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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 zlib import Z_DEFAULT_COMPRESSION
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from bzrlib.errors import (
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KnitDataStreamIncompatible,
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RevisionAlreadyPresent,
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from bzrlib.tuned_gzip import GzipFile, bytes_to_gzip
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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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"""Return a list of (origin, text) tuples."""
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return list(self.annotate_iter())
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def apply_delta(self, delta, new_version_id):
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"""Apply delta to this object to become new_version_id."""
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raise NotImplementedError(self.apply_delta)
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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 = patiencediff.PatienceSequenceMatcher(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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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 AnnotatedKnitContent(KnitContent):
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"""Annotated content."""
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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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def apply_delta(self, delta, new_version_id):
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"""Apply delta to this object to become new_version_id."""
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for start, end, count, delta_lines in delta:
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lines[offset+start:offset+end] = delta_lines
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offset = offset + (start - end) + count
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def strip_last_line_newline(self):
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line = self._lines[-1][1].rstrip('\n')
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self._lines[-1] = (self._lines[-1][0], line)
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return [text for origin, text in self._lines]
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except ValueError, e:
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# most commonly (only?) caused by the internal form of the knit
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# missing annotation information because of a bug - see thread
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raise KnitCorrupt(self,
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"line in annotated knit missing annotation information: %s"
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return AnnotatedKnitContent(self._lines[:])
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class PlainKnitContent(KnitContent):
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"""Unannotated content.
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When annotate[_iter] is called on this content, the same version is reported
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for all lines. Generally, annotate[_iter] is not useful on PlainKnitContent
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def __init__(self, lines, version_id):
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self._version_id = version_id
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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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for line in self._lines:
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yield self._version_id, line
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def apply_delta(self, delta, new_version_id):
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"""Apply delta to this object to become new_version_id."""
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for start, end, count, delta_lines in delta:
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lines[offset+start:offset+end] = delta_lines
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offset = offset + (start - end) + count
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self._version_id = new_version_id
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return PlainKnitContent(self._lines[:], self._version_id)
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def strip_last_line_newline(self):
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self._lines[-1] = self._lines[-1].rstrip('\n')
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class KnitAnnotateFactory(object):
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"""Factory for creating annotated 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 AnnotatedKnitContent(zip([version_id] * num_lines, lines))
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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 AnnotatedKnitContent(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, plain=False):
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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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:param plain: If True, the lines are returned as a plain
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list without annotations, not as a list of (origin, content) tuples, i.e.
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(start, end, count, [1..count 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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# Note that the plain test is explicitly pulled out of the
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# loop to minimise any performance impact
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start, end, count = [int(n) for n in header.split(',')]
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contents = [next().split(' ', 1)[1] for i in xrange(count)]
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result.append((start, end, count, contents))
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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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def annotate_iter(self, knit, version_id):
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content = knit._get_content(version_id)
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return content.annotate_iter()
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class KnitPlainFactory(object):
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"""Factory for creating plain Content objects."""
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def make(self, lines, version_id):
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return PlainKnitContent(lines, version_id)
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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, 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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def annotate_iter(self, knit, version_id):
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return annotate_knit(knit, version_id)
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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, delta=True, create=False, create_parent_dir=False,
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delay_create=False, dir_mode=None, index=None, access_method=None):
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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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:param index: An index to use for the knit.
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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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if access_method is None:
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_access = _KnitAccess(transport, relpath + DATA_SUFFIX, file_mode, dir_mode,
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((create and not len(self)) and delay_create), create_parent_dir)
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_access = access_method
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if create and not len(self) and not delay_create:
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self._data = _KnitData(_access)
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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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index, 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_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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raw_record_sizes = [record[3] for record in records]
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positions = self._data.add_raw_records(raw_record_sizes, data)
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for (version_id, options, parents, size), access_memo in zip(
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index_entries.append((version_id, options, access_memo, parents))
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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 get_data_stream(self, required_versions):
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"""Get a data stream for the specified versions.
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Versions may be returned in any order, not necessarily the order
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:param required_versions: The exact set of versions to be extracted.
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Unlike some other knit methods, this is not used to generate a
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transitive closure, rather it is used precisely as given.
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:returns: format_signature, list of (version, options, length, parents),
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if not isinstance(required_versions, set):
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required_versions = set(required_versions)
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# we don't care about inclusions, the caller cares.
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# but we need to setup a list of records to visit.
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for version_id in required_versions:
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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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# Pick the desired versions out of the index in oldest-to-newest order
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for version_id in self.versions():
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if version_id in required_versions:
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version_list.append(version_id)
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# create the list of version information for the result
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copy_queue_records = []
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result_version_list = []
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for version_id in version_list:
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options = self._index.get_options(version_id)
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parents = self._index.get_parents_with_ghosts(version_id)
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index_memo = self._index.get_position(version_id)
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copy_queue_records.append((version_id, index_memo))
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none, data_pos, data_size = index_memo
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copy_set.add(version_id)
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# version, options, length, parents
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result_version_list.append((version_id, options, data_size,
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# Read the compressed record data.
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# From here down to the return should really be logic in the returned
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# callable -- in a class that adapts read_records_iter_raw to read
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for (version_id, raw_data), \
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(version_id2, options, _, parents) in \
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izip(self._data.read_records_iter_raw(copy_queue_records),
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result_version_list):
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assert version_id == version_id2, 'logic error, inconsistent results'
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raw_datum.append(raw_data)
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pseudo_file = StringIO(''.join(raw_datum))
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return pseudo_file.read()
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return pseudo_file.read(length)
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return (self.get_format_signature(), result_version_list, read)
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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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self.check_not_reserved_id(version_id)
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parents = self.get_parents(version_id)
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index_memo = self._index.get_position(version_id)
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data, sha1 = self._data.read_records(((version_id, index_memo),))[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 = patiencediff.PatienceSequenceMatcher(None, old_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_format_signature(self):
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"""See VersionedFile.get_format_signature()."""
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if self.factory.annotated:
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annotated_part = "annotated"
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annotated_part = "plain"
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return "knit-%s" % (annotated_part,)
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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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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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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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def insert_data_stream(self, (format, data_list, reader_callable)):
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"""Insert knit records from a data stream into this knit.
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If a version in the stream is already present in this knit, it will not
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be inserted a second time. It will be checked for consistency with the
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stored version however, and may cause a KnitCorrupt error to be raised
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if the data in the stream disagrees with the already stored data.
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:seealso: get_data_stream
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if format != self.get_format_signature():
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trace.mutter('incompatible format signature inserting to %r', self)
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raise KnitDataStreamIncompatible(
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format, self.get_format_signature())
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for version_id, options, length, parents in data_list:
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if self.has_version(version_id):
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# First check: the list of parents.
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my_parents = self.get_parents_with_ghosts(version_id)
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if my_parents != parents:
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# XXX: KnitCorrupt is not quite the right exception here.
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'parents list %r from data stream does not match '
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'already recorded parents %r for %s'
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% (parents, my_parents, version_id))
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# Also check the SHA-1 of the fulltext this content will
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raw_data = reader_callable(length)
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my_fulltext_sha1 = self.get_sha1(version_id)
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df, rec = self._data._parse_record_header(version_id, raw_data)
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stream_fulltext_sha1 = rec[3]
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if my_fulltext_sha1 != stream_fulltext_sha1:
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# Actually, we don't know if it's this knit that's corrupt,
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# or the data stream we're trying to insert.
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self.filename, 'sha-1 does not match %s' % version_id)
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if 'line-delta' in options:
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# Make sure that this knit record is actually useful: a
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# line-delta is no use unless we have its parent.
