<commit_before># -*- coding: utf-8 -*-
"""
This module provides methods for interacting with Hashicorp Vault via the HVAC
library.
"""
from __future__ import absolute_import

import logging
import inspect
import time
from functools import wraps

log = logging.getLogger(__name__)
EXCLUDED_HVAC_FUNCTIONS = ['initialize']

try:
    import hvac
    import requests
    DEPS_INSTALLED = True
except ImportError:
    log.debug('Unable to import the HVAC library.')
    DEPS_INSTALLED = False

__all__ = ['initialize', 'is_initialized']

class InsufficientParameters(Exception):
    pass

def __virtual__():
    return DEPS_INSTALLED


def _cache_client(client_builder):
    _client = []
    @wraps(client_builder)
    def get_client(*args, **kwargs):
        if not _client:
            _client.append(client_builder(*args, **kwargs))
        return _client[0]<commit_msg>Added missing import for datetime module<commit_after># -*- coding: utf-8 -*-
"""
This module provides methods for interacting with Hashicorp Vault via the HVAC
library.
"""
from __future__ import absolute_import

import logging
import inspect
import time
from functools import wraps
from datetime import datetime, timedelta

log = logging.getLogger(__name__)
EXCLUDED_HVAC_FUNCTIONS = ['initialize']

try:
    import hvac
    import requests
    DEPS_INSTALLED = True
except ImportError:
    log.debug('Unable to import the HVAC library.')
    DEPS_INSTALLED = False

__all__ = ['initialize', 'is_initialized']

class InsufficientParameters(Exception):
    pass

def __virtual__():
    return DEPS_INSTALLED


def _cache_client(client_builder):
    _client = []
    @wraps(client_builder)
    def get_client(*args, **kwargs):
        if not _client:
            _client.append(client_builder(*args, **kwargs))
        return _client[0]
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