Fetch settings directly from filesystem on launch (wavetermdev#855)

This bypasses the Go backend when fetching the settings for the app on first launch. This allows for actions that need to be performed before the app is ready, such as disabling hardware acceleration.

Author: esimkowitz

emain/emain.ts

@@ -21,6 +21,7 @@ import * as keyutil from "../frontend/util/keyutil";
 import { fireAndForget } from "../frontend/util/util";
 import { AuthKey, AuthKeyEnv, configureAuthKeyRequestInjection } from "./authkey";
 import { ElectronWshClient, initElectronWshClient } from "./emain-wsh";
+import { getLaunchSettings } from "./launchsettings";
 import { getAppMenu } from "./menu";
 import {
     getElectronAppBasePath,
@@ -840,6 +841,13 @@ process.on("uncaughtException", (error) => {
 });
 
 async function appMain() {
+    // Set disableHardwareAcceleration as early as possible, if required.
+    const launchSettings = getLaunchSettings();
+    if (launchSettings?.["window:disablehardwareacceleration"]) {
+        console.log("disabling hardware acceleration, per launch settings");
+        electronApp.disableHardwareAcceleration();
+    }
+
     const startTs = Date.now();
     const instanceLock = electronApp.requestSingleInstanceLock();
     if (!instanceLock) {
@@ -852,22 +860,13 @@ async function appMain() {
         fs.mkdirSync(waveHomeDir);
     }
     makeAppMenu();
-
     try {
         await runWaveSrv();
     } catch (e) {
         console.log(e.toString());
     }
     const ready = await waveSrvReady;
     console.log("wavesrv ready signal received", ready, Date.now() - startTs, "ms");
-
-    const fullConfig = await services.FileService.GetFullConfig();
-    const settings = fullConfig.settings;
-    if (settings?.["window:disablehardwareacceleration"]) {
-        console.log("disabling hardware acceleration");
-        electronApp.disableHardwareAcceleration();
-    }
-
     await electronApp.whenReady();
     configureAuthKeyRequestInjection(electron.session.defaultSession);
     await relaunchBrowserWindows();

emain/launchsettings.ts

@@ -0,0 +1,18 @@
+import fs from "fs";
+import path from "path";
+import { getWaveHomeDir } from "./platform";
+
+/**
+ * Get settings directly from the Wave Home directory on launch.
+ * Only use this when the app is first starting up. Otherwise, prefer the settings.GetFullConfig function.
+ * @returns The initial launch settings for the application.
+ */
+export function getLaunchSettings(): SettingsType {
+    const settingsPath = path.join(getWaveHomeDir(), "config", "settings.json");
+    try {
+        const settingsContents = fs.readFileSync(settingsPath, "utf8");
+        return JSON.parse(settingsContents);
+    } catch (e) {
+        console.error("Unable to load settings.json to get initial launch settings", e);
+    }
+}