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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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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 copy import deepcopy
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from bzrlib import (
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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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from bzrlib.util import bencode
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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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# adapter_registry.register_lazy(('knit-annotated-ft-gz', 'chunked'),
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# 'bzrlib.knit', 'FTAnnotatedToChunked')
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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 ChunkedContentFactory(ContentFactory):
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"""Static data content factory.
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This takes a 'chunked' list of strings. The only requirement on 'chunked' is
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that ''.join(lines) becomes a valid fulltext. A tuple of a single string
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satisfies this, as does a list of lines.
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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, chunks):
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"""Create a ContentFactory."""
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self.storage_kind = 'chunked'
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self.parents = parents
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self._chunks = chunks
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def get_bytes_as(self, storage_kind):
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if storage_kind == 'chunked':
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elif storage_kind == 'fulltext':
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return ''.join(self._chunks)
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raise errors.UnavailableRepresentation(self.key, storage_kind,
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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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elif storage_kind == 'chunked':
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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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from bzrlib.symbol_versioning import (deprecated_function,
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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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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 _check_write_ok(self):
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"""Is the versioned file marked as 'finished' ? Raise if it is."""
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raise errors.OutSideTransaction()
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if self._access_mode != 'w':
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raise errors.ReadOnlyObjectDirtiedError(self)
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def enable_cache(self):
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"""Tell this versioned file that it should cache any data it reads.
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This is advisory, implementations do not have to support caching.
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def clear_cache(self):
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"""Remove any data cached in the versioned file object.
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This only needs to be supported if caches are supported
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def clone_text(self, new_version_id, old_version_id, parents):
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"""Add an identical text to old_version_id as new_version_id.
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Must raise RevisionNotPresent if the old version or any of the
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parents are not present in file history.
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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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new_version_id = osutils.safe_revision_id(new_version_id)
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old_version_id = osutils.safe_revision_id(old_version_id)
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self._check_write_ok()
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return self._clone_text(new_version_id, old_version_id, parents)
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def _clone_text(self, new_version_id, old_version_id, parents):
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"""Helper function to do the _clone_text work."""
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raise NotImplementedError(self.clone_text)
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def create_empty(self, name, transport, mode=None):
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"""Create a new versioned file of this exact type.
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:param name: the file name
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:param transport: the transport
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:param mode: optional file mode.
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raise NotImplementedError(self.create_empty)
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def fix_parents(self, version_id, new_parents):
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"""Fix the parents list for version.
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This is done by appending a new version to the index
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with identical data except for the parents list.
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the parents list must be a superset of the current
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version_id = osutils.safe_revision_id(version_id)
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new_parents = [osutils.safe_revision_id(p) for p in new_parents]
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self._check_write_ok()
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return self._fix_parents(version_id, new_parents)
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def _fix_parents(self, version_id, new_parents):
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"""Helper for fix_parents."""
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raise NotImplementedError(self.fix_parents)
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def get_delta(self, version):
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"""Get a delta for constructing version from some other version.
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:return: (delta_parent, sha1, noeol, delta)
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Where delta_parent is a version id or None to indicate no parent.
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raise NotImplementedError(self.get_delta)
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def get_deltas(self, version_ids):
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"""Get multiple deltas at once for constructing versions.
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:return: dict(version_id:(delta_parent, sha1, noeol, delta))
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Where delta_parent is a version id or None to indicate no parent, and
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version_id is the version_id created by that delta.
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for version_id in version_ids:
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result[version_id] = self.get_delta(version_id)
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def get_sha1(self, version_id):
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"""Get the stored sha1 sum for the given revision.
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:param name: The name of the version to lookup
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raise NotImplementedError(self.get_sha1)
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def get_suffixes(self):
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"""Return the file suffixes associated with this versioned file."""
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raise NotImplementedError(self.get_suffixes)
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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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unchanged Alive in both a and b (possibly created in both)
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new-a Created in a
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new-b Created in b
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ghost-a Killed in a, unborn in b
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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 RecordingVersionedFilesDecorator 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 OrderingVersionedFilesDecorator(RecordingVersionedFilesDecorator):
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"""A VF that records calls, and returns keys in specific order.
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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, key_priority):
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"""Create a RecordingVersionedFilesDecorator decorating backing_vf.
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:param backing_vf: The versioned file to answer all methods.
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:param key_priority: A dictionary defining what order keys should be
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returned from an 'unordered' get_record_stream request.
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Keys with lower priority are returned first, keys not present in
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the map get an implicit priority of 0, and are returned in
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lexicographical order.
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RecordingVersionedFilesDecorator.__init__(self, backing_vf)
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self._key_priority = key_priority
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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))
630
if sort_order == 'unordered':
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return (self._key_priority.get(key, 0), key)
633
# Use a defined order by asking for the keys one-by-one from the
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for key in sorted(keys, key=sort_key):
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for record in self._backing_vf.get_record_stream([key],
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'unordered', include_delta_closure):
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for record in self._backing_vf.get_record_stream(keys, sort_order,
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include_delta_closure):
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class KeyMapper(object):
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"""KeyMappers map between keys and underlying partitioned storage."""
