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# Copyright (C) 2006-2010 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Server-side repository related request implmentations."""
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from bzrlib.bzrdir import BzrDir
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from bzrlib.smart.request import (
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FailedSmartServerResponse,
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SuccessfulSmartServerResponse,
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from bzrlib.repository import _strip_NULL_ghosts, network_format_registry
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from bzrlib import revision as _mod_revision
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from bzrlib.versionedfile import (
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record_to_fulltext_bytes,
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class SmartServerRepositoryRequest(SmartServerRequest):
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"""Common base class for Repository requests."""
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def do(self, path, *args):
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"""Execute a repository request.
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All Repository requests take a path to the repository as their first
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argument. The repository must be at the exact path given by the
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client - no searching is done.
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The actual logic is delegated to self.do_repository_request.
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:param client_path: The path for the repository as received from the
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:return: A SmartServerResponse from self.do_repository_request().
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transport = self.transport_from_client_path(path)
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bzrdir = BzrDir.open_from_transport(transport)
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# Save the repository for use with do_body.
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self._repository = bzrdir.open_repository()
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return self.do_repository_request(self._repository, *args)
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def do_repository_request(self, repository, *args):
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"""Override to provide an implementation for a verb."""
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# No-op for verbs that take bodies (None as a result indicates a body
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def recreate_search(self, repository, search_bytes, discard_excess=False):
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"""Recreate a search from its serialised form.
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:param discard_excess: If True, and the search refers to data we don't
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have, just silently accept that fact - the verb calling
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recreate_search trusts that clients will look for missing things
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they expected and get it from elsewhere.
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lines = search_bytes.split('\n')
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if lines[0] == 'ancestry-of':
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search_result = graph.PendingAncestryResult(heads, repository)
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return search_result, None
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elif lines[0] == 'search':
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return self.recreate_search_from_recipe(repository, lines[1:],
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discard_excess=discard_excess)
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return (None, FailedSmartServerResponse(('BadSearch',)))
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def recreate_search_from_recipe(self, repository, lines,
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discard_excess=False):
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"""Recreate a specific revision search (vs a from-tip search).
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:param discard_excess: If True, and the search refers to data we don't
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have, just silently accept that fact - the verb calling
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recreate_search trusts that clients will look for missing things
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they expected and get it from elsewhere.
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start_keys = set(lines[0].split(' '))
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exclude_keys = set(lines[1].split(' '))
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revision_count = int(lines[2])
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repository.lock_read()
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search = repository.get_graph()._make_breadth_first_searcher(
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next_revs = search.next()
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except StopIteration:
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search.stop_searching_any(exclude_keys.intersection(next_revs))
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search_result = search.get_result()
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if (not discard_excess and
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search_result.get_recipe()[3] != revision_count):
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# we got back a different amount of data than expected, this
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# gets reported as NoSuchRevision, because less revisions
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# indicates missing revisions, and more should never happen as
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# the excludes list considers ghosts and ensures that ghost
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# filling races are not a problem.
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return (None, FailedSmartServerResponse(('NoSuchRevision',)))
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return (search_result, None)
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class SmartServerRepositoryReadLocked(SmartServerRepositoryRequest):
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"""Calls self.do_readlocked_repository_request."""
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def do_repository_request(self, repository, *args):
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"""Read lock a repository for do_readlocked_repository_request."""
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repository.lock_read()
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return self.do_readlocked_repository_request(repository, *args)
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class SmartServerRepositoryGetParentMap(SmartServerRepositoryRequest):
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"""Bzr 1.2+ - get parent data for revisions during a graph search."""
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no_extra_results = False
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def do_repository_request(self, repository, *revision_ids):
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"""Get parent details for some revisions.
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All the parents for revision_ids are returned. Additionally up to 64KB
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of additional parent data found by performing a breadth first search
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from revision_ids is returned. The verb takes a body containing the
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current search state, see do_body for details.
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If 'include-missing:' is in revision_ids, ghosts encountered in the
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graph traversal for getting parent data are included in the result with
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a prefix of 'missing:'.
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:param repository: The repository to query in.
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:param revision_ids: The utf8 encoded revision_id to answer for.
