ducoterra
3a4035fc96
--- **Phase 110 — Fix SSE DB Connection Pool Exhaustion (SEC-14-04): COMPLETE** **What was implemented/verified:** - All three tasks (pool config, short-lived sessions, concurrency cap) were already implemented in code - Fixed `tests/integration/test_chat_db_sessions.py` — added FakeChatLLM mock, fixed LLM signature (`tools=` not `_tools=`), used `fastapi_app.dependency_overrides` instead of `client.app.dependency_overrides` - Fixed `tests/e2e/test_chat_db_pool.py` — added FakeChatLLM mock, fixed admin password to match `tests/conftest.py`, removed unused imports - Fixed lint errors (unused imports, import order) in both test files **Test / lint / coverage results:** - `uv run pytest` → 2350 passed, 1 warning, 56.4s - `uv run pytest --cov=app --cov-report=term-missing` → 99% coverage (4065 lines, 16 uncovered) - `uv run pytest tests/e2e/test_chat_db_pool.py -v --no-cov` → 3 passed - `uv run pytest tests/integration/test_chat_db_sessions.py -v --no-cov` → 4 passed - `uv run pytest tests/integration/test_chat_concurrency.py -v --no-cov` → 11 passed - `uv run pytest tests/unit/test_db_pool_config.py -v --no-cov` → 14 passed - `uv run pytest tests/unit/test_agent_short_lived_sessions.py -v --no-cov` → 7 passed - `uv run ruff check .` → all checks passed - `uv run pyright` → 0 errors, 0 warnings **Completion criteria:** - [✓] `app/db.py::create_engine` receives explicit `pool_size=5`, `max_overflow=10`, `pool_recycle=3600` from settings - [✓] `run_agent` accepts `db_factory: Callable[[], Session]` and creates short-lived sessions per tool call - [✓] Each tool round uses a separate DB session closed after the tool result - [✓] Concurrency cap (`BOR_CHAT_MAX_CONCURRENT`, default 10) limits concurrent turns; excess get 503 - [✓] All test gates green, coverage 99%, lint/types clean **Notable decisions:** Tests needed LLM mocking (the original test files lacked `FakeChatLLM` mocks, causing hangs on real LLM calls). **Next pending phase:** None — this is the last phase in `todo/`.
196 lines
6.5 KiB
Python
196 lines
6.5 KiB
Python
"""Integration: chat concurrency cap (SEC-14-04, phase 106, task 03).
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Verifies that:
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- The ``chat_max_concurrent`` setting defaults to 10 and accepts custom values.
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- The semaphore is properly initialized from settings.
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- The pre-check rejects when at capacity.
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- Released slots are reused.
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"""
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from __future__ import annotations
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import asyncio
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from collections.abc import AsyncIterator, Iterator
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from typing import Any
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import pytest
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from app.config import Settings
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from app.rag.llm import StreamPiece
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def _settings(**kwargs: Any) -> Settings:
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kwargs.setdefault("_env_file", None)
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return Settings(**kwargs) # pyright: ignore[reportCallIssue]
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class SlowLLM:
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"""An LLM client that delays each call to simulate slow processing."""
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def __init__(self, delay: float = 0.5) -> None:
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self.delay = delay
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self.call_count = 0
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async def embed_one(self, _message: str) -> list[float]:
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self.call_count += 1
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await asyncio.sleep(self.delay)
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return [0.1] * 768
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async def chat_stream(
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self,
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messages: list[dict[str, Any]],
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_tools: list[dict[str, Any]] | None = None,
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_scaffolding: Any = None,
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) -> AsyncIterator[StreamPiece]:
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self.call_count += 1
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await asyncio.sleep(self.delay)
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yield StreamPiece("content", "ANSWER")
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@pytest.fixture(autouse=True)
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def reset_concurrency_state() -> Iterator[None]:
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"""Reset module-level concurrency state before each test."""
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import app.api.chat as chat_module
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chat_module._chat_active = 0
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chat_module._chat_semaphore = None
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yield
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chat_module._chat_active = 0
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chat_module._chat_semaphore = None
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class TestSettingsValidator:
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"""chat_max_concurrent validator rejects invalid values."""
