* not used

pisi/lockeddb.py

@@ -1,100 +0,0 @@
-# -*- coding: utf-8 -*-
-#
-# Copyright (C) 2005, TUBITAK/UEKAE
-#
-# This program is free software; you can redistribute it and/or modify it under
-# the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 2 of the License, or (at your option)
-# any later version.
-#
-# Please read the COPYING file.
-#
-#
-# Authors:  Eray Ozkural <eray@uludag.org.tr>
-
-import bsddb3.db as db
-import os
-import fcntl
-import types
-
-import gettext
-__trans = gettext.translation('pisi', fallback=True)
-_ = __trans.ugettext
-
-import pisi
-import pisi.context
-
-class Error(pisi.Error):
-    pass
-
-class LockedDB:
-
-    def __init__(self, dbname, mode=0644,
-                 filetype=db.DB_BTREE, dbenv=None):
-        if not dbenv:
-            dbenv = ctx.dbenv
-        filename = os.path.join( pisi.context.config.db_dir(), dbname + '.bdb')
-        if os.access(os.path.dirname(filename), os.W_OK):
-            flags = 'w'
-        elif os.access(filename, os.R_OK):
-            flags = 'r'
-        else:
-            raise Error(_('Cannot attain read or write access to database %s') % dbname)
-        self.open(filename, dbname, filetype, flags, mode)
-
-    def __del__(self):
-        # superclass does something funky, we don't need that
-        pass
-        
-    def open(self, filename, dbname, filetype, flags=db.DB_CREATE, mode=0644):
-        self.filename = filename        
-        self.closed = False
-        #print 'open', filename
-        if type(flags) == type(''):
-            sflag = flags
-            if sflag == 'r':
-                flags = db.DB_RDONLY
-            elif sflag == 'rw':
-                flags = 0
-            elif sflag == 'w':
-                flags =  db.DB_CREATE
-            elif sflag == 'c':
-                flags =  db.DB_CREATE
-            elif sflag == 'n':
-                flags = db.DB_TRUNCATE | db.DB_CREATE
-            else:
-                raise Error, _("Flags should be one of 'r', 'w', 'c' or 'n' or use the bsddb.db.DB_* flags")
-        self.flags = flags
-        pisi.util.check_dir(pisi.context.config.db_dir())
-        if self.flags != db.DB_RDONLY:
-            self.lock()
-        return self.db.open(filename, dbname, filetype, flags, mode)
-
-    def lock(self):
-        self.lockfile = file(self.filename + '.lock', 'w')
-        try:
-            fcntl.flock(self.lockfile, fcntl.LOCK_EX | fcntl.LOCK_NB)
-        except IOError:
-            raise Error(_("Another instance of PISI is running. Try later!"))
-
-    def close(self):
-        if self.closed:
-            return
-        self.db.close()
-        if self.flags != db.DB_RDONLY:
-            self.unlock()
-        self.closed = True
-
-    def unlock(self):
-        self.lockfile.close()
-        os.unlink(self.filename + '.lock')
-
-    @staticmethod
-    def encodekey(key):
-        '''utility method for dbs that must store unicodes in keys'''
-        if type(key)==types.UnicodeType:
-            return key.encode('utf-8')
-        elif type(key)==types.StringType:
-            return key
-        else:
-            raise Error('Key must be either string or unicode')