fixup! Implement ListComponents

Add active_at().

Author: llucax

src/frequenz/client/microgrid/component/_base.py

@@ -6,6 +6,7 @@
 import dataclasses
 import logging
 from collections.abc import Mapping
+from datetime import datetime, timezone
 from functools import cached_property
 from typing import Any, Self
 
@@ -97,16 +98,24 @@ def __new__(cls, *args: Any, **kwargs: Any) -> Self:
             raise TypeError(f"Cannot instantiate {cls.__name__} directly")
         return super().__new__(cls)
 
-    @cached_property
-    def active(self) -> bool:
-        """Whether this component is currently active."""
+    def active_at(self, timestamp: datetime) -> bool:
+        """Check whether this component is active at a specific timestamp."""
         if self.status is ComponentStatus.UNSPECIFIED:
-            # Because this is a cached property, the warning will only be logged once.
             _logger.warning(
                 "Component %s has an unspecified status. Assuming it is active.",
                 self,
             )
-        return self.status in (ComponentStatus.ACTIVE, ComponentStatus.UNSPECIFIED)
+            return self.operational_lifetime.active_at(timestamp)
+
+        return (
+            self.status is ComponentStatus.ACTIVE
+            and self.operational_lifetime.active_at(timestamp)
+        )
+
+    @cached_property
+    def active(self) -> bool:
+        """Whether this component is currently active."""
+        return self.active_at(datetime.now(timezone.utc))
 
     def __str__(self) -> str:
         """Return a human-readable string representation of this instance."""