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# -*- test-case-name: twisted.test.test_process -*-
# Copyright (c) 2001-2009 Twisted Matrix Laboratories.
# See LICENSE for details.

"""
http://isometric.sixsided.org/_/gates_in_the_head/
"""

import os

# Win32 imports
import win32api
import win32con
import win32event
import win32file
import win32pipe
import win32process
import win32security

import pywintypes

# security attributes for pipes
PIPE_ATTRS_INHERITABLE = win32security.SECURITY_ATTRIBUTES()
PIPE_ATTRS_INHERITABLE.bInheritHandle = 1

from zope.interface import implements
from twisted.internet.interfaces import IProcessTransport, IConsumer, IProducer

from twisted.python.win32 import quoteArguments

from twisted.internet import error
from twisted.python import failure

from twisted.internet import _pollingfile
from twisted.internet._baseprocess import BaseProcess

def debug(msg):
    import sys
    print msg
    sys.stdout.flush()

class _Reaper(_pollingfile._PollableResource):

    def __init__(self, proc):
        self.proc = proc

    def checkWork(self):
        if win32event.WaitForSingleObject(self.proc.hProcess, 0) != win32event.WAIT_OBJECT_0:
            return 0
        exitCode = win32process.GetExitCodeProcess(self.proc.hProcess)
        self.deactivate()
        self.proc.processEnded(exitCode)
        return 0


def _findShebang(filename):
    """
    Look for a #! line, and return the value following the #! if one exists, or
    None if this file is not a script.

    I don't know if there are any conventions for quoting in Windows shebang
    lines, so this doesn't support any; therefore, you may not pass any
    arguments to scripts invoked as filters.  That's probably wrong, so if
    somebody knows more about the cultural expectations on Windows, please feel
    free to fix.

    This shebang line support was added in support of the CGI tests;
    appropriately enough, I determined that shebang lines are culturally
    accepted in the Windows world through this page::

        http://www.cgi101.com/learn/connect/winxp.html

    @param filename: str representing a filename

    @return: a str representing another filename.
    """
    f = file(filename, 'rU')
    if f.read(2) == '#!':
        exe = f.readline(1024).strip('\n')
        return exe

def _invalidWin32App(pywinerr):
    """
    Determine if a pywintypes.error is telling us that the given process is
    'not a valid win32 application', i.e. not a PE format executable.

    @param pywinerr: a pywintypes.error instance raised by CreateProcess

    @return: a boolean
    """

    # Let's do this better in the future, but I have no idea what this error
    # is; MSDN doesn't mention it, and there is no symbolic constant in
    # win32process module that represents 193.

    return pywinerr.args[0] == 193

class Process(_pollingfile._PollingTimer, BaseProcess):
    """A process that integrates with the Twisted event loop.

    If your subprocess is a python program, you need to:

     - Run python.exe with the '-u' command line option - this turns on
       unbuffered I/O. Buffering stdout/err/in can cause problems, see e.g.
       http://support.microsoft.com/default.aspx?scid=kb;EN-US;q1903

     - If you don't want Windows messing with data passed over
       stdin/out/err, set the pipes to be in binary mode::

        import os, sys, mscvrt
        msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
        msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
        msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)

    """
    implements(IProcessTransport, IConsumer, IProducer)

    closedNotifies = 0

    def __init__(self, reactor, protocol, command, args, environment, path):
        _pollingfile._PollingTimer.__init__(self, reactor)
        BaseProcess.__init__(self, protocol)

        # security attributes for pipes
        sAttrs = win32security.SECURITY_ATTRIBUTES()
        sAttrs.bInheritHandle = 1

        # create the pipes which will connect to the secondary process
        self.hStdoutR, hStdoutW = win32pipe.CreatePipe(sAttrs, 0)
        self.hStderrR, hStderrW = win32pipe.CreatePipe(sAttrs, 0)
        hStdinR,  self.hStdinW  = win32pipe.CreatePipe(sAttrs, 0)

        win32pipe.SetNamedPipeHandleState(self.hStdinW,
                                          win32pipe.PIPE_NOWAIT,
                                          None,
                                          None)

        # set the info structure for the new process.
        StartupInfo = win32process.STARTUPINFO()
        StartupInfo.hStdOutput = hStdoutW
        StartupInfo.hStdError  = hStderrW
        StartupInfo.hStdInput  = hStdinR
        StartupInfo.dwFlags = win32process.STARTF_USESTDHANDLES

        # Create new handles whose inheritance property is false
        currentPid = win32api.GetCurrentProcess()

        tmp = win32api.DuplicateHandle(currentPid, self.hStdoutR, currentPid, 0, 0,
                                       win32con.DUPLICATE_SAME_ACCESS)
        win32file.CloseHandle(self.hStdoutR)
        self.hStdoutR = tmp

        tmp = win32api.DuplicateHandle(currentPid, self.hStderrR, currentPid, 0, 0,
                                       win32con.DUPLICATE_SAME_ACCESS)
        win32file.CloseHandle(self.hStderrR)
        self.hStderrR = tmp

        tmp = win32api.DuplicateHandle(currentPid, self.hStdinW, currentPid, 0, 0,
                                       win32con.DUPLICATE_SAME_ACCESS)
        win32file.CloseHandle(self.hStdinW)
        self.hStdinW = tmp

