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# Copyright (C) 2005, 2006 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Serializer factory for reading and writing bundles.
"""
import base64
from StringIO import StringIO
import re
import bzrlib.errors as errors
from bzrlib.diff import internal_diff
from bzrlib.revision import NULL_REVISION
# For backwards-compatibility
from bzrlib.timestamp import unpack_highres_date, format_highres_date
# New bundles should try to use this header format
BUNDLE_HEADER = '# Bazaar revision bundle v'
BUNDLE_HEADER_RE = re.compile(
r'^# Bazaar revision bundle v(?P<version>\d+[\w.]*)(?P<lineending>\r?)\n$')
CHANGESET_OLD_HEADER_RE = re.compile(
r'^# Bazaar-NG changeset v(?P<version>\d+[\w.]*)(?P<lineending>\r?)\n$')
_serializers = {}
v4_string = '4'
def _get_bundle_header(version):
return '%s%s\n' % (BUNDLE_HEADER, version)
def _get_filename(f):
return getattr(f, 'name', '<unknown>')
def read_bundle(f):
"""Read in a bundle from a filelike object.
:param f: A file-like object
:return: A list of Bundle objects
"""
version = None
for line in f:
m = BUNDLE_HEADER_RE.match(line)
if m:
if m.group('lineending') != '':
raise errors.UnsupportedEOLMarker()
version = m.group('version')
break
elif line.startswith(BUNDLE_HEADER):
raise errors.MalformedHeader(
'Extra characters after version number')
m = CHANGESET_OLD_HEADER_RE.match(line)
if m:
version = m.group('version')
raise errors.BundleNotSupported(version,
'old format bundles not supported')
if version is None:
raise errors.NotABundle('Did not find an opening header')
# Now we have a version, to figure out how to read the bundle
if version not in _serializers:
raise errors.BundleNotSupported(version,
'version not listed in known versions')
serializer = _serializers[version](version)
return serializer.read(f)
def get_serializer(version):
try:
return _serializers[version](version)
except KeyError:
raise errors.BundleNotSupported(version, 'unknown bundle format')
def write(source, revision_ids, f, version=None, forced_bases={}):
"""Serialize a list of bundles to a filelike object.
:param source: A source for revision information
:param revision_ids: The list of revision ids to serialize
:param f: The file to output to
:param version: [optional] target serialization version
"""
source.lock_read()
try:
return get_serializer(version).write(source, revision_ids,
forced_bases, f)
finally:
source.unlock()
def write_bundle(repository, revision_id, base_revision_id, out, format=None):
"""Write a bundle of revisions.
:param repository: Repository containing revisions to serialize.
:param revision_id: Head revision_id of the bundle.
:param base_revision_id: Revision assumed to be present in repositories
applying the bundle.
:param out: Output file.
"""
repository.lock_read()
try:
return get_serializer(format).write_bundle(repository, revision_id,
base_revision_id, out)
finally:
repository.unlock()
class BundleSerializer(object):
"""The base class for Serializers.
Common functionality should be included here.
"""
def __init__(self, version):
self.version = version
def read(self, f):
"""Read the rest of the bundles from the supplied file.
:param f: The file to read from
:return: A list of bundle trees
"""
raise NotImplementedError
def write_bundle(self, repository, target, base, fileobj):
"""Write the bundle to the supplied file.
:param repository: The repository to retrieve revision data from
:param target: The revision to provide data for
:param base: The most recent of ancestor of the revision that does not
need to be included in the bundle
:param fileobj: The file to output to
"""
raise NotImplementedError
def _write_bundle(self, repository, revision_id, base_revision_id, out):
"""Helper function for translating write_bundle to write"""
forced_bases = {revision_id:base_revision_id}
if base_revision_id is NULL_REVISION:
base_revision_id = None
revision_ids = set(repository.get_ancestry(revision_id,
topo_sorted=False))
revision_ids.difference_update(repository.get_ancestry(
base_revision_id, topo_sorted=False))
revision_ids = list(repository.get_graph().iter_topo_order(
revision_ids))
revision_ids.reverse()
self.write(repository, revision_ids, forced_bases, out)
return revision_ids
def register(version, klass, overwrite=False):
"""Register a BundleSerializer version.
:param version: The version associated with this format
:param klass: The class to instantiate, which must take a version argument
"""
global _serializers
if overwrite:
_serializers[version] = klass
return
if version not in _serializers:
_serializers[version] = klass
def register_lazy(version, module, classname, overwrite=False):
"""Register lazy-loaded bundle serializer.
:param version: The version associated with this reader
:param module: String indicating what module should be loaded
:param classname: Name of the class that will be instantiated
:param overwrite: Should this version override a default
"""
def _loader(version):
mod = __import__(module, globals(), locals(), [classname])
klass = getattr(mod, classname)
return klass(version)
register(version, _loader, overwrite=overwrite)
def binary_diff(old_filename, old_lines, new_filename, new_lines, to_file):
temp = StringIO()
internal_diff(old_filename, old_lines, new_filename, new_lines, temp,
allow_binary=True)
temp.seek(0)
base64.encode(temp, to_file)
to_file.write('\n')
register_lazy('0.8', 'bzrlib.bundle.serializer.v08', 'BundleSerializerV08')
register_lazy('0.9', 'bzrlib.bundle.serializer.v09', 'BundleSerializerV09')
register_lazy(v4_string, 'bzrlib.bundle.serializer.v4',
'BundleSerializerV4')
register_lazy(None, 'bzrlib.bundle.serializer.v4', 'BundleSerializerV4')
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