logger.py

"""
Logging configuration for the RAG Chatbot.
Provides consistent logging across all modules.
"""
import logging
import os
from logging.handlers import RotatingFileHandler

def setup_logger(name='rag_chatbot', log_file='app.log', log_level='INFO'):
    """
    Set up application logger with file and console handlers.
    
    Args:
        name: Logger name
        log_file: Path to log file
        log_level: Logging level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
    
    Returns:
        Configured logger instance
    """
    # Create logger
    logger = logging.getLogger(name)
    logger.setLevel(getattr(logging, log_level.upper(), logging.INFO))
    
    # Prevent duplicate handlers
    if logger.handlers:
        return logger
    
    # Create formatters
    detailed_formatter = logging.Formatter(
        '%(asctime)s - %(name)s - %(levelname)s - %(filename)s:%(lineno)d - %(message)s',
        datefmt='%Y-%m-%d %H:%M:%S'
    )
    
    simple_formatter = logging.Formatter(
        '%(asctime)s - %(levelname)s - %(message)s',
        datefmt='%H:%M:%S'
    )
    
    # File handler with rotation
    file_handler = RotatingFileHandler(
        log_file,
        maxBytes=10 * 1024 * 1024,  # 10MB
        backupCount=5
    )
    file_handler.setLevel(logging.DEBUG)
    file_handler.setFormatter(detailed_formatter)
    
    # Console handler
    console_handler = logging.StreamHandler()
    console_handler.setLevel(logging.INFO)
    console_handler.setFormatter(simple_formatter)
    
    # Add handlers to logger
    logger.addHandler(file_handler)
    logger.addHandler(console_handler)
    
    return logger

# Initialize default logger
logger = setup_logger()