31
from bzrlib.lazy_import import lazy_import
32
lazy_import(globals(), """
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38
from bzrlib import (
35
from bzrlib.smart.protocol import (
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SmartServerRequestProtocolOne,
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SmartServerRequestProtocolTwo,
46
from bzrlib.smart import client, protocol, request, vfs
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47
from bzrlib.transport import ssh
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class SmartServerStreamMedium(object):
49
from bzrlib import osutils
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# Throughout this module buffer size parameters are either limited to be at
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# most _MAX_READ_SIZE, or are ignored and _MAX_READ_SIZE is used instead.
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# For this module's purposes, MAX_SOCKET_CHUNK is a reasonable size for reads
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# from non-sockets as well.
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_MAX_READ_SIZE = osutils.MAX_SOCKET_CHUNK
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def _get_protocol_factory_for_bytes(bytes):
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"""Determine the right protocol factory for 'bytes'.
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This will return an appropriate protocol factory depending on the version
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of the protocol being used, as determined by inspecting the given bytes.
62
The bytes should have at least one newline byte (i.e. be a whole line),
63
otherwise it's possible that a request will be incorrectly identified as
66
Typical use would be::
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factory, unused_bytes = _get_protocol_factory_for_bytes(bytes)
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server_protocol = factory(transport, write_func, root_client_path)
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server_protocol.accept_bytes(unused_bytes)
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:param bytes: a str of bytes of the start of the request.
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:returns: 2-tuple of (protocol_factory, unused_bytes). protocol_factory is
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a callable that takes three args: transport, write_func,
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root_client_path. unused_bytes are any bytes that were not part of a
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protocol version marker.
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if bytes.startswith(protocol.MESSAGE_VERSION_THREE):
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protocol_factory = protocol.build_server_protocol_three
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bytes = bytes[len(protocol.MESSAGE_VERSION_THREE):]
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elif bytes.startswith(protocol.REQUEST_VERSION_TWO):
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protocol_factory = protocol.SmartServerRequestProtocolTwo
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bytes = bytes[len(protocol.REQUEST_VERSION_TWO):]
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protocol_factory = protocol.SmartServerRequestProtocolOne
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return protocol_factory, bytes
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def _get_line(read_bytes_func):
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"""Read bytes using read_bytes_func until a newline byte.
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This isn't particularly efficient, so should only be used when the
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expected size of the line is quite short.
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:returns: a tuple of two strs: (line, excess)
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while newline_pos == -1:
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new_bytes = read_bytes_func(1)
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# Ran out of bytes before receiving a complete line.
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newline_pos = bytes.find('\n')
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line = bytes[:newline_pos+1]
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excess = bytes[newline_pos+1:]
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class SmartMedium(object):
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"""Base class for smart protocol media, both client- and server-side."""
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self._push_back_buffer = None
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def _push_back(self, bytes):
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"""Return unused bytes to the medium, because they belong to the next
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This sets the _push_back_buffer to the given bytes.
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if self._push_back_buffer is not None:
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raise AssertionError(
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"_push_back called when self._push_back_buffer is %r"
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% (self._push_back_buffer,))
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self._push_back_buffer = bytes
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def _get_push_back_buffer(self):
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if self._push_back_buffer == '':
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raise AssertionError(
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'%s._push_back_buffer should never be the empty string, '
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'which can be confused with EOF' % (self,))
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bytes = self._push_back_buffer
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self._push_back_buffer = None
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def read_bytes(self, desired_count):
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"""Read some bytes from this medium.
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:returns: some bytes, possibly more or less than the number requested
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in 'desired_count' depending on the medium.
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if self._push_back_buffer is not None:
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return self._get_push_back_buffer()
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bytes_to_read = min(desired_count, _MAX_READ_SIZE)
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return self._read_bytes(bytes_to_read)
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def _read_bytes(self, count):
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raise NotImplementedError(self._read_bytes)
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"""Read bytes from this request's response until a newline byte.
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This isn't particularly efficient, so should only be used when the
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expected size of the line is quite short.
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:returns: a string of bytes ending in a newline (byte 0x0A).
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line, excess = _get_line(self.read_bytes)
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self._push_back(excess)
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def _report_activity(self, bytes, direction):
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"""Notify that this medium has activity.
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Implementations should call this from all methods that actually do IO.
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Be careful that it's not called twice, if one method is implemented on
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:param bytes: Number of bytes read or written.
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:param direction: 'read' or 'write' or None.
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ui.ui_factory.report_transport_activity(self, bytes, direction)
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class SmartServerStreamMedium(SmartMedium):
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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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"""Called when an unhandled exception from the protocol occurs."""
