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# Copyright (C) 2006 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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"""Smart-server protocol, client and server.
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Requests are sent as a command and list of arguments, followed by optional
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bulk body data. Responses are similarly a response and list of arguments,
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followed by bulk body data. ::
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Fields are separated by Ctrl-A.
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BULK_DATA := CHUNK TRAILER
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Chunks can be repeated as many times as necessary.
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CHUNK := CHUNK_LEN CHUNK_BODY
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CHUNK_LEN := DIGIT+ NEWLINE
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Gives the number of bytes in the following chunk.
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CHUNK_BODY := BYTE[chunk_len]
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TRAILER := SUCCESS_TRAILER | ERROR_TRAILER
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SUCCESS_TRAILER := 'done' NEWLINE
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Paths are passed across the network. The client needs to see a namespace that
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includes any repository that might need to be referenced, and the client needs
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to know about a root directory beyond which it cannot ascend.
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Servers run over ssh will typically want to be able to access any path the user
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can access. Public servers on the other hand (which might be over http, ssh
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or tcp) will typically want to restrict access to only a particular directory
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and its children, so will want to do a software virtual root at that level.
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In other words they'll want to rewrite incoming paths to be under that level
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(and prevent escaping using ../ tricks.)
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URLs that include ~ should probably be passed across to the server verbatim
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and the server can expand them. This will proably not be meaningful when
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limited to a directory?
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At the bottom level socket, pipes, HTTP server. For sockets, we have the idea
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that you have multiple requests and get a read error because the other side did
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shutdown. For pipes we have read pipe which will have a zero read which marks
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end-of-file. For HTTP server environment there is not end-of-stream because
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each request coming into the server is independent.
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So we need a wrapper around pipes and sockets to seperate out requests from
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substrate and this will give us a single model which is consist for HTTP,
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MEDIUM (factory for protocol, reads bytes & pushes to protocol,
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uses protocol to detect end-of-request, sends written
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bytes to client) e.g. socket, pipe, HTTP request handler.
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PROTOCOL (serialization, deserialization) accepts bytes for one
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request, decodes according to internal state, pushes
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structured data to handler. accepts structured data from
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handler and encodes and writes to the medium. factory for
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HANDLER (domain logic) accepts structured data, operates state
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machine until the request can be satisfied,
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sends structured data to the protocol.
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CLIENT domain logic, accepts domain requests, generated structured
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data, reads structured data from responses and turns into
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domain data. Sends structured data to the protocol.
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Operates state machines until the request can be delivered
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(e.g. reading from a bundle generated in bzrlib to deliver a
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Possibly this should just be RemoteBzrDir, RemoteTransport,
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PROTOCOL (serialization, deserialization) accepts structured data for one
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request, encodes and writes to the medium. Reads bytes from the
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medium, decodes and allows the client to read structured data.
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MEDIUM (accepts bytes from the protocol & delivers to the remote server.
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Allows the potocol to read bytes e.g. socket, pipe, HTTP request.
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# TODO: _translate_error should be on the client, not the transport because
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# error coding is wire protocol specific.
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# TODO: A plain integer from query_version is too simple; should give some
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# TODO: Server should probably catch exceptions within itself and send them
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# back across the network. (But shouldn't catch KeyboardInterrupt etc)
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# Also needs to somehow report protocol errors like bad requests. Need to
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# consider how we'll handle error reporting, e.g. if we get halfway through a
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# bulk transfer and then something goes wrong.
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# TODO: Standard marker at start of request/response lines?
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# TODO: Make each request and response self-validatable, e.g. with checksums.
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# TODO: get/put objects could be changed to gradually read back the data as it
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# comes across the network
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# TODO: What should the server do if it hits an error and has to terminate?
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# TODO: is it useful to allow multiple chunks in the bulk data?
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# TODO: If we get an exception during transmission of bulk data we can't just
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# emit the exception because it won't be seen.
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# John proposes: I think it would be worthwhile to have a header on each
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# chunk, that indicates it is another chunk. Then you can send an 'error'
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# chunk as long as you finish the previous chunk.
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# TODO: Clone method on Transport; should work up towards parent directory;
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# unclear how this should be stored or communicated to the server... maybe
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# just pass it on all relevant requests?
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# TODO: Better name than clone() for changing between directories. How about
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# open_dir or change_dir or chdir?
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# TODO: Is it really good to have the notion of current directory within the
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# connection? Perhaps all Transports should factor out a common connection
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# from the thing that has the directory context?
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# TODO: Pull more things common to sftp and ssh to a higher level.
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# TODO: The server that manages a connection should be quite small and retain
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# minimum state because each of the requests are supposed to be stateless.
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# Then we can write another implementation that maps to http.
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# TODO: What to do when a client connection is garbage collected? Maybe just
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# abruptly drop the connection?
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# TODO: Server in some cases will need to restrict access to files outside of
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# a particular root directory. LocalTransport doesn't do anything to stop you
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# ascending above the base directory, so we need to prevent paths
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# containing '..' in either the server or transport layers. (Also need to
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# consider what happens if someone creates a symlink pointing outside the
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# TODO: Server should rebase absolute paths coming across the network to put
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# them under the virtual root, if one is in use. LocalTransport currently
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# doesn't do that; if you give it an absolute path it just uses it.
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# XXX: Arguments can't contain newlines or ascii; possibly we should e.g.
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# urlescape them instead. Indeed possibly this should just literally be
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# FIXME: This transport, with several others, has imperfect handling of paths
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# within urls. It'd probably be better for ".." from a root to raise an error
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# rather than return the same directory as we do at present.
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# TODO: Rather than working at the Transport layer we want a Branch,
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# Repository or BzrDir objects that talk to a server.
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# TODO: Probably want some way for server commands to gradually produce body
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# data rather than passing it as a string; they could perhaps pass an
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# iterator-like callback that will gradually yield data; it probably needs a
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# close() method that will always be closed to do any necessary cleanup.
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# TODO: Split the actual smart server from the ssh encoding of it.
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# TODO: Perhaps support file-level readwrite operations over the transport
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# TODO: SmartBzrDir class, proxying all Branch etc methods across to another
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# branch doing file-level operations.
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from cStringIO import StringIO
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from bzrlib.bundle.serializer import write_bundle
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from bzrlib.transport import ssh
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except errors.ParamikoNotPresent:
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# no paramiko. SmartSSHClientMedium will break.
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# must do this otherwise urllib can't parse the urls properly :(
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for scheme in ['ssh', 'bzr', 'bzr+loopback', 'bzr+ssh', 'bzr+http']:
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transport.register_urlparse_netloc_protocol(scheme)
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def _recv_tuple(from_file):
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req_line = from_file.readline()
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return _decode_tuple(req_line)
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def _decode_tuple(req_line):
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if req_line == None or req_line == '':
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if req_line[-1] != '\n':
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raise errors.SmartProtocolError("request %r not terminated" % req_line)
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return tuple(req_line[:-1].split('\x01'))
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def _encode_tuple(args):
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"""Encode the tuple args to a bytestream."""
