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# Copyright (C) 2005, 2006, 2007 Canonical Ltd
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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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# 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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# 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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"""Knit versionedfile implementation.
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A knit is a versioned file implementation that supports efficient append only
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lifeless: the data file is made up of "delta records". each delta record has a delta header
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that contains; (1) a version id, (2) the size of the delta (in lines), and (3) the digest of
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the -expanded data- (ie, the delta applied to the parent). the delta also ends with a
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end-marker; simply "end VERSION"
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delta can be line or full contents.a
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... the 8's there are the index number of the annotation.
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version robertc@robertcollins.net-20051003014215-ee2990904cc4c7ad 7 c7d23b2a5bd6ca00e8e266cec0ec228158ee9f9e
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8 e.set('executable', 'yes')
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8 if elt.get('executable') == 'yes':
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8 ie.executable = True
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end robertc@robertcollins.net-20051003014215-ee2990904cc4c7ad
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09:33 < jrydberg> lifeless: each index is made up of a tuple of; version id, options, position, size, parents
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09:33 < jrydberg> lifeless: the parents are currently dictionary compressed
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09:33 < jrydberg> lifeless: (meaning it currently does not support ghosts)
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09:33 < lifeless> right
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09:33 < jrydberg> lifeless: the position and size is the range in the data file
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so the index sequence is the dictionary compressed sequence number used
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in the deltas to provide line annotation
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# 10:16 < lifeless> make partial index writes safe
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# 10:16 < lifeless> implement 'knit.check()' like weave.check()
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# 10:17 < lifeless> record known ghosts so we can detect when they are filled in rather than the current 'reweave
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# move sha1 out of the content so that join is faster at verifying parents
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# record content length ?
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from cStringIO import StringIO
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from itertools import izip, chain
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from bzrlib.errors import (
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RevisionAlreadyPresent,
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from bzrlib.tuned_gzip import GzipFile
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from bzrlib.trace import mutter
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from bzrlib.osutils import (
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from bzrlib.symbol_versioning import DEPRECATED_PARAMETER, deprecated_passed
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from bzrlib.tsort import topo_sort
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from bzrlib.versionedfile import VersionedFile, InterVersionedFile
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# TODO: Split out code specific to this format into an associated object.
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# TODO: Can we put in some kind of value to check that the index and data
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# files belong together?
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# TODO: accommodate binaries, perhaps by storing a byte count
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# TODO: function to check whole file
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# TODO: atomically append data, then measure backwards from the cursor
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# position after writing to work out where it was located. we may need to
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# bypass python file buffering.
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DATA_SUFFIX = '.knit'
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INDEX_SUFFIX = '.kndx'
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class KnitContent(object):
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"""Content of a knit version to which deltas can be applied."""
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def __init__(self, lines):
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def annotate_iter(self):
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"""Yield tuples of (origin, text) for each content line."""
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return iter(self._lines)
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"""Return a list of (origin, text) tuples."""
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return list(self.annotate_iter())
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def line_delta_iter(self, new_lines):
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"""Generate line-based delta from this content to new_lines."""
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new_texts = new_lines.text()
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old_texts = self.text()
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s = KnitSequenceMatcher(None, old_texts, new_texts)
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for tag, i1, i2, j1, j2 in s.get_opcodes():
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# ofrom, oto, length, data
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yield i1, i2, j2 - j1, new_lines._lines[j1:j2]
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def line_delta(self, new_lines):
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return list(self.line_delta_iter(new_lines))
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return [text for origin, text in self._lines]
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return KnitContent(self._lines[:])
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def get_line_delta_blocks(knit_delta, source, target):
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"""Extract SequenceMatcher.get_matching_blocks() from a knit delta"""
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target_len = len(target)
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for s_begin, s_end, t_len, new_text in knit_delta:
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true_n = s_begin - s_pos
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# knit deltas do not provide reliable info about whether the
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# last line of a file matches, due to eol handling.
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if source[s_pos + n -1] != target[t_pos + n -1]:
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yield s_pos, t_pos, n
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t_pos += t_len + true_n
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n = target_len - t_pos
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if source[s_pos + n -1] != target[t_pos + n -1]:
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yield s_pos, t_pos, n
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yield s_pos + (target_len - t_pos), target_len, 0
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class _KnitFactory(object):
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"""Base factory for creating content objects."""
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def make(self, lines, version_id):
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num_lines = len(lines)
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return KnitContent(zip([version_id] * num_lines, lines))
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class KnitAnnotateFactory(_KnitFactory):
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"""Factory for creating annotated Content objects."""
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def parse_fulltext(self, content, version_id):
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"""Convert fulltext to internal representation
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fulltext content is of the format
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revid(utf8) plaintext\n
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internal representation is of the format:
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# TODO: jam 20070209 The tests expect this to be returned as tuples,
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# but the code itself doesn't really depend on that.
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# Figure out a way to not require the overhead of turning the
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# list back into tuples.
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lines = [tuple(line.split(' ', 1)) for line in content]
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return KnitContent(lines)
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def parse_line_delta_iter(self, lines):
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return iter(self.parse_line_delta(lines))
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def parse_line_delta(self, lines, version_id):
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"""Convert a line based delta into internal representation.
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line delta is in the form of:
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intstart intend intcount
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revid(utf8) newline\n
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internal representation is
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(start, end, count, [1..count tuples (revid, newline)])
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def cache_and_return(line):
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origin, text = line.split(' ', 1)
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return cache.setdefault(origin, origin), text
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# walk through the lines parsing.
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start, end, count = [int(n) for n in header.split(',')]
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contents = [tuple(next().split(' ', 1)) for i in xrange(count)]
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result.append((start, end, count, contents))
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def get_fulltext_content(self, lines):
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"""Extract just the content lines from a fulltext."""
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return (line.split(' ', 1)[1] for line in lines)
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def get_linedelta_content(self, lines):
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"""Extract just the content from a line delta.
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This doesn't return all of the extra information stored in a delta.
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Only the actual content lines.
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header = header.split(',')
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count = int(header[2])
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for i in xrange(count):
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origin, text = next().split(' ', 1)
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def lower_fulltext(self, content):
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"""convert a fulltext content record into a serializable form.
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see parse_fulltext which this inverts.
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# TODO: jam 20070209 We only do the caching thing to make sure that
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# the origin is a valid utf-8 line, eventually we could remove it
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return ['%s %s' % (o, t) for o, t in content._lines]
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def lower_line_delta(self, delta):
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"""convert a delta into a serializable form.
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See parse_line_delta which this inverts.
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# TODO: jam 20070209 We only do the caching thing to make sure that
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# the origin is a valid utf-8 line, eventually we could remove it
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for start, end, c, lines in delta:
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out.append('%d,%d,%d\n' % (start, end, c))
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out.extend(origin + ' ' + text
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for origin, text in lines)
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class KnitPlainFactory(_KnitFactory):
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"""Factory for creating plain Content objects."""
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def parse_fulltext(self, content, version_id):
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"""This parses an unannotated fulltext.
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Note that this is not a noop - the internal representation
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has (versionid, line) - its just a constant versionid.
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return self.make(content, version_id)
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def parse_line_delta_iter(self, lines, version_id):
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num_lines = len(lines)
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while cur < num_lines:
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start, end, c = [int(n) for n in header.split(',')]
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yield start, end, c, zip([version_id] * c, lines[cur:cur+c])
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def parse_line_delta(self, lines, version_id):
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return list(self.parse_line_delta_iter(lines, version_id))
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def get_fulltext_content(self, lines):
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"""Extract just the content lines from a fulltext."""
