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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
import streamAdapters from './adapters.js';
/** @ignore */
export const ITERATOR_DONE: any = Object.freeze({ done: true, value: void (0) });
/** @ignore */
export type FileHandle = import('fs').promises.FileHandle;
/** @ignore */
export type ArrowJSONLike = { schema: any; batches?: any[]; dictionaries?: any[] };
/** @ignore */
export type ReadableDOMStreamOptions = { type: 'bytes' | undefined; autoAllocateChunkSize?: number; highWaterMark?: number };
/** @ignore */
export class ArrowJSON {
constructor(private _json: ArrowJSONLike) { }
public get schema(): any { return this._json['schema']; }
public get batches(): any[] { return (this._json['batches'] || []) as any[]; }
public get dictionaries(): any[] { return (this._json['dictionaries'] || []) as any[]; }
}
/** @ignore */
export interface Readable<T> {
readonly closed: Promise<void>;
cancel(reason?: any): Promise<void>;
read(size?: number | null): Promise<T | null>;
peek(size?: number | null): Promise<T | null>;
throw(value?: any): Promise<IteratorResult<any>>;
return(value?: any): Promise<IteratorResult<any>>;
next(size?: number | null): Promise<IteratorResult<T>>;
}
/** @ignore */
export interface Writable<T> {
readonly closed: Promise<void>;
close(): void;
write(chunk: T): void;
abort(reason?: any): void;
}
/** @ignore */
export interface ReadableWritable<TReadable, TWritable> extends Readable<TReadable>, Writable<TWritable> {
[Symbol.asyncIterator](): AsyncIterableIterator<TReadable>;
toDOMStream(options?: ReadableDOMStreamOptions): ReadableStream<TReadable>;
toNodeStream(options?: import('stream').ReadableOptions): import('stream').Readable;
}
/** @ignore */
export abstract class ReadableInterop<T> {
public abstract toDOMStream(options?: ReadableDOMStreamOptions): ReadableStream<T>;
public abstract toNodeStream(options?: import('stream').ReadableOptions): import('stream').Readable;
public tee(): [ReadableStream<T>, ReadableStream<T>] {
return this._getDOMStream().tee();
}
public pipe<R extends NodeJS.WritableStream>(writable: R, options?: { end?: boolean }) {
return this._getNodeStream().pipe(writable, options);
}
public pipeTo(writable: WritableStream<T>, options?: StreamPipeOptions) { return this._getDOMStream().pipeTo(writable, options); }
public pipeThrough<R extends ReadableStream<any>>(duplex: { writable: WritableStream<T>; readable: R }, options?: StreamPipeOptions) {
return this._getDOMStream().pipeThrough(duplex, options);
}
protected _DOMStream?: ReadableStream<T>;
private _getDOMStream() {
return this._DOMStream || (this._DOMStream = this.toDOMStream());
}
protected _nodeStream?: import('stream').Readable;
private _getNodeStream() {
return this._nodeStream || (this._nodeStream = this.toNodeStream());
}
}
/** @ignore */
type Resolution<T> = { resolve: (value: T | PromiseLike<T>) => void; reject: (reason?: any) => void };
/** @ignore */
export class AsyncQueue<TReadable = Uint8Array, TWritable = TReadable> extends ReadableInterop<TReadable>
implements AsyncIterableIterator<TReadable>, ReadableWritable<TReadable, TWritable> {
protected _values: TWritable[] = [];
protected _error?: { error: any };
protected _closedPromise: Promise<void>;
protected _closedPromiseResolve?: (value?: any) => void;
protected resolvers: Resolution<IteratorResult<TReadable>>[] = [];
constructor() {
super();
this._closedPromise = new Promise((r) => this._closedPromiseResolve = r);
}
public get closed(): Promise<void> { return this._closedPromise; }
public async cancel(reason?: any) { await this.return(reason); }
public write(value: TWritable) {
if (this._ensureOpen()) {
this.resolvers.length <= 0
? (this._values.push(value))
: (this.resolvers.shift()!.resolve({ done: false, value } as any));
}
}
public abort(value?: any) {
if (this._closedPromiseResolve) {
this.resolvers.length <= 0
? (this._error = { error: value })
: (this.resolvers.shift()!.reject({ done: true, value }));
}
}
public close() {
if (this._closedPromiseResolve) {
const { resolvers } = this;
while (resolvers.length > 0) {
resolvers.shift()!.resolve(ITERATOR_DONE);
}
this._closedPromiseResolve();
this._closedPromiseResolve = undefined;
}
}
public [Symbol.asyncIterator]() { return this; }
public toDOMStream(options?: ReadableDOMStreamOptions) {
return streamAdapters.toDOMStream(
(this._closedPromiseResolve || this._error)
? (this as AsyncIterable<TReadable>)
: (this._values as any) as Iterable<TReadable>,
options);
}
public toNodeStream(options?: import('stream').ReadableOptions) {
return streamAdapters.toNodeStream(
(this._closedPromiseResolve || this._error)
? (this as AsyncIterable<TReadable>)
: (this._values as any) as Iterable<TReadable>,
options);
}
public async throw(_?: any) { await this.abort(_); return ITERATOR_DONE; }
public async return(_?: any) { await this.close(); return ITERATOR_DONE; }
public async read(size?: number | null): Promise<TReadable | null> { return (await this.next(size, 'read')).value; }
public async peek(size?: number | null): Promise<TReadable | null> { return (await this.next(size, 'peek')).value; }
public next(..._args: any[]): Promise<IteratorResult<TReadable>> {
if (this._values.length > 0) {
return Promise.resolve({ done: false, value: this._values.shift()! } as any);
} else if (this._error) {
return Promise.reject({ done: true, value: this._error.error });
} else if (!this._closedPromiseResolve) {
return Promise.resolve(ITERATOR_DONE);
} else {
return new Promise<IteratorResult<TReadable>>((resolve, reject) => {
this.resolvers.push({ resolve, reject });
});
}
}
protected _ensureOpen() {
if (this._closedPromiseResolve) {
return true;
}
throw new Error(`AsyncQueue is closed`);
}
}
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