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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
((window) => {
const core = window.Deno.core;
const { Window } = window.__bootstrap.globalInterfaces;
const { log } = window.__bootstrap.util;
const { defineEventHandler } = window.__bootstrap.webUtil;
function createWorker(
specifier,
hasSourceCode,
sourceCode,
useDenoNamespace,
name,
) {
return core.jsonOpSync("op_create_worker", {
specifier,
hasSourceCode,
sourceCode,
name,
useDenoNamespace,
});
}
function hostTerminateWorker(id) {
core.jsonOpSync("op_host_terminate_worker", { id });
}
function hostPostMessage(id, data) {
core.jsonOpSync("op_host_post_message", { id }, data);
}
function hostGetMessage(id) {
return core.jsonOpAsync("op_host_get_message", { id });
}
const encoder = new TextEncoder();
const decoder = new TextDecoder();
function encodeMessage(data) {
const dataJson = JSON.stringify(data);
return encoder.encode(dataJson);
}
function decodeMessage(dataIntArray) {
const dataJson = decoder.decode(dataIntArray);
return JSON.parse(dataJson);
}
class Worker extends EventTarget {
#id = 0;
#name = "";
#terminated = false;
constructor(specifier, options) {
super();
const { type = "classic", name = "unknown" } = options ?? {};
if (type !== "module") {
throw new Error(
'Not yet implemented: only "module" type workers are supported',
);
}
this.#name = name;
const hasSourceCode = false;
const sourceCode = decoder.decode(new Uint8Array());
const useDenoNamespace = options ? !!options.deno : false;
const { id } = createWorker(
specifier,
hasSourceCode,
sourceCode,
useDenoNamespace,
options?.name,
);
this.#id = id;
this.#poll();
}
#handleMessage = (msgData) => {
let data;
try {
data = decodeMessage(new Uint8Array(msgData));
} catch (e) {
const msgErrorEvent = new MessageEvent("messageerror", {
cancelable: false,
data,
});
return;
}
const msgEvent = new MessageEvent("message", {
cancelable: false,
data,
});
this.dispatchEvent(msgEvent);
};
#handleError = (e) => {
const event = 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,
});
let handled = false;
this.dispatchEvent(event);
if (event.defaultPrevented) {
handled = true;
}
return handled;
};
#poll = async () => {
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 === "terminalError") {
this.#terminated = true;
if (!this.#handleError(event.error)) {
if (globalThis instanceof Window) {
throw new Error("Unhandled error event reached main worker.");
} else {
core.jsonOpSync(
"op_host_unhandled_error",
{ message: event.error.message },
);
}
}
continue;
}
if (type === "msg") {
this.#handleMessage(event.data);
continue;
}
if (type === "error") {
if (!this.#handleError(event.error)) {
if (globalThis instanceof Window) {
throw new Error("Unhandled error event reached main worker.");
} else {
core.jsonOpSync(
"op_host_unhandled_error",
{ message: 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(message, transferOrOptions) {
if (transferOrOptions) {
throw new Error(
"Not yet implemented: `transfer` and `options` are not supported.",
);
}
if (this.#terminated) {
return;
}
hostPostMessage(this.#id, encodeMessage(message));
}
terminate() {
if (!this.#terminated) {
this.#terminated = true;
hostTerminateWorker(this.#id);
}
}
}
defineEventHandler(Worker.prototype, "error");
defineEventHandler(Worker.prototype, "message");
defineEventHandler(Worker.prototype, "messageerror");
window.__bootstrap.worker = {
Worker,
};
})(this);
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