Support smart child modules queries (#967)

Required for the P300 firmware update with `auto_off` module on child
devices. Will query child modules for parent devices that are not hubs.

Coverage will be fixed when the P300 fixture is added
https://github.com/python-kasa/python-kasa/pull/915

kasa/smart/modules/autooff.py

@@ -99,3 +99,11 @@ class AutoOff(SmartModule):
         sysinfo = self._device.sys_info
 
         return self._device.time + timedelta(seconds=sysinfo["auto_off_remain_time"])
+
+    async def _check_supported(self):
+        """Additional check to see if the module is supported by the device.
+
+        Parent devices that report components of children such as P300 will not have
+        the auto_off_status is sysinfo.
+        """
+        return "auto_off_status" in self._device.sys_info

kasa/smart/smartchilddevice.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import logging
+from typing import Any
 
 from ..device_type import DeviceType
 from ..deviceconfig import DeviceConfig
@@ -34,7 +35,17 @@ class SmartChildDevice(SmartDevice):
         self.protocol = _ChildProtocolWrapper(self._id, parent.protocol)
 
     async def update(self, update_children: bool = True):
-        """Noop update. The parent updates our internals."""
+        """Update child module info.
+
+        The parent updates our internal info so just update modules with
+        their own queries.
+        """
+        req: dict[str, Any] = {}
+        for module in self.modules.values():
+            if mod_query := module.query():
+                req.update(mod_query)
+        if req:
+            self._last_update = await self.protocol.query(req)
 
     @classmethod
     async def create(cls, parent: SmartDevice, child_info, child_components):

kasa/smart/smartdevice.py

@@ -149,7 +149,7 @@ class SmartDevice(Device):
         if "child_device" in self._components and not self.children:
             await self._initialize_children()
 
-    async def update(self, update_children: bool = True):
+    async def update(self, update_children: bool = False):
         """Update the device."""
         if self.credentials is None and self.credentials_hash is None:
             raise AuthenticationError("Tapo plug requires authentication.")
@@ -167,9 +167,14 @@ class SmartDevice(Device):
         self._last_update = resp = await self.protocol.query(req)
 
         self._info = self._try_get_response(resp, "get_device_info")
+
+        # Call child update which will only update module calls, info is updated
+        # from get_child_device_list. update_children only affects hub devices, other
+        # devices will always update children to prevent errors on module access.
+        if update_children or self.device_type != DeviceType.Hub:
+            for child in self._children.values():
+                await child.update()
         if child_info := self._try_get_response(resp, "get_child_device_list", {}):
-            # TODO: we don't currently perform queries on children based on modules,
-            #  but just update the information that is returned in the main query.
             for info in child_info["child_device_list"]:
                 self._children[info["device_id"]]._update_internal_state(info)
 
@@ -352,8 +357,7 @@ class SmartDevice(Device):
     @property
     def time(self) -> datetime:
         """Return the time."""
-        # TODO: Default to parent's time module for child devices
+        if self._parent and Module.Time in self._parent.modules:
-        if self._parent and Module.Time in self.modules:
             _timemod = self._parent.modules[Module.Time]
         else:
             _timemod = self.modules[Module.Time]

kasa/tests/fakeprotocol_smart.py

@@ -149,6 +149,11 @@ class FakeSmartTransport(BaseTransport):
             if child["device_id"] == device_id:
                 info = child
                 break
+        # Create the child_devices fixture section for fixtures generated before it was added
+        if "child_devices" not in self.info:
+            self.info["child_devices"] = {}
+        # Get the method calls made directly on the child devices
+        child_device_calls = self.info["child_devices"].setdefault(device_id, {})
 
