From 52657acf35e26feb6fae58890aef043d30e966e5 Mon Sep 17 00:00:00 2001 From: cayossarian <23534755+cayossarian@users.noreply.github.com> Date: Mon, 30 Mar 2026 23:46:43 -0700 Subject: [PATCH 1/3] Fix blocking load_verify_locations call in event loop Move SSL context creation to an executor thread in _get_client so httpx.AsyncClient no longer triggers a synchronous ssl.SSLContext.load_verify_locations() on the event loop. Bump version to 2.4.2. --- CHANGELOG.md | 7 +++++++ pyproject.toml | 2 +- src/span_panel_api/_http.py | 15 ++++++++++++++- tests/test_auth_and_homie_helpers.py | 7 +++++-- tests/test_detection_auth.py | 18 +++++++++++++++--- uv.lock | 20 +++++++++++++++++++- 6 files changed, 61 insertions(+), 8 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index d2336d5..28f3e6b 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). +## [2.4.2] - 03/2026 + +### Fixed + +- **Moved SSL context creation to executor** — `httpx.AsyncClient()` eagerly calls `ssl.SSLContext.load_verify_locations()` with the system CA bundle, which is a blocking file I/O operation that triggers Home Assistant's event loop protection. The SSL + context is now created in an executor thread and passed to httpx via `verify=ctx`. + ## [2.4.1] - 03/2026 ### Fixed diff --git a/pyproject.toml b/pyproject.toml index 3c81b2a..3544bcb 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -1,6 +1,6 @@ [project] name = "span-panel-api" -version = "2.4.1" +version = "2.4.2" description = "A client library for SPAN Panel API" authors = [ {name = "SpanPanel"} diff --git a/src/span_panel_api/_http.py b/src/span_panel_api/_http.py index 5b346a0..eeeec2e 100644 --- a/src/span_panel_api/_http.py +++ b/src/span_panel_api/_http.py @@ -2,8 +2,10 @@ from __future__ import annotations +import asyncio from collections.abc import AsyncIterator from contextlib import asynccontextmanager +import ssl import httpx @@ -15,6 +17,16 @@ def _build_url(host: str, port: int, path: str) -> str: return f"http://{host}:{port}{path}" +async def _create_ssl_context() -> ssl.SSLContext: + """Create a default SSL context in an executor to avoid blocking the event loop. + + ``ssl.create_default_context()`` calls ``load_verify_locations`` which + performs blocking file I/O on the system CA bundle. + """ + loop = asyncio.get_running_loop() + return await loop.run_in_executor(None, ssl.create_default_context) + + @asynccontextmanager async def _get_client( httpx_client: httpx.AsyncClient | None, @@ -23,5 +35,6 @@ async def _get_client( if httpx_client is not None: yield httpx_client return - async with httpx.AsyncClient(timeout=timeout) as client: + ctx = await _create_ssl_context() + async with httpx.AsyncClient(timeout=timeout, verify=ctx) as client: yield client diff --git a/tests/test_auth_and_homie_helpers.py b/tests/test_auth_and_homie_helpers.py index 2db54e6..7499528 100644 --- a/tests/test_auth_and_homie_helpers.py +++ b/tests/test_auth_and_homie_helpers.py @@ -145,7 +145,10 @@ async def test_download_ca_cert_fallback_uses_timeout_for_client(self) -> None: headers={"content-type": "text/plain"}, request=httpx.Request("GET", "http://test"), ) - with patch("span_panel_api._http.httpx.AsyncClient") as cls: + with ( + patch("span_panel_api._http.httpx.AsyncClient") as cls, + patch("span_panel_api._http._create_ssl_context", new_callable=AsyncMock) as mock_ctx, + ): mock_client = AsyncMock() mock_client.get.return_value = mock_response mock_client.