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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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"""Basic server-side logic for dealing with requests."""
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Infrastructure for server-side request handlers.
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Interesting module attributes:
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* The request_handlers registry maps verb names to SmartServerRequest
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* The jail_info threading.local() object is used to prevent accidental
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opening of BzrDirs outside of the backing transport, or any other
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transports placed in jail_info.transports. The jail_info is reset on
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every call into a request handler (which can happen an arbitrary number
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of times during a request).
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# XXX: The class names are a little confusing: the protocol will instantiate a
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# SmartServerRequestHandler, whose dispatch_command method creates an instance
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# of a SmartServerRequest subclass.
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from bzrlib import bzrdir, errors, registry, revision
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from bzrlib.bundle.serializer import write_bundle
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from bzrlib.bundle import serializer
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jail_info = threading.local()
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jail_info.transports = None
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bzrdir.BzrDir.hooks.install_named_hook(
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'pre_open', _pre_open_hook, 'checking server jail')
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def _pre_open_hook(transport):
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allowed_transports = getattr(jail_info, 'transports', None)
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if allowed_transports is None:
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abspath = transport.base
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for allowed_transport in allowed_transports:
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allowed_transport.relpath(abspath)
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except errors.PathNotChild:
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raise errors.JailBreak(abspath)
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class SmartServerRequest(object):
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"""Base class for request handlers.
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To define a new request, subclass this class and override the `do` method
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(and if appropriate, `do_body` as well). Request implementors should take
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care to call `translate_client_path` and `transport_from_client_path` as
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appropriate when dealing with paths received from the client.
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def __init__(self, backing_transport):
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# XXX: rename this class to BaseSmartServerRequestHandler ? A request
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# *handler* is a different concept to the request.
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def __init__(self, backing_transport, root_client_path='/', jail_root=None):
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:param backing_transport: the base transport to be used when performing
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:param root_client_path: the client path that maps to the root of
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backing_transport. This is used to interpret relpaths received
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from the client. Clients will not be able to refer to paths above
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this root. If root_client_path is None, then no translation will
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be performed on client paths. Default is '/'.
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:param jail_root: if specified, the root of the BzrDir.open jail to use
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instead of backing_transport.
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self._backing_transport = backing_transport
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if jail_root is None:
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jail_root = backing_transport
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self._jail_root = jail_root
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if root_client_path is not None:
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if not root_client_path.startswith('/'):
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root_client_path = '/' + root_client_path
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if not root_client_path.endswith('/'):
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root_client_path += '/'
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self._root_client_path = root_client_path
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self._body_chunks = []
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def _check_enabled(self):
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"""Raises DisabledMethod if this method is disabled."""
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def do_body(self, body_bytes):
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"""Called if the client sends a body with the request.
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The do() method is still called, and must have returned None.
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Must return a SmartServerResponse.
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# TODO: if a client erroneously sends a request that shouldn't have a
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# body, what to do? Probably SmartServerRequestHandler should catch
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# this NotImplementedError and translate it into a 'bad request' error
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# to send to the client.
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raise NotImplementedError(self.do_body)
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raise errors.SmartProtocolError('Request does not expect a body')
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def do_chunk(self, chunk_bytes):
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"""Called with each body chunk if the request has a streamed body.
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The do() method is still called, and must have returned None.
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self._body_chunks.append(chunk_bytes)
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"""Called when the end of the request has been received."""
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body_bytes = ''.join(self._body_chunks)
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self._body_chunks = None
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return self.do_body(body_bytes)
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def setup_jail(self):
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jail_info.transports = [self._jail_root]
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def teardown_jail(self):
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jail_info.transports = None
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def translate_client_path(self, client_path):
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"""Translate a path received from a network client into a local
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All paths received from the client *must* be translated.
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:param client_path: the path from the client.
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:returns: a relpath that may be used with self._backing_transport
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(unlike the untranslated client_path, which must not be used with
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the backing transport).
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if self._root_client_path is None:
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# no translation necessary!