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return '\x01'.join(args) + '\n'
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class SmartProtocolBase(object):
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"""Methods common to client and server"""
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# TODO: this only actually accomodates a single block; possibly should
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# support multiple chunks?
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def _encode_bulk_data(self, body):
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"""Encode body as a bulk data chunk."""
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return ''.join(('%d\n' % len(body), body, 'done\n'))
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def _serialise_offsets(self, offsets):
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"""Serialise a readv offset list."""
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for start, length in offsets:
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txt.append('%d,%d' % (start, length))
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return '\n'.join(txt)
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class SmartServerRequestProtocolOne(SmartProtocolBase):
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"""Server-side encoding and decoding logic for smart version 1."""
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def __init__(self, backing_transport, write_func):
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self._backing_transport = backing_transport
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self.excess_buffer = ''
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self._finished = False
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self.has_dispatched = False
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self._body_decoder = None
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self._write_func = write_func
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def accept_bytes(self, bytes):
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"""Take bytes, and advance the internal state machine appropriately.
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:param bytes: must be a byte string
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assert isinstance(bytes, str)
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self.in_buffer += bytes
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if not self.has_dispatched:
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if '\n' not in self.in_buffer:
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# no command line yet
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self.has_dispatched = True
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first_line, self.in_buffer = self.in_buffer.split('\n', 1)
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req_args = _decode_tuple(first_line)
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self.request = SmartServerRequestHandler(
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self._backing_transport)
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self.request.dispatch_command(req_args[0], req_args[1:])
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if self.request.finished_reading:
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self.excess_buffer = self.in_buffer
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self._send_response(self.request.response.args,
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self.request.response.body)
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except KeyboardInterrupt:
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except Exception, exception:
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# everything else: pass to client, flush, and quit
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self._send_response(('error', str(exception)))
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if self.has_dispatched:
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# nothing to do.XXX: this routine should be a single state
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self.excess_buffer += self.in_buffer
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if self._body_decoder is None:
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self._body_decoder = LengthPrefixedBodyDecoder()
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self._body_decoder.accept_bytes(self.in_buffer)
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self.in_buffer = self._body_decoder.unused_data
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body_data = self._body_decoder.read_pending_data()
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self.request.accept_body(body_data)
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if self._body_decoder.finished_reading:
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self.request.end_of_body()
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assert self.request.finished_reading, \
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"no more body, request not finished"
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if self.request.response is not None:
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self._send_response(self.request.response.args,
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self.request.response.body)
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self.excess_buffer = self.in_buffer
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assert not self.request.finished_reading, \
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"no response and we have finished reading."
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def _send_response(self, args, body=None):
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"""Send a smart server response down the output stream."""
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assert not self._finished, 'response already sent'
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self._finished = True
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self._write_func(_encode_tuple(args))
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assert isinstance(body, str), 'body must be a str'
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bytes = self._encode_bulk_data(body)
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self._write_func(bytes)
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def next_read_size(self):
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if self._body_decoder is None:
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return self._body_decoder.next_read_size()
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class LengthPrefixedBodyDecoder(object):
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"""Decodes the length-prefixed bulk data."""
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self.bytes_left = None
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self.finished_reading = False
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self.unused_data = ''
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self.state_accept = self._state_accept_expecting_length
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self.state_read = self._state_read_no_data
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self._trailer_buffer = ''
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def accept_bytes(self, bytes):
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"""Decode as much of bytes as possible.
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If 'bytes' contains too much data it will be appended to
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finished_reading will be set when no more data is required. Further
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data will be appended to self.unused_data.
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# accept_bytes is allowed to change the state
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current_state = self.state_accept
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self.state_accept(bytes)
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while current_state != self.state_accept:
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current_state = self.state_accept
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self.state_accept('')
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def next_read_size(self):
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if self.bytes_left is not None:
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# Ideally we want to read all the remainder of the body and the
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return self.bytes_left + 5
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elif self.state_accept == self._state_accept_reading_trailer:
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# Just the trailer left
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return 5 - len(self._trailer_buffer)
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elif self.state_accept == self._state_accept_expecting_length:
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# There's still at least 6 bytes left ('\n' to end the length, plus
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# Reading excess data. Either way, 1 byte at a time is fine.
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def read_pending_data(self):
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"""Return any pending data that has been decoded."""
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return self.state_read()
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def _state_accept_expecting_length(self, bytes):
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self._in_buffer += bytes
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pos = self._in_buffer.find('\n')
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self.bytes_left = int(self._in_buffer[:pos])
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self._in_buffer = self._in_buffer[pos+1:]
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self.bytes_left -= len(self._in_buffer)
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self.state_accept = self._state_accept_reading_body
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self.state_read = self._state_read_in_buffer
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def _state_accept_reading_body(self, bytes):
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self._in_buffer += bytes
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self.bytes_left -= len(bytes)
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if self.bytes_left <= 0:
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if self.bytes_left != 0:
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self._trailer_buffer = self._in_buffer[self.bytes_left:]
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self._in_buffer = self._in_buffer[:self.bytes_left]
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self.bytes_left = None
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self.state_accept = self._state_accept_reading_trailer
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def _state_accept_reading_trailer(self, bytes):
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self._trailer_buffer += bytes
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# TODO: what if the trailer does not match "done\n"? Should this raise
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# a ProtocolViolation exception?
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if self._trailer_buffer.startswith('done\n'):
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self.unused_data = self._trailer_buffer[len('done\n'):]
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self.state_accept = self._state_accept_reading_unused
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self.finished_reading = True
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def _state_accept_reading_unused(self, bytes):
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self.unused_data += bytes
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def _state_read_no_data(self):
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def _state_read_in_buffer(self):
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result = self._in_buffer
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class SmartServerStreamMedium(object):
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"""Handles smart commands coming over a stream.
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The stream may be a pipe connected to sshd, or a tcp socket, or an
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in-process fifo for testing.
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One instance is created for each connected client; it can serve multiple
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requests in the lifetime of the connection.
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The server passes requests through to an underlying backing transport,
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which will typically be a LocalTransport looking at the server's filesystem.
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def __init__(self, backing_transport):
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"""Construct new server.
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:param backing_transport: Transport for the directory served.
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# backing_transport could be passed to serve instead of __init__
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self.backing_transport = backing_transport
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self.finished = False
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"""Serve requests until the client disconnects."""
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# Keep a reference to stderr because the sys module's globals get set to
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# None during interpreter shutdown.
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from sys import stderr
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while not self.finished:
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protocol = SmartServerRequestProtocolOne(self.backing_transport,
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self._serve_one_request(protocol)
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stderr.write("%s terminating on exception %s\n" % (self, e))
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def _serve_one_request(self, protocol):
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"""Read one request from input, process, send back a response.
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:param protocol: a SmartServerRequestProtocol.
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self._serve_one_request_unguarded(protocol)
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except KeyboardInterrupt:
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self.terminate_due_to_error()
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def terminate_due_to_error(self):
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"""Called when an unhandled exception from the protocol occurs."""
