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162 lines
4.0 KiB
162 lines
4.0 KiB
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# Copyright 2011-2013 Codernity (http://codernity.com)
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import struct
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import shutil
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import marshal
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import io
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try:
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from CodernityDB3 import __version__
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except ImportError:
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from .__init__ import __version__
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class StorageException(Exception):
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pass
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class DummyStorage(object):
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"""
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Storage mostly used to fake real storage
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"""
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def create(self, *args, **kwargs):
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pass
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def open(self, *args, **kwargs):
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pass
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def close(self, *args, **kwargs):
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pass
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def data_from(self, *args, **kwargs):
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pass
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def data_to(self, *args, **kwargs):
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pass
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def save(self, *args, **kwargs):
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return 0, 0
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def insert(self, *args, **kwargs):
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return self.save(*args, **kwargs)
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def update(self, *args, **kwargs):
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return 0, 0
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def get(self, *args, **kwargs):
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return None
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# def compact(self, *args, **kwargs):
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# pass
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def fsync(self, *args, **kwargs):
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pass
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def flush(self, *args, **kwargs):
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pass
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class IU_Storage(object):
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__version__ = __version__
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def __init__(self, db_path, name='main'):
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if isinstance(db_path, bytes):
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db_path = db_path.decode()
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if isinstance(name, bytes):
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name = name.decode()
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self.db_path = db_path
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self.name = name
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self._header_size = 100
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def create(self):
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if os.path.exists(os.path.join(self.db_path, self.name + "_stor")):
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raise IOError("Storage already exists!")
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with io.open(os.path.join(self.db_path, self.name + "_stor"), 'wb') as f:
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if isinstance(self.__version__, str):
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new_version = self.__version__.encode()
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else:
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new_version = self.__version__
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f.write(struct.pack(b'10s90s', new_version, b'|||||'))
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f.close()
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self._f = io.open(os.path.join(
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self.db_path, self.name + "_stor"), 'r+b', buffering=0)
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self.flush()
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self._f.seek(0, 2)
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def open(self):
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if not os.path.exists(os.path.join(self.db_path, self.name + "_stor")):
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raise IOError("Storage doesn't exists!")
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self._f = io.open(os.path.join(
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self.db_path, self.name + "_stor"), 'r+b', buffering=0)
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self.flush()
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self._f.seek(0, 2)
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def destroy(self):
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os.unlink(os.path.join(self.db_path, self.name + '_stor'))
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def close(self):
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self._f.close()
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# self.flush()
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# self.fsync()
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def data_from(self, data):
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return marshal.loads(data)
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def data_to(self, data):
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return marshal.dumps(data)
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def save(self, data):
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s_data = self.data_to(data)
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self._f.seek(0, 2)
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start = self._f.tell()
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size = len(s_data)
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self._f.write(s_data)
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self.flush()
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return start, size
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def insert(self, data):
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return self.save(data)
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def update(self, data):
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return self.save(data)
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def get(self, start, size, status='c'):
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if status == 'd':
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return None
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else:
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self._f.seek(start)
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return self.data_from(self._f.read(size))
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def flush(self):
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self._f.flush()
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def fsync(self):
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os.fsync(self._f.fileno())
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# classes for public use, done in this way because of
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# generation static files with indexes (_index directory)
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class Storage(IU_Storage):
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pass
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