956 lines
30 KiB
Python
956 lines
30 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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# Licensed to PSF under a Contributor Agreement.
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#
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__all__ = [ 'Client', 'Listener', 'Pipe', 'wait' ]
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import io
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import os
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import sys
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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 . import reduction
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from . import util
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from . import AuthenticationError, BufferTooShort
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from .reduction import ForkingPickler
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try:
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import _winapi
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from _winapi 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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_winapi = None
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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=util.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 _validate_family(family):
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'''
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Checks if the family is valid for the current environment.
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'''
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if sys.platform != 'win32' and family == 'AF_PIPE':
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raise ValueError('Family %s is not recognized.' % family)
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if sys.platform == 'win32' and family == 'AF_UNIX':
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# double check
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if not hasattr(socket, family):
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raise ValueError('Family %s is not recognized.' % 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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#
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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 OSError("handle is closed")
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def _check_readable(self):
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if not self._readable:
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raise OSError("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 OSError("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 OSError("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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self._send_bytes(ForkingPickler.dumps(obj))
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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):
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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()
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return ForkingPickler.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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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, exc_tb):
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self.close()
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if _winapi:
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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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_got_empty_message = False
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def _close(self, _CloseHandle=_winapi.CloseHandle):
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_CloseHandle(self._handle)
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def _send_bytes(self, buf):
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ov, err = _winapi.WriteFile(self._handle, buf, overlapped=True)
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try:
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if err == _winapi.ERROR_IO_PENDING:
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waitres = _winapi.WaitForMultipleObjects(
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[ov.event], False, INFINITE)
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assert waitres == WAIT_OBJECT_0
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except:
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ov.cancel()
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raise
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finally:
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nwritten, err = ov.GetOverlappedResult(True)
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assert err == 0
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assert nwritten == len(buf)
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def _recv_bytes(self, maxsize=None):
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if self._got_empty_message:
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self._got_empty_message = False
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return io.BytesIO()
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else:
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bsize = 128 if maxsize is None else min(maxsize, 128)
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try:
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ov, err = _winapi.ReadFile(self._handle, bsize,
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overlapped=True)
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try:
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if err == _winapi.ERROR_IO_PENDING:
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waitres = _winapi.WaitForMultipleObjects(
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[ov.event], False, INFINITE)
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assert waitres == WAIT_OBJECT_0
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except:
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ov.cancel()
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raise
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finally:
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nread, err = ov.GetOverlappedResult(True)
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if err == 0:
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f = io.BytesIO()
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f.write(ov.getbuffer())
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return f
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elif err == _winapi.ERROR_MORE_DATA:
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return self._get_more_data(ov, maxsize)
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except OSError as e:
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if e.winerror == _winapi.ERROR_BROKEN_PIPE:
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raise EOFError
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else:
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raise
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raise RuntimeError("shouldn't get here; expected KeyboardInterrupt")
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def _poll(self, timeout):
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if (self._got_empty_message or
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_winapi.PeekNamedPipe(self._handle)[0] != 0):
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return True
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return bool(wait([self], timeout))
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def _get_more_data(self, ov, maxsize):
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buf = ov.getbuffer()
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f = io.BytesIO()
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f.write(buf)
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left = _winapi.PeekNamedPipe(self._handle)[1]
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assert left > 0
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if maxsize is not None and len(buf) + left > maxsize:
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self._bad_message_length()
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ov, err = _winapi.ReadFile(self._handle, left, overlapped=True)
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rbytes, err = ov.GetOverlappedResult(True)
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assert err == 0
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assert rbytes == left
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f.write(ov.getbuffer())
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return f
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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 _winapi:
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def _close(self, _close=_multiprocessing.closesocket):
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_close(self._handle)
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_write = _multiprocessing.send
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_read = _multiprocessing.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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try:
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n = write(self._handle, buf)
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except InterruptedError:
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continue
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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, read=_read):
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buf = io.BytesIO()
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handle = self._handle
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remaining = size
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while remaining > 0:
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try:
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chunk = read(handle, remaining)
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except InterruptedError:
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continue
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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 OSError("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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n = len(buf)
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# For wire compatibility with 3.2 and lower
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header = struct.pack("!i", n)
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if n > 16384:
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# The payload is large so Nagle's algorithm won't be triggered
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# and we'd better avoid the cost of concatenation.