649
"""Map key to an underlying storage identifier.
651
: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."""
670
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()."""
688
return urllib.quote(self._map(key))
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def unmap(self, partition_id):
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"""See KeyMapper.unmap()."""
692
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.
713
This mapper is for use with a transport based backend.
717
"""See KeyMapper.map()."""
718
prefix = self._escape(key[0])
719
return "%02x/%s" % (adler32(prefix) & 0xff, prefix)
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def _escape(self, prefix):
722
"""No escaping needed here."""
725
def _unmap(self, partition_id):
726
"""See KeyMapper.unmap()."""
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return (self._unescape(osutils.basename(partition_id)),)
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def _unescape(self, basename):
730
"""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.
740
_safe = "abcdefghijklmnopqrstuvwxyz0123456789-_@,."
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def _escape(self, prefix):
743
"""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
747
have to translate a lot of valid file ids.
749
# @ does not get escaped. This is because it is a valid
750
# filesystem character we use all the time, and it looks
751
# a lot better than seeing %40 all the time.
752
r = [((c in self._safe) and c or ('%%%02x' % ord(c)))
756
def _unescape(self, basename):
757
"""Escaped names are easily unescaped by urlutils."""
758
return urllib.unquote(basename)
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def make_versioned_files_factory(versioned_file_factory, mapper):
762
"""Create a ThunkedVersionedFiles factory.
764
This will create a callable which when called creates a
765
ThunkedVersionedFiles on a transport, using mapper to access individual
766
versioned files, and versioned_file_factory to create each individual file.
768
def factory(transport):
769
return ThunkedVersionedFiles(transport, versioned_file_factory, mapper,
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class VersionedFiles(object):
775
"""Storage for many versioned files.
777
This object allows a single keyspace for accessing the history graph and
778
contents of named bytestrings.
780
Currently no implementation allows the graph of different key prefixes to
781
intersect, but the API does allow such implementations in the future.
783
The keyspace is expressed via simple tuples. Any instance of VersionedFiles
784
may have a different length key-size, but that size will be constant for
785
all texts added to or retrieved from it. For instance, bzrlib uses
786
instances with a key-size of 2 for storing user files in a repository, with
787
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
790
uses with only the mapping logic changing from instance to instance.
793
def add_lines(self, key, parents, lines, parent_texts=None,
794
left_matching_blocks=None, nostore_sha=None, random_id=False,
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"""Add a text to the store.
798
:param key: The key tuple of the text to add. If the last element is
799
None, a CHK string will be generated during the addition.
800
:param parents: The parents key tuples of the text to add.
801
:param lines: A list of lines. Each line must be a bytestring. And all
802
of them except the last must be terminated with \n and contain no
803
other \n's. The last line may either contain no \n's or a single
804
terminating \n. If the lines list does meet this constraint the add
805
routine may error or may succeed - but you will be unable to read
806
the data back accurately. (Checking the lines have been split
807
correctly is expensive and extremely unlikely to catch bugs so it
808
is not done at runtime unless check_content is True.)
809
:param parent_texts: An optional dictionary containing the opaque
810
representations of some or all of the parents of version_id to
811
allow delta optimisations. VERY IMPORTANT: the texts must be those
812
returned by add_lines or data corruption can be caused.
813
:param left_matching_blocks: a hint about which areas are common
814
between the text and its left-hand-parent. The format is
815
the SequenceMatcher.get_matching_blocks format.
816
:param nostore_sha: Raise ExistingContent and do not add the lines to
817
the versioned file if the digest of the lines matches this.
818
:param random_id: If True a random id has been selected rather than
819
an id determined by some deterministic process such as a converter
820
from a foreign VCS. When True the backend may choose not to check
821
for uniqueness of the resulting key within the versioned file, so
822
this should only be done when the result is expected to be unique
824
:param check_content: If True, the lines supplied are verified to be
825
bytestrings that are correctly formed lines.
826
:return: The text sha1, the number of bytes in the text, and an opaque
827
representation of the inserted version which can be provided
828
back to future add_lines calls in the parent_texts dictionary.
830
raise NotImplementedError(self.add_lines)
832
def add_mpdiffs(self, records):
833
"""Add mpdiffs to this VersionedFile.
835
Records should be iterables of version, parents, expected_sha1,
836
mpdiff. mpdiff should be a MultiParent instance.