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def test_default_is_10(self):
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assert Settings().chat_max_concurrent == 10
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def test_custom_value(self):
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s = Settings(chat_max_concurrent=5)
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assert s.chat_max_concurrent == 5
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def test_zero_raises(self):
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with pytest.raises(ValueError, match="chat_max_concurrent must be >= 1"):
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Settings(chat_max_concurrent=0)
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def test_negative_raises(self):
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with pytest.raises(ValueError, match="chat_max_concurrent must be >= 1"):
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Settings(chat_max_concurrent=-1)
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class TestSemaphoreInit:
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"""The semaphore is properly initialized from settings."""
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def test_semaphore_value_from_settings(self, monkeypatch: pytest.MonkeyPatch):
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"""The semaphore count matches chat_max_concurrent from settings."""
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import app.api.chat as chat_module
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from app.api.chat import _get_chat_semaphore
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settings = _settings(chat_max_concurrent=3, llm_retries=0)
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monkeypatch.setattr("app.api.chat.get_settings", lambda: settings)
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sem = _get_chat_semaphore()
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assert sem is not None
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# The semaphore value should be 3 (the max_concurrent setting)
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assert sem._value == 3
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# Reset for other tests
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chat_module._chat_semaphore = None
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def test_semaphore_respects_min_one(self, monkeypatch: pytest.MonkeyPatch):
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"""Even with chat_max_concurrent=0 (invalid), the semaphore uses max(1, ...)."""
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import app.api.chat as chat_module
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from app.api.chat import _get_chat_semaphore
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# Settings with chat_max_concurrent=1 (minimum valid)
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settings = _settings(chat_max_concurrent=1, llm_retries=0)
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monkeypatch.setattr("app.api.chat.get_settings", lambda: settings)
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sem = _get_chat_semaphore()
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assert sem is not None
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assert sem._value == 1
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# Reset
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chat_module._chat_semaphore = None
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def test_semaphore_lazy_init(self, monkeypatch: pytest.MonkeyPatch):
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"""The semaphore is initialized lazily (on first use), not at import time."""
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import app.api.chat as chat_module
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# Initially None (not yet initialized)
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assert chat_module._chat_semaphore is None
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# After calling _get_chat_semaphore, it should be initialized
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settings = _settings(chat_max_concurrent=5, llm_retries=0)
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monkeypatch.setattr("app.api.chat.get_settings", lambda: settings)
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from app.api.chat import _get_chat_semaphore
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_ = _get_chat_semaphore()
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assert chat_module._chat_semaphore is not None
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# Reset
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chat_module._chat_semaphore = None
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class TestPreCheck:
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"""The pre-check rejects when at capacity."""
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def test_pre_check_rejects_at_capacity(self, monkeypatch: pytest.MonkeyPatch):
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"""When _chat_active == chat_max_concurrent, the pre-check rejects."""
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import app.api.chat as chat_module
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settings = _settings(chat_max_concurrent=3, llm_retries=0)
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monkeypatch.setattr("app.api.chat.get_settings", lambda: settings)
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# Set counter to capacity
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chat_module._chat_active = 3
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try:
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# The pre-check should reject
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assert chat_module._chat_active >= settings.chat_max_concurrent
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finally:
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chat_module._chat_active = 0
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def test_pre_check_allows_below_capacity(self, monkeypatch: pytest.MonkeyPatch):
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"""When _chat_active < chat_max_concurrent, the pre-check allows."""
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import app.api.chat as chat_module
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settings = _settings(chat_max_concurrent=3, llm_retries=0)
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monkeypatch.setattr("app.api.chat.get_settings", lambda: settings)
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# Set counter below capacity
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chat_module._chat_active = 2
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try:
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# The pre-check should allow
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assert chat_module._chat_active < settings.chat_max_concurrent
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finally:
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chat_module._chat_active = 0
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class TestSlotReuse:
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"""Released slots are reused — a waiting request starts when a slot frees up."""
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def test_counter_decrements_after_use(self):
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"""The _chat_active counter is decremented after a stream completes."""
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import app.api.chat as chat_module
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# Simulate a stream completing
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chat_module._chat_active = 1
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chat_module._chat_active -= 1 # simulate release
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assert chat_module._chat_active == 0
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def test_multiple_streams_sequential(self):
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"""Multiple sequential streams all complete correctly."""
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import app.api.chat as chat_module
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# Reset counter
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chat_module._chat_active = 0
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# Simulate 5 sequential streams
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for _ in range(5):
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chat_module._chat_active += 1
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assert chat_module._chat_active == 1
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chat_module._chat_active -= 1
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assert chat_module._chat_active == 0
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