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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
/* eslint-disable @typescript-eslint/no-explicit-any */
import { sendAsync, sendSync } from "./dispatch";
import * as msg from "gen/cli/msg_generated";
import * as flatbuffers from "./flatbuffers";
import { assert, log } from "./util";
import { TextDecoder, TextEncoder } from "./text_encoding";
import { window } from "./window";
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): number {
const builder = flatbuffers.createBuilder();
const specifier_ = builder.createString(specifier);
const inner = msg.CreateWorker.createCreateWorker(builder, specifier_);
const baseRes = sendSync(builder, msg.Any.CreateWorker, inner);
assert(baseRes != null);
assert(
msg.Any.CreateWorkerRes === baseRes!.innerType(),
`base.innerType() unexpectedly is ${baseRes!.innerType()}`
);
const res = new msg.CreateWorkerRes();
assert(baseRes!.inner(res) != null);
return res.rid();
}
async function hostGetWorkerClosed(rid: number): Promise<void> {
const builder = flatbuffers.createBuilder();
const inner = msg.HostGetWorkerClosed.createHostGetWorkerClosed(builder, rid);
await sendAsync(builder, msg.Any.HostGetWorkerClosed, inner);
}
function hostPostMessage(rid: number, data: any): void {
const dataIntArray = encodeMessage(data);
const builder = flatbuffers.createBuilder();
const inner = msg.HostPostMessage.createHostPostMessage(builder, rid);
const baseRes = sendSync(
builder,
msg.Any.HostPostMessage,
inner,
dataIntArray
);
assert(baseRes != null);
}
async function hostGetMessage(rid: number): Promise<any> {
const builder = flatbuffers.createBuilder();
const inner = msg.HostGetMessage.createHostGetMessage(builder, rid);
const baseRes = await sendAsync(builder, msg.Any.HostGetMessage, inner);
assert(baseRes != null);
assert(
msg.Any.HostGetMessageRes === baseRes!.innerType(),
`base.innerType() unexpectedly is ${baseRes!.innerType()}`
);
const res = new msg.HostGetMessageRes();
assert(baseRes!.inner(res) != null);
const dataArray = res.dataArray();
if (dataArray != null) {
return decodeMessage(dataArray);
} else {
return null;
}
}
// Stuff for workers
export let onmessage: (e: { data: any }) => void = (): void => {};
export function postMessage(data: any): void {
const dataIntArray = encodeMessage(data);
const builder = flatbuffers.createBuilder();
const inner = msg.WorkerPostMessage.createWorkerPostMessage(builder);
const baseRes = sendSync(
builder,
msg.Any.WorkerPostMessage,
inner,
dataIntArray
);
assert(baseRes != null);
}
export async function getMessage(): Promise<any> {
log("getMessage");
const builder = flatbuffers.createBuilder();
const inner = msg.WorkerGetMessage.createWorkerGetMessage(
builder,
0 /* unused */
);
const baseRes = await sendAsync(builder, msg.Any.WorkerGetMessage, inner);
assert(baseRes != null);
assert(
msg.Any.WorkerGetMessageRes === baseRes!.innerType(),
`base.innerType() unexpectedly is ${baseRes!.innerType()}`
);
const res = new msg.WorkerGetMessageRes();
assert(baseRes!.inner(res) != null);
const dataArray = res.dataArray();
if (dataArray != null) {
return decodeMessage(dataArray);
} 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 };
window.onmessage(event);
}
if (!window["onmessage"]) {
break;
}
}
}
export interface Worker {
onerror?: () => void;
onmessage?: (e: { data: any }) => void;
onmessageerror?: () => void;
postMessage(data: any): void;
closed: Promise<void>;
}
export class WorkerImpl implements Worker {
private readonly rid: number;
private isClosing: boolean = false;
private readonly isClosedPromise: Promise<void>;
public onerror?: () => void;
public onmessage?: (data: any) => void;
public onmessageerror?: () => void;
constructor(specifier: string) {
this.rid = createWorker(specifier);
this.run();
this.isClosedPromise = hostGetWorkerClosed(this.rid);
this.isClosedPromise.then(
(): void => {
this.isClosing = true;
}
);
}
get closed(): Promise<void> {
return this.isClosedPromise;
}
postMessage(data: any): void {
hostPostMessage(this.rid, data);
}
private async run(): Promise<void> {
while (!this.isClosing) {
const data = await hostGetMessage(this.rid);
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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