31
from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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32
from bzrlib import (
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from bzrlib.smart import client, protocol, request, vfs
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from bzrlib.smart.protocol import (
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MESSAGE_VERSION_THREE,
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SmartClientRequestProtocolOne,
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SmartServerRequestProtocolOne,
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SmartServerRequestProtocolTwo,
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build_server_protocol_three
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from bzrlib.transport import ssh
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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
57
49
def _get_protocol_factory_for_bytes(bytes):
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"""Determine the right protocol factory for 'bytes'.
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67
root_client_path. unused_bytes are any bytes that were not part of a
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68
protocol version marker.
78
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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if bytes.startswith(MESSAGE_VERSION_THREE):
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protocol_factory = build_server_protocol_three
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bytes = bytes[len(MESSAGE_VERSION_THREE):]
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elif bytes.startswith(REQUEST_VERSION_TWO):
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protocol_factory = SmartServerRequestProtocolTwo
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bytes = bytes[len(REQUEST_VERSION_TWO):]
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protocol_factory = protocol.SmartServerRequestProtocolOne
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protocol_factory = 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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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
203
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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.finished = False
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SmartMedium.__init__(self)
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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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"""Serve requests until the client disconnects."""
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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 _read_bytes(self, desired_count):
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def _get_bytes(self, desired_count):
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"""Get some bytes from the medium.
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181
:param desired_count: number of bytes we want to read.
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raise NotImplementedError(self._read_bytes)
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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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while newline_pos == -1:
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new_bytes = self._get_bytes(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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self._push_back(bytes[newline_pos+1:])
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class SmartServerSocketStreamMedium(SmartServerStreamMedium):
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def _serve_one_request_unguarded(self, protocol):
275
221
while protocol.next_read_size():
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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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bytes = self._get_bytes(4096)
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self.finished = True
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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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def _get_bytes(self, desired_count):
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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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# 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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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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self.finished = True
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def _write_out(self, 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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osutils.send_all(self.socket, bytes)
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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 SmartClientMediumRequest.read_bytes.
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"""Helper for 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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return self._medium.read_bytes(count)
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raise NotImplementedError(self._read_bytes)
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def read_line(self):
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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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"""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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# end of file encountered reading from server
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raise errors.ConnectionReset(
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"please check connectivity and permissions",
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"(and try -Dhpss if further diagnosis is required)")
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def _read_line(self):
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"""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.
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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
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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)
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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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class SmartClientMedium(object):
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"""Smart client is a medium for sending smart protocol requests over."""
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def __init__(self, base):
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if (self._remote_version_is_before is not None and
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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
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# appropriately (it should simply not have been tried).
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raise AssertionError(
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"_remember_remote_is_before(%r) called, but "
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"_remember_remote_is_before(%r) was called previously."
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, version_tuple, self._remote_version_is_before)
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if 'hpss' in debug.debug_flags:
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ui.ui_factory.show_warning(
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"_remember_remote_is_before(%r) called, but "
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"_remember_remote_is_before(%r) was called previously."
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% (version_tuple, self._remote_version_is_before))
480
% (version_tuple, self._remote_version_is_before))
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self._remote_version_is_before = version_tuple
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def protocol_version(self):
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572
return SmartClientStreamMediumRequest(self)
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def read_bytes(self, count):
575
return self._read_bytes(count)
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class SmartSimplePipesClientMedium(SmartClientStreamMedium):
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579
"""A client medium using simple pipes.
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This client does not manage the pipes: it assumes they will always be open.
719
Note that if readable_pipe.read might raise IOError or OSError with errno
720
of EINTR, it must be safe to retry the read. Plain CPython fileobjects
721
(such as used for sys.stdin) are safe.
724
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def __init__(self, readable_pipe, writeable_pipe, base):
738
597
def _read_bytes(self, count):
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"""See SmartClientStreamMedium._read_bytes."""
740
bytes = osutils.until_no_eintr(self._readable_pipe.read, count)
741
self._report_activity(len(bytes), 'read')
599
return self._readable_pipe.read(count)
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class SmartSSHClientMedium(SmartClientStreamMedium):
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"""A client medium using SSH."""
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def __init__(self, host, port=None, username=None, password=None,
749
606
base=None, vendor=None, bzr_remote_path=None):
750
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"""Creates a client that will connect on the first use.
752
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:param vendor: An optional override for the ssh vendor to use. See
753
610
bzrlib.transport.ssh for details on ssh vendors.
612
SmartClientStreamMedium.__init__(self, base)
755
613
self._connected = False
756
614
self._host = host
757
615
self._password = password
758
616
self._port = port
759
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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)
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self._read_from = None
768
619
self._ssh_connection = None
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self._vendor = vendor
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621
self._write_to = None
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self._bzr_remote_path = bzr_remote_path
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if self._port is None:
777
maybe_port = ':%s' % self._port
778
return "%s(%s://%s@%s%s/)" % (
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self.__class__.__name__,
623
if self._bzr_remote_path is None:
624
symbol_versioning.warn(
625
'bzr_remote_path is required as of bzr 0.92',
626
DeprecationWarning, stacklevel=2)
627
self._bzr_remote_path = os.environ.get('BZR_REMOTE_PATH', 'bzr')
785
629
def _accept_bytes(self, bytes):
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630
"""See SmartClientStreamMedium.accept_bytes."""
787
631
self._ensure_connection()
788
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self._write_to.write(bytes)
789
self._report_activity(len(bytes), 'write')
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634
def disconnect(self):
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635
"""See SmartClientMedium.disconnect()."""
821
664
"""See SmartClientStreamMedium.read_bytes."""
822
665
if not self._connected:
823
666
raise errors.MediumNotConnected(self)
824
bytes_to_read = min(count, _MAX_READ_SIZE)
825
bytes = self._read_from.read(bytes_to_read)
826
self._report_activity(len(bytes), 'read')
667
return self._read_from.read(count)
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670
# Port 4155 is the default port for bzr://, registered with IANA.
831
BZR_DEFAULT_INTERFACE = None
671
BZR_DEFAULT_INTERFACE = '0.0.0.0'
832
672
BZR_DEFAULT_PORT = 4155
835
675
class SmartTCPClientMedium(SmartClientStreamMedium):
836
676
"""A client medium using TCP."""
838
678
def __init__(self, host, port, base):
839
679
"""Creates a client that will connect on the first use."""
840
680
SmartClientStreamMedium.__init__(self, base)
860
700
"""Connect this medium if not already connected."""
861
701
if self._connected:
703
self._socket = socket.socket()
704
self._socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
863
705
if self._port is None:
864
706
port = BZR_DEFAULT_PORT
866
708
port = int(self._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:
710
self._socket.connect((self._host, port))
711
except socket.error, err:
888
712
# socket errors either have a (string) or (errno, string) as their
890
714
if type(err.args) is str:
added
removed
bzrlib/smart/medium.py
