wxPopen.py
author greg
Mon, 18 May 2009 07:58:41 +0200
changeset 345 a3520d75a722
parent 235 a66e150f2888
child 361 331d698e1118
permissions -rw-r--r--
get the WaitPythonCommands return (semaphore error code) to quit python_iterator loop when semaphore is destroyed
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#This file is part of Beremiz, a Integrated Development Environment for
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#programming IEC 61131-3 automates supporting plcopen standard and CanFestival. 
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#
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#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
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#
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#See COPYING file for copyrights details.
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#
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#This library is free software; you can redistribute it and/or
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#modify it under the terms of the GNU General Public
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#License as published by the Free Software Foundation; either
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#version 2.1 of the License, or (at your option) any later version.
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#
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#This library is distributed in the hope that it will be useful,
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#but WITHOUT ANY WARRANTY; without even the implied warranty of
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#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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#General Public License for more details.
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#
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#You should have received a copy of the GNU General Public
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#License along with this library; if not, write to the Free Software
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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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import time
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import wx
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import subprocess, ctypes
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import threading
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import os
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if os.name == 'posix':
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    from signal import SIGTERM, SIGKILL
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class outputThread(threading.Thread):
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    """
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    Thread is used to print the output of a command to the stdout
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    """
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    def __init__(self, Proc, fd, callback=None, endcallback=None):
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        threading.Thread.__init__(self)
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        self.killed = False
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        self.finished = False
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        self.retval = None
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        self.Proc = Proc
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        self.callback = callback
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        self.endcallback = endcallback
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        self.fd = fd
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    def run(self):
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        outchunk = None
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        self.retval = None
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        while outchunk != '' and not self.killed :
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            outchunk = self.fd.readline()
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            if self.callback : self.callback(outchunk)
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        while self.retval is None and not self.killed :
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            self.retval = self.Proc.poll()
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            outchunk = self.fd.readline()
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            if self.callback : self.callback(outchunk)
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        while outchunk != '' and not self.killed :
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            outchunk = self.fd.readline()
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        if self.endcallback:
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            try:
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                err = self.Proc.wait()
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            except:
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                err = self.retval
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            self.finished = True
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            wx.CallAfter(self.endcallback, self.Proc.pid, err)
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class ProcessLogger:
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    def __init__(self, logger, Command, finish_callback=None, no_stdout=False, no_stderr=False, no_gui=True):
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        self.logger = logger
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        self.Command_str = Command
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        self.Command = []
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        for i,word in enumerate(Command.replace("'",'"').split('"')):
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            if i % 2 == 0:
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                word = word.strip()
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                if len(word) > 0:
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                    self.Command.extend(word.split())
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            else:
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                self.Command.append(word)
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        self.finish_callback = finish_callback
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        self.no_stdout = no_stdout
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        self.no_stderr = no_stderr
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        self.startupinfo = None
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        self.errlen = 0
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        self.outlen = 0
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        self.exitcode = None
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        self.outdata = ""
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        self.errdata = ""
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        self.finished = False
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        popenargs= {
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               "cwd":os.getcwd(),
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               "stdin":subprocess.PIPE, 
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               "stdout":subprocess.PIPE, 
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               "stderr":subprocess.PIPE}
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        if no_gui == True and wx.Platform == '__WXMSW__':
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            self.startupinfo = subprocess.STARTUPINFO()
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            self.startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
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            popenargs["startupinfo"] = self.startupinfo
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        elif wx.Platform == '__WXGTK__':
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            popenargs["shell"] = False  #True
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        self.Proc = subprocess.Popen( self.Command, **popenargs )
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        self.outt = outputThread(
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                      self.Proc,
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                      self.Proc.stdout,
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                      self.output,
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                      self.finish) 
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        self.outt.start()
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        self.errt = outputThread(
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                      self.Proc,
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                      self.Proc.stderr,
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                      self.errors)
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        self.errt.start()
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    def output(self,v):
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        self.outdata += v
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        self.outlen += 1
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        if not self.no_stdout:
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            wx.CallAfter(self.logger.write,v)
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    def errors(self,v):
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        self.errdata += v
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        self.errlen += 1
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        if not self.no_stderr:
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            wx.CallAfter(self.logger.write_warning,v)
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    def log_the_end(self,ecode,pid):
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        self.logger.write(self.Command_str + "\n")
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        self.logger.write_warning("exited with status %s (pid %s)\n"%(str(ecode),str(pid)))
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    def finish(self, pid,ecode):
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        self.finished = True
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        self.exitcode = ecode
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        if self.exitcode != 0:
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            wx.CallAfter(self.log_the_end,ecode,pid)
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        if self.finish_callback is not None:
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            self.finish_callback(self,ecode,pid)
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    def kill(self,gently=True):
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        self.outt.killed = True
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        self.errt.killed = True
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        if wx.Platform == '__WXMSW__':
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            PROCESS_TERMINATE = 1
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            handle = ctypes.windll.kernel32.OpenProcess(PROCESS_TERMINATE, False, self.Proc.pid)
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            ctypes.windll.kernel32.TerminateProcess(handle, -1)
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            ctypes.windll.kernel32.CloseHandle(handle)
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        else:
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            if gently:
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                sig=SIGTERM
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            else:
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                sig=SIGKILL
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            try:
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                os.kill(self.Proc.pid, sig)
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            except:
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                pass
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        self.outt.join()
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        self.errt.join()
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    def spin(self, timeout=None, out_limit=None, err_limit=None, keyword = None, kill_it = True):
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        count = 0
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        while not self.finished:
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            if err_limit and self.errlen > err_limit:
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                break
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            if out_limit and self.outlen > out_limit:
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                break
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            if timeout:
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                if count > timeout:
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                    break
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                count += 1
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            if keyword and self.outdata.find(keyword)!=-1:
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                    break
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            wx.Yield()
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            time.sleep(0.01)
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        if not self.outt.finished and kill_it:
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            self.kill()
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        return [self.exitcode, self.outdata, self.errdata]
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