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# Copyright (C) 2005 Robey Pointer <robey@lag.net>
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# Copyright (C) 2005, 2006, 2007 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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"""Implementation of Transport over SFTP, using paramiko."""
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# TODO: Remove the transport-based lock_read and lock_write methods. They'll
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# then raise TransportNotPossible, which will break remote access to any
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# formats which rely on OS-level locks. That should be fine as those formats
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# are pretty old, but these combinations may have to be removed from the test
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# suite. Those formats all date back to 0.7; so we should be able to remove
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# these methods when we officially drop support for those formats.
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from bzrlib.errors import (FileExists,
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NoSuchFile, PathNotChild,
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from bzrlib.osutils import pathjoin, fancy_rename, getcwd
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from bzrlib.symbol_versioning import (
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from bzrlib.trace import mutter, warning
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from bzrlib.transport import (
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# Disable one particular warning that comes from paramiko in Python2.5; if
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# this is emitted at the wrong time it tends to cause spurious test failures
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# or at least noise in the test case::
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# [1770/7639 in 86s, 1 known failures, 50 skipped, 2 missing features]
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# test_permissions.TestSftpPermissions.test_new_files
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# /var/lib/python-support/python2.5/paramiko/message.py:226: DeprecationWarning: integer argument expected, got float
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# self.packet.write(struct.pack('>I', n))
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warnings.filterwarnings('ignore',
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'integer argument expected, got float',
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category=DeprecationWarning,
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module='paramiko.message')
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except ImportError, e:
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raise ParamikoNotPresent(e)
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from paramiko.sftp import (SFTP_FLAG_WRITE, SFTP_FLAG_CREATE,
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SFTP_FLAG_EXCL, SFTP_FLAG_TRUNC,
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from paramiko.sftp_attr import SFTPAttributes
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from paramiko.sftp_file import SFTPFile
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_paramiko_version = getattr(paramiko, '__version_info__', (0, 0, 0))
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# don't use prefetch unless paramiko version >= 1.5.5 (there were bugs earlier)
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_default_do_prefetch = (_paramiko_version >= (1, 5, 5))
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@deprecated_function(zero_ninety)
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def clear_connection_cache():
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"""Remove all hosts from the SFTP connection cache.
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Primarily useful for test cases wanting to force garbage collection.
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We don't have a global connection cache anymore.
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class SFTPLock(object):
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"""This fakes a lock in a remote location.
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A present lock is indicated just by the existence of a file. This
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doesn't work well on all transports and they are only used in
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deprecated storage formats.
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__slots__ = ['path', 'lock_path', 'lock_file', 'transport']
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def __init__(self, path, transport):
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assert isinstance(transport, SFTPTransport)
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self.lock_file = None
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self.lock_path = path + '.write-lock'
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self.transport = transport
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# RBC 20060103 FIXME should we be using private methods here ?
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abspath = transport._remote_path(self.lock_path)
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self.lock_file = transport._sftp_open_exclusive(abspath)
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raise LockError('File %r already locked' % (self.path,))
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"""Should this warn, or actually try to cleanup?"""
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warning("SFTPLock %r not explicitly unlocked" % (self.path,))
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if not self.lock_file:
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self.lock_file.close()
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self.lock_file = None
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self.transport.delete(self.lock_path)
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except (NoSuchFile,):
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# What specific errors should we catch here?
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class SFTPTransport(ConnectedTransport):
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"""Transport implementation for SFTP access."""
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_do_prefetch = _default_do_prefetch
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# TODO: jam 20060717 Conceivably these could be configurable, either
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# by auto-tuning at run-time, or by a configuration (per host??)
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# but the performance curve is pretty flat, so just going with
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# reasonable defaults.
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_max_readv_combine = 200
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# Having to round trip to the server means waiting for a response,
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# so it is better to download extra bytes.
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# 8KiB had good performance for both local and remote network operations
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_bytes_to_read_before_seek = 8192
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# The sftp spec says that implementations SHOULD allow reads
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# to be at least 32K. paramiko.readv() does an async request
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# for the chunks. So we need to keep it within a single request
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# size for paramiko <= 1.6.1. paramiko 1.6.2 will probably chop
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# up the request itself, rather than us having to worry about it
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_max_request_size = 32768
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def __init__(self, base, _from_transport=None):
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assert base.startswith('sftp://')
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super(SFTPTransport, self).__init__(base,
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_from_transport=_from_transport)
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def _remote_path(self, relpath):
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"""Return the path to be passed along the sftp protocol for relpath.
