Robots/bkmk_rforking.py

   1 """
   2    Forking robot
   3
   4    Written by Broytman. Copyright (C) 2000-2010 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' message
  18 # from os.close() in Subprocess.die() and errors from from the subprocess.
  19 sys.stderr = open("err.log", 'a')
  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       control_stderr=True)
  37    subp_pipe = RecordFile(check_subp)
  38
  39
  40 from bkmk_objects import Robot
  41
  42 class robot_forking(Robot):
  43    def check_url(self, bookmark):
  44       if not check_subp:
  45          restart_subp(self.log) # Not restart, just start afresh
  46
  47       try:
  48          save_parent = bookmark.parent
  49          bookmark.parent = None
  50          subp_pipe.write_record(pickle.dumps(bookmark))
  51
  52          if check_subp.waitForPendingChar(60): # wait a minute
  53             new_b = pickle.loads(subp_pipe.read_record())
  54             for attr in ("error", "no_error",
  55                   "moved", "size", "md5", "real_title",
  56                   "last_tested", "last_modified", "test_time",
  57                   "icon", "icon_href"):
  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          while True:
  67             error = check_subp.readPendingErrLine()
  68             if not error:
  69                break
  70             sys.stderr.write("(subp) " + error)
  71          sys.stderr.flush()
  72
  73       except KeyboardInterrupt:
  74          return 0
  75
  76       # Tested
  77       return 1
  78
  79
  80    def stop(self):
  81       stop_subp(None) # Stop subprocess; do not log restarting