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self._revision_ids = revision_ids
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return None # Signal that we want a body.
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def do_body(self, body_bytes):
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"""Process the current search state and perform the parent lookup.
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:return: A smart server response where the body contains an utf8
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encoded flattened list of the parents of the revisions (the same
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format as Repository.get_revision_graph) which has been bz2
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repository = self._repository
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repository.lock_read()
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return self._do_repository_request(body_bytes)
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def _do_repository_request(self, body_bytes):
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repository = self._repository
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revision_ids = set(self._revision_ids)
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include_missing = 'include-missing:' in revision_ids
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revision_ids.remove('include-missing:')
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body_lines = body_bytes.split('\n')
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search_result, error = self.recreate_search_from_recipe(
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repository, body_lines)
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if error is not None:
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# TODO might be nice to start up the search again; but thats not
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# written or tested yet.
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client_seen_revs = set(search_result.get_keys())
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# Always include the requested ids.
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client_seen_revs.difference_update(revision_ids)
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repo_graph = repository.get_graph()
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next_revs = revision_ids
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first_loop_done = False
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queried_revs.update(next_revs)
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parent_map = repo_graph.get_parent_map(next_revs)
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current_revs = next_revs
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for revision_id in current_revs:
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parents = parent_map.get(revision_id)
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if parents is not None:
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# adjust for the wire
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if parents == (_mod_revision.NULL_REVISION,):
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# prepare the next query
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next_revs.update(parents)
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encoded_id = revision_id
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encoded_id = "missing:" + revision_id
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if (revision_id not in client_seen_revs and
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(not missing_rev or include_missing)):
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# Client does not have this revision, give it to it.
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# add parents to the result
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result[encoded_id] = parents
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# Approximate the serialized cost of this revision_id.
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size_so_far += 2 + len(encoded_id) + sum(map(len, parents))
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# get all the directly asked for parents, and then flesh out to
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# 64K (compressed) or so. We do one level of depth at a time to
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# stay in sync with the client. The 250000 magic number is
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# estimated compression ratio taken from bzr.dev itself.
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if self.no_extra_results or (
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first_loop_done and size_so_far > 250000):
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# don't query things we've already queried
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next_revs.difference_update(queried_revs)
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first_loop_done = True
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# sorting trivially puts lexographically similar revision ids together.
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for revision, parents in sorted(result.items()):
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lines.append(' '.join((revision, ) + tuple(parents)))
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return SuccessfulSmartServerResponse(
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('ok', ), bz2.compress('\n'.join(lines)))
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class SmartServerRepositoryGetRevisionGraph(SmartServerRepositoryReadLocked):
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def do_readlocked_repository_request(self, repository, revision_id):
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"""Return the result of repository.get_revision_graph(revision_id).
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Deprecated as of bzr 1.4, but supported for older clients.
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:param repository: The repository to query in.
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:param revision_id: The utf8 encoded revision_id to get a graph from.
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:return: A smart server response where the body contains an utf8
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encoded flattened list of the revision graph.
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graph = repository.get_graph()
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search_ids = [revision_id]
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search_ids = repository.all_revision_ids()
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search = graph._make_breadth_first_searcher(search_ids)
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transitive_ids = set()
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map(transitive_ids.update, list(search))
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parent_map = graph.get_parent_map(transitive_ids)
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revision_graph = _strip_NULL_ghosts(parent_map)
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if revision_id and revision_id not in revision_graph:
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# Note that we return an empty body, rather than omitting the body.
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# This way the client knows that it can always expect to find a body
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# in the response for this method, even in the error case.
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return FailedSmartServerResponse(('nosuchrevision', revision_id), '')
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for revision, parents in revision_graph.items():
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lines.append(' '.join((revision, ) + tuple(parents)))
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return SuccessfulSmartServerResponse(('ok', ), '\n'.join(lines))
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class SmartServerRepositoryGetRevIdForRevno(SmartServerRepositoryReadLocked):
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def do_readlocked_repository_request(self, repository, revno,
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"""Find the revid for a given revno, given a known revno/revid pair.
