Move native loggers into a separate, named module

src/structlog/__init__.py

@@ -29,7 +29,7 @@
     wrap_logger,
 )
 from structlog._generic import BoundLogger
-from structlog._log_levels import make_filtering_bound_logger
+from structlog._native import make_filtering_bound_logger
 from structlog._output import (
     BytesLogger,
     BytesLoggerFactory,

src/structlog/_config.py

@@ -15,7 +15,7 @@
 
 from typing import Any, Callable, Iterable, Sequence, Type, cast
 
-from ._log_levels import make_filtering_bound_logger
+from ._native import make_filtering_bound_logger
 from ._output import PrintLoggerFactory
 from .contextvars import merge_contextvars
 from .dev import ConsoleRenderer, _has_colors, set_exc_info

src/structlog/_log_levels.py

@@ -9,16 +9,9 @@
 
 from __future__ import annotations
 
-import asyncio
-import contextvars
 import logging
-import sys
 
-from typing import Any, Callable
-
-from ._base import BoundLoggerBase
-from .contextvars import _ASYNC_CALLING_STACK
-from .typing import EventDict, FilteringBoundLogger
+from .typing import EventDict
 
 
 # Adapted from the stdlib
@@ -71,209 +64,3 @@ def add_log_level(
     event_dict["level"] = method_name
 
     return event_dict
-
-
-def _nop(self: Any, event: str, *args: Any, **kw: Any) -> Any:
-    return None
-
-
-async def _anop(self: Any, event: str, *args: Any, **kw: Any) -> Any:
-    return None
-
-
-def exception(
-    self: FilteringBoundLogger, event: str, *args: Any, **kw: Any
-) -> Any:
-    kw.setdefault("exc_info", True)
-
-    return self.error(event, *args, **kw)
-
-
-async def aexception(
-    self: FilteringBoundLogger, event: str, *args: Any, **kw: Any
-) -> Any:
-    """
-    .. versionchanged:: 23.3.0
-       Callsite parameters are now also collected under asyncio.
-    """
-    # Exception info has to be extracted this early, because it is no longer
-    # available once control is passed to the executor.
-    if kw.get("exc_info", True) is True:
-        kw["exc_info"] = sys.exc_info()
-
-    scs_token = _ASYNC_CALLING_STACK.set(sys._getframe().f_back)  # type: ignore[arg-type]
-    ctx = contextvars.copy_context()
-    try:
-        runner = await asyncio.get_running_loop().run_in_executor(
-            None,
-            lambda: ctx.run(lambda: self.error(event, *args, **kw)),
-        )
-    finally:
-        _ASYNC_CALLING_STACK.reset(scs_token)
-
-    return runner
-
-
-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``.
-
-    All familiar log methods are present, with async variants of each that are
-    prefixed by an ``a``. Therefore, the async version of ``log.info("hello")``
-    is ``await log.ainfo("hello")``.
-
-    Additionally it has a ``log(self, level: int, **kw: Any)`` method to mirror
-    `logging.Logger.log` and `structlog.stdlib.BoundLogger.log`.
-
-    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.
-    - You *can* have (much) more fine-grained filtering by :ref:`writing a
-      simple processor <finer-filtering>`.
-
-    Args:
-        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
-            <https://docs.python.org/3/library/logging.html#levels>`_ for
-            possible values.
-
-    .. versionadded:: 20.2.0
-    .. versionchanged:: 21.1.0 The returned loggers are now pickleable.
-    .. versionadded:: 20.1.0 The ``log()`` method.
-    .. versionadded:: 22.2.0
-       Async variants ``alog()``, ``adebug()``, ``ainfo()``, and so forth.
-    """
-
-    return _LEVEL_TO_FILTERING_LOGGER[min_level]
-
-
-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``.
-    """
-
-    def make_method(
-        level: int,
-    ) -> tuple[Callable[..., Any], Callable[..., Any]]:
-        if level < min_level:
-            return _nop, _anop
-
