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78532baeab
svn+ssh://pythondev@svn.python.org/python/trunk ........ r70873 | josiah.carlson | 2009-03-31 15:32:34 -0400 (Tue, 31 Mar 2009) | 2 lines This resolves issue 1161031. Tests pass. ........ r70904 | josiah.carlson | 2009-03-31 17:49:36 -0400 (Tue, 31 Mar 2009) | 3 lines Made handle_expt_event() be called last, so that we don't accidentally read after closing the socket. ........ r70934 | josiah.carlson | 2009-03-31 21:28:11 -0400 (Tue, 31 Mar 2009) | 2 lines Fix for failing asyncore tests. ........ r71490 | r.david.murray | 2009-04-11 13:52:56 -0400 (Sat, 11 Apr 2009) | 4 lines Make test_asyncore tests match code changes introduced by the fix to Issue1161031, refactoring the test to simplify it in the process. ........
618 lines
19 KiB
Python
618 lines
19 KiB
Python
# -*- Mode: Python -*-
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# Id: asyncore.py,v 2.51 2000/09/07 22:29:26 rushing Exp
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# Author: Sam Rushing <rushing@nightmare.com>
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# ======================================================================
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# Copyright 1996 by Sam Rushing
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#
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# All Rights Reserved
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#
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# Permission to use, copy, modify, and distribute this software and
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# its documentation for any purpose and without fee is hereby
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# granted, provided that the above copyright notice appear in all
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# copies and that both that copyright notice and this permission
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# notice appear in supporting documentation, and that the name of Sam
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# Rushing not be used in advertising or publicity pertaining to
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# distribution of the software without specific, written prior
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# permission.
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#
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# SAM RUSHING DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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# INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
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# NO EVENT SHALL SAM RUSHING BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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# ======================================================================
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"""Basic infrastructure for asynchronous socket service clients and servers.
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There are only two ways to have a program on a single processor do "more
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than one thing at a time". Multi-threaded programming is the simplest and
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most popular way to do it, but there is another very different technique,
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that lets you have nearly all the advantages of multi-threading, without
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actually using multiple threads. it's really only practical if your program
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is largely I/O bound. If your program is CPU bound, then pre-emptive
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scheduled threads are probably what you really need. Network servers are
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rarely CPU-bound, however.
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If your operating system supports the select() system call in its I/O
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library (and nearly all do), then you can use it to juggle multiple
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communication channels at once; doing other work while your I/O is taking
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place in the "background." Although this strategy can seem strange and
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complex, especially at first, it is in many ways easier to understand and
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control than multi-threaded programming. The module documented here solves
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many of the difficult problems for you, making the task of building
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sophisticated high-performance network servers and clients a snap.
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"""
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import select
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import socket
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import sys
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import time
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import os
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from errno import EALREADY, EINPROGRESS, EWOULDBLOCK, ECONNRESET, \
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ENOTCONN, ESHUTDOWN, EINTR, EISCONN, EBADF, ECONNABORTED, errorcode
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try:
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socket_map
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except NameError:
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socket_map = {}
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def _strerror(err):
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res = os.strerror(err)
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if res == 'Unknown error':
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res = errorcode[err]
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return res
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class ExitNow(Exception):
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pass
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_reraised_exceptions = (ExitNow, KeyboardInterrupt, SystemExit)
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def read(obj):
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try:
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obj.handle_read_event()
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except _reraised_exceptions:
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raise
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except:
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obj.handle_error()
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def write(obj):
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try:
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obj.handle_write_event()
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except _reraised_exceptions:
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raise
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except:
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obj.handle_error()
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def _exception(obj):
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try:
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obj.handle_expt_event()
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except _reraised_exceptions:
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raise
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except:
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obj.handle_error()
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def readwrite(obj, flags):
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try:
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if flags & select.POLLIN:
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obj.handle_read_event()
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if flags & select.POLLOUT:
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obj.handle_write_event()
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if flags & (select.POLLHUP | select.POLLERR | select.POLLNVAL):
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obj.handle_close()
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if flags & select.POLLPRI:
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obj.handle_expt_event()
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except _reraised_exceptions:
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raise
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except:
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obj.handle_error()
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def poll(timeout=0.0, map=None):
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if map is None:
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map = socket_map
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if map:
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r = []; w = []; e = []
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for fd, obj in list(map.items()):
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is_r = obj.readable()
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is_w = obj.writable()
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if is_r:
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r.append(fd)
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if is_w:
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w.append(fd)
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if is_r or is_w:
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e.append(fd)
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if [] == r == w == e:
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time.sleep(timeout)
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return
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try:
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r, w, e = select.select(r, w, e, timeout)
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except select.error as err:
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if err.args[0] != EINTR:
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raise
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else:
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return
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for fd in r:
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obj = map.get(fd)
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if obj is None:
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continue
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read(obj)
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for fd in w:
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obj = map.get(fd)
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if obj is None:
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continue
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write(obj)
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for fd in e:
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obj = map.get(fd)
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if obj is None:
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continue
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_exception(obj)
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def poll2(timeout=0.0, map=None):
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# Use the poll() support added to the select module in Python 2.0
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if map is None:
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map = socket_map
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if timeout is not None:
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# timeout is in milliseconds
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timeout = int(timeout*1000)
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pollster = select.poll()
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if map:
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for fd, obj in list(map.items()):
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flags = 0
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if obj.readable():
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flags |= select.POLLIN | select.POLLPRI
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if obj.writable():
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flags |= select.POLLOUT
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if flags:
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# Only check for exceptions if object was either readable
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# or writable.