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raise NotImplementedError(self.terminate_due_to_error)
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def _get_bytes(self, desired_count):
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def _read_bytes(self, desired_count):
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"""Get some bytes from the medium.
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:param desired_count: number of bytes we want to read.
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raise NotImplementedError(self._get_bytes)
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"""Read bytes from this request's response until a newline byte.
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This isn't particularly efficient, so should only be used when the
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expected size of the line is quite short.
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:returns: a string of bytes ending in a newline (byte 0x0A).
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# XXX: this duplicates SmartClientRequestProtocolOne._recv_tuple
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while not line or line[-1] != '\n':
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new_char = self._get_bytes(1)
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# Ran out of bytes before receiving a complete line.
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raise NotImplementedError(self._read_bytes)
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class SmartServerSocketStreamMedium(SmartServerStreamMedium):
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def __init__(self, sock, backing_transport):
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def __init__(self, sock, backing_transport, root_client_path='/'):
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:param sock: the socket the server will read from. It will be put
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into blocking mode.
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SmartServerStreamMedium.__init__(self, backing_transport)
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SmartServerStreamMedium.__init__(
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self, backing_transport, root_client_path=root_client_path)
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sock.setblocking(True)
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self.socket = sock
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def _serve_one_request_unguarded(self, protocol):
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275
while protocol.next_read_size():
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protocol.accept_bytes(self.push_back)
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bytes = self._get_bytes(4096)
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protocol.accept_bytes(bytes)
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self.push_back = protocol.excess_buffer
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def _get_bytes(self, desired_count):
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# We ignore the desired_count because on sockets it's more efficient to
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return self.socket.recv(4096)
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# We can safely try to read large chunks. If there is less data
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# than MAX_SOCKET_CHUNK ready, the socket will just return a
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# short read immediately rather than block.
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bytes = self.read_bytes(osutils.MAX_SOCKET_CHUNK)
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protocol.accept_bytes(bytes)
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self._push_back(protocol.unused_data)
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def _read_bytes(self, desired_count):
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return osutils.read_bytes_from_socket(
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self.socket, self._report_activity)
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291
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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self.socket.close()
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self.finished = True
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def _write_out(self, bytes):
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self.socket.sendall(bytes)
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tstart = osutils.timer_func()
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osutils.send_all(self.socket, bytes, self._report_activity)
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if 'hpss' in debug.debug_flags:
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thread_id = thread.get_ident()
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trace.mutter('%12s: [%s] %d bytes to the socket in %.3fs'
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% ('wrote', thread_id, len(bytes),
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osutils.timer_func() - tstart))
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class SmartServerPipeStreamMedium(SmartServerStreamMedium):
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return self._read_bytes(count)
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def _read_bytes(self, count):
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"""Helper for read_bytes.
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"""Helper for SmartClientMediumRequest.read_bytes.
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read_bytes checks the state of the request to determing if bytes
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should be read. After that it hands off to _read_bytes to do the
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By default this forwards to self._medium.read_bytes because we are
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operating on the medium's stream.
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raise NotImplementedError(self._read_bytes)
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return self._medium.read_bytes(count)
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def read_line(self):
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"""Read bytes from this request's response until a newline byte.
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This isn't particularly efficient, so should only be used when the
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expected size of the line is quite short.
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:returns: a string of bytes ending in a newline (byte 0x0A).
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# XXX: this duplicates SmartClientRequestProtocolOne._recv_tuple
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while not line or line[-1] != '\n':
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new_char = self.read_bytes(1)
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raise errors.SmartProtocolError(
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'unexpected end of file reading from server')
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line = self._read_line()
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if not line.endswith('\n'):
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# end of file encountered reading from server
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raise errors.ConnectionReset(
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"Unexpected end of message. Please check connectivity "
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"and permissions, and report a bug if problems persist.")
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class SmartClientMedium(object):
485
def _read_line(self):
486
"""Helper for SmartClientMediumRequest.read_line.
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By default this forwards to self._medium._get_line because we are
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operating on the medium's stream.
491
return self._medium._get_line()
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class _DebugCounter(object):
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"""An object that counts the HPSS calls made to each client medium.
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When a medium is garbage-collected, or failing that when atexit functions
498
are run, the total number of calls made on that medium are reported via
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self.counts = weakref.WeakKeyDictionary()
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client._SmartClient.hooks.install_named_hook(
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'call', self.increment_call_count, 'hpss call counter')
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atexit.register(self.flush_all)
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def track(self, medium):
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"""Start tracking calls made to a medium.