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if not client_path.startswith('/'):
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client_path = '/' + client_path
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if client_path + '/' == self._root_client_path:
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if client_path.startswith(self._root_client_path):
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path = client_path[len(self._root_client_path):]
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relpath = urlutils.joinpath('/', path)
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if not relpath.startswith('/'):
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raise ValueError(relpath)
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return urlutils.escape('.' + relpath)
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raise errors.PathNotChild(client_path, self._root_client_path)
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def transport_from_client_path(self, client_path):
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"""Get a backing transport corresponding to the location referred to by
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:seealso: translate_client_path
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:returns: a transport cloned from self._backing_transport
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relpath = self.translate_client_path(client_path)
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return self._backing_transport.clone(relpath)
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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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"""A response to a client request.
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This base class should not be used. Instead use
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SuccessfulSmartServerResponse and FailedSmartServerResponse as appropriate.
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def __init__(self, args, body=None, body_stream=None):
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:param args: tuple of response arguments.
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:param body: string of a response body.
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:param body_stream: iterable of bytestrings to be streamed to the
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if body is not None and body_stream is not None:
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raise errors.BzrError(
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"'body' and 'body_stream' are mutually exclusive.")
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self.body_stream = body_stream
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def __eq__(self, other):
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return other.args == self.args and other.body == self.body
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return (other.args == self.args and
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other.body == self.body and
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other.body_stream is self.body_stream)
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def __repr__(self):
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return "<SmartServerResponse args=%r body=%r>" % (self.args, self.body)
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return "<%s args=%r body=%r>" % (self.__class__.__name__,
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self.args, self.body)
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class FailedSmartServerResponse(SmartServerResponse):
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"""A SmartServerResponse for a request which failed."""
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def is_successful(self):
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"""FailedSmartServerResponse are not successful."""
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class SuccessfulSmartServerResponse(SmartServerResponse):
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"""A SmartServerResponse for a successfully completed request."""
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def is_successful(self):
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"""SuccessfulSmartServerResponse are successful."""
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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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creates responses.
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subclasses. e.g. bzrlib.transport.smart.vfs.vfs_commands.
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self._backing_transport = backing_transport
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self._root_client_path = root_client_path
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self._commands = commands
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self._body_bytes = ''
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if jail_root is None:
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jail_root = backing_transport
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self._jail_root = jail_root
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self.response = None
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self.finished_reading = False
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self._command = None
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if 'hpss' in debug.debug_flags:
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self._request_start_time = osutils.timer_func()
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self._thread_id = thread.get_ident()
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def _trace(self, action, message, extra_bytes=None, include_time=False):
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# It is a bit of a shame that this functionality overlaps with that of
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# ProtocolThreeRequester._trace. However, there is enough difference
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# that just putting it in a helper doesn't help a lot. And some state
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# is taken from the instance.
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t = '%5.3fs ' % (osutils.timer_func() - self._request_start_time)
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if extra_bytes is None:
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extra = ' ' + repr(extra_bytes[:40])
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extra = extra[:29] + extra[-1] + '...'
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trace.mutter('%12s: [%s] %s%s%s'
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% (action, self._thread_id, t, message, extra))
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def accept_body(self, bytes):
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"""Accept body data."""
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# TODO: This should be overriden for each command that desired body data
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# to handle the right format of that data, i.e. plain bytes, a bundle,
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# etc. The deserialisation into that format should be done in the
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# default fallback is to accumulate bytes.
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self._body_bytes += bytes
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if self._command is None:
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# no active command object, so ignore the event.
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self._run_handler_code(self._command.do_chunk, (bytes,), {})
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if 'hpss' in debug.debug_flags:
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self._trace('accept body',
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'%d bytes' % (len(bytes),), bytes)
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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._command.do_body, (self._body_bytes,), {})
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self._run_handler_code(self._command.do_end, (), {})
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# cannot read after this.
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self.finished_reading = True
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def dispatch_command(self, cmd, args):
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"""Deprecated compatibility method.""" # XXX XXX
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command = self._commands.get(cmd)
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raise errors.SmartProtocolError("bad request %r" % (cmd,))
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self._command = command(self._backing_transport)
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self._run_handler_code(self._command.execute, args, {})
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if 'hpss' in debug.debug_flags:
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self._trace('end of body', '', include_time=True)
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def _run_handler_code(self, callable, args, kwargs):
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"""Run some handler specific code 'callable'.
