Add scalar.proto, generate stubs, implement converter, and add unit tests.

protos/ni/protobuf/types/scalar.proto

@@ -0,0 +1,23 @@
+syntax = "proto3";
+
+package ni.protobuf.types;
+
+option csharp_namespace = "NationalInstruments.Protobuf.Types";
+option go_package = "types";
+option java_multiple_files = true;
+option java_outer_classname = "ScalarProto";
+option java_package = "com.ni.protobuf.types";
+option objc_class_prefix = "NIPT";
+option php_namespace = "NI\\PROTOBUF\\TYPES";
+option ruby_package = "NI::Protobuf::Types";
+
+message ScalarData {
+ string units = 1;
+
+  oneof value {
+    double double_value = 2;
+    int32 int32_value = 3;
+    bool bool_value = 4;
+    string string_value = 5;
+  }
+}

pyproject.toml

@@ -13,6 +13,8 @@ protobuf = {version=">=4.21"}
 ni-measurement-plugin-sdk = {version=">=2.3"}
 typing-extensions = ">=4.13.2"
 streamlit = ">=1.24"
+# Temporary dependency until ni-apis-python is available.
+nitypes = ">=0.1.0dev1"
 
 [tool.poetry.group.dev.dependencies]
 types-grpcio = ">=1.0"
@@ -52,10 +54,10 @@ requires = ["poetry-core>=1.8.0"]
 build-backend = "poetry.core.masonry.api"
 
 [tool.ni-python-styleguide]
-extend_exclude = ".tox,docs,src/ni/pythonpanel/v1"
+extend_exclude = ".tox,docs,src/ni/pythonpanel/v1,src/ni/protobuf/types/"
 
 [tool.black]
-extend-exclude = '\.tox/|docs/|src/ni/pythonpanel/v1/'
+extend-exclude = '\.tox/|docs/|src/ni/pythonpanel/v1/|src/ni/protobuf/types/'
 line-length = 100
 
 [tool.mypy]

src/ni/protobuf/types/scalar_pb2.pyi

@@ -0,0 +1,40 @@
+"""
+@generated by mypy-protobuf.  Do not edit manually!
+isort:skip_file
+"""
+
+import builtins
+import google.protobuf.descriptor
+import google.protobuf.message
+import typing
+
+DESCRIPTOR: google.protobuf.descriptor.FileDescriptor
+
+@typing.final
+class ScalarData(google.protobuf.message.Message):
+    DESCRIPTOR: google.protobuf.descriptor.Descriptor
+
+    UNITS_FIELD_NUMBER: builtins.int
+    DOUBLE_VALUE_FIELD_NUMBER: builtins.int
+    INT32_VALUE_FIELD_NUMBER: builtins.int
+    BOOL_VALUE_FIELD_NUMBER: builtins.int
+    STRING_VALUE_FIELD_NUMBER: builtins.int
+    units: builtins.str
+    double_value: builtins.float
+    int32_value: builtins.int
+    bool_value: builtins.bool
+    string_value: builtins.str
+    def __init__(
+        self,
+        *,
+        units: builtins.str = ...,
+        double_value: builtins.float = ...,
+        int32_value: builtins.int = ...,
+        bool_value: builtins.bool = ...,
+        string_value: builtins.str = ...,
+    ) -> None: ...
+    def HasField(self, field_name: typing.Literal["bool_value", b"bool_value", "double_value", b"double_value", "int32_value", b"int32_value", "string_value", b"string_value", "value", b"value"]) -> builtins.bool: ...
+    def ClearField(self, field_name: typing.Literal["bool_value", b"bool_value", "double_value", b"double_value", "int32_value", b"int32_value", "string_value", b"string_value", "units", b"units", "value", b"value"]) -> None: ...
+    def WhichOneof(self, oneof_group: typing.Literal["value", b"value"]) -> typing.Literal["double_value", "int32_value", "bool_value", "string_value"] | None: ...
+
+global___ScalarData = ScalarData

src/ni/protobuf/types/scalar_pb2_grpc.py

@@ -0,0 +1,4 @@
+# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!
+"""Client and server classes corresponding to protobuf-defined services."""
+import grpc
+

src/ni/protobuf/types/scalar_pb2_grpc.pyi

@@ -0,0 +1,17 @@
+"""
+@generated by mypy-protobuf.  Do not edit manually!
+isort:skip_file
+"""
+
+import abc
+import collections.abc
+import grpc
+import grpc.aio
+import typing
+
+_T = typing.TypeVar("_T")
+
+class _MaybeAsyncIterator(collections.abc.AsyncIterator[_T], collections.abc.Iterator[_T], metaclass=abc.ABCMeta): ...
+
+class _ServicerContext(grpc.ServicerContext, grpc.aio.ServicerContext):  # type: ignore[misc, type-arg]
+    ...

src/nipanel/converters/protobuf_types.py

@@ -0,0 +1,56 @@
+"""Classes to convert between measurement specific protobuf types and containers."""
+
+from typing import Any, Type
+
+from ni.protobuf.types import scalar_pb2
+from nitypes.scalar import Scalar
+
+from nipanel.converters import Converter
+
+
+class ScalarConverter(Converter[Scalar[Any], scalar_pb2.ScalarData]):
+    """A converter for Scalar objects."""
+
+    @property
+    def python_typename(self) -> str:
+        """The Python type that this converter handles."""
+        return Scalar.__name__
+
+    @property
+    def protobuf_message(self) -> Type[scalar_pb2.ScalarData]:
+        """The type-specific protobuf message for the Python type."""
+        return scalar_pb2.ScalarData
+
+    def to_protobuf_message(self, python_value: Scalar[Any]) -> scalar_pb2.ScalarData:
+        """Convert the Python Scalar to a protobuf scalar_pb2.ScalarData."""
+        message = self.protobuf_message()
+        message.units = python_value.units
+        if isinstance(python_value.value, bool):
+            message.bool_value = python_value.value
+        elif isinstance(python_value.value, int):
+            message.int32_value = python_value.value
+        elif isinstance(python_value.value, float):
+            message.double_value = python_value.value
+        elif isinstance(python_value.value, str):
+            message.string_value = python_value.value
+        else:
+            raise TypeError(f"Unexpected type for python_value.value: {type(python_value.value)}")
+
+        return message
+
+    def to_python_value(self, protobuf_value: scalar_pb2.ScalarData) -> Scalar[Any]:
+        """Convert the protobuf message to a Python Scalar."""
+        if protobuf_value.units is None:
+            raise ValueError("protobuf.units cannot be None.")
+
+        pb_type = protobuf_value.WhichOneof("value")
+        if pb_type == "bool_value":
+            return Scalar(protobuf_value.bool_value, protobuf_value.units)
+        elif pb_type == "int32_value":
+            return Scalar(protobuf_value.int32_value, protobuf_value.units)
+        elif pb_type == "double_value":
+            return Scalar(protobuf_value.double_value, protobuf_value.units)
+        elif pb_type == "string_value":
+            return Scalar(protobuf_value.string_value, protobuf_value.units)
+        else:
+            raise ValueError(f"Unexpected value for protobuf_value.WhichOneOf: {pb_type}")