839
mpvf = multiparent.MultiMemoryVersionedFile()
841
for version, parent_ids, expected_sha1, mpdiff in records:
842
versions.append(version)
843
mpvf.add_diff(mpdiff, version, parent_ids)
844
needed_parents = set()
845
for version, parent_ids, expected_sha1, mpdiff in records:
846
needed_parents.update(p for p in parent_ids
847
if not mpvf.has_version(p))
848
# It seems likely that adding all the present parents as fulltexts can
849
# easily exhaust memory.
850
chunks_to_lines = osutils.chunks_to_lines
851
for record in self.get_record_stream(needed_parents, 'unordered',
853
if record.storage_kind == 'absent':
855
mpvf.add_version(chunks_to_lines(record.get_bytes_as('chunked')),
857
for (key, parent_keys, expected_sha1, mpdiff), lines in\
858
zip(records, mpvf.get_line_list(versions)):
859
if len(parent_keys) == 1:
860
left_matching_blocks = list(mpdiff.get_matching_blocks(0,
861
mpvf.get_diff(parent_keys[0]).num_lines()))
863
left_matching_blocks = None
864
version_sha1, _, version_text = self.add_lines(key,
865
parent_keys, lines, vf_parents,
866
left_matching_blocks=left_matching_blocks)
867
if version_sha1 != expected_sha1:
868
raise errors.VersionedFileInvalidChecksum(version)
869
vf_parents[key] = version_text
871
def annotate(self, key):
872
"""Return a list of (version-key, line) tuples for the text of key.
874
:raise RevisionNotPresent: If the key is not present.
876
raise NotImplementedError(self.annotate)
878
def check(self, progress_bar=None):
879
"""Check this object for integrity."""
880
raise NotImplementedError(self.check)
883
def check_not_reserved_id(version_id):
884
revision.check_not_reserved_id(version_id)
886
def _check_lines_not_unicode(self, lines):
887
"""Check that lines being added to a versioned file are not unicode."""
889
if line.__class__ is not str:
890
raise errors.BzrBadParameterUnicode("lines")
892
def _check_lines_are_lines(self, lines):
893
"""Check that the lines really are full lines without inline EOL."""
895
if '\n' in line[:-1]:
896
raise errors.BzrBadParameterContainsNewline("lines")
898
def get_parent_map(self, keys):
899
"""Get a map of the parents of keys.
901
:param keys: The keys to look up parents for.
902
:return: A mapping from keys to parents. Absent keys are absent from
905
raise NotImplementedError(self.get_parent_map)
907
def get_record_stream(self, keys, ordering, include_delta_closure):
908
"""Get a stream of records for keys.
910
:param keys: The keys to include.
911
:param ordering: Either 'unordered' or 'topological'. A topologically
912
sorted stream has compression parents strictly before their
914
:param include_delta_closure: If True then the closure across any
915
compression parents will be included (in the opaque data).
916
:return: An iterator of ContentFactory objects, each of which is only
917
valid until the iterator is advanced.
919
raise NotImplementedError(self.get_record_stream)
921
def get_sha1s(self, keys):
922
"""Get the sha1's of the texts for the given keys.
924
:param keys: The names of the keys to lookup
925
:return: a dict from key to sha1 digest. Keys of texts which are not
926
present in the store are not present in the returned
929
raise NotImplementedError(self.get_sha1s)
931
has_key = index._has_key_from_parent_map
933
def get_missing_compression_parent_keys(self):
934
"""Return an iterable of keys of missing compression parents.
936
Check this after calling insert_record_stream to find out if there are
937
any missing compression parents. If there are, the records that
938
depend on them are not able to be inserted safely. The precise
939
behaviour depends on the concrete VersionedFiles class in use.
941
Classes that do not support this will raise NotImplementedError.
943
raise NotImplementedError(self.get_missing_compression_parent_keys)
945
def insert_record_stream(self, stream):
946
"""Insert a record stream into this container.
948
:param stream: A stream of records to insert.
950
:seealso VersionedFile.get_record_stream:
952
raise NotImplementedError
954
def iter_lines_added_or_present_in_keys(self, keys, pb=None):
955
"""Iterate over the lines in the versioned files from keys.
957
This may return lines from other keys. Each item the returned
958
iterator yields is a tuple of a line and a text version that that line
959
is present in (not introduced in).
961
Ordering of results is in whatever order is most suitable for the
962
underlying storage format.
964
If a progress bar is supplied, it may be used to indicate progress.
965
The caller is responsible for cleaning up progress bars (because this
969
* Lines are normalised by the underlying store: they will all have \n
971
* Lines are returned in arbitrary order.
973
:return: An iterator over (line, key).
975
raise NotImplementedError(self.iter_lines_added_or_present_in_keys)
978
"""Return a iterable of the keys for all the contained texts."""
979
raise NotImplementedError(self.keys)
981
def make_mpdiffs(self, keys):
982
"""Create multiparent diffs for specified keys."""
