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# Copyright (C) 2005, 2006 Canonical Ltd
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# Johan Rydberg <jrydberg@gnu.org>
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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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"""Versioned text file storage api."""
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from cStringIO import StringIO
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from zlib import adler32
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from bzrlib.graph import DictParentsProvider, Graph, _StackedParentsProvider
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from bzrlib.transport.memory import MemoryTransport
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from bzrlib.inter import InterObject
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from bzrlib.registry import Registry
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from bzrlib.symbol_versioning import *
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from bzrlib.textmerge import TextMerge
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adapter_registry = Registry()
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adapter_registry.register_lazy(('knit-delta-gz', 'fulltext'), 'bzrlib.knit',
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'DeltaPlainToFullText')
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adapter_registry.register_lazy(('knit-ft-gz', 'fulltext'), 'bzrlib.knit',
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adapter_registry.register_lazy(('knit-annotated-delta-gz', 'knit-delta-gz'),
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'bzrlib.knit', 'DeltaAnnotatedToUnannotated')
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adapter_registry.register_lazy(('knit-annotated-delta-gz', 'fulltext'),
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'bzrlib.knit', 'DeltaAnnotatedToFullText')
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adapter_registry.register_lazy(('knit-annotated-ft-gz', 'knit-ft-gz'),
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'bzrlib.knit', 'FTAnnotatedToUnannotated')
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adapter_registry.register_lazy(('knit-annotated-ft-gz', 'fulltext'),
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'bzrlib.knit', 'FTAnnotatedToFullText')
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class ContentFactory(object):
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"""Abstract interface for insertion and retrieval from a VersionedFile.
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:ivar sha1: None, or the sha1 of the content fulltext.
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:ivar storage_kind: The native storage kind of this factory. One of
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'mpdiff', 'knit-annotated-ft', 'knit-annotated-delta', 'knit-ft',
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'knit-delta', 'fulltext', 'knit-annotated-ft-gz',
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'knit-annotated-delta-gz', 'knit-ft-gz', 'knit-delta-gz'.
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:ivar key: The key of this content. Each key is a tuple with a single
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:ivar parents: A tuple of parent keys for self.key. If the object has
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no parent information, None (as opposed to () for an empty list of
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"""Create a ContentFactory."""
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self.storage_kind = None
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class FulltextContentFactory(ContentFactory):
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"""Static data content factory.
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This takes a fulltext when created and just returns that during
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get_bytes_as('fulltext').
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:ivar sha1: None, or the sha1 of the content fulltext.
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:ivar storage_kind: The native storage kind of this factory. Always
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:ivar key: The key of this content. Each key is a tuple with a single
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:ivar parents: A tuple of parent keys for self.key. If the object has
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no parent information, None (as opposed to () for an empty list of
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def __init__(self, key, parents, sha1, text):
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"""Create a ContentFactory."""
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self.storage_kind = 'fulltext'
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self.parents = parents
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def get_bytes_as(self, storage_kind):
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if storage_kind == self.storage_kind:
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raise errors.UnavailableRepresentation(self.key, storage_kind,
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class AbsentContentFactory(ContentFactory):
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"""A placeholder content factory for unavailable texts.
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:ivar storage_kind: 'absent'.
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:ivar key: The key of this content. Each key is a tuple with a single
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def __init__(self, key):
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"""Create a ContentFactory."""
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self.storage_kind = 'absent'
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class AdapterFactory(ContentFactory):
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"""A content factory to adapt between key prefix's."""
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def __init__(self, key, parents, adapted):
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"""Create an adapter factory instance."""
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self.parents = parents
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self._adapted = adapted
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def __getattr__(self, attr):
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"""Return a member from the adapted object."""
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if attr in ('key', 'parents'):
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return self.__dict__[attr]
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return getattr(self._adapted, attr)
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def filter_absent(record_stream):
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"""Adapt a record stream to remove absent records."""
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for record in record_stream:
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if record.storage_kind != 'absent':
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class VersionedFile(object):
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"""Versioned text file storage.
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A versioned file manages versions of line-based text files,
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keeping track of the originating version for each line.
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To clients the "lines" of the file are represented as a list of
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strings. These strings will typically have terminal newline
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characters, but this is not required. In particular files commonly
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do not have a newline at the end of the file.
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Texts are identified by a version-id string.
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def check_not_reserved_id(version_id):
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revision.check_not_reserved_id(version_id)
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def copy_to(self, name, transport):
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"""Copy this versioned file to name on transport."""
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raise NotImplementedError(self.copy_to)
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def get_record_stream(self, versions, ordering, include_delta_closure):
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"""Get a stream of records for versions.
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:param versions: The versions to include. Each version is a tuple
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:param ordering: Either 'unordered' or 'topological'. A topologically
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sorted stream has compression parents strictly before their
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:param include_delta_closure: If True then the closure across any
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compression parents will be included (in the data content of the
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stream, not in the emitted records). This guarantees that
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'fulltext' can be used successfully on every record.
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:return: An iterator of ContentFactory objects, each of which is only
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valid until the iterator is advanced.
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raise NotImplementedError(self.get_record_stream)
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def has_version(self, version_id):
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"""Returns whether version is present."""
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raise NotImplementedError(self.has_version)
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def insert_record_stream(self, stream):
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"""Insert a record stream into this versioned file.
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:param stream: A stream of records to insert.
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:seealso VersionedFile.get_record_stream:
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raise NotImplementedError
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def add_lines(self, version_id, parents, lines, parent_texts=None,
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left_matching_blocks=None, nostore_sha=None, random_id=False,
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"""Add a single text on top of the versioned file.
