212 lines
6.6 KiB
Python
212 lines
6.6 KiB
Python
#
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# Gramps - a GTK+/GNOME based genealogy program
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#
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# Copyright (C) 2007 Donald N. Allingham
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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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Description
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===========
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This module Provides backup and restore functions for a database. The
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backup function saves the data into backup files, while the restore
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function loads the data back into a database.
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You should only restore the data into an empty database.
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Implementation
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==============
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Not all of the database tables need to be backed up, since many are
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automatically generated from the others. The tables that are backed up
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are the primary tables and the metadata table.
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The database consists of a table of "pickled" tuples. Each of the
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primary tables is "walked", and the pickled tuple is extracted, and
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written to the backup file.
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Restoring the data is just as simple. The backup file is parsed an
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entry at a time, and inserted into the associated database table. The
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derived tables are built automatically as the items are entered into
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db.
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"""
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#-------------------------------------------------------------------------
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#
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# load standard python libraries
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#
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#-------------------------------------------------------------------------
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from gettext import gettext as _
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#------------------------------------------------------------------------
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#
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# Gramps libs
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#
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#------------------------------------------------------------------------
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from QuestionDialog import ErrorDialog
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from gen.db.dbdir import FAMILY_TBL, PLACES_TBL, SOURCES_TBL, MEDIA_TBL, \
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EVENTS_TBL, PERSON_TBL, REPO_TBL, NOTE_TBL, META
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#------------------------------------------------------------------------
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#
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# Set up logging
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#
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#------------------------------------------------------------------------
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import logging
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import os
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import cPickle as pickle
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LOG = logging.getLogger(".Backup")
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def backup(database):
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"""
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Exports the database to a set of backup files. These files consist
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of the pickled database tables, one file for each table.
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The heavy lifting is done by the private __do__export function. The
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purpose of this function is to catch any exceptions that occur.
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@param database: database instance to backup
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@type database: GrampsDbDir
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"""
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try:
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__do_export(database)
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except (OSError, IOError), msg:
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ErrorDialog(_("Error saving backup data"), str(msg))
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def __mk_backup_name(database, base):
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"""
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Return the backup name of the database table
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@param database: database instance
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@type database: GrampsDbDir
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@param base: base name of the table
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@type base: str
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"""
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return os.path.join(database.get_save_path(), base + ".gbkp")
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def __mk_tmp_name(database, base):
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"""
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Return the temporary backup name of the database table
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@param database: database instance
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@type database: GrampsDbDir
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@param base: base name of the table
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@type base: str
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"""
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return os.path.join(database.get_save_path(), base + ".gbkp.new")
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def __do_export(database):
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"""
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Loop through each table of the database, saving the pickled data
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a file.
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@param database: database instance to backup
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@type database: GrampsDbDir
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"""
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try:
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for (base, tbl) in __build_tbl_map(database):
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backup_name = __mk_tmp_name(database, base)
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backup_table = open(backup_name, 'wb')
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cursor = tbl.cursor()
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data = cursor.first()
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while data:
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pickle.dump(data, backup_table, 2)
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data = cursor.next()
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cursor.close()
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backup_table.close()
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except (IOError,OSError):
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return
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for (base, tbl) in __build_tbl_map(database):
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new_name = __mk_backup_name(database, base)
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old_name = __mk_tmp_name(database, base)
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if os.path.isfile(new_name):
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os.unlink(new_name)
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os.rename(old_name, new_name)
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def restore(database):
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"""
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Restores the database to a set of backup files. These files consist
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of the pickled database tables, one file for each table.
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The heavy lifting is done by the private __do__restore function. The
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purpose of this function is to catch any exceptions that occur.
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@param database: database instance to restore
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@type database: GrampsDbDir
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"""
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try:
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__do_restore(database)
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except (OSError, IOError), msg:
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ErrorDialog(_("Error restoring backup data"), str(msg))
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def __do_restore(database):
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"""
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Loop through each table of the database, restoring the pickled data
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to the appropriate database file.
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@param database: database instance to backup
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@type database: GrampsDbDir
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"""
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for (base, tbl) in __build_tbl_map(database):
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backup_name = __mk_backup_name(database, base)
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backup_table = open(backup_name, 'rb')
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__load_tbl_txn(database, backup_table, tbl)
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database.rebuild_secondary()
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def __load_tbl_txn(database, backup_table, tbl):
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"""
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Return the temporary backup name of the database table
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@param database: database instance
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@type database: GrampsDbDir
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@param backup_table: file containing the backup data
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@type backup_table: file
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@param tbl: Berkeley db database table
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@type tbl: Berkeley db database table
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"""
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try:
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while True:
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data = pickle.load(backup_table)
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txn = database.env.txn_begin()
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tbl.put(data[0], data[1], txn=txn)
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txn.commit()
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except EOFError:
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backup_table.close()
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def __build_tbl_map(database):
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"""
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Builds a table map of names to database tables.
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@param database: database instance to backup
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@type database: GrampsDbDir
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"""
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return [
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( PERSON_TBL, database.person_map.db),
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( FAMILY_TBL, database.family_map.db),
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( PLACES_TBL, database.place_map.db),
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( SOURCES_TBL, database.source_map.db),
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( REPO_TBL, database.repository_map.db),
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( NOTE_TBL, database.note_map.db),
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( MEDIA_TBL, database.media_map.db),
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( EVENTS_TBL, database.event_map.db),
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( META, database.metadata.db),
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]
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