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function init_chat_engine_v1

Maturity: 42

Initializes a global chat engine instance using OneCo_hybrid_RAG and validates its configuration by checking for required attributes like available_collections and data_handles.

File:
/tf/active/vicechatdev/vice_ai/app.py
Lines:
245 - 268
Complexity:
moderate

Purpose

This function serves as an initialization routine for a chat application's RAG (Retrieval-Augmented Generation) engine. It creates a global chat_engine instance, performs validation checks on the engine's attributes, and logs diagnostic information about available collections and data handles. The function is designed to be called during application startup to ensure the chat engine is properly configured before handling user requests.

Source Code

def init_chat_engine():
    """Initialize the chat engine"""
    global chat_engine
    try:
        chat_engine = OneCo_hybrid_RAG()
        logger.info("Chat engine initialized successfully")
        
        # Log available collections for debugging
        if hasattr(chat_engine, 'available_collections'):
            collections = getattr(chat_engine, 'available_collections', [])
            logger.info(f"Available collections: {collections} (count: {len(collections)})")
        else:
            logger.warning("Chat engine does not have available_collections attribute")
            
        # Check for data_handles
        if hasattr(chat_engine, 'data_handles'):
            logger.info("Chat engine has data_handles attribute")
        else:
            logger.warning("Chat engine does not have data_handles attribute")
            
        return True
    except Exception as e:
        logger.error(f"Failed to initialize chat engine: {e}")
        return False

Return Value

Returns a boolean value: True if the chat engine was successfully initialized and the global variable was set, False if an exception occurred during initialization. The function also sets the global 'chat_engine' variable as a side effect.

Dependencies

  • logging
  • hybrid_rag_engine

Required Imports

import logging
from hybrid_rag_engine import OneCo_hybrid_RAG

Usage Example

import logging
from hybrid_rag_engine import OneCo_hybrid_RAG

# Setup logger
logger = logging.getLogger(__name__)
logging.basicConfig(level=logging.INFO)

# Declare global variable
chat_engine = None

# Initialize the chat engine
if init_chat_engine():
    print("Chat engine ready")
    # Use chat_engine for queries
    # response = chat_engine.query("What is...")
else:
    print("Failed to initialize chat engine")

Best Practices

  • This function modifies global state (chat_engine variable), so it should only be called once during application initialization
  • Ensure the logger is configured before calling this function to capture initialization logs
  • The function uses hasattr() and getattr() for defensive attribute checking, which is good practice when working with dynamically configured objects
  • Consider using a thread lock if this function might be called from multiple threads simultaneously
  • The function returns a boolean for success/failure, but also logs errors - ensure error handling at the call site checks both the return value and logs
  • The global chat_engine variable should be declared before calling this function to avoid NameError

Tags

initialization chat-engine RAG hybrid-rag setup global-state validation logging error-handling

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