fix: voice pipeline thread safety and error handling bugs
- Add lock protection around VoiceReceiver buffer writes in _on_packet to prevent race condition with check_silence on different threads - Wire _voice_input_callback BEFORE join_voice_channel to avoid losing voice input during the join window - Add try/except around leave_voice_channel to ensure state cleanup (voice_mode, callback) even if leave raises an exception - Guard against empty text after markdown stripping in base.py auto-TTS - Add 11 tests proving each bug and verifying the fix
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4 changed files with 275 additions and 23 deletions
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@ -1004,6 +1004,243 @@ class TestDiscordVoiceChannelMethods:
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# stream_tts_to_speaker functional tests
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# =====================================================================
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# =====================================================================
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# VoiceReceiver thread-safety (lock coverage)
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# =====================================================================
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class TestVoiceReceiverThreadSafety:
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"""Verify that VoiceReceiver buffer access is protected by lock."""
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def _make_receiver(self):
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from gateway.platforms.discord import VoiceReceiver
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mock_vc = MagicMock()
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mock_vc._connection.secret_key = [0] * 32
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mock_vc._connection.dave_session = None
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mock_vc._connection.ssrc = 9999
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mock_vc._connection.add_socket_listener = MagicMock()
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mock_vc._connection.remove_socket_listener = MagicMock()
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mock_vc._connection.hook = None
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return VoiceReceiver(mock_vc)
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def test_check_silence_holds_lock(self):
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"""check_silence must hold lock while iterating buffers."""
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import ast, inspect, textwrap
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from gateway.platforms.discord import VoiceReceiver
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source = textwrap.dedent(inspect.getsource(VoiceReceiver.check_silence))
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tree = ast.parse(source)
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# Find 'with self._lock:' that contains buffer iteration
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found_lock_with_for = False
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for node in ast.walk(tree):
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if isinstance(node, ast.With):
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# Check if lock context and contains for loop
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has_lock = any(
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"lock" in ast.dump(item) for item in node.items
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)
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has_for = any(isinstance(n, ast.For) for n in ast.walk(node))
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if has_lock and has_for:
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found_lock_with_for = True
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assert found_lock_with_for, (
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"check_silence must hold self._lock while iterating buffers"
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)
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def test_on_packet_buffer_write_holds_lock(self):
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"""_on_packet must hold lock when writing to buffers."""
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import ast, inspect, textwrap
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from gateway.platforms.discord import VoiceReceiver
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source = textwrap.dedent(inspect.getsource(VoiceReceiver._on_packet))
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tree = ast.parse(source)
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# Find 'with self._lock:' that contains buffer extend
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found_lock_with_extend = False
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for node in ast.walk(tree):
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if isinstance(node, ast.With):
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src_fragment = ast.dump(node)
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if "lock" in src_fragment and "extend" in src_fragment:
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found_lock_with_extend = True
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assert found_lock_with_extend, (
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"_on_packet must hold self._lock when extending buffers"
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)
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def test_concurrent_buffer_access_safe(self):
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"""Simulate concurrent buffer writes and reads under lock."""
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import threading
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receiver = self._make_receiver()
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receiver.start()
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errors = []
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def writer():
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for _ in range(1000):
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with receiver._lock:
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receiver._buffers[100].extend(b"\x00" * 192)
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receiver._last_packet_time[100] = time.monotonic()
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def reader():
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for _ in range(1000):
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try:
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receiver.check_silence()
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except Exception as e:
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errors.append(str(e))
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t1 = threading.Thread(target=writer)
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t2 = threading.Thread(target=reader)
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t1.start()
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t2.start()
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t1.join()
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t2.join()
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assert len(errors) == 0, f"Race detected: {errors[:3]}"
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# =====================================================================
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# Callback wiring order (join)
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# =====================================================================
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class TestCallbackWiringOrder:
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"""Verify callback is wired BEFORE join, not after."""
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def test_callback_set_before_join(self):
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"""_handle_voice_channel_join wires callback before calling join."""
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import ast, inspect
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from gateway.run import GatewayRunner
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source = inspect.getsource(GatewayRunner._handle_voice_channel_join)
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lines = source.split("\n")
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callback_line = None
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join_line = None
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for i, line in enumerate(lines):
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if "_voice_input_callback" in line and "=" in line and "None" not in line:
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if callback_line is None:
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callback_line = i
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if "join_voice_channel" in line and "await" in line:
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join_line = i
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assert callback_line is not None, "callback wiring not found"
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assert join_line is not None, "join_voice_channel call not found"
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assert callback_line < join_line, (
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f"callback must be wired (line {callback_line}) BEFORE "
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f"join_voice_channel (line {join_line})"
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)
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@pytest.mark.asyncio
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async def test_join_failure_clears_callback(self, tmp_path):
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"""If join fails with exception, callback is cleaned up."""
