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153 lines
5.9 KiB
Python
153 lines
5.9 KiB
Python
'''This is like :mod:`pexpect`, but it will work with any file descriptor that you
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pass it. You are responsible for opening and close the file descriptor.
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This allows you to use Pexpect with sockets and named pipes (FIFOs).
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.. note::
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socket.fileno() does not give a readable file descriptor on windows.
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Use :mod:`pexpect.socket_pexpect` for cross-platform socket support
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PEXPECT LICENSE
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This license is approved by the OSI and FSF as GPL-compatible.
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http://opensource.org/licenses/isc-license.txt
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Copyright (c) 2012, Noah Spurrier <noah@noah.org>
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PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY
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PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE
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COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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'''
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from .spawnbase import SpawnBase
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from .exceptions import ExceptionPexpect, TIMEOUT
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from .utils import select_ignore_interrupts, poll_ignore_interrupts
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import os
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__all__ = ['fdspawn']
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class fdspawn(SpawnBase):
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'''This is like pexpect.spawn but allows you to supply your own open file
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descriptor. For example, you could use it to read through a file looking
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for patterns, or to control a modem or serial device. '''
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def __init__ (self, fd, args=None, timeout=30, maxread=2000, searchwindowsize=None,
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logfile=None, encoding=None, codec_errors='strict', use_poll=False):
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'''This takes a file descriptor (an int) or an object that support the
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fileno() method (returning an int). All Python file-like objects
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support fileno(). '''
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if type(fd) != type(0) and hasattr(fd, 'fileno'):
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fd = fd.fileno()
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if type(fd) != type(0):
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raise ExceptionPexpect('The fd argument is not an int. If this is a command string then maybe you want to use pexpect.spawn.')
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try: # make sure fd is a valid file descriptor
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os.fstat(fd)
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except OSError:
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raise ExceptionPexpect('The fd argument is not a valid file descriptor.')
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self.args = None
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self.command = None
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SpawnBase.__init__(self, timeout, maxread, searchwindowsize, logfile,
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encoding=encoding, codec_errors=codec_errors)
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self.child_fd = fd
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self.own_fd = False
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self.closed = False
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self.name = '<file descriptor %d>' % fd
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self.use_poll = use_poll
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def close (self):
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"""Close the file descriptor.
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Calling this method a second time does nothing, but if the file
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descriptor was closed elsewhere, :class:`OSError` will be raised.
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"""
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if self.child_fd == -1:
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return
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self.flush()
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os.close(self.child_fd)
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self.child_fd = -1
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self.closed = True
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def isalive (self):
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'''This checks if the file descriptor is still valid. If :func:`os.fstat`
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does not raise an exception then we assume it is alive. '''
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if self.child_fd == -1:
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return False
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try:
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os.fstat(self.child_fd)
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return True
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except:
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return False
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def terminate (self, force=False): # pragma: no cover
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'''Deprecated and invalid. Just raises an exception.'''
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raise ExceptionPexpect('This method is not valid for file descriptors.')
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# These four methods are left around for backwards compatibility, but not
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# documented as part of fdpexpect. You're encouraged to use os.write
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# directly.
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def send(self, s):
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"Write to fd, return number of bytes written"
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s = self._coerce_send_string(s)
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self._log(s, 'send')
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b = self._encoder.encode(s, final=False)
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return os.write(self.child_fd, b)
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def sendline(self, s):
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"Write to fd with trailing newline, return number of bytes written"
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s = self._coerce_send_string(s)
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return self.send(s + self.linesep)
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def write(self, s):
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"Write to fd, return None"
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self.send(s)
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def writelines(self, sequence):
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"Call self.write() for each item in sequence"
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for s in sequence:
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self.write(s)
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def read_nonblocking(self, size=1, timeout=-1):
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"""
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Read from the file descriptor and return the result as a string.
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The read_nonblocking method of :class:`SpawnBase` assumes that a call
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to os.read will not block (timeout parameter is ignored). This is not
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the case for POSIX file-like objects such as sockets and serial ports.
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Use :func:`select.select`, timeout is implemented conditionally for
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POSIX systems.
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:param int size: Read at most *size* bytes.
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:param int timeout: Wait timeout seconds for file descriptor to be
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ready to read. When -1 (default), use self.timeout. When 0, poll.
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:return: String containing the bytes read
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"""
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if os.name == 'posix':
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if timeout == -1:
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timeout = self.timeout
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rlist = [self.child_fd]
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wlist = []
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xlist = []
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if self.use_poll:
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rlist = poll_ignore_interrupts(rlist, timeout)
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else:
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rlist, wlist, xlist = select_ignore_interrupts(
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rlist, wlist, xlist, timeout
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)
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if self.child_fd not in rlist:
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raise TIMEOUT('Timeout exceeded.')
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return super(fdspawn, self).read_nonblocking(size)
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