Fix Qt worker lifecycle crash

javis-gui-crash.log

@@ -0,0 +1,13 @@
+Fatal Python error: Aborted
+
+Current thread 0x000066dc (most recent call first):
+  File "D:\Javis-Projekt\src\javis\ui\main_window.py", line 301 in _generation_complete
+  File "D:\Javis-Projekt\src\javis\ui\app.py", line 44 in run_gui
+  File "D:\Javis-Projekt\src\javis\interface\cli.py", line 429 in main
+  File "D:\Javis-Projekt\.venv\Scripts\javis.exe\__main__.py", line 10 in <module>
+  File "<frozen runpy>", line 88 in _run_code
+  File "<frozen runpy>", line 198 in _run_module_as_main
+
+Extension modules: charset_normalizer.md, charset_normalizer.cd, requests.packages.charset_normalizer.md, requests.packages.chardet.md, requests.packages.charset_normalizer.cd, requests.packages.chardet.cd, _cffi_backend, websockets.speedups, shiboken6.Shiboken, PySide6.QtCore, PySide6.QtGui, PySide6.QtWidgets (total: 12)
+QThreadStorage: entry 1 destroyed before end of thread 0x28a793bea70
+QThreadStorage: entry 0 destroyed before end of thread 0x28a793bea70

src/javis/core/provider_router.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import threading
 from collections.abc import Callable, Iterator
 from dataclasses import dataclass
 from enum import StrEnum
@@ -84,6 +85,8 @@ class HybridProvider:
         self._max_cloud_input_chars = max_cloud_input_chars
         self._max_cloud_context_messages = max_cloud_context_messages
         self._cloud_session_disabled = False
+        self._approval_lock = threading.Lock()
+        self._next_approval: ApprovalChoice | None = None
         self.last_route: RouteStatus | None = None
 
     def supports_session(self, provider: str, model: str) -> bool:
@@ -97,7 +100,26 @@ class HybridProvider:
             raise ValueError("Provider-Modus muss auto, local oder gemini sein.")
         self.mode = mode
 
+    def privacy_decision(self, text: str) -> PrivacyDecision:
+        """Classify a prospective request without contacting a provider."""
+        return self._privacy_router.classify(
+            text,
+            cloud_requested=self.mode == "gemini",
+        )
+
+    def queue_approval(self, choice: ApprovalChoice) -> None:
+        """Provide the GUI decision for exactly the next ASK request."""
+        if choice not in {ApprovalChoice.ALLOW, ApprovalChoice.LOCAL}:
+            raise ValueError("Nur Freigabe oder lokale Antwort kann vorgemerkt werden.")
+        with self._approval_lock:
+            self._next_approval = choice
+
     def _approval_choice(self, decision: PrivacyDecision) -> ApprovalChoice:
+        with self._approval_lock:
+            queued = self._next_approval
+            self._next_approval = None
+        if queued is not None:
+            return queued
         result = self._approval_callback(decision)
         if isinstance(result, bool):
             return ApprovalChoice.ALLOW if result else ApprovalChoice.LOCAL

src/javis/ui/app.py

@@ -10,6 +10,7 @@ from PySide6.QtCore import QTimer
 from PySide6.QtWidgets import QApplication, QMessageBox
 
 from javis.config.settings import ConfigurationError, Settings
+from javis.core.provider_router import ApprovalChoice
 from javis.core.runtime import build_javis_runtime
 from javis.memory.sqlite_store import SessionStoreError
 from javis.memory.usage_store import UsageStoreError
@@ -26,7 +27,7 @@ def run_gui(argv: Sequence[str] | None = None) -> int:
         settings = Settings.from_env()
         runtime = build_javis_runtime(
             settings,
-            approval_callback=approval_bridge.request,
+            approval_callback=lambda _decision: ApprovalChoice.CANCEL,
             notice_callback=approval_bridge.notice_received.emit,
         )
     except (ConfigurationError, SessionStoreError, UsageStoreError) as exc:

src/javis/ui/chat_controller.py

@@ -6,9 +6,11 @@ import re
 import threading
 from collections.abc import Iterator
 
+from javis.core.provider_router import ApprovalChoice
 from javis.core.runtime import JavisRuntime
 from javis.memory.sqlite_store import ChatSession
 from javis.providers.base import ProviderError, ResponseAbortedError
+from javis.security.privacy import CloudPolicy, PrivacyDecision
 from javis.ui.models import (
     DesktopStatus,
     GenerationState,
@@ -65,6 +67,16 @@ class DesktopController:
     def set_mode(self, mode: str) -> None:
         self.runtime.hybrid_provider.set_mode(mode)
 