         # We only support get & set device info for now.
         if child_method == "get_device_info":
@@ -159,14 +164,27 @@ class FakeSmartTransport(BaseTransport):
             return {"error_code": 0}
         elif child_method == "set_preset_rules":
             return self._set_child_preset_rules(info, child_params)
+        elif child_method in child_device_calls:
+            result = copy.deepcopy(child_device_calls[child_method])
+            return {"result": result, "error_code": 0}
         elif (
             # FIXTURE_MISSING is for service calls not in place when
             # SMART fixtures started to be generated
             missing_result := self.FIXTURE_MISSING_MAP.get(child_method)
         ) and missing_result[0] in self.components:
-            result = copy.deepcopy(missing_result[1])
+            # Copy to info so it will work with update methods
+            child_device_calls[child_method] = copy.deepcopy(missing_result[1])
+            result = copy.deepcopy(info[child_method])
             retval = {"result": result, "error_code": 0}
             return retval
+        elif child_method[:4] == "set_":
+            target_method = f"get_{child_method[4:]}"
+            if target_method not in child_device_calls:
+                raise RuntimeError(
+                    f"No {target_method} in child info, calling set before get not supported."
+                )
+            child_device_calls[target_method].update(child_params)
+            return {"error_code": 0}
         else:
             # PARAMS error returned for KS240 when get_device_usage called
             # on parent device.  Could be any error code though.

kasa/tests/smart/modules/test_autooff.py

@@ -9,7 +9,7 @@ from pytest_mock import MockerFixture
 
 from kasa import Module
 from kasa.smart import SmartDevice
-from kasa.tests.device_fixtures import parametrize
+from kasa.tests.device_fixtures import get_parent_and_child_modules, parametrize
 
 autooff = parametrize(
     "has autooff", component_filter="auto_off", protocol_filter={"SMART"}
@@ -33,13 +33,13 @@ async def test_autooff_features(
     dev: SmartDevice, feature: str, prop_name: str, type: type
 ):
     """Test that features are registered and work as expected."""
-    autooff = dev.modules.get(Module.AutoOff)
+    autooff = next(get_parent_and_child_modules(dev, Module.AutoOff))
     assert autooff is not None
 
     prop = getattr(autooff, prop_name)
     assert isinstance(prop, type)
 
-    feat = dev.features[feature]
+    feat = autooff._device.features[feature]
     assert feat.value == prop
     assert isinstance(feat.value, type)
 
@@ -47,13 +47,13 @@ async def test_autooff_features(
 @autooff
 async def test_settings(dev: SmartDevice, mocker: MockerFixture):
     """Test autooff settings."""
-    autooff = dev.modules.get(Module.AutoOff)
+    autooff = next(get_parent_and_child_modules(dev, Module.AutoOff))
     assert autooff
 
-    enabled = dev.features["auto_off_enabled"]
+    enabled = autooff._device.features["auto_off_enabled"]
     assert autooff.enabled == enabled.value
 
-    delay = dev.features["auto_off_minutes"]
+    delay = autooff._device.features["auto_off_minutes"]
     assert autooff.delay == delay.value
 
     call = mocker.spy(autooff, "call")
@@ -86,10 +86,10 @@ async def test_auto_off_at(
     dev: SmartDevice, mocker: MockerFixture, is_timer_active: bool
 ):
     """Test auto-off at sensor."""
-    autooff = dev.modules.get(Module.AutoOff)
+    autooff = next(get_parent_and_child_modules(dev, Module.AutoOff))
     assert autooff
 
-    autooff_at = dev.features["auto_off_at"]
+    autooff_at = autooff._device.features["auto_off_at"]
 
     mocker.patch.object(
         type(autooff),

kasa/tests/test_smartdevice.py

@@ -9,7 +9,7 @@ from unittest.mock import patch
 import pytest
 from pytest_mock import MockerFixture
 
-from kasa import KasaException, Module
+from kasa import Device, KasaException, Module
 from kasa.exceptions import SmartErrorCode
 from kasa.smart import SmartDevice
 
@@ -112,6 +112,11 @@ async def test_update_module_queries(dev: SmartDevice, mocker: MockerFixture):
     device_queries: dict[SmartDevice, dict[str, Any]] = {}
     for mod in dev._modules.values():
         device_queries.setdefault(mod._device, {}).update(mod.query())
+    # Hubs do not query child modules by default.
+    if dev.device_type != Device.Type.Hub:
+        for child in dev.children:
+            for mod in child.modules.values():
+                device_queries.setdefault(mod._device, {}).update(mod.query())
 
     spies = {}
     for device in device_queries:
@@ -120,7 +125,8 @@ async def test_update_module_queries(dev: SmartDevice, mocker: MockerFixture):
     await dev.update()
     for device in device_queries:
         if device_queries[device]:
-            spies[device].assert_called_with(device_queries[device])
+            # Need assert any here because the child device updates use the parent's protocol
+            spies[device].assert_any_call(device_queries[device])
         else:
             spies[device].assert_not_called()