779 lines
24 KiB
Python
779 lines
24 KiB
Python
#
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# A higher level module for using sockets (or Windows named pipes)
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#
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# multiprocessing/connection.py
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#
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# Copyright (c) 2006-2008, R Oudkerk
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. Neither the name of author nor the names of any contributors may be
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# used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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__all__ = [ 'Client', 'Listener', 'Pipe' ]
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import io
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import os
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import sys
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import pickle
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import select
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import socket
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import struct
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import errno
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import time
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import tempfile
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import itertools
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import _multiprocessing
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from multiprocessing import current_process, AuthenticationError, BufferTooShort
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from multiprocessing.util import (
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get_temp_dir, Finalize, sub_debug, debug, _eintr_retry)
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try:
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from _multiprocessing import win32
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from _subprocess import WAIT_OBJECT_0, WAIT_TIMEOUT, INFINITE
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except ImportError:
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if sys.platform == 'win32':
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raise
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win32 = None
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_select = _eintr_retry(select.select)
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#
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#
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#
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BUFSIZE = 8192
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# A very generous timeout when it comes to local connections...
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CONNECTION_TIMEOUT = 20.
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_mmap_counter = itertools.count()
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default_family = 'AF_INET'
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families = ['AF_INET']
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if hasattr(socket, 'AF_UNIX'):
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default_family = 'AF_UNIX'
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families += ['AF_UNIX']
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if sys.platform == 'win32':
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default_family = 'AF_PIPE'
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families += ['AF_PIPE']
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def _init_timeout(timeout=CONNECTION_TIMEOUT):
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return time.time() + timeout
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def _check_timeout(t):
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return time.time() > t
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#
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#
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#
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def arbitrary_address(family):
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'''
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Return an arbitrary free address for the given family
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'''
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if family == 'AF_INET':
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return ('localhost', 0)
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elif family == 'AF_UNIX':
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return tempfile.mktemp(prefix='listener-', dir=get_temp_dir())
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elif family == 'AF_PIPE':
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return tempfile.mktemp(prefix=r'\\.\pipe\pyc-%d-%d-' %
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(os.getpid(), next(_mmap_counter)))
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else:
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raise ValueError('unrecognized family')
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def address_type(address):
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'''
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Return the types of the address
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This can be 'AF_INET', 'AF_UNIX', or 'AF_PIPE'
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'''
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if type(address) == tuple:
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return 'AF_INET'
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elif type(address) is str and address.startswith('\\\\'):
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return 'AF_PIPE'
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elif type(address) is str:
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return 'AF_UNIX'
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else:
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raise ValueError('address type of %r unrecognized' % address)
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class SentinelReady(Exception):
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"""
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Raised when a sentinel is ready when polling.
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"""
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def __init__(self, *args):
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Exception.__init__(self, *args)
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self.sentinels = args[0]
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#
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# Connection classes
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#
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class _ConnectionBase:
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_handle = None
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def __init__(self, handle, readable=True, writable=True):
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handle = handle.__index__()
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if handle < 0:
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raise ValueError("invalid handle")
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if not readable and not writable:
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raise ValueError(
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"at least one of `readable` and `writable` must be True")
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self._handle = handle
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self._readable = readable
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self._writable = writable
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# XXX should we use util.Finalize instead of a __del__?
