/brz/remove-bazaar

# groupcompress, a bzr plugin providing new compression logic.

# Copyright (C) 2008 Canonical Limited.

# 

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License version 2 as published

# by the Free Software Foundation.

# 

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# 

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA

# 

"""Tests for group compression."""

import zlib

from bzrlib import tests

from bzrlib.osutils import sha_string

from bzrlib.plugins.groupcompress import errors, groupcompress

from bzrlib.tests import (

    TestCaseWithTransport,

    TestScenarioApplier,

    adapt_tests,

    )

from bzrlib.transport import get_transport

def load_tests(standard_tests, module, loader):

    from bzrlib.tests.test_versionedfile import TestVersionedFiles

    vf_interface_tests = loader.loadTestsFromTestCase(TestVersionedFiles)

    cleanup_pack_group = groupcompress.cleanup_pack_group

    make_pack_factory = groupcompress.make_pack_factory

    group_scenario = ('groupcompressrabin-nograph', {

            'cleanup':cleanup_pack_group,

            'factory':make_pack_factory(False, False, 1),

            'graph': False,

            'key_length':1,

            'support_partial_insertion':False,

            }

        )

    applier = TestScenarioApplier()

    applier.scenarios = [group_scenario]

    adapt_tests(vf_interface_tests, applier, standard_tests)

    return standard_tests

class TestGroupCompressor(tests.TestCase):

    """Tests for GroupCompressor"""

    def test_empty_delta(self):

        compressor = groupcompress.GroupCompressor(True)

        self.assertEqual([], compressor.lines)

    def test_one_nosha_delta(self):

        # diff against NUKK

        compressor = groupcompress.GroupCompressor(True)

        sha1, end_point = compressor.compress(('label',),

            'strange\ncommon\n', None)

        self.assertEqual(sha_string('strange\ncommon\n'), sha1)

        expected_lines = [

            'strange\ncommon\n',

            ]

        self.assertEqual(expected_lines, compressor.lines)

        self.assertEqual(sum(map(len, expected_lines)), end_point)

    def _chunks_to_repr_lines(self, chunks):

        return '\n'.join(map(repr, ''.join(chunks).split('\n')))

    def assertEqualDiffEncoded(self, expected, actual):

        """Compare the actual content to the expected content.

        :param expected: A group of chunks that we expect to see

        :param actual: The measured 'chunks'

        We will transform the chunks back into lines, and then run 'repr()'

        over them to handle non-ascii characters.

        """

        self.assertEqualDiff(self._chunks_to_repr_lines(expected),

                             self._chunks_to_repr_lines(actual))

    def test_two_nosha_delta(self):

        compressor = groupcompress.GroupCompressor(True)

        sha1_1, _ = compressor.compress(('label',),

            'strange\ncommon long line\nthat needs a 16 byte match\n', None)

        expected_lines = list(compressor.lines)

        sha1_2, end_point = compressor.compress(('newlabel',),

            'common long line\nthat needs a 16 byte match\ndifferent\n', None)

        self.assertEqual(sha_string('common long line\n'

                                    'that needs a 16 byte match\n'

                                    'different\n'), sha1_2)

        expected_lines.extend([

            # source and target length

            '\x34\x36',

            # copy the line common

            '\x91\x08\x2c', #copy, offset 0x08, len 0x2c

            # add the line different, and the trailing newline

            '\x0adifferent\n', # insert 10 bytes

            ])

        self.assertEqualDiffEncoded(expected_lines, compressor.lines)

        self.assertEqual(sum(map(len, expected_lines)), end_point)

    def test_three_nosha_delta(self):

        # The first interesting test: make a change that should use lines from

        # both parents.

        compressor = groupcompress.GroupCompressor(True)

        sha1_1, end_point = compressor.compress(('label',),

            'strange\ncommon very very long line\nwith some extra text\n', None)

        sha1_2, _ = compressor.compress(('newlabel',),

            'different\nmoredifferent\nand then some more\n', None)

        expected_lines = list(compressor.lines)

        sha1_3, end_point = compressor.compress(('label3',),

            'new\ncommon very very long line\nwith some extra text\n'

