Add blockbuster option to API (#5746)

* Add blockbuster option to API

* cache not lru_cache

supervisor/__main__.py

@@ -11,10 +11,12 @@ import zlib_fast
 # Enable fast zlib before importing supervisor
 zlib_fast.enable()
 
-from supervisor import bootstrap  # pylint: disable=wrong-import-position # noqa: E402
-from supervisor.utils.logging import (  # pylint: disable=wrong-import-position  # noqa: E402
-    activate_log_queue_handler,
-)
+# pylint: disable=wrong-import-position
+from supervisor import bootstrap  # noqa: E402
+from supervisor.utils.blockbuster import activate_blockbuster  # noqa: E402
+from supervisor.utils.logging import activate_log_queue_handler  # noqa: E402
+
+# pylint: enable=wrong-import-position
 
 _LOGGER: logging.Logger = logging.getLogger(__name__)
 
@@ -52,6 +54,8 @@ if __name__ == "__main__":
     _LOGGER.info("Initializing Supervisor setup")
     coresys = loop.run_until_complete(bootstrap.initialize_coresys())
     loop.set_debug(coresys.config.debug)
+    if coresys.config.detect_blocking_io:
+        activate_blockbuster()
     loop.run_until_complete(coresys.core.connect())
 
     loop.run_until_complete(bootstrap.supervisor_debugger(coresys))

supervisor/api/const.py

@@ -80,3 +80,11 @@ class BootSlot(StrEnum):
 
     A = "A"
     B = "B"
+
+
+class DetectBlockingIO(StrEnum):
+    """Enable/Disable detection for blocking I/O in event loop."""
+
+    OFF = "off"
+    ON = "on"
+    ON_AT_STARTUP = "on_at_startup"

supervisor/api/supervisor.py

@@ -20,6 +20,7 @@ from ..const import (
     ATTR_CPU_PERCENT,
     ATTR_DEBUG,
     ATTR_DEBUG_BLOCK,
+    ATTR_DETECT_BLOCKING_IO,
     ATTR_DIAGNOSTICS,
     ATTR_FORCE_SECURITY,
     ATTR_HEALTHY,
@@ -47,10 +48,15 @@ from ..const import (
 from ..coresys import CoreSysAttributes
 from ..exceptions import APIError
 from ..store.validate import repositories
+from ..utils.blockbuster import (
+    activate_blockbuster,
+    blockbuster_enabled,
+    deactivate_blockbuster,
+)
 from ..utils.sentry import close_sentry, init_sentry
 from ..utils.validate import validate_timezone
 from ..validate import version_tag, wait_boot
-from .const import CONTENT_TYPE_TEXT
+from .const import CONTENT_TYPE_TEXT, DetectBlockingIO
 from .utils import api_process, api_process_raw, api_validate
 
 _LOGGER: logging.Logger = logging.getLogger(__name__)
@@ -69,6 +75,7 @@ SCHEMA_OPTIONS = vol.Schema(
         vol.Optional(ATTR_CONTENT_TRUST): vol.Boolean(),
         vol.Optional(ATTR_FORCE_SECURITY): vol.Boolean(),
         vol.Optional(ATTR_AUTO_UPDATE): vol.Boolean(),
+        vol.Optional(ATTR_DETECT_BLOCKING_IO): vol.Coerce(DetectBlockingIO),
     }
 )
 
@@ -101,6 +108,7 @@ class APISupervisor(CoreSysAttributes):
             ATTR_DEBUG_BLOCK: self.sys_config.debug_block,
             ATTR_DIAGNOSTICS: self.sys_config.diagnostics,
             ATTR_AUTO_UPDATE: self.sys_updater.auto_update,
+            ATTR_DETECT_BLOCKING_IO: blockbuster_enabled(),
             # Depricated
             ATTR_WAIT_BOOT: self.sys_config.wait_boot,
             ATTR_ADDONS: [
@@ -160,6 +168,17 @@ class APISupervisor(CoreSysAttributes):
         if ATTR_AUTO_UPDATE in body:
             self.sys_updater.auto_update = body[ATTR_AUTO_UPDATE]
 
+        if detect_blocking_io := body.get(ATTR_DETECT_BLOCKING_IO):
+            if detect_blocking_io == DetectBlockingIO.ON_AT_STARTUP:
+                self.sys_config.detect_blocking_io = True
+                detect_blocking_io = DetectBlockingIO.ON
+
+            if detect_blocking_io == DetectBlockingIO.ON:
+                activate_blockbuster()
+            elif detect_blocking_io == DetectBlockingIO.OFF:
+                self.sys_config.detect_blocking_io = False
+                deactivate_blockbuster()
+
         # Deprecated
         if ATTR_WAIT_BOOT in body:
             self.sys_config.wait_boot = body[ATTR_WAIT_BOOT]

supervisor/config.py

@@ -12,6 +12,7 @@ from .const import (
     ATTR_ADDONS_CUSTOM_LIST,
     ATTR_DEBUG,
     ATTR_DEBUG_BLOCK,
+    ATTR_DETECT_BLOCKING_IO,
     ATTR_DIAGNOSTICS,
     ATTR_IMAGE,
     ATTR_LAST_BOOT,
@@ -142,6 +143,16 @@ class CoreConfig(FileConfiguration):
         """Set debug wait mode."""
         self._data[ATTR_DEBUG_BLOCK] = value
 