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def get_linedelta_content(self, lines):
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"""Extract just the content from a line delta.
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This doesn't return all of the extra information stored in a delta.
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Only the actual content lines.
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header = header.split(',')
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count = int(header[2])
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for i in xrange(count):
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def lower_fulltext(self, content):
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return content.text()
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def lower_line_delta(self, delta):
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for start, end, c, lines in delta:
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out.append('%d,%d,%d\n' % (start, end, c))
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out.extend([text for origin, text in lines])
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def make_empty_knit(transport, relpath):
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"""Construct a empty knit at the specified location."""
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k = KnitVersionedFile(transport, relpath, 'w', KnitPlainFactory)
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class KnitVersionedFile(VersionedFile):
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"""Weave-like structure with faster random access.
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A knit stores a number of texts and a summary of the relationships
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between them. Texts are identified by a string version-id. Texts
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are normally stored and retrieved as a series of lines, but can
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also be passed as single strings.
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Lines are stored with the trailing newline (if any) included, to
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avoid special cases for files with no final newline. Lines are
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composed of 8-bit characters, not unicode. The combination of
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these approaches should mean any 'binary' file can be safely
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stored and retrieved.
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def __init__(self, relpath, transport, file_mode=None, access_mode=None,
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factory=None, basis_knit=DEPRECATED_PARAMETER, delta=True,
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create=False, create_parent_dir=False, delay_create=False,
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"""Construct a knit at location specified by relpath.
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:param create: If not True, only open an existing knit.
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:param create_parent_dir: If True, create the parent directory if
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creating the file fails. (This is used for stores with
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hash-prefixes that may not exist yet)
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:param delay_create: The calling code is aware that the knit won't
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actually be created until the first data is stored.
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if deprecated_passed(basis_knit):
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warnings.warn("KnitVersionedFile.__(): The basis_knit parameter is"
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" deprecated as of bzr 0.9.",
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DeprecationWarning, stacklevel=2)
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if access_mode is None:
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super(KnitVersionedFile, self).__init__(access_mode)
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assert access_mode in ('r', 'w'), "invalid mode specified %r" % access_mode
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self.transport = transport
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self.filename = relpath
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self.factory = factory or KnitAnnotateFactory()
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self.writable = (access_mode == 'w')
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self._max_delta_chain = 200
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self._index = _KnitIndex(transport, relpath + INDEX_SUFFIX,
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access_mode, create=create, file_mode=file_mode,
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create_parent_dir=create_parent_dir, delay_create=delay_create,
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self._data = _KnitData(transport, relpath + DATA_SUFFIX,
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access_mode, create=create and not len(self), file_mode=file_mode,
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create_parent_dir=create_parent_dir, delay_create=delay_create,
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return '%s(%s)' % (self.__class__.__name__,
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self.transport.abspath(self.filename))
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def _check_should_delta(self, first_parents):
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"""Iterate back through the parent listing, looking for a fulltext.
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This is used when we want to decide whether to add a delta or a new
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fulltext. It searches for _max_delta_chain parents. When it finds a
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fulltext parent, it sees if the total size of the deltas leading up to
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it is large enough to indicate that we want a new full text anyway.
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Return True if we should create a new delta, False if we should use a
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delta_parents = first_parents
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for count in xrange(self._max_delta_chain):
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parent = delta_parents[0]
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method = self._index.get_method(parent)
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pos, size = self._index.get_position(parent)
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if method == 'fulltext':
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delta_parents = self._index.get_parents(parent)
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# We couldn't find a fulltext, so we must create a new one
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return fulltext_size > delta_size
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def _add_delta(self, version_id, parents, delta_parent, sha1, noeol, delta):
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"""See VersionedFile._add_delta()."""
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self._check_add(version_id, []) # should we check the lines ?
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self._check_versions_present(parents)
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for parent in parents:
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if not self.has_version(parent):
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ghosts.append(parent)
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present_parents.append(parent)
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if delta_parent is None:
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# reconstitute as full text.
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assert len(delta) == 1 or len(delta) == 0
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assert delta[0][0] == 0
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assert delta[0][1] == 0, delta[0][1]
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return super(KnitVersionedFile, self)._add_delta(version_id,
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options.append('no-eol')
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if delta_parent is not None:
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# determine the current delta chain length.
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# To speed the extract of texts the delta chain is limited
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# to a fixed number of deltas. This should minimize both
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# I/O and the time spend applying deltas.
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# The window was changed to a maximum of 200 deltas, but also added
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# was a check that the total compressed size of the deltas is
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# smaller than the compressed size of the fulltext.
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if not self._check_should_delta([delta_parent]):
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# We don't want a delta here, just do a normal insertion.
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return super(KnitVersionedFile, self)._add_delta(version_id,
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options.append('line-delta')
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store_lines = self.factory.lower_line_delta(delta)
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where, size = self._data.add_record(version_id, digest, store_lines)
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self._index.add_version(version_id, options, where, size, parents)
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def _add_raw_records(self, records, data):
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"""Add all the records 'records' with data pre-joined in 'data'.
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:param records: A list of tuples(version_id, options, parents, size).
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:param data: The data for the records. When it is written, the records
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are adjusted to have pos pointing into data by the sum of
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the preceding records sizes.
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pos = self._data.add_raw_record(data)
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for (version_id, options, parents, size) in records:
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index_entries.append((version_id, options, pos+offset,
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if self._data._do_cache:
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self._data._cache[version_id] = data[offset:offset+size]
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self._index.add_versions(index_entries)
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def enable_cache(self):
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"""Start caching data for this knit"""
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self._data.enable_cache()
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def clear_cache(self):
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"""Clear the data cache only."""
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self._data.clear_cache()
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def copy_to(self, name, transport):
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"""See VersionedFile.copy_to()."""
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# copy the current index to a temp index to avoid racing with local
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transport.put_file_non_atomic(name + INDEX_SUFFIX + '.tmp',
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self.transport.get(self._index._filename))
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f = self._data._open_file()
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transport.put_file(name + DATA_SUFFIX, f)
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# move the copied index into place
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transport.move(name + INDEX_SUFFIX + '.tmp', name + INDEX_SUFFIX)
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def create_empty(self, name, transport, mode=None):
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return KnitVersionedFile(name, transport, factory=self.factory,
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delta=self.delta, create=True)
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def _fix_parents(self, version_id, new_parents):
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"""Fix the parents list for version.
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This is done by appending a new version to the index
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with identical data except for the parents list.
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the parents list must be a superset of the current
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current_values = self._index._cache[version_id]
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assert set(current_values[4]).difference(set(new_parents)) == set()
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self._index.add_version(version_id,
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def _extract_blocks(self, version_id, source, target):
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if self._index.get_method(version_id) != 'line-delta':
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parent, sha1, noeol, delta = self.get_delta(version_id)
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return KnitContent.get_line_delta_blocks(delta, source, target)
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def get_delta(self, version_id):
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"""Get a delta for constructing version from some other version."""