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raise NotImplementedError(self.terminate_due_to_error)
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class SmartServerSocketStreamMedium(SmartServerStreamMedium):
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def __init__(self, sock, backing_transport):
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:param sock: the socket the server will read from. It will be put
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SmartServerStreamMedium.__init__(self, backing_transport)
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sock.setblocking(True)
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def _serve_one_request_unguarded(self, protocol):
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while protocol.next_read_size():
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protocol.accept_bytes(self.push_back)
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bytes = self.socket.recv(4096)
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protocol.accept_bytes(bytes)
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self.push_back = protocol.excess_buffer
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def terminate_due_to_error(self):
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"""Called when an unhandled exception from the protocol occurs."""
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# TODO: This should log to a server log file, but no such thing
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# exists yet. Andrew Bennetts 2006-09-29.
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def _write_out(self, bytes):
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self.socket.sendall(bytes)
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class SmartServerPipeStreamMedium(SmartServerStreamMedium):
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def __init__(self, in_file, out_file, backing_transport):
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"""Construct new server.
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:param in_file: Python file from which requests can be read.
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:param out_file: Python file to write responses.
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:param backing_transport: Transport for the directory served.
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SmartServerStreamMedium.__init__(self, backing_transport)
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def _serve_one_request_unguarded(self, protocol):
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bytes_to_read = protocol.next_read_size()
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if bytes_to_read == 0:
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# Finished serving this request.
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bytes = self._in.read(bytes_to_read)
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# Connection has been closed.
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protocol.accept_bytes(bytes)
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def terminate_due_to_error(self):
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# TODO: This should log to a server log file, but no such thing
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# exists yet. Andrew Bennetts 2006-09-29.
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def _write_out(self, bytes):
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self._out.write(bytes)
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class SmartServerResponse(object):
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"""Response generated by SmartServerRequestHandler."""
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def __init__(self, args, body=None):
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# XXX: TODO: Create a SmartServerRequestHandler which will take the responsibility
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# for delivering the data for a request. This could be done with as the
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# StreamServer, though that would create conflation between request and response
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# which may be undesirable.
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class SmartServerRequestHandler(object):
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"""Protocol logic for smart server.
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This doesn't handle serialization at all, it just processes requests and
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# IMPORTANT FOR IMPLEMENTORS: It is important that SmartServerRequestHandler
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# not contain encoding or decoding logic to allow the wire protocol to vary
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# from the object protocol: we will want to tweak the wire protocol separate
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# from the object model, and ideally we will be able to do that without
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# having a SmartServerRequestHandler subclass for each wire protocol, rather
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# just a Protocol subclass.
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# TODO: Better way of representing the body for commands that take it,
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# and allow it to be streamed into the server.
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def __init__(self, backing_transport):
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self._backing_transport = backing_transport
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self._converted_command = False
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self.finished_reading = False
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self._body_bytes = ''
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def accept_body(self, bytes):
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This should be overriden for each command that desired body data to
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handle the right format of that data. I.e. plain bytes, a bundle etc.
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The deserialisation into that format should be done in the Protocol
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object. Set self.desired_body_format to the format your method will
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# default fallback is to accumulate bytes.
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self._body_bytes += bytes
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def _end_of_body_handler(self):
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"""An unimplemented end of body handler."""
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raise NotImplementedError(self._end_of_body_handler)
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"""Answer a version request with my version."""
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return SmartServerResponse(('ok', '1'))
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def do_has(self, relpath):
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r = self._backing_transport.has(relpath) and 'yes' or 'no'
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return SmartServerResponse((r,))
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def do_get(self, relpath):
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backing_bytes = self._backing_transport.get_bytes(relpath)
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return SmartServerResponse(('ok',), backing_bytes)
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def _deserialise_optional_mode(self, mode):
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# XXX: FIXME this should be on the protocol object.
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def do_append(self, relpath, mode):
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self._converted_command = True
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self._relpath = relpath
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self._mode = self._deserialise_optional_mode(mode)
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self._end_of_body_handler = self._handle_do_append_end
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def _handle_do_append_end(self):
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old_length = self._backing_transport.append_bytes(
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self._relpath, self._body_bytes, self._mode)
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self.response = SmartServerResponse(('appended', '%d' % old_length))
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def do_delete(self, relpath):
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self._backing_transport.delete(relpath)
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def do_iter_files_recursive(self, relpath):
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transport = self._backing_transport.clone(relpath)
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filenames = transport.iter_files_recursive()
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return SmartServerResponse(('names',) + tuple(filenames))
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def do_list_dir(self, relpath):
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filenames = self._backing_transport.list_dir(relpath)
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return SmartServerResponse(('names',) + tuple(filenames))
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def do_mkdir(self, relpath, mode):
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self._backing_transport.mkdir(relpath,
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self._deserialise_optional_mode(mode))
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def do_move(self, rel_from, rel_to):
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self._backing_transport.move(rel_from, rel_to)
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def do_put(self, relpath, mode):
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self._converted_command = True
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self._relpath = relpath
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self._mode = self._deserialise_optional_mode(mode)
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self._end_of_body_handler = self._handle_do_put
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def _handle_do_put(self):
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self._backing_transport.put_bytes(self._relpath,
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self._body_bytes, self._mode)
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self.response = SmartServerResponse(('ok',))
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def _deserialise_offsets(self, text):
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# XXX: FIXME this should be on the protocol object.
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for line in text.split('\n'):
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start, length = line.split(',')
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offsets.append((int(start), int(length)))
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def do_put_non_atomic(self, relpath, mode, create_parent, dir_mode):
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self._converted_command = True
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self._end_of_body_handler = self._handle_put_non_atomic
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self._relpath = relpath
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self._dir_mode = self._deserialise_optional_mode(dir_mode)
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self._mode = self._deserialise_optional_mode(mode)
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# a boolean would be nicer XXX
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self._create_parent = (create_parent == 'T')
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def _handle_put_non_atomic(self):
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self._backing_transport.put_bytes_non_atomic(self._relpath,
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create_parent_dir=self._create_parent,
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dir_mode=self._dir_mode)
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self.response = SmartServerResponse(('ok',))
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def do_readv(self, relpath):
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self._converted_command = True
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self._end_of_body_handler = self._handle_readv_offsets
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self._relpath = relpath
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def end_of_body(self):
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"""No more body data will be received."""
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self._run_handler_code(self._end_of_body_handler, (), {})
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# cannot read after this.
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self.finished_reading = True
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def _handle_readv_offsets(self):
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"""accept offsets for a readv request."""