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Must raise RevisionAlreadyPresent if the new version is
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already present in file history.
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Must raise RevisionNotPresent if any of the given parents are
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not present in file history.
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:param lines: A list of lines. Each line must be a bytestring. And all
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of them except the last must be terminated with \n and contain no
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other \n's. The last line may either contain no \n's or a single
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terminated \n. If the lines list does meet this constraint the add
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routine may error or may succeed - but you will be unable to read
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the data back accurately. (Checking the lines have been split
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correctly is expensive and extremely unlikely to catch bugs so it
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is not done at runtime unless check_content is True.)
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:param parent_texts: An optional dictionary containing the opaque
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representations of some or all of the parents of version_id to
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allow delta optimisations. VERY IMPORTANT: the texts must be those
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returned by add_lines or data corruption can be caused.
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:param left_matching_blocks: a hint about which areas are common
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between the text and its left-hand-parent. The format is
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the SequenceMatcher.get_matching_blocks format.
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:param nostore_sha: Raise ExistingContent and do not add the lines to
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the versioned file if the digest of the lines matches this.
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:param random_id: If True a random id has been selected rather than
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an id determined by some deterministic process such as a converter
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from a foreign VCS. When True the backend may choose not to check
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for uniqueness of the resulting key within the versioned file, so
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this should only be done when the result is expected to be unique
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:param check_content: If True, the lines supplied are verified to be
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bytestrings that are correctly formed lines.
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:return: The text sha1, the number of bytes in the text, and an opaque
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representation of the inserted version which can be provided
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back to future add_lines calls in the parent_texts dictionary.
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self._check_write_ok()
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return self._add_lines(version_id, parents, lines, parent_texts,
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left_matching_blocks, nostore_sha, random_id, check_content)
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def _add_lines(self, version_id, parents, lines, parent_texts,
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left_matching_blocks, nostore_sha, random_id, check_content):
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"""Helper to do the class specific add_lines."""
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raise NotImplementedError(self.add_lines)
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def add_lines_with_ghosts(self, version_id, parents, lines,
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parent_texts=None, nostore_sha=None, random_id=False,
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check_content=True, left_matching_blocks=None):
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"""Add lines to the versioned file, allowing ghosts to be present.
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This takes the same parameters as add_lines and returns the same.
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self._check_write_ok()
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return self._add_lines_with_ghosts(version_id, parents, lines,
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parent_texts, nostore_sha, random_id, check_content, left_matching_blocks)
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def _add_lines_with_ghosts(self, version_id, parents, lines, parent_texts,
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nostore_sha, random_id, check_content, left_matching_blocks):
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"""Helper to do class specific add_lines_with_ghosts."""
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raise NotImplementedError(self.add_lines_with_ghosts)
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def check(self, progress_bar=None):
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"""Check the versioned file for integrity."""
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raise NotImplementedError(self.check)
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def _check_lines_not_unicode(self, lines):
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"""Check that lines being added to a versioned file are not unicode."""
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if line.__class__ is not str:
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raise errors.BzrBadParameterUnicode("lines")
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def _check_lines_are_lines(self, lines):
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"""Check that the lines really are full lines without inline EOL."""
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if '\n' in line[:-1]:
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raise errors.BzrBadParameterContainsNewline("lines")
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def get_format_signature(self):
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"""Get a text description of the data encoding in this file.
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raise NotImplementedError(self.get_format_signature)
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def make_mpdiffs(self, version_ids):
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"""Create multiparent diffs for specified versions."""
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knit_versions = set()
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knit_versions.update(version_ids)
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parent_map = self.get_parent_map(version_ids)
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for version_id in version_ids:
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knit_versions.update(parent_map[version_id])
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raise errors.RevisionNotPresent(version_id, self)
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# We need to filter out ghosts, because we can't diff against them.
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knit_versions = set(self.get_parent_map(knit_versions).keys())
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lines = dict(zip(knit_versions,
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self._get_lf_split_line_list(knit_versions)))
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for version_id in version_ids:
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target = lines[version_id]
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parents = [lines[p] for p in parent_map[version_id] if p in
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# I don't know how this could ever trigger.
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# parent_map[version_id] was already triggered in the previous
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# for loop, and lines[p] has the 'if p in knit_versions' check,
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# so we again won't have a KeyError.
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raise errors.RevisionNotPresent(version_id, self)
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left_parent_blocks = self._extract_blocks(version_id,
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left_parent_blocks = None
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diffs.append(multiparent.MultiParent.from_lines(target, parents,
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def _extract_blocks(self, version_id, source, target):
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def add_mpdiffs(self, records):
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"""Add mpdiffs to this VersionedFile.
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Records should be iterables of version, parents, expected_sha1,
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mpdiff. mpdiff should be a MultiParent instance.
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# Does this need to call self._check_write_ok()? (IanC 20070919)
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mpvf = multiparent.MultiMemoryVersionedFile()
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for version, parent_ids, expected_sha1, mpdiff in records:
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versions.append(version)
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mpvf.add_diff(mpdiff, version, parent_ids)
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needed_parents = set()
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for version, parent_ids, expected_sha1, mpdiff in records:
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needed_parents.update(p for p in parent_ids
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if not mpvf.has_version(p))
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present_parents = set(self.get_parent_map(needed_parents).keys())
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for parent_id, lines in zip(present_parents,
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self._get_lf_split_line_list(present_parents)):
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mpvf.add_version(lines, parent_id, [])
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for (version, parent_ids, expected_sha1, mpdiff), lines in\
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zip(records, mpvf.get_line_list(versions)):
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if len(parent_ids) == 1:
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left_matching_blocks = list(mpdiff.get_matching_blocks(0,
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mpvf.get_diff(parent_ids[0]).num_lines()))
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left_matching_blocks = None
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_, _, version_text = self.add_lines_with_ghosts(version,
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parent_ids, lines, vf_parents,
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left_matching_blocks=left_matching_blocks)
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except NotImplementedError:
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# The vf can't handle ghosts, so add lines normally, which will
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# (reasonably) fail if there are ghosts in the data.