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version_id = osutils.safe_revision_id(version_id)
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self.check_not_reserved_id(version_id)
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if not self.has_version(version_id):
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raise RevisionNotPresent(version_id, self.filename)
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parents = self.get_parents(version_id)
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data_pos, data_size = self._index.get_position(version_id)
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data, sha1 = self._data.read_records(((version_id, data_pos, data_size),))[version_id]
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noeol = 'no-eol' in self._index.get_options(version_id)
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if 'fulltext' == self._index.get_method(version_id):
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new_content = self.factory.parse_fulltext(data, version_id)
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if parent is not None:
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reference_content = self._get_content(parent)
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old_texts = reference_content.text()
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new_texts = new_content.text()
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delta_seq = KnitSequenceMatcher(None, old_texts, new_texts)
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return parent, sha1, noeol, self._make_line_delta(delta_seq, new_content)
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delta = self.factory.parse_line_delta(data, version_id)
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return parent, sha1, noeol, delta
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def get_graph_with_ghosts(self):
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"""See VersionedFile.get_graph_with_ghosts()."""
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graph_items = self._index.get_graph()
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return dict(graph_items)
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def get_sha1(self, version_id):
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return self.get_sha1s([version_id])[0]
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def get_sha1s(self, version_ids):
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"""See VersionedFile.get_sha1()."""
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version_ids = [osutils.safe_revision_id(v) for v in version_ids]
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record_map = self._get_record_map(version_ids)
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# record entry 2 is the 'digest'.
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return [record_map[v][2] for v in version_ids]
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"""See VersionedFile.get_suffixes()."""
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return [DATA_SUFFIX, INDEX_SUFFIX]
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def has_ghost(self, version_id):
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"""True if there is a ghost reference in the file to version_id."""
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version_id = osutils.safe_revision_id(version_id)
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if self.has_version(version_id):
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# optimisable if needed by memoising the _ghosts set.
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items = self._index.get_graph()
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for node, parents in items:
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for parent in parents:
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if parent not in self._index._cache:
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if parent == version_id:
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"""See VersionedFile.versions."""
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return self._index.get_versions()
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def has_version(self, version_id):
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"""See VersionedFile.has_version."""
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version_id = osutils.safe_revision_id(version_id)
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return self._index.has_version(version_id)
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__contains__ = has_version
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def _merge_annotations(self, content, parents, parent_texts={},
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delta=None, annotated=None):
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"""Merge annotations for content. This is done by comparing
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the annotations based on changed to the text.
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for parent_id in parents:
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merge_content = self._get_content(parent_id, parent_texts)
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seq = patiencediff.PatienceSequenceMatcher(
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None, merge_content.text(), content.text())
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if delta_seq is None:
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# setup a delta seq to reuse.
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for i, j, n in seq.get_matching_blocks():
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# this appears to copy (origin, text) pairs across to the new
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# content for any line that matches the last-checked parent.
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# FIXME: save the sequence control data for delta compression
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# against the most relevant parent rather than rediffing.
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content._lines[j:j+n] = merge_content._lines[i:i+n]
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reference_content = self._get_content(parents[0], parent_texts)
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new_texts = content.text()
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old_texts = reference_content.text()
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delta_seq = patiencediff.PatienceSequenceMatcher(
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None, old_texts, new_texts)
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return self._make_line_delta(delta_seq, content)
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def _make_line_delta(self, delta_seq, new_content):
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"""Generate a line delta from delta_seq and new_content."""
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for op in delta_seq.get_opcodes():
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diff_hunks.append((op[1], op[2], op[4]-op[3], new_content._lines[op[3]:op[4]]))
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def _get_components_positions(self, version_ids):
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"""Produce a map of position data for the components of versions.
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This data is intended to be used for retrieving the knit records.
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A dict of version_id to (method, data_pos, data_size, next) is
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method is the way referenced data should be applied.
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data_pos is the position of the data in the knit.
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data_size is the size of the data in the knit.
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next is the build-parent of the version, or None for fulltexts.
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for version_id in version_ids:
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while cursor is not None and cursor not in component_data:
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method = self._index.get_method(cursor)
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if method == 'fulltext':
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next = self.get_parents(cursor)[0]
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data_pos, data_size = self._index.get_position(cursor)
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component_data[cursor] = (method, data_pos, data_size, next)
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return component_data
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def _get_content(self, version_id, parent_texts={}):
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"""Returns a content object that makes up the specified
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if not self.has_version(version_id):
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raise RevisionNotPresent(version_id, self.filename)
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cached_version = parent_texts.get(version_id, None)
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if cached_version is not None:
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return cached_version
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text_map, contents_map = self._get_content_maps([version_id])
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return contents_map[version_id]
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def _check_versions_present(self, version_ids):
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"""Check that all specified versions are present."""
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self._index.check_versions_present(version_ids)
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def _add_lines_with_ghosts(self, version_id, parents, lines, parent_texts):
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"""See VersionedFile.add_lines_with_ghosts()."""
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self._check_add(version_id, lines)
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return self._add(version_id, lines[:], parents, self.delta, parent_texts)
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def _add_lines(self, version_id, parents, lines, parent_texts):
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"""See VersionedFile.add_lines."""
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self._check_add(version_id, lines)
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self._check_versions_present(parents)
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return self._add(version_id, lines[:], parents, self.delta, parent_texts)
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def _check_add(self, version_id, lines):
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"""check that version_id and lines are safe to add."""
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assert self.writable, "knit is not opened for write"
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### FIXME escape. RBC 20060228
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if contains_whitespace(version_id):
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raise InvalidRevisionId(version_id, self.filename)
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self.check_not_reserved_id(version_id)
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if self.has_version(version_id):
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raise RevisionAlreadyPresent(version_id, self.filename)
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self._check_lines_not_unicode(lines)
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self._check_lines_are_lines(lines)
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def _add(self, version_id, lines, parents, delta, parent_texts):
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"""Add a set of lines on top of version specified by parents.
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If delta is true, compress the text as a line-delta against
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Any versions not present will be converted into ghosts.
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# 461 0 6546.0390 43.9100 bzrlib.knit:489(_add)
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# +400 0 889.4890 418.9790 +bzrlib.knit:192(lower_fulltext)
746
# +461 0 1364.8070 108.8030 +bzrlib.knit:996(add_record)
747
# +461 0 193.3940 41.5720 +bzrlib.knit:898(add_version)
748
# +461 0 134.0590 18.3810 +bzrlib.osutils:361(sha_strings)
749
# +461 0 36.3420 15.4540 +bzrlib.knit:146(make)
750
# +1383 0 8.0370 8.0370 +<len>
751
# +61 0 13.5770 7.9190 +bzrlib.knit:199(lower_line_delta)
752
# +61 0 963.3470 7.8740 +bzrlib.knit:427(_get_content)
753
# +61 0 973.9950 5.2950 +bzrlib.knit:136(line_delta)
754
# +61 0 1918.1800 5.2640 +bzrlib.knit:359(_merge_annotations)
758
if parent_texts is None:
760
for parent in parents:
761
if not self.has_version(parent):
762
ghosts.append(parent)
764
present_parents.append(parent)
766
if delta and not len(present_parents):
769
digest = sha_strings(lines)
772
if lines[-1][-1] != '\n':
773
options.append('no-eol')
774
lines[-1] = lines[-1] + '\n'
776
if len(present_parents) and delta:
777
# To speed the extract of texts the delta chain is limited
778
# to a fixed number of deltas. This should minimize both
779
# I/O and the time spend applying deltas.
780
delta = self._check_should_delta(present_parents)
782
assert isinstance(version_id, str)
783
lines = self.factory.make(lines, version_id)
784
if delta or (self.factory.annotated and len(present_parents) > 0):
785
# Merge annotations from parent texts if so is needed.
786
delta_hunks = self._merge_annotations(lines, present_parents, parent_texts,
787
delta, self.factory.annotated)
790
options.append('line-delta')
791
store_lines = self.factory.lower_line_delta(delta_hunks)
793
options.append('fulltext')
794
store_lines = self.factory.lower_fulltext(lines)
796
where, size = self._data.add_record(version_id, digest, store_lines)
797
self._index.add_version(version_id, options, where, size, parents)
800
def check(self, progress_bar=None):
801
"""See VersionedFile.check()."""
