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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
// This module is the entry point for "worker" isolate, ie. the one
// that is created using `new Worker()` JS API.
//
// It provides a single function that should be called by Rust:
// - `bootstrapWorkerRuntime` - must be called once, when Isolate is created.
// It sets up runtime by providing globals for `DedicatedWorkerScope`.
/* eslint-disable @typescript-eslint/no-explicit-any */
import {
readOnly,
writable,
nonEnumerable,
windowOrWorkerGlobalScopeMethods,
windowOrWorkerGlobalScopeProperties,
eventTargetProperties,
setEventTargetData,
} from "./globals.ts";
import * as webWorkerOps from "./ops/web_worker.ts";
import { LocationImpl } from "./web/location.ts";
import { log, assert, immutableDefine } from "./util.ts";
import { MessageEvent, ErrorEvent } from "./web/workers.ts";
import { TextEncoder } from "./web/text_encoding.ts";
import * as runtime from "./runtime.ts";
const encoder = new TextEncoder();
// TODO(bartlomieju): remove these funtions
// Stuff for workers
export const onmessage: (e: { data: any }) => void = (): void => {};
export const onerror: (e: { data: any }) => void = (): void => {};
export function postMessage(data: any): void {
const dataJson = JSON.stringify(data);
const dataIntArray = encoder.encode(dataJson);
webWorkerOps.postMessage(dataIntArray);
}
let isClosing = false;
let hasBootstrapped = false;
export function close(): void {
if (isClosing) {
return;
}
isClosing = true;
webWorkerOps.close();
}
export async function workerMessageRecvCallback(data: string): Promise<void> {
const msgEvent = new MessageEvent("message", {
cancelable: false,
data,
});
try {
if (globalThis["onmessage"]) {
const result = globalThis.onmessage!(msgEvent);
if (result && "then" in result) {
await result;
}
}
globalThis.dispatchEvent(msgEvent);
} catch (e) {
let handled = false;
const errorEvent = new ErrorEvent("error", {
cancelable: true,
message: e.message,
lineno: e.lineNumber ? e.lineNumber + 1 : undefined,
colno: e.columnNumber ? e.columnNumber + 1 : undefined,
filename: e.fileName,
error: null,
});
if (globalThis["onerror"]) {
const ret = globalThis.onerror(
e.message,
e.fileName,
e.lineNumber,
e.columnNumber,
e
);
handled = ret === true;
}
globalThis.dispatchEvent(errorEvent);
if (errorEvent.defaultPrevented) {
handled = true;
}
if (!handled) {
throw e;
}
}
}
export const workerRuntimeGlobalProperties = {
self: readOnly(globalThis),
onmessage: writable(onmessage),
onerror: writable(onerror),
// TODO: should be readonly?
close: nonEnumerable(close),
postMessage: writable(postMessage),
workerMessageRecvCallback: nonEnumerable(workerMessageRecvCallback),
};
export function bootstrapWorkerRuntime(
name: string,
internalName?: string
): void {
if (hasBootstrapped) {
throw new Error("Worker runtime already bootstrapped");
}
log("bootstrapWorkerRuntime");
hasBootstrapped = true;
Object.defineProperties(globalThis, windowOrWorkerGlobalScopeMethods);
Object.defineProperties(globalThis, windowOrWorkerGlobalScopeProperties);
Object.defineProperties(globalThis, workerRuntimeGlobalProperties);
Object.defineProperties(globalThis, eventTargetProperties);
Object.defineProperties(globalThis, { name: readOnly(name) });
setEventTargetData(globalThis);
const s = runtime.start(internalName ?? name);
const location = new LocationImpl(s.location);
immutableDefine(globalThis, "location", location);
Object.freeze(globalThis.location);
// globalThis.Deno is not available in worker scope
delete globalThis.Deno;
assert(globalThis.Deno === undefined);
}
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