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_, _, version_text = self.add_lines(version,
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parent_ids, lines, vf_parents,
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left_matching_blocks=left_matching_blocks)
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vf_parents[version] = version_text
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sha1s = self.get_sha1s(versions)
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for version, parent_ids, expected_sha1, mpdiff in records:
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if expected_sha1 != sha1s[version]:
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raise errors.VersionedFileInvalidChecksum(version)
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def get_text(self, version_id):
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"""Return version contents as a text string.
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Raises RevisionNotPresent if version is not present in
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return ''.join(self.get_lines(version_id))
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get_string = get_text
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def get_texts(self, version_ids):
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"""Return the texts of listed versions as a list of strings.
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Raises RevisionNotPresent if version is not present in
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return [''.join(self.get_lines(v)) for v in version_ids]
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def get_lines(self, version_id):
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"""Return version contents as a sequence of lines.
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Raises RevisionNotPresent if version is not present in
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raise NotImplementedError(self.get_lines)
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def _get_lf_split_line_list(self, version_ids):
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return [StringIO(t).readlines() for t in self.get_texts(version_ids)]
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def get_ancestry(self, version_ids, topo_sorted=True):
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"""Return a list of all ancestors of given version(s). This
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will not include the null revision.
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This list will not be topologically sorted if topo_sorted=False is
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Must raise RevisionNotPresent if any of the given versions are
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not present in file history."""
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if isinstance(version_ids, basestring):
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version_ids = [version_ids]
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raise NotImplementedError(self.get_ancestry)
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def get_ancestry_with_ghosts(self, version_ids):
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"""Return a list of all ancestors of given version(s). This
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will not include the null revision.
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Must raise RevisionNotPresent if any of the given versions are
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not present in file history.
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Ghosts that are known about will be included in ancestry list,
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but are not explicitly marked.
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raise NotImplementedError(self.get_ancestry_with_ghosts)
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def get_parent_map(self, version_ids):
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"""Get a map of the parents of version_ids.
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:param version_ids: The version ids to look up parents for.
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:return: A mapping from version id to parents.
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raise NotImplementedError(self.get_parent_map)
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def get_parents_with_ghosts(self, version_id):
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"""Return version names for parents of version_id.
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Will raise RevisionNotPresent if version_id is not present
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Ghosts that are known about will be included in the parent list,
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but are not explicitly marked.
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return list(self.get_parent_map([version_id])[version_id])
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raise errors.RevisionNotPresent(version_id, self)
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def annotate(self, version_id):
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"""Return a list of (version-id, line) tuples for version_id.
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:raise RevisionNotPresent: If the given version is
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not present in file history.
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raise NotImplementedError(self.annotate)
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def iter_lines_added_or_present_in_versions(self, version_ids=None,
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"""Iterate over the lines in the versioned file from version_ids.
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This may return lines from other versions. Each item the returned
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iterator yields is a tuple of a line and a text version that that line
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is present in (not introduced in).
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Ordering of results is in whatever order is most suitable for the
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underlying storage format.
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If a progress bar is supplied, it may be used to indicate progress.
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The caller is responsible for cleaning up progress bars (because this
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NOTES: Lines are normalised: they will all have \n terminators.
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Lines are returned in arbitrary order.
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:return: An iterator over (line, version_id).
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raise NotImplementedError(self.iter_lines_added_or_present_in_versions)
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def plan_merge(self, ver_a, ver_b):
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"""Return pseudo-annotation indicating how the two versions merge.
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This is computed between versions a and b and their common
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Weave lines present in none of them are skipped entirely.
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killed-base Dead in base revision
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killed-both Killed in each revision
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unchanged Alive in both a and b (possibly created in both)
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ghost-a Killed in a, unborn in b
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ghost-b Killed in b, unborn in a
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irrelevant Not in either revision
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raise NotImplementedError(VersionedFile.plan_merge)
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def weave_merge(self, plan, a_marker=TextMerge.A_MARKER,
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b_marker=TextMerge.B_MARKER):
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return PlanWeaveMerge(plan, a_marker, b_marker).merge_lines()[0]
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class RecordingVersionedFilesDecorator(object):
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"""A minimal versioned files that records calls made on it.
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Only enough methods have been added to support tests using it to date.
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:ivar calls: A list of the calls made; can be reset at any time by
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def __init__(self, backing_vf):
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"""Create a RecordingVersionedFileDsecorator decorating backing_vf.
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:param backing_vf: The versioned file to answer all methods.
