fix: forward log from electron to backend process

Otherwise log messages from the electron-main process will not be in
the log files when the app is running in production.

arduino-ide-extension/src/electron-main/theia/electron-main-application.ts

@@ -8,6 +8,7 @@ import {
 } from '@theia/core/electron-shared/electron';
 import { fork } from 'node:child_process';
 import { AddressInfo } from 'node:net';
+import { format as logFormat } from 'node:util';
 import { join, isAbsolute, resolve } from 'node:path';
 import { promises as fs, rm, rmSync } from 'node:fs';
 import type { MaybePromise, Mutable } from '@theia/core/lib/common/types';
@@ -39,6 +40,7 @@ import {
   CHANNEL_SHOW_PLOTTER_WINDOW,
   isShowPlotterWindowParams,
 } from '../../electron-common/electron-arduino';
+import { ChildProcess } from 'child_process';
 
 app.commandLine.appendSwitch('disable-http-cache');
 
@@ -493,6 +495,11 @@ export class ElectronMainApplication extends TheiaElectronMainApplication {
         args,
         await this.getForkOptions()
       );
+      // In production, the electron main's `console` must be rebind, and delegate all log messages to the Theia backend via IPC.
+      // Otherwise, any error that happens in this process won't be in the log files.
+      if (!environment.electron.isDevMode()) {
+        forwardConsoleTo(backendProcess);
+      }
       console.log(`Starting backend process. PID: ${backendProcess.pid}`);
       return new Promise((resolve, reject) => {
         // The backend server main file is also supposed to send the resolved http(s) server port via IPC.
@@ -777,3 +784,26 @@ function updateAppInfo(
   });
   return toUpdate;
 }
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+type ConsoleLogFunction = (message?: any, ...optionalParams: any[]) => void;
+const consoleLogFunctionNames = [
+  'log',
+  'trace',
+  'debug',
+  'info',
+  'warn',
+  'error',
+] as const;
+function forwardConsoleTo(child: ChildProcess) {
+  for (const name of consoleLogFunctionNames) {
+    const original = <ConsoleLogFunction>console[name as keyof Console];
+    console[name] = function () {
+      // eslint-disable-next-line prefer-rest-params
+      const messages = Object.values(arguments);
+      const message = logFormat(...messages);
+      child.send({ severity: name, message });
+      original(message);
+    };
+  }
+}

electron-app/arduino-ide-backend-main.js

@@ -33,6 +33,24 @@ function enableFileLogger() {
       log(message);
     };
   }
+
+  function forward(message) {
+    if (
+      Boolean(message) &&
+      typeof message === 'object' &&
+      'severity' in message &&
+      'message' in message
+    ) {
+      const severity = message.severity;
+      const logMessage = message.message;
+      const logFunction = console[severity];
+      if (typeof logFunction === 'function' && typeof logMessage === 'string') {
+        logFunction(logMessage);
+      }
+    }
+  }
+
+  process.on('message', forward);
 }
 
 if (process.env.IDE2_FILE_LOGGER === 'true') {