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# 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 e