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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
from __future__ import absolute_import
# XXX: Some consideration of the problems that might occur if there are
# files whose id differs only in case. That should probably be forbidden.
import os
from warnings import warn
from bzrlib import (
errors,
osutils,
)
from bzrlib.store import TransportStore
from bzrlib.trace import mutter
import bzrlib.ui
class VersionedFileStore(TransportStore):
"""Collection of many versioned files in a transport."""
# TODO: Rather than passing versionedfile_kwargs, perhaps pass in a
# transport factory callable?
def __init__(self, transport, prefixed=False, precious=False,
dir_mode=None, file_mode=None,
versionedfile_class=None,
versionedfile_kwargs={},
escaped=False):
super(VersionedFileStore, self).__init__(transport,
dir_mode=dir_mode, file_mode=file_mode,
prefixed=prefixed, compressed=False, escaped=escaped)
self._precious = precious
self._versionedfile_class = versionedfile_class
self._versionedfile_kwargs = versionedfile_kwargs
# Used for passing get_scope to versioned file constructors;
self.get_scope = None
def filename(self, file_id):
"""Return the path relative to the transport root."""
return self._relpath(file_id)
def __iter__(self):
suffixes = self._versionedfile_class.get_suffixes()
ids = set()
for relpath in self._iter_files_recursive():
for suffix in suffixes:
if relpath.endswith(suffix):
# TODO: use standard remove_suffix function
escaped_id = os.path.basename(relpath[:-len(suffix)])
file_id = self._mapper.unmap(escaped_id)[0]
if file_id not in ids:
ids.add(file_id)
yield file_id
break # only one suffix can match
def has_id(self, file_id):
suffixes = self._versionedfile_class.get_suffixes()
filename = self.filename(file_id)
for suffix in suffixes:
if not self._transport.has(filename + suffix):
return False
return True
def get_empty(self, file_id, transaction):
"""Get an empty weave, which implies deleting the existing one first."""
if self.has_id(file_id):
self.delete(file_id, transaction)
return self.get_weave_or_empty(file_id, transaction)
def delete(self, file_id, transaction):
"""Remove file_id from the store."""
suffixes = self._versionedfile_class.get_suffixes()
filename = self.filename(file_id)
for suffix in suffixes:
self._transport.delete(filename + suffix)
def _get(self, file_id):
return self._transport.get(self.filename(file_id))
def _put(self, file_id, f):
fn = self.filename(file_id)
try:
return self._transport.put_file(fn, f, mode=self._file_mode)
except errors.NoSuchFile:
if not self._prefixed:
raise
self._transport.mkdir(os.path.dirname(fn), mode=self._dir_mode)
return self._transport.put_file(fn, f, mode=self._file_mode)
def get_weave(self, file_id, transaction, _filename=None):
"""Return the VersionedFile for file_id.
:param _filename: filename that would be returned from self.filename for
file_id. This is used to reduce duplicate filename calculations when
using 'get_weave_or_empty'. FOR INTERNAL USE ONLY.
"""
if _filename is None:
_filename = self.filename(file_id)
if transaction.writeable():
w = self._versionedfile_class(_filename, self._transport, self._file_mode,
get_scope=self.get_scope, **self._versionedfile_kwargs)
else:
w = self._versionedfile_class(_filename,
self._transport,
self._file_mode,
create=False,
access_mode='r',
get_scope=self.get_scope,
**self._versionedfile_kwargs)
return w
def _make_new_versionedfile(self, file_id, transaction,
known_missing=False, _filename=None):
"""Make a new versioned file.
:param _filename: filename that would be returned from self.filename for
file_id. This is used to reduce duplicate filename calculations when
using 'get_weave_or_empty'. FOR INTERNAL USE ONLY.