803
def _clone_text(self, new_version_id, old_version_id, parents):
804
"""See VersionedFile.clone_text()."""
805
# FIXME RBC 20060228 make fast by only inserting an index with null
807
self.add_lines(new_version_id, parents, self.get_lines(old_version_id))
809
def get_lines(self, version_id):
810
"""See VersionedFile.get_lines()."""
811
return self.get_line_list([version_id])[0]
813
def _get_record_map(self, version_ids):
814
"""Produce a dictionary of knit records.
816
The keys are version_ids, the values are tuples of (method, content,
818
method is the way the content should be applied.
819
content is a KnitContent object.
820
digest is the SHA1 digest of this version id after all steps are done
821
next is the build-parent of the version, i.e. the leftmost ancestor.
822
If the method is fulltext, next will be None.
824
position_map = self._get_components_positions(version_ids)
825
# c = component_id, m = method, p = position, s = size, n = next
826
records = [(c, p, s) for c, (m, p, s, n) in position_map.iteritems()]
828
for component_id, content, digest in \
829
self._data.read_records_iter(records):
830
method, position, size, next = position_map[component_id]
831
record_map[component_id] = method, content, digest, next
835
def get_text(self, version_id):
836
"""See VersionedFile.get_text"""
837
return self.get_texts([version_id])[0]
839
def get_texts(self, version_ids):
840
return [''.join(l) for l in self.get_line_list(version_ids)]
842
def get_line_list(self, version_ids):
843
"""Return the texts of listed versions as a list of strings."""
844
version_ids = [osutils.safe_revision_id(v) for v in version_ids]
845
for version_id in version_ids:
846
self.check_not_reserved_id(version_id)
847
text_map, content_map = self._get_content_maps(version_ids)
848
return [text_map[v] for v in version_ids]
850
_get_lf_split_line_list = get_line_list
852
def _get_content_maps(self, version_ids):
853
"""Produce maps of text and KnitContents
855
:return: (text_map, content_map) where text_map contains the texts for
856
the requested versions and content_map contains the KnitContents.
857
Both dicts take version_ids as their keys.
859
for version_id in version_ids:
860
if not self.has_version(version_id):
861
raise RevisionNotPresent(version_id, self.filename)
862
record_map = self._get_record_map(version_ids)
867
for version_id in version_ids:
870
while cursor is not None:
871
method, data, digest, next = record_map[cursor]
872
components.append((cursor, method, data, digest))
873
if cursor in content_map:
878
for component_id, method, data, digest in reversed(components):
879
if component_id in content_map:
880
content = content_map[component_id]
882
if method == 'fulltext':
883
assert content is None
884
content = self.factory.parse_fulltext(data, version_id)
885
elif method == 'line-delta':
886
delta = self.factory.parse_line_delta(data, version_id)
887
content = content.copy()
888
content._lines = self._apply_delta(content._lines,
890
content_map[component_id] = content
892
if 'no-eol' in self._index.get_options(version_id):
893
content = content.copy()
894
line = content._lines[-1][1].rstrip('\n')
895
content._lines[-1] = (content._lines[-1][0], line)
896
final_content[version_id] = content
898
# digest here is the digest from the last applied component.
899
text = content.text()
900
if sha_strings(text) != digest:
901
raise KnitCorrupt(self.filename,
902
'sha-1 does not match %s' % version_id)
904
text_map[version_id] = text
905
return text_map, final_content
907
def iter_lines_added_or_present_in_versions(self, version_ids=None,
909
"""See VersionedFile.iter_lines_added_or_present_in_versions()."""
910
if version_ids is None:
911
version_ids = self.versions()
913
version_ids = [osutils.safe_revision_id(v) for v in version_ids]
915
pb = progress.DummyProgress()
916
# we don't care about inclusions, the caller cares.
917
# but we need to setup a list of records to visit.
918
# we need version_id, position, length
919
version_id_records = []
920
requested_versions = set(version_ids)
921
# filter for available versions
922
for version_id in requested_versions:
923
if not self.has_version(version_id):
924
raise RevisionNotPresent(version_id, self.filename)
925
# get a in-component-order queue:
926
for version_id in self.versions():
927
if version_id in requested_versions:
928
data_pos, length = self._index.get_position(version_id)
929
version_id_records.append((version_id, data_pos, length))
931
total = len(version_id_records)
932
for version_idx, (version_id, data, sha_value) in \
933
enumerate(self._data.read_records_iter(version_id_records)):
934
pb.update('Walking content.', version_idx, total)
935
method = self._index.get_method(version_id)
937
assert method in ('fulltext', 'line-delta')
938
if method == 'fulltext':
939
line_iterator = self.factory.get_fulltext_content(data)
941
line_iterator = self.factory.get_linedelta_content(data)
942
for line in line_iterator:
945
pb.update('Walking content.', total, total)
947
def num_versions(self):
948
"""See VersionedFile.num_versions()."""
949
return self._index.num_versions()
951
__len__ = num_versions
953
def annotate_iter(self, version_id):
954
"""See VersionedFile.annotate_iter."""
955
version_id = osutils.safe_revision_id(version_id)
956
content = self._get_content(version_id)
957
for origin, text in content.annotate_iter():
960
def get_parents(self, version_id):
961
"""See VersionedFile.get_parents."""
964
# 52554 calls in 1264 872 internal down from 3674
965
version_id = osutils.safe_revision_id(version_id)
967
return self._index.get_parents(version_id)
969
raise RevisionNotPresent(version_id, self.filename)
971
def get_parents_with_ghosts(self, version_id):
972
"""See VersionedFile.get_parents."""
973
version_id = osutils.safe_revision_id(version_id)
975
return self._index.get_parents_with_ghosts(version_id)
977
raise RevisionNotPresent(version_id, self.filename)
979
def get_ancestry(self, versions, topo_sorted=True):
980
"""See VersionedFile.get_ancestry."""
981
if isinstance(versions, basestring):
982
versions = [versions]
985
versions = [osutils.safe_revision_id(v) for v in versions]
986
return self._index.get_ancestry(versions, topo_sorted)
988
def get_ancestry_with_ghosts(self, versions):
989
"""See VersionedFile.get_ancestry_with_ghosts."""
990
if isinstance(versions, basestring):
991
versions = [versions]
994
versions = [osutils.safe_revision_id(v) for v in versions]
995
return self._index.get_ancestry_with_ghosts(versions)
997
#@deprecated_method(zero_eight)
998
def walk(self, version_ids):
999
"""See VersionedFile.walk."""
1000
# We take the short path here, and extract all relevant texts
1001
# and put them in a weave and let that do all the work. Far
1002
# from optimal, but is much simpler.
1003
# FIXME RB 20060228 this really is inefficient!
1004
from bzrlib.weave import Weave
1006
w = Weave(self.filename)
1007
ancestry = set(self.get_ancestry(version_ids, topo_sorted=False))
1008
sorted_graph = topo_sort(self._index.get_graph())
1009
version_list = [vid for vid in sorted_graph if vid in ancestry]
1011
for version_id in version_list:
1012
lines = self.get_lines(version_id)
1013
w.add_lines(version_id, self.get_parents(version_id), lines)
1015
for lineno, insert_id, dset, line in w.walk(version_ids):
1016
yield lineno, insert_id, dset, line
1018
def plan_merge(self, ver_a, ver_b):
1019
"""See VersionedFile.plan_merge."""