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# XXX: most of this error conversion is VFS-related, and thus ought to
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# be in SmartServerVFSRequestHandler somewhere.
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return callable(*args, **kwargs)
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except errors.NoSuchFile, e:
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return SmartServerResponse(('NoSuchFile', e.path))
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except errors.FileExists, e:
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return SmartServerResponse(('FileExists', e.path))
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except errors.DirectoryNotEmpty, e:
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return SmartServerResponse(('DirectoryNotEmpty', e.path))
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except errors.ShortReadvError, e:
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return SmartServerResponse(('ShortReadvError',
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e.path, str(e.offset), str(e.length), str(e.actual)))
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except UnicodeError, e:
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# If it is a DecodeError, than most likely we are starting
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# with a plain string
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str_or_unicode = e.object
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if isinstance(str_or_unicode, unicode):
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# XXX: UTF-8 might have \x01 (our seperator byte) in it. We
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# should escape it somehow.
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val = 'u:' + str_or_unicode.encode('utf-8')
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val = 's:' + str_or_unicode.encode('base64')
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# This handles UnicodeEncodeError or UnicodeDecodeError
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return SmartServerResponse((e.__class__.__name__,
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e.encoding, val, str(e.start), str(e.end), e.reason))
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except errors.TransportNotPossible, e:
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if e.msg == "readonly transport":
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return SmartServerResponse(('ReadOnlyError', ))
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self._command.setup_jail()
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return callable(*args, **kwargs)
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self._command.teardown_jail()
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except (KeyboardInterrupt, SystemExit):
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except Exception, err:
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err_struct = _translate_error(err)
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return FailedSmartServerResponse(err_struct)
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def headers_received(self, headers):
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# Just a no-op at the moment.
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if 'hpss' in debug.debug_flags:
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self._trace('headers', repr(headers))
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def args_received(self, args):
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command = self._commands.get(cmd)
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if 'hpss' in debug.debug_flags:
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self._trace('hpss unknown request',
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cmd, repr(args)[1:-1])
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raise errors.UnknownSmartMethod(cmd)
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if 'hpss' in debug.debug_flags:
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from bzrlib.smart import vfs
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if issubclass(command, vfs.VfsRequest):
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action = 'hpss vfs req'
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action = 'hpss request'
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'%s %s' % (cmd, repr(args)[1:-1]))
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self._command = command(
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self._backing_transport, self._root_client_path, self._jail_root)
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self._run_handler_code(self._command.execute, args, {})
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def end_received(self):
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if self._command is None:
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# no active command object, so ignore the event.
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self._run_handler_code(self._command.do_end, (), {})
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if 'hpss' in debug.debug_flags:
397
self._trace('end', '', include_time=True)
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def post_body_error_received(self, error_args):
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# Just a no-op at the moment.
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def _translate_error(err):
405
if isinstance(err, errors.NoSuchFile):
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return ('NoSuchFile', err.path)
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elif isinstance(err, errors.FileExists):
408
return ('FileExists', err.path)
409
elif isinstance(err, errors.DirectoryNotEmpty):
410
return ('DirectoryNotEmpty', err.path)
411
elif isinstance(err, errors.IncompatibleRepositories):
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return ('IncompatibleRepositories', str(err.source), str(err.target),
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elif isinstance(err, errors.ShortReadvError):
415
return ('ShortReadvError', err.path, str(err.offset), str(err.length),
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elif isinstance(err, errors.UnstackableRepositoryFormat):
418
return (('UnstackableRepositoryFormat', str(err.format), err.url))
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elif isinstance(err, errors.UnstackableBranchFormat):
420
return ('UnstackableBranchFormat', str(err.format), err.url)
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elif isinstance(err, errors.NotStacked):
422
return ('NotStacked',)
423
elif isinstance(err, UnicodeError):
424
# If it is a DecodeError, than most likely we are starting
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# with a plain string
426
str_or_unicode = err.object
427
if isinstance(str_or_unicode, unicode):