        # Add the specified environment to the current environment - this is
        # necessary because certain operations are only supported on Windows
        # if certain environment variables are present.

        env = os.environ.copy()
        env.update(environment or {})

        cmdline = quoteArguments(args)
        # TODO: error detection here.
        def doCreate():
            self.hProcess, self.hThread, self.pid, dwTid = win32process.CreateProcess(
                command, cmdline, None, None, 1, 0, env, path, StartupInfo)
        try:
            doCreate()
        except pywintypes.error, pwte:
            if not _invalidWin32App(pwte):
                # This behavior isn't _really_ documented, but let's make it
                # consistent with the behavior that is documented.
                raise OSError(pwte)
            else:
                # look for a shebang line.  Insert the original 'command'
                # (actually a script) into the new arguments list.
                sheb = _findShebang(command)
                if sheb is None:
                    raise OSError(
                        "%r is neither a Windows executable, "
                        "nor a script with a shebang line" % command)
                else:
                    args = list(args)
                    args.insert(0, command)
                    cmdline = quoteArguments(args)
                    origcmd = command
                    command = sheb
                    try:
                        # Let's try again.
                        doCreate()
                    except pywintypes.error, pwte2:
                        # d'oh, failed again!
                        if _invalidWin32App(pwte2):
                            raise OSError(
                                "%r has an invalid shebang line: "
                                "%r is not a valid executable" % (
                                    origcmd, sheb))
                        raise OSError(pwte2)

        # close handles which only the child will use
        win32file.CloseHandle(hStderrW)
        win32file.CloseHandle(hStdoutW)
        win32file.CloseHandle(hStdinR)

        # set up everything
        self.stdout = _pollingfile._PollableReadPipe(
            self.hStdoutR,
            lambda data: self.proto.childDataReceived(1, data),
            self.outConnectionLost)

        self.stderr = _pollingfile._PollableReadPipe(
                self.hStderrR,
                lambda data: self.proto.childDataReceived(2, data),
                self.errConnectionLost)

        self.stdin = _pollingfile._PollableWritePipe(
            self.hStdinW, self.inConnectionLost)

        for pipewatcher in self.stdout, self.stderr, self.stdin:
            self._addPollableResource(pipewatcher)


        # notify protocol
        self.proto.makeConnection(self)

        self._addPollableResource(_Reaper(self))


    def signalProcess(self, signalID):
        if self.pid is None:
            raise error.ProcessExitedAlready()
        if signalID in ("INT", "TERM", "KILL"):
            win32process.TerminateProcess(self.hProcess, 1)


    def _getReason(self, status):
        if status == 0:
            return error.ProcessDone(status)
        return error.ProcessTerminated(status)


    def write(self, data):
        """Write data to the process' stdin."""
        self.stdin.write(data)

    def writeSequence(self, seq):
        """Write data to the process' stdin."""
        self.stdin.writeSequence(seq)

    def closeChildFD(self, fd):
        if fd == 0:
            self.closeStdin()
        elif fd == 1:
            self.closeStdout()
        elif fd == 2:
            self.closeStderr()
        else:
            raise NotImplementedError("Only standard-IO file descriptors available on win32")

    def closeStdin(self):
        """Close the process' stdin.
        """
        self.stdin.close()

    def closeStderr(self):
        self.stderr.close()

    def closeStdout(self):
        self.stdout.close()

    def loseConnection(self):
        """Close the process' stdout, in and err."""
        self.closeStdin()
        self.closeStdout()
        self.closeStderr()


    def outConnectionLost(self):
        self.proto.childConnectionLost(1)
        self.connectionLostNotify()


    def errConnectionLost(self):
        self.proto.childConnectionLost(2)
        self.connectionLostNotify()


    def inConnectionLost(self):
        self.proto.childConnectionLost(0)
        self.connectionLostNotify()


    def connectionLostNotify(self):
        """
        Will be called 3 times, by stdout/err threads and process handle.
        """
        self.closedNotifies += 1
        self.maybeCallProcessEnded()


    def maybeCallProcessEnded(self):
        if self.closedNotifies == 3 and self.lostProcess:
            win32file.CloseHandle(self.hProcess)
            win32file.CloseHandle(self.hThread)
            self.hProcess = None
            self.hThread = None
            BaseProcess.maybeCallProcessEnded(self)


    # IConsumer
    def registerProducer(self, producer, streaming):
        self.stdin.registerProducer(producer, streaming)

    def unregisterProducer(self):
        self.stdin.unregisterProducer()

    # IProducer
    def pauseProducing(self):
        self._pause()

    def resumeProducing(self):
        self._unpause()

    def stopProducing(self):
        self.loseConnection()


    def __repr__(self):
        """
        Return a string representation of the process.
        """
        return "<%s pid=%s>" % (self.__class__.__name__, self.pid)

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