#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This file is part of Beremiz, a Integrated Development Environment for
# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
#
# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
#
# See COPYING file for copyrights details.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
from __future__ import absolute_import
import os
import sys
import subprocess
import ctypes
from threading import Timer, Lock, Thread, Semaphore
import signal
_debug = os.path.exists("BEREMIZ_DEBUG")
class outputThread(Thread):
"""
Thread is used to print the output of a command to the stdout
"""
def __init__(self, Proc, fd, callback=None, endcallback=None):
Thread.__init__(self)
self.killed = False
self.finished = False
self.retval = None
self.Proc = Proc
self.callback = callback
self.endcallback = endcallback
self.fd = fd
def run(self):
outchunk = None
self.retval = None
while self.retval is None and not self.killed:
if self.endcallback:
self.retval = self.Proc.poll()
else:
self.retval = self.Proc.returncode
outchunk = self.fd.readline()
if self.callback:
self.callback(outchunk)
while outchunk != '' and not self.killed:
outchunk = self.fd.readline()
if self.callback:
self.callback(outchunk)
if self.endcallback:
try:
err = self.Proc.wait()
except Exception:
err = self.retval
self.finished = True
self.endcallback(self.Proc.pid, err)
class ProcessLogger(object):
def __init__(self, logger, Command, finish_callback=None,
no_stdout=False, no_stderr=False, no_gui=True,
timeout=None, outlimit=None, errlimit=None,
endlog=None, keyword=None, kill_it=False, cwd=None,
encoding=None, output_encoding=None):
assert(logger)
self.logger = logger
if not isinstance(Command, list):
self.Command_str = Command
self.Command = []
for i, word in enumerate(Command.replace("'", '"').split('"')):
if i % 2 == 0:
word = word.strip()
if len(word) > 0:
self.Command.extend(word.split())
else:
self.Command.append(word)
else:
self.Command = Command
self.Command_str = subprocess.list2cmdline(self.Command)
fsencoding = sys.getfilesystemencoding()
self.output_encoding = output_encoding
if encoding is None:
encoding = fsencoding
self.Command = [self.Command[0].encode(fsencoding)]+map(
lambda x: x.encode(encoding), self.Command[1:])
self.finish_callback = finish_callback
self.no_stdout = no_stdout
self.no_stderr = no_stderr
self.startupinfo = None
self.errlen = 0
self.outlen = 0
self.errlimit = errlimit
self.outlimit = outlimit
self.exitcode = None
self.outdata = []
self.errdata = []
self.keyword = keyword
self.kill_it = kill_it
self.startsem = Semaphore(0)
self.finishsem = Semaphore(0)
self.endlock = Lock()
popenargs = {
"cwd": os.getcwd() if cwd is None else cwd,
"stdin": subprocess.PIPE,
"stdout": subprocess.PIPE,
"stderr": subprocess.PIPE
}
if no_gui and os.name in ("nt", "ce"):
self.startupinfo = subprocess.STARTUPINFO()
self.startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
popenargs["startupinfo"] = self.startupinfo
elif os.name == 'posix':
popenargs["shell"] = False
if timeout:
self.timeout = Timer(timeout, self.endlog)
self.timeout.start()
else:
self.timeout = None
self.Proc = subprocess.Popen(self.Command, **popenargs)
self.outt = outputThread(
self.Proc,
self.Proc.stdout,
self.output,
self.finish)
self.outt.start()
self.errt = outputThread(
self.Proc,
self.Proc.stderr,
self.errors)
self.errt.start()
self.startsem.release()
def output(self, v):
if v and self.output_encoding:
v = v.decode(self.output_encoding)
self.outdata.append(v)
self.outlen += 1
if not self.no_stdout:
self.logger.write(v)
if (self.keyword and v.find(self.keyword) != -1) or (self.outlimit and self.outlen > self.outlimit):
self.endlog()
def errors(self, v):
if v and self.output_encoding:
v = v.decode(self.output_encoding)
self.errdata.append(v)
self.errlen += 1
if not self.no_stderr:
self.logger.write_warning(v)
if self.errlimit and self.errlen > self.errlimit:
self.endlog()
def log_the_end(self, ecode, pid):
if self.logger is not None:
self.logger.write(self.Command_str + "\n")
self.logger.write_warning(_("exited with status {a1} (pid {a2})\n").format(a1=str(ecode), a2=str(pid)))
def finish(self, pid, ecode):
# avoid running function before start is finished
self.startsem.acquire()
self.startsem.release()
if self.timeout:
self.timeout.cancel()
self.exitcode = ecode
if _debug or self.exitcode != 0:
self.log_the_end(ecode, pid)
if self.finish_callback is not None:
self.finish_callback(self, ecode, pid)
self.errt.join()
self.finishsem.release()
def kill(self, gently=True):
# avoid running kill before start is finished
self.startsem.acquire()
self.startsem.release()
self.outt.killed = True
self.errt.killed = True
if os.name in ("nt", "ce"):
PROCESS_TERMINATE = 1
handle = ctypes.windll.kernel32.OpenProcess(PROCESS_TERMINATE, False, self.Proc.pid)
ctypes.windll.kernel32.TerminateProcess(handle, -1)
ctypes.windll.kernel32.CloseHandle(handle)
else:
if gently:
sig = signal.SIGTERM
else:
sig = signal.SIGKILL
try:
os.kill(self.Proc.pid, sig)
except Exception:
pass
self.outt.join()
self.errt.join()
def endlog(self):
if self.endlock.acquire(False):
if not self.outt.finished and self.kill_it:
self.kill()
self.finishsem.release()
def spin(self):
self.finishsem.acquire()
return [self.exitcode, "".join(self.outdata), "".join(self.errdata)]