983
keys_order = tuple(keys)
984
keys = frozenset(keys)
985
knit_keys = set(keys)
986
parent_map = self.get_parent_map(keys)
987
for parent_keys in parent_map.itervalues():
989
knit_keys.update(parent_keys)
990
missing_keys = keys - set(parent_map)
992
raise errors.RevisionNotPresent(list(missing_keys)[0], self)
993
# We need to filter out ghosts, because we can't diff against them.
994
maybe_ghosts = knit_keys - keys
995
ghosts = maybe_ghosts - set(self.get_parent_map(maybe_ghosts))
996
knit_keys.difference_update(ghosts)
998
chunks_to_lines = osutils.chunks_to_lines
999
for record in self.get_record_stream(knit_keys, 'topological', True):
1000
lines[record.key] = chunks_to_lines(record.get_bytes_as('chunked'))
1001
# line_block_dict = {}
1002
# for parent, blocks in record.extract_line_blocks():
1003
# line_blocks[parent] = blocks
1004
# line_blocks[record.key] = line_block_dict
1006
for key in keys_order:
1008
parents = parent_map[key] or []
1009
# Note that filtering knit_keys can lead to a parent difference
1010
# between the creation and the application of the mpdiff.
1011
parent_lines = [lines[p] for p in parents if p in knit_keys]
1012
if len(parent_lines) > 0:
1013
left_parent_blocks = self._extract_blocks(key, parent_lines[0],
1016
left_parent_blocks = None
1017
diffs.append(multiparent.MultiParent.from_lines(target,
1018
parent_lines, left_parent_blocks))
1021
missing_keys = index._missing_keys_from_parent_map
1023
def _extract_blocks(self, version_id, source, target):
1027
class ThunkedVersionedFiles(VersionedFiles):
1028
"""Storage for many versioned files thunked onto a 'VersionedFile' class.
1030
This object allows a single keyspace for accessing the history graph and
1031
contents of named bytestrings.
1033
Currently no implementation allows the graph of different key prefixes to
1034
intersect, but the API does allow such implementations in the future.
1037
def __init__(self, transport, file_factory, mapper, is_locked):
1038
"""Create a ThunkedVersionedFiles."""
1039
self._transport = transport
1040
self._file_factory = file_factory
1041
self._mapper = mapper
1042
self._is_locked = is_locked
1044
def add_lines(self, key, parents, lines, parent_texts=None,
1045
left_matching_blocks=None, nostore_sha=None, random_id=False,
1046
check_content=True):
1047
"""See VersionedFiles.add_lines()."""
1048
path = self._mapper.map(key)
1049
version_id = key[-1]
1050
parents = [parent[-1] for parent in parents]
1051
vf = self._get_vf(path)
1054
return vf.add_lines_with_ghosts(version_id, parents, lines,
1055
parent_texts=parent_texts,
1056
left_matching_blocks=left_matching_blocks,
1057
nostore_sha=nostore_sha, random_id=random_id,
1058
check_content=check_content)
1059
except NotImplementedError:
1060
return vf.add_lines(version_id, parents, lines,
1061
parent_texts=parent_texts,
1062
left_matching_blocks=left_matching_blocks,
1063
nostore_sha=nostore_sha, random_id=random_id,
1064
check_content=check_content)
1065
except errors.NoSuchFile:
1066
# parent directory may be missing, try again.
1067
self._transport.mkdir(osutils.dirname(path))
1069
return vf.add_lines_with_ghosts(version_id, parents, lines,
1070
parent_texts=parent_texts,
1071
left_matching_blocks=left_matching_blocks,
1072
nostore_sha=nostore_sha, random_id=random_id,
1073
check_content=check_content)
1074
except NotImplementedError:
1075
return vf.add_lines(version_id, parents, lines,
1076
parent_texts=parent_texts,
1077
left_matching_blocks=left_matching_blocks,
1078
nostore_sha=nostore_sha, random_id=random_id,
1079
check_content=check_content)
1081
def annotate(self, key):
1082
"""Return a list of (version-key, line) tuples for the text of key.
1084
:raise RevisionNotPresent: If the key is not present.
1087
path = self._mapper.map(prefix)
1088
vf = self._get_vf(path)
1089
origins = vf.annotate(key[-1])
1091
for origin, line in origins:
1092
result.append((prefix + (origin,), line))
1095
def check(self, progress_bar=None):
1096
"""See VersionedFiles.check()."""
1097
for prefix, vf in self._iter_all_components():
1100
def get_parent_map(self, keys):
1101
"""Get a map of the parents of keys.
1103
:param keys: The keys to look up parents for.
1104
:return: A mapping from keys to parents. Absent keys are absent from
1107
prefixes = self._partition_keys(keys)
1109
for prefix, suffixes in prefixes.items():
1110
path = self._mapper.map(prefix)
1111
vf = self._get_vf(path)
1112
parent_map = vf.get_parent_map(suffixes)
1113
for key, parents in parent_map.items():
1114
result[prefix + (key,)] = tuple(
1115
prefix + (parent,) for parent in parents)
1118
def _get_vf(self, path):
1119
if not self._is_locked():
1120
raise errors.ObjectNotLocked(self)
1121
return self._file_factory(path, self._transport, create=True,
1122
get_scope=lambda:None)
1124
def _partition_keys(self, keys):
1125
"""Turn keys into a dict of prefix:suffix_list."""