428
# XXX: UTF-8 might have \x01 (our protocol v1 and v2 seperator
429
# byte) in it, so this encoding could cause broken responses.
430
# Newer clients use protocol v3, so will be fine.
431
val = 'u:' + str_or_unicode.encode('utf-8')
433
val = 's:' + str_or_unicode.encode('base64')
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# This handles UnicodeEncodeError or UnicodeDecodeError
435
return (err.__class__.__name__, err.encoding, val, str(err.start),
436
str(err.end), err.reason)
437
elif isinstance(err, errors.TransportNotPossible):
438
if err.msg == "readonly transport":
439
return ('ReadOnlyError', )
440
elif isinstance(err, errors.ReadError):
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# cannot read the file
442
return ('ReadError', err.path)
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elif isinstance(err, errors.PermissionDenied):
444
return ('PermissionDenied', err.path, err.extra)
445
elif isinstance(err, errors.TokenMismatch):
446
return ('TokenMismatch', err.given_token, err.lock_token)
447
elif isinstance(err, errors.LockContention):
448
return ('LockContention',)
449
# Unserialisable error. Log it, and return a generic error
450
trace.log_exception_quietly()
451
return ('error', str(err))
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454
class HelloRequest(SmartServerRequest):
194
"""Answer a version request with my version."""
455
"""Answer a version request with the highest protocol version this server
197
return SmartServerResponse(('ok', '1'))
460
return SuccessfulSmartServerResponse(('ok', '2'))
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463
class GetBundleRequest(SmartServerRequest):
464
"""Get a bundle of from the null revision to the specified revision."""
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466
def do(self, path, revision_id):
203
467
# open transport relative to our base
204
t = self._backing_transport.clone(path)
468
t = self.transport_from_client_path(path)
205
469
control, extra_path = bzrdir.BzrDir.open_containing_from_transport(t)
206
470
repo = control.open_repository()
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471
tmpf = tempfile.TemporaryFile()
208
472
base_revision = revision.NULL_REVISION
209
write_bundle(repo, revision_id, base_revision, tmpf)
473
serializer.write_bundle(repo, revision_id, base_revision, tmpf)
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return SmartServerResponse((), tmpf.read())
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# This exists solely to help RemoteObjectHacking. It should be removed
215
# eventually. It should not be considered part of the real smart server
217
class ProbeDontUseRequest(SmartServerRequest):
220
from bzrlib.bzrdir import BzrDirFormat
221
t = self._backing_transport.clone(path)
222
default_format = BzrDirFormat.get_default_format()
223
real_bzrdir = default_format.open(t, _found=True)
225
real_bzrdir._format.probe_transport(t)
226
except (errors.NotBranchError, errors.UnknownFormatError):
230
return SmartServerResponse((answer,))
475
return SuccessfulSmartServerResponse((), tmpf.read())
233
478
class SmartServerIsReadonly(SmartServerRequest):
241
return SmartServerResponse((answer,))
486
return SuccessfulSmartServerResponse((answer,))
244
489
request_handlers = registry.Registry()
245
490
request_handlers.register_lazy(
246
491
'append', 'bzrlib.smart.vfs', 'AppendRequest')
247
492
request_handlers.register_lazy(
248
'Branch.get_config_file', 'bzrlib.smart.branch', 'SmartServerBranchGetConfigFile')
493
'Branch.get_config_file', 'bzrlib.smart.branch',