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found_flag, result = repository.get_rev_id_for_revno(revno, known_pair)
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except errors.RevisionNotPresent, err:
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if err.revision_id != known_pair[1]:
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raise AssertionError(
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'get_rev_id_for_revno raised RevisionNotPresent for '
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'non-initial revision: ' + err.revision_id)
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return FailedSmartServerResponse(
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('nosuchrevision', err.revision_id))
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return SuccessfulSmartServerResponse(('ok', result))
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earliest_revno, earliest_revid = result
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return SuccessfulSmartServerResponse(
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('history-incomplete', earliest_revno, earliest_revid))
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class SmartServerRequestHasRevision(SmartServerRepositoryRequest):
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def do_repository_request(self, repository, revision_id):
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"""Return ok if a specific revision is in the repository at path.
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:param repository: The repository to query in.
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:param revision_id: The utf8 encoded revision_id to lookup.
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:return: A smart server response of ('ok', ) if the revision is
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if repository.has_revision(revision_id):
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return SuccessfulSmartServerResponse(('yes', ))
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return SuccessfulSmartServerResponse(('no', ))
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class SmartServerRepositoryGatherStats(SmartServerRepositoryRequest):
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def do_repository_request(self, repository, revid, committers):
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"""Return the result of repository.gather_stats().
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:param repository: The repository to query in.
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:param revid: utf8 encoded rev id or an empty string to indicate None
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:param committers: 'yes' or 'no'.
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:return: A SmartServerResponse ('ok',), a encoded body looking like
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latestrev: 345.700 3600
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But containing only fields returned by the gather_stats() call
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decoded_revision_id = None
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decoded_revision_id = revid
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if committers == 'yes':
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decoded_committers = True
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decoded_committers = None
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stats = repository.gather_stats(decoded_revision_id, decoded_committers)
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if stats.has_key('committers'):
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body += 'committers: %d\n' % stats['committers']
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if stats.has_key('firstrev'):
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body += 'firstrev: %.3f %d\n' % stats['firstrev']
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if stats.has_key('latestrev'):
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body += 'latestrev: %.3f %d\n' % stats['latestrev']
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if stats.has_key('revisions'):
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body += 'revisions: %d\n' % stats['revisions']
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if stats.has_key('size'):
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body += 'size: %d\n' % stats['size']
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return SuccessfulSmartServerResponse(('ok', ), body)
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class SmartServerRepositoryIsShared(SmartServerRepositoryRequest):
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def do_repository_request(self, repository):
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"""Return the result of repository.is_shared().
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:param repository: The repository to query in.
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:return: A smart server response of ('yes', ) if the repository is
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shared, and ('no', ) if it is not.
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if repository.is_shared():
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return SuccessfulSmartServerResponse(('yes', ))
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return SuccessfulSmartServerResponse(('no', ))
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class SmartServerRepositoryLockWrite(SmartServerRepositoryRequest):
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def do_repository_request(self, repository, token=''):
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# XXX: this probably should not have a token.
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token = repository.lock_write(token=token)
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except errors.LockContention, e:
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return FailedSmartServerResponse(('LockContention',))
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except errors.UnlockableTransport:
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return FailedSmartServerResponse(('UnlockableTransport',))
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except errors.LockFailed, e:
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return FailedSmartServerResponse(('LockFailed',
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str(e.lock), str(e.why)))
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if token is not None:
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repository.leave_lock_in_place()
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return SuccessfulSmartServerResponse(('ok', token))
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class SmartServerRepositoryGetStream(SmartServerRepositoryRequest):
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def do_repository_request(self, repository, to_network_name):
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"""Get a stream for inserting into a to_format repository.
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:param repository: The repository to stream from.
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:param to_network_name: The network name of the format of the target
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self._to_format = network_format_registry.get(to_network_name)
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if self._should_fake_unknown():
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return FailedSmartServerResponse(
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('UnknownMethod', 'Repository.get_stream'))
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return None # Signal that we want a body.
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def _should_fake_unknown(self):
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"""Return True if we should return UnknownMethod to the client.
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This is a workaround for bugs in pre-1.19 clients that claim to
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support receiving streams of CHK repositories. The pre-1.19 client
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expects inventory records to be serialized in the format defined by
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to_network_name, but in pre-1.19 (at least) that format definition
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tries to use the xml5 serializer, which does not correctly handle
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rich-roots. After 1.19 the client can also accept inventory-deltas
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(which avoids this issue), and those clients will use the
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Repository.get_stream_1.19 verb instead of this one.
