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# Copyright 2014 Google Inc. 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.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License 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.
"""Caching utility for the discovery document."""
from __future__ import absolute_import
import logging
import os
LOGGER = logging.getLogger(__name__)
DISCOVERY_DOC_MAX_AGE = 60 * 60 * 24 # 1 day
DISCOVERY_DOC_DIR = os.path.join(
os.path.dirname(os.path.realpath(__file__)), "documents"
)
def autodetect():
"""Detects an appropriate cache module and returns it.
Returns:
googleapiclient.discovery_cache.base.Cache, a cache object which
is auto detected, or None if no cache object is available.
"""
if "GAE_ENV" in os.environ:
try:
from . import appengine_memcache
return appengine_memcache.cache
except Exception:
pass
try:
from . import file_cache
return file_cache.cache
except Exception:
LOGGER.info(
"file_cache is only supported with oauth2client<4.0.0", exc_info=False
)
return None
def get_static_doc(serviceName, version):
"""Retrieves the discovery document from the directory defined in
DISCOVERY_DOC_DIR corresponding to the serviceName and version provided.
Args:
serviceName: string, name of the service.
version: string, the version of the service.
Returns:
A string containing the contents of the JSON discovery document,
otherwise None if the JSON discovery document was not found.
"""
content = None
doc_name = "{}.{}.json".format(serviceName, version)
try:
with open(os.path.join(DISCOVERY_DOC_DIR, doc_name), "r") as f:
content = f.read()
except FileNotFoundError:
# File does not exist. Nothing to do here.
pass
return content