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flags |= select.POLLERR | select.POLLHUP | select.POLLNVAL
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pollster.register(fd, flags)
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try:
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r = pollster.poll(timeout)
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except select.error as err:
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if err.args[0] != EINTR:
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raise
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r = []
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for fd, flags in r:
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obj = map.get(fd)
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if obj is None:
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continue
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readwrite(obj, flags)
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poll3 = poll2 # Alias for backward compatibility
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def loop(timeout=30.0, use_poll=False, map=None, count=None):
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if map is None:
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map = socket_map
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if use_poll and hasattr(select, 'poll'):
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poll_fun = poll2
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else:
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poll_fun = poll
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if count is None:
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while map:
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poll_fun(timeout, map)
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else:
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while map and count > 0:
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poll_fun(timeout, map)
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count = count - 1
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class dispatcher:
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debug = False
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connected = False
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accepting = False
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closing = False
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addr = None
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ignore_log_types = frozenset(['warning'])
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def __init__(self, sock=None, map=None):
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if map is None:
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self._map = socket_map
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else:
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self._map = map
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self._fileno = None
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if sock:
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# Set to nonblocking just to make sure for cases where we
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# get a socket from a blocking source.
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sock.setblocking(0)
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self.set_socket(sock, map)
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self.connected = True
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# The constructor no longer requires that the socket
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# passed be connected.
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try:
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self.addr = sock.getpeername()
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except socket.error as err:
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if err.args[0] == ENOTCONN:
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# To handle the case where we got an unconnected
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# socket.
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self.connected = False
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else:
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# The socket is broken in some unknown way, alert
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# the user and remove it from the map (to prevent
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# polling of broken sockets).
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self.del_channel(map)
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raise
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else:
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self.socket = None
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def __repr__(self):
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status = [self.__class__.__module__+"."+self.__class__.__name__]
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if self.accepting and self.addr:
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status.append('listening')
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elif self.connected:
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status.append('connected')
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if self.addr is not None:
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try:
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status.append('%s:%d' % self.addr)
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except TypeError:
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status.append(repr(self.addr))
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return '<%s at %#x>' % (' '.join(status), id(self))
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def add_channel(self, map=None):
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#self.log_info('adding channel %s' % self)
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if map is None:
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map = self._map
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map[self._fileno] = self
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def del_channel(self, map=None):
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fd = self._fileno
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if map is None:
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map = self._map
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if fd in map:
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#self.log_info('closing channel %d:%s' % (fd, self))
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del map[fd]
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self._fileno = None
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def create_socket(self, family, type):
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self.family_and_type = family, type
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sock = socket.socket(family, type)
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sock.setblocking(0)
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self.set_socket(sock)
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def set_socket(self, sock, map=None):
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self.socket = sock
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## self.__dict__['socket'] = sock
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self._fileno = sock.fileno()
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self.add_channel(map)
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def set_reuse_addr(self):
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# try to re-use a server port if possible
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try:
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self.socket.setsockopt(
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socket.SOL_SOCKET, socket.SO_REUSEADDR,
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self.socket.getsockopt(socket.SOL_SOCKET,
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socket.SO_REUSEADDR) | 1
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)
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except socket.error:
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pass
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# ==================================================
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# predicates for select()
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# these are used as filters for the lists of sockets
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# to pass to select().