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# Fetching from a broken repository with this problem
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# shouldn't break the target repository.
752
if not self._index.has_version(parents[0]):
755
'line-delta from stream references '
756
'missing parent %s' % parents[0])
757
self._add_raw_records(
758
[(version_id, options, parents, length)],
759
reader_callable(length))
762
"""See VersionedFile.versions."""
763
if 'evil' in debug.debug_flags:
764
trace.mutter_callsite(2, "versions scales with size of history")
765
return self._index.get_versions()
767
def has_version(self, version_id):
768
"""See VersionedFile.has_version."""
769
if 'evil' in debug.debug_flags:
770
trace.mutter_callsite(2, "has_version is a LBYL scenario")
771
return self._index.has_version(version_id)
773
__contains__ = has_version
775
def _merge_annotations(self, content, parents, parent_texts={},
776
delta=None, annotated=None,
777
left_matching_blocks=None):
778
"""Merge annotations for content. This is done by comparing
779
the annotations based on changed to the text.
781
if left_matching_blocks is not None:
782
delta_seq = diff._PrematchedMatcher(left_matching_blocks)
786
for parent_id in parents:
787
merge_content = self._get_content(parent_id, parent_texts)
788
if (parent_id == parents[0] and delta_seq is not None):
791
seq = patiencediff.PatienceSequenceMatcher(
792
None, merge_content.text(), content.text())
793
for i, j, n in seq.get_matching_blocks():
796
# this appears to copy (origin, text) pairs across to the
797
# new content for any line that matches the last-checked
799
content._lines[j:j+n] = merge_content._lines[i:i+n]
801
if delta_seq is None:
802
reference_content = self._get_content(parents[0], parent_texts)
803
new_texts = content.text()
804
old_texts = reference_content.text()
805
delta_seq = patiencediff.PatienceSequenceMatcher(
806
None, old_texts, new_texts)
807
return self._make_line_delta(delta_seq, content)
809
def _make_line_delta(self, delta_seq, new_content):
810
"""Generate a line delta from delta_seq and new_content."""
812
for op in delta_seq.get_opcodes():
815
diff_hunks.append((op[1], op[2], op[4]-op[3], new_content._lines[op[3]:op[4]]))
818
def _get_components_positions(self, version_ids):
819
"""Produce a map of position data for the components of versions.
821
This data is intended to be used for retrieving the knit records.
823
A dict of version_id to (method, data_pos, data_size, next) is
825
method is the way referenced data should be applied.
826
data_pos is the position of the data in the knit.
827
data_size is the size of the data in the knit.
828
next is the build-parent of the version, or None for fulltexts.
831
for version_id in version_ids:
834
while cursor is not None and cursor not in component_data:
835
method = self._index.get_method(cursor)
836
if method == 'fulltext':
839
next = self.get_parents(cursor)[0]
840
index_memo = self._index.get_position(cursor)
841
component_data[cursor] = (method, index_memo, next)
843
return component_data
845
def _get_content(self, version_id, parent_texts={}):
846
"""Returns a content object that makes up the specified
848
cached_version = parent_texts.get(version_id, None)
849
if cached_version is not None:
850
if not self.has_version(version_id):
851
raise RevisionNotPresent(version_id, self.filename)
852
return cached_version
854
text_map, contents_map = self._get_content_maps([version_id])
855
return contents_map[version_id]
857
def _check_versions_present(self, version_ids):
858
"""Check that all specified versions are present."""
859
self._index.check_versions_present(version_ids)
861
def _add_lines_with_ghosts(self, version_id, parents, lines, parent_texts,
862
nostore_sha, random_id, check_content):
863
"""See VersionedFile.add_lines_with_ghosts()."""
864
self._check_add(version_id, lines, random_id, check_content)
865
return self._add(version_id, lines, parents, self.delta,
866
parent_texts, None, nostore_sha, random_id)
868
def _add_lines(self, version_id, parents, lines, parent_texts,
869
left_matching_blocks, nostore_sha, random_id, check_content):
870
"""See VersionedFile.add_lines."""
871
self._check_add(version_id, lines, random_id, check_content)
872
self._check_versions_present(parents)
873
return self._add(version_id, lines[:], parents, self.delta,
874
parent_texts, left_matching_blocks, nostore_sha, random_id)
876
def _check_add(self, version_id, lines, random_id, check_content):
877
"""check that version_id and lines are safe to add."""
878
if contains_whitespace(version_id):
879
raise InvalidRevisionId(version_id, self.filename)
880
self.check_not_reserved_id(version_id)
881
# Technically this could be avoided if we are happy to allow duplicate
882
# id insertion when other things than bzr core insert texts, but it
883
# seems useful for folk using the knit api directly to have some safety
884
# blanket that we can disable.
885
if not random_id and self.has_version(version_id):
886
raise RevisionAlreadyPresent(version_id, self.filename)
888
self._check_lines_not_unicode(lines)
889
self._check_lines_are_lines(lines)
891
def _add(self, version_id, lines, parents, delta, parent_texts,
892
left_matching_blocks, nostore_sha, random_id):
893
"""Add a set of lines on top of version specified by parents.
895
If delta is true, compress the text as a line-delta against
898
Any versions not present will be converted into ghosts.
900
# first thing, if the content is something we don't need to store, find
902
line_bytes = ''.join(lines)
903
digest = sha_string(line_bytes)
904
if nostore_sha == digest:
905
raise errors.ExistingContent
908
if parent_texts is None:
910
for parent in parents:
911
if self.has_version(parent):
912
present_parents.append(parent)
914
# can only compress against the left most present parent.
916
(len(present_parents) == 0 or
917
present_parents[0] != parents[0])):
920
text_length = len(line_bytes)
923
if lines[-1][-1] != '\n':
924
# copy the contents of lines.
926
options.append('no-eol')
927
lines[-1] = lines[-1] + '\n'
931
# To speed the extract of texts the delta chain is limited
932
# to a fixed number of deltas. This should minimize both
933
# I/O and the time spend applying deltas.
934
delta = self._check_should_delta(present_parents)
936
assert isinstance(version_id, str)
937
content = self.factory.make(lines, version_id)
938
if delta or (self.factory.annotated and len(present_parents) > 0):
939
# Merge annotations from parent texts if needed.
940
delta_hunks = self._merge_annotations(content, present_parents,
941
parent_texts, delta, self.factory.annotated,
942
left_matching_blocks)
945
options.append('line-delta')
946
store_lines = self.factory.lower_line_delta(delta_hunks)
947
size, bytes = self._data._record_to_data(version_id, digest,
950
options.append('fulltext')
951
# isinstance is slower and we have no hierarchy.
952
if self.factory.__class__ == KnitPlainFactory:
953
# Use the already joined bytes saving iteration time in
955
size, bytes = self._data._record_to_data(version_id, digest,
958
# get mixed annotation + content and feed it into the
960
store_lines = self.factory.lower_fulltext(content)
961
size, bytes = self._data._record_to_data(version_id, digest,
964
access_memo = self._data.add_raw_records([size], bytes)[0]
965
self._index.add_versions(
966
((version_id, options, access_memo, parents),),
968
return digest, text_length, content
970
def check(self, progress_bar=None):
971
"""See VersionedFile.check()."""
973
def _clone_text(self, new_version_id, old_version_id, parents):
974
"""See VersionedFile.clone_text()."""
975
# FIXME RBC 20060228 make fast by only inserting an index with null
977
self.add_lines(new_version_id, parents, self.get_lines(old_version_id))
979
def get_lines(self, version_id):
980
"""See VersionedFile.get_lines()."""