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:param relpath: is a urlencoded string.
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relative = urlutils.unescape(relpath).encode('utf-8')
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remote_path = self._combine_paths(self._path, relative)
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# the initial slash should be removed from the path, and treated as a
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# homedir relative path (the path begins with a double slash if it is
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# absolute). see draft-ietf-secsh-scp-sftp-ssh-uri-03.txt
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# RBC 20060118 we are not using this as its too user hostile. instead
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# we are following lftp and using /~/foo to mean '~/foo'
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# vila--20070602 and leave absolute paths begin with a single slash.
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if remote_path.startswith('/~/'):
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remote_path = remote_path[3:]
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elif remote_path == '/~':
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def _create_connection(self, credentials=None):
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"""Create a new connection with the provided credentials.
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:param credentials: The credentials needed to establish the connection.
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:return: The created connection and its associated credentials.
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The credentials are only the password as it may have been entered
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interactively by the user and may be different from the one provided
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in base url at transport creation time.
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if credentials is None:
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password = self._password
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password = credentials
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vendor = ssh._get_ssh_vendor()
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connection = vendor.connect_sftp(self._user, password,
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self._host, self._port)
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return connection, password
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"""Ensures that a connection is established"""
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connection = self._get_connection()
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if connection is None:
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# First connection ever
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connection, credentials = self._create_connection()
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self._set_connection(connection, credentials)
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def has(self, relpath):
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Does the target location exist?
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self._get_sftp().stat(self._remote_path(relpath))
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def get(self, relpath):
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Get the file at the given relative path.
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:param relpath: The relative path to the file
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path = self._remote_path(relpath)
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f = self._get_sftp().file(path, mode='rb')
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if self._do_prefetch and (getattr(f, 'prefetch', None) is not None):
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except (IOError, paramiko.SSHException), e:
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self._translate_io_exception(e, path, ': error retrieving',
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failure_exc=errors.ReadError)
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def _readv(self, relpath, offsets):
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"""See Transport.readv()"""
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# We overload the default readv() because we want to use a file
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# that does not have prefetch enabled.
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# Also, if we have a new paramiko, it implements an async readv()
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path = self._remote_path(relpath)
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fp = self._get_sftp().file(path, mode='rb')
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readv = getattr(fp, 'readv', None)
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return self._sftp_readv(fp, offsets, relpath)
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mutter('seek and read %s offsets', len(offsets))
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return self._seek_and_read(fp, offsets, relpath)
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except (IOError, paramiko.SSHException), e:
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self._translate_io_exception(e, path, ': error retrieving')
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def recommended_page_size(self):
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"""See Transport.recommended_page_size().
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For SFTP we suggest a large page size to reduce the overhead
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introduced by latency.
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def _sftp_readv(self, fp, offsets, relpath='<unknown>'):
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"""Use the readv() member of fp to do async readv.
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And then read them using paramiko.readv(). paramiko.readv()
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does not support ranges > 64K, so it caps the request size, and
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just reads until it gets all the stuff it wants
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offsets = list(offsets)
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sorted_offsets = sorted(offsets)
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# The algorithm works as follows:
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# 1) Coalesce nearby reads into a single chunk
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# This generates a list of combined regions, the total size
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# and the size of the sub regions. This coalescing step is limited
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# in the number of nearby chunks to combine, and is allowed to
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# skip small breaks in the requests. Limiting it makes sure that
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# we can start yielding some data earlier, and skipping means we
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# make fewer requests. (Beneficial even when using async)
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# 2) Break up this combined regions into chunks that are smaller
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# than 64KiB. Technically the limit is 65536, but we are a
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# little bit conservative. This is because sftp has a maximum
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# return chunk size of 64KiB (max size of an unsigned short)
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# 3) Issue a readv() to paramiko to create an async request for
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# 4) Read in the data as it comes back, until we've read one
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# continuous section as determined in step 1
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# 5) Break up the full sections into hunks for the original requested
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# offsets. And put them in a cache
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# 6) Check if the next request is in the cache, and if it is, remove
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# it from the cache, and yield its data. Continue until no more
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# entries are in the cache.
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# 7) loop back to step 4 until all data has been read
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# TODO: jam 20060725 This could be optimized one step further, by
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# attempting to yield whatever data we have read, even before
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# the first coallesced section has been fully processed.
