fix(core,xep): Fix multiple issues

- Fix a deadlock in the RandomBackoffReconnectionPolicy on failure
- Fix enablement of stream management happening too early

packages/moxxmpp/lib/src/connection.dart

@@ -10,6 +10,7 @@ import 'package:moxxmpp/src/errors.dart';
 import 'package:moxxmpp/src/events.dart';
 import 'package:moxxmpp/src/handlers/base.dart';
 import 'package:moxxmpp/src/iq.dart';
+import 'package:moxxmpp/src/jid.dart';
 import 'package:moxxmpp/src/managers/attributes.dart';
 import 'package:moxxmpp/src/managers/base.dart';
 import 'package:moxxmpp/src/managers/data.dart';
@@ -140,6 +141,8 @@ class XmppConnection {
   RoutingState _routingState = RoutingState.preConnection;
 
   /// The currently bound resource or '' if none has been bound yet.
+  /// NOTE: A Using the empty string is okay since RFC7622 says that
+  ///       the resource MUST NOT be zero octets.
   String _resource = '';
   String get resource => _resource;
 
@@ -170,6 +173,13 @@ class XmppConnection {
 
   bool get isAuthenticated => _isAuthenticated;
 
+  /// Returns the JID we authenticate with and add the resource that we have bound.
+  JID _getJidWithResource() {
+    assert(_resource.isNotEmpty, 'The resource must not be empty');
+
+    return connectionSettings.jid.withResource(_resource);
+  }
+
   /// Registers a list of [XmppManagerBase] sub-classes as managers on this connection.
   Future<void> registerManagers(List<XmppManagerBase> managers) async {
     for (final manager in managers) {
@@ -181,7 +191,7 @@ class XmppConnection {
           sendEvent: _sendEvent,
           getConnectionSettings: () => connectionSettings,
           getManagerById: getManagerById,
-          getFullJID: () => connectionSettings.jid.withResource(_resource),
+          getFullJID: _getJidWithResource,
           getSocket: () => _socket,
           getConnection: () => this,
           getNegotiatorById: _negotiationsHandler.getNegotiatorById,
@@ -232,7 +242,7 @@ class XmppConnection {
           _sendEvent,
           _negotiationsHandler.getNegotiatorById,
           getManagerById,
-          () => connectionSettings.jid.withResource(_resource),
+          _getJidWithResource,
           () => _socket,
           () => _isAuthenticated,
           _setAuthenticated,
@@ -295,8 +305,11 @@ class XmppConnection {
     // Connect again
     // ignore: cascade_invocations
     _log.finest('Calling _connectImpl() from _attemptReconnection');
-    await _connectImpl(
+    unawaited(
+      _connectImpl(
         waitForConnection: true,
+        shouldReconnect: false,
+      ),
     );
   }
 
@@ -431,7 +444,7 @@ class XmppConnection {
         case StanzaFromType.full:
           {
             stanza_ = stanza_.copyWith(
-              from: connectionSettings.jid.withResource(_resource).toString(),
+              from: _getJidWithResource().toString(),
             );
           }
           break;
@@ -840,7 +853,6 @@ class XmppConnection {
   /// The private implementation for [XmppConnection.connect]. The parameters have
   /// the same meaning as with [XmppConnection.connect].
   Future<Result<bool, XmppError>> _connectImpl({
-    String? lastResource,
     bool waitForConnection = false,
     bool shouldReconnect = true,
     bool waitUntilLogin = false,
@@ -863,11 +875,9 @@ class XmppConnection {
       _connectionCompleter = Completer();
     }
 
-    if (lastResource != null) {
-      setResource(lastResource, triggerEvent: false);
-    } else {
+    // Reset the resource. If we use stream resumption from XEP-0198, then the
+    // manager will set it on successful resumption.
     setResource('', triggerEvent: false);
-    }
 
     // If requested, wait until we have a network connection
     if (waitForConnection) {
@@ -914,9 +924,6 @@ class XmppConnection {
 
   /// Start the connection process using the provided connection settings.
   ///
-  /// If [lastResource] is set, then its value is used as the connection's resource.
-  /// Useful for stream resumption.
-  ///
   /// [shouldReconnect] indicates whether the reconnection attempts should be
   /// automatically performed after a fatal failure of any kind occurs.
   ///
@@ -931,14 +938,12 @@ class XmppConnection {
   /// [enableReconnectOnSuccess] indicates that automatic reconnection is to be
   /// enabled once the connection has been successfully established.
   Future<Result<bool, XmppError>> connect({
-    String? lastResource,
     bool? shouldReconnect,
     bool waitForConnection = false,
     bool waitUntilLogin = false,
     bool enableReconnectOnSuccess = true,
   }) async {
     final result = _connectImpl(
-      lastResource: lastResource,
       shouldReconnect: shouldReconnect ?? !waitUntilLogin,
       waitForConnection: waitForConnection,
       waitUntilLogin: waitUntilLogin,

