command_executer.py

   1 # Pyvconv - A simple frontend for ffmpeg/mencoder
   2 # Copyright (C) 2008,  Kristian Rumberg (kristianrumberg@gmail.com)
   3
   4 # Permission to use, copy, modify, and/or distribute this software for any
   5 # purpose with or without fee is hereby granted, provided that the above
   6 # copyright notice and this permission notice appear in all copies.
   7
   8 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15
  16 import re
  17 import os
  18 import time
  19 import datetime
  20 import subprocess
  21 import thread
  22 import threading
  23 import signal
  24 from commands import Variable
  25
  26 class CommandExecuterView:
  27     def __init__(self):
  28         pass
  29
  30     def recieve_executor(self, executor):
  31         pass
  32
  33     def starting_conversion(self, infile, index, total, outfile):
  34         pass
  35
  36     def update_progress(self, logline):
  37         pass
  38
  39     def error(self):
  40         pass
  41
  42     def finished_all(self):
  43         pass
  44
  45 class CommandExecuter:
  46     def mk_unique_subdir(self, parentdir):
  47         p = re.compile("[\ ,\/,\(,\)]")
  48         namepart = p.sub("_", self.command.get_name())
  49         print namepart
  50
  51         t = datetime.datetime.now()
  52         newdir = parentdir + "/" + namepart + "_" + str(time.mktime(t.timetuple()))
  53
  54         if os.path.isdir(newdir):
  55             raise OSError("Unable to make up unique name for new folder")
  56         elif os.path.isfile(newdir):
  57             raise OSError("a file with the same name as the desired " \
  58                       "dir, '%s', already exists." % newdir)
  59         else:
  60             os.mkdir(newdir)
  61             return newdir
  62
  63     def __init__(self, cmdexecview, command, infilelist, outdir):
  64         self.cmdexecview = cmdexecview
  65         self.command = command
  66         self.infilelist = infilelist
  67         self.outdir = self.mk_unique_subdir(outdir)
  68
  69         self.please_abort = False
  70
  71         self.shared_vars_lock = threading.Lock()
  72         thread.start_new_thread(self._run_conversion, ())
  73
  74     def abort(self):
  75         self.shared_vars_lock.acquire()
  76         self.please_abort = True
  77         self.shared_vars_lock.release()
  78
  79     def _run_conversion(self):
  80         index = 0
  81         total = len(self.infilelist)
  82
  83         for infile in self.infilelist:
  84             outfile = self.outdir + "/" + os.path.basename(infile) + "_converted"
  85
  86             index = index + 1
  87
  88             self.command.put_var(Variable("in", infile))
  89             self.command.put_var(Variable("out", outfile))
  90
  91             self.cmdexecview.starting_conversion(infile, index, total, outfile)
  92
  93             p = subprocess.Popen(str(self.command), shell = True, universal_newlines=True, stderr = subprocess.PIPE)
  94             ostream = p.stderr
  95
  96             self.cmdexecview.recieve_executor(self)
  97
  98             newline = str(chr(32) * 4)
  99             buff = ""
 100             c = 1
 101             iskip = 10
 102             skipc = 0
 103
 104             while c:
 105                 c = ostream.read(1)
 106                 buff = buff + c
 107                 if buff.endswith(newline):
 108                     skipc = (skipc + 1) % iskip
 109                     if skipc == 0:
 110                         self.cmdexecview.update_progress(buff.strip())
 111                     buff = ""
 112
 113                 self.shared_vars_lock.acquire()
 114                 if self.please_abort == True:
 115                     ostream.close()
 116                     os.kill(p.pid, signal.SIGTERM)
 117                     return
 118                 self.shared_vars_lock.release()
 119
 120             ostream.close()
 121
 122             res = p.wait()
 123
 124             if res < 0:
 125                 self.cmdexecview.error()
 126                 return
 127
 128         self.cmdexecview.finished_all()