981
return self.get_line_list([version_id])[0]
983
def _get_record_map(self, version_ids):
984
"""Produce a dictionary of knit records.
986
The keys are version_ids, the values are tuples of (method, content,
988
method is the way the content should be applied.
989
content is a KnitContent object.
990
digest is the SHA1 digest of this version id after all steps are done
991
next is the build-parent of the version, i.e. the leftmost ancestor.
992
If the method is fulltext, next will be None.
994
position_map = self._get_components_positions(version_ids)
995
# c = component_id, m = method, i_m = index_memo, n = next
996
records = [(c, i_m) for c, (m, i_m, n) in position_map.iteritems()]
998
for component_id, content, digest in \
999
self._data.read_records_iter(records):
1000
method, index_memo, next = position_map[component_id]
1001
record_map[component_id] = method, content, digest, next
1005
def get_text(self, version_id):
1006
"""See VersionedFile.get_text"""
1007
return self.get_texts([version_id])[0]
1009
def get_texts(self, version_ids):
1010
return [''.join(l) for l in self.get_line_list(version_ids)]
1012
def get_line_list(self, version_ids):
1013
"""Return the texts of listed versions as a list of strings."""
1014
for version_id in version_ids:
1015
self.check_not_reserved_id(version_id)
1016
text_map, content_map = self._get_content_maps(version_ids)
1017
return [text_map[v] for v in version_ids]
1019
_get_lf_split_line_list = get_line_list
1021
def _get_content_maps(self, version_ids):
1022
"""Produce maps of text and KnitContents
1024
:return: (text_map, content_map) where text_map contains the texts for
1025
the requested versions and content_map contains the KnitContents.
1026
Both dicts take version_ids as their keys.
1028
# FUTURE: This function could be improved for the 'extract many' case
1029
# by tracking each component and only doing the copy when the number of
1030
# children than need to apply delta's to it is > 1 or it is part of the
1032
version_ids = list(version_ids)
1033
multiple_versions = len(version_ids) != 1
1034
record_map = self._get_record_map(version_ids)
1039
for version_id in version_ids:
1042
while cursor is not None:
1043
method, data, digest, next = record_map[cursor]
1044
components.append((cursor, method, data, digest))
1045
if cursor in content_map:
1050
for component_id, method, data, digest in reversed(components):
1051
if component_id in content_map:
1052
content = content_map[component_id]
1054
if method == 'fulltext':
1055
assert content is None
1056
content = self.factory.parse_fulltext(data, version_id)
1057
elif method == 'line-delta':
1058
delta = self.factory.parse_line_delta(data, version_id)
1059
if multiple_versions:
1060
# only doing this when we want multiple versions
1061
# output avoids list copies - which reference and
1062
# dereference many strings.
1063
content = content.copy()
1064
content.apply_delta(delta, version_id)
1065
if multiple_versions:
1066
content_map[component_id] = content
1068
if 'no-eol' in self._index.get_options(version_id):
1069
if multiple_versions:
1070
content = content.copy()
1071
content.strip_last_line_newline()
1072
final_content[version_id] = content
1074
# digest here is the digest from the last applied component.
1075
text = content.text()
1076
actual_sha = sha_strings(text)
1077
if actual_sha != digest:
1078
raise KnitCorrupt(self.filename,
1080
'\n of reconstructed text does not match'
1082
'\n for version %s' %
1083
(actual_sha, digest, version_id))
1084
text_map[version_id] = text
1085
return text_map, final_content
1087
def iter_lines_added_or_present_in_versions(self, version_ids=None,
1089
"""See VersionedFile.iter_lines_added_or_present_in_versions()."""
1090
if version_ids is None:
1091
version_ids = self.versions()
1093
pb = progress.DummyProgress()
1094
# we don't care about inclusions, the caller cares.
1095
# but we need to setup a list of records to visit.
1096
# we need version_id, position, length
1097
version_id_records = []
1098
requested_versions = set(version_ids)
1099
# filter for available versions
1100
for version_id in requested_versions:
1101
if not self.has_version(version_id):
1102
raise RevisionNotPresent(version_id, self.filename)
1103
# get a in-component-order queue:
1104
for version_id in self.versions():
1105
if version_id in requested_versions:
1106
index_memo = self._index.get_position(version_id)
1107
version_id_records.append((version_id, index_memo))
1109
total = len(version_id_records)
1110
for version_idx, (version_id, data, sha_value) in \
1111
enumerate(self._data.read_records_iter(version_id_records)):
1112
pb.update('Walking content.', version_idx, total)
1113
method = self._index.get_method(version_id)
1115
assert method in ('fulltext', 'line-delta')
1116
if method == 'fulltext':
1117
line_iterator = self.factory.get_fulltext_content(data)
1119
line_iterator = self.factory.get_linedelta_content(data)
1120
for line in line_iterator:
1123
pb.update('Walking content.', total, total)
1125
def iter_parents(self, version_ids):
1126
"""Iterate through the parents for many version ids.
1128
:param version_ids: An iterable yielding version_ids.
1129
:return: An iterator that yields (version_id, parents). Requested
1130
version_ids not present in the versioned file are simply skipped.
1131
The order is undefined, allowing for different optimisations in
1132
the underlying implementation.
1134
return self._index.iter_parents(version_ids)
1136
def num_versions(self):
1137
"""See VersionedFile.num_versions()."""
1138
return self._index.num_versions()
1140
__len__ = num_versions
1142
def annotate_iter(self, version_id):
1143
"""See VersionedFile.annotate_iter."""
1144
return self.factory.annotate_iter(self, version_id)
1146
def get_parents(self, version_id):
1147
"""See VersionedFile.get_parents."""
1150
# 52554 calls in 1264 872 internal down from 3674
1152
return self._index.get_parents(version_id)
1154
raise RevisionNotPresent(version_id, self.filename)
1156
def get_parents_with_ghosts(self, version_id):
1157
"""See VersionedFile.get_parents."""
1159
return self._index.get_parents_with_ghosts(version_id)
1161
raise RevisionNotPresent(version_id, self.filename)
1163
def get_ancestry(self, versions, topo_sorted=True):
1164
"""See VersionedFile.get_ancestry."""
1165
if isinstance(versions, basestring):
1166
versions = [versions]
1169
return self._index.get_ancestry(versions, topo_sorted)
1171
def get_ancestry_with_ghosts(self, versions):
1172
"""See VersionedFile.get_ancestry_with_ghosts."""
1173
if isinstance(versions, basestring):
1174
versions = [versions]
1177
return self._index.get_ancestry_with_ghosts(versions)
1179
def plan_merge(self, ver_a, ver_b):
1180
"""See VersionedFile.plan_merge."""
1181
ancestors_b = set(self.get_ancestry(ver_b, topo_sorted=False))
1182
ancestors_a = set(self.get_ancestry(ver_a, topo_sorted=False))
1183
annotated_a = self.annotate(ver_a)
1184
annotated_b = self.annotate(ver_b)
1185
return merge._plan_annotate_merge(annotated_a, annotated_b,
1186
ancestors_a, ancestors_b)
1189
class _KnitComponentFile(object):
1190
"""One of the files used to implement a knit database"""
1192
def __init__(self, transport, filename, mode, file_mode=None,
1193
create_parent_dir=False, dir_mode=None):
1194
self._transport = transport
1195
self._filename = filename
1197
self._file_mode = file_mode
1198
self._dir_mode = dir_mode
1199
self._create_parent_dir = create_parent_dir
1200
self._need_to_create = False
1202
def _full_path(self):
1203
"""Return the full path to this file."""
