logger_setup.py

import logging
import os
from logging.handlers import RotatingFileHandler
from config import LOG_DIR

os.makedirs(LOG_DIR, exist_ok=True)

def get_logger(name: str) -> logging.Logger:
    """Return a named logger that writes to both console and a rotating file."""
    logger = logging.getLogger(name)
    if logger.handlers:
        return logger

    logger.setLevel(logging.DEBUG)
    fmt = logging.Formatter(
        "%(asctime)s  %(levelname)-8s  [%(name)s]  %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )

    # Console handler
    ch = logging.StreamHandler()
    ch.setLevel(logging.INFO)
    ch.setFormatter(fmt)

    # Rotating file handler (10 MB per file, keep 5 backups)
    log_path = os.path.join(LOG_DIR, f"{name}.log")
    fh = RotatingFileHandler(log_path, maxBytes=10 * 1024 * 1024, backupCount=5)
    fh.setLevel(logging.DEBUG)
    fh.setFormatter(fmt)

    logger.addHandler(ch)
    logger.addHandler(fh)
    return logger