156cdc8edf
The (account|container|object).ring.gz files contain, among other things, a JSON-encoded dictionary. This change simply makes the JSON serializer sort the keys of that dictionary so that two Python-identical rings will result in two bytewise-identical ring files. Also, to get repeatable compression, we lock down the timestamp in the gzip output stream to a fixed value. (There's a timestamp value in a gzip stream header; by default, gzip.GzipFile sticks time.time() in there.) This only works on Python 2.7; on 2.6, the 'mtime' argument to gzip.GzipFile() is unsupported. Don't worry, serialization still works on 2.6. It just doesn't always produce the same bytes for the same ring. Change-Id: Ide446413d0aeb78536883933fd0caf440b8f54ad
344 lines
14 KiB
Python
344 lines
14 KiB
Python
# Copyright (c) 2010-2012 OpenStack, LLC.
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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
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# 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 array
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import cPickle as pickle
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import os
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import sys
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import unittest
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from gzip import GzipFile
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from shutil import rmtree
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from time import sleep, time
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from swift.common import ring, utils
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class TestRingData(unittest.TestCase):
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def setUp(self):
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self.testdir = os.path.join(os.path.dirname(__file__), 'ring_data')
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rmtree(self.testdir, ignore_errors=1)
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os.mkdir(self.testdir)
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def tearDown(self):
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rmtree(self.testdir, ignore_errors=1)
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def assert_ring_data_equal(self, rd_expected, rd_got):
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self.assertEquals(rd_expected._replica2part2dev_id,
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rd_got._replica2part2dev_id)
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self.assertEquals(rd_expected.devs, rd_got.devs)
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self.assertEquals(rd_expected._part_shift, rd_got._part_shift)
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def test_attrs(self):
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r2p2d = [[0, 1, 0, 1], [0, 1, 0, 1]]
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d = [{'id': 0, 'zone': 0}, {'id': 1, 'zone': 1}]
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s = 30
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rd = ring.RingData(r2p2d, d, s)
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self.assertEquals(rd._replica2part2dev_id, r2p2d)
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self.assertEquals(rd.devs, d)
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self.assertEquals(rd._part_shift, s)
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def test_can_load_pickled_ring_data(self):
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rd = ring.RingData([[0, 1, 0, 1], [0, 1, 0, 1]],
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[{'id': 0, 'zone': 0}, {'id': 1, 'zone': 1}], 30)
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ring_fname = os.path.join(self.testdir, 'foo.ring.gz')
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for p in xrange(pickle.HIGHEST_PROTOCOL):
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pickle.dump(rd, GzipFile(ring_fname, 'wb'), protocol=p)
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ring_data = ring.RingData.load(ring_fname)
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self.assert_ring_data_equal(rd, ring_data)
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def test_roundtrip_serialization(self):
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ring_fname = os.path.join(self.testdir, 'foo.ring.gz')
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rd = ring.RingData(
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[array.array('H', [0, 1, 0, 1]), array.array('H',[0, 1, 0, 1])],
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[{'id': 0, 'zone': 0}, {'id': 1, 'zone': 1}], 30)
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rd.save(ring_fname)
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rd2 = ring.RingData.load(ring_fname)
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self.assert_ring_data_equal(rd, rd2)
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def test_deterministic_serialization(self):
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"""
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Two identical rings should produce identical .gz files on disk.
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Only true on Python 2.7 or greater.
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"""
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if sys.version_info[0] == 2 and sys.version_info[1] < 7:
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return
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os.mkdir(os.path.join(self.testdir, '1'))
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os.mkdir(os.path.join(self.testdir, '2'))
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# These have to have the same filename (not full path,
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# obviously) since the filename gets encoded in the gzip data.
