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# Copyright (c) 2017-2018 Wind River Systems, Inc.
#
# 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.
import json
import logging
from django.core.cache import cache
logger = logging.getLogger(__name__)
# note: memcached key length should be < 250, the value < 1MB
def flush_cache_by_url(resource_url):
try:
# this is to invalidate similar cache data blindly
resource_wo_query = resource_url.split("?", 1)[0]
cache.delete("AAI_" + resource_wo_query)
except:
pass # silently drop any exception
def get_cache_by_url(resource_url):
try:
if filter_cache_by_url(resource_url):
value = cache.get("AAI_" + resource_url)
# logger.debug("Find cache the resource: %s, %s" %( resource_url, value))
return json.loads(value) if value else None
else:
return None
except Exception as e:
logger.error("get_cache_by_url exception: %s" % str(e))
return None
def set_cache_by_url(resource_url, resource_in_json):
try:
# filter out unmanaged AAI resource
if filter_cache_by_url(resource_url):
# cache the resource for 24 hours
# logger.debug("Cache the resource: "+ resource_url)
cache.set("AAI_" + resource_url,
json.dumps(resource_in_json), 3600 * 24)
except Exception as e:
logger.error("get_cache_by_url exception: %s" % str(e))
def filter_cache_by_url(resource_url):
# cannot cache url with query string, e.g. depth=all
if resource_url.find(r"?") >= 0:
return False
# hardcoded filter: cloud region only
if resource_url.find(r"cloud-infrastructure/cloud-regions/cloud-region") >= 0:
return True
else:
return False
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