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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 { blobURLMap } from "./url.ts";
import { blobBytesWeakMap } from "./blob.ts";
*/
import { Event } from "./event.ts";
import { EventTarget } from "./event_target.ts";
const encoder = new TextEncoder();
const decoder = new TextDecoder();
function encodeMessage(data: any): Uint8Array {
const dataJson = JSON.stringify(data);
return encoder.encode(dataJson);
}
function decodeMessage(dataIntArray: Uint8Array): any {
const dataJson = decoder.decode(dataIntArray);
return JSON.parse(dataJson);
}
function createWorker(
specifier: string,
hasSourceCode: boolean,
sourceCode: Uint8Array
): { id: number; loaded: boolean } {
return sendSync(dispatch.OP_CREATE_WORKER, {
specifier,
hasSourceCode,
sourceCode: new TextDecoder().decode(sourceCode)
});
}
async function hostGetWorkerLoaded(id: number): Promise<any> {
return await sendAsync(dispatch.OP_HOST_GET_WORKER_LOADED, { id });
}
async function hostPollWorker(id: number): Promise<any> {
return await sendAsync(dispatch.OP_HOST_POLL_WORKER, { id });
}
function hostCloseWorker(id: number): void {
sendSync(dispatch.OP_HOST_CLOSE_WORKER, { id });
}
function hostResumeWorker(id: number): void {
sendSync(dispatch.OP_HOST_RESUME_WORKER, { 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;
}
}
export interface Worker {
onerror?: (e: any) => void;
onmessage?: (e: { data: any }) => void;
onmessageerror?: () => void;
postMessage(data: any): void;
}
export interface WorkerOptions {
type?: "classic" | "module";
}
export class WorkerImpl extends EventTarget implements Worker {
private readonly id: number;
private isClosing = false;
private messageBuffer: any[] = [];
private ready = false;
public onerror?: (e: any) => void;
public onmessage?: (data: any) => void;
public onmessageerror?: () => void;
constructor(specifier: string, options?: WorkerOptions) {
super();
let type = "classic";
if (options?.type) {
type = options.type;
}
if (type !== "module") {
throw new Error(
'Not yet implemented: only "module" type workers are supported'
);
}
const hasSourceCode = false;
const sourceCode = new Uint8Array();
/* TODO(bartlomieju):
// 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!;
}
*/
const { id, loaded } = createWorker(specifier, hasSourceCode, sourceCode);
this.id = id;
this.ready = loaded;
this.poll();
}
private handleError(e: any): boolean {
// TODO: this is being handled in a type unsafe way, it should be type safe
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const event = new Event("error", { cancelable: true }) as any;
event.message = e.message;
event.lineNumber = e.lineNumber ? e.lineNumber + 1 : null;
event.columnNumber = e.columnNumber ? e.columnNumber + 1 : null;
event.fileName = e.fileName;
event.error = null;
let handled = false;
if (this.onerror) {
this.onerror(event);
if (event.defaultPrevented) {
handled = true;
}
}
return handled;
}
async poll(): Promise<void> {
// If worker has not been immediately executed
// then let's await it's readiness
if (!this.ready) {
const result = await hostGetWorkerLoaded(this.id);
if (result.error) {
if (!this.handleError(result.error)) {
throw new Error(result.error.message);
}
return;
}
}
// drain messages
for (const data of this.messageBuffer) {
hostPostMessage(this.id, data);
}
this.messageBuffer = [];
this.ready = true;
this.run();
while (true) {
const result = await hostPollWorker(this.id);
if (result.error) {
if (!this.handleError(result.error)) {
throw Error(result.error.message);
} else {
hostResumeWorker(this.id);
}
} else {
this.isClosing = true;
hostCloseWorker(this.id);
break;
}
}
}
postMessage(data: any): void {
if (!this.ready) {
this.messageBuffer.push(data);
return;
}
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;
}
if (this.onmessage) {
const event = { data };
this.onmessage(event);
}
}
}
}
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