mirror of
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114 lines
3.3 KiB
TypeScript
114 lines
3.3 KiB
TypeScript
/*
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* Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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import "iframe-worker/shim"
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import {
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Observable,
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Subject,
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endWith,
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fromEvent,
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ignoreElements,
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mergeWith,
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share,
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takeUntil
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} from "rxjs"
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/* ----------------------------------------------------------------------------
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* Types
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* ------------------------------------------------------------------------- */
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/**
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* Worker message
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*/
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export interface WorkerMessage {
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type: unknown /* Message type */
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data?: unknown /* Message data */
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}
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/* ----------------------------------------------------------------------------
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* Helper functions
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* ------------------------------------------------------------------------- */
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/**
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* Create an observable for receiving from a web worker
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*
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* @template T - Data type
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*
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* @param worker - Web worker
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*
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* @returns Message observable
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*/
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function recv<T>(worker: Worker): Observable<T> {
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return fromEvent<MessageEvent<T>, T>(worker, "message", ev => ev.data)
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}
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/**
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* Create a subject for sending to a web worker
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*
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* @template T - Data type
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*
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* @param worker - Web worker
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*
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* @returns Message subject
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*/
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function send<T>(worker: Worker): Subject<T> {
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const send$ = new Subject<T>()
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send$.subscribe(data => worker.postMessage(data))
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/* Return message subject */
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return send$
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}
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/* ----------------------------------------------------------------------------
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* Functions
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* ------------------------------------------------------------------------- */
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/**
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* Create a bidirectional communication channel to a web worker
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*
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* @template T - Data type
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*
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* @param url - Worker URL
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* @param worker - Worker
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*
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* @returns Worker subject
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*/
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export function watchWorker<T extends WorkerMessage>(
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url: string, worker = new Worker(url)
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): Subject<T> {
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const recv$ = recv<T>(worker)
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const send$ = send<T>(worker)
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/* Create worker subject and forward messages */
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const worker$ = new Subject<T>()
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worker$.subscribe(send$)
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/* Return worker subject */
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const done$ = send$.pipe(ignoreElements(), endWith(true))
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return worker$
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.pipe(
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ignoreElements(),
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mergeWith(recv$.pipe(takeUntil(done$))),
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share()
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) as Subject<T>
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}
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