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# ==================================================
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def readable(self):
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return True
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def writable(self):
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return True
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# ==================================================
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# socket object methods.
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# ==================================================
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def listen(self, num):
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self.accepting = True
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if os.name == 'nt' and num > 5:
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num = 5
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return self.socket.listen(num)
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def bind(self, addr):
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self.addr = addr
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return self.socket.bind(addr)
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def connect(self, address):
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self.connected = False
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err = self.socket.connect_ex(address)
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# XXX Should interpret Winsock return values
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if err in (EINPROGRESS, EALREADY, EWOULDBLOCK):
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return
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if err in (0, EISCONN):
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self.addr = address
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self.handle_connect_event()
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else:
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raise socket.error(err, errorcode[err])
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def accept(self):
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# XXX can return either an address pair or None
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try:
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conn, addr = self.socket.accept()
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return conn, addr
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except socket.error as why:
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if why.args[0] == EWOULDBLOCK:
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pass
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else:
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raise
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def send(self, data):
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try:
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result = self.socket.send(data)
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return result
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except socket.error as why:
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if why.args[0] == EWOULDBLOCK:
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return 0
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elif why.args[0] in (ECONNRESET, ENOTCONN, ESHUTDOWN, ECONNABORTED):
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self.handle_close()
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return 0
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else:
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raise
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def recv(self, buffer_size):
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try:
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data = self.socket.recv(buffer_size)
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if not data:
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# a closed connection is indicated by signaling
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# a read condition, and having recv() return 0.
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self.handle_close()
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return b''
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else:
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return data
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except socket.error as why:
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# winsock sometimes throws ENOTCONN
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if why.args[0] in [ECONNRESET, ENOTCONN, ESHUTDOWN, ECONNABORTED]:
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self.handle_close()
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return b''
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else:
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raise
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def close(self):
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self.connected = False
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self.accepting = False
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self.del_channel()
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try:
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self.socket.close()
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except socket.error as why:
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if why.args[0] not in (ENOTCONN, EBADF):
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raise
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# cheap inheritance, used to pass all other attribute
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# references to the underlying socket object.
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def __getattr__(self, attr):
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return getattr(self.socket, attr)
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# log and log_info may be overridden to provide more sophisticated
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# logging and warning methods. In general, log is for 'hit' logging
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# and 'log_info' is for informational, warning and error logging.
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def log(self, message):
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sys.stderr.write('log: %s\n' % str(message))
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def log_info(self, message, type='info'):
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if type not in self.ignore_log_types:
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print('%s: %s' % (type, message))
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def handle_read_event(self):
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if self.accepting:
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# accepting sockets are never connected, they "spawn" new
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# sockets that are connected
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self.handle_accept()
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elif not self.connected:
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self.handle_connect_event()
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self.handle_read()
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else:
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self.handle_read()
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def handle_connect_event(self):
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self.connected = True
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self.handle_connect()
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def handle_write_event(self):
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if self.accepting:
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# Accepting sockets shouldn't get a write event.
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# We will pretend it didn't happen.
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return
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if not self.connected:
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#check for errors
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err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
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if err != 0:
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raise socket.error(err, _strerror(err))
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self.handle_connect_event()
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self.handle_write()
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def handle_expt_event(self):
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# handle_expt_event() is called if there might be an error on the
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# socket, or if there is OOB data
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# check for the error condition first
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err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
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if err != 0:
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# we can get here when select.select() says that there is an
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# exceptional condition on the socket
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# since there is an error, we'll go ahead and close the socket
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# like we would in a subclassed handle_read() that received no
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# data
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self.handle_close()
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else:
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self.handle_expt()
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def handle_error(self):
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nil, t, v, tbinfo = compact_traceback()
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# sometimes a user repr method will crash.
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try:
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self_repr = repr(self)
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except:
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self_repr = '<__repr__(self) failed for object at %0x>' % id(self)
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self.log_info(
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'uncaptured python exception, closing channel %s (%s:%s %s)' % (
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self_repr,
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t,
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v,
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tbinfo
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),
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'error'
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)
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self.handle_close()
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def handle_expt(self):
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self.log_info('unhandled incoming priority event', 'warning')
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def handle_read(self):
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self.log_info('unhandled read event', 'warning')
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def handle_write(self):
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self.log_info('unhandled write event', 'warning')
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def handle_connect(self):
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self.log_info('unhandled connect event', 'warning')
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def handle_accept(self):
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self.log_info('unhandled accept event', 'warning')
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def handle_close(self):
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self.log_info('unhandled close event', 'warning')
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self.close()
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# ---------------------------------------------------------------------------
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# adds simple buffered output capability, useful for simple clients.