1020
ver_a = osutils.safe_revision_id(ver_a)
1021
ver_b = osutils.safe_revision_id(ver_b)
1022
ancestors_b = set(self.get_ancestry(ver_b, topo_sorted=False))
1023
def status_a(revision, text):
1024
if revision in ancestors_b:
1025
return 'killed-b', text
1027
return 'new-a', text
1029
ancestors_a = set(self.get_ancestry(ver_a, topo_sorted=False))
1030
def status_b(revision, text):
1031
if revision in ancestors_a:
1032
return 'killed-a', text
1034
return 'new-b', text
1036
annotated_a = self.annotate(ver_a)
1037
annotated_b = self.annotate(ver_b)
1038
plain_a = [t for (a, t) in annotated_a]
1039
plain_b = [t for (a, t) in annotated_b]
1040
blocks = KnitSequenceMatcher(None, plain_a, plain_b).get_matching_blocks()
1043
for ai, bi, l in blocks:
1044
# process all mismatched sections
1045
# (last mismatched section is handled because blocks always
1046
# includes a 0-length last block)
1047
for revision, text in annotated_a[a_cur:ai]:
1048
yield status_a(revision, text)
1049
for revision, text in annotated_b[b_cur:bi]:
1050
yield status_b(revision, text)
1052
# and now the matched section
1055
for text_a, text_b in zip(plain_a[ai:a_cur], plain_b[bi:b_cur]):
1056
assert text_a == text_b
1057
yield "unchanged", text_a
1060
class _KnitComponentFile(object):
1061
"""One of the files used to implement a knit database"""
1063
def __init__(self, transport, filename, mode, file_mode=None,
1064
create_parent_dir=False, dir_mode=None):
1065
self._transport = transport
1066
self._filename = filename
1068
self._file_mode = file_mode
1069
self._dir_mode = dir_mode
1070
self._create_parent_dir = create_parent_dir
1071
self._need_to_create = False
1073
def _full_path(self):
1074
"""Return the full path to this file."""
1075
return self._transport.base + self._filename
1077
def check_header(self, fp):
1078
line = fp.readline()
1080
# An empty file can actually be treated as though the file doesn't
1082
raise errors.NoSuchFile(self._full_path())
1083
if line != self.HEADER:
1084
raise KnitHeaderError(badline=line,
1085
filename=self._transport.abspath(self._filename))
1088
"""Commit is a nop."""
1091
return '%s(%s)' % (self.__class__.__name__, self._filename)
1094
class _KnitIndex(_KnitComponentFile):
1095
"""Manages knit index file.
1097
The index is already kept in memory and read on startup, to enable
1098
fast lookups of revision information. The cursor of the index
1099
file is always pointing to the end, making it easy to append
1102
_cache is a cache for fast mapping from version id to a Index
1105
_history is a cache for fast mapping from indexes to version ids.
1107
The index data format is dictionary compressed when it comes to
1108
parent references; a index entry may only have parents that with a
1109
lover index number. As a result, the index is topological sorted.
1111
Duplicate entries may be written to the index for a single version id
1112
if this is done then the latter one completely replaces the former:
1113
this allows updates to correct version and parent information.
1114
Note that the two entries may share the delta, and that successive
1115
annotations and references MUST point to the first entry.
1117
The index file on disc contains a header, followed by one line per knit
1118
record. The same revision can be present in an index file more than once.
1119
The first occurrence gets assigned a sequence number starting from 0.
1121
The format of a single line is
1122
REVISION_ID FLAGS BYTE_OFFSET LENGTH( PARENT_ID|PARENT_SEQUENCE_ID)* :\n
1123
REVISION_ID is a utf8-encoded revision id
1124
FLAGS is a comma separated list of flags about the record. Values include
1125
no-eol, line-delta, fulltext.
1126
BYTE_OFFSET is the ascii representation of the byte offset in the data file
1127
that the the compressed data starts at.
1128
LENGTH is the ascii representation of the length of the data file.
1129
PARENT_ID a utf-8 revision id prefixed by a '.' that is a parent of
1131
PARENT_SEQUENCE_ID the ascii representation of the sequence number of a
1132
revision id already in the knit that is a parent of REVISION_ID.
1133
The ' :' marker is the end of record marker.
1136
when a write is interrupted to the index file, it will result in a line
1137
that does not end in ' :'. If the ' :' is not present at the end of a line,
1138
or at the end of the file, then the record that is missing it will be
1139
ignored by the parser.
1141
When writing new records to the index file, the data is preceded by '\n'
1142
to ensure that records always start on new lines even if the last write was
1143
interrupted. As a result its normal for the last line in the index to be
1144
missing a trailing newline. One can be added with no harmful effects.
1147
HEADER = "# bzr knit index 8\n"
1149
# speed of knit parsing went from 280 ms to 280 ms with slots addition.
1150
# __slots__ = ['_cache', '_history', '_transport', '_filename']
1152
def _cache_version(self, version_id, options, pos, size, parents):
1153
"""Cache a version record in the history array and index cache.
1155
This is inlined into _load_data for performance. KEEP IN SYNC.
1156
(It saves 60ms, 25% of the __init__ overhead on local 4000 record
1159
# only want the _history index to reference the 1st index entry
1161
if version_id not in self._cache:
1162
index = len(self._history)
1163
self._history.append(version_id)
1165
index = self._cache[version_id][5]
1166
self._cache[version_id] = (version_id,
1173
def __init__(self, transport, filename, mode, create=False, file_mode=None,
1174
create_parent_dir=False, delay_create=False, dir_mode=None):
1175
_KnitComponentFile.__init__(self, transport, filename, mode,
1176
file_mode=file_mode,
1177
create_parent_dir=create_parent_dir,
1180
# position in _history is the 'official' index for a revision
1181
# but the values may have come from a newer entry.
1182
# so - wc -l of a knit index is != the number of unique names
1186
fp = self._transport.get(self._filename)
1188
# _load_data may raise NoSuchFile if the target knit is
1190
_load_data(self, fp)
1194
if mode != 'w' or not create:
1197
self._need_to_create = True
1199
self._transport.put_bytes_non_atomic(
1200
self._filename, self.HEADER, mode=self._file_mode)
1202
def get_graph(self):
1203
return [(vid, idx[4]) for vid, idx in self._cache.iteritems()]
1205
def get_ancestry(self, versions, topo_sorted=True):
1206
"""See VersionedFile.get_ancestry."""
1207
# get a graph of all the mentioned versions:
1209
pending = set(versions)
1212
version = pending.pop()
1215
parents = [p for p in cache[version][4] if p in cache]
1217
raise RevisionNotPresent(version, self._filename)
1218
# if not completed and not a ghost
1219
pending.update([p for p in parents if p not in graph])
1220
graph[version] = parents
1223
return topo_sort(graph.items())
1225
def get_ancestry_with_ghosts(self, versions):
1226
"""See VersionedFile.get_ancestry_with_ghosts."""
