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# Contributors Listed Below - COPYRIGHT 2016
# [+] International Business Machines Corp.
#
#
# 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.
import json
import os
# TODO: openbmc/openbmc#2994 remove python 2 support
import sys
if sys.version_info[0] < 3:
import cPickle as pickle
else:
import pickle
CACHE_PATH = '/var/cache/obmc/'
def getCacheFilename(obj_path, iface_name):
name = obj_path.replace('/', '.')
filename = CACHE_PATH + name[1:] + "@" + iface_name + ".props"
return filename
def save(obj_path, iface_name, properties):
print("Caching: "+ obj_path)
filename = getCacheFilename(obj_path, iface_name)
parent = os.path.dirname(filename)
try:
if not os.path.exists(parent):
os.makedirs(parent)
with open(filename, 'wb') as output:
try:
# use json module to convert dbus datatypes
props = json.dumps(properties[iface_name])
prop_obj = json.loads(props)
pickle.dump(prop_obj, output)
except Exception as e:
print("ERROR: " + str(e))
except Exception:
print("ERROR opening cache file: " + filename)
def load(obj_path, iface_name, properties):
# overlay with pickled data
filename = getCacheFilename(obj_path, iface_name)
if (os.path.isfile(filename)):
if iface_name in properties:
properties[iface_name] = {}
print("Loading from cache: " + filename)
try:
p = open(filename, 'rb')
data = pickle.load(p)
for prop in list(data.keys()):
properties[iface_name][prop] = data[prop]
except Exception as e:
print("ERROR: Loading cache file: " + str(e))
finally:
p.close()
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