            'different\nmoredifferent\nand then some more\n',

            None)

        self.assertEqual(

            sha_string('new\ncommon very very long line\nwith some extra text\n'

                       'different\nmoredifferent\nand then some more\n'),

            sha1_3)

        expected_lines.extend([

            '\x63\x5f' # source and target length

            # insert new

            '\x03new',

            # Copy of first parent 'common' range

            '\x91\x07\x31' # copy, offset 0x07, 0x31 bytes

            # Copy of second parent 'different' range

            '\x91\x38\x2b' # copy, offset 0x38, 0x2b bytes

            ])

        self.assertEqualDiffEncoded(expected_lines, compressor.lines)

        self.assertEqual(sum(map(len, expected_lines)), end_point)

    def test_stats(self):

        compressor = groupcompress.GroupCompressor(True)

        compressor.compress(('label',), 'strange\ncommon long line\n'

                                        'plus more text\n', None)

        compressor.compress(('newlabel',),

                            'common long line\nplus more text\n'

                            'different\nmoredifferent\n', None)

        compressor.compress(('label3',),

                            'new\ncommon long line\nplus more text\n'

                            '\ndifferent\nmoredifferent\n', None)

        self.assertAlmostEqual(1.4, compressor.ratio(), 1)

    def test_extract_from_compressor(self):

        # Knit fetching will try to reconstruct texts locally which results in

        # reading something that is in the compressor stream already.

        compressor = groupcompress.GroupCompressor(True)

        sha1_1, _ = compressor.compress(('label',),

            'strange\ncommon long line\nthat needs a 16 byte match\n', None)

        expected_lines = list(compressor.lines)

        sha1_2, end_point = compressor.compress(('newlabel',),

            'common long line\nthat needs a 16 byte match\ndifferent\n', None)

        # get the first out

        self.assertEqual(('strange\ncommon long line\n'

                          'that needs a 16 byte match\n', sha1_1),

            compressor.extract(('label',)))

        # and the second

        self.assertEqual(('common long line\nthat needs a 16 byte match\n'

                          'different\n', sha1_2),

                         compressor.extract(('newlabel',)))

class TestBase128Int(tests.TestCase):

    def assertEqualEncode(self, bytes, val):

        self.assertEqual(bytes, groupcompress.encode_base128_int(val))

    def assertEqualDecode(self, val, num_decode, bytes):

        self.assertEqual((val, num_decode),

                         groupcompress.decode_base128_int(bytes))

    def test_encode(self):

        self.assertEqualEncode('\x01', 1)

        self.assertEqualEncode('\x02', 2)

        self.assertEqualEncode('\x7f', 127)

        self.assertEqualEncode('\x80\x01', 128)

        self.assertEqualEncode('\xff\x01', 255)

        self.assertEqualEncode('\x80\x02', 256)

        self.assertEqualEncode('\xff\xff\xff\xff\x0f', 0xFFFFFFFF)

    def test_decode(self):

        self.assertEqualDecode(1, 1, '\x01')

        self.assertEqualDecode(2, 1, '\x02')

        self.assertEqualDecode(127, 1, '\x7f')

        self.assertEqualDecode(128, 2, '\x80\x01')

        self.assertEqualDecode(255, 2, '\xff\x01')

        self.assertEqualDecode(256, 2, '\x80\x02')

        self.assertEqualDecode(0xFFFFFFFF, 5, '\xff\xff\xff\xff\x0f')

    def test_decode_with_trailing_bytes(self):

        self.assertEqualDecode(1, 1, '\x01abcdef')

        self.assertEqualDecode(127, 1, '\x7f\x01')