__aenter__ = AsyncMock(return_value=mock_client) @@ -154,7 +157,7 @@ async def test_download_ca_cert_fallback_uses_timeout_for_client(self) -> None: await download_ca_cert("192.168.1.1", timeout=88.5) - cls.assert_called_once_with(timeout=88.5) + cls.assert_called_once_with(timeout=88.5, verify=mock_ctx.return_value) @pytest.mark.asyncio async def test_get_homie_schema_injected_skips_constructor(self) -> None: diff --git a/tests/test_detection_auth.py b/tests/test_detection_auth.py index 68390ee..6110732 100644 --- a/tests/test_detection_auth.py +++ b/tests/test_detection_auth.py @@ -52,7 +52,10 @@ async def test_get_client_yields_injected_client_without_closing(self) -> None: @pytest.mark.asyncio async def test_get_client_creates_and_closes_fallback_client(self) -> None: - with patch("span_panel_api._http.httpx.AsyncClient") as mock_cls: + with ( + patch("span_panel_api._http.httpx.AsyncClient") as mock_cls, + patch("span_panel_api._http._create_ssl_context", new_callable=AsyncMock) as mock_ctx, + ): mock_instance = AsyncMock() mock_instance.__aenter__ = AsyncMock(return_value=mock_instance) mock_instance.__aexit__ = AsyncMock(return_value=False) @@ -63,6 +66,7 @@ async def test_get_client_creates_and_closes_fallback_client(self) -> None: mock_cls.assert_called_once_with( timeout=12.5, + verify=mock_ctx.return_value, ) mock_instance.__aenter__.assert_awaited_once() mock_instance.__aexit__.assert_awaited_once() @@ -135,7 +139,10 @@ async def test_register_v2_uses_injected_client_and_does_not_close(self) -> None @pytest.mark.asyncio async def test_fallback_client_uses_register_v2_timeout(self) -> None: mock_response = _mock_response(200, V2_AUTH_JSON) - with patch("span_panel_api._http.httpx.AsyncClient") as mock_client_cls: + with ( + patch("span_panel_api._http.httpx.AsyncClient") as mock_client_cls, + patch("span_panel_api._http._create_ssl_context", new_callable=AsyncMock) as mock_ctx, + ): mock_client = AsyncMock() mock_client.post.return_value = mock_response mock_client.__aenter__ = AsyncMock(return_value=mock_client) @@ -146,6 +153,7 @@ async def test_fallback_client_uses_register_v2_timeout(self) -> None: mock_client_cls.assert_called_once_with( timeout=42.5, + verify=mock_ctx.return_value, ) @pytest.mark.asyncio @@ -179,7 +187,10 @@ async def test_detect_api_version_uses_injected_client(self) -> None: @pytest.mark.asyncio async def test_detect_api_version_fallback_uses_timeout(self) -> None: mock_response = _mock_response(200, V2_STATUS_JSON) - with patch("span_panel_api._http.httpx.AsyncClient") as 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00:00:00 2001 From: cayossarian <23534755+cayossarian@users.noreply.github.com> Date: Tue, 31 Mar 2026 01:02:44 -0700 Subject: [PATCH 2/3] Cache SSLContext to avoid repeated CA-bundle loads The SSLContext created for fallback httpx clients is now cached at module scope with double-checked locking so the executor-based ssl.create_default_context() call only runs once per process. --- src/span_panel_api/_http.py | 34 ++++++++++++++++++++++++++++++---- tests/conftest.py | 9 +++++++++ 2 files changed, 39 insertions(+), 4 deletions(-) diff --git a/src/span_panel_api/_http.py b/src/span_panel_api/_http.py index eeeec2e..7feeebb 100644 --- a/src/span_panel_api/_http.py +++ b/src/span_panel_api/_http.py @@ -5,11 +5,29 @@ import asyncio from collections.abc import AsyncIterator from contextlib import asynccontextmanager +from dataclasses import dataclass, field import ssl import httpx +@dataclass +class _SSLCache: + """Mutable container for the cached SSLContext and its async lock.""" + + context: ssl.SSLContext | None = None + lock: asyncio.Lock | None = field(default=None, repr=False) + + def get_lock(self) -> asyncio.Lock: + """Return the async lock, creating it lazily.""" + if