Merge tag 'v0.3.3' into v0.x.x

- A new module `frequenz.client.common.enum_proto` has been added, which provides a generic `enum_from_proto()` function to convert protobuf enums to Python enums.
- Documentation for some `frequenz.client.common.microgrid.electrical_components.ElectricalComponentCategory` values was improved.
- The metrics and components enums `.from_proto()` are deprecated, please use the new `enum_from_proto()` instead.
- Classes to represent microgrid-related ID were added (`MicrogridId`, `EnterpriseId`, `ElectricalComponentId`, and `SensorId`).

* tag 'v0.3.3':
  Update release notes
  Bump the minimum version of `frequenz-core` to 1.0.2
  Deprecate uses of enum's `.from_proto()`
  Add a generic `enum_from_proto()` function
  Add the `HVAC` component category
  Add missing component categories
  Make enums unique
  Clear release notes
  Fix dependencies and prepare release notes for v0.3.2 release
  Clear release notes
  Add release notes
  Add microgrid-related ID types
  Fix warning filtering in pytest configuration

Author: llucax

pyproject.toml

@@ -26,8 +26,9 @@ classifiers = [
 ]
 requires-python = ">= 3.11, < 4"
 dependencies = [
-  "typing-extensions >= 4.6.0, < 5",
+  "typing-extensions >= 4.13.0, < 5",
   "frequenz-api-common @ git+https://github.com/frequenz-floss/frequenz-api-common.git@2e89add6a16d42b23612f0f791a499919f3738ed",
+  "frequenz-core >= 1.0.2, < 2",
 ]
 dynamic = ["version"]
 
@@ -149,8 +150,11 @@ filterwarnings = [
   "error",
   "once::DeprecationWarning",
   "once::PendingDeprecationWarning",
-  # We use a raw string (single quote) to avoid the need to escape special
-  # chars as this is a regex
+  # We ignore warnings about protobuf gencode version being one version older
+  # than the current version, as this is supported by protobuf, and we expect to
+  # have such cases. If we go too far, we will get a proper error anyways.
+  # We use a raw string (single quotes) to avoid the need to escape special
+  # characters as this is a regex.
   'ignore:Protobuf gencode version .*exactly one major version older.*:UserWarning',
 ]
 testpaths = ["tests", "src"]

src/frequenz/client/common/enum_proto.py

@@ -0,0 +1,76 @@
+# License: MIT
+# Copyright © 2025 Frequenz Energy-as-a-Service GmbH
+
+"""Conversion of protobuf int enums to Python enums."""
+
+import enum
+from typing import Literal, TypeVar, overload
+
+EnumT = TypeVar("EnumT", bound=enum.Enum)
+"""A type variable that is bound to an enum."""
+
+
+@overload
+def enum_from_proto(
+    value: int, enum_type: type[EnumT], *, allow_invalid: Literal[False]
+) -> EnumT: ...
+
+
+@overload
+def enum_from_proto(
+    value: int, enum_type: type[EnumT], *, allow_invalid: Literal[True] = True
+) -> EnumT | int: ...
+
+
+def enum_from_proto(
+    value: int, enum_type: type[EnumT], *, allow_invalid: bool = True
+) -> EnumT | int:
+    """Convert a protobuf int enum value to a python enum.
+
+    Example:
+        ```python
+        import enum
+
+        from proto import proto_pb2  # Just an example. pylint: disable=import-error
+
+        @enum.unique
+        class SomeEnum(enum.Enum):
+            # These values should match the protobuf enum values.
+            UNSPECIFIED = 0
+            SOME_VALUE = 1
+
+        enum_value = enum_from_proto(proto_pb2.SomeEnum.SOME_ENUM_SOME_VALUE, SomeEnum)
+        # -> SomeEnum.SOME_VALUE
+
+        enum_value = enum_from_proto(42, SomeEnum)
+        # -> 42
+
+        enum_value = enum_from_proto(
+            proto_pb2.SomeEnum.SOME_ENUM_UNKNOWN_VALUE, SomeEnum, allow_invalid=False
+        )
+        # -> ValueError
+        ```
+
+    Args:
+        value: The protobuf int enum value.
+        enum_type: The python enum type to convert to.
+        allow_invalid: If `True`, return the value as an `int` if the value is not
+            a valid member of the enum (this allows for forward-compatibility with new
+            enum values defined in the protocol but not added to the Python enum yet).
+            If `False`, raise a `ValueError` if the value is not a valid member of the
+            enum.
+
+    Returns:
+        The resulting python enum value if the protobuf value is known, otherwise
+            the input value converted to a plain `int`.
+
+    Raises:
+        ValueError: If `allow_invalid` is `False` and the value is not a valid member
+            of the enum.
+    """
+    try:
+        return enum_type(value)
+    except ValueError:
+        if allow_invalid:
+            return value
+        raise

src/frequenz/client/common/metric/__init__.py

@@ -3,16 +3,18 @@
 
 """Module to define the metrics used with the common client."""
 