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offsets = self._deserialise_offsets(self._body_bytes)
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backing_bytes = ''.join(bytes for offset, bytes in
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self._backing_transport.readv(self._relpath, offsets))
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self.response = SmartServerResponse(('readv',), backing_bytes)
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def do_rename(self, rel_from, rel_to):
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self._backing_transport.rename(rel_from, rel_to)
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def do_rmdir(self, relpath):
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self._backing_transport.rmdir(relpath)
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def do_stat(self, relpath):
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stat = self._backing_transport.stat(relpath)
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return SmartServerResponse(('stat', str(stat.st_size), oct(stat.st_mode)))
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def do_get_bundle(self, path, revision_id):
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# open transport relative to our base
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t = self._backing_transport.clone(path)
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control, extra_path = bzrdir.BzrDir.open_containing_from_transport(t)
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repo = control.open_repository()
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tmpf = tempfile.TemporaryFile()
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base_revision = revision.NULL_REVISION
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write_bundle(repo, revision_id, base_revision, tmpf)
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return SmartServerResponse((), tmpf.read())
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def dispatch_command(self, cmd, args):
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"""Deprecated compatibility method.""" # XXX XXX
753
func = getattr(self, 'do_' + cmd, None)
755
raise errors.SmartProtocolError("bad request %r" % (cmd,))
756
self._run_handler_code(func, args, {})
758
def _run_handler_code(self, callable, args, kwargs):
759
"""Run some handler specific code 'callable'.
761
If a result is returned, it is considered to be the commands response,
762
and finished_reading is set true, and its assigned to self.response.
764
Any exceptions caught are translated and a response object created
767
result = self._call_converting_errors(callable, args, kwargs)
768
if result is not None:
769
self.response = result
770
self.finished_reading = True
771
# handle unconverted commands
772
if not self._converted_command:
773
self.finished_reading = True
775
self.response = SmartServerResponse(('ok',))
777
def _call_converting_errors(self, callable, args, kwargs):
778
"""Call callable converting errors to Response objects."""
780
return callable(*args, **kwargs)
781
except errors.NoSuchFile, e:
782
return SmartServerResponse(('NoSuchFile', e.path))
783
except errors.FileExists, e:
784
return SmartServerResponse(('FileExists', e.path))
785
except errors.DirectoryNotEmpty, e:
786
return SmartServerResponse(('DirectoryNotEmpty', e.path))
787
except errors.ShortReadvError, e:
788
return SmartServerResponse(('ShortReadvError',
789
e.path, str(e.offset), str(e.length), str(e.actual)))
790
except UnicodeError, e:
791
# If it is a DecodeError, than most likely we are starting
792
# with a plain string
793
str_or_unicode = e.object
794
if isinstance(str_or_unicode, unicode):
795
# XXX: UTF-8 might have \x01 (our seperator byte) in it. We
796
# should escape it somehow.
797
val = 'u:' + str_or_unicode.encode('utf-8')
799
val = 's:' + str_or_unicode.encode('base64')
800
# This handles UnicodeEncodeError or UnicodeDecodeError
801
return SmartServerResponse((e.__class__.__name__,
802
e.encoding, val, str(e.start), str(e.end), e.reason))
803
except errors.TransportNotPossible, e:
804
if e.msg == "readonly transport":
805
return SmartServerResponse(('ReadOnlyError', ))
810
class SmartTCPServer(object):
811
"""Listens on a TCP socket and accepts connections from smart clients"""
813
def __init__(self, backing_transport, host='127.0.0.1', port=0):
814
"""Construct a new server.
816
To actually start it running, call either start_background_thread or
819
:param host: Name of the interface to listen on.
820
:param port: TCP port to listen on, or 0 to allocate a transient port.
822
self._server_socket = socket.socket()
823
self._server_socket.bind((host, port))
824
self.port = self._server_socket.getsockname()[1]
825
self._server_socket.listen(1)
826
self._server_socket.settimeout(1)
827
self.backing_transport = backing_transport
830
# let connections timeout so that we get a chance to terminate
831
# Keep a reference to the exceptions we want to catch because the socket
832
# module's globals get set to None during interpreter shutdown.
833
from socket import timeout as socket_timeout
834
from socket import error as socket_error
835
self._should_terminate = False
836
while not self._should_terminate:
838
self.accept_and_serve()
839
except socket_timeout:
840
# just check if we're asked to stop
842
except socket_error, e:
843
trace.warning("client disconnected: %s", e)
847
"""Return the url of the server"""
848
return "bzr://%s:%d/" % self._server_socket.getsockname()
850
def accept_and_serve(self):
851
conn, client_addr = self._server_socket.accept()
852
# For WIN32, where the timeout value from the listening socket
853
# propogates to the newly accepted socket.
854
conn.setblocking(True)
855
conn.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
856
handler = SmartServerSocketStreamMedium(conn, self.backing_transport)
857
connection_thread = threading.Thread(None, handler.serve, name='smart-server-child')
858
connection_thread.setDaemon(True)
859
connection_thread.start()
861
def start_background_thread(self):
862
self._server_thread = threading.Thread(None,
864
name='server-' + self.get_url())
865
self._server_thread.setDaemon(True)
866
self._server_thread.start()
868
def stop_background_thread(self):
869
self._should_terminate = True
870
# self._server_socket.close()
871
# we used to join the thread, but it's not really necessary; it will
873
## self._server_thread.join()
876
class SmartTCPServer_for_testing(SmartTCPServer):
877
"""Server suitable for use by transport tests.
879
This server is backed by the process's cwd.
883
self._homedir = urlutils.local_path_to_url(os.getcwd())[7:]
884
# The server is set up by default like for ssh access: the client
885
# passes filesystem-absolute paths; therefore the server must look
886
# them up relative to the root directory. it might be better to act
887
# a public server and have the server rewrite paths into the test
889
SmartTCPServer.__init__(self,
890
transport.get_transport(urlutils.local_path_to_url('/')))
893
"""Set up server for testing"""
894
self.start_background_thread()
897
self.stop_background_thread()
900
"""Return the url of the server"""
901
host, port = self._server_socket.getsockname()
902
return "bzr://%s:%d%s" % (host, port, urlutils.escape(self._homedir))
904
def get_bogus_url(self):
905
"""Return a URL which will fail to connect"""
906
return 'bzr://127.0.0.1:1/'
909
class SmartStat(object):
911
def __init__(self, size, mode):
916
class SmartTransport(transport.Transport):
917
"""Connection to a smart server.
919
The connection holds references to pipes that can be used to send requests
922
The connection has a notion of the current directory to which it's
923
connected; this is incorporated in filenames passed to the server.
925
This supports some higher-level RPC operations and can also be treated
926
like a Transport to do file-like operations.
928
The connection can be made over a tcp socket, or (in future) an ssh pipe
929
or a series of http requests. There are concrete subclasses for each
930
type: SmartTCPTransport, etc.
933
# IMPORTANT FOR IMPLEMENTORS: SmartTransport MUST NOT be given encoding
934
# responsibilities: Put those on SmartClient or similar. This is vital for
935
# the ability to support multiple versions of the smart protocol over time:
936
# SmartTransport is an adapter from the Transport object model to the
937
# SmartClient model, not an encoder.
939
def __init__(self, url, clone_from=None, medium=None):
942
:param medium: The medium to use for this RemoteTransport. This must be
943
supplied if clone_from is None.
