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20
# files whose id differs only in case. That should probably be forbidden.
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from cStringIO import StringIO
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from cStringIO import StringIO
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from warnings import warn
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27
from bzrlib.weavefile import read_weave, write_weave_v5
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from bzrlib.weave import WeaveFile, Weave
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from bzrlib.store import TransportStore
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from bzrlib.weave import Weave
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from bzrlib.store import TransportStore, hash_prefix
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from bzrlib.atomicfile import AtomicFile
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from bzrlib.symbol_versioning import (deprecated_method,
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from bzrlib.errors import NoSuchFile, FileExists
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from bzrlib.trace import mutter
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class VersionedFileStore(TransportStore):
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"""Collection of many versioned files in a transport."""
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# TODO: Rather than passing versionedfile_kwargs, perhaps pass in a
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# transport factory callable?
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def __init__(self, transport, prefixed=False, precious=False,
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dir_mode=None, file_mode=None,
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versionedfile_class=WeaveFile,
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versionedfile_kwargs={},
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super(VersionedFileStore, self).__init__(transport,
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dir_mode=dir_mode, file_mode=file_mode,
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prefixed=prefixed, compressed=False, escaped=escaped)
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class WeaveStore(TransportStore):
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"""Collection of several weave files in a directory.
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This has some shortcuts for reading and writing them.
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FILE_SUFFIX = '.weave'
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def __init__(self, transport, prefixed=False, precious=False):
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self._transport = transport
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self._prefixed = prefixed
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self._precious = precious
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self._versionedfile_class = versionedfile_class
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self._versionedfile_kwargs = versionedfile_kwargs
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# Used for passing get_scope to versioned file constructors;
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def filename(self, file_id):
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"""Return the path relative to the transport root."""
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return self._relpath(file_id)
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return hash_prefix(file_id) + file_id + WeaveStore.FILE_SUFFIX
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return file_id + WeaveStore.FILE_SUFFIX
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def __iter__(self):
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suffixes = self._versionedfile_class.get_suffixes()
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for relpath in self._iter_files_recursive():
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for suffix in suffixes:
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if relpath.endswith(suffix):
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# TODO: use standard remove_suffix function
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escaped_id = os.path.basename(relpath[:-len(suffix)])
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file_id = self._mapper.unmap(escaped_id)[0]
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if file_id not in ids:
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break # only one suffix can match
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def has_id(self, file_id):
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suffixes = self._versionedfile_class.get_suffixes()
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filename = self.filename(file_id)
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for suffix in suffixes:
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if not self._transport.has(filename + suffix):
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def get_empty(self, file_id, transaction):
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"""Get an empty weave, which implies deleting the existing one first."""
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if self.has_id(file_id):
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self.delete(file_id, transaction)
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return self.get_weave_or_empty(file_id, transaction)
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def delete(self, file_id, transaction):
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"""Remove file_id from the store."""
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suffixes = self._versionedfile_class.get_suffixes()
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filename = self.filename(file_id)
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for suffix in suffixes:
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self._transport.delete(filename + suffix)
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l = len(WeaveStore.FILE_SUFFIX)
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for relpath, st in self._iter_relpaths():
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if relpath.endswith(WeaveStore.FILE_SUFFIX):
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yield os.path.basename(relpath[:-l])
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def __contains__(self, fileid):
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return self._transport.has(self.filename(fileid))
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def _get(self, file_id):
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return self._transport.get(self.filename(file_id))
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def _put(self, file_id, f):
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fn = self.filename(file_id)
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return self._transport.put_file(fn, f, mode=self._file_mode)
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except errors.NoSuchFile:
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if not self._prefixed:
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self._transport.mkdir(os.path.dirname(fn), mode=self._dir_mode)
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return self._transport.put_file(fn, f, mode=self._file_mode)
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def get_weave(self, file_id, transaction, _filename=None):
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"""Return the VersionedFile for file_id.
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:param _filename: filename that would be returned from self.filename for
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file_id. This is used to reduce duplicate filename calculations when
116
using 'get_weave_or_empty'. FOR INTERNAL USE ONLY.
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if _filename is None:
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_filename = self.filename(file_id)
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if transaction.writeable():
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w = self._versionedfile_class(_filename, self._transport, self._file_mode,
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get_scope=self.get_scope, **self._versionedfile_kwargs)
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w = self._versionedfile_class(_filename,
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get_scope=self.get_scope,
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**self._versionedfile_kwargs)
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self._transport.mkdir(hash_prefix(file_id))
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return self._transport.put(self.filename(file_id), f)
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def get_weave(self, file_id, transaction):
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weave = transaction.map.find_weave(file_id)
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mutter("cache hit in %s for %s", self, file_id)
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w = read_weave(self._get(file_id))
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transaction.map.add_weave(file_id, w)
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transaction.register_clean(w, precious=self._precious)
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def _make_new_versionedfile(self, file_id, transaction,
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known_missing=False, _filename=None):
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"""Make a new versioned file.
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:param _filename: filename that would be returned from self.filename for
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file_id. This is used to reduce duplicate filename calculations when
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using 'get_weave_or_empty'. FOR INTERNAL USE ONLY.
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if not known_missing and self.has_id(file_id):
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self.delete(file_id, transaction)
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if _filename is None:
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_filename = self.filename(file_id)
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# we try without making the directory first because thats optimising
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# for the common case.
