Address PR comments: Improve code quality and add validation

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/knowledge/storage/knowledge_storage.py

@@ -83,6 +83,11 @@ class KnowledgeStorage(BaseKnowledgeStorage):
                 raise Exception("Collection not initialized")
 
     def initialize_knowledge_storage(self):
+        """Initialize the knowledge storage with ChromaDB.
+        
+        Handles SQLite3 version incompatibility gracefully by logging a warning
+        and continuing without ChromaDB functionality.
+        """
         try:
             base_path = os.path.join(db_storage_path(), "knowledge")
             chroma_client = chromadb.PersistentClient(
@@ -91,29 +96,29 @@ class KnowledgeStorage(BaseKnowledgeStorage):
             )
 
             self.app = chroma_client
-
-            try:
-                collection_name = (
-                    f"knowledge_{self.collection_name}"
-                    if self.collection_name
-                    else "knowledge"
-                )
-                if self.app:
-                    self.collection = self.app.get_or_create_collection(
-                        name=collection_name, embedding_function=self.embedder
-                    )
-                else:
-                    raise Exception("Vector Database Client not initialized")
-            except Exception:
-                raise Exception("Failed to create or get collection")
+            
+            collection_name = (
+                f"knowledge_{self.collection_name}"
+                if self.collection_name
+                else "knowledge"
+            )
+            
+            if not self.app:
+                raise Exception("Vector Database Client not initialized")
+                
+            self.collection = self.app.get_or_create_collection(
+                name=collection_name, embedding_function=self.embedder
+            )
         except RuntimeError as e:
             if "unsupported version of sqlite3" in str(e).lower():
                 # Log a warning but continue without ChromaDB
-                logging.warning(f"ChromaDB requires SQLite3 >= 3.35.0. Current version is too old. Some features may be limited. Error: {e}")
+                logging.warning("ChromaDB requires SQLite3 >= 3.35.0. Current version is too old. Some features may be limited. Error: %s", e)
                 self.app = None
                 self.collection = None
             else:
                 raise
+        except Exception as e:
+            raise Exception(f"Failed to create or get collection: {e}")
 
     def reset(self):
         base_path = os.path.join(db_storage_path(), KNOWLEDGE_DIRECTORY)

src/crewai/memory/storage/rag_storage.py

@@ -4,15 +4,19 @@ import logging
 import os
 import shutil
 import uuid
-from typing import Any, Dict, List, Optional
+from typing import Any, Dict, List, Optional, Union, Collection
 
 from chromadb.api import ClientAPI
+from chromadb.api.models.Collection import Collection
 
 from crewai.memory.storage.base_rag_storage import BaseRAGStorage
 from crewai.utilities import EmbeddingConfigurator
 from crewai.utilities.constants import MAX_FILE_NAME_LENGTH
 from crewai.utilities.paths import db_storage_path
 
+# Constants
+SQLITE_VERSION_ERROR = "ChromaDB requires SQLite3 >= 3.35.0. Current version is too old. Some features may be limited. Error: {}"
+
 
 @contextlib.contextmanager
 def suppress_logging(
@@ -89,7 +93,7 @@ class RAGStorage(BaseRAGStorage):
         except RuntimeError as e:
             if "unsupported version of sqlite3" in str(e).lower():
                 # Log a warning but continue without ChromaDB
-                logging.warning(f"ChromaDB requires SQLite3 >= 3.35.0. Current version is too old. Some features may be limited. Error: {e}")
+                logging.warning(SQLITE_VERSION_ERROR.format(e))
                 self.app = None
                 self.collection = None
             else:

src/crewai/utilities/embedding_configurator.py

@@ -40,16 +40,45 @@ class EmbeddingConfigurator:
             "custom": self._configure_custom,
         }
 
+    def _validate_config(self, config: Dict[str, Any]) -> bool:
+        """Validates that the configuration contains the required keys.
+        
+        Args:
+            config: The configuration dictionary to validate
+            
+        Returns:
+            bool: True if the configuration is valid, False otherwise
+        """
+        if not config:
+            return False
+            
+        required_keys = {'provider'}
+        return all(key in config for key in required_keys)
+        
     def configure_embedder(
         self,
         embedder_config: Optional[Dict[str, Any]] = None,
     ) -> Optional[EmbeddingFunction]:
-        """Configures and returns an embedding function based on the provided config."""
+        """Configures and returns an embedding function based on the provided config.
+        
+        Args:
+            embedder_config: Configuration dictionary for the embedder
+            
+        Returns:
+            Optional[EmbeddingFunction]: The configured embedding function or None if ChromaDB is not available
+            
+        Raises:
+            ValueError: If the configuration is invalid
+            Exception: If the provider is not supported
+        """
         if not CHROMADB_AVAILABLE:
             return None
             
         if embedder_config is None:
             return self._create_default_embedding_function()
+            
+        if not self._validate_config(embedder_config):
+            raise ValueError("Invalid embedder configuration: missing required keys")
 
         provider = embedder_config.get("provider")
         config = embedder_config.get("config", {})

tests/utilities/test_embedding_configurator.py

@@ -31,3 +31,22 @@ class TestEmbeddingConfigurator(unittest.TestCase):
         
         # Verify that configure_embedder returns the mock embedding function
         self.assertEqual(configurator.configure_embedder(), "mock_embedding_function")
+        
+    @patch('crewai.utilities.embedding_configurator.CHROMADB_AVAILABLE', True)
+    def test_embedding_configurator_with_invalid_config(self):
+        from crewai.utilities.embedding_configurator import EmbeddingConfigurator
+        
+        # Create an instance of EmbeddingConfigurator
+        configurator = EmbeddingConfigurator()
+        
+        # Test with empty config
+        with self.assertRaises(ValueError):
+            configurator.configure_embedder({})
+            
+        # Test with missing required keys
+        with self.assertRaises(ValueError):
+            configurator.configure_embedder({"config": {}})
+            
+        # Test with unsupported provider
+        with self.assertRaises(Exception):
+            configurator.configure_embedder({"provider": "unsupported_provider", "config": {}})