945
### Technically super() here is faulty because Transport's __init__
946
### fails to take 2 parameters, and if super were to choose a silly
947
### initialisation order things would blow up.
948
if not url.endswith('/'):
950
super(SmartTransport, self).__init__(url)
951
self._scheme, self._username, self._password, self._host, self._port, self._path = \
952
transport.split_url(url)
953
if clone_from is None:
954
self._medium = medium
956
# credentials may be stripped from the base in some circumstances
957
# as yet to be clearly defined or documented, so copy them.
958
self._username = clone_from._username
959
# reuse same connection
960
self._medium = clone_from._medium
961
assert self._medium is not None
963
def abspath(self, relpath):
964
"""Return the full url to the given relative path.
966
@param relpath: the relative path or path components
967
@type relpath: str or list
969
return self._unparse_url(self._remote_path(relpath))
971
def clone(self, relative_url):
972
"""Make a new SmartTransport related to me, sharing the same connection.
974
This essentially opens a handle on a different remote directory.
976
if relative_url is None:
977
return SmartTransport(self.base, self)
979
return SmartTransport(self.abspath(relative_url), self)
981
def is_readonly(self):
982
"""Smart server transport can do read/write file operations."""
985
def get_smart_client(self):
988
def get_smart_medium(self):
991
def _unparse_url(self, path):
992
"""Return URL for a path.
994
:see: SFTPUrlHandling._unparse_url
996
# TODO: Eventually it should be possible to unify this with
997
# SFTPUrlHandling._unparse_url?
1000
path = urllib.quote(path)
1001
netloc = urllib.quote(self._host)
1002
if self._username is not None:
1003
netloc = '%s@%s' % (urllib.quote(self._username), netloc)
1004
if self._port is not None:
1005
netloc = '%s:%d' % (netloc, self._port)
1006
return urlparse.urlunparse((self._scheme, netloc, path, '', '', ''))
1008
def _remote_path(self, relpath):
1009
"""Returns the Unicode version of the absolute path for relpath."""
1010
return self._combine_paths(self._path, relpath)
1012
def _call(self, method, *args):
1013
resp = self._call2(method, *args)
1014
self._translate_error(resp)
1016
def _call2(self, method, *args):
1017
"""Call a method on the remote server."""
1018
protocol = SmartClientRequestProtocolOne(self._medium.get_request())
1019
protocol.call(method, *args)
1020
return protocol.read_response_tuple()
1022
def _call_with_body_bytes(self, method, args, body):
1023
"""Call a method on the remote server with body bytes."""
1024
protocol = SmartClientRequestProtocolOne(self._medium.get_request())
1025
protocol.call_with_body_bytes((method, ) + args, body)
1026
return protocol.read_response_tuple()
1028
def has(self, relpath):
1029
"""Indicate whether a remote file of the given name exists or not.
1031
:see: Transport.has()
1033
resp = self._call2('has', self._remote_path(relpath))
1034
if resp == ('yes', ):
1036
elif resp == ('no', ):
1039
self._translate_error(resp)
1041
def get(self, relpath):
1042
"""Return file-like object reading the contents of a remote file.
1044
:see: Transport.get_bytes()/get_file()
1046
return StringIO(self.get_bytes(relpath))
1048
def get_bytes(self, relpath):
1049
remote = self._remote_path(relpath)
1050
protocol = SmartClientRequestProtocolOne(self._medium.get_request())
1051
protocol.call('get', remote)
1052
resp = protocol.read_response_tuple(True)
1053
if resp != ('ok', ):
1054
protocol.cancel_read_body()
1055
self._translate_error(resp, relpath)
1056
return protocol.read_body_bytes()
1058
def _serialise_optional_mode(self, mode):
1064
def mkdir(self, relpath, mode=None):
1065
resp = self._call2('mkdir', self._remote_path(relpath),
1066
self._serialise_optional_mode(mode))
1067
self._translate_error(resp)
1069
def put_bytes(self, relpath, upload_contents, mode=None):
1070
# FIXME: upload_file is probably not safe for non-ascii characters -
1071
# should probably just pass all parameters as length-delimited
1073
resp = self._call_with_body_bytes('put',
1074
(self._remote_path(relpath), self._serialise_optional_mode(mode)),
1076
self._translate_error(resp)
1078
def put_bytes_non_atomic(self, relpath, bytes, mode=None,
1079
create_parent_dir=False,
1081
"""See Transport.put_bytes_non_atomic."""
1082
# FIXME: no encoding in the transport!
1083
create_parent_str = 'F'
1084
if create_parent_dir:
1085
create_parent_str = 'T'
1087
resp = self._call_with_body_bytes(
1089
(self._remote_path(relpath), self._serialise_optional_mode(mode),
1090
create_parent_str, self._serialise_optional_mode(dir_mode)),
1092
self._translate_error(resp)
1094
def put_file(self, relpath, upload_file, mode=None):
1095
# its not ideal to seek back, but currently put_non_atomic_file depends
1096
# on transports not reading before failing - which is a faulty
1097
# assumption I think - RBC 20060915
1098
pos = upload_file.tell()
1100
return self.put_bytes(relpath, upload_file.read(), mode)
1102
upload_file.seek(pos)
1105
def put_file_non_atomic(self, relpath, f, mode=None,
1106
create_parent_dir=False,
1108
return self.put_bytes_non_atomic(relpath, f.read(), mode=mode,
1109
create_parent_dir=create_parent_dir,
1112
def append_file(self, relpath, from_file, mode=None):
1113
return self.append_bytes(relpath, from_file.read(), mode)
1115
def append_bytes(self, relpath, bytes, mode=None):
1116
resp = self._call_with_body_bytes(
1118
(self._remote_path(relpath), self._serialise_optional_mode(mode)),
1120
if resp[0] == 'appended':
1122
self._translate_error(resp)
1124
def delete(self, relpath):
1125
resp = self._call2('delete', self._remote_path(relpath))
1126
self._translate_error(resp)
1128
def readv(self, relpath, offsets):
1132
offsets = list(offsets)
1134
sorted_offsets = sorted(offsets)
1135
# turn the list of offsets into a stack
1136
offset_stack = iter(offsets)
1137
cur_offset_and_size = offset_stack.next()
1138
coalesced = list(self._coalesce_offsets(sorted_offsets,
1139
limit=self._max_readv_combine,
1140
fudge_factor=self._bytes_to_read_before_seek))
1142
protocol = SmartClientRequestProtocolOne(self._medium.get_request())
1143
protocol.call_with_body_readv_array(
1144
('readv', self._remote_path(relpath)),
1145
[(c.start, c.length) for c in coalesced])
1146
resp = protocol.read_response_tuple(True)
1148
if resp[0] != 'readv':
1149
# This should raise an exception
1150
protocol.cancel_read_body()
1151
self._translate_error(resp)