1204
return self._transport.base + self._filename
1206
def check_header(self, fp):
1207
line = fp.readline()
1209
# An empty file can actually be treated as though the file doesn't
1211
raise errors.NoSuchFile(self._full_path())
1212
if line != self.HEADER:
1213
raise KnitHeaderError(badline=line,
1214
filename=self._transport.abspath(self._filename))
1217
return '%s(%s)' % (self.__class__.__name__, self._filename)
1220
class _KnitIndex(_KnitComponentFile):
1221
"""Manages knit index file.
1223
The index is already kept in memory and read on startup, to enable
1224
fast lookups of revision information. The cursor of the index
1225
file is always pointing to the end, making it easy to append
1228
_cache is a cache for fast mapping from version id to a Index
1231
_history is a cache for fast mapping from indexes to version ids.
1233
The index data format is dictionary compressed when it comes to
1234
parent references; a index entry may only have parents that with a
1235
lover index number. As a result, the index is topological sorted.
1237
Duplicate entries may be written to the index for a single version id
1238
if this is done then the latter one completely replaces the former:
1239
this allows updates to correct version and parent information.
1240
Note that the two entries may share the delta, and that successive
1241
annotations and references MUST point to the first entry.
1243
The index file on disc contains a header, followed by one line per knit
1244
record. The same revision can be present in an index file more than once.
1245
The first occurrence gets assigned a sequence number starting from 0.
1247
The format of a single line is
1248
REVISION_ID FLAGS BYTE_OFFSET LENGTH( PARENT_ID|PARENT_SEQUENCE_ID)* :\n
1249
REVISION_ID is a utf8-encoded revision id
1250
FLAGS is a comma separated list of flags about the record. Values include
1251
no-eol, line-delta, fulltext.
1252
BYTE_OFFSET is the ascii representation of the byte offset in the data file
1253
that the the compressed data starts at.
1254
LENGTH is the ascii representation of the length of the data file.
1255
PARENT_ID a utf-8 revision id prefixed by a '.' that is a parent of
1257
PARENT_SEQUENCE_ID the ascii representation of the sequence number of a
1258
revision id already in the knit that is a parent of REVISION_ID.
1259
The ' :' marker is the end of record marker.
1262
when a write is interrupted to the index file, it will result in a line
1263
that does not end in ' :'. If the ' :' is not present at the end of a line,
1264
or at the end of the file, then the record that is missing it will be
1265
ignored by the parser.
1267
When writing new records to the index file, the data is preceded by '\n'
1268
to ensure that records always start on new lines even if the last write was
1269
interrupted. As a result its normal for the last line in the index to be
1270
missing a trailing newline. One can be added with no harmful effects.
1273
HEADER = "# bzr knit index 8\n"
1275
# speed of knit parsing went from 280 ms to 280 ms with slots addition.
1276
# __slots__ = ['_cache', '_history', '_transport', '_filename']
1278
def _cache_version(self, version_id, options, pos, size, parents):
1279
"""Cache a version record in the history array and index cache.
1281
This is inlined into _load_data for performance. KEEP IN SYNC.
1282
(It saves 60ms, 25% of the __init__ overhead on local 4000 record
1285
# only want the _history index to reference the 1st index entry
1287
if version_id not in self._cache:
1288
index = len(self._history)
1289
self._history.append(version_id)
1291
index = self._cache[version_id][5]
1292
self._cache[version_id] = (version_id,
1299
def __init__(self, transport, filename, mode, create=False, file_mode=None,
1300
create_parent_dir=False, delay_create=False, dir_mode=None):
1301
_KnitComponentFile.__init__(self, transport, filename, mode,
1302
file_mode=file_mode,
1303
create_parent_dir=create_parent_dir,
1306
# position in _history is the 'official' index for a revision
1307
# but the values may have come from a newer entry.
1308
# so - wc -l of a knit index is != the number of unique names
1312
fp = self._transport.get(self._filename)
1314
# _load_data may raise NoSuchFile if the target knit is
1316
_load_data(self, fp)
1320
if mode != 'w' or not create:
1323
self._need_to_create = True
1325
self._transport.put_bytes_non_atomic(
1326
self._filename, self.HEADER, mode=self._file_mode)
1328
def get_graph(self):
1329
"""Return a list of the node:parents lists from this knit index."""
1330
return [(vid, idx[4]) for vid, idx in self._cache.iteritems()]
1332
def get_ancestry(self, versions, topo_sorted=True):
1333
"""See VersionedFile.get_ancestry."""
1334
# get a graph of all the mentioned versions:
1336
pending = set(versions)
1339
version = pending.pop()
1342
parents = [p for p in cache[version][4] if p in cache]
1344
raise RevisionNotPresent(version, self._filename)
1345
# if not completed and not a ghost
1346
pending.update([p for p in parents if p not in graph])
1347
graph[version] = parents
1350
return topo_sort(graph.items())
1352
def get_ancestry_with_ghosts(self, versions):
1353
"""See VersionedFile.get_ancestry_with_ghosts."""
1354
# get a graph of all the mentioned versions:
1355
self.check_versions_present(versions)
1358
pending = set(versions)
1360
version = pending.pop()
1362
parents = cache[version][4]
1368
pending.update([p for p in parents if p not in graph])
1369
graph[version] = parents
1370
return topo_sort(graph.items())
1372
def iter_parents(self, version_ids):
1373
"""Iterate through the parents for many version ids.
1375
:param version_ids: An iterable yielding version_ids.
1376
:return: An iterator that yields (version_id, parents). Requested
1377
version_ids not present in the versioned file are simply skipped.
1378
The order is undefined, allowing for different optimisations in
1379
the underlying implementation.
1381
for version_id in version_ids:
1383
yield version_id, tuple(self.get_parents(version_id))
1387
def num_versions(self):
1388
return len(self._history)
1390
__len__ = num_versions
1392
def get_versions(self):
1393
"""Get all the versions in the file. not topologically sorted."""
1394
return self._history
1396
def _version_list_to_index(self, versions):
1399
for version in versions:
1400
if version in cache:
1401
# -- inlined lookup() --
1402
result_list.append(str(cache[version][5]))
1403
# -- end lookup () --
1405
result_list.append('.' + version)
1406
return ' '.join(result_list)
1408
def add_version(self, version_id, options, index_memo, parents):
1409
"""Add a version record to the index."""
1410
self.add_versions(((version_id, options, index_memo, parents),))
1412
def add_versions(self, versions, random_id=False):
1413
"""Add multiple versions to the index.
1415
:param versions: a list of tuples:
1416
(version_id, options, pos, size, parents).
1417
:param random_id: If True the ids being added were randomly generated
1418
and no check for existence will be performed.
1421
orig_history = self._history[:]
1422
orig_cache = self._cache.copy()
1425
for version_id, options, (index, pos, size), parents in versions:
1426
line = "\n%s %s %s %s %s :" % (version_id,
1430
self._version_list_to_index(parents))
1431
assert isinstance(line, str), \
1432
'content must be utf-8 encoded: %r' % (line,)
1434
self._cache_version(version_id, options, pos, size, parents)
1435
if not self._need_to_create:
1436
self._transport.append_bytes(self._filename, ''.join(lines))
1439
sio.write(self.HEADER)
1440
sio.writelines(lines)
1442
self._transport.put_file_non_atomic(self._filename, sio,
1443
create_parent_dir=self._create_parent_dir,
1444
mode=self._file_mode,
1445
dir_mode=self._dir_mode)
1446
self._need_to_create = False
1448
# If any problems happen, restore the original values and re-raise
1449
self._history = orig_history
1450
self._cache = orig_cache
1453
def has_version(self, version_id):
1454
"""True if the version is in the index."""
