Robots/bkmk_rforking.py

   1 """Forking robot
   2
   3 This file is a part of Bookmarks database and Internet robot.
   4 """
   5
   6 __author__ = "Oleg Broytman <phd@phdru.name>"
   7 __copyright__ = "Copyright (C) 2000-2023 PhiloSoft Design"
   8 __license__ = "GNU GPL"
   9
  10 __all__ = ['robot_forking']
  11
  12
  13 import sys, os
  14
  15 try:
  16     import cPickle as pickle
  17 except ImportError:
  18     import pickle
  19
  20 from subproc import Subprocess, RecordFile
  21 from bkmk_objects import Robot
  22
  23
  24 # This is to catch 'close failed: [Errno 9] Bad file descriptor' message
  25 # from os.close() in Subprocess.die() and errors from the subprocess.
  26 sys.stderr = open("err.log", 'a')
  27
  28 check_subp = None
  29 subp_pipe = None
  30
  31 def stop_subp(log):
  32     global check_subp, subp_pipe
  33     if check_subp:
  34         if log: log("   restarting hanging subprocess")
  35         del check_subp
  36     del subp_pipe
  37
  38 def restart_subp(log):
  39     global check_subp, subp_pipe
  40     stop_subp(log)
  41
  42     check_subp = Subprocess("%s/Robots/bkmk_rforking_sub.py" % os.path.dirname(sys.argv[0]),
  43                             control_stderr=True)
  44     subp_pipe = RecordFile(check_subp)
  45
  46
  47 _set_subproc = True
  48
  49 class robot_forking(Robot):
  50     subproc = 'urllib2'  # Default subprocess
  51
  52     def check_url(self, bookmark):
  53         global _set_subproc
  54         if _set_subproc:
  55             _set_subproc = False
  56
  57             subproc = self.subproc
  58             subproc_attrs = []
  59             for attr in dir(self):
  60                 if attr.startswith('subproc_'):
  61                     subproc_attrs.append((attr[len('subproc_'):], getattr(self, attr)))
  62             if subproc_attrs:
  63                 subproc += ':' + ':'.join(
  64                     ['='.join((k, v)) for k, v in subproc_attrs]
  65                 )
  66             os.environ['BKMK_ROBOT'] = subproc
  67
  68         if not check_subp:
  69             restart_subp(self.log)  # Not restart, just start afresh
  70
  71         try:
  72             save_parent = bookmark.parent
  73             bookmark.parent = None
  74             subp_pipe.write_record(pickle.dumps(bookmark))
  75
  76             if check_subp.waitForPendingChar(60):  # wait a minute
  77                 new_b = pickle.loads(subp_pipe.read_record())
  78                 for attr in (
  79                     "error", "no_error",
  80                     "moved", "size", "md5", "real_title",
  81                     "last_tested", "last_modified", "test_time",
  82                     "icon", "icon_href",
  83                 ):
  84                     if hasattr(new_b, attr):
  85                         setattr(bookmark, attr, getattr(new_b, attr))
  86             else:
  87                 bookmark.error = "Subprocess connection timed out"
  88                 restart_subp(self.log)
  89
  90             bookmark.parent = save_parent
  91
  92             while True:
  93                 error = check_subp.readPendingErrLine()
  94                 if not error:
  95                     break
  96                 sys.stderr.write("(subp) " + error)
  97             sys.stderr.flush()
  98
  99         except KeyboardInterrupt:
 100             return 0
 101
 102         # Tested
 103         return 1
 104
 105     def stop(self):
 106         stop_subp(None)  # Stop subprocess; do not log restarting