Source code for structlog._log_levels

Extracted log level data used by both stdlib and native log level filters.
import logging

from typing import Any, Callable, Type

from ._base import BoundLoggerBase
from .types import EventDict, FilteringBoundLogger

# Adapted from the stdlib
ERROR = 40
INFO = 20
DEBUG = 10

    "critical": CRITICAL,
    "exception": ERROR,
    "error": ERROR,
    "warn": WARNING,
    "warning": WARNING,
    "info": INFO,
    "debug": DEBUG,
    "notset": NOTSET,

    v: k
    for k, v in _NAME_TO_LEVEL.items()
    if k not in ("warn", "exception", "notset")

[docs]def add_log_level( logger: logging.Logger, method_name: str, event_dict: EventDict ) -> EventDict: """ Add the log level to the event dict under the ``level`` key. Since that's just the log method name, this processor works with non-stdlib logging as well. Therefore it's importable both from `structlog.processors` as well as from `structlog.stdlib`. .. versionadded:: 15.0.0 .. versionchanged:: 20.2.0 Importable from `structlog.processors` (additionally to `structlog.stdlib`). """ if method_name == "warn": # The stdlib has an alias method_name = "warning" event_dict["level"] = method_name return event_dict
def _nop(*args: Any, **kw: Any) -> Any: return None def exception(self: FilteringBoundLogger, event: str, **kw: Any) -> Any: kw.setdefault("exc_info", True) return self.error(event, **kw)
[docs]def make_filtering_bound_logger(min_level: int) -> Type[FilteringBoundLogger]: """ Create a new `FilteringBoundLogger` that only logs *min_level* or higher. The logger is optimized such that log levels below *min_level* only consist of a ``return None``. Compared to using ``structlog``'s standard library integration and the `structlog.stdlib.filter_by_level` processor: - It's faster because once the logger is built at program start, it's a static class. - For the same reason you can't change the log level once configured. Use the dynamic approach of `standard-library` instead, if you need this feature. :param min_level: The log level as an integer. You can use the constants from `logging` like ``logging.INFO`` or pass the values directly. See `this table from the logging docs <>`_ for possible values. .. versionadded:: 20.2.0 """ def make_method(level: int) -> Callable[..., Any]: if level < min_level: return _nop name = _LEVEL_TO_NAME[level] def meth(self: Any, event: str, **kw: Any) -> Any: return self._proxy_to_logger(name, event, **kw) meth.__name__ = name return meth meths = {} for lvl, name in _LEVEL_TO_NAME.items(): meths[name] = make_method(lvl) meths["exception"] = exception meths["fatal"] = meths["error"] meths["warn"] = meths["warning"] meths["msg"] = meths["info"] return type( "BoundLoggerFilteringAt%s" % (_LEVEL_TO_NAME.get(min_level, "Notset").capitalize()), (BoundLoggerBase,), meths, )