Move arrpc server into a worker thread to reduce stutters (#1053)

Co-authored-by: V <vendicated@riseup.net>

src/main/arrpc/index.ts

@@ -0,0 +1,83 @@
+/*
+ * Vesktop, a desktop app aiming to give you a snappier Discord Experience
+ * Copyright (c) 2023 Vendicated and Vencord contributors
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+import { resolve } from "path";
+import { IpcCommands } from "shared/IpcEvents";
+import { MessageChannel, Worker } from "worker_threads";
+
+import { sendRendererCommand } from "../ipcCommands";
+import { Settings } from "../settings";
+import { ArRpcEvent, ArRpcHostEvent } from "./types";
+
+let worker: Worker;
+
+const inviteCodeRegex = /^(\w|-)+$/;
+
+export async function initArRPC() {
+    if (worker || !Settings.store.arRPC) return;
+
+    try {
+        const { port1: hostPort, port2: workerPort } = new MessageChannel();
+
+        worker = new Worker(resolve(__dirname, "./arRpcWorker.js"), {
+            workerData: {
+                workerPort
+            },
+            transferList: [workerPort]
+        });
+
+        hostPort.on("message", async (e: ArRpcEvent) => {
+            switch (e.type) {
+                case "activity": {
+                    sendRendererCommand(IpcCommands.RPC_ACTIVITY, e.data);
+                    break;
+                }
+
+                case "invite": {
+                    const invite = String(e.data);
+
+                    const response: ArRpcHostEvent = {
+                        type: "ack-invite",
+                        nonce: e.nonce,
+                        data: false
+                    };
+
+                    if (!inviteCodeRegex.test(invite)) {
+                        return hostPort.postMessage(response);
+                    }
+
+                    response.data = await sendRendererCommand(IpcCommands.RPC_INVITE, invite).catch(() => false);
+
+                    hostPort.postMessage(response);
+                    break;
+                }
+
+                case "link": {
+                    const link = String(e.data);
+
+                    const response: ArRpcHostEvent = {
+                        type: "ack-link",
+                        nonce: e.nonce,
+                        data: false
+                    };
+
+                    if (!inviteCodeRegex.test(link)) {
+                        return hostPort.postMessage(response);
+                    }
+
+                    response.data = await sendRendererCommand(IpcCommands.RPC_DEEP_LINK, link).catch(() => false);
+
+                    hostPort.postMessage(response);
+                    break;
+                }
+            }
+        });
+    } catch (e) {
+        console.error("Failed to start arRPC server", e);
+    }
+}
+
+Settings.addChangeListener("arRPC", initArRPC);