1227
# get a graph of all the mentioned versions:
1228
self.check_versions_present(versions)
1231
pending = set(versions)
1233
version = pending.pop()
1235
parents = cache[version][4]
1241
pending.update([p for p in parents if p not in graph])
1242
graph[version] = parents
1243
return topo_sort(graph.items())
1245
def num_versions(self):
1246
return len(self._history)
1248
__len__ = num_versions
1250
def get_versions(self):
1251
return self._history
1253
def idx_to_name(self, idx):
1254
return self._history[idx]
1256
def lookup(self, version_id):
1257
assert version_id in self._cache
1258
return self._cache[version_id][5]
1260
def _version_list_to_index(self, versions):
1263
for version in versions:
1264
if version in cache:
1265
# -- inlined lookup() --
1266
result_list.append(str(cache[version][5]))
1267
# -- end lookup () --
1269
result_list.append('.' + version)
1270
return ' '.join(result_list)
1272
def add_version(self, version_id, options, pos, size, parents):
1273
"""Add a version record to the index."""
1274
self.add_versions(((version_id, options, pos, size, parents),))
1276
def add_versions(self, versions):
1277
"""Add multiple versions to the index.
1279
:param versions: a list of tuples:
1280
(version_id, options, pos, size, parents).
1283
orig_history = self._history[:]
1284
orig_cache = self._cache.copy()
1287
for version_id, options, pos, size, parents in versions:
1288
line = "\n%s %s %s %s %s :" % (version_id,
1292
self._version_list_to_index(parents))
1293
assert isinstance(line, str), \
1294
'content must be utf-8 encoded: %r' % (line,)
1296
self._cache_version(version_id, options, pos, size, parents)
1297
if not self._need_to_create:
1298
self._transport.append_bytes(self._filename, ''.join(lines))
1301
sio.write(self.HEADER)
1302
sio.writelines(lines)
1304
self._transport.put_file_non_atomic(self._filename, sio,
1305
create_parent_dir=self._create_parent_dir,
1306
mode=self._file_mode,
1307
dir_mode=self._dir_mode)
1308
self._need_to_create = False
1310
# If any problems happen, restore the original values and re-raise
1311
self._history = orig_history
1312
self._cache = orig_cache
1315
def has_version(self, version_id):
1316
"""True if the version is in the index."""
1317
return version_id in self._cache
1319
def get_position(self, version_id):
1320
"""Return data position and size of specified version."""
1321
entry = self._cache[version_id]
1322
return entry[2], entry[3]
1324
def get_method(self, version_id):
1325
"""Return compression method of specified version."""
1326
options = self._cache[version_id][1]
1327
if 'fulltext' in options:
1330
if 'line-delta' not in options:
1331
raise errors.KnitIndexUnknownMethod(self._full_path(), options)
1334
def get_options(self, version_id):
1335
return self._cache[version_id][1]
1337
def get_parents(self, version_id):
1338
"""Return parents of specified version ignoring ghosts."""
1339
return [parent for parent in self._cache[version_id][4]
1340
if parent in self._cache]
1342
def get_parents_with_ghosts(self, version_id):
1343
"""Return parents of specified version with ghosts."""
1344
return self._cache[version_id][4]
1346
def check_versions_present(self, version_ids):
1347
"""Check that all specified versions are present."""
1349
for version_id in version_ids:
1350
if version_id not in cache:
1351
raise RevisionNotPresent(version_id, self._filename)
1354
class _KnitData(_KnitComponentFile):
1355
"""Contents of the knit data file"""
1357
def __init__(self, transport, filename, mode, create=False, file_mode=None,
1358
create_parent_dir=False, delay_create=False,
1360
_KnitComponentFile.__init__(self, transport, filename, mode,
1361
file_mode=file_mode,
1362
create_parent_dir=create_parent_dir,
1364
self._checked = False
1365
# TODO: jam 20060713 conceptually, this could spill to disk
1366
# if the cached size gets larger than a certain amount
1367
# but it complicates the model a bit, so for now just use
1368
# a simple dictionary
1370
self._do_cache = False
1373
self._need_to_create = create
1375
self._transport.put_bytes_non_atomic(self._filename, '',
1376
mode=self._file_mode)
1378
def enable_cache(self):
1379
"""Enable caching of reads."""
1380
self._do_cache = True
1382
def clear_cache(self):
1383
"""Clear the record cache."""
1384
self._do_cache = False
1387
def _open_file(self):
1389
return self._transport.get(self._filename)
1394
def _record_to_data(self, version_id, digest, lines):
1395
"""Convert version_id, digest, lines into a raw data block.
1397
:return: (len, a StringIO instance with the raw data ready to read.)
1400
data_file = GzipFile(None, mode='wb', fileobj=sio)
1402
assert isinstance(version_id, str)
1403
data_file.writelines(chain(
1404
["version %s %d %s\n" % (version_id,
1408
["end %s\n" % version_id]))
1415
def add_raw_record(self, raw_data):
1416
"""Append a prepared record to the data file.
1418
:return: the offset in the data file raw_data was written.
1420
assert isinstance(raw_data, str), 'data must be plain bytes'
1421
if not self._need_to_create:
1422
return self._transport.append_bytes(self._filename, raw_data)
1424
self._transport.put_bytes_non_atomic(self._filename, raw_data,
1425
create_parent_dir=self._create_parent_dir,
1426
mode=self._file_mode,
1427
dir_mode=self._dir_mode)
1428
self._need_to_create = False
1431
def add_record(self, version_id, digest, lines):
1432
"""Write new text record to disk. Returns the position in the
1433
file where it was written."""
1434
size, sio = self._record_to_data(version_id, digest, lines)
1436
if not self._need_to_create:
1437
start_pos = self._transport.append_file(self._filename, sio)
1439
self._transport.put_file_non_atomic(self._filename, sio,
1440
create_parent_dir=self._create_parent_dir,
1441
mode=self._file_mode,
1442
dir_mode=self._dir_mode)
1443
self._need_to_create = False
1446
self._cache[version_id] = sio.getvalue()
1447
return start_pos, size
1449
def _parse_record_header(self, version_id, raw_data):
1450
"""Parse a record header for consistency.
1452
:return: the header and the decompressor stream.
1453
as (stream, header_record)
1455
df = GzipFile(mode='rb', fileobj=StringIO(raw_data))
1457
rec = self._check_header(version_id, df.readline())
1458
except Exception, e:
1459
raise KnitCorrupt(self._filename,
1460
"While reading {%s} got %s(%s)"
1461
% (version_id, e.__class__.__name__, str(e)))
1464
def _check_header(self, version_id, line):
1467
raise KnitCorrupt(self._filename,
1468
'unexpected number of elements in record header')
1469
if rec[1] != version_id:
1470
raise KnitCorrupt(self._filename,
1471
'unexpected version, wanted %r, got %r'
1472
% (version_id, rec[1]))
1475
def _parse_record(self, version_id, data):
1477
# 4168 calls in 2880 217 internal
1478
# 4168 calls to _parse_record_header in 2121
1479
# 4168 calls to readlines in 330
1480
df = GzipFile(mode='rb', fileobj=StringIO(data))
1483
record_contents = df.readlines()
1484
except Exception, e:
1485
raise KnitCorrupt(self._filename,
1486
"While reading {%s} got %s(%s)"
1487
% (version_id, e.__class__.__name__, str(e)))
1488
header = record_contents.pop(0)
1489
rec = self._check_header(version_id, header)
1491
last_line = record_contents.pop()
1492
if len(record_contents) != int(rec[2]):
1493
raise KnitCorrupt(self._filename,
1494
'incorrect number of lines %s != %s'
1496
% (len(record_contents), int(rec[2]),
1498
if last_line != 'end %s\n' % rec[1]:
1499
raise KnitCorrupt(self._filename,
1500
'unexpected version end line %r, wanted %r'
1501
% (last_line, version_id))
1503
return record_contents, rec[3]
1505
def read_records_iter_raw(self, records):
1506
"""Read text records from data file and yield raw data.