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So: if this repository is CHK, and the to_format doesn't match,
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we should just fake an UnknownSmartMethod error so that the client
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will fallback to VFS, rather than sending it a stream we know it
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from_format = self._repository._format
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to_format = self._to_format
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if not from_format.supports_chks:
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# Source not CHK: that's ok
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if (to_format.supports_chks and
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from_format.repository_class is to_format.repository_class and
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from_format._serializer == to_format._serializer):
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# Source is CHK, but target matches: that's ok
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# (e.g. 2a->2a, or CHK2->2a)
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# Source is CHK, and target is not CHK or incompatible CHK. We can't
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# generate a compatible stream.
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def do_body(self, body_bytes):
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repository = self._repository
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repository.lock_read()
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search_result, error = self.recreate_search(repository, body_bytes,
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if error is not None:
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source = repository._get_source(self._to_format)
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stream = source.get_stream(search_result)
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exc_info = sys.exc_info()
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# On non-error, unlocking is done by the body stream handler.
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raise exc_info[0], exc_info[1], exc_info[2]
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return SuccessfulSmartServerResponse(('ok',),
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body_stream=self.body_stream(stream, repository))
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def body_stream(self, stream, repository):
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byte_stream = _stream_to_byte_stream(stream, repository._format)
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for bytes in byte_stream:
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except errors.RevisionNotPresent, e:
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# This shouldn't be able to happen, but as we don't buffer
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# everything it can in theory happen.
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yield FailedSmartServerResponse(('NoSuchRevision', e.revision_id))
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class SmartServerRepositoryGetStream_1_19(SmartServerRepositoryGetStream):
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def _should_fake_unknown(self):
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"""Returns False; we don't need to workaround bugs in 1.19+ clients."""
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def _stream_to_byte_stream(stream, src_format):
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"""Convert a record stream to a self delimited byte stream."""
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pack_writer = pack.ContainerSerialiser()
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yield pack_writer.begin()
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yield pack_writer.bytes_record(src_format.network_name(), '')
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for substream_type, substream in stream:
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if substream_type == 'inventory-deltas':
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# This doesn't feel like the ideal place to issue this warning;
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# however we don't want to do it in the Repository that's
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# generating the stream, because that might be on the server.
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# Instead we try to observe it as the stream goes by.
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ui.ui_factory.warn_cross_format_fetch(src_format,
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for record in substream:
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if record.storage_kind in ('chunked', 'fulltext'):
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serialised = record_to_fulltext_bytes(record)
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elif record.storage_kind == 'inventory-delta':
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serialised = record_to_inventory_delta_bytes(record)
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elif record.storage_kind == 'absent':
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raise ValueError("Absent factory for %s" % (record.key,))
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serialised = record.get_bytes_as(record.storage_kind)
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# Some streams embed the whole stream into the wire
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# representation of the first record, which means that
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# later records have no wire representation: we skip them.
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yield pack_writer.bytes_record(serialised, [(substream_type,)])
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yield pack_writer.end()
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class _ByteStreamDecoder(object):
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"""Helper for _byte_stream_to_stream.
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The expected usage of this class is via the function _byte_stream_to_stream
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which creates a _ByteStreamDecoder, pops off the stream format and then
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yields the output of record_stream(), the main entry point to
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Broadly this class has to unwrap two layers of iterators:
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This is complicated by wishing to return type, iterator_for_type, but
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getting the data for iterator_for_type when we find out type: we can't
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simply pass a generator down to the NetworkRecordStream parser, instead
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we have a little local state to seed each NetworkRecordStream instance,
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and gather the type that we'll be yielding.
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:ivar byte_stream: The byte stream being decoded.
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:ivar stream_decoder: A pack parser used to decode the bytestream
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:ivar current_type: The current type, used to join adjacent records of the
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same type into a single stream.
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:ivar first_bytes: The first bytes to give the next NetworkRecordStream.
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def __init__(self, byte_stream):
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"""Create a _ByteStreamDecoder."""
