add special dsl.OutputPath read logic

sdk/python/kfp/local/executor_output_utils.py

@@ -99,18 +99,33 @@ def get_outputs_from_executor_output(
     return {**output_parameters, **output_artifacts}
 
 
-def special_dsl_outputpath_read(output_file: str, is_string: bool) -> Any:
+def special_dsl_outputpath_read(
+    parameter_name: str,
+    output_file: str,
+    dtype: pipeline_spec_pb2.ParameterType.ParameterTypeEnum,
+) -> Any:
     """Reads the text in dsl.OutputPath files in the same way as the remote
     backend.
 
-    Basically deserialize all types as JSON, but also support strings
-    that are written directly without quotes (e.g., `foo` instead of
-    `"foo"`).
+    In brief: read strings as strings, permit both "Python" and JSON
+    bool (True/true), and treat everything else as JSON.
     """
-    with open(output_file) as f:
-        parameter_value = f.read()
-    # TODO: verify this is the correct special handling of OutputPath
-    return parameter_value if is_string else json.loads(parameter_value)
+    try:
+        with open(output_file) as f:
+            value = f.read().strip()
+
+        if dtype == pipeline_spec_pb2.ParameterType.ParameterTypeEnum.STRING:
+            value = value
+        elif dtype == pipeline_spec_pb2.ParameterType.ParameterTypeEnum.BOOLEAN:
+            # permit true/True and false/False, consistent with remote BE
+            value = json.loads(value.lower())
+        else:
+            value = json.loads(value)
+        return value
+    except Exception as e:
+        raise ValueError(
+            f'Could not deserialize output {parameter_name!r} from path {output_file}'
+        ) from e
 
 
 def merge_dsl_output_file_parameters_to_executor_output(
@@ -123,11 +138,11 @@ def merge_dsl_output_file_parameters_to_executor_output(
     for parameter_key, output_parameter in executor_input.outputs.parameters.items(
     ):
         if os.path.exists(output_parameter.output_file):
-            is_string = component_spec.output_definitions.parameters[
-                parameter_key].parameter_type == pipeline_spec_pb2.ParameterType.ParameterTypeEnum.STRING
             parameter_value = special_dsl_outputpath_read(
-                output_parameter.output_file,
-                is_string,
+                parameter_name=parameter_key,
+                output_file=output_parameter.output_file,
+                dtype=component_spec.output_definitions
+                .parameters[parameter_key].parameter_type,
             )
             executor_output.parameter_values[parameter_key].CopyFrom(
                 pipeline_spec_builder.to_protobuf_value(parameter_value))

sdk/python/kfp/local/executor_output_utils_test.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 """Tests for executor_output_utils.py."""
 
+import json
 import os
 import tempfile
 from typing import List
@@ -580,19 +581,59 @@ def test(self):
 
 class TestSpecialDslOutputPathRead(parameterized.TestCase):
 
-    @parameterized.parameters([('foo', 'foo', True)])
-    def test(self, written_string, expected_object, is_string):
+    @parameterized.parameters([
+        ('foo', 'foo',
+         pipeline_spec_pb2.ParameterType.ParameterTypeEnum.STRING),
+        ('foo ', 'foo',
+         pipeline_spec_pb2.ParameterType.ParameterTypeEnum.STRING),
+        ('foo\n', 'foo',
+         pipeline_spec_pb2.ParameterType.ParameterTypeEnum.STRING),
+        ('true', True,
+         pipeline_spec_pb2.ParameterType.ParameterTypeEnum.BOOLEAN),
+        ('True', True,
+         pipeline_spec_pb2.ParameterType.ParameterTypeEnum.BOOLEAN),
+        ('false', False,
+         pipeline_spec_pb2.ParameterType.ParameterTypeEnum.BOOLEAN),
+        ('False', False,
+         pipeline_spec_pb2.ParameterType.ParameterTypeEnum.BOOLEAN),
+        ('False\n', False,
+         pipeline_spec_pb2.ParameterType.ParameterTypeEnum.BOOLEAN),
+        (json.dumps({'x': 'y'}), {
+            'x': 'y'
+        }, pipeline_spec_pb2.ParameterType.ParameterTypeEnum.STRUCT),
+        ('3.14', 3.14,
+         pipeline_spec_pb2.ParameterType.ParameterTypeEnum.NUMBER_DOUBLE),
+        ('100', 100,
+         pipeline_spec_pb2.ParameterType.ParameterTypeEnum.NUMBER_INTEGER),
+    ])
+    def test(self, written, expected, dtype):
         with tempfile.TemporaryDirectory() as tempdir:
             output_file = os.path.join(tempdir, 'Output')
             with open(output_file, 'w') as f:
-                f.write(written_string)
+                f.write(written)
 
             actual = executor_output_utils.special_dsl_outputpath_read(
-                output_file,
-                is_string=is_string,
+                parameter_name='name',
+                output_file=output_file,
+                dtype=dtype,
             )
 
-        self.assertEqual(actual, expected_object)
+        self.assertEqual(actual, expected)
+
+    def test_exception(self):
+        with tempfile.TemporaryDirectory() as tempdir:
+            output_file = os.path.join(tempdir, 'Output')
+            with open(output_file, 'w') as f:
+                f.write(str({'x': 'y'}))
+            with self.assertRaisesRegex(
+                    ValueError,
+                    r"Could not deserialize output 'name' from path"):
+                executor_output_utils.special_dsl_outputpath_read(
+                    parameter_name='name',
+                    output_file=output_file,
+                    dtype=pipeline_spec_pb2.ParameterType.ParameterTypeEnum
+                    .STRUCT,
+                )
 
 
 def assert_artifacts_equal(