1508
This unpacks enough of the text record to validate the id is
1509
as expected but thats all.
1511
# setup an iterator of the external records:
1512
# uses readv so nice and fast we hope.
1514
# grab the disk data needed.
1516
# Don't check _cache if it is empty
1517
needed_offsets = [(pos, size) for version_id, pos, size
1519
if version_id not in self._cache]
1521
needed_offsets = [(pos, size) for version_id, pos, size
1524
raw_records = self._transport.readv(self._filename, needed_offsets)
1526
for version_id, pos, size in records:
1527
if version_id in self._cache:
1528
# This data has already been validated
1529
data = self._cache[version_id]
1531
pos, data = raw_records.next()
1533
self._cache[version_id] = data
1535
# validate the header
1536
df, rec = self._parse_record_header(version_id, data)
1538
yield version_id, data
1540
def read_records_iter(self, records):
1541
"""Read text records from data file and yield result.
1543
The result will be returned in whatever is the fastest to read.
1544
Not by the order requested. Also, multiple requests for the same
1545
record will only yield 1 response.
1546
:param records: A list of (version_id, pos, len) entries
1547
:return: Yields (version_id, contents, digest) in the order
1548
read, not the order requested
1554
# Skip records we have alread seen
1555
yielded_records = set()
1556
needed_records = set()
1557
for record in records:
1558
if record[0] in self._cache:
1559
if record[0] in yielded_records:
1561
yielded_records.add(record[0])
1562
data = self._cache[record[0]]
1563
content, digest = self._parse_record(record[0], data)
1564
yield (record[0], content, digest)
1566
needed_records.add(record)
1567
needed_records = sorted(needed_records, key=operator.itemgetter(1))
1569
needed_records = sorted(set(records), key=operator.itemgetter(1))
1571
if not needed_records:
1574
# The transport optimizes the fetching as well
1575
# (ie, reads continuous ranges.)
1576
readv_response = self._transport.readv(self._filename,
1577
[(pos, size) for version_id, pos, size in needed_records])
1579
for (version_id, pos, size), (pos, data) in \
1580
izip(iter(needed_records), readv_response):
1581
content, digest = self._parse_record(version_id, data)
1583
self._cache[version_id] = data
1584
yield version_id, content, digest
1586
def read_records(self, records):
1587
"""Read records into a dictionary."""
1589
for record_id, content, digest in \
1590
self.read_records_iter(records):
1591
components[record_id] = (content, digest)
1595
class InterKnit(InterVersionedFile):
1596
"""Optimised code paths for knit to knit operations."""
1598
_matching_file_from_factory = KnitVersionedFile
1599
_matching_file_to_factory = KnitVersionedFile
1602
def is_compatible(source, target):
1603
"""Be compatible with knits. """
1605
return (isinstance(source, KnitVersionedFile) and
1606
isinstance(target, KnitVersionedFile))
1607
except AttributeError:
1610
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
1611
"""See InterVersionedFile.join."""
1612
assert isinstance(self.source, KnitVersionedFile)
1613
assert isinstance(self.target, KnitVersionedFile)
1615
version_ids = self._get_source_version_ids(version_ids, ignore_missing)
1620
pb = ui.ui_factory.nested_progress_bar()
1622
version_ids = list(version_ids)
1623
if None in version_ids:
1624
version_ids.remove(None)
1626
self.source_ancestry = set(self.source.get_ancestry(version_ids))
1627
this_versions = set(self.target._index.get_versions())
1628
needed_versions = self.source_ancestry - this_versions
1629
cross_check_versions = self.source_ancestry.intersection(this_versions)
1630
mismatched_versions = set()
1631
for version in cross_check_versions:
1632
# scan to include needed parents.
1633
n1 = set(self.target.get_parents_with_ghosts(version))
1634
n2 = set(self.source.get_parents_with_ghosts(version))
1636
# FIXME TEST this check for cycles being introduced works
1637
# the logic is we have a cycle if in our graph we are an
1638
# ancestor of any of the n2 revisions.
1644
parent_ancestors = self.source.get_ancestry(parent)
1645
if version in parent_ancestors:
1646
raise errors.GraphCycleError([parent, version])
1647
# ensure this parent will be available later.
1648
new_parents = n2.difference(n1)
1649
needed_versions.update(new_parents.difference(this_versions))
1650
mismatched_versions.add(version)
1652
if not needed_versions and not mismatched_versions:
1654
full_list = topo_sort(self.source.get_graph())
1656
version_list = [i for i in full_list if (not self.target.has_version(i)
1657
and i in needed_versions)]
1661
copy_queue_records = []
1663
for version_id in version_list:
1664
options = self.source._index.get_options(version_id)
1665
parents = self.source._index.get_parents_with_ghosts(version_id)
1666
# check that its will be a consistent copy:
1667
for parent in parents:
1668
# if source has the parent, we must :
1669
# * already have it or
1670
# * have it scheduled already
1671
# otherwise we don't care
1672
assert (self.target.has_version(parent) or
1673
parent in copy_set or
1674
not self.source.has_version(parent))
1675
data_pos, data_size = self.source._index.get_position(version_id)
1676
copy_queue_records.append((version_id, data_pos, data_size))
1677
copy_queue.append((version_id, options, parents))
1678
copy_set.add(version_id)
1680
# data suck the join:
1682
total = len(version_list)
1685
for (version_id, raw_data), \
1686
(version_id2, options, parents) in \
1687
izip(self.source._data.read_records_iter_raw(copy_queue_records),
1689
assert version_id == version_id2, 'logic error, inconsistent results'
1691
pb.update("Joining knit", count, total)
1692
raw_records.append((version_id, options, parents, len(raw_data)))
1693
raw_datum.append(raw_data)
1694
self.target._add_raw_records(raw_records, ''.join(raw_datum))
1696
for version in mismatched_versions:
1697
# FIXME RBC 20060309 is this needed?
1698
n1 = set(self.target.get_parents_with_ghosts(version))
1699
n2 = set(self.source.get_parents_with_ghosts(version))
1700
# write a combined record to our history preserving the current
1701
# parents as first in the list
1702
new_parents = self.target.get_parents_with_ghosts(version) + list(n2.difference(n1))
1703
self.target.fix_parents(version, new_parents)
1709
InterVersionedFile.register_optimiser(InterKnit)
1712
class WeaveToKnit(InterVersionedFile):
1713
"""Optimised code paths for weave to knit operations."""
1715
_matching_file_from_factory = bzrlib.weave.WeaveFile
1716
_matching_file_to_factory = KnitVersionedFile
1719
def is_compatible(source, target):
1720
"""Be compatible with weaves to knits."""
1722
return (isinstance(source, bzrlib.weave.Weave) and
1723
isinstance(target, KnitVersionedFile))
1724
except AttributeError:
1727
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
1728
"""See InterVersionedFile.join."""