-from enum import Enum
+import enum
 from typing import Self
 
 # pylint: disable=no-name-in-module
 from frequenz.api.common.v1.metrics.metric_sample_pb2 import Metric as PBMetric
+from typing_extensions import deprecated
 
 # pylint: enable=no-name-in-module
 
 
-class Metric(Enum):
+@enum.unique
+class Metric(enum.Enum):
     """List of supported metrics.
 
     AC energy metrics information:
@@ -140,6 +142,7 @@ class Metric(Enum):
     SENSOR_IRRADIANCE = PBMetric.METRIC_SENSOR_IRRADIANCE
 
     @classmethod
+    @deprecated("Use `frequenz.client.common.enum_proto.enum_from_proto` instead.")
     def from_proto(cls, metric: PBMetric.ValueType) -> Self:
         """Convert a protobuf Metric value to Metric enum.
 

src/frequenz/client/common/microgrid/__init__.py

@@ -2,3 +2,17 @@
 # Copyright © 2023 Frequenz Energy-as-a-Service GmbH
 
 """Frequenz microgrid definition."""
+
+from typing import final
+
+from frequenz.core.id import BaseId
+
+
+@final
+class EnterpriseId(BaseId, str_prefix="EID"):
+    """A unique identifier for an enterprise account."""
+
+
+@final
+class MicrogridId(BaseId, str_prefix="MID"):
+    """A unique identifier for a microgrid."""

src/frequenz/client/common/microgrid/electrical_components/__init__.py

@@ -2,9 +2,11 @@
 # Copyright © 2022 Frequenz Energy-as-a-Service GmbH
 
 """Defines the electrical components that can be used in a microgrid."""
+
 from __future__ import annotations
 
-from enum import Enum
+import enum
+from typing import final
 
 # pylint: disable=no-name-in-module
 from frequenz.api.common.v1.microgrid.electrical_components.electrical_components_pb2 import (
@@ -16,11 +18,19 @@
 from frequenz.api.common.v1.microgrid.electrical_components.electrical_components_pb2 import (
     ElectricalComponentStateCode as PBElectricalComponentStateCode,
 )
+from frequenz.core.id import BaseId
+from typing_extensions import deprecated
 
 # pylint: enable=no-name-in-module
 
 
-class ElectricalComponentCategory(Enum):
+@final
+class ElectricalComponentId(BaseId, str_prefix="CID"):
+    """A unique identifier for a microgrid electrical component."""
+
+
+@enum.unique
+class ElectricalComponentCategory(enum.Enum):
     """Possible types of microgrid electrical component."""
 
     UNSPECIFIED = (
@@ -67,20 +77,38 @@ class ElectricalComponentCategory(Enum):
     """A relay, used for switching electrical circuits on and off."""
 
     PRECHARGER = PBElectricalComponentCategory.ELECTRICAL_COMPONENT_CATEGORY_PRECHARGER
-    """A precharger, used for preparing electrical circuits for switching on."""
+    """A precharge module.
+
+    Precharging involves gradually ramping up the DC voltage to prevent any
+    potential damage to sensitive electrical components like capacitors.
+
+    While many inverters and batteries come equipped with in-built precharging
+    mechanisms, some may lack this feature. In such cases, we need to use
+    external precharging modules.
+    """
 
     FUSE = PBElectricalComponentCategory.ELECTRICAL_COMPONENT_CATEGORY_FUSE
     """A fuse, used for protecting electrical circuits from overcurrent."""
 
-    TRANSFORMER = (
+    VOLTAGE_TRANSFORMER = (
         PBElectricalComponentCategory.ELECTRICAL_COMPONENT_CATEGORY_VOLTAGE_TRANSFORMER
     )
-    """A transformer, used for changing the voltage of electrical circuits."""
+    """A voltage transformer.
+
+    Voltage transformers are used to step up or step down the voltage, keeping
+    the power somewhat constant by increasing or decreasing the current.  If voltage is
+    stepped up, current is stepped down, and vice versa.
+
+    Note:
+        Voltage transformers have efficiency losses, so the output power is
+        always less than the input power.
+    """
 
     HVAC = PBElectricalComponentCategory.ELECTRICAL_COMPONENT_CATEGORY_HVAC
     """A heating, ventilation, and air conditioning (HVAC) system."""
 
     @classmethod
+    @deprecated("Use `frequenz.client.common.enum_proto.enum_from_proto` instead.")
     def from_proto(
         cls, component_category: PBElectricalComponentCategory.ValueType
     ) -> ElectricalComponentCategory:
@@ -105,7 +133,8 @@ def to_proto(self) -> PBElectricalComponentCategory.ValueType:
         return self.value
 
 
-class ElectricalComponentStateCode(Enum):
+@enum.unique
+class ElectricalComponentStateCode(enum.Enum):
     """All possible states of a microgrid electrical component."""
 
