spb/wp15_uqo

1"""Structured logging: console + per-run JSONL file under logs/."""23from __future__ import annotations45import json6import logging7import sys8import time9from pathlib import Path101112class JsonlHandler(logging.Handler):13    def __init__(self, path: Path):14        super().__init__()15        path.parent.mkdir(parents=True, exist_ok=True)16        self._f = open(path, "a")1718    def emit(self, record: logging.LogRecord) -> None:19        entry = {20            "ts": time.strftime("%Y-%m-%dT%H:%M:%S%z"),21            "level": record.levelname,22            "name": record.name,23            "msg": record.getMessage(),24        }25        if hasattr(record, "extra_fields"):26            entry.update(record.extra_fields)27        self._f.write(json.dumps(entry) + "\n")28        self._f.flush()293031def get_logger(name: str, logfile: Path | None = None) -> logging.Logger:32    logger = logging.getLogger(name)33    if logger.handlers:34        return logger35    logger.setLevel(logging.INFO)36    sh = logging.StreamHandler(sys.stderr)37    sh.setFormatter(logging.Formatter("%(asctime)s %(levelname)s %(name)s: %(message)s"))38    logger.addHandler(sh)39    if logfile is not None:40        logger.addHandler(JsonlHandler(logfile))41    return logger42