Add a capi conversion no-op method to thrift python structs/unions

Summary: There's a generated python capi method on thrift-py3 structs to initialize from thrift python types. It's a very simple fix to add a no-op method to the base thrift python StructOrUnion class to get these unit tests to start passing now. Since the method is meant to initialize a thrift python struct with a thrift python struct, all that we need to do is return the passed in object (after a basic instance check to make sure no python shenanigans are going on).

Reviewed By: ahilger

Differential Revision: D68867840

fbshipit-source-id: 817381af3586cf7586532c6f94af676cfc16b241

thrift/lib/py3/test/auto_migrate/converter.py

@@ -309,7 +309,6 @@ class Evil(Enum):
             evil_cls.__module__, "thrift.lib.py3.test.auto_migrate.converter"
         )
 
-    @brokenInAutoMigrate()
     def test_simple_capi(self) -> None:
         self.assert_simple(py3_types.Simple.from_python(self.make_simple_python()))
 
@@ -358,7 +357,6 @@ def test_nested(self) -> None:
             nested.colorToSimpleMap[py3_types.Color.BLUE].color, py3_types.Color.BLUE
         )
 
-    @brokenInAutoMigrate()
     def test_nested_capi(self) -> None:
         self.assertEqual(
             self.make_nested_python()._to_py3(),
@@ -370,7 +368,6 @@ def test_simple_union(self) -> None:
         self.assertEqual(simple_union.type, py3_types.Union.Type.intField)
         self.assertEqual(simple_union.value, 42)
 
-    @brokenInAutoMigrate()
     def test_simple_union_capi(self) -> None:
         simple_union = py3_types.Union.from_python(python_types.Union(intField=42))
         self.assertEqual(simple_union.type, py3_types.Union.Type.intField)
@@ -381,7 +378,6 @@ def test_union_with_py3_name_annotation(self) -> None:
         self.assertEqual(simple_union.type, py3_types.Union.Type.name_)
         self.assertEqual(simple_union.value, "myname")
 
-    @brokenInAutoMigrate()
     def test_union_with_py3_name_annotation_capi(self) -> None:
         simple_union = py3_types.Union.from_python(python_types.Union(name_="myname"))
         self.assertEqual(simple_union.type, py3_types.Union.Type.name_)
@@ -392,7 +388,6 @@ def test_union_with_containers(self) -> None:
         self.assertEqual(union_with_list.type, py3_types.Union.Type.intList)
         self.assertEqual(union_with_list.value, [1, 2, 3])
 
-    @brokenInAutoMigrate()
     def test_union_with_containers_capi(self) -> None:
         union_with_list = py3_types.Union.from_python(
             python_types.Union(intList=[1, 2, 3])
@@ -407,7 +402,6 @@ def test_complex_union(self) -> None:
         self.assertEqual(complex_union.type, py3_types.Union.Type.simple_)
         self.assertEqual(complex_union.simple_.intField, 42)
 
-    @brokenInAutoMigrate()
     def test_complex_union_capi(self) -> None:
         complex_union = py3_types.Union.from_python(
             python_types.Union(

thrift/lib/python/exceptions.pyx

@@ -310,6 +310,13 @@ cdef class GeneratedError(Error):
             )
         self._fbthrift_populate_field_values()
 
+    @staticmethod
+    def from_python(obj: GeneratedError) -> GeneratedError:
+        if not isinstance(obj, GeneratedError):
+            raise TypeError(f'value {obj} expected to be a thrift-python Exception, was actually of type ' f'{type(obj)}')
+        return obj
+
+
     @classmethod
     def _fbthrift_auto_migrate_enabled(cls):
         return False

thrift/lib/python/types.pyx

@@ -1011,6 +1011,12 @@ cdef class StructOrUnion:
     cdef _fbthrift_get_field_value(self, int16_t index):
         raise NotImplementedError("Not implemented on base StructOrUnion class")
 
+    @staticmethod
+    def from_python(obj: StructOrUnion) -> StructOrUnion:
+        if not isinstance(obj, StructOrUnion):
+            raise TypeError(f'value {obj} expected to be a thrift-python Struct or Union, was actually of type ' f'{type(obj)}')
+        return obj
+
     @classmethod
     def _fbthrift_auto_migrate_enabled(cls):
         return False