+    def approval_decision(self, text: str) -> PrivacyDecision | None:
+        provider = self.runtime.hybrid_provider
+        decision = provider.privacy_decision(text)
+        if provider.mode == "local" or decision.policy is not CloudPolicy.ASK:
+            return None
+        return decision
+
+    def queue_approval(self, choice: ApprovalChoice) -> None:
+        self.runtime.hybrid_provider.queue_approval(choice)
+
     def stream_message(
         self,
         text: str,

src/javis/ui/main_window.py

@@ -57,6 +57,8 @@ class MainWindow(QMainWindow):
         self.approval_bridge = approval_bridge
         self._thread: QThread | None = None
         self._worker: StreamWorker | None = None
+        self._generation_finalized = True
+        self._close_when_finished = False
         self._messages: list[ChatMessage] = []
         self._draft_user = ""
         self._draft_assistant = ""
@@ -158,7 +160,6 @@ class MainWindow(QMainWindow):
         self.stop_button.clicked.connect(self._stop_generation)
         self.message_edit.send_requested.connect(self._send)
         self.mode_combo.currentIndexChanged.connect(self._mode_changed)
-        self.approval_bridge.approval_requested.connect(self._show_approval)
         self.approval_bridge.notice_received.connect(self._show_notice)
 
     def _apply_style(self) -> None:
@@ -266,25 +267,40 @@ class MainWindow(QMainWindow):
         text = self.message_edit.toPlainText().strip()
         if not text or self._worker is not None:
             return
+        try:
+            decision = self.controller.approval_decision(text)
+            if decision is not None:
+                choice = self._show_approval(decision)
+                if choice is ApprovalChoice.CANCEL:
+                    self.statusBar().showMessage("Anfrage abgebrochen.", 3000)
+                    return
+                self.controller.queue_approval(choice)
+        except Exception as exc:
+            self._show_error(str(exc))
+            return
         self.message_edit.clear()
         self._draft_user = text
         self._draft_assistant = ""
         self._render_chat()
         self._set_generating(True)
+        self._generation_finalized = False
         thread = QThread(self)
         worker = StreamWorker(self.controller, text)
         worker.moveToThread(thread)
         thread.started.connect(worker.run)
         worker.event_received.connect(self._handle_stream_event)
         worker.completed.connect(thread.quit)
+        worker.completed.connect(worker.deleteLater)
         worker.completed.connect(self._generation_complete)
-        thread.finished.connect(worker.deleteLater)
+        thread.finished.connect(self._thread_finished)
         thread.finished.connect(thread.deleteLater)
         self._thread = thread
         self._worker = worker
         thread.start()
 
     def _handle_stream_event(self, event: StreamEvent) -> None:
+        if self._generation_finalized:
+            return
         if event.kind is StreamEventKind.CHUNK:
             self._draft_assistant += event.text
             self._render_chat()
@@ -294,12 +310,13 @@ class MainWindow(QMainWindow):
             self._show_error(event.text)
 
     def _generation_complete(self) -> None:
+        if self._generation_finalized:
+            return
+        self._generation_finalized = True
         failed = self.controller.state in {
             GenerationState.ABORTED,
             GenerationState.ERROR,
         }
-        self._worker = None
-        self._thread = None
         self._set_generating(False)
         try:
             loaded = self.controller.load_session(self.controller.active_session_id or "")
@@ -315,11 +332,17 @@ class MainWindow(QMainWindow):
         else:
             self.statusBar().showMessage("Antwort vollständig gespeichert.", 3000)
 
+    def _thread_finished(self) -> None:
+        self._worker = None
+        self._thread = None
+        if self._close_when_finished:
+            self._close_when_finished = False
+            QTimer.singleShot(0, self.close)
+
     def _stop_generation(self) -> None:
         if self._worker is None:
             return
         self._worker.request_cancel()
-        self.approval_bridge.cancel_pending()
         self.statusBar().showMessage("Abbruch angefordert …")
 
     def _set_generating(self, active: bool) -> None:
@@ -336,7 +359,7 @@ class MainWindow(QMainWindow):
         except Exception as exc:
             self._show_error(str(exc))
 
