view test/test_locking.py @ 6431:ada1edcc9132

issue2551142 - Import ... unique constraint failure. Full title: Import of retired node with username after active node fails with unique constraint failure. Fix this in two ways: 1) sort export on keyname, retired status so that retired nodes for a given keyname are before the acive node in the export file. This stops generating a broken export. 2) handle importing a broken export by deactivating/fixing up/clearing the active record's unique index entry temporarily. Redo the import of the retired node and resetting the active record to active. The fixup changes the unique index (keyvalue, __retired__) from (keyvalue, 0) to (keyvalue, -1). Then it retries the failed import of a retired record with keyvalue. I use -1 in case something goes wrong, It makes the record stand out in the database allowing hand recovery if needed. Rather than using -1 I could just use the id of the record like a normal retirement does. If the retry of the import fails (raises exception), reset the active record from -1 back to 0 and raise the exception. If it succeeds, reset the active record from -1 back to 0 and continue the import process. Reset __retired__ from -1 to 0 on every import. I don't think the performance loss from resetting on every exception matters as there should be very few exceptions. Also this makes the code more understandable. There is no reason to leave the -1 value in place and do a bulk rest of -1 to 0 after the class csv file is loaded. Also if a fixup is needed it is logged at level info with the rest of the database logging. Also success of the fixup is logged. Fixup failure generates a propagated exception.
author John Rouillard <rouilj@ieee.org>
date Mon, 07 Jun 2021 09:58:39 -0400
parents 35ea9b1efc14
children fed0f839c260
line wrap: on
line source

# Copyright (c) 2002 ekit.com Inc (http://www.ekit-inc.com/)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
#   The above copyright notice and this permission notice shall be included in
#   all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

import os, unittest, tempfile

from roundup.backends.locking import acquire_lock, release_lock

class LockingTest(unittest.TestCase):
    def setUp(self):
        self.path = tempfile.mktemp()
        open(self.path, 'w').write('hi\n')

    # XXX test disabled because it simply doesn't work on many platforms
    # (Solaris and Irix are known to fail, but Linux works)
    def xtest_basics(self):
        f = acquire_lock(self.path)
        try:
            acquire_lock(self.path, block=0)
        except:
            pass
        else:
            raise AssertionError('no exception')
        release_lock(f)
        f = acquire_lock(self.path)
        release_lock(f)

    def tearDown(self):
        os.remove(self.path)

# vim: set filetype=python ts=4 sw=4 et si

Roundup Issue Tracker: http://roundup-tracker.org/