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self._backing_vf = backing_vf
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def add_lines(self, key, parents, lines, parent_texts=None,
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left_matching_blocks=None, nostore_sha=None, random_id=False,
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self.calls.append(("add_lines", key, parents, lines, parent_texts,
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left_matching_blocks, nostore_sha, random_id, check_content))
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return self._backing_vf.add_lines(key, parents, lines, parent_texts,
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left_matching_blocks, nostore_sha, random_id, check_content)
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self._backing_vf.check()
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def get_parent_map(self, keys):
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self.calls.append(("get_parent_map", copy(keys)))
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return self._backing_vf.get_parent_map(keys)
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def get_record_stream(self, keys, sort_order, include_delta_closure):
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self.calls.append(("get_record_stream", list(keys), sort_order,
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include_delta_closure))
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return self._backing_vf.get_record_stream(keys, sort_order,
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include_delta_closure)
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def get_sha1s(self, keys):
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self.calls.append(("get_sha1s", copy(keys)))
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return self._backing_vf.get_sha1s(keys)
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def iter_lines_added_or_present_in_keys(self, keys, pb=None):
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self.calls.append(("iter_lines_added_or_present_in_keys", copy(keys)))
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return self._backing_vf.iter_lines_added_or_present_in_keys(keys, pb=pb)
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self.calls.append(("keys",))
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return self._backing_vf.keys()
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class KeyMapper(object):
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"""KeyMappers map between keys and underlying partitioned storage."""
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"""Map key to an underlying storage identifier.
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:param key: A key tuple e.g. ('file-id', 'revision-id').
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:return: An underlying storage identifier, specific to the partitioning
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raise NotImplementedError(self.map)
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def unmap(self, partition_id):
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"""Map a partitioned storage id back to a key prefix.
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:param partition_id: The underlying partition id.
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:return: As much of a key (or prefix) as is derivable from the partition
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raise NotImplementedError(self.unmap)
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class ConstantMapper(KeyMapper):
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"""A key mapper that maps to a constant result."""
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def __init__(self, result):
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"""Create a ConstantMapper which will return result for all maps."""
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self._result = result
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"""See KeyMapper.map()."""
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class URLEscapeMapper(KeyMapper):
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"""Base class for use with transport backed storage.
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This provides a map and unmap wrapper that respectively url escape and
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unescape their outputs and inputs.
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"""See KeyMapper.map()."""
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return urllib.quote(self._map(key))
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def unmap(self, partition_id):
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"""See KeyMapper.unmap()."""
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return self._unmap(urllib.unquote(partition_id))
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class PrefixMapper(URLEscapeMapper):
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"""A key mapper that extracts the first component of a key.
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This mapper is for use with a transport based backend.
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"""See KeyMapper.map()."""
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def _unmap(self, partition_id):
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"""See KeyMapper.unmap()."""
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return (partition_id,)
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class HashPrefixMapper(URLEscapeMapper):
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"""A key mapper that combines the first component of a key with a hash.
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This mapper is for use with a transport based backend.
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"""See KeyMapper.map()."""
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prefix = self._escape(key[0])
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return "%02x/%s" % (adler32(prefix) & 0xff, prefix)
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def _escape(self, prefix):
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"""No escaping needed here."""
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def _unmap(self, partition_id):
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"""See KeyMapper.unmap()."""
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return (self._unescape(osutils.basename(partition_id)),)
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def _unescape(self, basename):
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"""No unescaping needed for HashPrefixMapper."""
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class HashEscapedPrefixMapper(HashPrefixMapper):
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"""Combines the escaped first component of a key with a hash.
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This mapper is for use with a transport based backend.
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_safe = "abcdefghijklmnopqrstuvwxyz0123456789-_@,."
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def _escape(self, prefix):
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"""Turn a key element into a filesystem safe string.
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This is similar to a plain urllib.quote, except
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it uses specific safe characters, so that it doesn't
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have to translate a lot of valid file ids.
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# @ does not get escaped. This is because it is a valid
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# filesystem character we use all the time, and it looks
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# a lot better than seeing %40 all the time.
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r = [((c in self._safe) and c or ('%%%02x' % ord(c)))
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def _unescape(self, basename):
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"""Escaped names are easily unescaped by urlutils."""
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return urllib.unquote(basename)
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def make_versioned_files_factory(versioned_file_factory, mapper):
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"""Create a ThunkedVersionedFiles factory.
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This will create a callable which when called creates a
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ThunkedVersionedFiles on a transport, using mapper to access individual
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versioned files, and versioned_file_factory to create each individual file.
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def factory(transport):
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return ThunkedVersionedFiles(transport, versioned_file_factory, mapper,
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class VersionedFiles(object):
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"""Storage for many versioned files.
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This object allows a single keyspace for accessing the history graph and
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contents of named bytestrings.
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Currently no implementation allows the graph of different key prefixes to
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intersect, but the API does allow such implementations in the future.
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The keyspace is expressed via simple tuples. Any instance of VersionedFiles
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may have a different length key-size, but that size will be constant for
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all texts added to or retrieved from it. For instance, bzrlib uses
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instances with a key-size of 2 for storing user files in a repository, with
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the first element the fileid, and the second the version of that file.
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The use of tuples allows a single code base to support several different
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uses with only the mapping logic changing from instance to instance.
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def add_lines(self, key, parents, lines, parent_texts=None,
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left_matching_blocks=None, nostore_sha=None, random_id=False,
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"""Add a text to the store.
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:param key: The key tuple of the text to add.
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:param parents: The parents key tuples of the text to add.
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:param lines: A list of lines. Each line must be a bytestring. And all
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of them except the last must be terminated with \n and contain no
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other \n's. The last line may either contain no \n's or a single
722
terminating \n. If the lines list does meet this constraint the add
723
routine may error or may succeed - but you will be unable to read
724
the data back accurately. (Checking the lines have been split
725
correctly is expensive and extremely unlikely to catch bugs so it
726
is not done at runtime unless check_content is True.)
727
:param parent_texts: An optional dictionary containing the opaque
728
representations of some or all of the parents of version_id to
729
allow delta optimisations. VERY IMPORTANT: the texts must be those
730
returned by add_lines or data corruption can be caused.