1128
prefix_keys = result.setdefault(key[:-1], [])
1129
prefix_keys.append(key[-1])
1132
def _get_all_prefixes(self):
1133
# Identify all key prefixes.
1134
# XXX: A bit hacky, needs polish.
1135
if type(self._mapper) == ConstantMapper:
1136
paths = [self._mapper.map(())]
1140
for quoted_relpath in self._transport.iter_files_recursive():
1141
path, ext = os.path.splitext(quoted_relpath)
1143
paths = list(relpaths)
1144
prefixes = [self._mapper.unmap(path) for path in paths]
1145
return zip(paths, prefixes)
1147
def get_record_stream(self, keys, ordering, include_delta_closure):
1148
"""See VersionedFiles.get_record_stream()."""
1149
# Ordering will be taken care of by each partitioned store; group keys
1152
for prefix, suffixes, vf in self._iter_keys_vf(keys):
1153
suffixes = [(suffix,) for suffix in suffixes]
1154
for record in vf.get_record_stream(suffixes, ordering,
1155
include_delta_closure):
1156
if record.parents is not None:
1157
record.parents = tuple(
1158
prefix + parent for parent in record.parents)
1159
record.key = prefix + record.key
1162
def _iter_keys_vf(self, keys):
1163
prefixes = self._partition_keys(keys)
1165
for prefix, suffixes in prefixes.items():
1166
path = self._mapper.map(prefix)
1167
vf = self._get_vf(path)
1168
yield prefix, suffixes, vf
1170
def get_sha1s(self, keys):
1171
"""See VersionedFiles.get_sha1s()."""
1173
for prefix,suffixes, vf in self._iter_keys_vf(keys):
1174
vf_sha1s = vf.get_sha1s(suffixes)
1175
for suffix, sha1 in vf_sha1s.iteritems():
1176
sha1s[prefix + (suffix,)] = sha1
1179
def insert_record_stream(self, stream):
1180
"""Insert a record stream into this container.
1182
:param stream: A stream of records to insert.
1184
:seealso VersionedFile.get_record_stream:
1186
for record in stream:
1187
prefix = record.key[:-1]
1188
key = record.key[-1:]
1189
if record.parents is not None:
1190
parents = [parent[-1:] for parent in record.parents]
1193
thunk_record = AdapterFactory(key, parents, record)
1194
path = self._mapper.map(prefix)
1195
# Note that this parses the file many times; we can do better but
1196
# as this only impacts weaves in terms of performance, it is
1198
vf = self._get_vf(path)
1199
vf.insert_record_stream([thunk_record])
1201
def iter_lines_added_or_present_in_keys(self, keys, pb=None):
1202
"""Iterate over the lines in the versioned files from keys.
1204
This may return lines from other keys. Each item the returned
1205
iterator yields is a tuple of a line and a text version that that line
1206
is present in (not introduced in).
1208
Ordering of results is in whatever order is most suitable for the
1209
underlying storage format.
1211
If a progress bar is supplied, it may be used to indicate progress.
1212
The caller is responsible for cleaning up progress bars (because this
1216
* Lines are normalised by the underlying store: they will all have \n
1218
* Lines are returned in arbitrary order.
1220
:return: An iterator over (line, key).
1222
for prefix, suffixes, vf in self._iter_keys_vf(keys):
1223
for line, version in vf.iter_lines_added_or_present_in_versions(suffixes):
1224
yield line, prefix + (version,)
1226
def _iter_all_components(self):
1227
for path, prefix in self._get_all_prefixes():
1228
yield prefix, self._get_vf(path)
1231
"""See VersionedFiles.keys()."""
1233
for prefix, vf in self._iter_all_components():
1234
for suffix in vf.versions():
1235
result.add(prefix + (suffix,))
1239
class _PlanMergeVersionedFile(VersionedFiles):
1240
"""A VersionedFile for uncommitted and committed texts.
1242
It is intended to allow merges to be planned with working tree texts.
1243
It implements only the small part of the VersionedFiles interface used by
1244
PlanMerge. It falls back to multiple versionedfiles for data not stored in
1245
_PlanMergeVersionedFile itself.
1247
:ivar: fallback_versionedfiles a list of VersionedFiles objects that can be
1248
queried for missing texts.
1251
def __init__(self, file_id):
1252
"""Create a _PlanMergeVersionedFile.
1254
:param file_id: Used with _PlanMerge code which is not yet fully
1255
tuple-keyspace aware.