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# When coalescing for use with readv(), we don't really need to
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# use any fudge factor, because the requests are made asynchronously
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coalesced = list(self._coalesce_offsets(sorted_offsets,
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limit=self._max_readv_combine,
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for c_offset in coalesced:
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start = c_offset.start
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size = c_offset.length
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# We need to break this up into multiple requests
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next_size = min(size, self._max_request_size)
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requests.append((start, next_size))
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mutter('SFTP.readv() %s offsets => %s coalesced => %s requests',
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len(offsets), len(coalesced), len(requests))
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# Queue the current read until we have read the full coalesced section
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cur_coalesced_stack = iter(coalesced)
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cur_coalesced = cur_coalesced_stack.next()
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# Cache the results, but only until they have been fulfilled
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# turn the list of offsets into a stack
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offset_stack = iter(offsets)
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cur_offset_and_size = offset_stack.next()
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for data in fp.readv(requests):
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cur_data_len += len(data)
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if cur_data_len < cur_coalesced.length:
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assert cur_data_len == cur_coalesced.length, \
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"Somehow we read too much: %s != %s" % (cur_data_len,
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cur_coalesced.length)
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all_data = ''.join(cur_data)
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for suboffset, subsize in cur_coalesced.ranges:
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key = (cur_coalesced.start+suboffset, subsize)
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data_map[key] = all_data[suboffset:suboffset+subsize]
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# Now that we've read some data, see if we can yield anything back
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while cur_offset_and_size in data_map:
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this_data = data_map.pop(cur_offset_and_size)
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yield cur_offset_and_size[0], this_data
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cur_offset_and_size = offset_stack.next()
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# We read a coalesced entry, so mark it as done
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# Now that we've read all of the data for this coalesced section
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cur_coalesced = cur_coalesced_stack.next()
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if cur_coalesced is not None:
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raise errors.ShortReadvError(relpath, cur_coalesced.start,
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cur_coalesced.length, len(data))
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def put_file(self, relpath, f, mode=None):
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Copy the file-like object into the location.
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:param relpath: Location to put the contents, relative to base.
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:param f: File-like object.
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:param mode: The final mode for the file
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final_path = self._remote_path(relpath)
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return self._put(final_path, f, mode=mode)
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def _put(self, abspath, f, mode=None):
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"""Helper function so both put() and copy_abspaths can reuse the code"""
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tmp_abspath = '%s.tmp.%.9f.%d.%d' % (abspath, time.time(),
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os.getpid(), random.randint(0,0x7FFFFFFF))
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fout = self._sftp_open_exclusive(tmp_abspath, mode=mode)
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fout.set_pipelined(True)
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length = self._pump(f, fout)
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except (IOError, paramiko.SSHException), e:
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self._translate_io_exception(e, tmp_abspath)
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# XXX: This doesn't truly help like we would like it to.
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# The problem is that openssh strips sticky bits. So while we
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# can properly set group write permission, we lose the group
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# sticky bit. So it is probably best to stop chmodding, and
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# just tell users that they need to set the umask correctly.
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# The attr.st_mode = mode, in _sftp_open_exclusive
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# will handle when the user wants the final mode to be more
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# restrictive. And then we avoid a round trip. Unless
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# paramiko decides to expose an async chmod()
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# This is designed to chmod() right before we close.
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# Because we set_pipelined() earlier, theoretically we might
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# avoid the round trip for fout.close()
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self._get_sftp().chmod(tmp_abspath, mode)
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self._rename_and_overwrite(tmp_abspath, abspath)
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# If we fail, try to clean up the temporary file
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# before we throw the exception
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# but don't let another exception mess things up
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# Write out the traceback, because otherwise
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# the catch and throw destroys it
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mutter(traceback.format_exc())
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self._get_sftp().remove(tmp_abspath)
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# raise the saved except
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# raise the original with its traceback if we can.
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def _put_non_atomic_helper(self, relpath, writer, mode=None,
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create_parent_dir=False,
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abspath = self._remote_path(relpath)
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# TODO: jam 20060816 paramiko doesn't publicly expose a way to
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# set the file mode at create time. If it does, use it.
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# But for now, we just chmod later anyway.