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ring_fname1 = os.path.join(self.testdir, '1', 'the.ring.gz')
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ring_fname2 = os.path.join(self.testdir, '2', 'the.ring.gz')
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rd = ring.RingData(
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[array.array('H', [0, 1, 0, 1]), array.array('H',[0, 1, 0, 1])],
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[{'id': 0, 'zone': 0}, {'id': 1, 'zone': 1}], 30)
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rd.save(ring_fname1)
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rd.save(ring_fname2)
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with open(ring_fname1) as ring1:
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with open(ring_fname2) as ring2:
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self.assertEqual(ring1.read(), ring2.read())
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class TestRing(unittest.TestCase):
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def setUp(self):
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utils.HASH_PATH_SUFFIX = 'endcap'
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self.testdir = os.path.join(os.path.dirname(__file__), 'ring')
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rmtree(self.testdir, ignore_errors=1)
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os.mkdir(self.testdir)
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self.testgz = os.path.join(self.testdir, 'whatever.ring.gz')
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self.intended_replica2part2dev_id = [
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array.array('H', [0, 1, 0, 1]),
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array.array('H', [0, 1, 0, 1]),
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array.array('H', [3, 4, 3, 4])]
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self.intended_devs = [{'id': 0, 'zone': 0, 'weight': 1.0,
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'ip': '10.1.1.1', 'port': 6000},
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{'id': 1, 'zone': 0, 'weight': 1.0,
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'ip': '10.1.1.1', 'port': 6000},
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None,
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{'id': 3, 'zone': 2, 'weight': 1.0,
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'ip': '10.1.2.1', 'port': 6000},
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{'id': 4, 'zone': 2, 'weight': 1.0,
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'ip': '10.1.2.2', 'port': 6000}]
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self.intended_part_shift = 30
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self.intended_reload_time = 15
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ring.RingData(self.intended_replica2part2dev_id,
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self.intended_devs, self.intended_part_shift).save(self.testgz)
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self.ring = ring.Ring(self.testdir,
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reload_time=self.intended_reload_time, ring_name='whatever')
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def tearDown(self):
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rmtree(self.testdir, ignore_errors=1)
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def test_creation(self):
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self.assertEquals(self.ring._replica2part2dev_id,
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self.intended_replica2part2dev_id)
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self.assertEquals(self.ring._part_shift, self.intended_part_shift)
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self.assertEquals(self.ring.devs, self.intended_devs)
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self.assertEquals(self.ring.reload_time, self.intended_reload_time)
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self.assertEquals(self.ring.serialized_path, self.testgz)
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# test invalid endcap
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_orig_hash_path_suffix = utils.HASH_PATH_SUFFIX
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try:
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utils.HASH_PATH_SUFFIX = ''
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self.assertRaises(SystemExit, ring.Ring, self.testdir, 'whatever')
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finally:
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utils.HASH_PATH_SUFFIX = _orig_hash_path_suffix
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def test_has_changed(self):
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self.assertEquals(self.ring.has_changed(), False)
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os.utime(self.testgz, (time() + 60, time() + 60))
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self.assertEquals(self.ring.has_changed(), True)
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def test_reload(self):
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os.utime(self.testgz, (time() - 300, time() - 300))
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self.ring = ring.Ring(self.testdir, reload_time=0.001,
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ring_name='whatever')
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orig_mtime = self.ring._mtime
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self.assertEquals(len(self.ring.devs), 5)
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self.intended_devs.append({'id': 3, 'zone': 3, 'weight': 1.0})
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ring.RingData(self.intended_replica2part2dev_id,
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self.intended_devs, self.intended_part_shift).save(self.testgz)
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sleep(0.1)
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self.ring.get_nodes('a')
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self.assertEquals(len(self.ring.devs), 6)
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self.assertNotEquals(self.ring._mtime, orig_mtime)
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os.utime(self.testgz, (time() - 300, time() - 300))
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self.ring = ring.Ring(self.testdir, reload_time=0.001,
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ring_name='whatever')
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orig_mtime = self.ring._mtime
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self.assertEquals(len(self.ring.devs), 6)
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self.intended_devs.append({'id': 5, 'zone': 4, 'weight': 1.0})
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ring.RingData(self.intended_replica2part2dev_id,
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self.intended_devs, self.intended_part_shift).save(self.testgz)
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sleep(0.1)
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self.ring.get_part_nodes(0)
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self.assertEquals(len(self.ring.devs), 7)
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self.assertNotEquals(self.ring._mtime, orig_mtime)
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os.utime(self.testgz, (time() - 300, time() - 300))
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self.ring = ring.Ring(self.testdir, reload_time=0.001,
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ring_name='whatever')
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orig_mtime = self.ring._mtime
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part, nodes = self.ring.get_nodes('a')
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self.assertEquals(len(self.ring.devs), 7)
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self.intended_devs.append({'id': 6, 'zone': 5, 'weight': 1.0})
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ring.RingData(self.intended_replica2part2dev_id,
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self.intended_devs, self.intended_part_shift).save(self.testgz)
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sleep(0.1)
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self.ring.get_more_nodes(part).next()
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self.assertEquals(len(self.ring.devs), 8)
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self.assertNotEquals(self.ring._mtime, orig_mtime)
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os.utime(self.testgz, (time() - 300, time() - 300))
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self.ring = ring.Ring(self.testdir, reload_time=0.001,
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ring_name='whatever')
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orig_mtime = self.ring._mtime
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self.assertEquals(len(self.ring.devs), 8)
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self.intended_devs.append({'id': 5, 'zone': 4, 'weight': 1.0})
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ring.RingData(self.intended_replica2part2dev_id,
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self.intended_devs, self.intended_part_shift).save(self.testgz)
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sleep(0.1)
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self.assertEquals(len(self.ring.devs), 9)
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self.assertNotEquals(self.ring._mtime, orig_mtime)
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def test_get_part_nodes(self):
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part, nodes = self.ring.get_nodes('a')
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self.assertEquals(nodes, self.ring.get_part_nodes(part))
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def test_get_nodes(self):
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# Yes, these tests are deliberately very fragile. We want to make sure
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# that if someones changes the results the ring produces, they know it.