1154
# FIXME: this should know how many bytes are needed, for clarity.
1155
data = protocol.read_body_bytes()
1156
# Cache the results, but only until they have been fulfilled
1158
for c_offset in coalesced:
1159
if len(data) < c_offset.length:
1160
raise errors.ShortReadvError(relpath, c_offset.start,
1161
c_offset.length, actual=len(data))
1162
for suboffset, subsize in c_offset.ranges:
1163
key = (c_offset.start+suboffset, subsize)
1164
data_map[key] = data[suboffset:suboffset+subsize]
1165
data = data[c_offset.length:]
1167
# Now that we've read some data, see if we can yield anything back
1168
while cur_offset_and_size in data_map:
1169
this_data = data_map.pop(cur_offset_and_size)
1170
yield cur_offset_and_size[0], this_data
1171
cur_offset_and_size = offset_stack.next()
1173
def rename(self, rel_from, rel_to):
1174
self._call('rename',
1175
self._remote_path(rel_from),
1176
self._remote_path(rel_to))
1178
def move(self, rel_from, rel_to):
1180
self._remote_path(rel_from),
1181
self._remote_path(rel_to))
1183
def rmdir(self, relpath):
1184
resp = self._call('rmdir', self._remote_path(relpath))
1186
def _translate_error(self, resp, orig_path=None):
1187
"""Raise an exception from a response"""
1194
elif what == 'NoSuchFile':
1195
if orig_path is not None:
1196
error_path = orig_path
1198
error_path = resp[1]
1199
raise errors.NoSuchFile(error_path)
1200
elif what == 'error':
1201
raise errors.SmartProtocolError(unicode(resp[1]))
1202
elif what == 'FileExists':
1203
raise errors.FileExists(resp[1])
1204
elif what == 'DirectoryNotEmpty':
1205
raise errors.DirectoryNotEmpty(resp[1])
1206
elif what == 'ShortReadvError':
1207
raise errors.ShortReadvError(resp[1], int(resp[2]),
1208
int(resp[3]), int(resp[4]))
1209
elif what in ('UnicodeEncodeError', 'UnicodeDecodeError'):
1210
encoding = str(resp[1]) # encoding must always be a string
1212
start = int(resp[3])
1214
reason = str(resp[5]) # reason must always be a string
1215
if val.startswith('u:'):
1216
val = val[2:].decode('utf-8')
1217
elif val.startswith('s:'):
1218
val = val[2:].decode('base64')
1219
if what == 'UnicodeDecodeError':
1220
raise UnicodeDecodeError(encoding, val, start, end, reason)
1221
elif what == 'UnicodeEncodeError':
1222
raise UnicodeEncodeError(encoding, val, start, end, reason)
1223
elif what == "ReadOnlyError":
1224
raise errors.TransportNotPossible('readonly transport')
1226
raise errors.SmartProtocolError('unexpected smart server error: %r' % (resp,))
1228
def disconnect(self):
1229
self._medium.disconnect()
1231
def delete_tree(self, relpath):
1232
raise errors.TransportNotPossible('readonly transport')
1234
def stat(self, relpath):
1235
resp = self._call2('stat', self._remote_path(relpath))
1236
if resp[0] == 'stat':
1237
return SmartStat(int(resp[1]), int(resp[2], 8))
1239
self._translate_error(resp)
1241
## def lock_read(self, relpath):
1242
## """Lock the given file for shared (read) access.
1243
## :return: A lock object, which should be passed to Transport.unlock()
1245
## # The old RemoteBranch ignore lock for reading, so we will
1246
## # continue that tradition and return a bogus lock object.
1247
## class BogusLock(object):
1248
## def __init__(self, path):
1250
## def unlock(self):
1252
## return BogusLock(relpath)
1257
def list_dir(self, relpath):
1258
resp = self._call2('list_dir', self._remote_path(relpath))
1259
if resp[0] == 'names':
1260
return [name.encode('ascii') for name in resp[1:]]
1262
self._translate_error(resp)
1264
def iter_files_recursive(self):
1265
resp = self._call2('iter_files_recursive', self._remote_path(''))
1266
if resp[0] == 'names':
1269
self._translate_error(resp)
1272
class SmartClientMediumRequest(object):
1273
"""A request on a SmartClientMedium.
1275
Each request allows bytes to be provided to it via accept_bytes, and then
1276
the response bytes to be read via read_bytes.
1279
request.accept_bytes('123')
1280
request.finished_writing()
1281
result = request.read_bytes(3)
1282
request.finished_reading()
1284
It is up to the individual SmartClientMedium whether multiple concurrent
1285
requests can exist. See SmartClientMedium.get_request to obtain instances
1286
of SmartClientMediumRequest, and the concrete Medium you are using for
1287
details on concurrency and pipelining.
1290
def __init__(self, medium):
1291
"""Construct a SmartClientMediumRequest for the medium medium."""
1292
self._medium = medium
1293
# we track state by constants - we may want to use the same
1294
# pattern as BodyReader if it gets more complex.
1295
# valid states are: "writing", "reading", "done"
1296
self._state = "writing"
1298
def accept_bytes(self, bytes):
1299
"""Accept bytes for inclusion in this request.
1301
This method may not be be called after finished_writing() has been
1302
called. It depends upon the Medium whether or not the bytes will be
1303
immediately transmitted. Message based Mediums will tend to buffer the
1304
bytes until finished_writing() is called.
1306
:param bytes: A bytestring.
1308
if self._state != "writing":
1309
raise errors.WritingCompleted(self)
1310
self._accept_bytes(bytes)
1312
def _accept_bytes(self, bytes):
1313
"""Helper for accept_bytes.
1315
Accept_bytes checks the state of the request to determing if bytes
1316
should be accepted. After that it hands off to _accept_bytes to do the
1319
raise NotImplementedError(self._accept_bytes)
1321
def finished_reading(self):
1322
"""Inform the request that all desired data has been read.
1324
This will remove the request from the pipeline for its medium (if the
1325
medium supports pipelining) and any further calls to methods on the
1326
request will raise ReadingCompleted.
1328
if self._state == "writing":
1329
raise errors.WritingNotComplete(self)
1330
if self._state != "reading":
1331
raise errors.ReadingCompleted(self)
1332
self._state = "done"
1333
self._finished_reading()
1335
def _finished_reading(self):
1336
"""Helper for finished_reading.
1338
finished_reading checks the state of the request to determine if
1339
finished_reading is allowed, and if it is hands off to _finished_reading
1340
to perform the action.
1342
raise NotImplementedError(self._finished_reading)
1344
def finished_writing(self):
1345
"""Finish the writing phase of this request.
1347
This will flush all pending data for this request along the medium.
1348
After calling finished_writing, you may not call accept_bytes anymore.
1350
if self._state != "writing":
1351
raise errors.WritingCompleted(self)
1352
self._state = "reading"
1353
self._finished_writing()
1355
def _finished_writing(self):
1356
"""Helper for finished_writing.
1358
finished_writing checks the state of the request to determine if
1359
finished_writing is allowed, and if it is hands off to _finished_writing
1360
to perform the action.
1362
raise NotImplementedError(self._finished_writing)
1364
def read_bytes(self, count):
1365
"""Read bytes from this requests response.
1367
This method will block and wait for count bytes to be read. It may not
1368
be invoked until finished_writing() has been called - this is to ensure
1369
a message-based approach to requests, for compatability with message
1370
based mediums like HTTP.