-    def _show_approval(self, decision: PrivacyDecision) -> None:
+    def _show_approval(self, decision: PrivacyDecision) -> ApprovalChoice:
         box = QMessageBox(self)
         box.setWindowTitle("Cloudfreigabe")
         box.setIcon(QMessageBox.Question)
@@ -357,9 +380,9 @@ class MainWindow(QMainWindow):
             choice = ApprovalChoice.LOCAL
         elif clicked is cancel:
             choice = ApprovalChoice.CANCEL
-        self.approval_bridge.resolve(choice)
         if box.clickedButton() is local:
             self.statusBar().showMessage("Die Anfrage wird lokal beantwortet.", 3000)
+        return choice
 
     def _show_notice(self, text: str) -> None:
         self.statusBar().showMessage(text, 5000)
@@ -438,8 +461,9 @@ class MainWindow(QMainWindow):
         self.search_edit.selectAll()
 
     def closeEvent(self, event: QCloseEvent) -> None:
+        if self._thread is not None:
+            self._close_when_finished = True
             self._stop_generation()
-        if self._thread is not None and not self._thread.wait(2500):
             event.ignore()
             self.statusBar().showMessage(
                 "Javis beendet die laufende Antwort noch kontrolliert.",

src/javis/ui/workers.py

@@ -53,9 +53,14 @@ class StreamWorker(QObject):
         self._controller = controller
         self._text = text
         self._cancel_event = threading.Event()
+        self._started = False
+        self._completed = False
 
     @Slot()
     def run(self) -> None:
+        if self._started:
+            return
+        self._started = True
         try:
             for event in self._controller.stream_message(
                 self._text,
@@ -63,6 +68,8 @@ class StreamWorker(QObject):
             ):
                 self.event_received.emit(event)
         finally:
+            if not self._completed:
+                self._completed = True
                 self.completed.emit()
 
     def request_cancel(self) -> None:

tests/unit/test_desktop_controller.py

@@ -7,8 +7,10 @@ from pathlib import Path
 from types import SimpleNamespace
 
 from javis.core.chat_service import ChatService
+from javis.core.provider_router import ApprovalChoice
 from javis.memory.sqlite_store import SQLiteSessionStore
 from javis.providers.base import ChatMessage, ResponseAbortedError
+from javis.security.privacy import CloudPolicy, PrivacyDecision
 from javis.ui.chat_controller import DesktopController, sanitized_error
 from javis.ui.models import GenerationState, StreamEventKind
 
@@ -45,10 +47,17 @@ class _Service:
 class _Hybrid:
     mode = "auto"
     last_route = None
+    queued_approval = None
 
     def set_mode(self, mode: str) -> None:
         self.mode = mode
 
+    def privacy_decision(self, _text: str) -> PrivacyDecision:
+        return PrivacyDecision(CloudPolicy.ASK, "Test")
+
+    def queue_approval(self, choice: ApprovalChoice) -> None:
+        self.queued_approval = choice
+
 
 class _StreamingProvider:
     name = "ollama"
@@ -91,6 +100,17 @@ class DesktopControllerTests(unittest.TestCase):
         self.assertEqual(loaded.messages[0].content, "Hallo")
         self.assertEqual(renamed.title, "Neu")
 
+    def test_controller_preflights_and_queues_gui_approval(self) -> None:
+        decision = self.controller.approval_decision("Private Frage")
+        self.controller.queue_approval(ApprovalChoice.ALLOW)
+
+        self.assertIsNotNone(decision)
+        self.assertIs(decision.policy, CloudPolicy.ASK)
+        self.assertIs(
+            self.runtime.hybrid_provider.queued_approval,
+            ApprovalChoice.ALLOW,
+        )
+
     def test_error_sanitizer_masks_key_patterns(self) -> None:
         secret = "AIza" + "x" * 25
         result = sanitized_error(RuntimeError(f"Fehler {secret}"))

tests/unit/test_desktop_gui.py

@@ -1,6 +1,8 @@
 from __future__ import annotations
 
 import os
+import threading
+import time
 import unittest
 from types import SimpleNamespace
 from unittest.mock import Mock, patch
@@ -13,8 +15,8 @@ from javis.core.provider_router import ApprovalChoice
 from javis.providers.base import ChatMessage
 from javis.security.privacy import CloudPolicy, PrivacyDecision
 from javis.ui.main_window import MainWindow
-from javis.ui.models import DesktopStatus, GenerationState
-from javis.ui.workers import ApprovalBridge
+from javis.ui.models import DesktopStatus, GenerationState, StreamEvent, StreamEventKind
+from javis.ui.workers import ApprovalBridge, StreamWorker
 