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def _open_and_write_file():
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"""Try to open the target file, raise error on failure"""
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fout = self._get_sftp().file(abspath, mode='wb')
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fout.set_pipelined(True)
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except (paramiko.SSHException, IOError), e:
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self._translate_io_exception(e, abspath,
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# This is designed to chmod() right before we close.
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# Because we set_pipelined() earlier, theoretically we might
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# avoid the round trip for fout.close()
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self._get_sftp().chmod(abspath, mode)
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if not create_parent_dir:
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_open_and_write_file()
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# Try error handling to create the parent directory if we need to
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_open_and_write_file()
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# Try to create the parent directory, and then go back to
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parent_dir = os.path.dirname(abspath)
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self._mkdir(parent_dir, dir_mode)
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_open_and_write_file()
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def put_file_non_atomic(self, relpath, f, mode=None,
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create_parent_dir=False,
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"""Copy the file-like object into the target location.
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This function is not strictly safe to use. It is only meant to
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be used when you already know that the target does not exist.
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It is not safe, because it will open and truncate the remote
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file. So there may be a time when the file has invalid contents.
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:param relpath: The remote location to put the contents.
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:param f: File-like object.
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:param mode: Possible access permissions for new file.
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None means do not set remote permissions.
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:param create_parent_dir: If we cannot create the target file because
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the parent directory does not exist, go ahead and
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create it, and then try again.
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self._put_non_atomic_helper(relpath, writer, mode=mode,
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create_parent_dir=create_parent_dir,
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def put_bytes_non_atomic(self, relpath, bytes, mode=None,
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create_parent_dir=False,
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self._put_non_atomic_helper(relpath, writer, mode=mode,
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create_parent_dir=create_parent_dir,
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def iter_files_recursive(self):
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"""Walk the relative paths of all files in this transport."""
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queue = list(self.list_dir('.'))
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relpath = queue.pop(0)
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st = self.stat(relpath)
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if stat.S_ISDIR(st.st_mode):
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for i, basename in enumerate(self.list_dir(relpath)):
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queue.insert(i, relpath+'/'+basename)
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def _mkdir(self, abspath, mode=None):
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self._get_sftp().mkdir(abspath, local_mode)
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self._get_sftp().chmod(abspath, mode=mode)
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except (paramiko.SSHException, IOError), e:
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self._translate_io_exception(e, abspath, ': unable to mkdir',
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failure_exc=FileExists)
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def mkdir(self, relpath, mode=None):
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"""Create a directory at the given path."""
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self._mkdir(self._remote_path(relpath), mode=mode)
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def open_write_stream(self, relpath, mode=None):
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"""See Transport.open_write_stream."""
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# initialise the file to zero-length
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# this is three round trips, but we don't use this
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# api more than once per write_group at the moment so
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# it is a tolerable overhead. Better would be to truncate
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# the file after opening. RBC 20070805
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self.put_bytes_non_atomic(relpath, "", mode)
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abspath = self._remote_path(relpath)
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# TODO: jam 20060816 paramiko doesn't publicly expose a way to
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# set the file mode at create time. If it does, use it.
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# But for now, we just chmod later anyway.
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handle = self._get_sftp().file(abspath, mode='wb')
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handle.set_pipelined(True)
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except (paramiko.SSHException, IOError), e:
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self._translate_io_exception(e, abspath,
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_file_streams[self.abspath(relpath)] = handle
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return FileFileStream(self, relpath, handle)
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def _translate_io_exception(self, e, path, more_info='',
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failure_exc=PathError):
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"""Translate a paramiko or IOError into a friendlier exception.
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:param e: The original exception
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:param path: The path in question when the error is raised
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:param more_info: Extra information that can be included,
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such as what was going on
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:param failure_exc: Paramiko has the super fun ability to raise completely
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opaque errors that just set "e.args = ('Failure',)" with
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If this parameter is set, it defines the exception
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to raise in these cases.
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# paramiko seems to generate detailless errors.
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self._translate_error(e, path, raise_generic=False)
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if getattr(e, 'args', None) is not None:
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if (e.args == ('No such file or directory',) or
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e.args == ('No such file',)):
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raise NoSuchFile(path, str(e) + more_info)
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if (e.args == ('mkdir failed',)):
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raise FileExists(path, str(e) + more_info)
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# strange but true, for the paramiko server.
