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# Copyright 2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# https://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.

import logging

from boto3.compat import _warn_deprecated_python
from boto3.session import Session

__author__ = 'Amazon Web Services'
__version__ = '1.34.6'


# The default Boto3 session; autoloaded when needed.
DEFAULT_SESSION = None


def setup_default_session(**kwargs):
    """
    Set up a default session, passing through any parameters to the session
    constructor. There is no need to call this unless you wish to pass custom
    parameters, because a default session will be created for you.
    """
    global DEFAULT_SESSION
    DEFAULT_SESSION = Session(**kwargs)


def set_stream_logger(name='boto3', level=logging.DEBUG, format_string=None):
    """
    Add a stream handler for the given name and level to the logging module.
    By default, this logs all boto3 messages to ``stdout``.

        >>> import boto3
        >>> boto3.set_stream_logger('boto3.resources', logging.INFO)

    For debugging purposes a good choice is to set the stream logger to ``''``
    which is equivalent to saying "log everything".

    .. WARNING::
       Be aware that when logging anything from ``'botocore'`` the full wire
       trace will appear in your logs. If your payloads contain sensitive data
       this should not be used in production.

    :type name: string
    :param name: Log name
    :type level: int
    :param level: Logging level, e.g. ``logging.INFO``
    :type format_string: str
    :param format_string: Log message format
    """
    if format_string is None:
        format_string = "%(asctime)s %(name)s [%(levelname)s] %(message)s"

    logger = logging.getLogger(name)
    logger.setLevel(level)
    handler = logging.StreamHandler()
    handler.setLevel(level)
    formatter = logging.Formatter(format_string)
    handler.setFormatter(formatter)
    logger.addHandler(handler)


def _get_default_session():
    """
    Get the default session, creating one if needed.

    :rtype: :py:class:`~boto3.session.Session`
    :return: The default session
    """
    if DEFAULT_SESSION is None:
        setup_default_session()
    _warn_deprecated_python()

    return DEFAULT_SESSION


def client(*args, **kwargs):
    """
    Create a low-level service client by name using the default session.

    See :py:meth:`boto3.session.Session.client`.
    """
    return _get_default_session().client(*args, **kwargs)


def resource(*args, **kwargs):
    """
    Create a resource service client by name using the default session.

    See :py:meth:`boto3.session.Session.resource`.
    """
    return _get_default_session().resource(*args, **kwargs)


# Set up logging to ``/dev/null`` like a library is supposed to.
# https://docs.python.org/3.3/howto/logging.html#configuring-logging-for-a-library
class NullHandler(logging.Handler):
    def emit(self, record):
        pass


logging.getLogger('boto3').addHandler(NullHandler())