1455
return version_id in self._cache
1457
def get_position(self, version_id):
1458
"""Return details needed to access the version.
1460
.kndx indices do not support split-out data, so return None for the
1463
:return: a tuple (None, data position, size) to hand to the access
1464
logic to get the record.
1466
entry = self._cache[version_id]
1467
return None, entry[2], entry[3]
1469
def get_method(self, version_id):
1470
"""Return compression method of specified version."""
1472
options = self._cache[version_id][1]
1474
raise RevisionNotPresent(version_id, self._filename)
1475
if 'fulltext' in options:
1478
if 'line-delta' not in options:
1479
raise errors.KnitIndexUnknownMethod(self._full_path(), options)
1482
def get_options(self, version_id):
1483
"""Return a string represention options.
1487
return self._cache[version_id][1]
1489
def get_parents(self, version_id):
1490
"""Return parents of specified version ignoring ghosts."""
1491
return [parent for parent in self._cache[version_id][4]
1492
if parent in self._cache]
1494
def get_parents_with_ghosts(self, version_id):
1495
"""Return parents of specified version with ghosts."""
1496
return self._cache[version_id][4]
1498
def check_versions_present(self, version_ids):
1499
"""Check that all specified versions are present."""
1501
for version_id in version_ids:
1502
if version_id not in cache:
1503
raise RevisionNotPresent(version_id, self._filename)
1506
class KnitGraphIndex(object):
1507
"""A knit index that builds on GraphIndex."""
1509
def __init__(self, graph_index, deltas=False, parents=True, add_callback=None):
1510
"""Construct a KnitGraphIndex on a graph_index.
1512
:param graph_index: An implementation of bzrlib.index.GraphIndex.
1513
:param deltas: Allow delta-compressed records.
1514
:param add_callback: If not None, allow additions to the index and call
1515
this callback with a list of added GraphIndex nodes:
1516
[(node, value, node_refs), ...]
1517
:param parents: If True, record knits parents, if not do not record
1520
self._graph_index = graph_index
1521
self._deltas = deltas
1522
self._add_callback = add_callback
1523
self._parents = parents
1524
if deltas and not parents:
1525
raise KnitCorrupt(self, "Cannot do delta compression without "
1528
def _get_entries(self, keys, check_present=False):
1529
"""Get the entries for keys.
1531
:param keys: An iterable of index keys, - 1-tuples.
1536
for node in self._graph_index.iter_entries(keys):
1538
found_keys.add(node[1])
1540
# adapt parentless index to the rest of the code.
1541
for node in self._graph_index.iter_entries(keys):
1542
yield node[0], node[1], node[2], ()
1543
found_keys.add(node[1])
1545
missing_keys = keys.difference(found_keys)
1547
raise RevisionNotPresent(missing_keys.pop(), self)
1549
def _present_keys(self, version_ids):
1551
node[1] for node in self._get_entries(version_ids)])
1553
def _parentless_ancestry(self, versions):
1554
"""Honour the get_ancestry API for parentless knit indices."""
1555
wanted_keys = self._version_ids_to_keys(versions)
1556
present_keys = self._present_keys(wanted_keys)
1557
missing = set(wanted_keys).difference(present_keys)
1559
raise RevisionNotPresent(missing.pop(), self)
1560
return list(self._keys_to_version_ids(present_keys))
1562
def get_ancestry(self, versions, topo_sorted=True):
1563
"""See VersionedFile.get_ancestry."""
1564
if not self._parents:
1565
return self._parentless_ancestry(versions)
1566
# XXX: This will do len(history) index calls - perhaps
1567
# it should be altered to be a index core feature?
1568
# get a graph of all the mentioned versions:
1571
versions = self._version_ids_to_keys(versions)
1572
pending = set(versions)
1574
# get all pending nodes
1575
this_iteration = pending
1576
new_nodes = self._get_entries(this_iteration)
1579
for (index, key, value, node_refs) in new_nodes:
1580
# dont ask for ghosties - otherwise
1581
# we we can end up looping with pending
1582
# being entirely ghosted.
1583
graph[key] = [parent for parent in node_refs[0]
1584
if parent not in ghosts]
1586
for parent in graph[key]:
1587
# dont examine known nodes again
1592
ghosts.update(this_iteration.difference(found))
1593
if versions.difference(graph):
1594
raise RevisionNotPresent(versions.difference(graph).pop(), self)
1596
result_keys = topo_sort(graph.items())
1598
result_keys = graph.iterkeys()
1599
return [key[0] for key in result_keys]
1601
def get_ancestry_with_ghosts(self, versions):
1602
"""See VersionedFile.get_ancestry."""
1603
if not self._parents:
1604
return self._parentless_ancestry(versions)
1605
# XXX: This will do len(history) index calls - perhaps
1606
# it should be altered to be a index core feature?
1607
# get a graph of all the mentioned versions:
1609
versions = self._version_ids_to_keys(versions)
1610
pending = set(versions)
1612
# get all pending nodes
1613
this_iteration = pending
1614
new_nodes = self._get_entries(this_iteration)
1616
for (index, key, value, node_refs) in new_nodes:
1617
graph[key] = node_refs[0]
1619
for parent in graph[key]:
1620
# dont examine known nodes again
1624
missing_versions = this_iteration.difference(graph)
1625
missing_needed = versions.intersection(missing_versions)
1627
raise RevisionNotPresent(missing_needed.pop(), self)
1628
for missing_version in missing_versions:
1629
# add a key, no parents
1630
graph[missing_version] = []
1631
pending.discard(missing_version) # don't look for it
1632
result_keys = topo_sort(graph.items())
1633
return [key[0] for key in result_keys]
1635
def get_graph(self):
1636
"""Return a list of the node:parents lists from this knit index."""
1637
if not self._parents:
1638
return [(key, ()) for key in self.get_versions()]
1640
for index, key, value, refs in self._graph_index.iter_all_entries():
1641
result.append((key[0], tuple([ref[0] for ref in refs[0]])))
1644
def iter_parents(self, version_ids):
1645
"""Iterate through the parents for many version ids.
1647
:param version_ids: An iterable yielding version_ids.
1648
:return: An iterator that yields (version_id, parents). Requested
1649
version_ids not present in the versioned file are simply skipped.
1650
The order is undefined, allowing for different optimisations in
1651
the underlying implementation.
1654
all_nodes = set(self._get_entries(self._version_ids_to_keys(version_ids)))
1656
present_parents = set()
1657
for node in all_nodes:
1658
all_parents.update(node[3][0])
1659
# any node we are querying must be present
1660
present_parents.add(node[1])
1661
unknown_parents = all_parents.difference(present_parents)
1662
present_parents.update(self._present_keys(unknown_parents))
1663
for node in all_nodes:
1665
for parent in node[3][0]:
1666
if parent in present_parents:
1667
parents.append(parent[0])
1668
yield node[1][0], tuple(parents)
1670
for node in self._get_entries(self._version_ids_to_keys(version_ids)):
1671
yield node[1][0], ()
1673
def num_versions(self):
1674
return len(list(self._graph_index.iter_all_entries()))
1676
__len__ = num_versions
1678
def get_versions(self):
1679
"""Get all the versions in the file. not topologically sorted."""
1680
return [node[1][0] for node in self._graph_index.iter_all_entries()]
1682
def has_version(self, version_id):
1683
"""True if the version is in the index."""
1684
return len(self._present_keys(self._version_ids_to_keys([version_id]))) == 1
1686
def _keys_to_version_ids(self, keys):
1687
return tuple(key[0] for key in keys)
1689
def get_position(self, version_id):
1690
"""Return details needed to access the version.
