122 lines
2.9 KiB
Python
122 lines
2.9 KiB
Python
#
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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#
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import sys
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try:
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set = set
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except NameError:
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from sets import Set as set
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try:
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from socket import SHUT_RDWR
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except ImportError:
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SHUT_RDWR = 2
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try:
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from traceback import format_exc
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except ImportError:
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import traceback
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def format_exc():
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return "".join(traceback.format_exception(*sys.exc_info()))
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if tuple(sys.version_info[0:2]) < (2, 4):
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from select import select as old_select
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def select(rlist, wlist, xlist, timeout=None):
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return old_select(list(rlist), list(wlist), list(xlist), timeout)
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else:
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from select import select
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class BaseWaiter:
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def wakeup(self):
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self._do_write()
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def wait(self, timeout=None):
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if timeout is not None:
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ready, _, _ = select([self], [], [], timeout)
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else:
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ready = True
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if ready:
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self._do_read()
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return True
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else:
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return False
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def reading(self):
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return True
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def readable(self):
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self._do_read()
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if sys.platform in ('win32', 'cygwin'):
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import socket
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class SockWaiter(BaseWaiter):
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def __init__(self, read_sock, write_sock):
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self.read_sock = read_sock
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self.write_sock = write_sock
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def _do_write(self):
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self.write_sock.send("\0")
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def _do_read(self):
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self.read_sock.recv(65536)
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def fileno(self):
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return self.read_sock.fileno()
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def __repr__(self):
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return "SockWaiter(%r, %r)" % (self.read_sock, self.write_sock)
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def selectable_waiter():
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listener = socket.socket()
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listener.bind(('', 0))
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listener.listen(1)
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_, port = listener.getsockname()
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write_sock = socket.socket()
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write_sock.connect(("127.0.0.1", port))
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read_sock, _ = listener.accept()
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listener.close()
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return SockWaiter(read_sock, write_sock)
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else:
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import os
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class PipeWaiter(BaseWaiter):
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def __init__(self, read_fd, write_fd):
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self.read_fd = read_fd
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self.write_fd = write_fd
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def _do_write(self):
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os.write(self.write_fd, "\0")
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def _do_read(self):
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os.read(self.read_fd, 65536)
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def fileno(self):
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return self.read_fd
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def __repr__(self):
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return "PipeWaiter(%r, %r)" % (self.read_fd, self.write_fd)
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def selectable_waiter():
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return PipeWaiter(*os.pipe())
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