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# Copyright 2012 Pinterest.com
#
# 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 logging
from io import BytesIO
import six
if six.PY2:
try:
import cPickle as pickle
except ImportError:
import pickle
else:
import pickle
try:
long_type = long # noqa
except NameError:
long_type = None
FLAG_PICKLE = 1 << 0
FLAG_INTEGER = 1 << 1
FLAG_LONG = 1 << 2
def python_memcache_serializer(key, value):
flags = 0
if isinstance(value, str):
pass
elif isinstance(value, int):
flags |= FLAG_INTEGER
value = "%d" % value
elif long_type is not None and isinstance(value, long_type):
flags |= FLAG_LONG
value = "%d" % value
else:
flags |= FLAG_PICKLE
output = BytesIO()
pickler = pickle.Pickler(output, 0)
pickler.dump(value)
value = output.getvalue()
return value, flags
def python_memcache_deserializer(key, value, flags):
if flags == 0:
return value
if flags & FLAG_INTEGER:
return int(value)
if flags & FLAG_LONG:
return long_type(value)
if flags & FLAG_PICKLE:
try:
buf = BytesIO(value)
unpickler = pickle.Unpickler(buf)
return unpickler.load()
except Exception:
logging.info('Pickle error', exc_info=True)
return None
return value
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