1372
if self._state == "writing":
1373
raise errors.WritingNotComplete(self)
1374
if self._state != "reading":
1375
raise errors.ReadingCompleted(self)
1376
return self._read_bytes(count)
1378
def _read_bytes(self, count):
1379
"""Helper for read_bytes.
1381
read_bytes checks the state of the request to determing if bytes
1382
should be read. After that it hands off to _read_bytes to do the
1385
raise NotImplementedError(self._read_bytes)
1388
class SmartClientStreamMediumRequest(SmartClientMediumRequest):
1389
"""A SmartClientMediumRequest that works with an SmartClientStreamMedium."""
1391
def __init__(self, medium):
1392
SmartClientMediumRequest.__init__(self, medium)
1393
# check that we are safe concurrency wise. If some streams start
1394
# allowing concurrent requests - i.e. via multiplexing - then this
1395
# assert should be moved to SmartClientStreamMedium.get_request,
1396
# and the setting/unsetting of _current_request likewise moved into
1397
# that class : but its unneeded overhead for now. RBC 20060922
1398
if self._medium._current_request is not None:
1399
raise errors.TooManyConcurrentRequests(self._medium)
1400
self._medium._current_request = self
1402
def _accept_bytes(self, bytes):
1403
"""See SmartClientMediumRequest._accept_bytes.
1405
This forwards to self._medium._accept_bytes because we are operating
1406
on the mediums stream.
1408
self._medium._accept_bytes(bytes)
1410
def _finished_reading(self):
1411
"""See SmartClientMediumRequest._finished_reading.
1413
This clears the _current_request on self._medium to allow a new
1414
request to be created.
1416
assert self._medium._current_request is self
1417
self._medium._current_request = None
1419
def _finished_writing(self):
1420
"""See SmartClientMediumRequest._finished_writing.
1422
This invokes self._medium._flush to ensure all bytes are transmitted.
1424
self._medium._flush()
1426
def _read_bytes(self, count):
1427
"""See SmartClientMediumRequest._read_bytes.
1429
This forwards to self._medium._read_bytes because we are operating
1430
on the mediums stream.
1432
return self._medium._read_bytes(count)
1435
class SmartClientRequestProtocolOne(SmartProtocolBase):
1436
"""The client-side protocol for smart version 1."""
1438
def __init__(self, request):
1439
"""Construct a SmartClientRequestProtocolOne.
1441
:param request: A SmartClientMediumRequest to serialise onto and
1444
self._request = request
1445
self._body_buffer = None
1447
def call(self, *args):
1448
bytes = _encode_tuple(args)
1449
self._request.accept_bytes(bytes)
1450
self._request.finished_writing()
1452
def call_with_body_bytes(self, args, body):
1453
"""Make a remote call of args with body bytes 'body'.
1455
After calling this, call read_response_tuple to find the result out.
1457
bytes = _encode_tuple(args)
1458
self._request.accept_bytes(bytes)
1459
bytes = self._encode_bulk_data(body)
1460
self._request.accept_bytes(bytes)
1461
self._request.finished_writing()
1463
def call_with_body_readv_array(self, args, body):
1464
"""Make a remote call with a readv array.
1466
The body is encoded with one line per readv offset pair. The numbers in
1467
each pair are separated by a comma, and no trailing \n is emitted.
1469
bytes = _encode_tuple(args)
1470
self._request.accept_bytes(bytes)
1471
readv_bytes = self._serialise_offsets(body)
1472
bytes = self._encode_bulk_data(readv_bytes)
1473
self._request.accept_bytes(bytes)
1474
self._request.finished_writing()
1476
def cancel_read_body(self):
1477
"""After expecting a body, a response code may indicate one otherwise.
1479
This method lets the domain client inform the protocol that no body
1480
will be transmitted. This is a terminal method: after calling it the
1481
protocol is not able to be used further.
1483
self._request.finished_reading()
1485
def read_response_tuple(self, expect_body=False):
1486
"""Read a response tuple from the wire.
1488
This should only be called once.
1490
result = self._recv_tuple()
1492
self._request.finished_reading()
1495
def read_body_bytes(self, count=-1):
1496
"""Read bytes from the body, decoding into a byte stream.
1498
We read all bytes at once to ensure we've checked the trailer for
1499
errors, and then feed the buffer back as read_body_bytes is called.
1501
if self._body_buffer is not None:
1502
return self._body_buffer.read(count)
1503
_body_decoder = LengthPrefixedBodyDecoder()
1505
while not _body_decoder.finished_reading:
1506
bytes_wanted = _body_decoder.next_read_size()
1507
bytes = self._request.read_bytes(bytes_wanted)
1508
_body_decoder.accept_bytes(bytes)
1509
self._request.finished_reading()
1510
self._body_buffer = StringIO(_body_decoder.read_pending_data())
1511
# XXX: TODO check the trailer result.
1512
return self._body_buffer.read(count)
1514
def _recv_tuple(self):
1515
"""Receive a tuple from the medium request."""
1517
while not line or line[-1] != '\n':
1518
# TODO: this is inefficient - but tuples are short.
1519
new_char = self._request.read_bytes(1)
1521
assert new_char != '', "end of file reading from server."
1522
return _decode_tuple(line)
1524
def query_version(self):
1525
"""Return protocol version number of the server."""
1527
resp = self.read_response_tuple()
1528
if resp == ('ok', '1'):
1531
raise errors.SmartProtocolError("bad response %r" % (resp,))
1534
class SmartClientMedium(object):
1535
"""Smart client is a medium for sending smart protocol requests over."""
1537
def disconnect(self):
1538
"""If this medium maintains a persistent connection, close it.
1540
The default implementation does nothing.
1544
class SmartClientStreamMedium(SmartClientMedium):
1545
"""Stream based medium common class.
1547
SmartClientStreamMediums operate on a stream. All subclasses use a common
1548
SmartClientStreamMediumRequest for their requests, and should implement
1549
_accept_bytes and _read_bytes to allow the request objects to send and
1554
self._current_request = None
1556
def accept_bytes(self, bytes):
1557
self._accept_bytes(bytes)
1560
"""The SmartClientStreamMedium knows how to close the stream when it is
1566
"""Flush the output stream.
1568
This method is used by the SmartClientStreamMediumRequest to ensure that
1569
all data for a request is sent, to avoid long timeouts or deadlocks.
1571
raise NotImplementedError(self._flush)
1573
def get_request(self):
1574
"""See SmartClientMedium.get_request().
1576
SmartClientStreamMedium always returns a SmartClientStreamMediumRequest
1579
return SmartClientStreamMediumRequest(self)
1581
def read_bytes(self, count):
1582
return self._read_bytes(count)
1585
class SmartSimplePipesClientMedium(SmartClientStreamMedium):
1586
"""A client medium using simple pipes.
1588
This client does not manage the pipes: it assumes they will always be open.
1591
def __init__(self, readable_pipe, writeable_pipe):
1592
SmartClientStreamMedium.__init__(self)
1593
self._readable_pipe = readable_pipe
1594
self._writeable_pipe = writeable_pipe
1596
def _accept_bytes(self, bytes):
1597
"""See SmartClientStreamMedium.accept_bytes."""