494
'SmartServerBranchGetConfigFile')
495
request_handlers.register_lazy(
496
'Branch.get_parent', 'bzrlib.smart.branch', 'SmartServerBranchGetParent')
497
request_handlers.register_lazy(
498
'Branch.get_tags_bytes', 'bzrlib.smart.branch',
499
'SmartServerBranchGetTagsBytes')
500
request_handlers.register_lazy(
501
'Branch.set_tags_bytes', 'bzrlib.smart.branch',
502
'SmartServerBranchSetTagsBytes')
503
request_handlers.register_lazy(
504
'Branch.get_stacked_on_url', 'bzrlib.smart.branch', 'SmartServerBranchRequestGetStackedOnURL')
249
505
request_handlers.register_lazy(
250
506
'Branch.last_revision_info', 'bzrlib.smart.branch', 'SmartServerBranchRequestLastRevisionInfo')
251
507
request_handlers.register_lazy(
252
508
'Branch.lock_write', 'bzrlib.smart.branch', 'SmartServerBranchRequestLockWrite')
253
request_handlers.register_lazy(
254
'Branch.revision_history', 'bzrlib.smart.branch', 'SmartServerRequestRevisionHistory')
255
request_handlers.register_lazy(
256
'Branch.set_last_revision', 'bzrlib.smart.branch', 'SmartServerBranchRequestSetLastRevision')
509
request_handlers.register_lazy( 'Branch.revision_history',
510
'bzrlib.smart.branch', 'SmartServerRequestRevisionHistory')
511
request_handlers.register_lazy( 'Branch.set_config_option',
512
'bzrlib.smart.branch', 'SmartServerBranchRequestSetConfigOption')
513
request_handlers.register_lazy( 'Branch.set_last_revision',
514
'bzrlib.smart.branch', 'SmartServerBranchRequestSetLastRevision')
515
request_handlers.register_lazy(
516
'Branch.set_last_revision_info', 'bzrlib.smart.branch',
517
'SmartServerBranchRequestSetLastRevisionInfo')
518
request_handlers.register_lazy(
519
'Branch.set_last_revision_ex', 'bzrlib.smart.branch',
520
'SmartServerBranchRequestSetLastRevisionEx')
521
request_handlers.register_lazy(
522
'Branch.set_parent_location', 'bzrlib.smart.branch',
523
'SmartServerBranchRequestSetParentLocation')
257
524
request_handlers.register_lazy(
258
525
'Branch.unlock', 'bzrlib.smart.branch', 'SmartServerBranchRequestUnlock')
259
526
request_handlers.register_lazy(
260
'BzrDir.find_repository', 'bzrlib.smart.bzrdir', 'SmartServerRequestFindRepository')
261
request_handlers.register_lazy(
262
'BzrDirFormat.initialize', 'bzrlib.smart.bzrdir', 'SmartServerRequestInitializeBzrDir')
263
request_handlers.register_lazy(
264
'BzrDir.open_branch', 'bzrlib.smart.bzrdir', 'SmartServerRequestOpenBranch')
527
'BzrDir.cloning_metadir', 'bzrlib.smart.bzrdir',
528
'SmartServerBzrDirRequestCloningMetaDir')
529
request_handlers.register_lazy(
530
'BzrDir.create_branch', 'bzrlib.smart.bzrdir',
531
'SmartServerRequestCreateBranch')
532
request_handlers.register_lazy(
533
'BzrDir.create_repository', 'bzrlib.smart.bzrdir',
534
'SmartServerRequestCreateRepository')
535
request_handlers.register_lazy(
536
'BzrDir.find_repository', 'bzrlib.smart.bzrdir',
537
'SmartServerRequestFindRepositoryV1')
538
request_handlers.register_lazy(
539
'BzrDir.find_repositoryV2', 'bzrlib.smart.bzrdir',
540
'SmartServerRequestFindRepositoryV2')
541
request_handlers.register_lazy(
542
'BzrDir.find_repositoryV3', 'bzrlib.smart.bzrdir',
543
'SmartServerRequestFindRepositoryV3')
544
request_handlers.register_lazy(
545
'BzrDir.get_config_file', 'bzrlib.smart.bzrdir',
546
'SmartServerBzrDirRequestConfigFile')
547
request_handlers.register_lazy(
548
'BzrDirFormat.initialize', 'bzrlib.smart.bzrdir',
549
'SmartServerRequestInitializeBzrDir')
550
request_handlers.register_lazy(
551
'BzrDirFormat.initialize_ex_1.16', 'bzrlib.smart.bzrdir',
552
'SmartServerRequestBzrDirInitializeEx')
