269 lines
8.4 KiB
Python
269 lines
8.4 KiB
Python
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"""
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Platform dependent plugin execution helper functions.
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"""
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import os
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import sys
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import uuid
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__all__ = ["generate_pipename",
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"create_pipe",
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"validate_plugin",
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"launch_plugin",
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"connect_pipe",
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"write_outconfig",
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"close_pipe",
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"PipeError"]
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CONNECT_TIMEOUT_SECS = 45
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class PipeError(Exception):
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pass
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mswindows = (sys.platform == "win32")
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if mswindows:
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import win32pipe
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import win32file
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import pywintypes
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import win32event
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import subprocess
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ERROR_PIPE_CONNECTED = 535
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ERROR_IO_PENDING = 997
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PIPE_PREFIX = "\\\\.\\pipe\\fb-pipe"
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else:
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import signal
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import subprocess
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PIPE_PREFIX = "/tmp/fb-pipe-"
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#
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# Cross platform functions
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#
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def generate_pipename():
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return PIPE_PREFIX + str(uuid.uuid4())
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#
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# MS Windows
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#
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if mswindows:
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def create_pipe(pipeName):
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# XXX - We should validate here and return None on fail
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pipe = win32pipe.CreateNamedPipe(pipeName,
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win32pipe.PIPE_ACCESS_INBOUND | win32file.FILE_FLAG_OVERLAPPED,
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0x0,
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1,
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1024,
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1024,
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0,
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None)
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return pipe
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def validate_plugin(binName, inName, io):
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cmdLine = []
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if binName.endswith(".py"):
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cmdLine.append("python.exe")
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cmdLine.append("\"%s\"" % binName)
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cmdLine.append("--InConfig \"%s\"" % inName)
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cmdLine.append("--ValidateOnly true")
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try:
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retcode = subprocess.call(" ".join(cmdLine),
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stdout=io.stdout,
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stderr=io.stdout,
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stdin=io.stdin,
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env=os.environ)
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except OSError, e:
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io.print_error("Failed to execute: %s" % str(e))
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retcode = 1
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return retcode
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def launch_plugin(binName, inName, pipeName, logFile, io, newconsole):
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"""Execute the process with the passed in parameters. Note that the
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output parameter is not a file name, but rather a named pipe!"""
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if newconsole:
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cmdLine = []
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cmdLine.append("start \"%s\" cmd /T:9F /K " % binName)
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if binName.endswith(".py"):
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cmdLine.append("\"python.exe \"%s\"" % binName)
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else:
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cmdLine.append("\"\"%s\"" % binName)
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cmdLine.append("--InConfig \"%s\"" % inName)
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cmdLine.append("--OutConfig \"%s\"" % pipeName)
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cmdLine.append("--LogFile \"%s\"\"" % logFile)
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p = subprocess.Popen(" ".join(cmdLine), shell=True, env=os.environ)
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else:
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cmdLine = []
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if binName.endswith(".py"):
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cmdLine.append("python.exe")
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cmdLine.append("\"%s\"" % binName)
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cmdLine.append("--InConfig \"%s\"" % inName)
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cmdLine.append("--OutConfig \"%s\"" % pipeName)
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cmdLine.append("--LogFile \"%s\"" % logFile)
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p = subprocess.Popen(" ".join(cmdLine),
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shell=False,
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stdout=io.stdout,
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stderr=io.stderr,
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stdin=io.stdin,
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env=os.environ)
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return p
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def connect_pipe(pipe, pipeName):
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overLap = pywintypes.OVERLAPPED()
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overLap.hEvent = win32event.CreateEvent(None, 1, 0, None)
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if overLap.hEvent == 0:
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raise PipeError('Could not create hEvent')
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try:
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# Wait for a pipe client connection
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ret = win32pipe.ConnectNamedPipe(pipe, overLap)
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if not ret in (0, ERROR_PIPE_CONNECTED):
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if ret == ERROR_IO_PENDING:
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ret = win32event.WaitForSingleObject(overLap.hEvent,
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1000 * CONNECT_TIMEOUT_SECS)
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if ret != win32event.WAIT_OBJECT_0:
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# Timeout error
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raise PipeError('Timeout error')
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else:
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# API error
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raise PipeError('API error')
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ret = win32pipe.GetOverlappedResult(pipe, overLap, True)
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if not ret in (0, ERROR_PIPE_CONNECTED):
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# API Error
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raise PipeError('API error 2')
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except PipeError:
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# Named pipe exception
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win32file.CancelIo(pipe)
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pipe.close()
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raise
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except BaseException, err:
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win32file.CancelIo(pipe)
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pipe.close()
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pipe = None
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raise PipeError('BaseException : ' + str(err))
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return pipe
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def write_outconfig(fileName, pipe):
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tmpFile = open(fileName, "w")
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while 1:
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try:
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(ret, line) = win32file.ReadFile(pipe, 4096, None)
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if ret != 0 or line == "":
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break
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else:
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tmpFile.write(line)
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except:
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break
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tmpFile.close()
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def close_pipe(pipe):
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win32file.CancelIo(pipe)
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pipe.close()
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#
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# Linux
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#
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else:
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def SIGALRM_handler(sigNum, frame):
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return
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def create_pipe(pipename):
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os.mkfifo(pipename, 0666)
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return None
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def launch_plugin(binName, inName, pipeName, logFile, io, newconsole):
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"""Execute the process with the passed in parameters. Note that the
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output parameter is not a file name, but rather a named pipe!"""
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if newconsole:
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cmdLine = []
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cmdLine.append("/usr/bin/xterm -hold -T \"%s\" -e " % binName)
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cmdLine.append("\"%s\"" % binName)
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cmdLine.append("--InConfig \"%s\"" % inName) # Contains the input parameters
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cmdLine.append("--OutConfig \"%s\"" % pipeName)
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cmdLine.append("--LogFile \"%s\"" % logFile)
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p = subprocess.Popen(" ".join(cmdLine), shell=True, env=os.environ)
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else:
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cmdLine = []
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if binName.endswith(".py"):
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cmdLine.append("/usr/bin/python2.6")
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cmdLine.append("\"%s\"" % binName)
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cmdLine.append("--InConfig \"%s\"" % inName) # Contains the input parameters
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cmdLine.append("--OutConfig \"%s\"" % pipeName)
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cmdLine.append("--LogFile \"%s\"" % logFile)
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p = subprocess.Popen(" ".join(cmdLine), shell=True,
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stdout=io.stdout,
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stderr=io.stderr,
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stdin=io.stdin,
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env=os.environ)
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return p
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def validate_plugin(binName, inName, io):
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cmdLine = []
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if binName.endswith(".py"):
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cmdLine.append("/usr/bin/python2.6")
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cmdLine.append("\"%s\"" % binName)
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cmdLine.append("--InConfig \"%s\"" % inName)
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cmdLine.append("--ValidateOnly true")
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try:
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retcode = subprocess.call(" ".join(cmdLine),
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stdout=io.stdout,
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stderr=io.stdout,
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stdin=io.stdin,
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shell=True,
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env=os.environ)
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except OSError, e:
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io.print_error("Failed to execute: %s" % str(e))
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retcode = 1
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return retcode
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def connect_pipe(pipe, pipeName):
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"""
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"""
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oldHandler = signal.getsignal(signal.SIGALRM)
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try:
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signal.signal(signal.SIGALRM, SIGALRM_handler)
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signal.alarm(CONNECT_TIMEOUT_SECS + 1)
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retval = os.open(pipeName, os.O_RDONLY)
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signal.alarm(0)
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except OSError:
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# Alarm Timeout
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retval = None
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except BaseException:
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# Keyboard interrupt
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retval = None
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# cancel the alarm and restore prev handler
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signal.signal(signal.SIGALRM, oldHandler)
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return retval
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def write_outconfig(fileName, pipe):
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tmpFile = open(fileName, "w")
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while 1:
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line = os.read(pipe, 4096)
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if len(line) == 0:
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break
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else:
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tmpFile.write(line)
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tmpFile.close()
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def close_pipe(pipe):
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os.close(pipe)
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