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This only keeps a weakref to the medium, so shouldn't affect the
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medium_repr = repr(medium)
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# Add this medium to the WeakKeyDictionary
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self.counts[medium] = dict(count=0, vfs_count=0,
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medium_repr=medium_repr)
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# Weakref callbacks are fired in reverse order of their association
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# with the referenced object. So we add a weakref *after* adding to
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# the WeakKeyDict so that we can report the value from it before the
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# entry is removed by the WeakKeyDict's own callback.
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ref = weakref.ref(medium, self.done)
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def increment_call_count(self, params):
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# Increment the count in the WeakKeyDictionary
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value = self.counts[params.medium]
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request_method = request.request_handlers.get(params.method)
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# A method we don't know about doesn't count as a VFS method.
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if issubclass(request_method, vfs.VfsRequest):
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value['vfs_count'] += 1
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value = self.counts[ref]
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count, vfs_count, medium_repr = (
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value['count'], value['vfs_count'], value['medium_repr'])
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# In case this callback is invoked for the same ref twice (by the
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# weakref callback and by the atexit function), set the call count back
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# to 0 so this item won't be reported twice.
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value['vfs_count'] = 0
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trace.note('HPSS calls: %d (%d vfs) %s',
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count, vfs_count, medium_repr)
550
for ref in list(self.counts.keys()):
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_debug_counter = None
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class SmartClientMedium(SmartMedium):
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557
"""Smart client is a medium for sending smart protocol requests over."""
559
def __init__(self, base):
560
super(SmartClientMedium, self).__init__()
562
self._protocol_version_error = None
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self._protocol_version = None
564
self._done_hello = False
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# Be optimistic: we assume the remote end can accept new remote
566
# requests until we get an error saying otherwise.
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# _remote_version_is_before tracks the bzr version the remote side
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# can be based on what we've seen so far.
569
self._remote_version_is_before = None
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# Install debug hook function if debug flag is set.
571
if 'hpss' in debug.debug_flags:
572
global _debug_counter
573
if _debug_counter is None:
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_debug_counter = _DebugCounter()
575
_debug_counter.track(self)
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def _is_remote_before(self, version_tuple):
578
"""Is it possible the remote side supports RPCs for a given version?
582
needed_version = (1, 2)
583
if medium._is_remote_before(needed_version):
584
fallback_to_pre_1_2_rpc()
588
except UnknownSmartMethod:
589
medium._remember_remote_is_before(needed_version)
590
fallback_to_pre_1_2_rpc()
592
:seealso: _remember_remote_is_before
594
if self._remote_version_is_before is None:
595
# So far, the remote side seems to support everything
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return version_tuple >= self._remote_version_is_before
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def _remember_remote_is_before(self, version_tuple):
600
"""Tell this medium that the remote side is older the given version.
602
:seealso: _is_remote_before
604
if (self._remote_version_is_before is not None and
605
version_tuple > self._remote_version_is_before):
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# We have been told that the remote side is older than some version
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# which is newer than a previously supplied older-than version.
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# This indicates that some smart verb call is not guarded
609
# appropriately (it should simply not have been tried).
611
"_remember_remote_is_before(%r) called, but "
612
"_remember_remote_is_before(%r) was called previously."
613
, version_tuple, self._remote_version_is_before)
614
if 'hpss' in debug.debug_flags:
615
ui.ui_factory.show_warning(
616
"_remember_remote_is_before(%r) called, but "
617
"_remember_remote_is_before(%r) was called previously."
618
% (version_tuple, self._remote_version_is_before))
620
self._remote_version_is_before = version_tuple
622
def protocol_version(self):
623
"""Find out if 'hello' smart request works."""
624
if self._protocol_version_error is not None:
625
raise self._protocol_version_error
626
if not self._done_hello:
628
medium_request = self.get_request()
629
# Send a 'hello' request in protocol version one, for maximum
630
# backwards compatibility.
631
client_protocol = protocol.SmartClientRequestProtocolOne(medium_request)
632
client_protocol.query_version()
633
self._done_hello = True
634
except errors.SmartProtocolError, e:
635
# Cache the error, just like we would cache a successful
637
self._protocol_version_error = e
641
def should_probe(self):
642
"""Should RemoteBzrDirFormat.probe_transport send a smart request on
645
Some transports are unambiguously smart-only; there's no need to check
646
if the transport is able to carry smart requests, because that's all
647
it is for. In those cases, this method should return False.
649
But some HTTP transports can sometimes fail to carry smart requests,
650
but still be usuable for accessing remote bzrdirs via plain file
651
accesses. So for those transports, their media should return True here
652
so that RemoteBzrDirFormat can determine if it is appropriate for that
368
657
def disconnect(self):
369
658
"""If this medium maintains a persistent connection, close it.