1692
:return: a tuple (index, data position, size) to hand to the access
1693
logic to get the record.
1695
node = self._get_node(version_id)
1696
bits = node[2][1:].split(' ')
1697
return node[0], int(bits[0]), int(bits[1])
1699
def get_method(self, version_id):
1700
"""Return compression method of specified version."""
1701
if not self._deltas:
1703
return self._parent_compression(self._get_node(version_id)[3][1])
1705
def _parent_compression(self, reference_list):
1706
# use the second reference list to decide if this is delta'd or not.
1707
if len(reference_list):
1712
def _get_node(self, version_id):
1714
return list(self._get_entries(self._version_ids_to_keys([version_id])))[0]
1716
raise RevisionNotPresent(version_id, self)
1718
def get_options(self, version_id):
1719
"""Return a string represention options.
1723
node = self._get_node(version_id)
1724
if not self._deltas:
1725
options = ['fulltext']
1727
options = [self._parent_compression(node[3][1])]
1728
if node[2][0] == 'N':
1729
options.append('no-eol')
1732
def get_parents(self, version_id):
1733
"""Return parents of specified version ignoring ghosts."""
1734
parents = list(self.iter_parents([version_id]))
1737
raise errors.RevisionNotPresent(version_id, self)
1738
return parents[0][1]
1740
def get_parents_with_ghosts(self, version_id):
1741
"""Return parents of specified version with ghosts."""
1742
nodes = list(self._get_entries(self._version_ids_to_keys([version_id]),
1743
check_present=True))
1744
if not self._parents:
1746
return self._keys_to_version_ids(nodes[0][3][0])
1748
def check_versions_present(self, version_ids):
1749
"""Check that all specified versions are present."""
1750
keys = self._version_ids_to_keys(version_ids)
1751
present = self._present_keys(keys)
1752
missing = keys.difference(present)
1754
raise RevisionNotPresent(missing.pop(), self)
1756
def add_version(self, version_id, options, access_memo, parents):
1757
"""Add a version record to the index."""
1758
return self.add_versions(((version_id, options, access_memo, parents),))
1760
def add_versions(self, versions, random_id=False):
1761
"""Add multiple versions to the index.
1763
This function does not insert data into the Immutable GraphIndex
1764
backing the KnitGraphIndex, instead it prepares data for insertion by
1765
the caller and checks that it is safe to insert then calls
1766
self._add_callback with the prepared GraphIndex nodes.
1768
:param versions: a list of tuples:
1769
(version_id, options, pos, size, parents).
1770
:param random_id: If True the ids being added were randomly generated
1771
and no check for existence will be performed.
1773
if not self._add_callback:
1774
raise errors.ReadOnlyError(self)
1775
# we hope there are no repositories with inconsistent parentage
1780
for (version_id, options, access_memo, parents) in versions:
1781
index, pos, size = access_memo
1782
key = (version_id, )
1783
parents = tuple((parent, ) for parent in parents)
1784
if 'no-eol' in options:
1788
value += "%d %d" % (pos, size)
1789
if not self._deltas:
1790
if 'line-delta' in options:
1791
raise KnitCorrupt(self, "attempt to add line-delta in non-delta knit")
1794
if 'line-delta' in options:
1795
node_refs = (parents, (parents[0],))
1797
node_refs = (parents, ())
1799
node_refs = (parents, )
1802
raise KnitCorrupt(self, "attempt to add node with parents "
1803
"in parentless index.")
1805
keys[key] = (value, node_refs)
1807
present_nodes = self._get_entries(keys)
1808
for (index, key, value, node_refs) in present_nodes:
1809
if (value, node_refs) != keys[key]:
1810
raise KnitCorrupt(self, "inconsistent details in add_versions"
1811
": %s %s" % ((value, node_refs), keys[key]))
1815
for key, (value, node_refs) in keys.iteritems():
1816
result.append((key, value, node_refs))
1818
for key, (value, node_refs) in keys.iteritems():
1819
result.append((key, value))
1820
self._add_callback(result)
1822
def _version_ids_to_keys(self, version_ids):
1823
return set((version_id, ) for version_id in version_ids)
1826
class _KnitAccess(object):
1827
"""Access to knit records in a .knit file."""
1829
def __init__(self, transport, filename, _file_mode, _dir_mode,
1830
_need_to_create, _create_parent_dir):
1831
"""Create a _KnitAccess for accessing and inserting data.
1833
:param transport: The transport the .knit is located on.
1834
:param filename: The filename of the .knit.
1836
self._transport = transport
1837
self._filename = filename
1838
self._file_mode = _file_mode
1839
self._dir_mode = _dir_mode
1840
self._need_to_create = _need_to_create
1841
self._create_parent_dir = _create_parent_dir
1843
def add_raw_records(self, sizes, raw_data):
1844
"""Add raw knit bytes to a storage area.
1846
The data is spooled to whereever the access method is storing data.
1848
:param sizes: An iterable containing the size of each raw data segment.
1849
:param raw_data: A bytestring containing the data.
1850
:return: A list of memos to retrieve the record later. Each memo is a
1851
tuple - (index, pos, length), where the index field is always None
1852
for the .knit access method.
1854
assert type(raw_data) == str, \
1855
'data must be plain bytes was %s' % type(raw_data)
1856
if not self._need_to_create:
1857
base = self._transport.append_bytes(self._filename, raw_data)
1859
self._transport.put_bytes_non_atomic(self._filename, raw_data,
1860
create_parent_dir=self._create_parent_dir,
1861
mode=self._file_mode,
1862
dir_mode=self._dir_mode)
1863
self._need_to_create = False
1867
result.append((None, base, size))
1872
"""IFF this data access has its own storage area, initialise it.
1876
self._transport.put_bytes_non_atomic(self._filename, '',
1877
mode=self._file_mode)
1879
def open_file(self):
1880
"""IFF this data access can be represented as a single file, open it.
1882
For knits that are not mapped to a single file on disk this will
1885
:return: None or a file handle.
1888
return self._transport.get(self._filename)
1893
def get_raw_records(self, memos_for_retrieval):
1894
"""Get the raw bytes for a records.
1896
:param memos_for_retrieval: An iterable containing the (index, pos,
1897
length) memo for retrieving the bytes. The .knit method ignores
1898
the index as there is always only a single file.
1899
:return: An iterator over the bytes of the records.
1901
read_vector = [(pos, size) for (index, pos, size) in memos_for_retrieval]
1902
for pos, data in self._transport.readv(self._filename, read_vector):
1906
class _PackAccess(object):
1907
"""Access to knit records via a collection of packs."""
1909
def __init__(self, index_to_packs, writer=None):
1910
"""Create a _PackAccess object.
1912
:param index_to_packs: A dict mapping index objects to the transport
1913
and file names for obtaining data.
1914
:param writer: A tuple (pack.ContainerWriter, write_index) which
1915
contains the pack to write, and the index that reads from it will
1919
self.container_writer = writer[0]
1920
self.write_index = writer[1]
1922
self.container_writer = None
1923
self.write_index = None
1924
self.indices = index_to_packs
1926
def add_raw_records(self, sizes, raw_data):
1927
"""Add raw knit bytes to a storage area.
1929
The data is spooled to the container writer in one bytes-record per
1932
:param sizes: An iterable containing the size of each raw data segment.
1933
:param raw_data: A bytestring containing the data.
1934
:return: A list of memos to retrieve the record later. Each memo is a
1935
tuple - (index, pos, length), where the index field is the
1936
write_index object supplied to the PackAccess object.