1598
self._writeable_pipe.write(bytes)
1601
"""See SmartClientStreamMedium._flush()."""
1602
self._writeable_pipe.flush()
1604
def _read_bytes(self, count):
1605
"""See SmartClientStreamMedium._read_bytes."""
1606
return self._readable_pipe.read(count)
1609
class SmartSSHClientMedium(SmartClientStreamMedium):
1610
"""A client medium using SSH."""
1612
def __init__(self, host, port=None, username=None, password=None,
1614
"""Creates a client that will connect on the first use.
1616
:param vendor: An optional override for the ssh vendor to use. See
1617
bzrlib.transport.ssh for details on ssh vendors.
1619
SmartClientStreamMedium.__init__(self)
1620
self._connected = False
1622
self._password = password
1624
self._username = username
1625
self._read_from = None
1626
self._ssh_connection = None
1627
self._vendor = vendor
1628
self._write_to = None
1630
def _accept_bytes(self, bytes):
1631
"""See SmartClientStreamMedium.accept_bytes."""
1632
self._ensure_connection()
1633
self._write_to.write(bytes)
1635
def disconnect(self):
1636
"""See SmartClientMedium.disconnect()."""
1637
if not self._connected:
1639
self._read_from.close()
1640
self._write_to.close()
1641
self._ssh_connection.close()
1642
self._connected = False
1644
def _ensure_connection(self):
1645
"""Connect this medium if not already connected."""
1648
executable = os.environ.get('BZR_REMOTE_PATH', 'bzr')
1649
if self._vendor is None:
1650
vendor = ssh._get_ssh_vendor()
1652
vendor = self._vendor
1653
self._ssh_connection = vendor.connect_ssh(self._username,
1654
self._password, self._host, self._port,
1655
command=[executable, 'serve', '--inet', '--directory=/',
1657
self._read_from, self._write_to = \
1658
self._ssh_connection.get_filelike_channels()
1659
self._connected = True
1662
"""See SmartClientStreamMedium._flush()."""
1663
self._write_to.flush()
1665
def _read_bytes(self, count):
1666
"""See SmartClientStreamMedium.read_bytes."""
1667
if not self._connected:
1668
raise errors.MediumNotConnected(self)
1669
return self._read_from.read(count)
1672
class SmartTCPClientMedium(SmartClientStreamMedium):
1673
"""A client medium using TCP."""
1675
def __init__(self, host, port):
1676
"""Creates a client that will connect on the first use."""
1677
SmartClientStreamMedium.__init__(self)
1678
self._connected = False
1683
def _accept_bytes(self, bytes):
1684
"""See SmartClientMedium.accept_bytes."""
1685
self._ensure_connection()
1686
self._socket.sendall(bytes)
1688
def disconnect(self):
1689
"""See SmartClientMedium.disconnect()."""
1690
if not self._connected:
1692
self._socket.close()
1694
self._connected = False
1696
def _ensure_connection(self):
1697
"""Connect this medium if not already connected."""
1700
self._socket = socket.socket()
1701
self._socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
1702
result = self._socket.connect_ex((self._host, int(self._port)))
1704
raise errors.ConnectionError("failed to connect to %s:%d: %s" %
1705
(self._host, self._port, os.strerror(result)))
1706
self._connected = True
1709
"""See SmartClientStreamMedium._flush().
1711
For TCP we do no flushing. We may want to turn off TCP_NODELAY and
1712
add a means to do a flush, but that can be done in the future.
1715
def _read_bytes(self, count):
1716
"""See SmartClientMedium.read_bytes."""
1717
if not self._connected:
1718
raise errors.MediumNotConnected(self)
1719
return self._socket.recv(count)
1722
class SmartTCPTransport(SmartTransport):
1723
"""Connection to smart server over plain tcp.
1725
This is essentially just a factory to get 'RemoteTransport(url,
1726
SmartTCPClientMedium).
1729
def __init__(self, url):
1730
_scheme, _username, _password, _host, _port, _path = \
1731
transport.split_url(url)
1734
except (ValueError, TypeError), e:
1735
raise errors.InvalidURL(path=url, extra="invalid port %s" % _port)
1736
medium = SmartTCPClientMedium(_host, _port)
1737
super(SmartTCPTransport, self).__init__(url, medium=medium)
1740
class SmartSSHTransport(SmartTransport):
1741
"""Connection to smart server over SSH.
1743
This is essentially just a factory to get 'RemoteTransport(url,
1744
SmartSSHClientMedium).
1747
def __init__(self, url):
1748
_scheme, _username, _password, _host, _port, _path = \
1749
transport.split_url(url)
1751
if _port is not None:
1753
except (ValueError, TypeError), e:
1754
raise errors.InvalidURL(path=url, extra="invalid port %s" %
1756
medium = SmartSSHClientMedium(_host, _port, _username, _password)
1757
super(SmartSSHTransport, self).__init__(url, medium=medium)
1760
class SmartHTTPTransport(SmartTransport):
1761
"""Just a way to connect between a bzr+http:// url and http://.
1763
This connection operates slightly differently than the SmartSSHTransport.
1764
It uses a plain http:// transport underneath, which defines what remote
1765
.bzr/smart URL we are connected to. From there, all paths that are sent are
1766
sent as relative paths, this way, the remote side can properly
1767
de-reference them, since it is likely doing rewrite rules to translate an
1768
HTTP path into a local path.
1771
def __init__(self, url, http_transport=None):
1772
assert url.startswith('bzr+http://')
1774
if http_transport is None:
1775
http_url = url[len('bzr+'):]
1776
self._http_transport = transport.get_transport(http_url)
1778
self._http_transport = http_transport
1779
http_medium = self._http_transport.get_smart_medium()
1780
super(SmartHTTPTransport, self).__init__(url, medium=http_medium)
1782
def _remote_path(self, relpath):
1783
"""After connecting HTTP Transport only deals in relative URLs."""
1789
def abspath(self, relpath):
1790
"""Return the full url to the given relative path.
1792
:param relpath: the relative path or path components
1793
:type relpath: str or list
1795
return self._unparse_url(self._combine_paths(self._path, relpath))
1797
def clone(self, relative_url):
1798
"""Make a new SmartHTTPTransport related to me.
1800
This is re-implemented rather than using the default
1801
SmartTransport.clone() because we must be careful about the underlying
1805
abs_url = self.abspath(relative_url)
1808
# By cloning the underlying http_transport, we are able to share the
1810
new_transport = self._http_transport.clone(relative_url)
1811
return SmartHTTPTransport(abs_url, http_transport=new_transport)
1814
def get_test_permutations():
1815
"""Return (transport, server) permutations for testing."""
1816
### We may need a little more test framework support to construct an
1817
### appropriate RemoteTransport in the future.
1818
return [(SmartTCPTransport, SmartTCPServer_for_testing)]
added
removed
bzrlib/transport/smart.py