371
660
The default implementation does nothing.
663
def remote_path_from_transport(self, transport):
664
"""Convert transport into a path suitable for using in a request.
666
Note that the resulting remote path doesn't encode the host name or
667
anything but path, so it is only safe to use it in requests sent over
668
the medium from the matching transport.
670
medium_base = urlutils.join(self.base, '/')
671
rel_url = urlutils.relative_url(medium_base, transport.base)
672
return urllib.unquote(rel_url)
375
675
class SmartClientStreamMedium(SmartClientMedium):
376
676
"""Stream based medium common class.
435
738
def _read_bytes(self, count):
436
739
"""See SmartClientStreamMedium._read_bytes."""
437
return self._readable_pipe.read(count)
740
bytes = osutils.until_no_eintr(self._readable_pipe.read, count)
741
self._report_activity(len(bytes), 'read')
440
745
class SmartSSHClientMedium(SmartClientStreamMedium):
441
746
"""A client medium using SSH."""
443
748
def __init__(self, host, port=None, username=None, password=None,
444
vendor=None, bzr_remote_path=None):
749
base=None, vendor=None, bzr_remote_path=None):
445
750
"""Creates a client that will connect on the first use.
447
752
:param vendor: An optional override for the ssh vendor to use. See
448
753
bzrlib.transport.ssh for details on ssh vendors.
450
SmartClientStreamMedium.__init__(self)
451
755
self._connected = False
452
756
self._host = host
453
757
self._password = password
454
758
self._port = port
455
759
self._username = username
760
# for the benefit of progress making a short description of this
762
self._scheme = 'bzr+ssh'
763
# SmartClientStreamMedium stores the repr of this object in its
764
# _DebugCounter so we have to store all the values used in our repr
765
# method before calling the super init.
766
SmartClientStreamMedium.__init__(self, base)
456
767
self._read_from = None
457
768
self._ssh_connection = None
458
769
self._vendor = vendor
459
770
self._write_to = None
460
771
self._bzr_remote_path = bzr_remote_path
461
if self._bzr_remote_path is None:
462
symbol_versioning.warn(
463
'bzr_remote_path is required as of bzr 0.92',
464
DeprecationWarning, stacklevel=2)
465
self._bzr_remote_path = os.environ.get('BZR_REMOTE_PATH', 'bzr')
774
if self._port is None:
777
maybe_port = ':%s' % self._port
778
return "%s(%s://%s@%s%s/)" % (
779
self.__class__.__name__,
467
785
def _accept_bytes(self, bytes):
468
786
"""See SmartClientStreamMedium.accept_bytes."""
469
787
self._ensure_connection()
470
788
self._write_to.write(bytes)
789
self._report_activity(len(bytes), 'write')
472
791
def disconnect(self):
473
792
"""See SmartClientMedium.disconnect()."""
538
860
"""Connect this medium if not already connected."""
539
861
if self._connected:
541
self._socket = socket.socket()
542
self._socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
543
863
if self._port is None:
544
864
port = BZR_DEFAULT_PORT
546
866
port = int(self._port)
547
result = self._socket.connect_ex((self._host, port))
868
sockaddrs = socket.getaddrinfo(self._host, port, socket.AF_UNSPEC,
869
socket.SOCK_STREAM, 0, 0)
870
except socket.gaierror, (err_num, err_msg):
871
raise errors.ConnectionError("failed to lookup %s:%d: %s" %
872
(self._host, port, err_msg))
873
# Initialize err in case there are no addresses returned:
874
err = socket.error("no address found for %s" % self._host)
875
for (family, socktype, proto, canonname, sockaddr) in sockaddrs:
877
self._socket = socket.socket(family, socktype, proto)
878
self._socket.setsockopt(socket.IPPROTO_TCP,
879
socket.TCP_NODELAY, 1)
880
self._socket.connect(sockaddr)
881
except socket.error, err:
882
if self._socket is not None:
887
if self._socket is None:
888
# socket errors either have a (string) or (errno, string) as their
890
if type(err.args) is str:
893
err_msg = err.args[1]
549
894
raise errors.ConnectionError("failed to connect to %s:%d: %s" %
550
(self._host, port, os.strerror(result)))
895
(self._host, port, err_msg))
551
896
self._connected = True
553
898
def _flush(self):
554
899
"""See SmartClientStreamMedium._flush().
556
For TCP we do no flushing. We may want to turn off TCP_NODELAY and
901
For TCP we do no flushing. We may want to turn off TCP_NODELAY and
557
902
add a means to do a flush, but that can be done in the future.
added
removed
bzrlib/smart/medium.py