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def __del__(self):
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if self._handle is not None:
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self._close()
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def _check_closed(self):
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if self._handle is None:
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raise IOError("handle is closed")
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def _check_readable(self):
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if not self._readable:
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raise IOError("connection is write-only")
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def _check_writable(self):
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if not self._writable:
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raise IOError("connection is read-only")
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def _bad_message_length(self):
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if self._writable:
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self._readable = False
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else:
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self.close()
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raise IOError("bad message length")
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@property
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def closed(self):
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"""True if the connection is closed"""
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return self._handle is None
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@property
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def readable(self):
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"""True if the connection is readable"""
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return self._readable
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@property
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def writable(self):
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"""True if the connection is writable"""
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return self._writable
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def fileno(self):
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"""File descriptor or handle of the connection"""
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self._check_closed()
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return self._handle
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def close(self):
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"""Close the connection"""
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if self._handle is not None:
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try:
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self._close()
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finally:
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self._handle = None
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def send_bytes(self, buf, offset=0, size=None):
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"""Send the bytes data from a bytes-like object"""
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self._check_closed()
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self._check_writable()
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m = memoryview(buf)
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# HACK for byte-indexing of non-bytewise buffers (e.g. array.array)
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if m.itemsize > 1:
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m = memoryview(bytes(m))
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n = len(m)
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if offset < 0:
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raise ValueError("offset is negative")
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if n < offset:
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raise ValueError("buffer length < offset")
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if size is None:
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size = n - offset
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elif size < 0:
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raise ValueError("size is negative")
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elif offset + size > n:
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raise ValueError("buffer length < offset + size")
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self._send_bytes(m[offset:offset + size])
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def send(self, obj):
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"""Send a (picklable) object"""
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self._check_closed()
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self._check_writable()
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buf = pickle.dumps(obj, protocol=pickle.HIGHEST_PROTOCOL)
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self._send_bytes(memoryview(buf))
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def recv_bytes(self, maxlength=None):
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"""
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Receive bytes data as a bytes object.
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"""
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self._check_closed()
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self._check_readable()
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if maxlength is not None and maxlength < 0:
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raise ValueError("negative maxlength")
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buf = self._recv_bytes(maxlength)
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if buf is None:
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self._bad_message_length()
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return buf.getvalue()
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def recv_bytes_into(self, buf, offset=0):
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"""
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Receive bytes data into a writeable buffer-like object.
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Return the number of bytes read.
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"""
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self._check_closed()
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self._check_readable()
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with memoryview(buf) as m:
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# Get bytesize of arbitrary buffer
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itemsize = m.itemsize
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bytesize = itemsize * len(m)
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if offset < 0:
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raise ValueError("negative offset")
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elif offset > bytesize:
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raise ValueError("offset too large")
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result = self._recv_bytes()
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size = result.tell()
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if bytesize < offset + size:
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raise BufferTooShort(result.getvalue())
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# Message can fit in dest
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result.seek(0)
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result.readinto(m[offset // itemsize :
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(offset + size) // itemsize])
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return size
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def recv(self, sentinels=None):
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"""Receive a (picklable) object"""
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self._check_closed()
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self._check_readable()
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buf = self._recv_bytes(sentinels=sentinels)
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return pickle.loads(buf.getbuffer())
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def poll(self, timeout=0.0):
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"""Whether there is any input available to be read"""
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self._check_closed()
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self._check_readable()
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return self._poll(timeout)
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if win32:
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class PipeConnection(_ConnectionBase):
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"""
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Connection class based on a Windows named pipe.
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Overlapped I/O is used, so the handles must have been created
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with FILE_FLAG_OVERLAPPED.