+    @property
+    def detect_blocking_io(self) -> bool:
+        """Return True if blocking I/O in event loop detection enabled at startup."""
+        return self._data[ATTR_DETECT_BLOCKING_IO]
+
+    @detect_blocking_io.setter
+    def detect_blocking_io(self, value: bool) -> None:
+        """Enable/Disable blocking I/O in event loop detection at startup."""
+        self._data[ATTR_DETECT_BLOCKING_IO] = value
+
     @property
     def diagnostics(self) -> bool | None:
         """Return bool if diagnostics is set otherwise None."""

supervisor/const.py

@@ -152,6 +152,7 @@ ATTR_DEFAULT = "default"
 ATTR_DEPLOYMENT = "deployment"
 ATTR_DESCRIPTON = "description"
 ATTR_DETACHED = "detached"
+ATTR_DETECT_BLOCKING_IO = "detect_blocking_io"
 ATTR_DEVICES = "devices"
 ATTR_DEVICETREE = "devicetree"
 ATTR_DIAGNOSTICS = "diagnostics"

supervisor/utils/blockbuster.py

@@ -0,0 +1,35 @@
+"""Activate and deactivate blockbuster for finding blocking I/O."""
+
+from functools import cache
+import logging
+
+from blockbuster import BlockBuster
+
+_LOGGER: logging.Logger = logging.getLogger(__name__)
+
+
+@cache
+def _get_blockbuster() -> BlockBuster:
+    """Get blockbuster instance."""
+    return BlockBuster()
+
+
+def blockbuster_enabled() -> bool:
+    """Return true if blockbuster detection is enabled."""
+    blockbuster = _get_blockbuster()
+    # We activate all or none so just check the first one
+    for _, fn in blockbuster.functions.items():
+        return fn.activated
+    return False
+
+
+def activate_blockbuster() -> None:
+    """Activate blockbuster detection."""
+    _LOGGER.info("Activating BlockBuster blocking I/O detection")
+    _get_blockbuster().activate()
+
+
+def deactivate_blockbuster() -> None:
+    """Deactivate blockbuster detection."""
+    _LOGGER.info("Deactivating BlockBuster blocking I/O detection")
+    _get_blockbuster().deactivate()

supervisor/validate.py

@@ -15,6 +15,7 @@ from .const import (
     ATTR_CONTENT_TRUST,
     ATTR_DEBUG,
     ATTR_DEBUG_BLOCK,
+    ATTR_DETECT_BLOCKING_IO,
     ATTR_DIAGNOSTICS,
     ATTR_DISPLAYNAME,
     ATTR_DNS,
@@ -162,6 +163,7 @@ SCHEMA_SUPERVISOR_CONFIG = vol.Schema(
         vol.Optional(ATTR_DEBUG, default=False): vol.Boolean(),
         vol.Optional(ATTR_DEBUG_BLOCK, default=False): vol.Boolean(),
         vol.Optional(ATTR_DIAGNOSTICS, default=None): vol.Maybe(vol.Boolean()),
+        vol.Optional(ATTR_DETECT_BLOCKING_IO, default=False): vol.Boolean(),
     },
     extra=vol.REMOVE_EXTRA,
 )

tests/api/test_supervisor.py

@@ -1,9 +1,11 @@
 """Test Supervisor API."""
 
 # pylint: disable=protected-access
+import time
 from unittest.mock import MagicMock, patch
 
 from aiohttp.test_utils import TestClient
+from blockbuster import BlockingError
 import pytest
 
 from supervisor.coresys import CoreSys
@@ -247,3 +249,46 @@ async def test_api_supervisor_options_timezone(
     assert resp.status == 200
 
     assert coresys.timezone == "Europe/Zurich"
+
+
+@pytest.mark.parametrize(
+    ("blockbuster", "option_value", "config_value"),
+    [("no_blockbuster", "on", False), ("no_blockbuster", "on_at_startup", True)],
+    indirect=["blockbuster"],
+)
+async def test_api_supervisor_options_blocking_io(
+    api_client: TestClient, coresys: CoreSys, option_value: str, config_value: bool
+):
+    """Test setting supervisor detect blocking io option."""
+    # This should not fail with a blocking error yet
+    time.sleep(0)
+
+    resp = await api_client.post(
+        "/supervisor/options", json={"detect_blocking_io": option_value}
+    )
+    assert resp.status == 200
+
+    resp = await api_client.get("/supervisor/info")
+    assert resp.status == 200
+    body = await resp.json()
+    assert body["data"]["detect_blocking_io"] is True
+
+    # This remains false because we only turned it on for current run of supervisor, not permanently
+    assert coresys.config.detect_blocking_io is config_value
+
+    with pytest.raises(BlockingError):
+        time.sleep(0)
+
+    resp = await api_client.post(
+        "/supervisor/options", json={"detect_blocking_io": "off"}
+    )
+    assert resp.status == 200
+
+    resp = await api_client.get("/supervisor/info")
+    assert resp.status == 200
+    body = await resp.json()
+    assert body["data"]["detect_blocking_io"] is False
+    assert coresys.config.detect_blocking_io is False
+
+    # This should not raise blocking error anymore
+    time.sleep(0)

tests/conftest.py

@@ -65,8 +65,12 @@ from .dbus_service_mocks.network_manager import NetworkManager as NetworkManager
 
 
 @pytest.fixture(autouse=True)
-def blockbuster() -> BlockBuster:
+def blockbuster(request: pytest.FixtureRequest) -> BlockBuster | None:
     """Raise for blocking I/O in event loop."""
+    if getattr(request, "param", "") == "no_blockbuster":
+        yield None
+        return
+
     # Only scanning supervisor code for now as that's our primary interest
     # This will still raise for tests that call utilities in supervisor code that block
     # But it will ignore calls to libraries and such that do blocking I/O directly from tests