Improve error messaging for comparisons involving entrypoints (#2276)

Make error messaging more specific for cases where entrypoint` 
names must match other names (e.g. catalog types schema_names 
and runtime schema file names)

elyra/metadata/schemasproviders.py

@@ -21,6 +21,7 @@
 from typing import List
 
 import entrypoints
+from traitlets import log  # noqa H306
 try:
     from kfp_tekton import TektonClient
 except ImportError:
@@ -48,6 +49,7 @@ class ElyraSchemasProvider(SchemasProvider, metaclass=ABCMeta):
             local_schemas.append(schema_json)
 
     def __init__(self):
+        self.log = log.get_logger()
         # get set of registered runtimes
         self._runtime_processor_names = set()
         for processor in entrypoints.get_group_all('elyra.pipeline.processors'):
@@ -79,6 +81,9 @@ def get_schemas(self) -> List[Dict]:
                 runtime_schemas.append(schema)
                 if schema['name'] == 'kfp':
                     kfp_needed = True
+            else:
+                self.log.error(f"No entrypoint with name '{schema['name']}' was found in group "
+                               f"'elyra.pipeline.processor' to match the schema with the same name. Skipping...")
 
         if kfp_needed:  # Update the kfp engine enum to reflect current packages...
             # If TektonClient package is missing, navigate to the engine property

elyra/pipeline/catalog_connector.py

@@ -246,7 +246,7 @@ def read_component_definitions(self, catalog_instance: Metadata) -> Dict[str, Di
 
         except NotImplementedError as e:
             err_msg = f"{self.__class__.__name__} does not meet the requirements of a catalog connector class: {e}"
-            self.log.warning(err_msg)
+            self.log.error(err_msg)
         except Exception as e:
             err_msg = f"Could not get catalog entry information for catalog '{catalog_instance.display_name}': {e}"
             # Dump stack trace with error message
@@ -290,7 +290,7 @@ def read_with_thread():
 
                 except NotImplementedError as e:
                     msg = f"{self.__class__.__name__} does not meet the requirements of a catalog connector class: {e}."
-                    self.log.warning(msg)
+                    self.log.error(msg)
                 except Exception as e:
                     # Dump stack trace with error message and continue
                     self.log.exception(f"Could not read definition for catalog entry with identifying information: "

elyra/pipeline/component_registry.py

@@ -240,11 +240,15 @@ def _read_component_catalogs(self, catalogs: Optional[List[Metadata]] = None) ->
         for catalog in catalogs:
             # Assign reader based on the type of the catalog (the 'schema_name')
             try:
-                catalog_reader = entrypoints.get_group_named('elyra.component.catalog_types')\
-                    .get(catalog.schema_name)\
-                    .load()(self._parser.file_types, parent=self.parent)
+                catalog_reader = entrypoints.get_group_named('elyra.component.catalog_types').get(catalog.schema_name)
+                if not catalog_reader:
+                    self.log.error(f"No entrypoint with name '{catalog.schema_name}' was found in group "
+                                   f"'elyra.component.catalog_types' to match the 'schema_name' given in catalog "
+                                   f"'{catalog.display_name}'. Skipping...")
+                    continue
+                catalog_reader = catalog_reader.load()(self._parser.file_types, parent=self.parent)
             except Exception as e:
-                self.log.warning(f"Could not load appropriate ComponentCatalogConnector class: {e}. Skipping...")
+                self.log.error(f"Could not load appropriate ComponentCatalogConnector class: {e}. Skipping...")
                 continue
 
             # Get content of component definition file for each component in this catalog