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chunks = [header, buf]
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elif n > 0:
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# Issue # 20540: concatenate before sending, to avoid delays due
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# to Nagle's algorithm on a TCP socket.
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chunks = [header + buf]
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else:
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# This code path 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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chunks = [header]
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for chunk in chunks:
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self._send(chunk)
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def _recv_bytes(self, maxsize=None):
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buf = self._recv(4)
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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)
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def _poll(self, timeout):
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r = wait([self], timeout)
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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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_validate_family(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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if self._listener is None:
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raise OSError('listener is closed')
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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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if self._listener is not None:
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self._listener.close()
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self._listener = None
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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 __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, exc_tb):
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self.close()
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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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_validate_family(family)
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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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s1.setblocking(True)
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s2.setblocking(True)
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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 = _winapi.PIPE_ACCESS_DUPLEX
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access = _winapi.GENERIC_READ | _winapi.GENERIC_WRITE
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obsize, ibsize = BUFSIZE, BUFSIZE
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else:
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openmode = _winapi.PIPE_ACCESS_INBOUND
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access = _winapi.GENERIC_WRITE
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obsize, ibsize = 0, BUFSIZE
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h1 = _winapi.CreateNamedPipe(
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address, openmode | _winapi.FILE_FLAG_OVERLAPPED |
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_winapi.FILE_FLAG_FIRST_PIPE_INSTANCE,
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_winapi.PIPE_TYPE_MESSAGE | _winapi.PIPE_READMODE_MESSAGE |
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_winapi.PIPE_WAIT,
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1, obsize, ibsize, _winapi.NMPWAIT_WAIT_FOREVER,
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# default security descriptor: the handle cannot be inherited
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_winapi.NULL
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)
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h2 = _winapi.CreateFile(
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address, access, 0, _winapi.NULL, _winapi.OPEN_EXISTING,
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_winapi.FILE_FLAG_OVERLAPPED, _winapi.NULL
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)
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_winapi.SetNamedPipeHandleState(
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h2, _winapi.PIPE_READMODE_MESSAGE, None, None
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)
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overlapped = _winapi.ConnectNamedPipe(h1, overlapped=True)
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_, err = overlapped.GetOverlappedResult(True)
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assert err == 0
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c1 = PipeConnection(h1, writable=duplex)
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c2 = PipeConnection(h2, readable=duplex)
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return c1, c2
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#
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# Definitions for connections based on sockets
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||
#
|
||
|
||
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.setblocking(True)
|
||
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 = util.Finalize(
|
||
self, os.unlink, args=(address,), exitpriority=0
|
||
)
|
||
else:
|
||
self._unlink = None
|
||
|
||
def accept(self):
|
||
while True:
|
||
try:
|
||
s, self._last_accepted = self._socket.accept()
|
||
except InterruptedError:
|
||
pass
|
||
else:
|
||
break
|
||
s.setblocking(True)
|
||
return Connection(s.detach())
|
||
|
||
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.setblocking(True)
|
||
s.connect(address)
|
||
return Connection(s.detach())
|
||
|
||
#
|
||
# 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
|
||
self._handle_queue = [self._new_handle(first=True)]
|
||
|
||
self._last_accepted = None
|
||
util.sub_debug('listener created with address=%r', self._address)
|
||
self.close = util.Finalize(
|
||
self, PipeListener._finalize_pipe_listener,
|
||
args=(self._handle_queue, self._address), exitpriority=0
|
||
)
|
||
|
||
def _new_handle(self, first=False):
|
||
flags = _winapi.PIPE_ACCESS_DUPLEX | _winapi.FILE_FLAG_OVERLAPPED
|
||
if first:
|
||
flags |= _winapi.FILE_FLAG_FIRST_PIPE_INSTANCE
|
||
return _winapi.CreateNamedPipe(
|
||
self._address, flags,
|
||
_winapi.PIPE_TYPE_MESSAGE | _winapi.PIPE_READMODE_MESSAGE |
|
||
_winapi.PIPE_WAIT,
|
||
_winapi.PIPE_UNLIMITED_INSTANCES, BUFSIZE, BUFSIZE,
|
||
_winapi.NMPWAIT_WAIT_FOREVER, _winapi.NULL
|
||
)
|
||
|
||
def accept(self):
|
||
self._handle_queue.append(self._new_handle())
|
||
handle = self._handle_queue.pop(0)
|
||
try:
|
||
ov = _winapi.ConnectNamedPipe(handle, overlapped=True)
|
||
except OSError as e:
|
||
if e.winerror != _winapi.ERROR_NO_DATA:
|
||
raise
|
||
# ERROR_NO_DATA can occur if a client has already connected,
|
||
# written data and then disconnected -- see Issue 14725.
|
||
else:
|
||
try:
|
||
res = _winapi.WaitForMultipleObjects(
|
||
[ov.event], False, INFINITE)
|
||
except:
|
||
ov.cancel()
|
||
_winapi.CloseHandle(handle)
|
||
raise
|
||
finally:
|
||
_, err = ov.GetOverlappedResult(True)
|
||
assert err == 0
|
||
return PipeConnection(handle)
|
||
|
||
@staticmethod
|
||
def _finalize_pipe_listener(queue, address):
|
||
util.sub_debug('closing listener with address=%r', address)
|
||
for handle in queue:
|
||
_winapi.CloseHandle(handle)
|
||
|
||
def PipeClient(address):
|
||
'''
|
||
Return a connection object connected to the pipe given by `address`
|
||
'''
|
||
t = _init_timeout()
|
||
while 1:
|
||
try:
|
||
_winapi.WaitNamedPipe(address, 1000)
|
||
h = _winapi.CreateFile(
|
||
address, _winapi.GENERIC_READ | _winapi.GENERIC_WRITE,
|
||
0, _winapi.NULL, _winapi.OPEN_EXISTING,
|
||
_winapi.FILE_FLAG_OVERLAPPED, _winapi.NULL
|
||
)
|
||
except OSError as e:
|
||
if e.winerror not in (_winapi.ERROR_SEM_TIMEOUT,
|
||
_winapi.ERROR_PIPE_BUSY) or _check_timeout(t):
|
||
raise
|
||
else:
|
||
break
|
||
else:
|
||
raise
|
||
|
||
_winapi.SetNamedPipeHandleState(
|
||
h, _winapi.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, 'md5').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, 'md5').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)
|
||
|
||
#
|
||
# Wait
|
||
#
|
||
|
||
if sys.platform == 'win32':
|
||
|
||
def _exhaustive_wait(handles, timeout):
|
||
# Return ALL handles which are currently signalled. (Only
|
||
# returning the first signalled might create starvation issues.)
|
||
L = list(handles)
|
||
ready = []
|
||
while L:
|
||
res = _winapi.WaitForMultipleObjects(L, False, timeout)
|
||
if res == WAIT_TIMEOUT:
|
||
break
|
||
elif WAIT_OBJECT_0 <= res < WAIT_OBJECT_0 + len(L):
|
||
res -= WAIT_OBJECT_0
|
||
elif WAIT_ABANDONED_0 <= res < WAIT_ABANDONED_0 + len(L):
|
||
res -= WAIT_ABANDONED_0
|
||
else:
|
||
raise RuntimeError('Should not get here')
|
||
ready.append(L[res])
|
||
L = L[res+1:]
|
||
timeout = 0
|
||
return ready
|
||
|
||
_ready_errors = {_winapi.ERROR_BROKEN_PIPE, _winapi.ERROR_NETNAME_DELETED}
|
||
|
||
def wait(object_list, timeout=None):
|
||
'''
|
||
Wait till an object in object_list is ready/readable.
|
||
|
||
Returns list of those objects in object_list which are ready/readable.
|
||
'''
|
||
if timeout is None:
|
||
timeout = INFINITE
|
||
elif timeout < 0:
|
||
timeout = 0
|
||
else:
|
||
timeout = int(timeout * 1000 + 0.5)
|
||
|
||
object_list = list(object_list)
|
||
waithandle_to_obj = {}
|
||
ov_list = []
|
||
ready_objects = set()
|
||
ready_handles = set()
|
||
|
||
try:
|
||
for o in object_list:
|
||
try:
|
||
fileno = getattr(o, 'fileno')
|
||
except AttributeError:
|
||
waithandle_to_obj[o.__index__()] = o
|
||
else:
|
||
# start an overlapped read of length zero
|
||
try:
|
||
ov, err = _winapi.ReadFile(fileno(), 0, True)
|
||
except OSError as e:
|
||
err = e.winerror
|
||
if err not in _ready_errors:
|
||
raise
|
||
if err == _winapi.ERROR_IO_PENDING:
|
||
ov_list.append(ov)
|
||
waithandle_to_obj[ov.event] = o
|
||
else:
|
||
# If o.fileno() is an overlapped pipe handle and
|
||
# err == 0 then there is a zero length message
|
||
# in the pipe, but it HAS NOT been consumed.
|
||
ready_objects.add(o)
|
||
timeout = 0
|
||
|
||
ready_handles = _exhaustive_wait(waithandle_to_obj.keys(), timeout)
|
||
finally:
|
||
# request that overlapped reads stop
|
||
for ov in ov_list:
|
||
ov.cancel()
|
||
|
||
# wait for all overlapped reads to stop
|
||
for ov in ov_list:
|
||
try:
|
||
_, err = ov.GetOverlappedResult(True)
|
||
except OSError as e:
|
||
err = e.winerror
|
||
if err not in _ready_errors:
|
||
raise
|
||
if err != _winapi.ERROR_OPERATION_ABORTED:
|
||
o = waithandle_to_obj[ov.event]
|
||
ready_objects.add(o)
|
||
if err == 0:
|
||
# If o.fileno() is an overlapped pipe handle then
|
||
# a zero length message HAS been consumed.
|
||
if hasattr(o, '_got_empty_message'):
|
||
o._got_empty_message = True
|
||
|
||
ready_objects.update(waithandle_to_obj[h] for h in ready_handles)
|
||
return [o for o in object_list if o in ready_objects]
|
||
|
||
else:
|
||
|
||
import selectors
|
||
|
||
# poll/select have the advantage of not requiring any extra file
|
||
# descriptor, contrarily to epoll/kqueue (also, they require a single
|
||
# syscall).
|
||
if hasattr(selectors, 'PollSelector'):
|
||
_WaitSelector = selectors.PollSelector
|
||
else:
|
||
_WaitSelector = selectors.SelectSelector
|
||
|
||
def wait(object_list, timeout=None):
|
||
'''
|
||
Wait till an object in object_list is ready/readable.
|
||
|
||
Returns list of those objects in object_list which are ready/readable.
|
||
'''
|
||
with _WaitSelector() as selector:
|
||
for obj in object_list:
|
||
selector.register(obj, selectors.EVENT_READ)
|
||
|
||
if timeout is not None:
|
||
deadline = time.time() + timeout
|
||
|
||
while True:
|
||
ready = selector.select(timeout)
|
||
if ready:
|
||
return [key.fileobj for (key, events) in ready]
|
||
else:
|
||
if timeout is not None:
|
||
timeout = deadline - time.time()
|
||
if timeout < 0:
|
||
return ready
|
||
|
||
#
|
||
# Make connection and socket objects sharable if possible
|
||
#
|
||
|
||
if sys.platform == 'win32':
|
||
def reduce_connection(conn):
|
||
handle = conn.fileno()
|
||
with socket.fromfd(handle, socket.AF_INET, socket.SOCK_STREAM) as s:
|
||
from . import resource_sharer
|
||
ds = resource_sharer.DupSocket(s)
|
||
return rebuild_connection, (ds, conn.readable, conn.writable)
|
||
def rebuild_connection(ds, readable, writable):
|
||
sock = ds.detach()
|
||
return Connection(sock.detach(), readable, writable)
|
||
reduction.register(Connection, reduce_connection)
|
||
|
||
def reduce_pipe_connection(conn):
|
||
access = ((_winapi.FILE_GENERIC_READ if conn.readable else 0) |
|
||
(_winapi.FILE_GENERIC_WRITE if conn.writable else 0))
|
||
dh = reduction.DupHandle(conn.fileno(), access)
|
||
return rebuild_pipe_connection, (dh, conn.readable, conn.writable)
|
||
def rebuild_pipe_connection(dh, readable, writable):
|
||
handle = dh.detach()
|
||
return PipeConnection(handle, readable, writable)
|
||
reduction.register(PipeConnection, reduce_pipe_connection)
|
||
|
||
else:
|
||
def reduce_connection(conn):
|
||
df = reduction.DupFd(conn.fileno())
|
||
return rebuild_connection, (df, conn.readable, conn.writable)
|
||
def rebuild_connection(df, readable, writable):
|
||
fd = df.detach()
|
||
return Connection(fd, readable, writable)
|
||
reduction.register(Connection, reduce_connection)
|