monitor/util/command.py

   1 import os
   2 from select import select
   3 import subprocess
   4 import signal
   5 import time
   6 import traceback
   7
   8 DEBUG= 0
   9
  10 class ExceptionTimeout(Exception): pass
  11 COMMAND_TIMEOUT = 60
  12 ssh_options = { 'StrictHostKeyChecking':'no',
  13                                 'BatchMode':'yes',
  14                                 'PasswordAuthentication':'no',
  15                                 'ConnectTimeout':'%s' % COMMAND_TIMEOUT}
  16
  17 class Sopen(subprocess.Popen):
  18         def kill(self, signal = signal.SIGTERM):
  19                 os.kill(self.pid, signal)
  20
  21 def read_t(stream, count, timeout=COMMAND_TIMEOUT*2):
  22         lin, lout, lerr = select([stream], [], [], timeout)
  23         if len(lin) == 0:
  24                 raise ExceptionTimeout("TIMEOUT Running: %s" % cmd)
  25
  26         return stream.read(count)
  27
  28 class CMD:
  29         def __init__(self):
  30                 pass
  31
  32         def run_noexcept(self, cmd, timeout=COMMAND_TIMEOUT*2):
  33
  34                 #print "CMD.run_noexcept(%s)" % cmd
  35                 try:
  36                         return CMD.run(self,cmd,timeout)
  37                 except ExceptionTimeout:
  38                         print traceback.print_exc()
  39                         return ("", "SCRIPTTIMEOUT")
  40
  41         def system(self, cmd, timeout=COMMAND_TIMEOUT*2):
  42                 (o,e) = self.run(cmd, timeout)
  43                 self.output = o
  44                 self.error = e
  45                 if self.s.returncode is None:
  46                         self.s.wait()
  47                 return self.s.returncode
  48
  49         def run(self, cmd, timeout=COMMAND_TIMEOUT*2):
  50
  51                 #print "CMD.run(%s)" % cmd
  52                 s = Sopen(cmd, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True)
  53                 self.s = s
  54                 (f_in, f_out, f_err) = (s.stdin, s.stdout, s.stderr)
  55                 #print "calling select(%s)" % timeout
  56                 lout, lin, lerr = select([f_out], [], [f_err], timeout)
  57                 #print "TIMEOUT!!!!!!!!!!!!!!!!!!!"
  58                 if len(lin) == 0 and len(lout) == 0 and len(lerr) == 0:
  59                         # Reached a timeout!  Nuke process so it does not hang.
  60                         #print "KILLING"
  61                         s.kill(signal.SIGKILL)
  62                         raise ExceptionTimeout("TIMEOUT Running: %s" % cmd)
  63                 else:
  64                         #print "RETURNING"
  65                         #print len(lin), len(lout), len(lerr)
  66                         pass
  67
  68                 o_value = ""
  69                 e_value = ""
  70
  71                 o_value = f_out.read()
  72                 e_value = f_err.read()
  73
  74                 #print "striping output"
  75                 o_value = o_value.strip()
  76                 e_value = e_value.strip()
  77
  78                 #print "OUTPUT -%s-%s-" % (o_value, e_value)
  79
  80                 #print "closing files"
  81                 f_out.close()
  82                 f_in.close()
  83                 f_err.close()
  84                 try:
  85                         #print "s.kill()"
  86                         s.kill()
  87                         #print "after s.kill()"
  88                 except OSError:
  89                         # no such process, due to it already exiting...
  90                         pass
  91
  92                 #print o_value, e_value
  93                 return (o_value, e_value)
  94
  95         def runargs(self, args, timeout=COMMAND_TIMEOUT*2):
  96
  97                 #print "CMD.run(%s)" % " ".join(args)
  98                 s = Sopen(args, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True)
  99                 self.s = s
 100                 (f_in, f_out, f_err) = (s.stdin, s.stdout, s.stderr)
 101                 lout, lin, lerr = select([f_out], [], [f_err], timeout)
 102                 if len(lin) == 0 and len(lout) == 0 and len(lerr) == 0:
 103                         # Reached a timeout!  Nuke process so it does not hang.
