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# (C) 2005 Canonical Development 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
# 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.]*)\n$')
CHANGESET_OLD_HEADER_RE = re.compile(r'^# Bazaar-NG changeset v(?P<version>\d+[\w.]*)\n$')
_serializers = {}
def _get_filename(f):
if hasattr(f, 'name'):
return f.name
return '<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:
version = m.group('version')
break
elif line.startswith(BUNDLE_HEADER):
raise errors.MalformedHeader()
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 not _serializers.has_key(version):
raise errors.BundleNotSupported(version, 'version not listed in known versions')
serializer = _serializers[version](version)
return serializer.read(f)
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
"""
if not _serializers.has_key(version):
raise errors.BundleNotSupported(version, 'unknown bundle format')
serializer = _serializers[version](version)
return serializer.write(source, revision_ids, forced_bases, f)
def write_bundle(repository, revision_id, base_revision_id, out):
""""""
if base_revision_id is NULL_REVISION:
base_revision_id = None
base_ancestry = set(repository.get_ancestry(base_revision_id))
revision_ids = [r for r in repository.get_ancestry(revision_id) if r
not in base_ancestry]
revision_ids = list(reversed(revision_ids))
write(repository, revision_ids, out,
forced_bases = {revision_id:base_revision_id})
return revision_ids
def format_highres_date(t, offset=0):
"""Format a date, such that it includes higher precision in the
seconds field.
:param t: The local time in fractional seconds since the epoch
:type t: float
:param offset: The timezone offset in integer seconds
:type offset: int
Example: format_highres_date(time.time(), -time.timezone)
this will return a date stamp for right now,
formatted for the local timezone.
>>> from bzrlib.osutils import format_date
>>> format_date(1120153132.350850105, 0)
'Thu 2005-06-30 17:38:52 +0000'
>>> format_highres_date(1120153132.350850105, 0)
'Thu 2005-06-30 17:38:52.350850105 +0000'
>>> format_date(1120153132.350850105, -5*3600)
'Thu 2005-06-30 12:38:52 -0500'
>>> format_highres_date(1120153132.350850105, -5*3600)
'Thu 2005-06-30 12:38:52.350850105 -0500'
>>> format_highres_date(1120153132.350850105, 7200)
'Thu 2005-06-30 19:38:52.350850105 +0200'
>>> format_highres_date(1152428738.867522, 19800)
'Sun 2006-07-09 12:35:38.867522001 +0530'
"""
import time
assert isinstance(t, float)
# This has to be formatted for "original" date, so that the
# revision XML entry will be reproduced faithfully.
if offset == None:
offset = 0
tt = time.gmtime(t + offset)
return (time.strftime("%a %Y-%m-%d %H:%M:%S", tt)
+ ('%.9f' % (t - int(t)))[1:] # Get the high-res seconds, but ignore the 0
+ ' %+03d%02d' % (offset / 3600, (offset / 60) % 60))
def unpack_highres_date(date):
"""This takes the high-resolution date stamp, and
converts it back into the tuple (timestamp, timezone)
Where timestamp is in real UTC since epoch seconds, and timezone is an integer
number of seconds offset.
:param date: A date formated by format_highres_date
:type date: string
>>> import time, random
>>> unpack_highres_date('Thu 2005-06-30 12:38:52.350850105 -0500')
(1120153132.3508501, -18000)
>>> unpack_highres_date('Thu 2005-06-30 17:38:52.350850105 +0000')
(1120153132.3508501, 0)
>>> unpack_highres_date('Thu 2005-06-30 19:38:52.350850105 +0200')
(1120153132.3508501, 7200)
>>> unpack_highres_date('Sun 2006-07-09 12:35:38.867522001 +0530')
(1152428738.867522, 19800)
>>> from bzrlib.osutils import local_time_offset
>>> t = time.time()
>>> o = local_time_offset()
>>> t2, o2 = unpack_highres_date(format_highres_date(t, o))
>>> t == t2
True
>>> o == o2
True
>>> t -= 24*3600*365*2 # Start 2 years ago
>>> o = -12*3600
>>> for count in xrange(500):
... t += random.random()*24*3600*30
... o = ((o/3600 + 13) % 25 - 12)*3600 # Add 1 wrap around from [-12, 12]
... date = format_highres_date(t, o)
... t2, o2 = unpack_highres_date(date)
... if t != t2 or o != o2:
... print 'Failed on date %r, %s,%s diff:%s' % (date, t, o, t2-t)
... break
"""
import time, calendar
# Up until the first period is a datestamp that is generated
# as normal from time.strftime, so use time.strptime to
# parse it
dot_loc = date.find('.')
if dot_loc == -1:
raise ValueError('Date string does not contain high-precision seconds: %r' % date)
base_time = time.strptime(date[:dot_loc], "%a %Y-%m-%d %H:%M:%S")
fract_seconds, offset = date[dot_loc:].split()
fract_seconds = float(fract_seconds)
offset = int(offset)
hours = int(offset / 100)
minutes = (offset % 100)
seconds_offset = (hours * 3600) + (minutes * 60)
# time.mktime returns localtime, but calendar.timegm returns UTC time
timestamp = calendar.timegm(base_time)
timestamp -= seconds_offset
# Add back in the fractional seconds
timestamp += fract_seconds
return (timestamp, seconds_offset)
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(self, source, revision_ids, forced_bases, f):
"""Write the bundle to the supplied file.
:param source: A source for revision information
:param revision_ids: The list of revision ids to serialize
:param forced_bases: A dict of revision -> base that overrides default
:param f: The file to output to
"""
raise NotImplementedError
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 not _serializers.has_key(version):
_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(None, 'bzrlib.bundle.serializer.v08', 'BundleSerializerV08')
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