-        name = _LEVEL_TO_NAME[level]
-
-        def meth(self: Any, event: str, *args: Any, **kw: Any) -> Any:
-            if not args:
-                return self._proxy_to_logger(name, event, **kw)
-
-            return self._proxy_to_logger(name, event % args, **kw)
-
-        async def ameth(self: Any, event: str, *args: Any, **kw: Any) -> Any:
-            """
-            .. versionchanged:: 23.3.0
-               Callsite parameters are now also collected under asyncio.
-            """
-            if args:
-                event = event % args
-
-            scs_token = _ASYNC_CALLING_STACK.set(sys._getframe().f_back)  # type: ignore[arg-type]
-            ctx = contextvars.copy_context()
-            try:
-                await asyncio.get_running_loop().run_in_executor(
-                    None,
-                    lambda: ctx.run(
-                        lambda: self._proxy_to_logger(name, event, **kw)
-                    ),
-                )
-            finally:
-                _ASYNC_CALLING_STACK.reset(scs_token)
-
-        meth.__name__ = name
-        ameth.__name__ = f"a{name}"
-
-        return meth, ameth
-
-    def log(self: Any, level: int, event: str, *args: Any, **kw: Any) -> Any:
-        if level < min_level:
-            return None
-        name = _LEVEL_TO_NAME[level]
-
-        if not args:
-            return self._proxy_to_logger(name, event, **kw)
-
-        return self._proxy_to_logger(name, event % args, **kw)
-
-    async def alog(
-        self: Any, level: int, event: str, *args: Any, **kw: Any
-    ) -> Any:
-        """
-        .. versionchanged:: 23.3.0
-           Callsite parameters are now also collected under asyncio.
-        """
-        if level < min_level:
-            return None
-        name = _LEVEL_TO_NAME[level]
-        if args:
-            event = event % args
-
-        scs_token = _ASYNC_CALLING_STACK.set(sys._getframe().f_back)  # type: ignore[arg-type]
-        ctx = contextvars.copy_context()
-        try:
-            runner = await asyncio.get_running_loop().run_in_executor(
-                None,
-                lambda: ctx.run(
-                    lambda: self._proxy_to_logger(name, event, **kw)
-                ),
-            )
-        finally:
-            _ASYNC_CALLING_STACK.reset(scs_token)
-        return runner
-
-    meths: dict[str, Callable[..., Any]] = {"log": log, "alog": alog}
-    for lvl, name in _LEVEL_TO_NAME.items():
-        meths[name], meths[f"a{name}"] = make_method(lvl)
-
-    meths["exception"] = exception
-    meths["aexception"] = aexception
-    meths["fatal"] = meths["error"]
-    meths["afatal"] = meths["aerror"]
-    meths["warn"] = meths["warning"]
-    meths["awarn"] = meths["awarning"]
-    meths["msg"] = meths["info"]
-    meths["amsg"] = meths["ainfo"]
-
-    return type(
-        "BoundLoggerFilteringAt%s"
-        % (_LEVEL_TO_NAME.get(min_level, "Notset").capitalize()),
-        (BoundLoggerBase,),
-        meths,
-    )
-
-
-# Pre-create all possible filters to make them pickleable.
-BoundLoggerFilteringAtNotset = _make_filtering_bound_logger(NOTSET)
-BoundLoggerFilteringAtDebug = _make_filtering_bound_logger(DEBUG)
-BoundLoggerFilteringAtInfo = _make_filtering_bound_logger(INFO)
-BoundLoggerFilteringAtWarning = _make_filtering_bound_logger(WARNING)
-BoundLoggerFilteringAtError = _make_filtering_bound_logger(ERROR)
-BoundLoggerFilteringAtCritical = _make_filtering_bound_logger(CRITICAL)
-
-_LEVEL_TO_FILTERING_LOGGER = {
-    CRITICAL: BoundLoggerFilteringAtCritical,
-    ERROR: BoundLoggerFilteringAtError,
-    WARNING: BoundLoggerFilteringAtWarning,
-    INFO: BoundLoggerFilteringAtInfo,
-    DEBUG: BoundLoggerFilteringAtDebug,
-    NOTSET: BoundLoggerFilteringAtNotset,
-}