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if (e.args == ('Failure',)):
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raise failure_exc(path, str(e) + more_info)
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mutter('Raising exception with args %s', e.args)
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if getattr(e, 'errno', None) is not None:
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mutter('Raising exception with errno %s', e.errno)
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def append_file(self, relpath, f, mode=None):
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Append the text in the file-like object into the final
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path = self._remote_path(relpath)
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fout = self._get_sftp().file(path, 'ab')
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self._get_sftp().chmod(path, mode)
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except (IOError, paramiko.SSHException), e:
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self._translate_io_exception(e, relpath, ': unable to append')
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def rename(self, rel_from, rel_to):
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"""Rename without special overwriting"""
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self._get_sftp().rename(self._remote_path(rel_from),
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self._remote_path(rel_to))
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except (IOError, paramiko.SSHException), e:
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self._translate_io_exception(e, rel_from,
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': unable to rename to %r' % (rel_to))
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def _rename_and_overwrite(self, abs_from, abs_to):
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"""Do a fancy rename on the remote server.
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Using the implementation provided by osutils.
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sftp = self._get_sftp()
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fancy_rename(abs_from, abs_to,
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rename_func=sftp.rename,
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unlink_func=sftp.remove)
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except (IOError, paramiko.SSHException), e:
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self._translate_io_exception(e, abs_from,
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': unable to rename to %r' % (abs_to))
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def move(self, rel_from, rel_to):
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"""Move the item at rel_from to the location at rel_to"""
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path_from = self._remote_path(rel_from)
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path_to = self._remote_path(rel_to)
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self._rename_and_overwrite(path_from, path_to)
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def delete(self, relpath):
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"""Delete the item at relpath"""
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path = self._remote_path(relpath)
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self._get_sftp().remove(path)
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except (IOError, paramiko.SSHException), e:
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self._translate_io_exception(e, path, ': unable to delete')
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def external_url(self):
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"""See bzrlib.transport.Transport.external_url."""
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# the external path for SFTP is the base
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"""Return True if this store supports listing."""
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def list_dir(self, relpath):
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Return a list of all files at the given location.
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# does anything actually use this?
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# This is at least used by copy_tree for remote upgrades.
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# -- David Allouche 2006-08-11
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path = self._remote_path(relpath)
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entries = self._get_sftp().listdir(path)
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except (IOError, paramiko.SSHException), e:
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self._translate_io_exception(e, path, ': failed to list_dir')
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return [urlutils.escape(entry) for entry in entries]
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def rmdir(self, relpath):
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"""See Transport.rmdir."""
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path = self._remote_path(relpath)
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return self._get_sftp().rmdir(path)
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except (IOError, paramiko.SSHException), e:
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self._translate_io_exception(e, path, ': failed to rmdir')
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def stat(self, relpath):
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"""Return the stat information for a file."""
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path = self._remote_path(relpath)
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return self._get_sftp().stat(path)
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except (IOError, paramiko.SSHException), e:
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self._translate_io_exception(e, path, ': unable to stat')
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def lock_read(self, relpath):
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Lock the given file for shared (read) access.
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:return: A lock object, which has an unlock() member function
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# FIXME: there should be something clever i can do here...
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class BogusLock(object):
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def __init__(self, path):
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return BogusLock(relpath)
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def lock_write(self, relpath):
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Lock the given file for exclusive (write) access.
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WARNING: many transports do not support this, so trying avoid using it
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:return: A lock object, which has an unlock() member function
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# This is a little bit bogus, but basically, we create a file
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# which should not already exist, and if it does, we assume
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# that there is a lock, and if it doesn't, the we assume
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# that we have taken the lock.
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return SFTPLock(relpath, self)
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def _sftp_open_exclusive(self, abspath, mode=None):
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"""Open a remote path exclusively.
716
SFTP supports O_EXCL (SFTP_FLAG_EXCL), which fails if
717
the file already exists. However it does not expose this
718
at the higher level of SFTPClient.open(), so we have to
721
WARNING: This breaks the SFTPClient abstraction, so it
722
could easily break against an updated version of paramiko.
