sface/sfiprocess.py

   1
   2 import os
   3 import sys
   4 import time
   5
   6 from PyQt4.QtCore import *
   7 from sface.config import config
   8 from sface.xmlrpcwindow import XmlrpcTracker
   9
  10 def find_executable(exec_name):
  11     """find the given executable in $PATH"""
  12     paths = os.getenv("PATH").split(':')
  13     for p in paths:
  14         exec_path = os.path.join(p, exec_name)
  15         if os.path.exists(exec_path):
  16             return exec_path
  17     return None
  18
  19
  20 class SfiProcess(QObject):
  21     def __init__(self, parent=None):
  22         QObject.__init__(self, parent)
  23
  24         env = QProcess.systemEnvironment()
  25         env << "PYTHONPATH=%s" % ":".join(sys.path)
  26         self.process = QProcess()
  27         self.process.setEnvironment(env)
  28         self.connect(self.process, SIGNAL("finished(int, QProcess::ExitStatus)"),
  29                      self.processFinished)
  30
  31         self.xmlrpctracker = XmlrpcTracker()
  32
  33         # holds aggregate output from processStandardOutput(); used by xmlrpc
  34         # tracker.
  35         self.output = ""
  36
  37         self.connect(self.process, SIGNAL("readyReadStandardOutput()"),
  38                      self.processStandardOutput)
  39         self.connect(self.process, SIGNAL("readyReadStandardError()"),
  40                      self.processStandardError)
  41
  42     def __init_command(self, args):
  43         self.args = QStringList()
  44         if config.debug:
  45             # this shows xmlrpc conversation, see sfi.py docs.
  46             self.args << QString('-D')
  47         for arg in args:
  48             self.args << QString(arg)
  49
  50         self.exe = find_executable("sfi.py")
  51         if not self.exe:
  52             print "FATAL.. Could not locate binary sfi.py - not much we can do without that"
  53
  54     def isRunning(self):
  55         return self.process.state() != QProcess.NotRunning
  56
  57     def processStandardOutput(self):
  58         output = self.process.readAllStandardOutput()
  59         self.output = self.output + output
  60         if config.debug:
  61             print output
  62
  63     def processStandardError(self):
  64         print self.process.readAllStandardError()
  65
  66     def processFinished(self):
  67         if self.process.exitStatus() == QProcess.CrashExit:
  68             print self.readOutput()
  69             print "Process exited with errors:",
  70             err = self.process.error()
  71             if err == QProcess.FailedToStart:
  72                 print "FailedToStart"
  73             elif err == QProcess.Crashed:
  74                 print "Crashed"
  75             elif err == QProcess.Timedout:
  76                 print "Timedout"
  77             elif err == QProcess.WriteError:
  78                 print "WriteError"
  79             elif err == QProcess.ReadError:
  80                 print "ReadError"
  81             elif err == QProcess.UnknownError:
  82                 print "UnknownError"
  83         self.trace_end()
  84         self.emit(SIGNAL("finished()"))
  85
  86     def __getRSpec(self, mgr):
  87         slice = config.getSlice()
  88         # Write RSpec to file for testing.
  89         filename = os.path.expanduser("~/.sfi/" + slice + ".rspec")
  90         try:
  91             os.remove(filename)
  92         except:
  93             pass
  94         args = ["-u", config.getUser(), "-a", config.getAuthority(),
  95                 "-r", config.getRegistry(), "-s", mgr, "resources",
  96                 "-o", filename, slice]
  97
  98         self.__init_command(args)
  99         self.start()
 100         return filename
 101
 102     def getRSpecFromSM(self):
 103         return self.__getRSpec(config.getSlicemgr())
 104
 105 #    def getRSpecFromAM(self):
 106 #        return self.__getRSpec(config.getAggmgr())
 107
 108     def getRecord(self, hrn, filename=None):
 109         args = ["-u", config.getUser(), "-a", config.getAuthority(),
 110                 "-r", config.getRegistry(), "-s", config.getSlicemgr(), "show", hrn]
 111         if filename:
 112             args.append("-o")
 113             args.append(filename)
 114         self.__init_command(args)
 115         self.start()
 116
 117     def applyRSpec(self, rspec):
 118         filename = config.getSliceRSpecFile() + "_new"
 119         rspec.save(filename)
 120         args = ["-u", config.getUser(), "-a", config.getAuthority(),
 121                 "-r", config.getRegistry(), "-s", config.getSlicemgr(), "create",
 122                 config.getSlice(), filename]
 123         self.__init_command(args)
 124         self.start()
 125         return filename
 126
 127     def updateRecord(self, filename):
 128         args = ["-u", config.getUser(), "-a", config.getAuthority(),
 129                 "-r", config.getRegistry(), "-s", config.getSlicemgr(), "update", filename]
 130         self.__init_command(args)
 131         self.start()
 132
 133     def renewSlivers(self, expiration):
 134         args = ["-u", config.getUser(), "-a", config.getAuthority(),
 135                 "-r", config.getRegistry(), "-s", config.getSlicemgr(), "renew",
 136                 config.getSlice(), expiration]
 137         self.__init_command(args)
 138         self.start()
 139
 140     def start(self):
 141         self.output = ""
 142         self.trace_command()
 143         self.process.start(self.exe, self.args)
 144
 145     def readOutput(self):
 146         if self.process.state() == QProcess.NotRunning:
 147             return self.process.readAll()
 148
 149     def trace_command (self):
 150         if config.verbose:
 151             self._trace=time.time()
 152             command = "%s %s" % (self.exe, self.args.join(" "))
 153             print time.strftime('%H:%M:%S'),'Invoking',command
 154
 155     def trace_end (self):
 156         if config.verbose:
 157 #            command = "%s %s" % (self.exe, self.args.join(" "))
 158             print time.strftime('%H:%M:%S'),"Done [%.3f s]"%(time.time()-self._trace)
 159         if config.debug:
 160             self.xmlrpctracker.getAndPrint(self.output)
 161