65 lines
2.2 KiB
Python
65 lines
2.2 KiB
Python
import logging
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import json
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from logging.handlers import RotatingFileHandler
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from pathlib import Path
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from datetime import datetime
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class JsonFormatter(logging.Formatter):
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"""
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Custom JSON log formatter for structured logging.
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"""
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def format(self, record: logging.LogRecord) -> str:
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log_object = {
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"timestamp": datetime.utcfromtimestamp(record.created).strftime("%Y-%m-%dT%H:%M:%SZ"),
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"level": record.levelname,
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"message": record.getMessage(),
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"module": record.module,
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"funcName": record.funcName,
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"line": record.lineno,
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}
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# Include any extra fields added via logger.info("msg", extra={...})
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if hasattr(record, "extra") and isinstance(record.extra, dict):
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log_object.update(record.extra)
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# Include exception info if present
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if record.exc_info:
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log_object["exception"] = self.formatException(record.exc_info)
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return json.dumps(log_object, ensure_ascii=False)
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def setup_logger(log_folder: Path, log_file_name: str = "rolling_rename.log", level=logging.INFO) -> logging.Logger:
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"""
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Sets up a logger that prints to console and writes to a rotating JSON log file.
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"""
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log_folder.mkdir(parents=True, exist_ok=True)
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log_file = log_folder / log_file_name
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logger = logging.getLogger("rolling_rename")
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logger.setLevel(level)
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logger.propagate = False # Prevent double logging
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# Formatters
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text_formatter = logging.Formatter(
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"%(asctime)s [%(levelname)s] %(message)s (%(module)s:%(lineno)d)",
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datefmt="%Y-%m-%d %H:%M:%S"
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)
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json_formatter = JsonFormatter()
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# Console handler (human-readable)
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console_handler = logging.StreamHandler()
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console_handler.setFormatter(text_formatter)
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console_handler.setLevel(level)
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# File handler (JSON logs)
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file_handler = RotatingFileHandler(log_file, maxBytes=5 * 1024 * 1024, backupCount=3, encoding="utf-8")
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file_handler.setFormatter(json_formatter)
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file_handler.setLevel(level)
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# Add handlers only once
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if not logger.handlers:
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logger.addHandler(console_handler)
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logger.addHandler(file_handler)
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return logger
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