     UNSPECIFIED = (
@@ -207,6 +236,7 @@ class ElectricalComponentStateCode(Enum):
     """The precharger circuit is closed, allowing full current to flow to the main circuit."""
 
     @classmethod
+    @deprecated("Use `frequenz.client.common.enum_proto.enum_from_proto` instead.")
     def from_proto(
         cls, component_state: PBElectricalComponentStateCode.ValueType
     ) -> ElectricalComponentStateCode:
@@ -231,7 +261,8 @@ def to_proto(self) -> PBElectricalComponentStateCode.ValueType:
         return self.value
 
 
-class ElectricalComponentDiagnosticCode(Enum):
+@enum.unique
+class ElectricalComponentDiagnosticCode(enum.Enum):
     """All diagnostics that can occur across electrical component categories."""
 
     UNSPECIFIED = (
@@ -426,6 +457,7 @@ class ElectricalComponentDiagnosticCode(Enum):
     times."""
 
     @classmethod
+    @deprecated("Use `frequenz.client.common.enum_proto.enum_from_proto` instead.")
     def from_proto(
         cls, component_error_code: PBElectricalComponentDiagnosticCode.ValueType
     ) -> ElectricalComponentDiagnosticCode:

src/frequenz/client/common/microgrid/sensors.py

@@ -0,0 +1,13 @@
+# License: MIT
+# Copyright © 2025 Frequenz Energy-as-a-Service GmbH
+
+"""Microgrid sensors."""
+
+from typing import final
+
+from frequenz.core.id import BaseId
+
+
+@final
+class SensorId(BaseId, str_prefix="SID"):
+    """A unique identifier for a microgrid sensor."""

tests/microgrid/test_ids.py

@@ -0,0 +1,28 @@
+# License: MIT
+# Copyright © 2025 Frequenz Energy-as-a-Service GmbH
+
+"""Tests for microgrid-related IDs."""
+
+import pytest
+from frequenz.core.id import BaseId
+
+from frequenz.client.common.microgrid import EnterpriseId, MicrogridId
+from frequenz.client.common.microgrid.electrical_components import ElectricalComponentId
+from frequenz.client.common.microgrid.sensors import SensorId
+
+
+@pytest.mark.parametrize(
+    "id_class, prefix",
+    [
+        (EnterpriseId, "EID"),
+        (MicrogridId, "MID"),
+        (ElectricalComponentId, "CID"),
+        (SensorId, "SID"),
+    ],
+)
+def test_string_representation(id_class: type[BaseId], prefix: str) -> None:
+    """Test string representation of IDs."""
+    _id = id_class(123)
+
+    assert str(_id) == f"{prefix}123"
+    assert repr(_id) == f"{id_class.__name__}(123)"

tests/test_enum_proto.py

@@ -0,0 +1,50 @@
+# License: MIT
+# Copyright © 2025 Frequenz Energy-as-a-Service GmbH
+
+"""Tests for enum_from_proto utility."""
+
+import enum
+
+import pytest
+
+from frequenz.client.common.enum_proto import enum_from_proto
+
+
+class _TestEnum(enum.Enum):
+    """A test enum for enum_from_proto tests."""
+
+    ZERO = 0
+    ONE = 1
+    TWO = 2
+
+
+@pytest.mark.parametrize("enum_member", _TestEnum)
+def test_valid_allow_invalid(enum_member: _TestEnum) -> None:
+    """Test conversion of valid enum values."""
+    assert enum_from_proto(enum_member.value, _TestEnum) == enum_member
+    assert (
+        enum_from_proto(enum_member.value, _TestEnum, allow_invalid=True) == enum_member
+    )
+
+
+@pytest.mark.parametrize("value", [42, -1])
+def test_invalid_allow_invalid(value: int) -> None:
+    """Test unknown values with allow_invalid=True (default)."""
+    assert enum_from_proto(value, _TestEnum) == value
+    assert enum_from_proto(value, _TestEnum, allow_invalid=True) == value
+
+
+@pytest.mark.parametrize("enum_member", _TestEnum)
+def test_valid_disallow_invalid(enum_member: _TestEnum) -> None:
+    """Test unknown values with allow_invalid=False (should raise ValueError)."""
+    assert (
+        enum_from_proto(enum_member.value, _TestEnum, allow_invalid=False)
+        == enum_member
+    )
+
+
+@pytest.mark.parametrize("value", [42, -1])
+def test_invalid_disallow(value: int) -> None:
+    """Test unknown values with allow_invalid=False (should raise ValueError)."""
+    with pytest.raises(ValueError, match=rf"^{value} is not a valid _TestEnum$"):
+        enum_from_proto(value, _TestEnum, allow_invalid=False)