101 lines
2.8 KiB
Python
101 lines
2.8 KiB
Python
# Copyright (C) 2003-2009 Robey Pointer <robeypointer@gmail.com>
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#
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# This file is part of paramiko.
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#
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# Paramiko is free software; you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation; either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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"""
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...
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"""
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import threading, socket
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from paramiko.common import asbytes
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class LoopSocket (object):
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"""
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A LoopSocket looks like a normal socket, but all data written to it is
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delivered on the read-end of another LoopSocket, and vice versa. It's
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like a software "socketpair".
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"""
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def __init__(self):
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self.__in_buffer = bytes()
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self.__lock = threading.Lock()
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self.__cv = threading.Condition(self.__lock)
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self.__timeout = None
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self.__mate = None
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def close(self):
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self.__unlink()
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try:
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self.__lock.acquire()
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self.__in_buffer = bytes()
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finally:
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self.__lock.release()
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def send(self, data):
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data = asbytes(data)
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if self.__mate is None:
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# EOF
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raise EOFError()
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self.__mate.__feed(data)
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return len(data)
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def recv(self, n):
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self.__lock.acquire()
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try:
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if self.__mate is None:
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# EOF
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return bytes()
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if len(self.__in_buffer) == 0:
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self.__cv.wait(self.__timeout)
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if len(self.__in_buffer) == 0:
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raise socket.timeout
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out = self.__in_buffer[:n]
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self.__in_buffer = self.__in_buffer[n:]
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return out
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finally:
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self.__lock.release()
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def settimeout(self, n):
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self.__timeout = n
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def link(self, other):
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self.__mate = other
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self.__mate.__mate = self
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def __feed(self, data):
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self.__lock.acquire()
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try:
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self.__in_buffer += data
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self.__cv.notifyAll()
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finally:
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self.__lock.release()
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def __unlink(self):
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m = None
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self.__lock.acquire()
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try:
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if self.__mate is not None:
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m = self.__mate
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self.__mate = None
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finally:
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self.__lock.release()
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if m is not None:
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m.__unlink()
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