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Flask route handler that renders the main chat interface with available collections and instruction templates, requiring authentication.

Purpose

This function serves as the main entry point for the chat interface in a Flask web application. It validates that the chat engine is available, retrieves configuration options including available document collections and instruction templates, logs diagnostic information about templates, and renders the chat.html template with user session data and configuration options. It acts as a gateway ensuring users are authenticated and the chat system is properly initialized before allowing access to the chat interface.

Source Code

def chat():
    """Main chat interface"""
    if not chat_engine:
        flash('Chat engine not available', 'error')
        return redirect(url_for('index'))
    
    # Get available collections and configuration options
    collections = getattr(chat_engine, 'available_collections', [])
    instruction_templates = list(getattr(chat_engine, 'instruction_templates', {}).keys())
    
    logger.info(f"📋 Available instruction templates: {instruction_templates}")
    logger.info(f"🔍 Chat engine instruction_templates attribute check: {hasattr(chat_engine, 'instruction_templates')}")
    if hasattr(chat_engine, 'instruction_templates'):
        templates_dict = getattr(chat_engine, 'instruction_templates', {})
        logger.info(f"📊 Templates dictionary keys: {list(templates_dict.keys())}")
        for template_name in list(templates_dict.keys())[:3]:  # Log first 3 template previews
            template_content = templates_dict.get(template_name, '')
            logger.info(f"📄 Template '{template_name}': {len(template_content)} chars - '{template_content[:100]}...'")
    
    return render_template('chat.html', 
                         user=session['user'],
                         collections=collections,
                         instruction_templates=instruction_templates)

Return Value

Returns a Flask Response object. On success, returns the rendered 'chat.html' template with context variables (user, collections, instruction_templates). On failure (when chat_engine is not available), flashes an error message and returns a redirect Response to the 'index' route.

Dependencies

• flask
• logging
• hybrid_rag_engine
• auth.azure_auth
• document_processor
• werkzeug

Required Imports

from flask import Flask, render_template, request, jsonify, session, redirect, url_for, flash
import logging

Conditional/Optional Imports

These imports are only needed under specific conditions:

from hybrid_rag_engine import OneCo_hybrid_RAG

from auth.azure_auth import AzureSSO

Usage Example

# Module-level setup required before this function works
from flask import Flask, session
import logging
from hybrid_rag_engine import OneCo_hybrid_RAG

app = Flask(__name__)
app.secret_key = 'your-secret-key'
logger = logging.getLogger(__name__)

# Initialize chat engine
chat_engine = OneCo_hybrid_RAG()

# Define require_auth decorator
def require_auth(f):
    def wrapper(*args, **kwargs):
        if 'user' not in session:
            return redirect(url_for('login'))
        return f(*args, **kwargs)
    wrapper.__name__ = f.__name__
    return wrapper

# Register the route
@app.route('/chat')
@require_auth
def chat():
    if not chat_engine:
        flash('Chat engine not available', 'error')
        return redirect(url_for('index'))
    
    collections = getattr(chat_engine, 'available_collections', [])
    instruction_templates = list(getattr(chat_engine, 'instruction_templates', {}).keys())
    
    return render_template('chat.html', 
                         user=session['user'],
                         collections=collections,
                         instruction_templates=instruction_templates)

# Run the app
if __name__ == '__main__':
    app.run(debug=True)

Best Practices

• Ensure chat_engine is properly initialized before the Flask app starts accepting requests
• The require_auth decorator must be applied to protect this route from unauthorized access
• Session management must be properly configured with a secure SECRET_KEY
• The chat_engine should implement available_collections and instruction_templates attributes as expected
• Error handling redirects users gracefully when chat_engine is unavailable
• Extensive logging is used for debugging template availability - consider reducing log verbosity in production
• The function uses getattr with default values to safely access potentially missing attributes
• Template 'chat.html' must be designed to accept user, collections, and instruction_templates context variables
• Consider implementing proper error pages instead of just flashing messages and redirecting
• The global chat_engine variable pattern may cause issues in multi-threaded environments - consider using application context or dependency injection

Tags

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