1257
self._file_id = file_id
1258
# fallback locations
1259
self.fallback_versionedfiles = []
1260
# Parents for locally held keys.
1262
# line data for locally held keys.
1264
# key lookup providers
1265
self._providers = [DictParentsProvider(self._parents)]
1267
def plan_merge(self, ver_a, ver_b, base=None):
1268
"""See VersionedFile.plan_merge"""
1269
from bzrlib.merge import _PlanMerge
1271
return _PlanMerge(ver_a, ver_b, self, (self._file_id,)).plan_merge()
1272
old_plan = list(_PlanMerge(ver_a, base, self, (self._file_id,)).plan_merge())
1273
new_plan = list(_PlanMerge(ver_a, ver_b, self, (self._file_id,)).plan_merge())
1274
return _PlanMerge._subtract_plans(old_plan, new_plan)
1276
def plan_lca_merge(self, ver_a, ver_b, base=None):
1277
from bzrlib.merge import _PlanLCAMerge
1279
new_plan = _PlanLCAMerge(ver_a, ver_b, self, (self._file_id,), graph).plan_merge()
1282
old_plan = _PlanLCAMerge(ver_a, base, self, (self._file_id,), graph).plan_merge()
1283
return _PlanLCAMerge._subtract_plans(list(old_plan), list(new_plan))
1285
def add_lines(self, key, parents, lines):
1286
"""See VersionedFiles.add_lines
1288
Lines are added locally, not to fallback versionedfiles. Also, ghosts
1289
are permitted. Only reserved ids are permitted.
1291
if type(key) is not tuple:
1292
raise TypeError(key)
1293
if not revision.is_reserved_id(key[-1]):
1294
raise ValueError('Only reserved ids may be used')
1296
raise ValueError('Parents may not be None')
1298
raise ValueError('Lines may not be None')
1299
self._parents[key] = tuple(parents)
1300
self._lines[key] = lines
1302
def get_record_stream(self, keys, ordering, include_delta_closure):
1305
if key in self._lines:
1306
lines = self._lines[key]
1307
parents = self._parents[key]
1309
yield ChunkedContentFactory(key, parents, None, lines)
1310
for versionedfile in self.fallback_versionedfiles:
1311
for record in versionedfile.get_record_stream(
1312
pending, 'unordered', True):
1313
if record.storage_kind == 'absent':
1316
pending.remove(record.key)
1320
# report absent entries
1322
yield AbsentContentFactory(key)
1324
def get_parent_map(self, keys):
1325
"""See VersionedFiles.get_parent_map"""
1326
# We create a new provider because a fallback may have been added.
1327
# If we make fallbacks private we can update a stack list and avoid
1328
# object creation thrashing.
1331
if revision.NULL_REVISION in keys:
1332
keys.remove(revision.NULL_REVISION)
1333
result[revision.NULL_REVISION] = ()
1334
self._providers = self._providers[:1] + self.fallback_versionedfiles
1336
_StackedParentsProvider(self._providers).get_parent_map(keys))
1337
for key, parents in result.iteritems():
1339
result[key] = (revision.NULL_REVISION,)
1343
501
class PlanWeaveMerge(TextMerge):
1344
502
"""Weave merge that takes a plan as its input.
1346
504
This exists so that VersionedFile.plan_merge is implementable.
1347
505
Most callers will want to use WeaveMerge instead.
1397
555
elif state == 'new-b':
1399
557
lines_b.append(line)
1400
elif state == 'conflicted-a':
1402
lines_a.append(line)
1403
elif state == 'conflicted-b':
1405
lines_b.append(line)
1406
elif state == 'killed-both':
1407
# This counts as a change, even though there is no associated
1411
if state not in ('irrelevant', 'ghost-a', 'ghost-b',
1413
raise AssertionError(state)
559
assert state in ('irrelevant', 'ghost-a', 'ghost-b',
560
'killed-base', 'killed-both'), state
1414
561
for struct in outstanding_struct():
1418
565
class WeaveMerge(PlanWeaveMerge):
1419
"""Weave merge that takes a VersionedFile and two versions as its input."""
566
"""Weave merge that takes a VersionedFile and two versions as its input"""
1421
def __init__(self, versionedfile, ver_a, ver_b,
568
def __init__(self, versionedfile, ver_a, ver_b,
1422
569
a_marker=PlanWeaveMerge.A_MARKER, b_marker=PlanWeaveMerge.B_MARKER):
1423
570
plan = versionedfile.plan_merge(ver_a, ver_b)
1424
571
PlanWeaveMerge.__init__(self, plan, a_marker, b_marker)
1427
class VirtualVersionedFiles(VersionedFiles):
1428
"""Dummy implementation for VersionedFiles that uses other functions for
1429
obtaining fulltexts and parent maps.
1431
This is always on the bottom of the stack and uses string keys
1432
(rather than tuples) internally.
574
class InterVersionedFile(InterObject):
575
"""This class represents operations taking place between two versionedfiles..
577
Its instances have methods like join, and contain
578
references to the source and target versionedfiles these operations can be
581
Often we will provide convenience methods on 'versionedfile' which carry out
582
operations with another versionedfile - they will always forward to
583
InterVersionedFile.get(other).method_name(parameters).
1435
def __init__(self, get_parent_map, get_lines):
1436
"""Create a VirtualVersionedFiles.
1438
:param get_parent_map: Same signature as Repository.get_parent_map.