1938
assert type(raw_data) == str, \
1939
'data must be plain bytes was %s' % type(raw_data)
1943
p_offset, p_length = self.container_writer.add_bytes_record(
1944
raw_data[offset:offset+size], [])
1946
result.append((self.write_index, p_offset, p_length))
1950
"""Pack based knits do not get individually created."""
1952
def get_raw_records(self, memos_for_retrieval):
1953
"""Get the raw bytes for a records.
1955
:param memos_for_retrieval: An iterable containing the (index, pos,
1956
length) memo for retrieving the bytes. The Pack access method
1957
looks up the pack to use for a given record in its index_to_pack
1959
:return: An iterator over the bytes of the records.
1961
# first pass, group into same-index requests
1963
current_index = None
1964
for (index, offset, length) in memos_for_retrieval:
1965
if current_index == index:
1966
current_list.append((offset, length))
1968
if current_index is not None:
1969
request_lists.append((current_index, current_list))
1970
current_index = index
1971
current_list = [(offset, length)]
1972
# handle the last entry
1973
if current_index is not None:
1974
request_lists.append((current_index, current_list))
1975
for index, offsets in request_lists:
1976
transport, path = self.indices[index]
1977
reader = pack.make_readv_reader(transport, path, offsets)
1978
for names, read_func in reader.iter_records():
1979
yield read_func(None)
1981
def open_file(self):
1982
"""Pack based knits have no single file."""
1985
def set_writer(self, writer, index, (transport, packname)):
1986
"""Set a writer to use for adding data."""
1987
if index is not None:
1988
self.indices[index] = (transport, packname)
1989
self.container_writer = writer
1990
self.write_index = index
1993
class _KnitData(object):
1994
"""Manage extraction of data from a KnitAccess, caching and decompressing.
1996
The KnitData class provides the logic for parsing and using knit records,
1997
making use of an access method for the low level read and write operations.
2000
def __init__(self, access):
2001
"""Create a KnitData object.
2003
:param access: The access method to use. Access methods such as
2004
_KnitAccess manage the insertion of raw records and the subsequent
2005
retrieval of the same.
2007
self._access = access
2008
self._checked = False
2009
# TODO: jam 20060713 conceptually, this could spill to disk
2010
# if the cached size gets larger than a certain amount
2011
# but it complicates the model a bit, so for now just use
2012
# a simple dictionary
2014
self._do_cache = False
2016
def enable_cache(self):
2017
"""Enable caching of reads."""
2018
self._do_cache = True
2020
def clear_cache(self):
2021
"""Clear the record cache."""
2022
self._do_cache = False
2025
def _open_file(self):
2026
return self._access.open_file()
2028
def _record_to_data(self, version_id, digest, lines, dense_lines=None):
2029
"""Convert version_id, digest, lines into a raw data block.
2031
:param dense_lines: The bytes of lines but in a denser form. For
2032
instance, if lines is a list of 1000 bytestrings each ending in \n,
2033
dense_lines may be a list with one line in it, containing all the
2034
1000's lines and their \n's. Using dense_lines if it is already
2035
known is a win because the string join to create bytes in this
2036
function spends less time resizing the final string.
2037
:return: (len, a StringIO instance with the raw data ready to read.)
2039
# Note: using a string copy here increases memory pressure with e.g.
2040
# ISO's, but it is about 3 seconds faster on a 1.2Ghz intel machine
2041
# when doing the initial commit of a mozilla tree. RBC 20070921
2042
bytes = ''.join(chain(
2043
["version %s %d %s\n" % (version_id,
2046
dense_lines or lines,
2047
["end %s\n" % version_id]))
2048
assert bytes.__class__ == str
2049
compressed_bytes = bytes_to_gzip(bytes)
2050
return len(compressed_bytes), compressed_bytes
2052
def add_raw_records(self, sizes, raw_data):
2053
"""Append a prepared record to the data file.
2055
:param sizes: An iterable containing the size of each raw data segment.
2056
:param raw_data: A bytestring containing the data.
2057
:return: a list of index data for the way the data was stored.
2058
See the access method add_raw_records documentation for more
2061
return self._access.add_raw_records(sizes, raw_data)
2063
def _parse_record_header(self, version_id, raw_data):
2064
"""Parse a record header for consistency.
2066
:return: the header and the decompressor stream.
2067
as (stream, header_record)
2069
df = GzipFile(mode='rb', fileobj=StringIO(raw_data))
2071
rec = self._check_header(version_id, df.readline())
2072
except Exception, e:
2073
raise KnitCorrupt(self._access,
2074
"While reading {%s} got %s(%s)"
2075
% (version_id, e.__class__.__name__, str(e)))
2078
def _check_header(self, version_id, line):
2081
raise KnitCorrupt(self._access,
2082
'unexpected number of elements in record header')
2083
if rec[1] != version_id:
2084
raise KnitCorrupt(self._access,
2085
'unexpected version, wanted %r, got %r'
2086
% (version_id, rec[1]))
2089
def _parse_record(self, version_id, data):
2091
# 4168 calls in 2880 217 internal
2092
# 4168 calls to _parse_record_header in 2121
2093
# 4168 calls to readlines in 330
2094
df = GzipFile(mode='rb', fileobj=StringIO(data))
2097
record_contents = df.readlines()
2098
except Exception, e:
2099
raise KnitCorrupt(self._access,
2100
"While reading {%s} got %s(%s)"
2101
% (version_id, e.__class__.__name__, str(e)))
2102
header = record_contents.pop(0)
2103
rec = self._check_header(version_id, header)
2105
last_line = record_contents.pop()
2106
if len(record_contents) != int(rec[2]):
2107
raise KnitCorrupt(self._access,
2108
'incorrect number of lines %s != %s'
2110
% (len(record_contents), int(rec[2]),
2112
if last_line != 'end %s\n' % rec[1]:
2113
raise KnitCorrupt(self._access,
2114
'unexpected version end line %r, wanted %r'
2115
% (last_line, version_id))
2117
return record_contents, rec[3]
2119
def read_records_iter_raw(self, records):
2120
"""Read text records from data file and yield raw data.
2122
This unpacks enough of the text record to validate the id is
2123
as expected but thats all.
2125
# setup an iterator of the external records:
2126
# uses readv so nice and fast we hope.
2128
# grab the disk data needed.
2130
# Don't check _cache if it is empty
2131
needed_offsets = [index_memo for version_id, index_memo
2133
if version_id not in self._cache]
2135
needed_offsets = [index_memo for version_id, index_memo
2138
raw_records = self._access.get_raw_records(needed_offsets)
2140
for version_id, index_memo in records:
2141
if version_id in self._cache:
2142
# This data has already been validated
2143
data = self._cache[version_id]
2145
data = raw_records.next()
2147
self._cache[version_id] = data
2149
# validate the header
2150
df, rec = self._parse_record_header(version_id, data)
2152
yield version_id, data
2154
def read_records_iter(self, records):
2155
"""Read text records from data file and yield result.
2157
The result will be returned in whatever is the fastest to read.
2158
Not by the order requested. Also, multiple requests for the same
2159
record will only yield 1 response.
2160
:param records: A list of (version_id, pos, len) entries
2161
:return: Yields (version_id, contents, digest) in the order
2162
read, not the order requested
2168
# Skip records we have alread seen
2169
yielded_records = set()
2170
needed_records = set()
2171
for record in records:
2172
if record[0] in self._cache:
2173
if record[0] in yielded_records:
2175
yielded_records.add(record[0])
2176
data = self._cache[record[0]]
2177
content, digest = self._parse_record(record[0], data)
2178
yield (record[0], content, digest)
2180
needed_records.add(record)
2181
needed_records = sorted(needed_records, key=operator.itemgetter(1))
2183
needed_records = sorted(set(records), key=operator.itemgetter(1))
2185
if not needed_records:
2188
# The transport optimizes the fetching as well
2189
# (ie, reads continuous ranges.)
2190
raw_data = self._access.get_raw_records(
2191
[index_memo for version_id, index_memo in needed_records])
2193
for (version_id, index_memo), data in \
2194
izip(iter(needed_records), raw_data):
2195
content, digest = self._parse_record(version_id, data)
2197
self._cache[version_id] = data
2198
yield version_id, content, digest
2200
def read_records(self, records):
2201
"""Read records into a dictionary."""