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self.stream_decoder = pack.ContainerPushParser()
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self.current_type = None
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self.first_bytes = None
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self.byte_stream = byte_stream
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def iter_stream_decoder(self):
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"""Iterate the contents of the pack from stream_decoder."""
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# dequeue pending items
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for record in self.stream_decoder.read_pending_records():
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# Pull bytes of the wire, decode them to records, yield those records.
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for bytes in self.byte_stream:
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self.stream_decoder.accept_bytes(bytes)
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for record in self.stream_decoder.read_pending_records():
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def iter_substream_bytes(self):
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if self.first_bytes is not None:
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yield self.first_bytes
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# If we run out of pack records, single the outer layer to stop.
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self.first_bytes = None
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for record in self.iter_pack_records:
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record_names, record_bytes = record
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record_name, = record_names
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substream_type = record_name[0]
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if substream_type != self.current_type:
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# end of a substream, seed the next substream.
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self.current_type = substream_type
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self.first_bytes = record_bytes
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def record_stream(self):
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"""Yield substream_type, substream from the byte stream."""
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# Make and consume sub generators, one per substream type:
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while self.first_bytes is not None:
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substream = NetworkRecordStream(self.iter_substream_bytes())
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# after substream is fully consumed, self.current_type is set to
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# the next type, and self.first_bytes is set to the matching bytes.
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yield self.current_type, substream.read()
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def seed_state(self):
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"""Prepare the _ByteStreamDecoder to decode from the pack stream."""
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# Set a single generator we can use to get data from the pack stream.
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self.iter_pack_records = self.iter_stream_decoder()
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# Seed the very first subiterator with content; after this each one
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list(self.iter_substream_bytes())
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def _byte_stream_to_stream(byte_stream):
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"""Convert a byte stream into a format and a stream.
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:param byte_stream: A bytes iterator, as output by _stream_to_byte_stream.
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:return: (RepositoryFormat, stream_generator)
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decoder = _ByteStreamDecoder(byte_stream)
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for bytes in byte_stream:
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decoder.stream_decoder.accept_bytes(bytes)
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for record in decoder.stream_decoder.read_pending_records(max=1):
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record_names, src_format_name = record
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src_format = network_format_registry.get(src_format_name)
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return src_format, decoder.record_stream()
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class SmartServerRepositoryUnlock(SmartServerRepositoryRequest):
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def do_repository_request(self, repository, token):
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repository.lock_write(token=token)
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except errors.TokenMismatch, e:
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return FailedSmartServerResponse(('TokenMismatch',))
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repository.dont_leave_lock_in_place()
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return SuccessfulSmartServerResponse(('ok',))
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class SmartServerRepositorySetMakeWorkingTrees(SmartServerRepositoryRequest):
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def do_repository_request(self, repository, str_bool_new_value):
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if str_bool_new_value == 'True':
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repository.set_make_working_trees(new_value)
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return SuccessfulSmartServerResponse(('ok',))
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class SmartServerRepositoryTarball(SmartServerRepositoryRequest):
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"""Get the raw repository files as a tarball.
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The returned tarball contains a .bzr control directory which in turn
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contains a repository.
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This takes one parameter, compression, which currently must be
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This is used to implement the Repository.copy_content_into operation.
