Avoid crashing on childdevice property accesses (#732)

* Avoid crashing on childdevice property accesses

* Push updates from parent to child

kasa/emeterstatus.py

@@ -79,8 +79,11 @@ def __getitem__(self, item):
                 return super().__getitem__(item[: item.find("_")]) * 1000
             else:  # downscale
                 for i in super().keys():  # noqa: SIM118
-                    if i.startswith(item):
-                        return self.__getitem__(i) / 1000
+                    if (
+                        i.startswith(item)
+                        and (value := self.__getitem__(i)) is not None
+                    ):
+                        return value / 1000
 
                 _LOGGER.debug(f"Unable to find value for '{item}'")
                 return None

kasa/tapo/childdevice.py

@@ -1,8 +1,8 @@
 """Child device implementation."""
-from typing import Dict, Optional
+from typing import Optional
 
+from ..device_type import DeviceType
 from ..deviceconfig import DeviceConfig
-from ..exceptions import SmartDeviceException
 from ..smartprotocol import SmartProtocol, _ChildProtocolWrapper
 from .tapodevice import TapoDevice
 
@@ -24,21 +24,18 @@ def __init__(
         self._parent = parent
         self._id = child_id
         self.protocol = _ChildProtocolWrapper(child_id, parent.protocol)
+        # TODO: remove the assignment after modularization is done,
+        #  currently required to allow accessing time-related properties
+        self._time = parent._time
+        self._device_type = DeviceType.StripSocket
 
     async def update(self, update_children: bool = True):
-        """We just set the info here accordingly."""
+        """Noop update. The parent updates our internals."""
 
-        def _get_child_info() -> Dict:
-            """Return the subdevice information for this device."""
-            for child in self._parent._last_update["child_info"]["child_device_list"]:
-                if child["device_id"] == self._id:
-                    return child
-
-            raise SmartDeviceException(
-                f"Unable to find child device with id {self._id}"
-            )
-
-        self._last_update = self._sys_info = self._info = _get_child_info()
+    def update_internal_state(self, info):
+        """Set internal state for the child."""
+        # TODO: cleanup the _last_update, _sys_info, _info, _data mess.
+        self._last_update = self._sys_info = self._info = info
 
     def __repr__(self):
         return f"<ChildDevice {self.alias} of {self._parent}>"

kasa/tapo/tapodevice.py

@@ -2,7 +2,7 @@
 import base64
 import logging
 from datetime import datetime, timedelta, timezone
-from typing import Any, Dict, List, Optional, Set, cast
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Set, cast
 
 from ..aestransport import AesTransport
 from ..device_type import DeviceType
@@ -15,6 +15,9 @@
 
 _LOGGER = logging.getLogger(__name__)
 
+if TYPE_CHECKING:
+    from .childdevice import ChildDevice
+
 
 class TapoDevice(SmartDevice):
     """Base class to represent a TAPO device."""
@@ -32,20 +35,40 @@ def __init__(
         super().__init__(host=host, config=config, protocol=_protocol)
         self.protocol: SmartProtocol
         self._components_raw: Optional[Dict[str, Any]] = None
-        self._components: Dict[str, int]
+        self._components: Dict[str, int] = {}
+        self._children: Dict[str, "ChildDevice"] = {}
+        self._energy: Dict[str, Any] = {}
         self._state_information: Dict[str, Any] = {}
 
     async def _initialize_children(self):
+        """Initialize children for power strips."""
         children = self._last_update["child_info"]["child_device_list"]
         # TODO: Use the type information to construct children,
         #  as hubs can also have them.
         from .childdevice import ChildDevice
 
-        self.children = [
-            ChildDevice(parent=self, child_id=child["device_id"]) for child in children
-        ]
+        self._children = {
+            child["device_id"]: ChildDevice(parent=self, child_id=child["device_id"])
+            for child in children
+        }
         self._device_type = DeviceType.Strip
 
