mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-16 01:50:39 +00:00
149 lines
3.8 KiB
Python
149 lines
3.8 KiB
Python
# Copyright (C) 2003-2007 Robey Pointer <robeypointer@gmail.com>
|
|
#
|
|
# This file is part of paramiko.
|
|
#
|
|
# Paramiko is free software; you can redistribute it and/or modify it under the
|
|
# terms of the GNU Lesser General Public License as published by the Free
|
|
# Software Foundation; either version 2.1 of the License, or (at your option)
|
|
# any later version.
|
|
#
|
|
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
|
|
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
|
|
# details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public License
|
|
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
|
|
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
|
|
|
"""
|
|
Abstraction of a one-way pipe where the read end can be used in
|
|
`select.select`. Normally this is trivial, but Windows makes it nearly
|
|
impossible.
|
|
|
|
The pipe acts like an Event, which can be set or cleared. When set, the pipe
|
|
will trigger as readable in `select <select.select>`.
|
|
"""
|
|
|
|
import sys
|
|
import os
|
|
import socket
|
|
|
|
|
|
def make_pipe():
|
|
if sys.platform[:3] != "win":
|
|
p = PosixPipe()
|
|
else:
|
|
p = WindowsPipe()
|
|
return p
|
|
|
|
|
|
class PosixPipe(object):
|
|
def __init__(self):
|
|
self._rfd, self._wfd = os.pipe()
|
|
self._set = False
|
|
self._forever = False
|
|
self._closed = False
|
|
|
|
def close(self):
|
|
os.close(self._rfd)
|
|
os.close(self._wfd)
|
|
# used for unit tests:
|
|
self._closed = True
|
|
|
|
def fileno(self):
|
|
return self._rfd
|
|
|
|
def clear(self):
|
|
if not self._set or self._forever:
|
|
return
|
|
os.read(self._rfd, 1)
|
|
self._set = False
|
|
|
|
def set(self):
|
|
if self._set or self._closed:
|
|
return
|
|
self._set = True
|
|
os.write(self._wfd, b"*")
|
|
|
|
def set_forever(self):
|
|
self._forever = True
|
|
self.set()
|
|
|
|
|
|
class WindowsPipe(object):
|
|
"""
|
|
On Windows, only an OS-level "WinSock" may be used in select(), but reads
|
|
and writes must be to the actual socket object.
|
|
"""
|
|
|
|
def __init__(self):
|
|
serv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
|
serv.bind(("127.0.0.1", 0))
|
|
serv.listen(1)
|
|
|
|
# need to save sockets in _rsock/_wsock so they don't get closed
|
|
self._rsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
|
self._rsock.connect(("127.0.0.1", serv.getsockname()[1]))
|
|
|
|
self._wsock, addr = serv.accept()
|
|
serv.close()
|
|
self._set = False
|
|
self._forever = False
|
|
self._closed = False
|
|
|
|
def close(self):
|
|
self._rsock.close()
|
|
self._wsock.close()
|
|
# used for unit tests:
|
|
self._closed = True
|
|
|
|
def fileno(self):
|
|
return self._rsock.fileno()
|
|
|
|
def clear(self):
|
|
if not self._set or self._forever:
|
|
return
|
|
self._rsock.recv(1)
|
|
self._set = False
|
|
|
|
def set(self):
|
|
if self._set or self._closed:
|
|
return
|
|
self._set = True
|
|
self._wsock.send(b"*")
|
|
|
|
def set_forever(self):
|
|
self._forever = True
|
|
self.set()
|
|
|
|
|
|
class OrPipe(object):
|
|
def __init__(self, pipe):
|
|
self._set = False
|
|
self._partner = None
|
|
self._pipe = pipe
|
|
|
|
def set(self):
|
|
self._set = True
|
|
if not self._partner._set:
|
|
self._pipe.set()
|
|
|
|
def clear(self):
|
|
self._set = False
|
|
if not self._partner._set:
|
|
self._pipe.clear()
|
|
|
|
|
|
def make_or_pipe(pipe):
|
|
"""
|
|
wraps a pipe into two pipe-like objects which are "or"d together to
|
|
affect the real pipe. if either returned pipe is set, the wrapped pipe
|
|
is set. when both are cleared, the wrapped pipe is cleared.
|
|
"""
|
|
p1 = OrPipe(pipe)
|
|
p2 = OrPipe(pipe)
|
|
p1._partner = p2
|
|
p2._partner = p1
|
|
return p1, p2
|