Fix Flipper lints #18

Summary: Fixed several lint errors mainly related to Warning/node/no-sync.

Reviewed By: passy

Differential Revision: D31795894

fbshipit-source-id: 020597d93232a8e84b25ea11a87d9481a6d2616f

desktop/static/launcher.ts

@@ -10,7 +10,6 @@
 import os from 'os';
 import fs from 'fs';
 import path from 'path';
-import {promisify} from 'util';
 import {spawn} from 'child_process';
 import xdg from 'xdg-basedir';
 import mkdirp from 'mkdirp';
@@ -18,14 +17,19 @@ import mkdirp from 'mkdirp';
 const isProduction = () =>
   !/node_modules[\\/]electron[\\/]/.test(process.execPath);
 
-const isLauncherInstalled = () => {
+const isLauncherInstalled = async () => {
   if (os.type() == 'Darwin') {
     const receipt = 'com.facebook.flipper.launcher';
     const plistLocation = '/Applications/Flipper.app/Contents/Info.plist';
+    try {
       return (
-      fs.existsSync(plistLocation) &&
-      fs.readFileSync(plistLocation).indexOf(receipt) > 0
+        (await fs.promises.stat(plistLocation)) &&
+        (await fs.promises.readFile(plistLocation)).indexOf(receipt) > 0
       );
+    } catch (e) {
+      console.error('Error while reading Info.plist', e);
+      return false;
+    }
   }
 
   return false;
@@ -54,17 +58,14 @@ const checkIsCycle = async () => {
 
   let backThen;
   try {
-    backThen = parseInt(
-      (await promisify(fs.readFile)(filePath)).toString(),
-      10,
-    );
+    backThen = parseInt((await fs.promises.readFile(filePath)).toString(), 10);
   } catch (e) {
     backThen = 0;
   }
 
   const delta = rightNow - backThen;
   await mkdirp(dir);
-  await promisify(fs.writeFile)(filePath, '' + rightNow);
+  await fs.promises.writeFile(filePath, '' + rightNow);
 
   // If the last startup was less than 5s ago, something's not okay.
   return Math.abs(delta) < 5000;
@@ -79,7 +80,7 @@ export default async function delegateToLauncher(argv: {
   file?: string;
   url?: string;
 }) {
-  if (argv.launcher && isProduction() && isLauncherInstalled()) {
+  if (argv.launcher && isProduction() && (await isLauncherInstalled())) {
     if (await checkIsCycle()) {
       console.error(
         'Launcher cycle detected. Not delegating even though I usually would.',

desktop/static/main.ts

@@ -26,7 +26,7 @@ import url from 'url';
 import fs from 'fs';
 import fixPath from 'fix-path';
 import {exec} from 'child_process';
-import setup from './setup';
+import setup, {Config, configPath} from './setup';
 import isFB from './fb-stubs/isFB';
 import delegateToLauncher from './launcher';
 import yargs from 'yargs';
@@ -99,8 +99,6 @@ const argv = yargs
   .help()
   .parse(process.argv.slice(1));
 
-const {config, configPath} = setup(argv);
-
 if (isFB && process.env.FLIPPER_FB === undefined) {
   process.env.FLIPPER_FB = 'true';
 }
@@ -110,11 +108,6 @@ if (argv['disable-gpu'] || process.env.FLIPPER_DISABLE_GPU === '1') {
   app.disableHardwareAcceleration();
 }
 
-process.env.CONFIG = JSON.stringify(config);
-nativeTheme.themeSource = validThemes.includes(config.darkMode)
-  ? config.darkMode
-  : 'light';
-
 // possible reference to main app window
 let win: BrowserWindow;
 let appReady = false;
@@ -178,9 +171,13 @@ app.on('will-finish-launching', () => {
   });
 });
 
-app.on('ready', () => {
+app.on('ready', async () => {
+  const config = await setup(argv);
+  processConfig(config);
+
   // If we delegate to the launcher, shut down this instance of the app.
-  delegateToLauncher(argv).then(async (hasLauncherInvoked: boolean) => {
+  delegateToLauncher(argv)
+    .then(async (hasLauncherInvoked: boolean) => {
       if (hasLauncherInvoked) {
         app.quit();
         return;
@@ -188,7 +185,8 @@ app.on('ready', () => {
       appReady = true;
       app.commandLine.appendSwitch('scroll-bounce');
       configureSession();
-    createWindow();
+      createWindow(config);
+
       // if in development install the react devtools extension
       if (process.env.NODE_ENV === 'development') {
         const {
@@ -202,11 +200,13 @@ app.on('ready', () => {
           console.log('Force updating DevTools');
         }
         // Redux
+        try {
           await installExtension(REDUX_DEVTOOLS.id, {
             loadExtensionOptions: {allowFileAccess: true, forceDownload},
-      }).catch((e: any) => {
-        console.error('Failed to install Redux devtools extension', e);
           });
+        } catch (e) {
+          console.error('Failed to install Redux devtools extension', e);
+        }
         // React
         // Fix for extension loading (see D27685981)
         // Work around per https://github.com/electron/electron/issues/23662#issuecomment-787420799
@@ -215,24 +215,27 @@ app.on('ready', () => {
         }`;
         if (await promisify(fs.exists)(reactDevToolsPath)) {
           console.log('Loading React devtools from disk ' + reactDevToolsPath);
-        await session.defaultSession
-          .loadExtension(
+          try {
+            await session.defaultSession.loadExtension(
               reactDevToolsPath,
               // @ts-ignore only supported (and needed) in Electron 12
               {allowFileAccess: true},
-          )
-          .catch((e) => {
+            );
+          } catch (e) {
             console.error('Failed to loa React devtools from disk: ', e);
-          });
+          }
         } else {
+          try {
             await installExtension(REACT_DEVELOPER_TOOLS.id, {
               loadExtensionOptions: {allowFileAccess: true, forceDownload},
-        }).catch((e: any) => {
+            });
+          } catch (e) {
             console.error('Failed to install React devtools extension', e);
-        });
           }
         }
-  });
+      }
+    })
+    .catch((e: any) => console.error('Error while delegating app launch', e));
 });
 
