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# Copyright (C) 2006-2010 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
"""VFS operations for the smart server.
This module defines the smart server methods that are low-level file operations
-- i.e. methods that operate directly on files and directories, rather than
higher-level concepts like branches and revisions.
These methods, plus 'hello' and 'get_bundle', are version 1 of the smart server
protocol, as implemented in bzr 0.11 and later.
"""
from __future__ import absolute_import
import os
from bzrlib import errors
from bzrlib import urlutils
from bzrlib.smart import request
def _deserialise_optional_mode(mode):
# XXX: FIXME this should be on the protocol object. Later protocol versions
# might serialise modes differently.
if mode == '':
return None
else:
return int(mode)
def vfs_enabled():
"""Is the VFS enabled ?
the VFS is disabled when the BZR_NO_SMART_VFS environment variable is set.
:return: True if it is enabled.
"""
return not 'BZR_NO_SMART_VFS' in os.environ
class VfsRequest(request.SmartServerRequest):
"""Base class for VFS requests.
VFS requests are disabled if vfs_enabled() returns False.
"""
def _check_enabled(self):
if not vfs_enabled():
raise errors.DisabledMethod(self.__class__.__name__)
def translate_client_path(self, relpath):
# VFS requests are made with escaped paths so the escaping done in
# SmartServerRequest.translate_client_path leads to double escaping.
# Remove it here -- the fact that the result is still escaped means
# that the str() will not fail on valid input.
x = request.SmartServerRequest.translate_client_path(self, relpath)
return str(urlutils.unescape(x))
class HasRequest(VfsRequest):
def do(self, relpath):
relpath = self.translate_client_path(relpath)
r = self._backing_transport.has(relpath) and 'yes' or 'no'
return request.SuccessfulSmartServerResponse((r,))
class GetRequest(VfsRequest):
def do(self, relpath):
relpath = self.translate_client_path(relpath)
backing_bytes = self._backing_transport.get_bytes(relpath)
return request.SuccessfulSmartServerResponse(('ok',), backing_bytes)
class AppendRequest(VfsRequest):
def do(self, relpath, mode):
relpath = self.translate_client_path(relpath)
self._relpath = relpath
self._mode = _deserialise_optional_mode(mode)
def do_body(self, body_bytes):
old_length = self._backing_transport.append_bytes(
self._relpath, body_bytes, self._mode)
return request.SuccessfulSmartServerResponse(('appended', '%d' % old_length))
class DeleteRequest(VfsRequest):
def do(self, relpath):
relpath = self.translate_client_path(relpath)
self._backing_transport.delete(relpath)
return request.SuccessfulSmartServerResponse(('ok', ))
class IterFilesRecursiveRequest(VfsRequest):
def do(self, relpath):
if not relpath.endswith('/'):
relpath += '/'
relpath = self.translate_client_path(relpath)
transport = self._backing_transport.clone(relpath)
filenames = transport.iter_files_recursive()
return request.SuccessfulSmartServerResponse(('names',) + tuple(filenames))
class ListDirRequest(VfsRequest):
def do(self, relpath):
if not relpath.endswith('/'):
relpath += '/'
relpath = self.translate_client_path(relpath)
filenames = self._backing_transport.list_dir(relpath)
return request.SuccessfulSmartServerResponse(('names',) + tuple(filenames))
class MkdirRequest(VfsRequest):
def do(self, relpath, mode):
relpath = self.translate_client_path(relpath)
self._backing_transport.mkdir(relpath,
_deserialise_optional_mode(mode))
return request.SuccessfulSmartServerResponse(('ok',))
class MoveRequest(VfsRequest):
def do(self, rel_from, rel_to):
rel_from = self.translate_client_path(rel_from)
rel_to = self.translate_client_path(rel_to)
self._backing_transport.move(rel_from, rel_to)
return request.SuccessfulSmartServerResponse(('ok',))
class PutRequest(VfsRequest):
def do(self, relpath, mode):
relpath = self.translate_client_path(relpath)
self._relpath = relpath
self._mode = _deserialise_optional_mode(mode)
def do_body(self, body_bytes):
self._backing_transport.put_bytes(self._relpath, body_bytes, self._mode)
return request.SuccessfulSmartServerResponse(('ok',))
class PutNonAtomicRequest(VfsRequest):
def do(self, relpath, mode, create_parent, dir_mode):
relpath = self.translate_client_path(relpath)
self._relpath = relpath
self._dir_mode = _deserialise_optional_mode(dir_mode)
self._mode = _deserialise_optional_mode(mode)
# a boolean would be nicer XXX
self._create_parent = (create_parent == 'T')
def do_body(self, body_bytes):
self._backing_transport.put_bytes_non_atomic(self._relpath,
body_bytes,
mode=self._mode,
create_parent_dir=self._create_parent,
dir_mode=self._dir_mode)
return request.SuccessfulSmartServerResponse(('ok',))
class ReadvRequest(VfsRequest):
def do(self, relpath):
relpath = self.translate_client_path(relpath)
self._relpath = relpath
def do_body(self, body_bytes):
"""accept offsets for a readv request."""
offsets = self._deserialise_offsets(body_bytes)
backing_bytes = ''.join(bytes for offset, bytes in
self._backing_transport.readv(self._relpath, offsets))
return request.SuccessfulSmartServerResponse(('readv',), backing_bytes)
def _deserialise_offsets(self, text):
# XXX: FIXME this should be on the protocol object.
offsets = []
for line in text.split('\n'):
if not line:
continue
start, length = line.split(',')
offsets.append((int(start), int(length)))
return offsets
class RenameRequest(VfsRequest):
def do(self, rel_from, rel_to):
rel_from = self.translate_client_path(rel_from)
rel_to = self.translate_client_path(rel_to)
self._backing_transport.rename(rel_from, rel_to)
return request.SuccessfulSmartServerResponse(('ok', ))
class RmdirRequest(VfsRequest):
def do(self, relpath):
relpath = self.translate_client_path(relpath)
self._backing_transport.rmdir(relpath)
return request.SuccessfulSmartServerResponse(('ok', ))
class StatRequest(VfsRequest):
def do(self, relpath):
if not relpath.endswith('/'):
relpath += '/'
relpath = self.translate_client_path(relpath)
stat = self._backing_transport.stat(relpath)
return request.SuccessfulSmartServerResponse(
('stat', str(stat.st_size), oct(stat.st_mode)))
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