packages/moxxmpp/lib/src/reconnect.dart

@@ -111,31 +111,47 @@ class RandomBackoffReconnectionPolicy extends ReconnectionPolicy {
   /// Called when the backoff expired
   @visibleForTesting
   Future<void> onTimerElapsed() async {
-    _log.fine('Timer elapsed. Waiting for lock...');
-    await _timerLock.synchronized(() async {
+    _log.finest('Timer elapsed. Waiting for lock...');
+    final shouldContinue = await _timerLock.synchronized(() async {
+      _log.finest('Timer lock aquired');
+      if (_timer == null) {
+        _log.finest(
+          'The timer is already set to null. Doing nothing.',
+        );
+        return false;
+      }
+
       if (!(await getIsReconnecting())) {
-        return;
+        return false;
       }
 
       if (!(await getShouldReconnect())) {
-        _log.fine(
+        _log.finest(
           'Should not reconnect. Stopping here.',
         );
+        return false;
+      }
+
+      _timer?.cancel();
+      _timer = null;
+      return true;
+    });
+
+    if (!shouldContinue) {
       return;
     }
 
     _log.fine('Triggering reconnect');
-      _timer?.cancel();
-      _timer = null;
     await performReconnect!();
-    });
   }
 
   @override
   Future<void> reset() async {
     _log.finest('Resetting internal state');
+    await _timerLock.synchronized(() {
       _timer?.cancel();
       _timer = null;
+    });
     await super.reset();
   }
 
@@ -144,9 +160,11 @@ class RandomBackoffReconnectionPolicy extends ReconnectionPolicy {
     final seconds =
         Random().nextInt(_maxBackoffTime - _minBackoffTime) + _minBackoffTime;
     _log.finest('Failure occured. Starting random backoff with ${seconds}s');
-    _timer?.cancel();
 
+    await _timerLock.synchronized(() {
+      _timer?.cancel();
       _timer = Timer(Duration(seconds: seconds), onTimerElapsed);
+    });
   }
 
   @override

packages/moxxmpp/lib/src/xeps/xep_0198/negotiator.dart

@@ -1,6 +1,5 @@
 import 'package:collection/collection.dart';
 import 'package:logging/logging.dart';
-import 'package:meta/meta.dart';
 import 'package:moxxmpp/src/events.dart';
 import 'package:moxxmpp/src/managers/namespaces.dart';
 import 'package:moxxmpp/src/namespaces.dart';
@@ -60,11 +59,7 @@ class StreamManagementNegotiator extends Sasl2FeatureNegotiator
   bool _inlineStreamEnablementRequested = false;
 
   /// Cached resource for stream resumption
-  String _resource = '';
-  @visibleForTesting
-  void setResource(String resource) {
-    _resource = resource;
-  }
+  String resource = '';
 
   @override
   bool canInlineFeature(List<XMLNode> features) {
@@ -90,7 +85,7 @@ class StreamManagementNegotiator extends Sasl2FeatureNegotiator
   @override
   Future<void> onXmppEvent(XmppEvent event) async {
     if (event is ResourceBoundEvent) {
-      _resource = event.resource;
+      resource = event.resource;
     }
   }
 
@@ -100,7 +95,9 @@ class StreamManagementNegotiator extends Sasl2FeatureNegotiator
 
     if (sm.state.streamResumptionId != null && !_resumeFailed) {
       // We could do Stream resumption
-      return super.matchesFeature(features) && attributes.isAuthenticated();
+      return super.matchesFeature(features) &&
+          attributes.isAuthenticated() &&
+          resource.isNotEmpty;
     } else {
       // We cannot do a stream resumption
       return super.matchesFeature(features) &&
@@ -122,23 +119,23 @@ class StreamManagementNegotiator extends Sasl2FeatureNegotiator
     _resumeFailed = true;
     _isResumed = false;
     _state = _StreamManagementNegotiatorState.ready;
+    resource = '';
+    attributes.setResource('', triggerEvent: false);
   }
 
   Future<void> _onStreamResumptionSuccessful(XMLNode resumed) async {
     assert(resumed.tag == 'resumed', 'The correct element must be passed');
+    assert(
+      resource.isNotEmpty,
+      'The Stream Management Negotiator must know of the previous resource',
+    );
 
     final h = int.parse(resumed.attributes['h']! as String);
     await attributes.sendEvent(StreamResumedEvent(h: h));
 
     _resumeFailed = false;
     _isResumed = true;
-
-    if (attributes.getConnection().resource.isEmpty && _resource.isNotEmpty) {
-      attributes.setResource(_resource);
-    } else if (attributes.getConnection().resource.isNotEmpty &&
-        _resource.isEmpty) {
-      _resource = attributes.getConnection().resource;
-    }
+    attributes.setResource(resource);
   }
 