 app.on('web-contents-created', (_event, contents) => {
@@ -340,7 +343,7 @@ app.setAsDefaultProtocolClient('flipper');
 // is workaround suggested in the issue
 app.commandLine.appendSwitch('disable-features', 'OutOfBlinkCors');
 
-function createWindow() {
+function createWindow(config: Config) {
   win = new BrowserWindow({
     show: false,
     title: 'Flipper',
@@ -384,7 +387,8 @@ function createWindow() {
     const [x, y] = win.getPosition();
     const [width, height] = win.getSize();
     // save window position and size
-    fs.writeFileSync(
+
+    fs.writeFile(
       configPath,
       JSON.stringify({
         ...config,
@@ -396,6 +400,11 @@ function createWindow() {
           height,
         },
       }),
+      (err) => {
+        if (err) {
+          console.error('Error while saving window position/size', err);
+        }
+      },
     );
   });
   if (
@@ -414,3 +423,10 @@ function createWindow() {
     });
   win.loadURL(entryUrl);
 }
+
+function processConfig(config: Config) {
+  process.env.CONFIG = JSON.stringify(config);
+  nativeTheme.themeSource = validThemes.includes(config.darkMode)
+    ? config.darkMode
+    : 'light';
+}

desktop/static/setup.ts

@@ -11,6 +11,14 @@ import path from 'path';
 import os from 'os';
 import fs from 'fs';
 
+const flipperHomeDir = path.join(os.homedir(), '.flipper');
+export const configPath = path.join(flipperHomeDir, 'config.json');
+export const defaultConfig: Config = {
+  pluginPaths: [],
+  disabledPlugins: [],
+  darkMode: 'light',
+};
+
 export type Config = {
   pluginPaths?: string[];
   disabledPlugins?: string[];
@@ -27,31 +35,41 @@ export type Config = {
   darkMode: 'system' | 'light' | 'dark';
 };
 
-export default function setup(argv: any) {
-  // ensure .flipper folder and config exist
-  const flipperDir = path.join(os.homedir(), '.flipper');
-  if (!fs.existsSync(flipperDir)) {
-    fs.mkdirSync(flipperDir);
+const ensureConfigDirExists = async (path: fs.PathLike) => {
+  try {
+    await fs.promises.access(path);
+  } catch (e) {
+    console.warn('Config directory not found, creating config directory.');
+    try {
+      await fs.promises.mkdir(path);
+    } catch (e) {
+      console.error('Failed to create config directory', e);
     }
+  }
+};
 
-  const configPath = path.join(flipperDir, 'config.json');
-  let config: Config = {
-    pluginPaths: [],
-    disabledPlugins: [],
-    darkMode: 'light',
-  };
+const readConfigFile = async (configPath: fs.PathLike) => {
+  let config = defaultConfig;
 
   try {
     config = {
       ...config,
-      ...JSON.parse(fs.readFileSync(configPath).toString()),
+      ...JSON.parse((await fs.promises.readFile(configPath)).toString()),
     };
   } catch (e) {
     // file not readable or not parsable, overwrite it with the new config
     console.warn(`Failed to read ${configPath}: ${e}`);
     console.info('Writing new default config.');
-    fs.writeFileSync(configPath, JSON.stringify(config));
+    await fs.promises.writeFile(configPath, JSON.stringify(config));
   }
+  return config;
+};
+
+export default async function setup(argv: any) {
+  // ensure .flipper folder and config exist
+  await ensureConfigDirExists(flipperHomeDir);
+
+  let config = await readConfigFile(configPath);
 
   // Non-persistent CLI arguments.
   config = {
@@ -67,5 +85,5 @@ export default function setup(argv: any) {
     launcherMsg: argv.launcherMsg,
   };
 
-  return {config, configPath};
+  return config;
 }