2203
for record_id, content, digest in \
2204
self.read_records_iter(records):
2205
components[record_id] = (content, digest)
2209
class InterKnit(InterVersionedFile):
2210
"""Optimised code paths for knit to knit operations."""
2212
_matching_file_from_factory = KnitVersionedFile
2213
_matching_file_to_factory = KnitVersionedFile
2216
def is_compatible(source, target):
2217
"""Be compatible with knits. """
2219
return (isinstance(source, KnitVersionedFile) and
2220
isinstance(target, KnitVersionedFile))
2221
except AttributeError:
2224
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
2225
"""See InterVersionedFile.join."""
2226
assert isinstance(self.source, KnitVersionedFile)
2227
assert isinstance(self.target, KnitVersionedFile)
2229
# If the source and target are mismatched w.r.t. annotations vs
2230
# plain, the data needs to be converted accordingly
2231
if self.source.factory.annotated == self.target.factory.annotated:
2233
elif self.source.factory.annotated:
2234
converter = self._anno_to_plain_converter
2236
# We're converting from a plain to an annotated knit. This requires
2237
# building the annotations from scratch. The generic join code
2238
# handles this implicitly so we delegate to it.
2239
return super(InterKnit, self).join(pb, msg, version_ids,
2242
version_ids = self._get_source_version_ids(version_ids, ignore_missing)
2246
pb = ui.ui_factory.nested_progress_bar()
2248
version_ids = list(version_ids)
2249
if None in version_ids:
2250
version_ids.remove(None)
2252
self.source_ancestry = set(self.source.get_ancestry(version_ids))
2253
this_versions = set(self.target._index.get_versions())
2254
# XXX: For efficiency we should not look at the whole index,
2255
# we only need to consider the referenced revisions - they
2256
# must all be present, or the method must be full-text.
2257
# TODO, RBC 20070919
2258
needed_versions = self.source_ancestry - this_versions
2260
if not needed_versions:
2262
full_list = topo_sort(self.source.get_graph())
2264
version_list = [i for i in full_list if (not self.target.has_version(i)
2265
and i in needed_versions)]
2269
copy_queue_records = []
2271
for version_id in version_list:
2272
options = self.source._index.get_options(version_id)
2273
parents = self.source._index.get_parents_with_ghosts(version_id)
2274
# check that its will be a consistent copy:
2275
for parent in parents:
2276
# if source has the parent, we must :
2277
# * already have it or
2278
# * have it scheduled already
2279
# otherwise we don't care
2280
assert (self.target.has_version(parent) or
2281
parent in copy_set or
2282
not self.source.has_version(parent))
2283
index_memo = self.source._index.get_position(version_id)
2284
copy_queue_records.append((version_id, index_memo))
2285
copy_queue.append((version_id, options, parents))
2286
copy_set.add(version_id)
2288
# data suck the join:
2290
total = len(version_list)
2293
for (version_id, raw_data), \
2294
(version_id2, options, parents) in \
2295
izip(self.source._data.read_records_iter_raw(copy_queue_records),
2297
assert version_id == version_id2, 'logic error, inconsistent results'
2299
pb.update("Joining knit", count, total)
2301
size, raw_data = converter(raw_data, version_id, options,
2304
size = len(raw_data)
2305
raw_records.append((version_id, options, parents, size))
2306
raw_datum.append(raw_data)
2307
self.target._add_raw_records(raw_records, ''.join(raw_datum))
2312
def _anno_to_plain_converter(self, raw_data, version_id, options,
2314
"""Convert annotated content to plain content."""
2315
data, digest = self.source._data._parse_record(version_id, raw_data)
2316
if 'fulltext' in options:
2317
content = self.source.factory.parse_fulltext(data, version_id)
2318
lines = self.target.factory.lower_fulltext(content)
2320
delta = self.source.factory.parse_line_delta(data, version_id,
2322
lines = self.target.factory.lower_line_delta(delta)
2323
return self.target._data._record_to_data(version_id, digest, lines)
2326
InterVersionedFile.register_optimiser(InterKnit)
2329
class WeaveToKnit(InterVersionedFile):
2330
"""Optimised code paths for weave to knit operations."""
2332
_matching_file_from_factory = bzrlib.weave.WeaveFile
2333
_matching_file_to_factory = KnitVersionedFile
2336
def is_compatible(source, target):
2337
"""Be compatible with weaves to knits."""
2339
return (isinstance(source, bzrlib.weave.Weave) and
2340
isinstance(target, KnitVersionedFile))
2341
except AttributeError:
2344
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
2345
"""See InterVersionedFile.join."""
2346
assert isinstance(self.source, bzrlib.weave.Weave)
2347
assert isinstance(self.target, KnitVersionedFile)
2349
version_ids = self._get_source_version_ids(version_ids, ignore_missing)
2354
pb = ui.ui_factory.nested_progress_bar()
2356
version_ids = list(version_ids)
2358
self.source_ancestry = set(self.source.get_ancestry(version_ids))
2359
this_versions = set(self.target._index.get_versions())
2360
needed_versions = self.source_ancestry - this_versions
2362
if not needed_versions:
2364
full_list = topo_sort(self.source.get_graph())
2366
version_list = [i for i in full_list if (not self.target.has_version(i)
2367
and i in needed_versions)]
2371
total = len(version_list)
2372
for version_id in version_list:
2373
pb.update("Converting to knit", count, total)
2374
parents = self.source.get_parents(version_id)
2375
# check that its will be a consistent copy:
2376
for parent in parents:
2377
# if source has the parent, we must already have it
2378
assert (self.target.has_version(parent))
2379
self.target.add_lines(
2380
version_id, parents, self.source.get_lines(version_id))
2387
InterVersionedFile.register_optimiser(WeaveToKnit)
2390
# Deprecated, use PatienceSequenceMatcher instead
2391
KnitSequenceMatcher = patiencediff.PatienceSequenceMatcher
2394
def annotate_knit(knit, revision_id):
2395
"""Annotate a knit with no cached annotations.
2397
This implementation is for knits with no cached annotations.
2398
It will work for knits with cached annotations, but this is not
2401
ancestry = knit.get_ancestry(revision_id)
2402
fulltext = dict(zip(ancestry, knit.get_line_list(ancestry)))
2404
for candidate in ancestry:
2405
if candidate in annotations:
2407
parents = knit.get_parents(candidate)
2408
if len(parents) == 0:
2410
elif knit._index.get_method(candidate) != 'line-delta':
2413
parent, sha1, noeol, delta = knit.get_delta(candidate)
2414
blocks = KnitContent.get_line_delta_blocks(delta,
2415
fulltext[parents[0]], fulltext[candidate])
2416
annotations[candidate] = list(annotate.reannotate([annotations[p]
2417
for p in parents], fulltext[candidate], candidate, blocks))
2418
return iter(annotations[revision_id])
2422
from bzrlib._knit_load_data_c import _load_data_c as _load_data
2424
from bzrlib._knit_load_data_py import _load_data_py as _load_data
added
removed
bzrlib/knit.py