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"""
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_buffered = b''
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def _close(self, _CloseHandle=win32.CloseHandle):
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_CloseHandle(self._handle)
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def _send_bytes(self, buf):
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overlapped = win32.WriteFile(self._handle, buf, overlapped=True)
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nwritten, complete = overlapped.GetOverlappedResult(True)
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assert complete
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assert nwritten == len(buf)
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def _recv_bytes(self, maxsize=None, sentinels=()):
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if sentinels:
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self._poll(-1.0, sentinels)
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buf = io.BytesIO()
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firstchunk = self._buffered
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if firstchunk:
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lenfirstchunk = len(firstchunk)
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buf.write(firstchunk)
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self._buffered = b''
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else:
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# A reasonable size for the first chunk transfer
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bufsize = 128
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if maxsize is not None and maxsize < bufsize:
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bufsize = maxsize
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try:
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overlapped = win32.ReadFile(self._handle, bufsize, overlapped=True)
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lenfirstchunk, complete = overlapped.GetOverlappedResult(True)
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firstchunk = overlapped.getbuffer()
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assert lenfirstchunk == len(firstchunk)
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except IOError as e:
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if e.winerror == win32.ERROR_BROKEN_PIPE:
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raise EOFError
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raise
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buf.write(firstchunk)
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if complete:
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return buf
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navail, nleft = win32.PeekNamedPipe(self._handle)
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if maxsize is not None and lenfirstchunk + nleft > maxsize:
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return None
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if nleft > 0:
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overlapped = win32.ReadFile(self._handle, nleft, overlapped=True)
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res, complete = overlapped.GetOverlappedResult(True)
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assert res == nleft
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assert complete
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buf.write(overlapped.getbuffer())
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return buf
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def _poll(self, timeout, sentinels=()):
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# Fast non-blocking path
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navail, nleft = win32.PeekNamedPipe(self._handle)
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if navail > 0:
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return True
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elif timeout == 0.0:
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return False
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# Blocking: use overlapped I/O
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if timeout < 0.0:
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timeout = INFINITE
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else:
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timeout = int(timeout * 1000 + 0.5)
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overlapped = win32.ReadFile(self._handle, 1, overlapped=True)
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try:
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handles = [overlapped.event]
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handles += sentinels
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res = win32.WaitForMultipleObjects(handles, False, timeout)
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finally:
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# Always cancel overlapped I/O in the same thread
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# (because CancelIoEx() appears only in Vista)
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overlapped.cancel()
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if res == WAIT_TIMEOUT:
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return False
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idx = res - WAIT_OBJECT_0
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if idx == 0:
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# I/O was successful, store received data
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overlapped.GetOverlappedResult(True)
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self._buffered += overlapped.getbuffer()
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return True
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assert 0 < idx < len(handles)
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raise SentinelReady([handles[idx]])
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class Connection(_ConnectionBase):
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"""
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Connection class based on an arbitrary file descriptor (Unix only), or
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a socket handle (Windows).
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"""
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if win32:
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def _close(self, _close=win32.closesocket):
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_close(self._handle)
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_write = win32.send
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_read = win32.recv
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else:
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def _close(self, _close=os.close):
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_close(self._handle)
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_write = os.write
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_read = os.read
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def _send(self, buf, write=_write):
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remaining = len(buf)
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while True:
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n = write(self._handle, buf)
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remaining -= n
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if remaining == 0:
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break
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buf = buf[n:]
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def _recv(self, size, sentinels=(), read=_read):
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buf = io.BytesIO()
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handle = self._handle
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if sentinels:
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handles = [handle] + sentinels
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remaining = size
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while remaining > 0:
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if sentinels:
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r = _select(handles, [], [])[0]
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if handle not in r:
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raise SentinelReady(r)
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chunk = read(handle, remaining)
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n = len(chunk)
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if n == 0:
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if remaining == size:
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raise EOFError
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else:
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raise IOError("got end of file during message")
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buf.write(chunk)
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remaining -= n
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return buf
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def _send_bytes(self, buf):
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# For wire compatibility with 3.2 and lower
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n = len(buf)
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self._send(struct.pack("!i", n))
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# The condition is necessary to avoid "broken pipe" errors
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# when sending a 0-length buffer if the other end closed the pipe.
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if n > 0:
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self._send(buf)
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def _recv_bytes(self, maxsize=None, sentinels=()):
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buf = self._recv(4, sentinels)
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size, = struct.unpack("!i", buf.getvalue())
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if maxsize is not None and size > maxsize:
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return None
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return self._recv(size, sentinels)
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def _poll(self, timeout):
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if timeout < 0.0:
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timeout = None
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r = _select([self._handle], [], [], timeout)[0]
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return bool(r)
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#
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# Public functions
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#
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class Listener(object):
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'''
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Returns a listener object.
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This is a wrapper for a bound socket which is 'listening' for
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connections, or for a Windows named pipe.