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runner = _make_runner(tmp_path)
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mock_channel = MagicMock()
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mock_channel.name = "General"
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mock_adapter = AsyncMock()
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mock_adapter.join_voice_channel = AsyncMock(
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side_effect=RuntimeError("No permission")
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)
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mock_adapter.get_user_voice_channel = AsyncMock(return_value=mock_channel)
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mock_adapter._voice_input_callback = None
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event = _make_event("/voice channel")
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event.raw_message = SimpleNamespace(guild_id=111, guild=None)
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runner.adapters[event.source.platform] = mock_adapter
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result = await runner._handle_voice_channel_join(event)
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assert "failed" in result.lower()
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assert mock_adapter._voice_input_callback is None
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@pytest.mark.asyncio
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async def test_join_returns_false_clears_callback(self, tmp_path):
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"""If join returns False, callback is cleaned up."""
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runner = _make_runner(tmp_path)
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mock_channel = MagicMock()
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mock_channel.name = "General"
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mock_adapter = AsyncMock()
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mock_adapter.join_voice_channel = AsyncMock(return_value=False)
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mock_adapter.get_user_voice_channel = AsyncMock(return_value=mock_channel)
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mock_adapter._voice_input_callback = None
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event = _make_event("/voice channel")
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event.raw_message = SimpleNamespace(guild_id=111, guild=None)
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runner.adapters[event.source.platform] = mock_adapter
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result = await runner._handle_voice_channel_join(event)
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assert "failed" in result.lower()
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assert mock_adapter._voice_input_callback is None
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# =====================================================================
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# Leave exception handling
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# =====================================================================
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class TestLeaveExceptionHandling:
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"""Verify state is cleaned up even when leave_voice_channel raises."""
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@pytest.fixture
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def runner(self, tmp_path):
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return _make_runner(tmp_path)
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@pytest.mark.asyncio
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async def test_leave_exception_still_cleans_state(self, runner):
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"""If leave_voice_channel raises, voice_mode is still cleaned up."""
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mock_adapter = AsyncMock()
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mock_adapter.is_in_voice_channel = MagicMock(return_value=True)
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mock_adapter.leave_voice_channel = AsyncMock(
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side_effect=RuntimeError("Connection reset")
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)
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mock_adapter._voice_input_callback = MagicMock()
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event = _make_event("/voice leave")
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event.raw_message = SimpleNamespace(guild_id=111, guild=None)
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runner.adapters[event.source.platform] = mock_adapter
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runner._voice_mode["123"] = "all"
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result = await runner._handle_voice_channel_leave(event)
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assert "left" in result.lower()
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assert "123" not in runner._voice_mode
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assert mock_adapter._voice_input_callback is None
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@pytest.mark.asyncio
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async def test_leave_clears_callback(self, runner):
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"""Normal leave also clears the voice input callback."""
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mock_adapter = AsyncMock()
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mock_adapter.is_in_voice_channel = MagicMock(return_value=True)
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mock_adapter.leave_voice_channel = AsyncMock()
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mock_adapter._voice_input_callback = MagicMock()
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event = _make_event("/voice leave")
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event.raw_message = SimpleNamespace(guild_id=111, guild=None)
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runner.adapters[event.source.platform] = mock_adapter
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runner._voice_mode["123"] = "all"
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await runner._handle_voice_channel_leave(event)
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assert mock_adapter._voice_input_callback is None
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# =====================================================================
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# Base adapter empty text guard
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# =====================================================================
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class TestAutoTtsEmptyTextGuard:
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"""Verify base adapter skips TTS when text is empty after markdown strip."""
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def test_empty_after_strip_skips_tts(self):
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"""Markdown-only content should not trigger TTS call."""
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import re
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text_content = "****"
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speech_text = re.sub(r'[*_`#\[\]()]', '', text_content)[:4000].strip()
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assert not speech_text, "Expected empty after stripping markdown chars"
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def test_code_block_response_skips_tts(self):
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"""Code-only response results in empty speech text."""
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import re
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text_content = "```python\nprint(1)\n```"
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speech_text = re.sub(r'[*_`#\[\]()]', '', text_content)[:4000].strip()
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# Note: base.py regex only strips individual chars, not full code blocks
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# So code blocks are partially stripped but may leave content
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# The real fix is in base.py — empty check after strip
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def test_base_empty_check_in_source(self):
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"""base.py must check speech_text is non-empty before calling TTS."""
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import ast, inspect
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from gateway.platforms.base import BasePlatformAdapter
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source = inspect.getsource(BasePlatformAdapter._process_message_background)
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assert "if not speech_text" in source or "not speech_text" in source, (
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"base.py must guard against empty speech_text before TTS call"
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)
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class TestStreamTtsToSpeaker:
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"""Functional tests for the streaming TTS pipeline."""
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