAllocateChunkSize must be a positive, finite integer"
|
|
);
|
|
}
|
|
}
|
|
|
|
const stream = Object.create(SDReadableStream.prototype) as SDReadableStream<
|
|
OutputType
|
|
>;
|
|
rs.initializeReadableStream(stream);
|
|
const controller = Object.create(
|
|
ReadableByteStreamController.prototype
|
|
) as ReadableByteStreamController;
|
|
rs.setUpReadableByteStreamController(
|
|
(stream as unknown) as SDReadableStream<ArrayBufferView>,
|
|
controller,
|
|
startAlgorithm,
|
|
(pullAlgorithm as unknown) as rs.PullAlgorithm<ArrayBufferView>,
|
|
cancelAlgorithm,
|
|
highWaterMark,
|
|
autoAllocateChunkSize
|
|
);
|
|
return stream;
|
|
}
|
|
|
|
export function readableStreamTee<OutputType>(
|
|
stream: SDReadableStream<OutputType>,
|
|
cloneForBranch2: boolean
|
|
): [SDReadableStream<OutputType>, SDReadableStream<OutputType>] {
|
|
if (!rs.isReadableStream(stream)) {
|
|
throw new TypeError();
|
|
}
|
|
|
|
const reader = new ReadableStreamDefaultReader(stream);
|
|
let closedOrErrored = false;
|
|
let canceled1 = false;
|
|
let canceled2 = false;
|
|
let reason1: shared.ErrorResult;
|
|
let reason2: shared.ErrorResult;
|
|
let branch1: SDReadableStream<OutputType>;
|
|
let branch2: SDReadableStream<OutputType>;
|
|
|
|
let cancelResolve: (reason: shared.ErrorResult) => void;
|
|
const cancelPromise = new Promise<void>(resolve => (cancelResolve = resolve));
|
|
|
|
const pullAlgorithm = (): Promise<void> => {
|
|
return rs
|
|
.readableStreamDefaultReaderRead(reader)
|
|
.then(({ value, done }) => {
|
|
if (done && !closedOrErrored) {
|
|
if (!canceled1) {
|
|
rs.readableStreamDefaultControllerClose(
|
|
branch1![
|
|
rs.readableStreamController_
|
|
] as ReadableStreamDefaultController<OutputType>
|
|
);
|
|
}
|
|
if (!canceled2) {
|
|
rs.readableStreamDefaultControllerClose(
|
|
branch2![
|
|
rs.readableStreamController_
|
|
] as ReadableStreamDefaultController<OutputType>
|
|
);
|
|
}
|
|
closedOrErrored = true;
|
|
}
|
|
if (closedOrErrored) {
|
|
return;
|
|
}
|
|
const value1 = value;
|
|
let value2 = value;
|
|
if (!canceled1) {
|
|
rs.readableStreamDefaultControllerEnqueue(
|
|
branch1![
|
|
rs.readableStreamController_
|
|
] as ReadableStreamDefaultController<OutputType>,
|
|
value1!
|
|
);
|
|
}
|
|
if (!canceled2) {
|
|
if (cloneForBranch2) {
|
|
value2 = shared.cloneValue(value2);
|
|
}
|
|
rs.readableStreamDefaultControllerEnqueue(
|
|
branch2![
|
|
rs.readableStreamController_
|
|
] as ReadableStreamDefaultController<OutputType>,
|
|
value2!
|
|
);
|
|
}
|
|
});
|
|
};
|
|
|
|
const cancel1Algorithm = (reason: shared.ErrorResult): Promise<void> => {
|
|
canceled1 = true;
|
|
reason1 = reason;
|
|
if (canceled2) {
|
|
const cancelResult = rs.readableStreamCancel(stream, [reason1, reason2]);
|
|
cancelResolve(cancelResult);
|
|
}
|
|
return cancelPromise;
|
|
};
|
|
|
|
const cancel2Algorithm = (reason: shared.ErrorResult): Promise<void> => {
|
|
canceled2 = true;
|
|
reason2 = reason;
|
|
if (canceled1) {
|
|
const cancelResult = rs.readableStreamCancel(stream, [reason1, reason2]);
|
|
cancelResolve(cancelResult);
|
|
}
|
|
return cancelPromise;
|
|
};
|
|
|
|
const startAlgorithm = (): undefined => undefined;
|
|
branch1 = createReadableStream(
|
|
startAlgorithm,
|
|
pullAlgorithm,
|
|
cancel1Algorithm
|
|
);
|
|
branch2 = createReadableStream(
|
|
startAlgorithm,
|
|
pullAlgorithm,
|
|
cancel2Algorithm
|
|
);
|
|
|
|
reader[rs.closedPromise_].promise.catch(error => {
|
|
if (!closedOrErrored) {
|
|
rs.readableStreamDefaultControllerError(
|
|
branch1![
|
|
rs.readableStreamController_
|
|
] as ReadableStreamDefaultController<OutputType>,
|
|
error
|
|
);
|
|
rs.readableStreamDefaultControllerError(
|
|
branch2![
|
|
rs.readableStreamController_
|
|
] as ReadableStreamDefaultController<OutputType>,
|
|
error
|
|
);
|
|
closedOrErrored = true;
|
|
}
|
|
});
|
|
|
|
return [branch1, branch2];
|
|
}
|