Robots/bkmk_rforking.py

   1 """
   2    Forking robot
   3
   4    Written by BroytMann. Copyright (C) 2000-2007 PhiloSoft Design.
   5 """
   6
   7
   8 try:
   9    import cPickle
  10    pickle = cPickle
  11 except ImportError:
  12    import pickle
  13
  14 import sys, os
  15 from subproc import Subprocess, RecordFile
  16
  17 # This is to catch 'close failed: [Errno 9] Bad file descriptor'
  18 # message from os.close() in Subprocess.die().
  19 sys.stderr = open("err.log", 'w')
  20
  21 check_subp = None
  22 subp_pipe = None
  23
  24 def stop_subp(log):
  25    global check_subp, subp_pipe
  26    if check_subp:
  27       if log: log("   restarting hanging subprocess")
  28       del check_subp
  29    del subp_pipe
  30
  31 def restart_subp(log):
  32    global check_subp, subp_pipe
  33    stop_subp(log)
  34
  35    check_subp = Subprocess("%s/Robots/bkmk_rforking_sub.py" % os.path.dirname(sys.argv[0]))
  36    subp_pipe = RecordFile(check_subp)
  37
  38
  39 from bkmk_objects import Robot
  40
  41 class robot_forking(Robot):
  42    def check_url(self, bookmark):
  43       if not check_subp:
  44          restart_subp(self.log) # Not restart, just start afresh
  45
  46       try:
  47          save_parent = bookmark.parent
  48          bookmark.parent = None
  49
  50          bookmark.tempfname = self.tempfname
  51          subp_pipe.write_record(pickle.dumps(bookmark))
  52
  53          if check_subp.waitForPendingChar(900): # wait 15 minutes
  54             new_b = pickle.loads(subp_pipe.read_record())
  55             for attr in ("error", "no_error",
  56                   "moved", "size", "md5", "real_title",
  57                   "last_tested", "last_modified", "test_time", "icon"):
  58                if hasattr(new_b, attr):
  59                   setattr(bookmark, attr, getattr(new_b, attr))
  60          else:
  61             bookmark.error = "Subprocess connection timed out"
  62             restart_subp(self.log)
  63
  64          bookmark.parent = save_parent
  65
  66       except KeyboardInterrupt:
  67          return 0
  68
  69       # Tested
  70       return 1
  71
  72
  73    def stop(self):
  74       stop_subp(None) # Stop subprocess; do not log restarting