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# Copyright (C) 2005 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Implementation of Transport that uses memory for its storage."""
from copy import copy
import os
import errno
from stat import *
from cStringIO import StringIO
from bzrlib.trace import mutter
from bzrlib.errors import TransportError, NoSuchFile, FileExists
from bzrlib.transport import Transport, register_transport, Server
class MemoryStat(object):
def __init__(self, size, is_dir, perms):
self.st_size = size
if perms is None:
perms = 0644
if not is_dir:
self.st_mode = S_IFREG | perms
else:
self.st_mode = S_IFDIR | perms
class MemoryTransport(Transport):
"""This is the transport agent for local filesystem access."""
def __init__(self, url=""):
"""Set the 'base' path where files will be stored."""
if url == "":
url = "memory:/"
if url[-1] != '/':
url = url + '/'
super(MemoryTransport, self).__init__(url)
self._cwd = url[url.find(':') + 1:]
self._dirs = {}
self._files = {}
def clone(self, offset=None):
"""See Transport.clone()."""
if offset is None:
return copy(self)
segments = offset.split('/')
cwdsegments = self._cwd.split('/')[:-1]
while len(segments):
segment = segments.pop(0)
if segment == '.':
continue
if segment == '..':
if len(cwdsegments) > 1:
cwdsegments.pop()
continue
cwdsegments.append(segment)
url = self.base[:self.base.find(':') + 1] + '/'.join(cwdsegments) + '/'
result = MemoryTransport(url)
result._dirs = self._dirs
result._files = self._files
return result
def abspath(self, relpath):
"""See Transport.abspath()."""
return self.base[:-1] + self._abspath(relpath)
def append(self, relpath, f):
"""See Transport.append()."""
_abspath = self._abspath(relpath)
self._check_parent(_abspath)
orig_content, orig_mode = self._files.get(_abspath, ("", None))
self._files[_abspath] = (orig_content + f.read(), orig_mode)
def _check_parent(self, _abspath):
dir = os.path.dirname(_abspath)
if dir != '/':
if not dir in self._dirs:
raise NoSuchFile(_abspath)
def has(self, relpath):
"""See Transport.has()."""
_abspath = self._abspath(relpath)
return _abspath in self._files or _abspath in self._dirs
def delete(self, relpath):
"""See Transport.delete()."""
_abspath = self._abspath(relpath)
if not _abspath in self._files:
raise NoSuchFile(relpath)
del self._files[_abspath]
def get(self, relpath):
"""See Transport.get()."""
_abspath = self._abspath(relpath)
if not _abspath in self._files:
raise NoSuchFile(relpath)
return StringIO(self._files[_abspath][0])
def put(self, relpath, f, mode=None):
"""See Transport.put()."""
_abspath = self._abspath(relpath)
self._check_parent(_abspath)
self._files[_abspath] = (f.read(), mode)
def mkdir(self, relpath, mode=None):
"""See Transport.mkdir()."""
_abspath = self._abspath(relpath)
self._check_parent(_abspath)
if _abspath in self._dirs:
raise FileExists(relpath)
self._dirs[_abspath]=mode
def listable(self):
"""See Transport.listable."""
return True
def iter_files_recursive(self):
for file in self._files:
if file.startswith(self._cwd):
yield file[len(self._cwd):]
def list_dir(self, relpath):
"""See Transport.list_dir()."""
_abspath = self._abspath(relpath)
if _abspath != '/' and _abspath not in self._dirs:
raise NoSuchFile(relpath)
result = []
for path in self._files:
if (path.startswith(_abspath) and
path[len(_abspath) + 1:].find('/') == -1 and
len(path) > len(_abspath)):
result.append(path[len(_abspath) + 1:])
for path in self._dirs:
if (path.startswith(_abspath) and
path[len(_abspath) + 1:].find('/') == -1 and
len(path) > len(_abspath)):
result.append(path[len(_abspath) + 1:])
return result
def stat(self, relpath):
"""See Transport.stat()."""
_abspath = self._abspath(relpath)
if _abspath in self._files:
return MemoryStat(len(self._files[_abspath][0]), False,
self._files[_abspath][1])
elif _abspath == '':
return MemoryStat(0, True, None)
elif _abspath in self._dirs:
return MemoryStat(0, True, self._dirs[_abspath])
else:
raise NoSuchFile(relpath)
# def lock_read(self, relpath):
# TODO if needed
#
# def lock_write(self, relpath):
# TODO if needed
def _abspath(self, relpath):
"""Generate an internal absolute path."""
if relpath.find('..') != -1:
raise AssertionError('relpath contains ..')
if relpath == '.':
return self._cwd[:-1]
if relpath.endswith('/'):
relpath = relpath[:-1]
return self._cwd + relpath
class MemoryServer(Server):
"""Server for the MemoryTransport for testing with."""
def setUp(self):
"""See bzrlib.transport.Server.setUp."""
self._scheme = "memory+%s:" % id(self)
register_transport(self._scheme, MemoryTransport)
def tearDown(self):
"""See bzrlib.transport.Server.tearDown."""
# unregister this server
def get_url(self):
"""See bzrlib.transport.Server.get_url."""
return self._scheme
def get_test_permutations():
"""Return the permutations to be used in testing."""
return [(MemoryTransport, MemoryServer),
]
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