 104                         s.kill(signal.SIGKILL)
 105                         raise ExceptionTimeout("TIMEOUT Running: %s" % cmd)
 106                 o_value = f_out.read()
 107                 e_value = ""
 108                 if o_value == "":       # An error has occured
 109                         e_value = f_err.read()
 110
 111                 o_value = o_value.strip()
 112                 e_value = e_value.strip()
 113
 114                 f_out.close()
 115                 f_in.close()
 116                 f_err.close()
 117                 try:
 118                         s.kill()
 119                 except OSError:
 120                         # no such process, due to it already exiting...
 121                         pass
 122
 123                 return (o_value, e_value)
 124
 125
 126 class SSH(CMD):
 127         def __init__(self, user, host, port=22, options = ssh_options):
 128                 self.options = options
 129                 self.user = user
 130                 self.host = host
 131                 self.port = port
 132                 return
 133
 134         def __options_to_str(self):
 135                 options = ""
 136                 for o,v in self.options.iteritems():
 137                         options = options + "-o %s=%s " % (o,v)
 138                 return options
 139
 140         def run(self, cmd, timeout=COMMAND_TIMEOUT*2):
 141                 cmd = "ssh -p %s %s %s@%s '%s'" % (self.port, self.__options_to_str(),
 142                                                                         self.user, self.host, cmd)
 143                 #print "SSH.run(%s)" % cmd
 144                 return CMD.run(self, cmd, timeout)
 145
 146         def get_file(self, rmt_filename, local_filename=None):
 147                 if local_filename == None:
 148                         local_filename = "./"
 149                 cmd = "scp -P %s -B %s %s@%s:%s %s" % (self.port, self.__options_to_str(),
 150                                                                         self.user, self.host,
 151                                                                         rmt_filename, local_filename)
 152                 # output :
 153                 #       errors will be on stderr,
 154                 #   success will have a blank stderr...
 155                 return CMD.run_noexcept(self, cmd)
 156
 157         def run_noexcept(self, cmd):
 158                 cmd = "ssh -p %s %s %s@%s '%s'" % (self.port, self.__options_to_str(),
 159                                                                         self.user, self.host, cmd)
 160                 #print "SSH.run_noexcept(%s)" % cmd
 161                 return CMD.run_noexcept(self, cmd)
 162
 163         def run_noexcept2(self, cmd, timeout=COMMAND_TIMEOUT*2):
 164                 cmd = "ssh -p %s %s %s@%s %s" % (self.port, self.__options_to_str(),
 165                                                                         self.user, self.host, cmd)
 166                 #print "SSH.run_noexcept2(%s)" % cmd
 167                 r = CMD.run_noexcept(self, cmd, timeout)
 168
 169                 # XXX: this may be resulting in deadlocks... not sure.
 170                 #if self.s.returncode is None:
 171                 #       #self.s.kill()
 172                 #       self.s.kill(signal.SIGKILL)
 173                 #       self.s.wait()
 174                 #       self.ret = self.s.returncode
 175                 self.ret = -1
 176
 177                 return r
 178
 179         def system2(self, cmd, timeout=COMMAND_TIMEOUT*2):
 180                 cmd = "ssh -p %s %s %s@%s %s" % (self.port, self.__options_to_str(),
 181                                                                         self.user, self.host, cmd)
 182                 #print "SSH.system2(%s)" % cmd
 183                 return CMD.system(self, cmd, timeout)
 184
 185         def runE(self, cmd):
 186                 cmd = "ssh -p %s %s %s@%s '%s'" % (self.port, self.__options_to_str(),
 187                                                                         self.user, self.host, cmd)
 188                 if ( DEBUG == 1 ):
 189                         print cmd,
 190                 (f_in, f_out, f_err) = os.popen3(cmd)
 191
 192                 value = f_out.read()
 193                 if value == "": # An error has occured
 194                         value = f_err.read()
 195                         value = value.strip()
 196
 197                 if ( DEBUG == 1 ):
 198                         print " == %s" % value
 199                 f_out.close()
 200                 f_in.close()
 201                 f_err.close()
 202                 return value.strip()
 203
 204 class MyTimer:
 205         def __init__(self):
 206                 self.start = time.time()
 207
 208         def end(self):
 209                 self.end = time.time()
 210                 t = self.end-self.start
 211                 return t
 212
 213         def diff(self):
 214                 self.end = time.time()
 215                 t = self.end-self.start
 216                 self.start = self.end
 217                 return t