148
weave = self._versionedfile_class(_filename, self._transport, self._file_mode, create=True,
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get_scope=self.get_scope, **self._versionedfile_kwargs)
150
except errors.NoSuchFile:
151
if not self._prefixed:
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# unexpected error - NoSuchFile is expected to be raised on a
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# missing dir only and that only occurs when we are prefixed.
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dirname = osutils.dirname(_filename)
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self._transport.mkdir(dirname, mode=self._dir_mode)
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weave = self._versionedfile_class(_filename, self._transport,
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self._file_mode, create=True,
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get_scope=self.get_scope,
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**self._versionedfile_kwargs)
85
def get_lines(self, file_id, rev_id, transaction):
86
"""Return text from a particular version of a weave.
88
Returned as a list of lines."""
89
w = self.get_weave(file_id, transaction)
90
return w.get(w.lookup(rev_id))
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def get_weave_or_empty(self, file_id, transaction):
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"""Return a weave, or an empty one if it doesn't exist."""
165
# This is typically used from 'commit' and 'fetch/push/pull' where
166
# we scan across many versioned files once. As such the small overhead
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# of calculating the filename before doing a cache lookup is more than
168
# compensated for by not calculating the filename when making new
170
_filename = self.filename(file_id)
93
"""Return a weave, or an empty one if it doesn't exist."""
172
return self.get_weave(file_id, transaction, _filename=_filename)
173
except errors.NoSuchFile:
174
weave = self._make_new_versionedfile(file_id, transaction,
175
known_missing=True, _filename=_filename)
95
return self.get_weave(file_id, transaction)
97
weave = Weave(weave_name=file_id)
98
transaction.map.add_weave(file_id, weave)
99
transaction.register_clean(weave, precious=self._precious)
178
def _put_weave(self, file_id, weave, transaction):
179
"""Preserved here for upgrades-to-weaves to use."""
180
myweave = self._make_new_versionedfile(file_id, transaction)
181
myweave.insert_record_stream(weave.get_record_stream(
182
[(version,) for version in weave.versions()],
183
'topological', False))
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def copy_all_ids(self, store_from, pb=None, from_transaction=None,
186
to_transaction=None):
187
"""Copy all the file ids from store_from into self."""
188
if from_transaction is None:
189
warn("Please pass from_transaction into "
190
"versioned_store.copy_all_ids.", stacklevel=2)
191
if to_transaction is None:
192
warn("Please pass to_transaction into "
193
"versioned_store.copy_all_ids.", stacklevel=2)
194
if not store_from.listable():
195
raise errors.UnlistableStore(store_from)
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for count, file_id in enumerate(store_from):
199
pb.update('listing files', count, count)
203
mutter('copy_all ids: %r', ids)
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self.copy_multi(store_from, ids, pb=pb,
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from_transaction=from_transaction,
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to_transaction=to_transaction)
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def copy_multi(self, from_store, file_ids, pb=None, from_transaction=None,
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to_transaction=None):
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"""Copy all the versions for multiple file_ids from from_store.
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def put_weave(self, file_id, weave, transaction):
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"""Write back a modified weave"""
104
transaction.register_dirty(weave)
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# TODO FOR WRITE TRANSACTIONS: this should be done in a callback
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# from the transaction, when it decides to save.
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write_weave_v5(weave, sio)
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self._put(file_id, sio)
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def add_text(self, file_id, rev_id, new_lines, parents, transaction):
113
w = self.get_weave_or_empty(file_id, transaction)
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parent_idxs = map(w.lookup, parents)
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w.add(rev_id, parent_idxs, new_lines)
116
self.put_weave(file_id, w, transaction)
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:param from_transaction: required current transaction in from_store.
214
from bzrlib.transactions import PassThroughTransaction
215
if from_transaction is None:
216
warn("WeaveStore.copy_multi without a from_transaction parameter "
217
"is deprecated. Please provide a from_transaction.",
220
# we are reading one object - caching is irrelevant.
221
from_transaction = PassThroughTransaction()
222
if to_transaction is None:
223
warn("WeaveStore.copy_multi without a to_transaction parameter "
224
"is deprecated. Please provide a to_transaction.",
227
# we are copying single objects, and there may be open tranasactions
228
# so again with the passthrough
229
to_transaction = PassThroughTransaction()
230
pb = bzrlib.ui.ui_factory.nested_progress_bar()
232
for count, f in enumerate(file_ids):
233
mutter("copy weave {%s} into %s", f, self)
234
pb.update('copy', count, len(file_ids))
235
# if we have it in cache, its faster.
236
# joining is fast with knits, and bearable for weaves -
237
# indeed the new case can be optimised if needed.
238
target = self._make_new_versionedfile(f, to_transaction)
239
source = from_store.get_weave(f, from_transaction)
240
target.insert_record_stream(source.get_record_stream(
241
[(version,) for version in source.versions()],
242
'topological', False))
246
def total_size(self):
247
count, bytes = super(VersionedFileStore, self).total_size()
248
return (count / len(self._versionedfile_class.get_suffixes())), bytes
250
WeaveStore = VersionedFileStore
118
def add_identical_text(self, file_id, old_rev_id, new_rev_id, parents,
120
w = self.get_weave_or_empty(file_id, transaction)
121
parent_idxs = map(w.lookup, parents)
122
w.add_identical(old_rev_id, new_rev_id, parent_idxs)
123
self.put_weave(file_id, w, transaction)
125
def copy_multi(self, from_store, file_ids):
126
assert isinstance(from_store, WeaveStore)
128
mutter("copy weave {%s} into %s", f, self)
129
self._put(f, from_store._get(f))
added
removed
bzrlib/store/weave.py