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# [for more sophisticated usage use asynchat.async_chat]
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# ---------------------------------------------------------------------------
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class dispatcher_with_send(dispatcher):
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def __init__(self, sock=None, map=None):
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dispatcher.__init__(self, sock, map)
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self.out_buffer = b''
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def initiate_send(self):
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num_sent = 0
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num_sent = dispatcher.send(self, self.out_buffer[:512])
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self.out_buffer = self.out_buffer[num_sent:]
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def handle_write(self):
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self.initiate_send()
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def writable(self):
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return (not self.connected) or len(self.out_buffer)
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def send(self, data):
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if self.debug:
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self.log_info('sending %s' % repr(data))
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self.out_buffer = self.out_buffer + data
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self.initiate_send()
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# ---------------------------------------------------------------------------
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# used for debugging.
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# ---------------------------------------------------------------------------
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def compact_traceback():
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t, v, tb = sys.exc_info()
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tbinfo = []
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if not tb: # Must have a traceback
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raise AssertionError("traceback does not exist")
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while tb:
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tbinfo.append((
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tb.tb_frame.f_code.co_filename,
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tb.tb_frame.f_code.co_name,
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str(tb.tb_lineno)
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))
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tb = tb.tb_next
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# just to be safe
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del tb
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file, function, line = tbinfo[-1]
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info = ' '.join(['[%s|%s|%s]' % x for x in tbinfo])
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return (file, function, line), t, v, info
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def close_all(map=None, ignore_all=False):
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if map is None:
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map = socket_map
|
|
for x in list(map.values()):
|
|
try:
|
|
x.close()
|
|
except OSError as x:
|
|
if x.args[0] == EBADF:
|
|
pass
|
|
elif not ignore_all:
|
|
raise
|
|
except _reraised_exceptions:
|
|
raise
|
|
except:
|
|
if not ignore_all:
|
|
raise
|
|
map.clear()
|
|
|
|
# Asynchronous File I/O:
|
|
#
|
|
# After a little research (reading man pages on various unixen, and
|
|
# digging through the linux kernel), I've determined that select()
|
|
# isn't meant for doing asynchronous file i/o.
|
|
# Heartening, though - reading linux/mm/filemap.c shows that linux
|
|
# supports asynchronous read-ahead. So _MOST_ of the time, the data
|
|
# will be sitting in memory for us already when we go to read it.
|
|
#
|
|
# What other OS's (besides NT) support async file i/o? [VMS?]
|
|
#
|
|
# Regardless, this is useful for pipes, and stdin/stdout...
|
|
|
|
if os.name == 'posix':
|
|
import fcntl
|
|
|
|
class file_wrapper:
|
|
# Here we override just enough to make a file
|
|
# look like a socket for the purposes of asyncore.
|
|
# The passed fd is automatically os.dup()'d
|
|
|
|
def __init__(self, fd):
|
|
self.fd = os.dup(fd)
|
|
|
|
def recv(self, *args):
|
|
return os.read(self.fd, *args)
|
|
|
|
def send(self, *args):
|
|
return os.write(self.fd, *args)
|
|
|
|
read = recv
|
|
write = send
|
|
|
|
def close(self):
|
|
os.close(self.fd)
|
|
|
|
def fileno(self):
|
|
return self.fd
|
|
|
|
class file_dispatcher(dispatcher):
|
|
|
|
def __init__(self, fd, map=None):
|
|
dispatcher.__init__(self, None, map)
|
|
self.connected = True
|
|
try:
|
|
fd = fd.fileno()
|
|
except AttributeError:
|
|
pass
|
|
self.set_file(fd)
|
|
# set it to non-blocking mode
|
|
flags = fcntl.fcntl(fd, fcntl.F_GETFL, 0)
|
|
flags = flags | os.O_NONBLOCK
|
|
fcntl.fcntl(fd, fcntl.F_SETFL, flags)
|
|
|
|
def set_file(self, fd):
|
|
self.socket = file_wrapper(fd)
|
|
self._fileno = self.socket.fileno()
|
|
self.add_channel()
|