| """Centralised logging configuration.""" | |
| from __future__ import annotations | |
| import logging | |
| import sys | |
| from typing import Optional | |
| _CONFIGURED = False | |
| _DEFAULT_FORMAT = "%(asctime)s | %(levelname)-7s | %(name)s | %(message)s" | |
| def setup_logging(level: str | int = "INFO", *, fmt: Optional[str] = None) -> None: | |
| """Configure the root logger once for the whole application.""" | |
| global _CONFIGURED | |
| if isinstance(level, str): | |
| level = logging.getLevelName(level.upper()) | |
| handler = logging.StreamHandler(stream=sys.stderr) | |
| handler.setFormatter(logging.Formatter(fmt or _DEFAULT_FORMAT)) | |
| root = logging.getLogger() | |
| root.setLevel(level) | |
| # Avoid duplicate handlers on repeated calls (e.g. in tests). | |
| for existing in list(root.handlers): | |
| root.removeHandler(existing) | |
| root.addHandler(handler) | |
| _CONFIGURED = True | |
| def get_logger(name: str) -> logging.Logger: | |
| """Return a module logger, ensuring logging has been configured.""" | |
| if not _CONFIGURED: | |
| setup_logging() | |
| return logging.getLogger(name) | |