1439
:param get_lines: Should return lines for specified key or None if
1442
super(VirtualVersionedFiles, self).__init__()
1443
self._get_parent_map = get_parent_map
1444
self._get_lines = get_lines
1446
def check(self, progressbar=None):
1447
"""See VersionedFiles.check.
1449
:note: Always returns True for VirtualVersionedFiles.
1453
def add_mpdiffs(self, records):
1454
"""See VersionedFiles.mpdiffs.
1456
:note: Not implemented for VirtualVersionedFiles.
1458
raise NotImplementedError(self.add_mpdiffs)
1460
def get_parent_map(self, keys):
1461
"""See VersionedFiles.get_parent_map."""
1462
return dict([((k,), tuple([(p,) for p in v]))
1463
for k,v in self._get_parent_map([k for (k,) in keys]).iteritems()])
1465
def get_sha1s(self, keys):
1466
"""See VersionedFiles.get_sha1s."""
1469
lines = self._get_lines(k)
1470
if lines is not None:
1471
if not isinstance(lines, list):
1472
raise AssertionError
1473
ret[(k,)] = osutils.sha_strings(lines)
1476
def get_record_stream(self, keys, ordering, include_delta_closure):
1477
"""See VersionedFiles.get_record_stream."""
1478
for (k,) in list(keys):
1479
lines = self._get_lines(k)
1480
if lines is not None:
1481
if not isinstance(lines, list):
1482
raise AssertionError
1483
yield ChunkedContentFactory((k,), None,
1484
sha1=osutils.sha_strings(lines),
587
"""The available optimised InterVersionedFile types."""
589
def join(self, pb=None, msg=None, version_ids=None, ignore_missing=False):
590
"""Integrate versions from self.source into self.target.
592
If version_ids is None all versions from source should be
593
incorporated into this versioned file.
595
Must raise RevisionNotPresent if any of the specified versions
596
are not present in the other files history unless ignore_missing is
597
supplied when they are silently skipped.
600
# - if the target is empty, just add all the versions from
601
# source to target, otherwise:
602
# - make a temporary versioned file of type target
603
# - insert the source content into it one at a time
605
if not self.target.versions():
608
# Make a new target-format versioned file.
609
temp_source = self.target.create_empty("temp", MemoryTransport())
611
version_ids = self._get_source_version_ids(version_ids, ignore_missing)
612
graph = self.source.get_graph(version_ids)
613
order = tsort.topo_sort(graph.items())
614
pb = ui.ui_factory.nested_progress_bar()
617
# TODO for incremental cross-format work:
618
# make a versioned file with the following content:
619
# all revisions we have been asked to join
620
# all their ancestors that are *not* in target already.
621
# the immediate parents of the above two sets, with
622
# empty parent lists - these versions are in target already
623
# and the incorrect version data will be ignored.
624
# TODO: for all ancestors that are present in target already,
625
# check them for consistent data, this requires moving sha1 from
627
# TODO: remove parent texts when they are not relevant any more for
628
# memory pressure reduction. RBC 20060313
629
# pb.update('Converting versioned data', 0, len(order))
630
# deltas = self.source.get_deltas(order)
631
for index, version in enumerate(order):
632
pb.update('Converting versioned data', index, len(order))
633
parent_text = target.add_lines(version,
634
self.source.get_parents(version),
635
self.source.get_lines(version),
636
parent_texts=parent_texts)
637
parent_texts[version] = parent_text
638
#delta_parent, sha1, noeol, delta = deltas[version]
639
#target.add_delta(version,
640
# self.source.get_parents(version),
645
#target.get_lines(version)
647
# this should hit the native code path for target
648
if target is not self.target:
649
return self.target.join(temp_source,
657
def _get_source_version_ids(self, version_ids, ignore_missing):
658
"""Determine the version ids to be used from self.source.
660
:param version_ids: The caller-supplied version ids to check. (None
661
for all). If None is in version_ids, it is stripped.
662
:param ignore_missing: if True, remove missing ids from the version
663
list. If False, raise RevisionNotPresent on
664
a missing version id.
665
:return: A set of version ids.
667
if version_ids is None:
668
# None cannot be in source.versions
669
return set(self.source.versions())
671
version_ids = [osutils.safe_revision_id(v) for v in version_ids]
673
return set(self.source.versions()).intersection(set(version_ids))
1487
yield AbsentContentFactory((k,))
1489
def iter_lines_added_or_present_in_keys(self, keys, pb=None):
1490
"""See VersionedFile.iter_lines_added_or_present_in_versions()."""
1491
for i, (key,) in enumerate(keys):
1493
pb.update("Finding changed lines", i, len(keys))
1494
for l in self._get_lines(key):
1498
def network_bytes_to_kind_and_offset(network_bytes):
1499
"""Strip of a record kind from the front of network_bytes.
1501
:param network_bytes: The bytes of a record.
1502
:return: A tuple (storage_kind, offset_of_remaining_bytes)
1504
line_end = network_bytes.find('\n')
1505
storage_kind = network_bytes[:line_end]
1506
return storage_kind, line_end + 1
1509
class NetworkRecordStream(object):
1510
"""A record_stream which reconstitures a serialised stream."""
