error dialog is deltachat-rpc-server is not found (#4479)

closes #4469

Author: Simon-Laux

Diff for: CHANGELOG.md

@@ -51,6 +51,7 @@
 - add show_app_in_chat option to webxdc info message context menu #4459
 - add experimental content protection option (to prevent screenshots and screenrecording the app) #4475
 - app picker for webxdc apps in attachement menu #4485
+- add special error dialog for the case that deltachat-rpc-server is not found #4479
 
 ### Changed
 - Update `@deltachat/stdio-rpc-server` and `deltachat/jsonrpc-client` to `1.154.1`

Diff for: packages/target-electron/src/deltachat/controller.ts

@@ -141,7 +141,7 @@ export default class DeltaChatController extends EventEmitter {
       serverPath
     )
 
-    await this.account_manager.start()
+    this.account_manager.start()
     log.info('HI')
 
     //todo? multiple instances, accounts is always writable

Diff for: packages/target-electron/src/deltachat/stdio_server.ts

@@ -3,6 +3,7 @@ import { ChildProcessWithoutNullStreams, spawn } from 'child_process'
 import { app, dialog } from 'electron/main'
 import { BuildInfo } from '../get-build-info'
 import { arch, platform } from 'os'
+import { getLogsPath } from '../application-constants'
 
 const log = getLogger('DC-RPC')
 
@@ -16,14 +17,50 @@ export class StdioServer {
     this.serverProcess = null
   }
 
-  async start() {
+  start() {
     this.serverProcess = spawn(this.cmd_path, {
       env: {
         DC_ACCOUNTS_PATH: this.accounts_path,
         RUST_LOG: process.env.RUST_LOG,
       },
     })
 
+    this.serverProcess.on('error', err => {
+      // The 'error' event is emitted whenever:
+      // - The process could not be spawned.
+      // - The process could not be killed.
+      // - Sending a message to the child process failed.
+      // - The child process was aborted via the signal option.
+      // ~ https://nodejs.org/api/child_process.html#event-error
+
+      if (err.message.endsWith('ENOENT')) {
+        dialog.showErrorBox(
+          'Fatal Error: Core Library Missing',
+          `The DeltaChat Module is missing! This could be due to your antivirus program. Please check the quarantine to restore it and notify the developers about this issue.
+You can reach us on [email protected] or on github.com/deltachat/deltachat-desktop/issues.
+
+The missing module should be located at "${this.cmd_path}".
+
+The Log file is located in this folder: ${getLogsPath()}
+--------------------
+Error: ${err.message}
+`
+        )
+      } else {
+        dialog.showErrorBox(
+          'Fatal Error',
+          `Error with core has been detected, please contact developers: You can reach us on [email protected] or on github.com/deltachat/deltachat-desktop/issues .
+
+          ${err.name}: ${err.message}
+
+          The Log file is located in this folder: ${getLogsPath()}\n
+          `
+        )
+      }
+      // I think we can exit in all the cases, because all errors here are serious
+      app.exit(1)
+    })
+
     let buffer = ''
     this.serverProcess.stdout.on('data', data => {
       // console.log(`stdout: ${data}`)

Diff for: packages/target-electron/src/ipc.ts

@@ -65,14 +65,16 @@ export async function init(cwd: string, logHandler: LogHandler) {
       error,
       dcController.rpcServerPath
     )
+
     dialog.showErrorBox(
       'Fatal Error',
       `The DeltaChat Module couldn't be loaded.
-Please check if all dependencies for deltachat-core are installed!
-The Log file is located in this folder: ${getLogsPath()}\n
-${dcController.rpcServerPath}\n
-${error instanceof Error ? error.message : inspect(error, { depth: null })}`
+  Please check if all dependencies for deltachat-core are installed!
+  The Log file is located in this folder: ${getLogsPath()}\n
+  ${dcController.rpcServerPath}\n
+  ${error instanceof Error ? error.message : inspect(error, { depth: null })}`
     )
+
     rawApp.exit(1)
   }