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def do_repository_request(self, repository, compression):
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tmp_dirname, tmp_repo = self._copy_to_tempdir(repository)
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controldir_name = tmp_dirname + '/.bzr'
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return self._tarfile_response(controldir_name, compression)
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osutils.rmtree(tmp_dirname)
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def _copy_to_tempdir(self, from_repo):
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tmp_dirname = osutils.mkdtemp(prefix='tmpbzrclone')
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tmp_bzrdir = from_repo.bzrdir._format.initialize(tmp_dirname)
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tmp_repo = from_repo._format.initialize(tmp_bzrdir)
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from_repo.copy_content_into(tmp_repo)
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return tmp_dirname, tmp_repo
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def _tarfile_response(self, tmp_dirname, compression):
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temp = tempfile.NamedTemporaryFile()
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self._tarball_of_dir(tmp_dirname, compression, temp.file)
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# all finished; write the tempfile out to the network
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return SuccessfulSmartServerResponse(('ok',), temp.read())
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# FIXME: Don't read the whole thing into memory here; rather stream
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# it out from the file onto the network. mbp 20070411
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def _tarball_of_dir(self, dirname, compression, ofile):
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filename = os.path.basename(ofile.name)
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tarball = tarfile.open(fileobj=ofile, name=filename,
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mode='w|' + compression)
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# The tarball module only accepts ascii names, and (i guess)
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# packs them with their 8bit names. We know all the files
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# within the repository have ASCII names so the should be safe
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dirname = dirname.encode(sys.getfilesystemencoding())
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# python's tarball module includes the whole path by default so
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if not dirname.endswith('.bzr'):
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raise ValueError(dirname)
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tarball.add(dirname, '.bzr') # recursive by default
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class SmartServerRepositoryInsertStreamLocked(SmartServerRepositoryRequest):
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"""Insert a record stream from a RemoteSink into a repository.
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This gets bytes pushed to it by the network infrastructure and turns that
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into a bytes iterator using a thread. That is then processed by
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_byte_stream_to_stream.
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def do_repository_request(self, repository, resume_tokens, lock_token):
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"""StreamSink.insert_stream for a remote repository."""
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repository.lock_write(token=lock_token)
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self.do_insert_stream_request(repository, resume_tokens)
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def do_insert_stream_request(self, repository, resume_tokens):
720
tokens = [token for token in resume_tokens.split(' ') if token]
722
self.repository = repository
723
self.queue = Queue.Queue()
724
self.insert_thread = threading.Thread(target=self._inserter_thread)
725
self.insert_thread.start()
727
def do_chunk(self, body_stream_chunk):
728
self.queue.put(body_stream_chunk)
730
def _inserter_thread(self):
732
src_format, stream = _byte_stream_to_stream(
733
self.blocking_byte_stream())
734
self.insert_result = self.repository._get_sink().insert_stream(
735
stream, src_format, self.tokens)
736
self.insert_ok = True
738
self.insert_exception = sys.exc_info()
739
self.insert_ok = False
741
def blocking_byte_stream(self):
743
bytes = self.queue.get()
744
if bytes is StopIteration:
750
self.queue.put(StopIteration)
751
if self.insert_thread is not None:
752
self.insert_thread.join()
753
if not self.insert_ok:
754
exc_info = self.insert_exception
755
raise exc_info[0], exc_info[1], exc_info[2]
756
write_group_tokens, missing_keys = self.insert_result
757
if write_group_tokens or missing_keys:
758
# bzip needed? missing keys should typically be a small set.
759
# Should this be a streaming body response ?
760
missing_keys = sorted(missing_keys)
761
bytes = bencode.bencode((write_group_tokens, missing_keys))
762
self.repository.unlock()
763
return SuccessfulSmartServerResponse(('missing-basis', bytes))
765
self.repository.unlock()
766
return SuccessfulSmartServerResponse(('ok', ))
769
class SmartServerRepositoryInsertStream_1_19(SmartServerRepositoryInsertStreamLocked):
770
"""Insert a record stream from a RemoteSink into a repository.
772
Same as SmartServerRepositoryInsertStreamLocked, except:
773
- the lock token argument is optional
774
- servers that implement this verb accept 'inventory-delta' records in the
780
def do_repository_request(self, repository, resume_tokens, lock_token=None):
781
"""StreamSink.insert_stream for a remote repository."""
782
SmartServerRepositoryInsertStreamLocked.do_repository_request(
783
self, repository, resume_tokens, lock_token)
786
class SmartServerRepositoryInsertStream(SmartServerRepositoryInsertStreamLocked):
787
"""Insert a record stream from a RemoteSink into an unlocked repository.
789
This is the same as SmartServerRepositoryInsertStreamLocked, except it
790
takes no lock_tokens; i.e. it works with an unlocked (or lock-free, e.g.
791
like pack format) repository.
796
def do_repository_request(self, repository, resume_tokens):
797
"""StreamSink.insert_stream for a remote repository."""
798
repository.lock_write()
799
self.do_insert_stream_request(repository, resume_tokens)
added
removed
bzrlib/smart/repository.py
