Add descriptive error

opentelemetry-sdk/src/opentelemetry/sdk/_configuration/__init__.py

@@ -94,18 +94,31 @@ def _import_config_components(
     component_implementations = []
 
     for selected_component in selected_components:
-        component_implementations.append(
-            (
-                selected_component,
-                next(
-                    iter(
-                        entry_points(
-                            group=entry_point_name, name=selected_component
+        try:
+            component_implementations.append(
+                (
+                    selected_component,
+                    next(
+                        iter(
+                            entry_points(
+                                group=entry_point_name, name=selected_component
+                            )
                         )
-                    )
-                ).load(),
+                    ).load(),
+                )
+            )
+        except KeyError:
+
+            raise RuntimeError(
+                f"Requested entry point '{entry_point_name}' not found"
+            )
+
+        except StopIteration:
+
+            raise RuntimeError(
+                f"Requested component '{selected_component}' not found in "
+                f"entry point '{entry_point_name}'"
             )
-        )
 
     return component_implementations
 

opentelemetry-sdk/tests/test_configurator.py

@@ -20,6 +20,8 @@
 from unittest import TestCase
 from unittest.mock import patch
 
+from pytest import raises
+
 from opentelemetry import trace
 from opentelemetry.context import Context
 from opentelemetry.environment_variables import OTEL_PYTHON_ID_GENERATOR
@@ -30,6 +32,7 @@
     _get_exporter_names,
     _get_id_generator,
     _get_sampler,
+    _import_config_components,
     _import_exporters,
     _import_id_generator,
     _import_sampler,
@@ -780,3 +783,34 @@ def test_console_exporters(self):
             metric_exporterts["console"].__class__,
             ConsoleMetricExporter.__class__,
         )
+
+
+class TestImportConfigComponents(TestCase):
+    @patch(
+        "opentelemetry.sdk._configuration.entry_points",
+        **{"side_effect": KeyError},
+    )
+    def test__import_config_components_missing_entry_point(
+        self, mock_entry_points
+    ):
+
+        with raises(RuntimeError) as error:
+            _import_config_components(["a", "b", "c"], "name")
+        self.assertEqual(
+            str(error.value), "Requested entry point 'name' not found"
+        )
+
+    @patch(
+        "opentelemetry.sdk._configuration.entry_points",
+        **{"side_effect": StopIteration},
+    )
+    def test__import_config_components_missing_component(
+        self, mock_entry_points
+    ):
+
+        with raises(RuntimeError) as error:
+            _import_config_components(["a", "b", "c"], "name")
+        self.assertEqual(
+            str(error.value),
+            "Requested component 'a' not found in entry point 'name'",
+        )