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import logging
import sys
from typing import Optional
_DEFAULT_FORMAT = "%(asctime)s %(levelname)s %(message)s"
def _ensure_root_handler() -> None:
root_logger = logging.getLogger()
if root_logger.handlers:
return
handler = logging.StreamHandler(stream=sys.stdout)
formatter = logging.Formatter(_DEFAULT_FORMAT)
handler.setFormatter(formatter)
root_logger.addHandler(handler)
root_logger.setLevel(logging.INFO)
class _TaggedAdapter(logging.LoggerAdapter):
def process(self, msg, kwargs):
tag = self.extra.get("tag", "")
if tag and not str(msg).startswith(tag):
msg = f"{tag} {msg}"
return msg, kwargs
def get_logger(tag: str, name: Optional[str] = None) -> logging.Logger:
_ensure_root_handler()
logger_name = name or __name__
base = logging.getLogger(logger_name)
return _TaggedAdapter(base, {"tag": f"[{tag}]"})
import logging
import sys
from typing import Optional
_DEFAULT_FORMAT = "%(asctime)s %(levelname)s %(message)s"
def _ensure_root_handler() -> None:
root_logger = logging.getLogger()
if root_logger.handlers:
return
handler = logging.StreamHandler(stream=sys.stdout)
formatter = logging.Formatter(_DEFAULT_FORMAT)
handler.setFormatter(formatter)
root_logger.addHandler(handler)
root_logger.setLevel(logging.INFO)
class _TaggedAdapter(logging.LoggerAdapter):
def process(self, msg, kwargs):
tag = self.extra.get("tag", "")
if tag and not str(msg).startswith(tag):
msg = f"{tag} {msg}"
return msg, kwargs
def get_logger(tag: str, name: Optional[str] = None) -> logging.Logger:
"""
Return a logger that injects a [TAG] prefix into records.
Example: logger = get_logger("APP") → logs like: [APP] message
"""
_ensure_root_handler()
logger_name = name or __name__
base = logging.getLogger(logger_name)
return _TaggedAdapter(base, {"tag": f"[{tag}]"})
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