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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
/* eslint-disable @typescript-eslint/no-explicit-any */
import * as dispatch from "./dispatch.ts";
import { sendAsync, sendSync } from "./dispatch_json.ts";
import { log } from "./util.ts";
import { TextDecoder, TextEncoder } from "./text_encoding.ts";
import { window } from "./window.ts";
import { blobURLMap } from "./url.ts";
import { blobBytesWeakMap } from "./blob.ts";
const encoder = new TextEncoder();
const decoder = new TextDecoder();
export function encodeMessage(data: any): Uint8Array {
const dataJson = JSON.stringify(data);
return encoder.encode(dataJson);
}
export function decodeMessage(dataIntArray: Uint8Array): any {
const dataJson = decoder.decode(dataIntArray);
return JSON.parse(dataJson);
}
function createWorker(
specifier: string,
includeDenoNamespace: boolean,
hasSourceCode: boolean,
sourceCode: Uint8Array
): number {
return sendSync(dispatch.OP_CREATE_WORKER, {
specifier,
includeDenoNamespace,
hasSourceCode,
sourceCode: new TextDecoder().decode(sourceCode)
});
}
async function hostGetWorkerClosed(id: number): Promise<void> {
await sendAsync(dispatch.OP_HOST_GET_WORKER_CLOSED, { id });
}
function hostPostMessage(id: number, data: any): void {
const dataIntArray = encodeMessage(data);
sendSync(dispatch.OP_HOST_POST_MESSAGE, { id }, dataIntArray);
}
async function hostGetMessage(id: number): Promise<any> {
const res = await sendAsync(dispatch.OP_HOST_GET_MESSAGE, { id });
if (res.data != null) {
return decodeMessage(new Uint8Array(res.data));
} else {
return null;
}
}
// Stuff for workers
export const onmessage: (e: { data: any }) => void = (): void => {};
export function postMessage(data: any): void {
const dataIntArray = encodeMessage(data);
sendSync(dispatch.OP_WORKER_POST_MESSAGE, {}, dataIntArray);
}
export async function getMessage(): Promise<any> {
log("getMessage");
const res = await sendAsync(dispatch.OP_WORKER_GET_MESSAGE);
if (res.data != null) {
return decodeMessage(new Uint8Array(res.data));
} else {
return null;
}
}
export let isClosing = false;
export function workerClose(): void {
isClosing = true;
}
export async function workerMain(): Promise<void> {
log("workerMain");
while (!isClosing) {
const data = await getMessage();
if (data == null) {
log("workerMain got null message. quitting.");
break;
}
if (window["onmessage"]) {
const event = { data };
const result: void | Promise<void> = window.onmessage(event);
if (result && "then" in result) {
await result;
}
}
if (!window["onmessage"]) {
break;
}
}
}
export interface Worker {
onerror?: () => void;
onmessage?: (e: { data: any }) => void;
onmessageerror?: () => void;
postMessage(data: any): void;
closed: Promise<void>;
}
// TODO(kevinkassimo): Maybe implement reasonable web worker options?
// eslint-disable-next-line @typescript-eslint/no-empty-interface
export interface WorkerOptions {}
/** Extended Deno Worker initialization options.
* `noDenoNamespace` hides global `window.Deno` namespace for
* spawned worker and nested workers spawned by it (default: false).
*/
export interface DenoWorkerOptions extends WorkerOptions {
noDenoNamespace?: boolean;
}
export class WorkerImpl implements Worker {
private readonly id: number;
private isClosing = false;
private readonly isClosedPromise: Promise<void>;
public onerror?: () => void;
public onmessage?: (data: any) => void;
public onmessageerror?: () => void;
constructor(specifier: string, options?: DenoWorkerOptions) {
let hasSourceCode = false;
let sourceCode = new Uint8Array();
let includeDenoNamespace = true;
if (options && options.noDenoNamespace) {
includeDenoNamespace = false;
}
// Handle blob URL.
if (specifier.startsWith("blob:")) {
hasSourceCode = true;
const b = blobURLMap.get(specifier);
if (!b) {
throw new Error("No Blob associated with the given URL is found");
}
const blobBytes = blobBytesWeakMap.get(b!);
if (!blobBytes) {
throw new Error("Invalid Blob");
}
sourceCode = blobBytes!;
}
this.id = createWorker(
specifier,
includeDenoNamespace,
hasSourceCode,
sourceCode
);
this.run();
this.isClosedPromise = hostGetWorkerClosed(this.id);
this.isClosedPromise.then((): void => {
this.isClosing = true;
});
}
get closed(): Promise<void> {
return this.isClosedPromise;
}
postMessage(data: any): void {
hostPostMessage(this.id, data);
}
private async run(): Promise<void> {
while (!this.isClosing) {
const data = await hostGetMessage(this.id);
if (data == null) {
log("worker got null message. quitting.");
break;
}
// TODO(afinch7) stop this from eating messages before onmessage has been assigned
if (this.onmessage) {
const event = { data };
this.onmessage(event);
}
}
}
}
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