7d83c0dbeb
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2898 fd906abe-77d9-0310-91a1-e0d9ade77398
129 lines
3.8 KiB
Python
129 lines
3.8 KiB
Python
#
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# Copyright (c) 2006 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Storing data in files in the file system.
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$Id$
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"""
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import os
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from zope.interface import implements
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import transaction
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from transaction.interfaces import IDataManager
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import cybertools
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from cybertools.storage.interfaces import IExternalStorage
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DEFAULT_DIRECTORY = 'extfiles'
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class FileSystemStorage(object):
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implements(IExternalStorage)
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def __init__(self, rootDir=None, subDir=None):
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self.rootDir = rootDir
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self.subDir = subDir
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def getDir(self, address, subDir=None):
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subDir = subDir or self.subDir
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if self.rootDir is None:
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return os.path.join(subDir, address)
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return os.path.join(self.rootDir, subDir, address)
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def setData(self, address, data, params={}):
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subDir = params.get('subdirectory')
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fn = self.getDir(address, subDir)
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directory = os.path.dirname(fn)
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if not os.path.exists(directory):
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os.makedirs(directory)
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f = open(fn, 'wb')
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f.write(data)
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f.close()
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#print 'cybertools.storage: file %s written' % fn
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# TODO: transaction management:
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# write to temp file in subDir, keep address in internal dictionary
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# transaction.manager.get().join(FSSDataManager(address, temp))
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# then rename in tpc_finish() and remove temp file in tpc_abort
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def getData(self, address, params={}):
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subDir = params.get('subdirectory')
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fn = self.getDir(address, subDir)
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f = open(fn, 'rb')
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data = f.read()
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f.close()
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return data
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def getUniqueAddress(self, address, params={}):
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subDir = params.get('subdirectory')
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return self.getDir(address, subDir)
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class FSSDataManager(object):
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implements(IDataManager)
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transaction_manager = None
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def __init__(self, address, temp):
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self.address = address
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self.temp = temp
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self.transaction_manager = transaction.manager
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def abort(self, transaction):
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# remove temp file
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pass
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def tpc_begin(self, transaction):
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pass
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def commit(self, transaction):
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# rename original file if present to a temporary name
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# rename temp file to original name
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pass
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def tpc_vote(self, transaction):
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pass
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def tpc_finish(self, transaction):
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# remove renamed original file
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pass
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def tpc_abort(self, transaction):
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# rename back original file (removing renamed temp file)
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pass
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def sortKey(self):
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return 'cybertools.storage.FileSystemStorage:' + self.address
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def explicitDirectoryStorage(dirname):
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""" This cannot be used as a utility but must be called explicitly."""
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return FileSystemStorage('', dirname)
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def fullPathStorage():
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return FileSystemStorage()
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def instanceVarSubdirectoryStorage(dirname=DEFAULT_DIRECTORY):
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instanceHome = os.path.dirname(os.path.dirname(os.path.dirname(
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os.path.dirname(cybertools.__file__))))
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varDir = os.path.join(instanceHome, 'var');
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return FileSystemStorage(varDir, dirname)
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