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try:
import bz2
except ImportError:
bz2 = None
try:
import zlib
except ImportError:
zlib = None
try:
import cPickle as pickle
except ImportError:
import pickle
from peewee import BlobField
from peewee import buffer_type
class CompressedField(BlobField):
ZLIB = 'zlib'
BZ2 = 'bz2'
algorithm_to_import = {
ZLIB: zlib,
BZ2: bz2,
}
def __init__(self, compression_level=6, algorithm=ZLIB, *args,
**kwargs):
self.compression_level = compression_level
if algorithm not in self.algorithm_to_import:
raise ValueError('Unrecognized algorithm %s' % algorithm)
compress_module = self.algorithm_to_import[algorithm]
if compress_module is None:
raise ValueError('Missing library required for %s.' % algorithm)
self.algorithm = algorithm
self.compress = compress_module.compress
self.decompress = compress_module.decompress
super(CompressedField, self).__init__(*args, **kwargs)
def python_value(self, value):
if value is not None:
return self.decompress(value)
def db_value(self, value):
if value is not None:
return self._constructor(
self.compress(value, self.compression_level))
class PickleField(BlobField):
def python_value(self, value):
if value is not None:
if isinstance(value, buffer_type):
value = bytes(value)
return pickle.loads(value)
def db_value(self, value):
if value is not None:
pickled = pickle.dumps(value, pickle.HIGHEST_PROTOCOL)
return self._constructor(pickled)