75 lines
2.2 KiB
Python
75 lines
2.2 KiB
Python
import logging
|
|
import sys
|
|
import typing as t
|
|
|
|
from werkzeug.local import LocalProxy
|
|
|
|
from .globals import request
|
|
|
|
if t.TYPE_CHECKING: # pragma: no cover
|
|
from .app import Flask
|
|
|
|
|
|
@LocalProxy
|
|
def wsgi_errors_stream() -> t.TextIO:
|
|
"""Find the most appropriate error stream for the application. If a request
|
|
is active, log to ``wsgi.errors``, otherwise use ``sys.stderr``.
|
|
|
|
If you configure your own :class:`logging.StreamHandler`, you may want to
|
|
use this for the stream. If you are using file or dict configuration and
|
|
can't import this directly, you can refer to it as
|
|
``ext://flask.logging.wsgi_errors_stream``.
|
|
"""
|
|
return request.environ["wsgi.errors"] if request else sys.stderr
|
|
|
|
|
|
def has_level_handler(logger: logging.Logger) -> bool:
|
|
"""Check if there is a handler in the logging chain that will handle the
|
|
given logger's :meth:`effective level <~logging.Logger.getEffectiveLevel>`.
|
|
"""
|
|
level = logger.getEffectiveLevel()
|
|
current = logger
|
|
|
|
while current:
|
|
if any(handler.level <= level for handler in current.handlers):
|
|
return True
|
|
|
|
if not current.propagate:
|
|
break
|
|
|
|
current = current.parent # type: ignore
|
|
|
|
return False
|
|
|
|
|
|
#: Log messages to :func:`~flask.logging.wsgi_errors_stream` with the format
|
|
#: ``[%(asctime)s] %(levelname)s in %(module)s: %(message)s``.
|
|
default_handler = logging.StreamHandler(wsgi_errors_stream) # type: ignore
|
|
default_handler.setFormatter(
|
|
logging.Formatter("[%(asctime)s] %(levelname)s in %(module)s: %(message)s")
|
|
)
|
|
|
|
|
|
def create_logger(app: "Flask") -> logging.Logger:
|
|
"""Get the Flask app's logger and configure it if needed.
|
|
|
|
The logger name will be the same as
|
|
:attr:`app.import_name <flask.Flask.name>`.
|
|
|
|
When :attr:`~flask.Flask.debug` is enabled, set the logger level to
|
|
:data:`logging.DEBUG` if it is not set.
|
|
|
|
If there is no handler for the logger's effective level, add a
|
|
:class:`~logging.StreamHandler` for
|
|
:func:`~flask.logging.wsgi_errors_stream` with a basic format.
|
|
"""
|
|
logger = logging.getLogger(app.name)
|
|
|
|
if app.debug and not logger.level:
|
|
logger.setLevel(logging.DEBUG)
|
|
|
|
if not has_level_handler(logger):
|
|
logger.addHandler(default_handler)
|
|
|
|
return logger
|