Viewing file:  npipesocket.py (5.59 KB) -rw-r--r--
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import functools
import time
import io
import win32file
import win32pipe
cERROR_PIPE_BUSY = 0xe7
cSECURITY_SQOS_PRESENT = 0x100000
cSECURITY_ANONYMOUS = 0
MAXIMUM_RETRY_COUNT = 10
def check_closed(f):
@functools.wraps(f)
def wrapped(self, *args, **kwargs):
if self._closed:
raise RuntimeError(
'Can not reuse socket after connection was closed.'
)
return f(self, *args, **kwargs)
return wrapped
class NpipeSocket:
""" Partial implementation of the socket API over windows named pipes.
This implementation is only designed to be used as a client socket,
and server-specific methods (bind, listen, accept...) are not
implemented.
"""
def __init__(self, handle=None):
self._timeout = win32pipe.NMPWAIT_USE_DEFAULT_WAIT
self._handle = handle
self._closed = False
def accept(self):
raise NotImplementedError()
def bind(self, address):
raise NotImplementedError()
def close(self):
self._handle.Close()
self._closed = True
@check_closed
def connect(self, address, retry_count=0):
try:
handle = win32file.CreateFile(
address,
win32file.GENERIC_READ | win32file.GENERIC_WRITE,
0,
None,
win32file.OPEN_EXISTING,
cSECURITY_ANONYMOUS | cSECURITY_SQOS_PRESENT,
0
)
except win32pipe.error as e:
# See Remarks:
# https://msdn.microsoft.com/en-us/library/aa365800.aspx
if e.winerror == cERROR_PIPE_BUSY:
# Another program or thread has grabbed our pipe instance
# before we got to it. Wait for availability and attempt to
# connect again.
retry_count = retry_count + 1
if (retry_count < MAXIMUM_RETRY_COUNT):
time.sleep(1)
return self.connect(address, retry_count)
raise e
self.flags = win32pipe.GetNamedPipeInfo(handle)[0]
self._handle = handle
self._address = address
@check_closed
def connect_ex(self, address):
return self.connect(address)
@check_closed
def detach(self):
self._closed = True
return self._handle
@check_closed
def dup(self):
return NpipeSocket(self._handle)
def getpeername(self):
return self._address
def getsockname(self):
return self._address
def getsockopt(self, level, optname, buflen=None):
raise NotImplementedError()
def ioctl(self, control, option):
raise NotImplementedError()
def listen(self, backlog):
raise NotImplementedError()
def makefile(self, mode=None, bufsize=None):
if mode.strip('b') != 'r':
raise NotImplementedError()
rawio = NpipeFileIOBase(self)
if bufsize is None or bufsize <= 0:
bufsize = io.DEFAULT_BUFFER_SIZE
return io.BufferedReader(rawio, buffer_size=bufsize)
@check_closed
def recv(self, bufsize, flags=0):
err, data = win32file.ReadFile(self._handle, bufsize)
return data
@check_closed
def recvfrom(self, bufsize, flags=0):
data = self.recv(bufsize, flags)
return (data, self._address)
@check_closed
def recvfrom_into(self, buf, nbytes=0, flags=0):
return self.recv_into(buf, nbytes, flags), self._address
@check_closed
def recv_into(self, buf, nbytes=0):
readbuf = buf
if not isinstance(buf, memoryview):
readbuf = memoryview(buf)
err, data = win32file.ReadFile(
self._handle,
readbuf[:nbytes] if nbytes else readbuf
)
return len(data)
def _recv_into_py2(self, buf, nbytes):
err, data = win32file.ReadFile(self._handle, nbytes or len(buf))
n = len(data)
buf[:n] = data
return n
@check_closed
def send(self, string, flags=0):
err, nbytes = win32file.WriteFile(self._handle, string)
return nbytes
@check_closed
def sendall(self, string, flags=0):
return self.send(string, flags)
@check_closed
def sendto(self, string, address):
self.connect(address)
return self.send(string)
def setblocking(self, flag):
if flag:
return self.settimeout(None)
return self.settimeout(0)
def settimeout(self, value):
if value is None:
# Blocking mode
self._timeout = win32pipe.NMPWAIT_WAIT_FOREVER
elif not isinstance(value, (float, int)) or value < 0:
raise ValueError('Timeout value out of range')
elif value == 0:
# Non-blocking mode
self._timeout = win32pipe.NMPWAIT_NO_WAIT
else:
# Timeout mode - Value converted to milliseconds
self._timeout = value * 1000
def gettimeout(self):
return self._timeout
def setsockopt(self, level, optname, value):
raise NotImplementedError()
@check_closed
def shutdown(self, how):
return self.close()
class NpipeFileIOBase(io.RawIOBase):
def __init__(self, npipe_socket):
self.sock = npipe_socket
def close(self):
super().close()
self.sock = None
def fileno(self):
return self.sock.fileno()
def isatty(self):
return False
def readable(self):
return True
def readinto(self, buf):
return self.sock.recv_into(buf)
def seekable(self):
return False
def writable(self):
return False
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