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# Copyright (C) 2005 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# XXX: Some consideration of the problems that might occur if there are
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# 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 bzrlib.weavefile import read_weave, write_weave_v5
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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.errors import NoSuchFile, FileExists
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from bzrlib.trace import mutter
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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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dir_mode=None, file_mode=None):
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super(WeaveStore, self).__init__(transport,
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dir_mode=dir_mode, file_mode=file_mode,
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prefixed=prefixed, compressed=False)
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self._precious = precious
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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 hash_prefix(file_id) + urllib.quote(file_id) + WeaveStore.FILE_SUFFIX
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return urllib.quote(file_id) + WeaveStore.FILE_SUFFIX
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l = len(WeaveStore.FILE_SUFFIX)
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for relpath in self._iter_files_recursive():
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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 has_id(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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# less round trips to mkdir on failure than mkdir always
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return self._transport.put(self.filename(file_id), f, mode=self._file_mode)
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if not self._prefixed:
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self._transport.mkdir(hash_prefix(file_id), mode=self._dir_mode)
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return self._transport.put(self.filename(file_id), f, mode=self._file_mode)
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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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# TODO: jam 20051219 This should check if there is a prelude
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# which is already cached, and if so, should remove it
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# But transaction doesn't seem to have a 'remove'
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# One workaround would be to re-add the object with
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def get_weave_prelude(self, file_id, transaction):
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weave = transaction.map.find_weave(weave_id)
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mutter("cache hit in %s for %s", self, weave_id)
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# We want transactions to also cache preludes if that
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# is all that we are loading. So we need a unique
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# identifier, so that someone who wants the whole text
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# won't get just the prelude
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weave_id = 'PRELUDE-' + file_id
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weave = transaction.map.find_weave(weave_id)
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mutter("cache hit in %s for %s", self, weave_id)
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w = read_weave(self._get(file_id), prelude=True)
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transaction.map.add_weave(weave_id, w)
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transaction.register_clean(w, precious=self._precious)
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def get_lines(self, file_id, rev_id, transaction):
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"""Return text from a particular version of a weave.
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Returned as a list of lines."""
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w = self.get_weave(file_id, transaction)
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return w.get(w.lookup(rev_id))
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def get_weave_prelude_or_empty(self, file_id, transaction):
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"""cheap version that reads the prelude but not the lines
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return self.get_weave_prelude(file_id, transaction)
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# We can cache here, because we know that there
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# is no complete object, since we got NoSuchFile
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weave = Weave(weave_name=file_id)
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transaction.map.add_weave(file_id, weave)
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transaction.register_clean(weave, precious=self._precious)
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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."""
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return self.get_weave(file_id, transaction)
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weave = Weave(weave_name=file_id)
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transaction.map.add_weave(file_id, weave)
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transaction.register_clean(weave, precious=self._precious)
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def put_weave(self, file_id, weave, transaction):
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"""Write back a modified weave"""
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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):
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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)
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self.put_weave(file_id, w, transaction)
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def add_identical_text(self, file_id, old_rev_id, new_rev_id, parents,
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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_identical(old_rev_id, new_rev_id, parent_idxs)
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self.put_weave(file_id, w, transaction)
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def copy_multi(self, from_store, file_ids):
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assert isinstance(from_store, WeaveStore)
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mutter("copy weave {%s} into %s", f, self)
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self._put(f, from_store._get(f))
added
removed
bzrlib/store/weave.py