724
:param abspath: The remote absolute path where the file should be opened
725
:param mode: The mode permissions bits for the new file
727
# TODO: jam 20060816 Paramiko >= 1.6.2 (probably earlier) supports
728
# using the 'x' flag to indicate SFTP_FLAG_EXCL.
729
# However, there is no way to set the permission mode at open
730
# time using the sftp_client.file() functionality.
731
path = self._get_sftp()._adjust_cwd(abspath)
732
# mutter('sftp abspath %s => %s', abspath, path)
733
attr = SFTPAttributes()
736
omode = (SFTP_FLAG_WRITE | SFTP_FLAG_CREATE
737
| SFTP_FLAG_TRUNC | SFTP_FLAG_EXCL)
739
t, msg = self._get_sftp()._request(CMD_OPEN, path, omode, attr)
741
raise TransportError('Expected an SFTP handle')
742
handle = msg.get_string()
743
return SFTPFile(self._get_sftp(), handle, 'wb', -1)
744
except (paramiko.SSHException, IOError), e:
745
self._translate_io_exception(e, abspath, ': unable to open',
746
failure_exc=FileExists)
748
def _can_roundtrip_unix_modebits(self):
749
if sys.platform == 'win32':
755
# ------------- server test implementation --------------
758
from bzrlib.tests.stub_sftp import StubServer, StubSFTPServer
760
STUB_SERVER_KEY = """
761
-----BEGIN RSA PRIVATE KEY-----
762
MIICWgIBAAKBgQDTj1bqB4WmayWNPB+8jVSYpZYk80Ujvj680pOTh2bORBjbIAyz
763
oWGW+GUjzKxTiiPvVmxFgx5wdsFvF03v34lEVVhMpouqPAYQ15N37K/ir5XY+9m/
764
d8ufMCkjeXsQkKqFbAlQcnWMCRnOoPHS3I4vi6hmnDDeeYTSRvfLbW0fhwIBIwKB
765
gBIiOqZYaoqbeD9OS9z2K9KR2atlTxGxOJPXiP4ESqP3NVScWNwyZ3NXHpyrJLa0
766
EbVtzsQhLn6rF+TzXnOlcipFvjsem3iYzCpuChfGQ6SovTcOjHV9z+hnpXvQ/fon
767
soVRZY65wKnF7IAoUwTmJS9opqgrN6kRgCd3DASAMd1bAkEA96SBVWFt/fJBNJ9H
768
tYnBKZGw0VeHOYmVYbvMSstssn8un+pQpUm9vlG/bp7Oxd/m+b9KWEh2xPfv6zqU
769
avNwHwJBANqzGZa/EpzF4J8pGti7oIAPUIDGMtfIcmqNXVMckrmzQ2vTfqtkEZsA
770
4rE1IERRyiJQx6EJsz21wJmGV9WJQ5kCQQDwkS0uXqVdFzgHO6S++tjmjYcxwr3g
771
H0CoFYSgbddOT6miqRskOQF3DZVkJT3kyuBgU2zKygz52ukQZMqxCb1fAkASvuTv
772
qfpH87Qq5kQhNKdbbwbmd2NxlNabazPijWuphGTdW0VfJdWfklyS2Kr+iqrs/5wV
773
HhathJt636Eg7oIjAkA8ht3MQ+XSl9yIJIS8gVpbPxSw5OMfw0PjVE7tBdQruiSc
774
nvuQES5C9BMHjF39LZiGH1iLQy7FgdHyoP+eodI7
775
-----END RSA PRIVATE KEY-----
779
class SocketListener(threading.Thread):
781
def __init__(self, callback):
782
threading.Thread.__init__(self)
783
self._callback = callback
784
self._socket = socket.socket()
785
self._socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
786
self._socket.bind(('localhost', 0))
787
self._socket.listen(1)
788
self.port = self._socket.getsockname()[1]
789
self._stop_event = threading.Event()
792
# called from outside this thread
793
self._stop_event.set()
794
# use a timeout here, because if the test fails, the server thread may
795
# never notice the stop_event.
801
readable, writable_unused, exception_unused = \
802
select.select([self._socket], [], [], 0.1)
803
if self._stop_event.isSet():
805
if len(readable) == 0:
808
s, addr_unused = self._socket.accept()
809
# because the loopback socket is inline, and transports are
810
# never explicitly closed, best to launch a new thread.
811
threading.Thread(target=self._callback, args=(s,)).start()
812
except socket.error, x:
813
sys.excepthook(*sys.exc_info())
814
warning('Socket error during accept() within unit test server'
817
# probably a failed test; unit test thread will log the
819
sys.excepthook(*sys.exc_info())
820
warning('Exception from within unit test server thread: %r' %
824
class SocketDelay(object):
825
"""A socket decorator to make TCP appear slower.