731
:param left_matching_blocks: a hint about which areas are common
732
between the text and its left-hand-parent. The format is
733
the SequenceMatcher.get_matching_blocks format.
734
:param nostore_sha: Raise ExistingContent and do not add the lines to
735
the versioned file if the digest of the lines matches this.
736
:param random_id: If True a random id has been selected rather than
737
an id determined by some deterministic process such as a converter
738
from a foreign VCS. When True the backend may choose not to check
739
for uniqueness of the resulting key within the versioned file, so
740
this should only be done when the result is expected to be unique
742
:param check_content: If True, the lines supplied are verified to be
743
bytestrings that are correctly formed lines.
744
:return: The text sha1, the number of bytes in the text, and an opaque
745
representation of the inserted version which can be provided
746
back to future add_lines calls in the parent_texts dictionary.
748
raise NotImplementedError(self.add_lines)
750
def add_mpdiffs(self, records):
751
"""Add mpdiffs to this VersionedFile.
753
Records should be iterables of version, parents, expected_sha1,
754
mpdiff. mpdiff should be a MultiParent instance.
757
mpvf = multiparent.MultiMemoryVersionedFile()
759
for version, parent_ids, expected_sha1, mpdiff in records:
760
versions.append(version)
761
mpvf.add_diff(mpdiff, version, parent_ids)
762
needed_parents = set()
763
for version, parent_ids, expected_sha1, mpdiff in records:
764
needed_parents.update(p for p in parent_ids
765
if not mpvf.has_version(p))
766
# It seems likely that adding all the present parents as fulltexts can
767
# easily exhaust memory.
768
split_lines = osutils.split_lines
769
for record in self.get_record_stream(needed_parents, 'unordered',
771
if record.storage_kind == 'absent':
773
mpvf.add_version(split_lines(record.get_bytes_as('fulltext')),
775
for (key, parent_keys, expected_sha1, mpdiff), lines in\
776
zip(records, mpvf.get_line_list(versions)):
777
if len(parent_keys) == 1:
778
left_matching_blocks = list(mpdiff.get_matching_blocks(0,
779
mpvf.get_diff(parent_keys[0]).num_lines()))
781
left_matching_blocks = None
782
version_sha1, _, version_text = self.add_lines(key,
783
parent_keys, lines, vf_parents,
784
left_matching_blocks=left_matching_blocks)
785
if version_sha1 != expected_sha1:
786
raise errors.VersionedFileInvalidChecksum(version)
787
vf_parents[key] = version_text
789
def annotate(self, key):
790
"""Return a list of (version-key, line) tuples for the text of key.
792
:raise RevisionNotPresent: If the key is not present.
794
raise NotImplementedError(self.annotate)
796
def check(self, progress_bar=None):
797
"""Check this object for integrity."""
798
raise NotImplementedError(self.check)
801
def check_not_reserved_id(version_id):
802
revision.check_not_reserved_id(version_id)
804
def _check_lines_not_unicode(self, lines):
805
"""Check that lines being added to a versioned file are not unicode."""
807
if line.__class__ is not str:
808
raise errors.BzrBadParameterUnicode("lines")
810
def _check_lines_are_lines(self, lines):
811
"""Check that the lines really are full lines without inline EOL."""
813
if '\n' in line[:-1]:
814
raise errors.BzrBadParameterContainsNewline("lines")
816
def get_parent_map(self, keys):
817
"""Get a map of the parents of keys.
819
:param keys: The keys to look up parents for.
820
:return: A mapping from keys to parents. Absent keys are absent from
823
raise NotImplementedError(self.get_parent_map)
825
def get_record_stream(self, keys, ordering, include_delta_closure):
826
"""Get a stream of records for keys.
828
:param keys: The keys to include.
829
:param ordering: Either 'unordered' or 'topological'. A topologically
830
sorted stream has compression parents strictly before their
832
:param include_delta_closure: If True then the closure across any
833
compression parents will be included (in the opaque data).
834
:return: An iterator of ContentFactory objects, each of which is only
835
valid until the iterator is advanced.
837
raise NotImplementedError(self.get_record_stream)
839
def get_sha1s(self, keys):
840
"""Get the sha1's of the texts for the given keys.
842
:param keys: The names of the keys to lookup
843
:return: a dict from key to sha1 digest. Keys of texts which are not
844
present in the store are not present in the returned
847
raise NotImplementedError(self.get_sha1s)
849
def insert_record_stream(self, stream):
850
"""Insert a record stream into this container.
852
:param stream: A stream of records to insert.
854
:seealso VersionedFile.get_record_stream:
856
raise NotImplementedError
858
def iter_lines_added_or_present_in_keys(self, keys, pb=None):
859
"""Iterate over the lines in the versioned files from keys.
861
This may return lines from other keys. Each item the returned
862
iterator yields is a tuple of a line and a text version that that line
863
is present in (not introduced in).
865
Ordering of results is in whatever order is most suitable for the
866
underlying storage format.
868
If a progress bar is supplied, it may be used to indicate progress.
869
The caller is responsible for cleaning up progress bars (because this
873
* Lines are normalised by the underlying store: they will all have \n
875
* Lines are returned in arbitrary order.
877
:return: An iterator over (line, key).
879
raise NotImplementedError(self.iter_lines_added_or_present_in_keys)
882
"""Return a iterable of the keys for all the contained texts."""
883
raise NotImplementedError(self.keys)
885
def make_mpdiffs(self, keys):
886
"""Create multiparent diffs for specified keys."""