553
request_handlers.register_lazy(
554
'BzrDir.open', 'bzrlib.smart.bzrdir', 'SmartServerRequestOpenBzrDir')
555
request_handlers.register_lazy(
556
'BzrDir.open_2.1', 'bzrlib.smart.bzrdir', 'SmartServerRequestOpenBzrDir_2_1')
557
request_handlers.register_lazy(
558
'BzrDir.open_branch', 'bzrlib.smart.bzrdir',
559
'SmartServerRequestOpenBranch')
560
request_handlers.register_lazy(
561
'BzrDir.open_branchV2', 'bzrlib.smart.bzrdir',
562
'SmartServerRequestOpenBranchV2')
563
request_handlers.register_lazy(
564
'BzrDir.open_branchV3', 'bzrlib.smart.bzrdir',
565
'SmartServerRequestOpenBranchV3')
265
566
request_handlers.register_lazy(
266
567
'delete', 'bzrlib.smart.vfs', 'DeleteRequest')
267
568
request_handlers.register_lazy(
288
589
'readv', 'bzrlib.smart.vfs', 'ReadvRequest')
289
590
request_handlers.register_lazy(
290
591
'rename', 'bzrlib.smart.vfs', 'RenameRequest')
592
request_handlers.register_lazy(
593
'PackRepository.autopack', 'bzrlib.smart.packrepository',
594
'SmartServerPackRepositoryAutopack')
291
595
request_handlers.register_lazy('Repository.gather_stats',
292
596
'bzrlib.smart.repository',
293
597
'SmartServerRepositoryGatherStats')
598
request_handlers.register_lazy('Repository.get_parent_map',
599
'bzrlib.smart.repository',
600
'SmartServerRepositoryGetParentMap')
294
601
request_handlers.register_lazy(
295
602
'Repository.get_revision_graph', 'bzrlib.smart.repository', 'SmartServerRepositoryGetRevisionGraph')
296
603
request_handlers.register_lazy(
297
604
'Repository.has_revision', 'bzrlib.smart.repository', 'SmartServerRequestHasRevision')
298
605
request_handlers.register_lazy(
606
'Repository.insert_stream', 'bzrlib.smart.repository', 'SmartServerRepositoryInsertStream')
607
request_handlers.register_lazy(
608
'Repository.insert_stream_1.19', 'bzrlib.smart.repository', 'SmartServerRepositoryInsertStream_1_19')
609
request_handlers.register_lazy(
610
'Repository.insert_stream_locked', 'bzrlib.smart.repository', 'SmartServerRepositoryInsertStreamLocked')
611
request_handlers.register_lazy(
299
612
'Repository.is_shared', 'bzrlib.smart.repository', 'SmartServerRepositoryIsShared')
300
613
request_handlers.register_lazy(
301
614
'Repository.lock_write', 'bzrlib.smart.repository', 'SmartServerRepositoryLockWrite')
302
615
request_handlers.register_lazy(
616
'Repository.set_make_working_trees', 'bzrlib.smart.repository',
617
'SmartServerRepositorySetMakeWorkingTrees')
618
request_handlers.register_lazy(
303
619
'Repository.unlock', 'bzrlib.smart.repository', 'SmartServerRepositoryUnlock')
304
620
request_handlers.register_lazy(
621
'Repository.get_rev_id_for_revno', 'bzrlib.smart.repository',
622
'SmartServerRepositoryGetRevIdForRevno')
623
request_handlers.register_lazy(
624
'Repository.get_stream', 'bzrlib.smart.repository',
625
'SmartServerRepositoryGetStream')
626
request_handlers.register_lazy(
627
'Repository.get_stream_1.19', 'bzrlib.smart.repository',
628
'SmartServerRepositoryGetStream_1_19')
629
request_handlers.register_lazy(
630
'Repository.tarball', 'bzrlib.smart.repository',
631
'SmartServerRepositoryTarball')
632
request_handlers.register_lazy(
305
633
'rmdir', 'bzrlib.smart.vfs', 'RmdirRequest')
306
634
request_handlers.register_lazy(
307
635
'stat', 'bzrlib.smart.vfs', 'StatRequest')
308
636
request_handlers.register_lazy(
309
637
'Transport.is_readonly', 'bzrlib.smart.request', 'SmartServerIsReadonly')
310
request_handlers.register_lazy(
311
'probe_dont_use', 'bzrlib.smart.request', 'ProbeDontUseRequest')
added
removed
bzrlib/smart/request.py