827
This changes recv, send, and sendall to add a fixed latency to each python
828
call if a new roundtrip is detected. That is, when a recv is called and the
829
flag new_roundtrip is set, latency is charged. Every send and send_all
832
In addition every send, sendall and recv sleeps a bit per character send to
835
Not all methods are implemented, this is deliberate as this class is not a
836
replacement for the builtin sockets layer. fileno is not implemented to
837
prevent the proxy being bypassed.
841
_proxied_arguments = dict.fromkeys([
842
"close", "getpeername", "getsockname", "getsockopt", "gettimeout",
843
"setblocking", "setsockopt", "settimeout", "shutdown"])
845
def __init__(self, sock, latency, bandwidth=1.0,
848
:param bandwith: simulated bandwith (MegaBit)
849
:param really_sleep: If set to false, the SocketDelay will just
850
increase a counter, instead of calling time.sleep. This is useful for
851
unittesting the SocketDelay.
854
self.latency = latency
855
self.really_sleep = really_sleep
856
self.time_per_byte = 1 / (bandwidth / 8.0 * 1024 * 1024)
857
self.new_roundtrip = False
860
if self.really_sleep:
863
SocketDelay.simulated_time += s
865
def __getattr__(self, attr):
866
if attr in SocketDelay._proxied_arguments:
867
return getattr(self.sock, attr)
868
raise AttributeError("'SocketDelay' object has no attribute %r" %
872
return SocketDelay(self.sock.dup(), self.latency, self.time_per_byte,
875
def recv(self, *args):
876
data = self.sock.recv(*args)
877
if data and self.new_roundtrip:
878
self.new_roundtrip = False
879
self.sleep(self.latency)
880
self.sleep(len(data) * self.time_per_byte)
883
def sendall(self, data, flags=0):
884
if not self.new_roundtrip:
885
self.new_roundtrip = True
886
self.sleep(self.latency)
887
self.sleep(len(data) * self.time_per_byte)
888
return self.sock.sendall(data, flags)
890
def send(self, data, flags=0):
891
if not self.new_roundtrip:
892
self.new_roundtrip = True
893
self.sleep(self.latency)
894
bytes_sent = self.sock.send(data, flags)
895
self.sleep(bytes_sent * self.time_per_byte)
899
class SFTPServer(Server):
900
"""Common code for SFTP server facilities."""
902
def __init__(self, server_interface=StubServer):
903
self._original_vendor = None
905
self._server_homedir = None
906
self._listener = None
908
self._vendor = ssh.ParamikoVendor()
909
self._server_interface = server_interface
914
def _get_sftp_url(self, path):
915
"""Calculate an sftp url to this server for path."""
916
return 'sftp://foo:bar@localhost:%d/%s' % (self._listener.port, path)
918
def log(self, message):
919
"""StubServer uses this to log when a new server is created."""
920
self.logs.append(message)
922
def _run_server_entry(self, sock):
923
"""Entry point for all implementations of _run_server.
925
If self.add_latency is > 0.000001 then sock is given a latency adding
928
if self.add_latency > 0.000001:
929
sock = SocketDelay(sock, self.add_latency)
930
return self._run_server(sock)
932
def _run_server(self, s):
933
ssh_server = paramiko.Transport(s)
934
key_file = pathjoin(self._homedir, 'test_rsa.key')
935
f = open(key_file, 'w')
936
f.write(STUB_SERVER_KEY)
938
host_key = paramiko.RSAKey.from_private_key_file(key_file)
939
ssh_server.add_server_key(host_key)
940
server = self._server_interface(self)
941
ssh_server.set_subsystem_handler('sftp', paramiko.SFTPServer,
942
StubSFTPServer, root=self._root,
943
home=self._server_homedir)
944
event = threading.Event()
945
ssh_server.start_server(event, server)
948
def setUp(self, backing_server=None):
949
# XXX: TODO: make sftpserver back onto backing_server rather than local
951
assert (backing_server is None or
952
isinstance(backing_server, local.LocalURLServer)), (
953
"backing_server should not be %r, because this can only serve the "
954
"local current working directory." % (backing_server,))
955
self._original_vendor = ssh._ssh_vendor_manager._cached_ssh_vendor
956
ssh._ssh_vendor_manager._cached_ssh_vendor = self._vendor
957
if sys.platform == 'win32':
958
# Win32 needs to use the UNICODE api
959
self._homedir = getcwd()
961
# But Linux SFTP servers should just deal in bytestreams
962
self._homedir = os.getcwd()
963
if self._server_homedir is None:
964
self._server_homedir = self._homedir
966
if sys.platform == 'win32':
968
self._listener = SocketListener(self._run_server_entry)
969
self._listener.setDaemon(True)
970
self._listener.start()
973
"""See bzrlib.transport.Server.tearDown."""