887
keys_order = tuple(keys)
888
keys = frozenset(keys)
889
knit_keys = set(keys)
890
parent_map = self.get_parent_map(keys)
891
for parent_keys in parent_map.itervalues():
893
knit_keys.update(parent_keys)
894
missing_keys = keys - set(parent_map)
896
raise errors.RevisionNotPresent(list(missing_keys)[0], self)
897
# We need to filter out ghosts, because we can't diff against them.
898
maybe_ghosts = knit_keys - keys
899
ghosts = maybe_ghosts - set(self.get_parent_map(maybe_ghosts))
900
knit_keys.difference_update(ghosts)
902
split_lines = osutils.split_lines
903
for record in self.get_record_stream(knit_keys, 'topological', True):
904
lines[record.key] = split_lines(record.get_bytes_as('fulltext'))
905
# line_block_dict = {}
906
# for parent, blocks in record.extract_line_blocks():
907
# line_blocks[parent] = blocks
908
# line_blocks[record.key] = line_block_dict
910
for key in keys_order:
912
parents = parent_map[key] or []
913
# Note that filtering knit_keys can lead to a parent difference
914
# between the creation and the application of the mpdiff.
915
parent_lines = [lines[p] for p in parents if p in knit_keys]
916
if len(parent_lines) > 0:
917
left_parent_blocks = self._extract_blocks(key, parent_lines[0],
920
left_parent_blocks = None
921
diffs.append(multiparent.MultiParent.from_lines(target,
922
parent_lines, left_parent_blocks))
925
def _extract_blocks(self, version_id, source, target):
929
class ThunkedVersionedFiles(VersionedFiles):
930
"""Storage for many versioned files thunked onto a 'VersionedFile' class.
932
This object allows a single keyspace for accessing the history graph and
933
contents of named bytestrings.
935
Currently no implementation allows the graph of different key prefixes to
936
intersect, but the API does allow such implementations in the future.
939
def __init__(self, transport, file_factory, mapper, is_locked):
940
"""Create a ThunkedVersionedFiles."""
941
self._transport = transport
942
self._file_factory = file_factory
943
self._mapper = mapper
944
self._is_locked = is_locked
946
def add_lines(self, key, parents, lines, parent_texts=None,
947
left_matching_blocks=None, nostore_sha=None, random_id=False,
949
"""See VersionedFiles.add_lines()."""
950
path = self._mapper.map(key)
952
parents = [parent[-1] for parent in parents]
953
vf = self._get_vf(path)
956
return vf.add_lines_with_ghosts(version_id, parents, lines,
957
parent_texts=parent_texts,
958
left_matching_blocks=left_matching_blocks,
959
nostore_sha=nostore_sha, random_id=random_id,
960
check_content=check_content)
961
except NotImplementedError:
962
return vf.add_lines(version_id, parents, lines,
963
parent_texts=parent_texts,
964
left_matching_blocks=left_matching_blocks,
965
nostore_sha=nostore_sha, random_id=random_id,
966
check_content=check_content)
967
except errors.NoSuchFile:
968
# parent directory may be missing, try again.
969
self._transport.mkdir(osutils.dirname(path))
971
return vf.add_lines_with_ghosts(version_id, parents, lines,
972
parent_texts=parent_texts,
973
left_matching_blocks=left_matching_blocks,
974
nostore_sha=nostore_sha, random_id=random_id,
975
check_content=check_content)
976
except NotImplementedError:
977
return vf.add_lines(version_id, parents, lines,
978
parent_texts=parent_texts,
979
left_matching_blocks=left_matching_blocks,
980
nostore_sha=nostore_sha, random_id=random_id,
981
check_content=check_content)
983
def annotate(self, key):
984
"""Return a list of (version-key, line) tuples for the text of key.
986
:raise RevisionNotPresent: If the key is not present.
989
path = self._mapper.map(prefix)
990
vf = self._get_vf(path)
991
origins = vf.annotate(key[-1])
993
for origin, line in origins:
994
result.append((prefix + (origin,), line))
997
def check(self, progress_bar=None):
998
"""See VersionedFiles.check()."""
999
for prefix, vf in self._iter_all_components():
1002
def get_parent_map(self, keys):
1003
"""Get a map of the parents of keys.
1005
:param keys: The keys to look up parents for.
1006
:return: A mapping from keys to parents. Absent keys are absent from
1009
prefixes = self._partition_keys(keys)
1011
for prefix, suffixes in prefixes.items():
1012
path = self._mapper.map(prefix)
1013
vf = self._get_vf(path)
1014
parent_map = vf.get_parent_map(suffixes)
1015
for key, parents in parent_map.items():
1016
result[prefix + (key,)] = tuple(
1017
prefix + (parent,) for parent in parents)
1020
def _get_vf(self, path):
1021
if not self._is_locked():
1022
raise errors.ObjectNotLocked(self)
1023
return self._file_factory(path, self._transport, create=True,
1024
get_scope=lambda:None)
1026
def _partition_keys(self, keys):
1027
"""Turn keys into a dict of prefix:suffix_list."""
1030
prefix_keys = result.setdefault(key[:-1], [])
1031
prefix_keys.append(key[-1])
1034
def _get_all_prefixes(self):
1035
# Identify all key prefixes.
1036
# XXX: A bit hacky, needs polish.
1037
if type(self._mapper) == ConstantMapper:
1038
paths = [self._mapper.map(())]
1042
for quoted_relpath in self._transport.iter_files_recursive():
1043
path, ext = os.path.splitext(quoted_relpath)
1045
paths = list(relpaths)
1046
prefixes = [self._mapper.unmap(path) for path in paths]
1047
return zip(paths, prefixes)
1049
def get_record_stream(self, keys, ordering, include_delta_closure):
1050
"""See VersionedFiles.get_record_stream()."""
