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windows_utils.py
""" Various Windows specific bits and pieces """ import sys if sys.platform != 'win32': # pragma: no cover raise ImportError('win32 only') import _winapi import itertools import msvcrt import os import socket import subprocess import tempfile import warnings __all__ = ['socketpair', 'pipe', 'Popen', 'PIPE', 'PipeHandle'] # Constants/globals BUFSIZE = 8192 PIPE = subprocess.PIPE STDOUT = subprocess.STDOUT _mmap_counter = itertools.count() if hasattr(socket, 'socketpair'): # Since Python 3.5, socket.socketpair() is now also available on Windows socketpair = socket.socketpair else: # Replacement for socket.socketpair() def socketpair(family=socket.AF_INET, type=socket.SOCK_STREAM, proto=0): """A socket pair usable as a self-pipe, for Windows. Origin: https://gist.github.com/4325783, by Geert Jansen. Public domain. """ if family == socket.AF_INET: host = '127.0.0.1' elif family == socket.AF_INET6: host = '::1' else: raise ValueError("Only AF_INET and AF_INET6 socket address " "families are supported") if type != socket.SOCK_STREAM: raise ValueError("Only SOCK_STREAM socket type is supported") if proto != 0: raise ValueError("Only protocol zero is supported") # We create a connected TCP socket. Note the trick with setblocking(0) # that prevents us from having to create a thread. lsock = socket.socket(family, type, proto) try: lsock.bind((host, 0)) lsock.listen(1) # On IPv6, ignore flow_info and scope_id addr, port = lsock.getsockname()[:2] csock = socket.socket(family, type, proto) try: csock.setblocking(False) try: csock.connect((addr, port)) except (BlockingIOError, InterruptedError): pass csock.setblocking(True) ssock, _ = lsock.accept() except: csock.close() raise finally: lsock.close() return (ssock, csock) # Replacement for os.pipe() using handles instead of fds def pipe(*, duplex=False, overlapped=(True, True), bufsize=BUFSIZE): """Like os.pipe() but with overlapped support and using handles not fds.""" address = tempfile.mktemp(prefix=r'\\.\pipe\python-pipe-%d-%d-' % (os.getpid(), next(_mmap_counter))) if duplex: openmode = _winapi.PIPE_ACCESS_DUPLEX access = _winapi.GENERIC_READ | _winapi.GENERIC_WRITE obsize, ibsize = bufsize, bufsize else: openmode = _winapi.PIPE_ACCESS_INBOUND access = _winapi.GENERIC_WRITE obsize, ibsize = 0, bufsize openmode |= _winapi.FILE_FLAG_FIRST_PIPE_INSTANCE if overlapped[0]: openmode |= _winapi.FILE_FLAG_OVERLAPPED if overlapped[1]: flags_and_attribs = _winapi.FILE_FLAG_OVERLAPPED else: flags_and_attribs = 0 h1 = h2 = None try: h1 = _winapi.CreateNamedPipe( address, openmode, _winapi.PIPE_WAIT, 1, obsize, ibsize, _winapi.NMPWAIT_WAIT_FOREVER, _winapi.NULL) h2 = _winapi.CreateFile( address, access, 0, _winapi.NULL, _winapi.OPEN_EXISTING, flags_and_attribs, _winapi.NULL) ov = _winapi.ConnectNamedPipe(h1, overlapped=True) ov.GetOverlappedResult(True) return h1, h2 except: if h1 is not None: _winapi.CloseHandle(h1) if h2 is not None: _winapi.CloseHandle(h2) raise # Wrapper for a pipe handle class PipeHandle: """Wrapper for an overlapped pipe handle which is vaguely file-object like. The IOCP event loop can use these instead of socket objects. """ def __init__(self, handle): self._handle = handle def __repr__(self): if self._handle is not None: handle = 'handle=%r' % self._handle else: handle = 'closed' return '<%s %s>' % (self.__class__.__name__, handle) @property def handle(self): return self._handle def fileno(self): if self._handle is None: raise ValueError("I/O operatioon on closed pipe") return self._handle def close(self, *, CloseHandle=_winapi.CloseHandle): if self._handle is not None: CloseHandle(self._handle) self._handle = None def __del__(self): if self._handle is not None: warnings.warn("unclosed %r" % self, ResourceWarning, source=self) self.close() def __enter__(self): return self def __exit__(self, t, v, tb): self.close() # Replacement for subprocess.Popen using overlapped pipe handles class Popen(subprocess.Popen): """Replacement for subprocess.Popen using overlapped pipe handles. The stdin, stdout, stderr are None or instances of PipeHandle. """ def __init__(self, args, stdin=None, stdout=None, stderr=None, **kwds): assert not kwds.get('universal_newlines') assert kwds.get('bufsize', 0) == 0 stdin_rfd = stdout_wfd = stderr_wfd = None stdin_wh = stdout_rh = stderr_rh = None if stdin == PIPE: stdin_rh, stdin_wh = pipe(overlapped=(False, True), duplex=True) stdin_rfd = msvcrt.open_osfhandle(stdin_rh, os.O_RDONLY) else: stdin_rfd = stdin if stdout == PIPE: stdout_rh, stdout_wh = pipe(overlapped=(True, False)) stdout_wfd = msvcrt.open_osfhandle(stdout_wh, 0) else: stdout_wfd = stdout if stderr == PIPE: stderr_rh, stderr_wh = pipe(overlapped=(True, False)) stderr_wfd = msvcrt.open_osfhandle(stderr_wh, 0) elif stderr == STDOUT: stderr_wfd = stdout_wfd else: stderr_wfd = stderr try: super().__init__(args, stdin=stdin_rfd, stdout=stdout_wfd, stderr=stderr_wfd, **kwds) except: for h in (stdin_wh, stdout_rh, stderr_rh): if h is not None: _winapi.CloseHandle(h) raise else: if stdin_wh is not None: self.stdin = PipeHandle(stdin_wh) if stdout_rh is not None: self.stdout = PipeHandle(stdout_rh) if stderr_rh is not None: self.stderr = PipeHandle(stderr_rh) finally: if stdin == PIPE: os.close(stdin_rfd) if stdout == PIPE: os.close(stdout_wfd) if stderr == PIPE: os.close(stderr_wfd)
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