   Future<void> _onStreamEnablementSuccessful(XMLNode enabled) async {
@@ -152,7 +149,7 @@ class StreamManagementNegotiator extends Sasl2FeatureNegotiator
 
     await attributes.sendEvent(
       StreamManagementEnabledEvent(
-        resource: attributes.getFullJID().resource,
+        resource: resource,
         id: id,
         location: enabled.attributes['location'] as String?,
       ),
@@ -197,10 +194,12 @@ class StreamManagementNegotiator extends Sasl2FeatureNegotiator
           _log.finest('Stream Management resumption successful');
 
           assert(
-            attributes.getFullJID().resource != '',
+            resource.isNotEmpty,
             'Resume only works when we already have a resource bound and know about it',
           );
 
+          // TODO(Unknown): Don't do this here. We trigger an event that the CSIManager
+          //                can consume.
           final csi = attributes.getManagerById(csiManager) as CSIManager?;
           if (csi != null) {
             csi.restoreCSIState();

packages/moxxmpp/lib/src/xeps/xep_0384/xep_0384.dart

@@ -42,7 +42,6 @@ const _doNotEncryptList = [
   DoNotEncrypt('stanza-id', stableIdXmlns),
 ];
 
-@mustCallSuper
 abstract class BaseOmemoManager extends XmppManagerBase {
   BaseOmemoManager() : super(omemoManager);
 

packages/moxxmpp/test/reconnection_test.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'package:moxxmpp/moxxmpp.dart';
 import 'package:test/test.dart';
 import 'helpers/logging.dart';
@@ -63,6 +64,8 @@ void main() {
       counter++;
     });
     await policy.setShouldReconnect(true);
+    // ignore: avoid_print
+    print('policy.setShouldReconnect(true) done');
 
     // We have a failure
     expect(
@@ -70,9 +73,13 @@ void main() {
       true,
     );
     await policy.onFailure();
+    // ignore: avoid_print
+    print('policy.onFailure() done');
 
-    await policy.onTimerElapsed();
-    await policy.onTimerElapsed();
+    unawaited(policy.onTimerElapsed());
+    unawaited(policy.onTimerElapsed());
+
+    await Future<void>.delayed(const Duration(seconds: 3));
     expect(counter, 1);
   });
 }

packages/moxxmpp/test/xeps/xep_0198_test.dart

@@ -514,7 +514,7 @@ void main() {
       await conn.registerFeatureNegotiators([
         SaslPlainNegotiator(),
         ResourceBindingNegotiator(),
-        StreamManagementNegotiator(),
+        StreamManagementNegotiator()..resource = 'test-resource',
       ]);
       await conn.getManagerById<StreamManagementManager>(smManager)!.setState(
             StreamManagementState(
@@ -536,6 +536,15 @@ void main() {
             .isStreamManagementEnabled(),
         true,
       );
+      expect(conn.resource, 'MU29eEZn');
+      expect(
+        conn
+            .getNegotiatorById<StreamManagementNegotiator>(
+              streamManagementNegotiator,
+            )!
+            .resource,
+        'MU29eEZn',
+      );
     });
 
     test('Test a successful stream resumption', () async {
@@ -604,7 +613,7 @@ void main() {
       await conn.registerFeatureNegotiators([
         SaslPlainNegotiator(),
         ResourceBindingNegotiator(),
-        StreamManagementNegotiator(),
+        StreamManagementNegotiator()..resource = 'abc123',
       ]);
       await conn.getManagerById<StreamManagementManager>(smManager)!.setState(
             StreamManagementState(
@@ -615,7 +624,6 @@ void main() {
           );
 
       await conn.connect(
-        lastResource: 'abc123',
         waitUntilLogin: true,
       );
       expect(fakeSocket.getState(), 4);
@@ -690,7 +698,7 @@ void main() {
     await conn.registerFeatureNegotiators([
       SaslPlainNegotiator(),
       ResourceBindingNegotiator(),
-      StreamManagementNegotiator()..setResource('test-resource'),
+      StreamManagementNegotiator()..resource = 'test-resource',
       Sasl2Negotiator(
         userAgent: const UserAgent(
           id: 'd4565fa7-4d72-4749-b3d3-740edbf87770',
@@ -787,7 +795,7 @@ void main() {
     await conn.registerFeatureNegotiators([
       SaslPlainNegotiator(),
       ResourceBindingNegotiator(),
-      StreamManagementNegotiator()..setResource('test-resource'),
+      StreamManagementNegotiator()..resource = 'test-resource',
       Bind2Negotiator(),
       Sasl2Negotiator(
         userAgent: const UserAgent(