self.lock is None: + self.lock = asyncio.Lock() + return self.lock + + +_ssl_cache = _SSLCache() + + def _build_url(host: str, port: int, path: str) -> str: """Build an HTTP URL, omitting the port when it is the default (80).""" if port == 80: @@ -18,13 +36,21 @@ def _build_url(host: str, port: int, path: str) -> str: async def _create_ssl_context() -> ssl.SSLContext: - """Create a default SSL context in an executor to avoid blocking the event loop. + """Return a cached default SSL context, creating it in an executor on first call. ``ssl.create_default_context()`` calls ``load_verify_locations`` which - performs blocking file I/O on the system CA bundle. + performs blocking file I/O on the system CA bundle. The resulting context + is thread-safe and reusable, so we cache it for the lifetime of the process. """ - loop = asyncio.get_running_loop() - return await loop.run_in_executor(None, ssl.create_default_context) + if _ssl_cache.context is not None: + return _ssl_cache.context + async with _ssl_cache.get_lock(): + # Double-check after acquiring the lock. + if _ssl_cache.context is not None: + return _ssl_cache.context + loop = asyncio.get_running_loop() + _ssl_cache.context = await loop.run_in_executor(None, ssl.create_default_context) + return _ssl_cache.context @asynccontextmanager diff --git a/tests/conftest.py b/tests/conftest.py index 9cb7e35..0e1af39 100644 --- a/tests/conftest.py +++ b/tests/conftest.py @@ -13,9 +13,18 @@ from paho.mqtt.client import ConnectFlags from paho.mqtt.reasoncodes import ReasonCode +import span_panel_api._http as _http_mod from span_panel_api.models import V2HomieSchema from span_panel_api.mqtt.const import TOPIC_PREFIX, TYPE_CORE + +@pytest.fixture(autouse=True) +def _reset_ssl_cache() -> None: + """Ensure the module-level SSL context cache doesn't leak between tests.""" + _http_mod._ssl_cache.context = None + _http_mod._ssl_cache.lock = None + + # --------------------------------------------------------------------------- # Constants shared across MQTT tests # --------------------------------------------------------------------------- From 23f3302e072ae904722fc646b7e41749bd639995 Mon Sep 17 00:00:00 2001 From: cayossarian <23534755+cayossarian@users.noreply.github.com> Date: Tue, 31 Mar 2026 01:05:43 -0700 Subject: [PATCH 3/3] Update CI and release workflows to Python 3.14 --- .github/workflows/ci.yml | 7 +++---- .github/workflows/release.yml | 2 +- 2 files changed, 4 insertions(+), 5 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 44a07f2..569b1c5 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -11,7 +11,7 @@ jobs: runs-on: ubuntu-latest strategy: matrix: - python-version: ["3.13", "3.14"] + python-version: ["3.14"] steps: - name: Checkout code @@ -21,7 +21,6 @@ jobs: uses: actions/setup-python@v6 with: python-version: ${{ matrix.python-version }} - allow-prereleases: true - name: Install uv uses: astral-sh/setup-uv@v7 @@ -50,7 +49,7 @@ jobs: - name: Set up Python uses: actions/setup-python@v6 with: - python-version: "3.13" + python-version: "3.14" - name: Install uv uses: astral-sh/setup-uv@v7 @@ -79,7 +78,7 @@ jobs: - name: Set up Python uses: actions/setup-python@v6 with: - python-version: "3.13" + python-version: "3.14" - name: Install uv uses: astral-sh/setup-uv@v7 diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml index 21d5c1c..52d3191 100644 --- a/.github/workflows/release.yml +++ b/.github/workflows/release.yml @@ -18,7 +18,7 @@ jobs: - name: Set up Python uses: actions/setup-python@v6 with: - python-version: "3.13" + python-version: "3.14" - name: Install uv uses: astral-sh/setup-uv@v7