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'''
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def __init__(self, address=None, family=None, backlog=1, authkey=None):
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family = family or (address and address_type(address)) \
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or default_family
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address = address or arbitrary_address(family)
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if family == 'AF_PIPE':
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self._listener = PipeListener(address, backlog)
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else:
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self._listener = SocketListener(address, family, backlog)
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if authkey is not None and not isinstance(authkey, bytes):
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raise TypeError('authkey should be a byte string')
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self._authkey = authkey
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def accept(self):
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'''
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Accept a connection on the bound socket or named pipe of `self`.
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Returns a `Connection` object.
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'''
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c = self._listener.accept()
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if self._authkey:
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deliver_challenge(c, self._authkey)
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answer_challenge(c, self._authkey)
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return c
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def close(self):
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'''
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Close the bound socket or named pipe of `self`.
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'''
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return self._listener.close()
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address = property(lambda self: self._listener._address)
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last_accepted = property(lambda self: self._listener._last_accepted)
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def Client(address, family=None, authkey=None):
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'''
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Returns a connection to the address of a `Listener`
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'''
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family = family or address_type(address)
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if family == 'AF_PIPE':
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c = PipeClient(address)
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else:
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c = SocketClient(address)
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if authkey is not None and not isinstance(authkey, bytes):
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raise TypeError('authkey should be a byte string')
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if authkey is not None:
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answer_challenge(c, authkey)
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deliver_challenge(c, authkey)
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return c
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if sys.platform != 'win32':
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def Pipe(duplex=True):
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'''
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Returns pair of connection objects at either end of a pipe
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'''
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if duplex:
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s1, s2 = socket.socketpair()
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c1 = Connection(s1.detach())
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c2 = Connection(s2.detach())
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else:
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fd1, fd2 = os.pipe()
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c1 = Connection(fd1, writable=False)
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c2 = Connection(fd2, readable=False)
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return c1, c2
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else:
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def Pipe(duplex=True):
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'''
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Returns pair of connection objects at either end of a pipe
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'''
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address = arbitrary_address('AF_PIPE')
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if duplex:
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openmode = win32.PIPE_ACCESS_DUPLEX
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access = win32.GENERIC_READ | win32.GENERIC_WRITE
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obsize, ibsize = BUFSIZE, BUFSIZE
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else:
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openmode = win32.PIPE_ACCESS_INBOUND
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access = win32.GENERIC_WRITE
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obsize, ibsize = 0, BUFSIZE
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h1 = win32.CreateNamedPipe(
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address, openmode | win32.FILE_FLAG_OVERLAPPED |
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win32.FILE_FLAG_FIRST_PIPE_INSTANCE,
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win32.PIPE_TYPE_MESSAGE | win32.PIPE_READMODE_MESSAGE |
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win32.PIPE_WAIT,
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1, obsize, ibsize, win32.NMPWAIT_WAIT_FOREVER, win32.NULL
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)
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h2 = win32.CreateFile(
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address, access, 0, win32.NULL, win32.OPEN_EXISTING,
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win32.FILE_FLAG_OVERLAPPED, win32.NULL
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)
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win32.SetNamedPipeHandleState(
|
|
h2, win32.PIPE_READMODE_MESSAGE, None, None
|
|
)
|
|
|
|
overlapped = win32.ConnectNamedPipe(h1, overlapped=True)
|
|
overlapped.GetOverlappedResult(True)
|
|
|
|
c1 = PipeConnection(h1, writable=duplex)
|
|
c2 = PipeConnection(h2, readable=duplex)
|
|
|
|
return c1, c2
|
|
|
|
#
|
|
# Definitions for connections based on sockets
|
|
#
|
|
|
|
class SocketListener(object):
|
|
'''
|
|
Representation of a socket which is bound to an address and listening
|
|
'''
|
|
def __init__(self, address, family, backlog=1):
|
|
self._socket = socket.socket(getattr(socket, family))
|
|
try:
|
|
# SO_REUSEADDR has different semantics on Windows (issue #2550).
|
|
if os.name == 'posix':
|
|
self._socket.setsockopt(socket.SOL_SOCKET,
|
|
socket.SO_REUSEADDR, 1)
|
|
self._socket.bind(address)
|
|
self._socket.listen(backlog)
|
|
self._address = self._socket.getsockname()
|
|
except OSError:
|
|
self._socket.close()
|
|
raise
|
|
self._family = family
|
|
self._last_accepted = None
|
|
|
|
if family == 'AF_UNIX':
|
|
self._unlink = Finalize(
|
|
self, os.unlink, args=(address,), exitpriority=0
|
|
)
|
|
else:
|
|
self._unlink = None
|
|
|
|
def accept(self):
|
|
s, self._last_accepted = self._socket.accept()
|
|
fd = duplicate(s.fileno())
|
|
conn = Connection(fd)
|
|
s.close()
|
|
return conn
|
|
|
|
def close(self):
|
|
self._socket.close()
|
|
if self._unlink is not None:
|
|
self._unlink()
|
|
|
|
|
|
def SocketClient(address):
|
|
'''
|
|
Return a connection object connected to the socket given by `address`
|
|
'''
|
|
family = address_type(address)
|
|
with socket.socket( getattr(socket, family) ) as s:
|
|
s.connect(address)
|
|
fd = duplicate(s.fileno())
|
|
conn = Connection(fd)
|
|
return conn
|
|
|
|
#
|
|
# Definitions for connections based on named pipes
|
|
#
|
|
|
|
if sys.platform == 'win32':
|
|
|
|
class PipeListener(object):
|
|
'''
|
|
Representation of a named pipe
|
|
'''
|
|
def __init__(self, address, backlog=None):
|
|
self._address = address
|
|
handle = win32.CreateNamedPipe(
|
|
address, win32.PIPE_ACCESS_DUPLEX |
|
|
win32.FILE_FLAG_FIRST_PIPE_INSTANCE,
|
|
win32.PIPE_TYPE_MESSAGE | win32.PIPE_READMODE_MESSAGE |
|
|
win32.PIPE_WAIT,
|
|
win32.PIPE_UNLIMITED_INSTANCES, BUFSIZE, BUFSIZE,
|
|
win32.NMPWAIT_WAIT_FOREVER, win32.NULL
|
|
)
|
|
self._handle_queue = [handle]
|
|
self._last_accepted = None
|
|
|
|
sub_debug('listener created with address=%r', self._address)
|
|
|
|
self.close = Finalize(
|
|
self, PipeListener._finalize_pipe_listener,
|
|
args=(self._handle_queue, self._address), exitpriority=0
|
|
)
|
|
|
|
def accept(self):
|
|
newhandle = win32.CreateNamedPipe(
|
|
self._address, win32.PIPE_ACCESS_DUPLEX,
|
|
win32.PIPE_TYPE_MESSAGE | win32.PIPE_READMODE_MESSAGE |
|
|
win32.PIPE_WAIT,
|
|
win32.PIPE_UNLIMITED_INSTANCES, BUFSIZE, BUFSIZE,
|
|
win32.NMPWAIT_WAIT_FOREVER, win32.NULL
|
|
)
|
|
self._handle_queue.append(newhandle)
|
|
handle = self._handle_queue.pop(0)
|
|
try:
|
|
win32.ConnectNamedPipe(handle, win32.NULL)
|
|
except WindowsError as e:
|
|
if e.winerror != win32.ERROR_PIPE_CONNECTED:
|
|
raise
|
|
return PipeConnection(handle)
|
|
|
|
@staticmethod
|
|
def _finalize_pipe_listener(queue, address):
|
|
sub_debug('closing listener with address=%r', address)
|
|
for handle in queue:
|
|
close(handle)
|
|
|
|
def PipeClient(address):
|
|
'''
|
|
Return a connection object connected to the pipe given by `address`
|
|
'''
|
|
t = _init_timeout()
|