1512
def __init__(self, bytes_iterator):
1513
"""Create a NetworkRecordStream.
1515
:param bytes_iterator: An iterator of bytes. Each item in this
1516
iterator should have been obtained from a record_streams'
1517
record.get_bytes_as(record.storage_kind) call.
1519
self._bytes_iterator = bytes_iterator
1520
self._kind_factory = {'knit-ft-gz':knit.knit_network_to_record,
1521
'knit-delta-gz':knit.knit_network_to_record,
1522
'knit-annotated-ft-gz':knit.knit_network_to_record,
1523
'knit-annotated-delta-gz':knit.knit_network_to_record,
1524
'knit-delta-closure':knit.knit_delta_closure_to_records,
1525
'fulltext':fulltext_network_to_record,
1526
'groupcompress-block':groupcompress.network_block_to_records,
1532
:return: An iterator as per VersionedFiles.get_record_stream().
1534
for bytes in self._bytes_iterator:
1535
storage_kind, line_end = network_bytes_to_kind_and_offset(bytes)
1536
for record in self._kind_factory[storage_kind](
1537
storage_kind, bytes, line_end):
1541
def fulltext_network_to_record(kind, bytes, line_end):
1542
"""Convert a network fulltext record to record."""
1543
meta_len, = struct.unpack('!L', bytes[line_end:line_end+4])
1544
record_meta = bytes[line_end+4:line_end+4+meta_len]
1545
key, parents = bencode.bdecode_as_tuple(record_meta)
1546
if parents == 'nil':
1548
fulltext = bytes[line_end+4+meta_len:]
1549
return [FulltextContentFactory(key, parents, None, fulltext)]
1552
def _length_prefix(bytes):
1553
return struct.pack('!L', len(bytes))
1556
def record_to_fulltext_bytes(record):
1557
if record.parents is None:
1560
parents = record.parents
1561
record_meta = bencode.bencode((record.key, parents))
1562
record_content = record.get_bytes_as('fulltext')
1563
return "fulltext\n%s%s%s" % (
1564
_length_prefix(record_meta), record_meta, record_content)
1567
def sort_groupcompress(parent_map):
1568
"""Sort and group the keys in parent_map into groupcompress order.
1570
groupcompress is defined (currently) as reverse-topological order, grouped
1573
:return: A sorted-list of keys
1575
# gc-optimal ordering is approximately reverse topological,
1576
# properly grouped by file-id.
1578
for item in parent_map.iteritems():
1580
if isinstance(key, str) or len(key) == 1:
1585
per_prefix_map[prefix].append(item)
1587
per_prefix_map[prefix] = [item]
1590
for prefix in sorted(per_prefix_map):
1591
present_keys.extend(reversed(tsort.topo_sort(per_prefix_map[prefix])))
675
new_version_ids = set()
676
for version in version_ids:
679
if not self.source.has_version(version):
680
raise errors.RevisionNotPresent(version, str(self.source))
682
new_version_ids.add(version)
683
return new_version_ids
686
class InterVersionedFileTestProviderAdapter(object):
687
"""A tool to generate a suite testing multiple inter versioned-file classes.
689
This is done by copying the test once for each InterVersionedFile provider
690
and injecting the transport_server, transport_readonly_server,
691
versionedfile_factory and versionedfile_factory_to classes into each copy.
692
Each copy is also given a new id() to make it easy to identify.
695
def __init__(self, transport_server, transport_readonly_server, formats):
696
self._transport_server = transport_server
697
self._transport_readonly_server = transport_readonly_server
698
self._formats = formats
700
def adapt(self, test):
701
result = unittest.TestSuite()
702
for (interversionedfile_class,
703
versionedfile_factory,
704
versionedfile_factory_to) in self._formats:
705
new_test = deepcopy(test)
706
new_test.transport_server = self._transport_server
707
new_test.transport_readonly_server = self._transport_readonly_server
708
new_test.interversionedfile_class = interversionedfile_class
709
new_test.versionedfile_factory = versionedfile_factory
710
new_test.versionedfile_factory_to = versionedfile_factory_to
711
def make_new_test_id():
712
new_id = "%s(%s)" % (new_test.id(), interversionedfile_class.__name__)
713
return lambda: new_id
714
new_test.id = make_new_test_id()
715
result.addTest(new_test)
719
def default_test_list():
720
"""Generate the default list of interversionedfile permutations to test."""
721
from bzrlib.weave import WeaveFile
722
from bzrlib.knit import KnitVersionedFile
724
# test the fallback InterVersionedFile from annotated knits to weave
725
result.append((InterVersionedFile,
728
for optimiser in InterVersionedFile._optimisers:
729
result.append((optimiser,
730
optimiser._matching_file_from_factory,
731
optimiser._matching_file_to_factory
733
# if there are specific combinations we want to use, we can add them
added
removed
bzrlib/versionedfile.py
