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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
/* eslint-disable @typescript-eslint/no-explicit-any */
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,
name?: string
): { id: number } {
return sendSync("op_create_worker", {
specifier,
hasSourceCode,
sourceCode: new TextDecoder().decode(sourceCode),
name
});
}
function hostTerminateWorker(id: number): void {
sendSync("op_host_terminate_worker", { id });
}
function hostPostMessage(id: number, data: any): void {
const dataIntArray = encodeMessage(data);
sendSync("op_host_post_message", { id }, dataIntArray);
}
interface WorkerEvent {
event: "error" | "msg" | "close";
data?: any;
error?: any;
}
async function hostGetMessage(id: number): Promise<any> {
return await sendAsync("op_host_get_message", { id });
}
export interface Worker {
onerror?: (e: any) => void;
onmessage?: (e: { data: any }) => void;
onmessageerror?: () => void;
postMessage(data: any): void;
terminate(): void;
}
export interface WorkerOptions {
type?: "classic" | "module";
name?: string;
}
export class WorkerImpl extends EventTarget implements Worker {
private readonly id: number;
private isClosing = false;
public onerror?: (e: any) => void;
public onmessage?: (data: any) => void;
public onmessageerror?: () => void;
private name: string;
private terminated = false;
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'
);
}
this.name = options?.name ?? "unknown";
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 } = createWorker(
specifier,
hasSourceCode,
sourceCode,
options?.name
);
this.id = id;
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> {
while (!this.terminated) {
const event = await hostGetMessage(this.id);
// If terminate was called then we ignore all messages
if (this.terminated) {
return;
}
const type = event.type;
if (type === "msg") {
if (this.onmessage) {
const message = decodeMessage(new Uint8Array(event.data));
this.onmessage({ data: message });
}
continue;
}
if (type === "error") {
if (!this.handleError(event.error)) {
throw Error(event.error.message);
}
continue;
}
if (type === "close") {
log(`Host got "close" message from worker: ${this.name}`);
this.terminated = true;
return;
}
throw new Error(`Unknown worker event: "${type}"`);
}
}
postMessage(data: any): void {
if (this.terminated) {
return;
}
hostPostMessage(this.id, data);
}
terminate(): void {
if (!this.terminated) {
this.terminated = true;
hostTerminateWorker(this.id);
}
}
}
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