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log.py

# sqlalchemy/log.py
# Copyright (C) 2006-2021 the SQLAlchemy authors and contributors
# <see AUTHORS file>
# Includes alterations by Vinay Sajip vinay_sajip@yahoo.co.uk
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php

"""Logging control and utilities.

Control of logging for SA can be performed from the regular python logging
module.  The regular dotted module namespace is used, starting at
'sqlalchemy'.  For class-level logging, the class name is appended.

The "echo" keyword parameter, available on SQLA :class:`_engine.Engine`
and :class:`_pool.Pool` objects, corresponds to a logger specific to that
instance only.

"""

import logging
import sys

# set initial level to WARN.  This so that
# log statements don't occur in the absence of explicit
# logging being enabled for 'sqlalchemy'.
rootlogger = logging.getLogger("sqlalchemy")
if rootlogger.level == logging.NOTSET:
    rootlogger.setLevel(logging.WARN)

def _add_default_handler(logger):
    handler = logging.StreamHandler(sys.stdout)
    handler.setFormatter(
        logging.Formatter("%(asctime)s %(levelname)s %(name)s %(message)s")
    )
    logger.addHandler(handler)

_logged_classes = set()

def class_logger(cls):
    logger = logging.getLogger(cls.__module__ + "." + cls.__name__)
    cls._should_log_debug = lambda self: logger.isEnabledFor(logging.DEBUG)
    cls._should_log_info = lambda self: logger.isEnabledFor(logging.INFO)
    cls.logger = logger
    _logged_classes.add(cls)
    return cls

class Identified(object):
    logging_name = None

def _should_log_debug(self):
        return self.logger.isEnabledFor(logging.DEBUG)

def _should_log_info(self):
        return self.logger.isEnabledFor(logging.INFO)

class InstanceLogger(object):
    """A logger adapter (wrapper) for :class:`.Identified` subclasses.

This allows multiple instances (e.g. Engine or Pool instances)
    to share a logger, but have its verbosity controlled on a
    per-instance basis.

The basic functionality is to return a logging level
    which is based on an instance's echo setting.

Default implementation is:

'debug' -> logging.DEBUG
    True    -> logging.INFO
    False   -> Effective level of underlying logger (
    logging.WARNING by default)
    None    -> same as False
    """

# Map echo settings to logger levels
    _echo_map = {
        None: logging.NOTSET,
        False: logging.NOTSET,
        True: logging.INFO,
        "debug": logging.DEBUG,
    }

def __init__(self, echo, name):
        self.echo = echo
        self.logger = logging.getLogger(name)

# if echo flag is enabled and no handlers,
        # add a handler to the list
        if self._echo_map[echo] <= logging.INFO and not self.logger.handlers:
            _add_default_handler(self.logger)

#
    # Boilerplate convenience methods
    #
    def debug(self, msg, *args, **kwargs):
        """Delegate a debug call to the underlying logger."""

self.log(logging.DEBUG, msg, *args, **kwargs)

def info(self, msg, *args, **kwargs):
        """Delegate an info call to the underlying logger."""

self.log(logging.INFO, msg, *args, **kwargs)

def warning(self, msg, *args, **kwargs):
        """Delegate a warning call to the underlying logger."""

self.log(logging.WARNING, msg, *args, **kwargs)

warn = warning

def error(self, msg, *args, **kwargs):
        """
        Delegate an error call to the underlying logger.
        """
        self.log(logging.ERROR, msg, *args, **kwargs)

def exception(self, msg, *args, **kwargs):
        """Delegate an exception call to the underlying logger."""

kwargs["exc_info"] = 1
        self.log(logging.ERROR, msg, *args, **kwargs)

def critical(self, msg, *args, **kwargs):
        """Delegate a critical call to the underlying logger."""

self.log(logging.CRITICAL, msg, *args, **kwargs)

def log(self, level, msg, *args, **kwargs):
        """Delegate a log call to the underlying logger.

The level here is determined by the echo
        flag as well as that of the underlying logger, and
        logger._log() is called directly.

"""

# inline the logic from isEnabledFor(),
        # getEffectiveLevel(), to avoid overhead.

if self.logger.manager.disable >= level:
            return

selected_level = self._echo_map[self.echo]
        if selected_level == logging.NOTSET:
            selected_level = self.logger.getEffectiveLevel()

if level >= selected_level:
            self.logger._log(level, msg, args, **kwargs)

def isEnabledFor(self, level):
        """Is this logger enabled for level 'level'?"""

if self.logger.manager.disable >= level:
            return False
        return level >= self.getEffectiveLevel()

def getEffectiveLevel(self):
        """What's the effective level for this logger?"""

level = self._echo_map[self.echo]
        if level == logging.NOTSET:
            level = self.logger.getEffectiveLevel()
        return level

def instance_logger(instance, echoflag=None):
    """create a logger for an instance that implements :class:`.Identified`."""

if instance.logging_name:
        name = "%s.%s.%s" % (
            instance.__class__.__module__,
            instance.__class__.__name__,
            instance.logging_name,
        )
    else:
        name = "%s.%s" % (
            instance.__class__.__module__,
            instance.__class__.__name__,
        )

instance._echo = echoflag

if echoflag in (False, None):
        # if no echo setting or False, return a Logger directly,
        # avoiding overhead of filtering
        logger = logging.getLogger(name)
    else:
        # if a specified echo flag, return an EchoLogger,
        # which checks the flag, overrides normal log
        # levels by calling logger._log()
        logger = InstanceLogger(echoflag, name)

instance.logger = logger

class echo_property(object):
    __doc__ = """\
    When ``True``, enable log output for this element.

This has the effect of setting the Python logging level for the namespace
    of this element's class and object reference.  A value of boolean ``True``
    indicates that the loglevel ``logging.INFO`` will be set for the logger,
    whereas the string value ``debug`` will set the loglevel to
    ``logging.DEBUG``.
    """

def __get__(self, instance, owner):
        if instance is None:
            return self
        else:
            return instance._echo

def __set__(self, instance, value):
        instance_logger(instance, echoflag=value)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
..	dir	-	root/root	drwxr-xr-x	2026-08-21 10:59:42
__pycache__	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
connectors	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
databases	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
dialects	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
engine	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
event	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
ext	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
orm	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
pool	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
sql	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
testing	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
util	dir	-	root/root	drwxr-xr-x	2026-07-21 10:59:48
__init__.py	text/x-script.python	4.68 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
cprocessors.cpython-311-x86_64-linux-gnu.so	application/x-pie-executable	19.04 KB	root/root	-rwxr-xr-x	2026-06-16 08:48:20
cresultproxy.cpython-311-x86_64-linux-gnu.so	application/x-pie-executable	27.52 KB	root/root	-rwxr-xr-x	2026-06-16 08:48:20
cutils.cpython-311-x86_64-linux-gnu.so	application/x-pie-executable	16.32 KB	root/root	-rwxr-xr-x	2026-06-16 08:48:20
events.py	text/x-script.python	52.37 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
exc.py	text/x-script.python	17.46 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
inspection.py	text/x-script.python	2.96 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
interfaces.py	text/x-script.python	12.44 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
log.py	text/x-script.python	6.55 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
processors.py	text/x-script.python	5.61 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
schema.py	text/x-script.python	2.41 KB	root/root	-rw-r--r--	2026-06-16 08:48:19
types.py	text/x-script.python	3.3 KB	root/root	-rw-r--r--	2026-06-16 08:48:19