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self.assertRaises(TypeError, self.ring.get_nodes)
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part, nodes = self.ring.get_nodes('a')
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self.assertEquals(part, 0)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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part, nodes = self.ring.get_nodes('a1')
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self.assertEquals(part, 0)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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part, nodes = self.ring.get_nodes('a4')
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self.assertEquals(part, 1)
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self.assertEquals(nodes, [self.intended_devs[1],
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self.intended_devs[4]])
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part, nodes = self.ring.get_nodes('aa')
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self.assertEquals(part, 1)
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self.assertEquals(nodes, [self.intended_devs[1],
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self.intended_devs[4]])
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part, nodes = self.ring.get_nodes('a', 'c1')
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self.assertEquals(part, 0)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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part, nodes = self.ring.get_nodes('a', 'c0')
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self.assertEquals(part, 3)
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self.assertEquals(nodes, [self.intended_devs[1],
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self.intended_devs[4]])
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part, nodes = self.ring.get_nodes('a', 'c3')
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self.assertEquals(part, 2)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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part, nodes = self.ring.get_nodes('a', 'c2')
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self.assertEquals(part, 2)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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part, nodes = self.ring.get_nodes('a', 'c', 'o1')
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self.assertEquals(part, 1)
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self.assertEquals(nodes, [self.intended_devs[1],
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self.intended_devs[4]])
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part, nodes = self.ring.get_nodes('a', 'c', 'o5')
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self.assertEquals(part, 0)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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part, nodes = self.ring.get_nodes('a', 'c', 'o0')
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self.assertEquals(part, 0)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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part, nodes = self.ring.get_nodes('a', 'c', 'o2')
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self.assertEquals(part, 2)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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def add_dev_to_ring(self, new_dev):
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self.ring.devs.append(new_dev)
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self.ring._rebuild_tier_data()
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def test_get_more_nodes(self):
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# Yes, these tests are deliberately very fragile. We want to make sure
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# that if someone changes the results the ring produces, they know it.
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part, nodes = self.ring.get_nodes('a', 'c', 'o2')
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self.assertEquals(part, 2)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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nodes = list(self.ring.get_more_nodes(part))
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self.assertEquals(nodes, [self.intended_devs[4],
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self.intended_devs[1]])
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new_dev = {'id': 5, 'zone': 0, 'weight': 1.0,
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'ip': '10.1.1.1', 'port': 6000}
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self.add_dev_to_ring(new_dev)
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part, nodes = self.ring.get_nodes('a', 'c', 'o2')
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self.assertEquals(part, 2)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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nodes = list(self.ring.get_more_nodes(part))
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self.assertEquals(nodes, [self.intended_devs[4],
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new_dev,
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self.intended_devs[1]])
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self.ring.devs[5]['zone'] = 3
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self.ring._rebuild_tier_data()
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part, nodes = self.ring.get_nodes('a', 'c', 'o2')
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self.assertEquals(part, 2)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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nodes = list(self.ring.get_more_nodes(part))
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self.assertEquals(nodes, [new_dev,
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self.intended_devs[4],
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self.intended_devs[1]])
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self.ring.devs.append(None)
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new_dev2 = {'id': 6, 'zone': 6, 'weight': 1.0,
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'ip': '10.1.6.1', 'port': 6000}
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self.add_dev_to_ring(new_dev2)
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part, nodes = self.ring.get_nodes('a', 'c', 'o2')
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self.assertEquals(part, 2)
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self.assertEquals(nodes, [self.intended_devs[0],
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self.intended_devs[3]])
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nodes = list(self.ring.get_more_nodes(part))
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self.assertEquals(nodes, [new_dev,
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new_dev2,
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self.intended_devs[4],
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self.intended_devs[1]])
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new_dev3 = {'id': 7, 'zone': 7, 'weight': 1.0,
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'ip': '10.1.7.1', 'port': 6000}
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self.add_dev_to_ring(new_dev3)
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nodes = list(self.ring.get_more_nodes(part))
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self.assertEquals(nodes, [new_dev, new_dev2, new_dev3,
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self.intended_devs[4],
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self.intended_devs[1]])
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new_dev3['weight'] = 0
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nodes = list(self.ring.get_more_nodes(part))
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self.assertEquals(nodes, [new_dev, new_dev2,
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self.intended_devs[4],
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self.intended_devs[1]])
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self.ring.devs[7]['weight'] = 1.0
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new_dev4 = {'id': 8, 'zone': 8, 'weight': 0.0,
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'ip': '10.1.8.1', 'port': 6000}
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self.add_dev_to_ring(new_dev4)
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nodes = list(self.ring.get_more_nodes(part))
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self.assertEquals(nodes, [new_dev, new_dev2,
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self.intended_devs[4],
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self.intended_devs[1]])
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if __name__ == '__main__':
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unittest.main()
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