974
self._listener.stop()
975
ssh._ssh_vendor_manager._cached_ssh_vendor = self._original_vendor
977
def get_bogus_url(self):
978
"""See bzrlib.transport.Server.get_bogus_url."""
979
# this is chosen to try to prevent trouble with proxies, wierd dns, etc
980
# we bind a random socket, so that we get a guaranteed unused port
981
# we just never listen on that port
983
s.bind(('localhost', 0))
984
return 'sftp://%s:%s/' % s.getsockname()
987
class SFTPFullAbsoluteServer(SFTPServer):
988
"""A test server for sftp transports, using absolute urls and ssh."""
991
"""See bzrlib.transport.Server.get_url."""
992
homedir = self._homedir
993
if sys.platform != 'win32':
994
# Remove the initial '/' on all platforms but win32
995
homedir = homedir[1:]
996
return self._get_sftp_url(urlutils.escape(homedir))
999
class SFTPServerWithoutSSH(SFTPServer):
1000
"""An SFTP server that uses a simple TCP socket pair rather than SSH."""
1003
super(SFTPServerWithoutSSH, self).__init__()
1004
self._vendor = ssh.LoopbackVendor()
1006
def _run_server(self, sock):
1007
# Re-import these as locals, so that they're still accessible during
1008
# interpreter shutdown (when all module globals get set to None, leading
1009
# to confusing errors like "'NoneType' object has no attribute 'error'".
1010
class FakeChannel(object):
1011
def get_transport(self):
1013
def get_log_channel(self):
1017
def get_hexdump(self):
1022
server = paramiko.SFTPServer(FakeChannel(), 'sftp', StubServer(self), StubSFTPServer,
1023
root=self._root, home=self._server_homedir)
1025
server.start_subsystem('sftp', None, sock)
1026
except socket.error, e:
1027
if (len(e.args) > 0) and (e.args[0] == errno.EPIPE):
1028
# it's okay for the client to disconnect abruptly
1029
# (bug in paramiko 1.6: it should absorb this exception)
1033
except Exception, e:
1034
# This typically seems to happen during interpreter shutdown, so
1035
# most of the useful ways to report this error are won't work.
1036
# Writing the exception type, and then the text of the exception,
1037
# seems to be the best we can do.
1039
sys.stderr.write('\nEXCEPTION %r: ' % (e.__class__,))
1040
sys.stderr.write('%s\n\n' % (e,))
1041
server.finish_subsystem()
1044
class SFTPAbsoluteServer(SFTPServerWithoutSSH):
1045
"""A test server for sftp transports, using absolute urls."""
1048
"""See bzrlib.transport.Server.get_url."""
1049
homedir = self._homedir
1050
if sys.platform != 'win32':
1051
# Remove the initial '/' on all platforms but win32
1052
homedir = homedir[1:]
1053
return self._get_sftp_url(urlutils.escape(homedir))
1056
class SFTPHomeDirServer(SFTPServerWithoutSSH):
1057
"""A test server for sftp transports, using homedir relative urls."""
1060
"""See bzrlib.transport.Server.get_url."""
1061
return self._get_sftp_url("~/")
1064
class SFTPSiblingAbsoluteServer(SFTPAbsoluteServer):
1065
"""A test server for sftp transports where only absolute paths will work.
1067
It does this by serving from a deeply-nested directory that doesn't exist.
1070
def setUp(self, backing_server=None):
1071
self._server_homedir = '/dev/noone/runs/tests/here'
1072
super(SFTPSiblingAbsoluteServer, self).setUp(backing_server)
1075
def get_test_permutations():
1076
"""Return the permutations to be used in testing."""
1077
return [(SFTPTransport, SFTPAbsoluteServer),
1078
(SFTPTransport, SFTPHomeDirServer),
1079
(SFTPTransport, SFTPSiblingAbsoluteServer),
added
removed
bzrlib/transport/sftp.py