1729
assert isinstance(self.source, bzrlib.weave.Weave)
1730
assert isinstance(self.target, KnitVersionedFile)
1732
version_ids = self._get_source_version_ids(version_ids, ignore_missing)
1737
pb = ui.ui_factory.nested_progress_bar()
1739
version_ids = list(version_ids)
1741
self.source_ancestry = set(self.source.get_ancestry(version_ids))
1742
this_versions = set(self.target._index.get_versions())
1743
needed_versions = self.source_ancestry - this_versions
1744
cross_check_versions = self.source_ancestry.intersection(this_versions)
1745
mismatched_versions = set()
1746
for version in cross_check_versions:
1747
# scan to include needed parents.
1748
n1 = set(self.target.get_parents_with_ghosts(version))
1749
n2 = set(self.source.get_parents(version))
1750
# if all of n2's parents are in n1, then its fine.
1751
if n2.difference(n1):
1752
# FIXME TEST this check for cycles being introduced works
1753
# the logic is we have a cycle if in our graph we are an
1754
# ancestor of any of the n2 revisions.
1760
parent_ancestors = self.source.get_ancestry(parent)
1761
if version in parent_ancestors:
1762
raise errors.GraphCycleError([parent, version])
1763
# ensure this parent will be available later.
1764
new_parents = n2.difference(n1)
1765
needed_versions.update(new_parents.difference(this_versions))
1766
mismatched_versions.add(version)
1768
if not needed_versions and not mismatched_versions:
1770
full_list = topo_sort(self.source.get_graph())
1772
version_list = [i for i in full_list if (not self.target.has_version(i)
1773
and i in needed_versions)]
1777
total = len(version_list)
1778
for version_id in version_list:
1779
pb.update("Converting to knit", count, total)
1780
parents = self.source.get_parents(version_id)
1781
# check that its will be a consistent copy:
1782
for parent in parents:
1783
# if source has the parent, we must already have it
1784
assert (self.target.has_version(parent))
1785
self.target.add_lines(
1786
version_id, parents, self.source.get_lines(version_id))
1789
for version in mismatched_versions:
1790
# FIXME RBC 20060309 is this needed?
1791
n1 = set(self.target.get_parents_with_ghosts(version))
1792
n2 = set(self.source.get_parents(version))
1793
# write a combined record to our history preserving the current
1794
# parents as first in the list
1795
new_parents = self.target.get_parents_with_ghosts(version) + list(n2.difference(n1))
1796
self.target.fix_parents(version, new_parents)
1802
InterVersionedFile.register_optimiser(WeaveToKnit)
1805
class KnitSequenceMatcher(difflib.SequenceMatcher):
1806
"""Knit tuned sequence matcher.
1808
This is based on profiling of difflib which indicated some improvements
1809
for our usage pattern.
1812
def find_longest_match(self, alo, ahi, blo, bhi):
1813
"""Find longest matching block in a[alo:ahi] and b[blo:bhi].
1815
If isjunk is not defined:
1817
Return (i,j,k) such that a[i:i+k] is equal to b[j:j+k], where
1818
alo <= i <= i+k <= ahi
1819
blo <= j <= j+k <= bhi
1820
and for all (i',j',k') meeting those conditions,
1823
and if i == i', j <= j'
1825
In other words, of all maximal matching blocks, return one that
1826
starts earliest in a, and of all those maximal matching blocks that
1827
start earliest in a, return the one that starts earliest in b.
1829
>>> s = SequenceMatcher(None, " abcd", "abcd abcd")
1830
>>> s.find_longest_match(0, 5, 0, 9)
1833
If isjunk is defined, first the longest matching block is
1834
determined as above, but with the additional restriction that no
1835
junk element appears in the block. Then that block is extended as
1836
far as possible by matching (only) junk elements on both sides. So
1837
the resulting block never matches on junk except as identical junk
1838
happens to be adjacent to an "interesting" match.
1840
Here's the same example as before, but considering blanks to be
1841
junk. That prevents " abcd" from matching the " abcd" at the tail
1842
end of the second sequence directly. Instead only the "abcd" can
1843
match, and matches the leftmost "abcd" in the second sequence:
1845
>>> s = SequenceMatcher(lambda x: x==" ", " abcd", "abcd abcd")
1846
>>> s.find_longest_match(0, 5, 0, 9)
1849
If no blocks match, return (alo, blo, 0).
1851
>>> s = SequenceMatcher(None, "ab", "c")
1852
>>> s.find_longest_match(0, 2, 0, 1)
1856
# CAUTION: stripping common prefix or suffix would be incorrect.
1860
# Longest matching block is "ab", but if common prefix is
1861
# stripped, it's "a" (tied with "b"). UNIX(tm) diff does so
1862
# strip, so ends up claiming that ab is changed to acab by
1863
# inserting "ca" in the middle. That's minimal but unintuitive:
1864
# "it's obvious" that someone inserted "ac" at the front.
1865
# Windiff ends up at the same place as diff, but by pairing up
1866
# the unique 'b's and then matching the first two 'a's.
1868
a, b, b2j, isbjunk = self.a, self.b, self.b2j, self.isbjunk
1869
besti, bestj, bestsize = alo, blo, 0
1870
# find longest junk-free match
1871
# during an iteration of the loop, j2len[j] = length of longest
1872
# junk-free match ending with a[i-1] and b[j]
1876
for i in xrange(alo, ahi):
1877
# look at all instances of a[i] in b; note that because
1878
# b2j has no junk keys, the loop is skipped if a[i] is junk
1879
j2lenget = j2len.get
1882
# changing b2j.get(a[i], nothing) to a try:KeyError pair produced the
1883
# following improvement
1884
# 704 0 4650.5320 2620.7410 bzrlib.knit:1336(find_longest_match)
1885
# +326674 0 1655.1210 1655.1210 +<method 'get' of 'dict' objects>
1886
# +76519 0 374.6700 374.6700 +<method 'has_key' of 'dict' objects>
1888
# 704 0 3733.2820 2209.6520 bzrlib.knit:1336(find_longest_match)
1889
# +211400 0 1147.3520 1147.3520 +<method 'get' of 'dict' objects>
1890
# +76519 0 376.2780 376.2780 +<method 'has_key' of 'dict' objects>
1902
k = newj2len[j] = 1 + j2lenget(-1 + j, 0)
1904
besti, bestj, bestsize = 1 + i-k, 1 + j-k, k
1907
# Extend the best by non-junk elements on each end. In particular,
1908
# "popular" non-junk elements aren't in b2j, which greatly speeds
1909
# the inner loop above, but also means "the best" match so far
1910
# doesn't contain any junk *or* popular non-junk elements.
1911
while besti > alo and bestj > blo and \
1912
not isbjunk(b[bestj-1]) and \
1913
a[besti-1] == b[bestj-1]:
1914
besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
1915
while besti+bestsize < ahi and bestj+bestsize < bhi and \
1916
not isbjunk(b[bestj+bestsize]) and \
1917
a[besti+bestsize] == b[bestj+bestsize]:
1920
# Now that we have a wholly interesting match (albeit possibly
1921
# empty!), we may as well suck up the matching junk on each
1922
# side of it too. Can't think of a good reason not to, and it
1923
# saves post-processing the (possibly considerable) expense of
1924
# figuring out what to do with it. In the case of an empty
1925
# interesting match, this is clearly the right thing to do,
1926
# because no other kind of match is possible in the regions.
1927
while besti > alo and bestj > blo and \
1928
isbjunk(b[bestj-1]) and \
1929
a[besti-1] == b[bestj-1]:
1930
besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
1931
while besti+bestsize < ahi and bestj+bestsize < bhi and \
1932
isbjunk(b[bestj+bestsize]) and \
1933
a[besti+bestsize] == b[bestj+bestsize]:
1934
bestsize = bestsize + 1
1936
return besti, bestj, bestsize
1940
from bzrlib._knit_load_data_c import _load_data_c as _load_data
1942
from bzrlib._knit_load_data_py import _load_data_py as _load_data
added
removed
bzrlib/knit.py