 
 class _Controller:
@@ -28,6 +30,15 @@ class _Controller:
             message_count=2,
             updated_at="2026-07-30T20:00:00+00:00",
         )
+        self.messages = [
+            ChatMessage("user", "Hallo"),
+            ChatMessage("assistant", "Guten Tag"),
+        ]
+        self.approval: PrivacyDecision | None = None
+        self.queued_approval: ApprovalChoice | None = None
+        self.started = threading.Event()
+        self.release = threading.Event()
+        self.release.set()
 
     def list_sessions(self, search: str = ""):
         return [self.session] if not search or search in self.session.title else []
@@ -36,10 +47,7 @@ class _Controller:
         self.active_session_id = session_id
         return SimpleNamespace(
             session=self.session,
-            messages=[
-                ChatMessage("user", "Hallo"),
-                ChatMessage("assistant", "Guten Tag"),
-            ],
+            messages=list(self.messages),
         )
 
     def new_session(self):
@@ -53,6 +61,38 @@ class _Controller:
     def set_mode(self, _mode: str) -> None:
         return
 
+    def approval_decision(self, _text: str) -> PrivacyDecision | None:
+        return self.approval
+
+    def queue_approval(self, choice: ApprovalChoice) -> None:
+        self.queued_approval = choice
+
+    def stream_message(self, text: str, cancel_event: threading.Event):
+        self.started.set()
+        self.state = GenerationState.THINKING
+        yield StreamEvent(StreamEventKind.STATE, state=self.state)
+        while not self.release.wait(0.005):
+            if cancel_event.is_set():
+                self.state = GenerationState.ABORTED
+                yield StreamEvent(StreamEventKind.STATE, state=self.state)
+                return
+        if cancel_event.is_set():
+            self.state = GenerationState.ABORTED
+            yield StreamEvent(StreamEventKind.STATE, state=self.state)
+            return
+        self.state = GenerationState.ANSWERING
+        yield StreamEvent(StreamEventKind.STATE, state=self.state)
+        yield StreamEvent(StreamEventKind.CHUNK, text="Testantwort")
+        self.messages.extend(
+            [
+                ChatMessage("user", text),
+                ChatMessage("assistant", "Testantwort"),
+            ]
+        )
+        self.session.message_count = len(self.messages)
+        self.state = GenerationState.READY
+        yield StreamEvent(StreamEventKind.FINISHED, state=self.state)
+
     def status(self) -> DesktopStatus:
         return DesktopStatus(
             state=self.state,
@@ -108,14 +148,26 @@ class DesktopGuiTests(unittest.TestCase):
 
     def setUp(self) -> None:
         self.bridge = ApprovalBridge()
-        self.window = MainWindow(_Controller(), self.bridge)
+        self.controller = _Controller()
+        self.window = MainWindow(self.controller, self.bridge)
         self.window.show()
         self.application.processEvents()
 
     def tearDown(self) -> None:
+        self.controller.release.set()
+        self.window._stop_generation()
+        self._process_until(lambda: self.window._thread is None)
         self.window.close()
         self.application.processEvents()
 