|
while 1:
|
|
try:
|
|
win32.WaitNamedPipe(address, 1000)
|
|
h = win32.CreateFile(
|
|
address, win32.GENERIC_READ | win32.GENERIC_WRITE,
|
|
0, win32.NULL, win32.OPEN_EXISTING, 0, win32.NULL
|
|
)
|
|
except WindowsError as e:
|
|
if e.winerror not in (win32.ERROR_SEM_TIMEOUT,
|
|
win32.ERROR_PIPE_BUSY) or _check_timeout(t):
|
|
raise
|
|
else:
|
|
break
|
|
else:
|
|
raise
|
|
|
|
win32.SetNamedPipeHandleState(
|
|
h, win32.PIPE_READMODE_MESSAGE, None, None
|
|
)
|
|
return PipeConnection(h)
|
|
|
|
#
|
|
# Authentication stuff
|
|
#
|
|
|
|
MESSAGE_LENGTH = 20
|
|
|
|
CHALLENGE = b'#CHALLENGE#'
|
|
WELCOME = b'#WELCOME#'
|
|
FAILURE = b'#FAILURE#'
|
|
|
|
def deliver_challenge(connection, authkey):
|
|
import hmac
|
|
assert isinstance(authkey, bytes)
|
|
message = os.urandom(MESSAGE_LENGTH)
|
|
connection.send_bytes(CHALLENGE + message)
|
|
digest = hmac.new(authkey, message).digest()
|
|
response = connection.recv_bytes(256) # reject large message
|
|
if response == digest:
|
|
connection.send_bytes(WELCOME)
|
|
else:
|
|
connection.send_bytes(FAILURE)
|
|
raise AuthenticationError('digest received was wrong')
|
|
|
|
def answer_challenge(connection, authkey):
|
|
import hmac
|
|
assert isinstance(authkey, bytes)
|
|
message = connection.recv_bytes(256) # reject large message
|
|
assert message[:len(CHALLENGE)] == CHALLENGE, 'message = %r' % message
|
|
message = message[len(CHALLENGE):]
|
|
digest = hmac.new(authkey, message).digest()
|
|
connection.send_bytes(digest)
|
|
response = connection.recv_bytes(256) # reject large message
|
|
if response != WELCOME:
|
|
raise AuthenticationError('digest sent was rejected')
|
|
|
|
#
|
|
# Support for using xmlrpclib for serialization
|
|
#
|
|
|
|
class ConnectionWrapper(object):
|
|
def __init__(self, conn, dumps, loads):
|
|
self._conn = conn
|
|
self._dumps = dumps
|
|
self._loads = loads
|
|
for attr in ('fileno', 'close', 'poll', 'recv_bytes', 'send_bytes'):
|
|
obj = getattr(conn, attr)
|
|
setattr(self, attr, obj)
|
|
def send(self, obj):
|
|
s = self._dumps(obj)
|
|
self._conn.send_bytes(s)
|
|
def recv(self):
|
|
s = self._conn.recv_bytes()
|
|
return self._loads(s)
|
|
|
|
def _xml_dumps(obj):
|
|
return xmlrpclib.dumps((obj,), None, None, None, 1).encode('utf-8')
|
|
|
|
def _xml_loads(s):
|
|
(obj,), method = xmlrpclib.loads(s.decode('utf-8'))
|
|
return obj
|
|
|
|
class XmlListener(Listener):
|
|
def accept(self):
|
|
global xmlrpclib
|
|
import xmlrpc.client as xmlrpclib
|
|
obj = Listener.accept(self)
|
|
return ConnectionWrapper(obj, _xml_dumps, _xml_loads)
|
|
|
|
def XmlClient(*args, **kwds):
|
|
global xmlrpclib
|
|
import xmlrpc.client as xmlrpclib
|
|
return ConnectionWrapper(Client(*args, **kwds), _xml_dumps, _xml_loads)
|
|
|
|
|
|
# Late import because of circular import
|
|
from multiprocessing.forking import duplicate, close
|