+    @property
+    def children(self):
+        """Return list of children.
+
+        This is just to keep the existing SmartDevice API intact.
+        """
+        return list(self._children.values())
+
+    @children.setter
+    def children(self, children):
+        """Initialize from a list of children.
+
+        This is just to keep the existing SmartDevice API intact.
+        """
+        self._children = {child["device_id"]: child for child in children}
+
     async def update(self, update_children: bool = True):
         """Update the device."""
         if self.credentials is None and self.credentials_hash is None:
@@ -88,7 +111,7 @@ async def update(self, update_children: bool = True):
         self._energy = resp.get("get_energy_usage", {})
         self._emeter = resp.get("get_current_power", {})
 
-        self._last_update = self._data = {
+        self._last_update = {
             "components": self._components_raw,
             "info": self._info,
             "usage": self._usage,
@@ -98,13 +121,13 @@ async def update(self, update_children: bool = True):
             "child_info": resp.get("get_child_device_list", {}),
         }
 
-        if self._last_update["child_info"]:
+        if child_info := self._last_update.get("child_info"):
             if not self.children:
                 await self._initialize_children()
-            for child in self.children:
-                await child.update()
+            for info in child_info["child_device_list"]:
+                self._children[info["device_id"]].update_internal_state(info)
 
-        _LOGGER.debug("Got an update: %s", self._data)
+        _LOGGER.debug("Got an update: %s", self._last_update)
 
     async def _initialize_modules(self):
         """Initialize modules based on component negotiation response."""
@@ -192,7 +215,7 @@ def device_id(self) -> str:
     @property
     def internal_state(self) -> Any:
         """Return all the internal state data."""
-        return self._data
+        return self._last_update
 
     async def _query_helper(
         self, target: str, cmd: str, arg: Optional[Dict] = None, child_ids=None
@@ -204,10 +227,13 @@ async def _query_helper(
     @property
     def state_information(self) -> Dict[str, Any]:
         """Return the key state information."""
+        ssid = self._info.get("ssid")
+        ssid = base64.b64decode(ssid).decode() if ssid else "No SSID"
+
         return {
             "overheated": self._info.get("overheated"),
             "signal_level": self._info.get("signal_level"),
-            "SSID": base64.b64decode(str(self._info.get("ssid"))).decode(),
+            "SSID": ssid,
         }
 
     @property

kasa/tests/test_childdevice.py

@@ -1,4 +1,10 @@
+import inspect
+import sys
+
+import pytest
+
 from kasa.smartprotocol import _ChildProtocolWrapper
+from kasa.tapo.childdevice import ChildDevice
 
 from .conftest import strip_smart
 
@@ -19,12 +25,48 @@ def test_childdevice_init(dev, dummy_protocol, mocker):
 @strip_smart
 async def test_childdevice_update(dev, dummy_protocol, mocker):
     """Test that parent update updates children."""
-    assert len(dev.children) > 0
+    child_info = dev._last_update["child_info"]
+    child_list = child_info["child_device_list"]
+
+    assert len(dev.children) == child_info["sum"]
     first = dev.children[0]
 
-    child_update = mocker.patch.object(first, "update")
     await dev.update()
-    child_update.assert_called()
 
     assert dev._last_update != first._last_update
-    assert dev._last_update["child_info"]["child_device_list"][0] == first._last_update
+    assert child_list[0] == first._last_update
+
+
+@strip_smart
+@pytest.mark.skipif(
+    sys.version_info < (3, 11),
+    reason="exceptiongroup requires python3.11+",
+)
+async def test_childdevice_properties(dev: ChildDevice):
+    """Check that accessing childdevice properties do not raise exceptions."""
+    assert len(dev.children) > 0
+
+    first = dev.children[0]
+    assert first.is_strip_socket
+
+    # children do not have children
+    assert not first.children
+
+    def _test_property_getters():
+        """Try accessing all properties and return a list of encountered exceptions."""
+        exceptions = []
+        properties = inspect.getmembers(
+            first.__class__, lambda o: isinstance(o, property)
+        )
+        for prop in properties:
+            name, _ = prop
+            try:
+                _ = getattr(first, name)
+            except Exception as ex:
+                exceptions.append(ex)
+
+        return exceptions
+
+    exceptions = list(_test_property_getters())
+    if exceptions:
+        raise ExceptionGroup("Accessing child properties caused exceptions", exceptions)