"""
if not known_missing and self.has_id(file_id):
self.delete(file_id, transaction)
if _filename is None:
_filename = self.filename(file_id)
try:
# we try without making the directory first because thats optimising
# for the common case.
weave = self._versionedfile_class(_filename, self._transport, self._file_mode, create=True,
get_scope=self.get_scope, **self._versionedfile_kwargs)
except errors.NoSuchFile:
if not self._prefixed:
# unexpected error - NoSuchFile is expected to be raised on a
# missing dir only and that only occurs when we are prefixed.
raise
dirname = osutils.dirname(_filename)
self._transport.mkdir(dirname, mode=self._dir_mode)
weave = self._versionedfile_class(_filename, self._transport,
self._file_mode, create=True,
get_scope=self.get_scope,
**self._versionedfile_kwargs)
return weave
def get_weave_or_empty(self, file_id, transaction):
"""Return a weave, or an empty one if it doesn't exist."""
# This is typically used from 'commit' and 'fetch/push/pull' where
# we scan across many versioned files once. As such the small overhead
# of calculating the filename before doing a cache lookup is more than
# compensated for by not calculating the filename when making new
# versioned files.
_filename = self.filename(file_id)
try:
return self.get_weave(file_id, transaction, _filename=_filename)
except errors.NoSuchFile:
weave = self._make_new_versionedfile(file_id, transaction,
known_missing=True, _filename=_filename)
return weave
def _put_weave(self, file_id, weave, transaction):
"""Preserved here for upgrades-to-weaves to use."""
myweave = self._make_new_versionedfile(file_id, transaction)
myweave.insert_record_stream(weave.get_record_stream(
[(version,) for version in weave.versions()],
'topological', False))
def copy_all_ids(self, store_from, pb=None, from_transaction=None,
to_transaction=None):
"""Copy all the file ids from store_from into self."""
if from_transaction is None:
warn("Please pass from_transaction into "
"versioned_store.copy_all_ids.", stacklevel=2)
if to_transaction is None:
warn("Please pass to_transaction into "
"versioned_store.copy_all_ids.", stacklevel=2)
if not store_from.listable():
raise errors.UnlistableStore(store_from)
ids = []
for count, file_id in enumerate(store_from):
if pb:
pb.update('listing files', count, count)
ids.append(file_id)
if pb:
pb.clear()
mutter('copy_all ids: %r', ids)
self.copy_multi(store_from, ids, pb=pb,
from_transaction=from_transaction,
to_transaction=to_transaction)
def copy_multi(self, from_store, file_ids, pb=None, from_transaction=None,
to_transaction=None):
"""Copy all the versions for multiple file_ids from from_store.
:param from_transaction: required current transaction in from_store.
"""
from bzrlib.transactions import PassThroughTransaction
if from_transaction is None:
warn("VersionedFileStore.copy_multi without a from_transaction parameter "
"is deprecated. Please provide a from_transaction.",
DeprecationWarning,
stacklevel=2)
# we are reading one object - caching is irrelevant.
from_transaction = PassThroughTransaction()
if to_transaction is None:
warn("VersionedFileStore.copy_multi without a to_transaction parameter "
"is deprecated. Please provide a to_transaction.",
DeprecationWarning,
stacklevel=2)
# we are copying single objects, and there may be open tranasactions
# so again with the passthrough
to_transaction = PassThroughTransaction()
pb = bzrlib.ui.ui_factory.nested_progress_bar()
try:
for count, f in enumerate(file_ids):
mutter("copy weave {%s} into %s", f, self)
pb.update('copy', count, len(file_ids))
# if we have it in cache, its faster.
# joining is fast with knits, and bearable for weaves -
# indeed the new case can be optimised if needed.
target = self._make_new_versionedfile(f, to_transaction)
source = from_store.get_weave(f, from_transaction)
target.insert_record_stream(source.get_record_stream(
[(version,) for version in source.versions()],
'topological', False))
finally:
pb.finished()
def total_size(self):
count, bytes = super(VersionedFileStore, self).total_size()
return (count / len(self._versionedfile_class.get_suffixes())), bytes
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