1051
# Ordering will be taken care of by each partitioned store; group keys
1054
for prefix, suffixes, vf in self._iter_keys_vf(keys):
1055
suffixes = [(suffix,) for suffix in suffixes]
1056
for record in vf.get_record_stream(suffixes, ordering,
1057
include_delta_closure):
1058
if record.parents is not None:
1059
record.parents = tuple(
1060
prefix + parent for parent in record.parents)
1061
record.key = prefix + record.key
1064
def _iter_keys_vf(self, keys):
1065
prefixes = self._partition_keys(keys)
1067
for prefix, suffixes in prefixes.items():
1068
path = self._mapper.map(prefix)
1069
vf = self._get_vf(path)
1070
yield prefix, suffixes, vf
1072
def get_sha1s(self, keys):
1073
"""See VersionedFiles.get_sha1s()."""
1075
for prefix,suffixes, vf in self._iter_keys_vf(keys):
1076
vf_sha1s = vf.get_sha1s(suffixes)
1077
for suffix, sha1 in vf_sha1s.iteritems():
1078
sha1s[prefix + (suffix,)] = sha1
1081
def insert_record_stream(self, stream):
1082
"""Insert a record stream into this container.
1084
:param stream: A stream of records to insert.
1086
:seealso VersionedFile.get_record_stream:
1088
for record in stream:
1089
prefix = record.key[:-1]
1090
key = record.key[-1:]
1091
if record.parents is not None:
1092
parents = [parent[-1:] for parent in record.parents]
1095
thunk_record = AdapterFactory(key, parents, record)
1096
path = self._mapper.map(prefix)
1097
# Note that this parses the file many times; we can do better but
1098
# as this only impacts weaves in terms of performance, it is
1100
vf = self._get_vf(path)
1101
vf.insert_record_stream([thunk_record])
1103
def iter_lines_added_or_present_in_keys(self, keys, pb=None):
1104
"""Iterate over the lines in the versioned files from keys.
1106
This may return lines from other keys. Each item the returned
1107
iterator yields is a tuple of a line and a text version that that line
1108
is present in (not introduced in).
1110
Ordering of results is in whatever order is most suitable for the
1111
underlying storage format.
1113
If a progress bar is supplied, it may be used to indicate progress.
1114
The caller is responsible for cleaning up progress bars (because this
1118
* Lines are normalised by the underlying store: they will all have \n
1120
* Lines are returned in arbitrary order.
1122
:return: An iterator over (line, key).
1124
for prefix, suffixes, vf in self._iter_keys_vf(keys):
1125
for line, version in vf.iter_lines_added_or_present_in_versions(suffixes):
1126
yield line, prefix + (version,)
1128
def _iter_all_components(self):
1129
for path, prefix in self._get_all_prefixes():
1130
yield prefix, self._get_vf(path)
1133
"""See VersionedFiles.keys()."""
1135
for prefix, vf in self._iter_all_components():
1136
for suffix in vf.versions():
1137
result.add(prefix + (suffix,))
1141
class _PlanMergeVersionedFile(VersionedFiles):
1142
"""A VersionedFile for uncommitted and committed texts.
1144
It is intended to allow merges to be planned with working tree texts.
1145
It implements only the small part of the VersionedFiles interface used by
1146
PlanMerge. It falls back to multiple versionedfiles for data not stored in
1147
_PlanMergeVersionedFile itself.
1149
:ivar: fallback_versionedfiles a list of VersionedFiles objects that can be
1150
queried for missing texts.
1153
def __init__(self, file_id):
1154
"""Create a _PlanMergeVersionedFile.
1156
:param file_id: Used with _PlanMerge code which is not yet fully
1157
tuple-keyspace aware.
1159
self._file_id = file_id
1160
# fallback locations
1161
self.fallback_versionedfiles = []
1162
# Parents for locally held keys.
1164
# line data for locally held keys.
1166
# key lookup providers
1167
self._providers = [DictParentsProvider(self._parents)]
1169
def plan_merge(self, ver_a, ver_b, base=None):
1170
"""See VersionedFile.plan_merge"""
1171
from bzrlib.merge import _PlanMerge
1173
return _PlanMerge(ver_a, ver_b, self, (self._file_id,)).plan_merge()
1174
old_plan = list(_PlanMerge(ver_a, base, self, (self._file_id,)).plan_merge())
1175
new_plan = list(_PlanMerge(ver_a, ver_b, self, (self._file_id,)).plan_merge())
1176
return _PlanMerge._subtract_plans(old_plan, new_plan)
1178
def plan_lca_merge(self, ver_a, ver_b, base=None):
1179
from bzrlib.merge import _PlanLCAMerge
1181
new_plan = _PlanLCAMerge(ver_a, ver_b, self, (self._file_id,), graph).plan_merge()
1184
old_plan = _PlanLCAMerge(ver_a, base, self, (self._file_id,), graph).plan_merge()
1185
return _PlanLCAMerge._subtract_plans(list(old_plan), list(new_plan))
1187
def add_lines(self, key, parents, lines):
1188
"""See VersionedFiles.add_lines
1190
Lines are added locally, not to fallback versionedfiles. Also, ghosts
1191
are permitted. Only reserved ids are permitted.