        self.assertEqualDecode(128, 2, '\x80\x01abcdef')

        self.assertEqualDecode(255, 2, '\xff\x01\xff')

class TestGroupCompressBlock(tests.TestCase):

    def test_from_empty_bytes(self):

        self.assertRaises(errors.InvalidGroupCompressBlock,

                          groupcompress.GroupCompressBlock.from_bytes, '')

    def test_from_minimal_bytes(self):

        block = groupcompress.GroupCompressBlock.from_bytes('gcb1z\n0\n0\n')

        self.assertIsInstance(block, groupcompress.GroupCompressBlock)

        self.assertEqual({}, block._entries)

    def test_from_bytes(self):

        z_header_bytes = (

            'gcb1z\n' # group compress block v1 plain

            '76\n' # Length of zlib bytes

            '183\n' # Length of all meta-info

            + zlib.compress(

            'key:bing\n'

            'sha1:abcdabcdabcdabcdabcdabcdabcdabcdabcdabcd\n'

            'type:fulltext\n'

            'start:100\n'

            'length:100\n'

            '\n'

            'key:foo\x00bar\n'

            'sha1:abcdabcdabcdabcdabcdabcdabcdabcdabcdabcd\n'

            'type:fulltext\n'

            'start:0\n'

            'length:100\n'

            '\n'))

        block = groupcompress.GroupCompressBlock.from_bytes(

            z_header_bytes)

        self.assertIs(None, block._content)

        self.assertIsInstance(block, groupcompress.GroupCompressBlock)

        self.assertEqual([('bing',), ('foo', 'bar')], sorted(block._entries))

        bing = block._entries[('bing',)]

        self.assertEqual(('bing',), bing.key)

        self.assertEqual('fulltext', bing.type)

        self.assertEqual('abcd'*10, bing.sha1)

        self.assertEqual(100, bing.start)

        self.assertEqual(100, bing.length)

        foobar = block._entries[('foo', 'bar')]

        self.assertEqual(('foo', 'bar'), foobar.key)

        self.assertEqual('fulltext', foobar.type)

        self.assertEqual('abcd'*10, foobar.sha1)

        self.assertEqual(0, foobar.start)

        self.assertEqual(100, foobar.length)

    def test_add_entry(self):

        gcb = groupcompress.GroupCompressBlock()

        e = gcb.add_entry(('foo', 'bar'), 'fulltext', 'abcd'*10, 0, 100)

        self.assertIsInstance(e, groupcompress.GroupCompressBlockEntry)

        self.assertEqual(('foo', 'bar'), e.key)

        self.assertEqual('fulltext', e.type)

        self.assertEqual('abcd'*10, e.sha1)

        self.assertEqual(0, e.start)

        self.assertEqual(100, e.length)

    def test_to_bytes(self):

        gcb = groupcompress.GroupCompressBlock()

        gcb.add_entry(('foo', 'bar'), 'fulltext', 'abcd'*10, 0, 100)

        gcb.add_entry(('bing',), 'fulltext', 'abcd'*10, 100, 100)

        bytes = gcb.to_bytes()

        self.assertStartsWith(bytes,

                              'gcb1z\n' # group compress block v1 zlib

                              '77\n' # Length of compressed bytes

                              '183\n' # Length of all meta-info

                             )

        remaining_bytes = bytes[13:]

        raw_bytes = zlib.decompress(remaining_bytes)

        self.assertEqualDiff('key:bing\n'

                             'sha1:abcdabcdabcdabcdabcdabcdabcdabcdabcdabcd\n'

                             'type:fulltext\n'

                             'start:100\n'

                             'length:100\n'

                             '\n'

                             'key:foo\x00bar\n'

                             'sha1:abcdabcdabcdabcdabcdabcdabcdabcdabcdabcd\n'

                             'type:fulltext\n'

                             'start:0\n'

                             'length:100\n'

                             '\n', raw_bytes)