telegram

mnemo_cards_telegram_bot/Dockerfile

@@ -56,6 +56,9 @@ ENV BACKEND_URL=https://api.mnemo-cards.online \
 
 # No EXPOSE needed - bot uses outbound connections only (polling)
 
+# Signal for graceful shutdown
+STOPSIGNAL SIGTERM
+
 # Healthcheck - check if process is running
 HEALTHCHECK --interval=30s --timeout=5s --retries=3 --start-period=10s \
   CMD pgrep -f "/app/bot" > /dev/null || exit 1

mnemo_cards_telegram_bot/bin/main.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:io';
 import 'package:path/path.dart';
 import 'package:mnemo_cards_telegram_bot/bot_config.dart';
@@ -10,10 +11,65 @@ import 'package:mnemo_cards_telegram_bot/backend_client.dart';
 
 const String version = '0.0.1';
 
+// Global variables for graceful shutdown
+BackendClient? _globalBackendClient;
+TeleDart? _globalTeledart;
+bool _isShuttingDown = false;
+final Completer<void> _shutdownCompleter = Completer<void>();
+
 void main() async {
+  // Setup signal handlers for graceful shutdown
+  ProcessSignal.sigterm.watch().listen((signal) {
+    print('[BOT] Received SIGTERM, shutting down gracefully...');
+    _shutdown();
+  });
+  
+  ProcessSignal.sigint.watch().listen((signal) {
+    print('[BOT] Received SIGINT, shutting down gracefully...');
+    _shutdown();
+  });
+
   return _run();
 }
 
+Future<void> _shutdown() async {
+  if (_isShuttingDown) {
+    print('[BOT] Shutdown already in progress');
+    return;
+  }
+  _isShuttingDown = true;
+
+  print('[BOT] Starting graceful shutdown...');
+  
+  try {
+    if (_globalTeledart != null) {
+      print('[BOT] Stopping TeleDart...');
+      // TeleDart doesn't have explicit stop method, but we can dispose resources
+      // The process will exit naturally when main completes
+    }
+  } catch (e) {
+    print('[BOT] Error stopping TeleDart: $e');
+  }
+
+  try {
+    if (_globalBackendClient != null) {
+      print('[BOT] Disposing BackendClient...');
+      _globalBackendClient!.dispose();
+    }
+  } catch (e) {
+    print('[BOT] Error disposing BackendClient: $e');
+  }
+
+  print('[BOT] Shutdown complete');
+  
+  // Complete the completer to allow main to exit
+  if (!_shutdownCompleter.isCompleted) {
+    _shutdownCompleter.complete();
+  }
+  
+  exit(0);
+}
+
 String? _extractCodeFromText(String? rawText) {
   if (rawText == null) {
     return null;
@@ -92,6 +148,11 @@ Future<void> _handleCodeClaim({
 }
 
 Future<void> _run() async {
+  if (_isShuttingDown) {
+    print('[BOT] Shutdown in progress, not starting bot');
+    return;
+  }
+
   print('[BOT] Starting bot version $version');
   BackendClient? backendClient;
   TeleDart? teledart;
@@ -109,6 +170,9 @@ Future<void> _run() async {
 
     final username = (await Telegram(config.botToken).getMe()).username;
     teledart = TeleDart(config.botToken, Event(username!));
+    
+    // Store globally for shutdown handler
+    _globalTeledart = teledart;
 
     Future<void> notifyAdmins(String message) async {
       for (final admin in adminIds) {
@@ -126,6 +190,9 @@ Future<void> _run() async {
       backendUrl: config.backendUrl,
       apiKey: config.apiKey,
     );
+    
+    // Store globally for shutdown handler
+    _globalBackendClient = backendClient;
 
     // At this point all variables are initialized and non-null
     final teledartInstance = teledart;
@@ -587,7 +654,16 @@ Future<void> _run() async {
 
     teledartInstance.start();
     print('[BOT] Bot started successfully');
+    
+    // Wait for shutdown signal
+    // The bot will run until it receives SIGTERM/SIGINT
+    await _shutdownCompleter.future;
   } on Exception catch (e, s) {
+    if (_isShuttingDown) {
+      print('[BOT] Error during shutdown, exiting...');
+      return;
+    }
+    
     print('[BOT] ERROR: Error: $e\n$s');
     print('[BOT] Error while starting bot: $e');
     print('Stack trace: $s');
@@ -598,16 +674,17 @@ Future<void> _run() async {
     print('  - BACKEND_URL or MNEMO_BACKEND_URL (optional, default: https://api.mnemo-cards.online)');
     print('  - BOT_SHARE_DAILY_LIMIT (optional, default: 1)');
 
-    // Cleanup resources before restart
+    // Cleanup resources
     try {
       backendClient?.dispose();
     } catch (_) {
       // Ignore cleanup errors
     }
 
-    print('Restarting in 5 seconds...');
-    await Future.delayed(const Duration(seconds: 5));
-    return _run();
+    // Exit with error code instead of restarting
+    // Let Docker/Coolify handle restarts with restart policy
+    print('[BOT] Exiting with error code...');
+    exit(1);
   }
 }