1193
if type(key) is not tuple:
1194
raise TypeError(key)
1195
if not revision.is_reserved_id(key[-1]):
1196
raise ValueError('Only reserved ids may be used')
1198
raise ValueError('Parents may not be None')
1200
raise ValueError('Lines may not be None')
1201
self._parents[key] = tuple(parents)
1202
self._lines[key] = lines
1204
def get_record_stream(self, keys, ordering, include_delta_closure):
1207
if key in self._lines:
1208
lines = self._lines[key]
1209
parents = self._parents[key]
1211
yield FulltextContentFactory(key, parents, None,
1213
for versionedfile in self.fallback_versionedfiles:
1214
for record in versionedfile.get_record_stream(
1215
pending, 'unordered', True):
1216
if record.storage_kind == 'absent':
1219
pending.remove(record.key)
1223
# report absent entries
1225
yield AbsentContentFactory(key)
1227
def get_parent_map(self, keys):
1228
"""See VersionedFiles.get_parent_map"""
1229
# We create a new provider because a fallback may have been added.
1230
# If we make fallbacks private we can update a stack list and avoid
1231
# object creation thrashing.
1234
if revision.NULL_REVISION in keys:
1235
keys.remove(revision.NULL_REVISION)
1236
result[revision.NULL_REVISION] = ()
1237
self._providers = self._providers[:1] + self.fallback_versionedfiles
1239
_StackedParentsProvider(self._providers).get_parent_map(keys))
1240
for key, parents in result.iteritems():
1242
result[key] = (revision.NULL_REVISION,)
1246
class PlanWeaveMerge(TextMerge):
1247
"""Weave merge that takes a plan as its input.
1249
This exists so that VersionedFile.plan_merge is implementable.
1250
Most callers will want to use WeaveMerge instead.
1253
def __init__(self, plan, a_marker=TextMerge.A_MARKER,
1254
b_marker=TextMerge.B_MARKER):
1255
TextMerge.__init__(self, a_marker, b_marker)
1258
def _merge_struct(self):
1263
def outstanding_struct():
1264
if not lines_a and not lines_b:
1266
elif ch_a and not ch_b:
1269
elif ch_b and not ch_a:
1271
elif lines_a == lines_b:
1274
yield (lines_a, lines_b)
1276
# We previously considered either 'unchanged' or 'killed-both' lines
1277
# to be possible places to resynchronize. However, assuming agreement
1278
# on killed-both lines may be too aggressive. -- mbp 20060324
1279
for state, line in self.plan:
1280
if state == 'unchanged':
1281
# resync and flush queued conflicts changes if any
1282
for struct in outstanding_struct():
1288
if state == 'unchanged':
1291
elif state == 'killed-a':
1293
lines_b.append(line)
1294
elif state == 'killed-b':
1296
lines_a.append(line)
1297
elif state == 'new-a':
1299
lines_a.append(line)
1300
elif state == 'new-b':
1302
lines_b.append(line)
1303
elif state == 'conflicted-a':
1305
lines_a.append(line)
1306
elif state == 'conflicted-b':
1308
lines_b.append(line)
1310
if state not in ('irrelevant', 'ghost-a', 'ghost-b',
1311
'killed-base', 'killed-both'):
1312
raise AssertionError(state)
1313
for struct in outstanding_struct():
1317
class WeaveMerge(PlanWeaveMerge):
1318
"""Weave merge that takes a VersionedFile and two versions as its input."""
1320
def __init__(self, versionedfile, ver_a, ver_b,
1321
a_marker=PlanWeaveMerge.A_MARKER, b_marker=PlanWeaveMerge.B_MARKER):
1322
plan = versionedfile.plan_merge(ver_a, ver_b)
1323
PlanWeaveMerge.__init__(self, plan, a_marker, b_marker)
1326
class VirtualVersionedFiles(VersionedFiles):
1327
"""Dummy implementation for VersionedFiles that uses other functions for
1328
obtaining fulltexts and parent maps.
1330
This is always on the bottom of the stack and uses string keys
1331
(rather than tuples) internally.
1334
def __init__(self, get_parent_map, get_lines):
1335
"""Create a VirtualVersionedFiles.
1337
:param get_parent_map: Same signature as Repository.get_parent_map.
1338
:param get_lines: Should return lines for specified key or None if
1341
super(VirtualVersionedFiles, self).__init__()
1342
self._get_parent_map = get_parent_map
1343
self._get_lines = get_lines
1345
def check(self, progressbar=None):
1346
"""See VersionedFiles.check.
1348
:note: Always returns True for VirtualVersionedFiles.
1352
def add_mpdiffs(self, records):
1353
"""See VersionedFiles.mpdiffs.
1355
:note: Not implemented for VirtualVersionedFiles.
1357
raise NotImplementedError(self.add_mpdiffs)
1359
def get_parent_map(self, keys):
1360
"""See VersionedFiles.get_parent_map."""
1361
return dict([((k,), tuple([(p,) for p in v]))
1362
for k,v in self._get_parent_map([k for (k,) in keys]).iteritems()])
1364
def get_sha1s(self, keys):
1365
"""See VersionedFiles.get_sha1s."""
1368
lines = self._get_lines(k)
1369
if lines is not None:
1370
if not isinstance(lines, list):
1371
raise AssertionError
1372
ret[(k,)] = osutils.sha_strings(lines)
1375
def get_record_stream(self, keys, ordering, include_delta_closure):
1376
"""See VersionedFiles.get_record_stream."""
1377
for (k,) in list(keys):
1378
lines = self._get_lines(k)
1379
if lines is not None:
1380
if not isinstance(lines, list):
1381
raise AssertionError
1382
yield FulltextContentFactory((k,), None,
1383
sha1=osutils.sha_strings(lines),
1384
text=''.join(lines))
1386
yield AbsentContentFactory((k,))
added
removed
bzrlib/versionedfile.py