+    def _process_until(self, condition, timeout: float = 2.0) -> None:
+        deadline = time.monotonic() + timeout
+        while not condition() and time.monotonic() < deadline:
+            self.application.processEvents()
+            time.sleep(0.005)
+        self.application.processEvents()
+        self.assertTrue(condition())
+
     def test_offscreen_window_loads_session_and_core_widgets(self) -> None:
         self.assertEqual(self.window.windowTitle(), "Javis Desktop")
         self.assertEqual(self.window.session_list.count(), 1)
@@ -137,5 +189,94 @@ class DesktopGuiTests(unittest.TestCase):
             for label, choice in expected.items():
                 with self.subTest(label=label):
                     _MessageBox.selected_label = label
-                    self.window._show_approval(decision)
-                    self.bridge.resolve.assert_called_with(choice)
+                    self.assertIs(self.window._show_approval(decision), choice)
+
+    def test_local_completion_and_second_question_keep_gui_reusable(self) -> None:
+        for text in ("Erste Frage", "Zweite Frage"):
+            self.window.message_edit.setPlainText(text)
+            self.window._send()
+            self._process_until(lambda: self.window._thread is None)
+
+        self.assertEqual(self.controller.session.message_count, 6)
+        self.assertIn("Zweite Frage", self.window.chat_view.toPlainText())
+        self.assertTrue(self.window.send_button.isEnabled())
+
+    def test_approval_is_decided_before_worker_starts(self) -> None:
+        self.controller.approval = PrivacyDecision(CloudPolicy.ASK, "privat")
+        self.window._show_approval = Mock(return_value=ApprovalChoice.ALLOW)
+
+        self.window.message_edit.setPlainText("Private Testfrage")
+        self.window._send()
+
+        self.assertIs(self.controller.queued_approval, ApprovalChoice.ALLOW)
+        self.window._show_approval.assert_called_once()
+        self._process_until(lambda: self.window._thread is None)
+
+    def test_local_approval_choice_is_queued_before_worker_starts(self) -> None:
+        self.controller.approval = PrivacyDecision(CloudPolicy.ASK, "privat")
+        self.window._show_approval = Mock(return_value=ApprovalChoice.LOCAL)
+
+        self.window.message_edit.setPlainText("Lokal beantworten")
+        self.window._send()
+
+        self.assertIs(self.controller.queued_approval, ApprovalChoice.LOCAL)
+        self._process_until(lambda: self.window._thread is None)
+
+    def test_stop_during_streaming_discards_partial_exchange(self) -> None:
+        self.controller.release.clear()
+        before = list(self.controller.messages)
+        self.window.message_edit.setPlainText("Nicht speichern")
+        self.window._send()
+        self._process_until(self.controller.started.is_set)
+
+        self.window._stop_generation()
+        self._process_until(lambda: self.window._thread is None)
+
+        self.assertEqual(self.controller.messages, before)
+        self.assertEqual(self.controller.state, GenerationState.ABORTED)
+
+    def test_stop_immediately_after_start_is_safe(self) -> None:
+        self.controller.release.clear()
+        self.window.message_edit.setPlainText("Sofort stoppen")
+        self.window._send()
+        self.window._stop_generation()
+
+        self._process_until(lambda: self.window._thread is None)
+        self.assertEqual(self.controller.session.message_count, 2)
+
+    def test_completion_is_idempotent_and_retains_qt_references(self) -> None:
+        worker = object()
+        thread = object()
+        self.window._worker = worker
+        self.window._thread = thread
+        self.window._generation_finalized = False
+
+        self.window._generation_complete()
+        self.window._generation_complete()
+
+        self.assertIs(self.window._worker, worker)
+        self.assertIs(self.window._thread, thread)
+        self.window._thread_finished()
+        self.assertIsNone(self.window._worker)
+        self.assertIsNone(self.window._thread)
+
+    def test_worker_emits_completion_only_once(self) -> None:
+        worker = StreamWorker(self.controller, "Nur einmal")
+        completions: list[bool] = []
+        worker.completed.connect(lambda: completions.append(True))
+
+        worker.run()
+        worker.run()
+
+        self.assertEqual(completions, [True])
+
+    def test_close_during_generation_cancels_then_closes(self) -> None:
+        self.controller.release.clear()
+        self.window.message_edit.setPlainText("Beim Schließen stoppen")
+        self.window._send()
+        self._process_until(self.controller.started.is_set)
+
+        self.window.close()
+        self.assertTrue(self.window._close_when_finished)
+        self._process_until(lambda: self.window._thread is None)
+        self._process_until(lambda: not self.window.isVisible())

tests/unit/test_provider_router.py

@@ -182,6 +182,18 @@ class HybridProviderTests(unittest.TestCase):
         self.assertEqual(answer, "Cloud")
         self.assertEqual(len(self.cloud.calls), 1)
 
+    def test_queued_gui_approval_is_one_shot_and_uses_fake_cloud(self) -> None:
+        router = self._router()
+        question = [ChatMessage("user", "Meine Familie plant Urlaub")]
+        router.queue_approval(ApprovalChoice.ALLOW)
+
+        chunks = list(router.stream_chat(question))
+        second_answer = router.chat(question)
+
+        self.assertEqual(chunks, ["Cloud"])
+        self.assertEqual(second_answer, "Lokal")
+        self.assertEqual(len(self.approvals), 1)
+
     def test_ask_supports_allow_local_and_cancel_choices(self) -> None:
         question = [ChatMessage("user", "Meine Familie plant Urlaub")]