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opt
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imh-python
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lib
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python3.9
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site-packages
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pexpect
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Filename :
socket_pexpect.py
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"""This is like :mod:`pexpect`, but it will work with any socket that you pass it. You are responsible for opening and closing the socket. PEXPECT LICENSE This license is approved by the OSI and FSF as GPL-compatible. http://opensource.org/licenses/isc-license.txt Copyright (c) 2012, Noah Spurrier <noah@noah.org> PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. """ import socket from contextlib import contextmanager from .exceptions import TIMEOUT, EOF from .spawnbase import SpawnBase __all__ = ["SocketSpawn"] class SocketSpawn(SpawnBase): """This is like :mod:`pexpect.fdpexpect` but uses the cross-platform python socket api, rather than the unix-specific file descriptor api. Thus, it works with remote connections on both unix and windows.""" def __init__( self, socket: socket.socket, args=None, timeout=30, maxread=2000, searchwindowsize=None, logfile=None, encoding=None, codec_errors="strict", use_poll=False, ): """This takes an open socket.""" self.args = None self.command = None SpawnBase.__init__( self, timeout, maxread, searchwindowsize, logfile, encoding=encoding, codec_errors=codec_errors, ) self.socket = socket self.child_fd = socket.fileno() self.closed = False self.name = "<socket %s>" % socket self.use_poll = use_poll def close(self): """Close the socket. Calling this method a second time does nothing, but if the file descriptor was closed elsewhere, :class:`OSError` will be raised. """ if self.child_fd == -1: return self.flush() self.socket.shutdown(socket.SHUT_RDWR) self.socket.close() self.child_fd = -1 self.closed = True def isalive(self): """ Alive if the fileno is valid """ return self.socket.fileno() >= 0 def send(self, s) -> int: """Write to socket, return number of bytes written""" s = self._coerce_send_string(s) self._log(s, "send") b = self._encoder.encode(s, final=False) self.socket.sendall(b) return len(b) def sendline(self, s) -> int: """Write to socket with trailing newline, return number of bytes written""" s = self._coerce_send_string(s) return self.send(s + self.linesep) def write(self, s): """Write to socket, return None""" self.send(s) def writelines(self, sequence): "Call self.write() for each item in sequence" for s in sequence: self.write(s) @contextmanager def _timeout(self, timeout): saved_timeout = self.socket.gettimeout() try: self.socket.settimeout(timeout) yield finally: self.socket.settimeout(saved_timeout) def read_nonblocking(self, size=1, timeout=-1): """ Read from the file descriptor and return the result as a string. The read_nonblocking method of :class:`SpawnBase` assumes that a call to os.read will not block (timeout parameter is ignored). This is not the case for POSIX file-like objects such as sockets and serial ports. Use :func:`select.select`, timeout is implemented conditionally for POSIX systems. :param int size: Read at most *size* bytes. :param int timeout: Wait timeout seconds for file descriptor to be ready to read. When -1 (default), use self.timeout. When 0, poll. :return: String containing the bytes read """ if timeout == -1: timeout = self.timeout try: with self._timeout(timeout): s = self.socket.recv(size) if s == b'': self.flag_eof = True raise EOF("Socket closed") return s except socket.timeout: raise TIMEOUT("Timeout exceeded.")