# SPDX-License-Identifier: MIT OR Apache-2.0
# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the MIT License. See the LICENSE file in the root of this
# repository for complete details.
"""
Type information used throughout ``structlog``.
For now, they are considered provisional. Especially `BindableLogger` will
probably change to something more elegant.
.. versionadded:: 20.2
"""
import sys
from types import TracebackType
from typing import (
Any,
Callable,
Dict,
Mapping,
MutableMapping,
Optional,
TextIO,
Tuple,
Type,
Union,
)
# This construct works better with Mypy.
# Doing the obvious ImportError route leads to an 'Incompatible import of
# "Protocol"' error.
if sys.version_info >= (3, 8):
from typing import Protocol, runtime_checkable
else:
from typing_extensions import Protocol, runtime_checkable
WrappedLogger = Any
"""
A logger that is wrapped by a bound logger and is ultimately responsible for
the output of the log entries.
``structlog`` makes *no* assumptions about it.
.. versionadded:: 20.2
"""
Context = Union[Dict[str, Any], Dict[Any, Any]]
"""
A dict-like context carrier.
.. versionadded:: 20.2
"""
EventDict = MutableMapping[str, Any]
"""
An event dictionary as it is passed into processors.
It's created by copying the configured `Context` but doesn't need to support
copy itself.
.. versionadded:: 20.2
"""
Processor = Callable[
[WrappedLogger, str, EventDict],
Union[Mapping[str, Any], str, bytes, bytearray, Tuple[Any, ...]],
]
"""
A callable that is part of the processor chain.
See :doc:`processors`.
.. versionadded:: 20.2
"""
ExcInfo = Tuple[Type[BaseException], BaseException, Optional[TracebackType]]
"""
An exception info tuple as returned by `sys.exc_info`.
.. versionadded:: 20.2
"""
ExceptionFormatter = Callable[[TextIO, ExcInfo], None]
"""
A callable that pretty-prints an `ExcInfo` into a file-like object.
Used by `structlog.dev.ConsoleRenderer`.
.. versionadded:: 21.2
"""
[docs]@runtime_checkable
class BindableLogger(Protocol):
"""
**Protocol**: Methods shared among all bound loggers and that are relied on
by ``structlog``.
.. versionadded:: 20.2
"""
_context: Context
def bind(self, **new_values: Any) -> "BindableLogger":
...
def unbind(self, *keys: str) -> "BindableLogger":
...
def try_unbind(self, *keys: str) -> "BindableLogger":
...
def new(self, **new_values: Any) -> "BindableLogger":
...
[docs]class FilteringBoundLogger(BindableLogger, Protocol):
"""
**Protocol**: A `BindableLogger` that filters by a level.
The only way to instantiate one is using `make_filtering_bound_logger`.
.. versionadded:: 20.2.0
"""
def debug(self, event: str, **kw: Any) -> Any:
"""
Log *event* with **kw** at **debug** level.
"""
def info(self, event: str, **kw: Any) -> Any:
"""
Log *event* with **kw** at **info** level.
"""
def warning(self, event: str, **kw: Any) -> Any:
"""
Log *event* with **kw** at **warn** level.
"""
def warn(self, event: str, **kw: Any) -> Any:
"""
Log *event* with **kw** at **warn** level.
"""
def error(self, event: str, **kw: Any) -> Any:
"""
Log *event* with **kw** at **error** level.
"""
def err(self, event: str, **kw: Any) -> Any:
"""
Log *event* with **kw** at **error** level.
"""
def fatal(self, event: str, **kw: Any) -> Any:
"""
Log *event* with **kw** at **critical** level.
"""
def exception(self, event: str, **kw: Any) -> Any:
"""
Log *event* with **kw** at **error** level and ensure that ``exc_info``
is set in the event dictionary.
"""
def critical(self, event: str, **kw: Any) -> Any:
"""
Log *event* with **kw** at **critical** level.
"""
def msg(self, event: str, **kw: Any) -> Any:
"""
Log *event* with **kw** at **info** level.
"""