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         self.process = QProcess()
  25         self.connect(self.process, SIGNAL("finished(int, QProcess::ExitStatus)"),
  26                      self.processFinished)
  27
  28         self.xmlrpctracker = XmlrpcTracker()
  29         # in case self.output is read by the XmlrpcTracker before any
  30         # readyReadStandardOutput signal
  31         self.output = ''
  32
  33         self.connect(self.process, SIGNAL("readyReadStandardOutput()"),
  34                      self.processStandardOutput)
  35         self.connect(self.process, SIGNAL("readyReadStandardError()"),
  36                      self.processStandardError)
  37
  38     def __init_command(self, args):
  39         self.args = QStringList()
  40         print "DEBUG FLAG:", config.debug
  41         if config.debug:
  42             # this shows xmlrpc conversation, see sfi.py docs.
  43             self.args << QString('-D')
  44         for arg in args:
  45             self.args << QString(arg)
  46
  47         self.exe = find_executable("sfi.py")
  48         if not self.exe:
  49             print "FATAL.. Could not locate binary sfi.py - not much we can do without that"
  50
  51     def isRunning(self):
  52         return self.process.state() != QProcess.NotRunning
  53
  54     def processStandardOutput(self):
  55         # NOTE: The signal readyReadStandardOutput is emitted when
  56         # the process has made new data available through its standard output channel.
  57         # But the process is not necessarily finished.
  58         # It's cool to have this method wo we print the stdOut live,
  59         # but we must be carefull with self.output, used by XmlrpcTracker too.
  60         tmpOut = self.process.readAllStandardOutput()
  61         print "STDOUT READY"
  62         if config.debug:
  63             print tmpOut
  64         self.output += tmpOut
  65
  66     def processStandardError(self):
  67         print self.process.readAllStandardError()
  68
  69     def processFinished(self):
  70         if self.process.exitStatus() == QProcess.CrashExit:
  71             print self.readOutput()
  72             print "Process exited with errors:",
  73             err = self.process.error()
  74             if err == QProcess.FailedToStart:
  75                 print "FailedToStart"
  76             elif err == QProcess.Crashed:
  77                 print "Crashed"
  78             elif err == QProcess.Timedout:
  79                 print "Timedout"
  80             elif err == QProcess.WriteError:
  81                 print "WriteError"
  82             elif err == QProcess.ReadError:
  83                 print "ReadError"
  84             elif err == QProcess.UnknownError:
  85                 print "UnknownError"
  86         self.trace_end()
  87         self.emit(SIGNAL("finished()"))
  88
  89     def __getRSpec(self, mgr):
  90         slice = config.getSlice()
  91         # Write RSpec to file for testing.
  92         filename = os.path.expanduser("~/.sfi/" + slice + ".rspec")
  93         try:
  94             os.remove(filename)
  95         except:
  96             pass
  97         args = ["-u", config.getUser(), "-a", config.getAuthority(),
  98                 "-r", config.getRegistry(), "-s", mgr, "resources",
  99                 "-o", filename, slice]
 100
 101         self.__init_command(args)
 102         self.start()
 103         return filename
 104
 105     def getRSpecFromSM(self):
 106         return self.__getRSpec(config.getSlicemgr())
 107
 108     def getRSpecFromAM(self):
 109         return self.__getRSpec(config.getAggmgr())
 110
 111     def getRecord(self, hrn):
 112         args = ["-u", config.getUser(), "-a", config.getAuthority(),
 113                 "-r", config.getRegistry(), "-s", config.getSlicemgr(), "show", hrn]
 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 start(self):
 128         self.trace_command()
 129         self.process.start(self.exe, self.args)
 130
 131     def readOutput(self):
 132         if self.process.state() == QProcess.NotRunning:
 133             return self.process.readAll()
 134
 135     def trace_command (self):
 136         if config.verbose:
 137             self._trace=time.time()
 138             command = "%s %s" % (self.exe, self.args.join(" "))
 139             print time.strftime('%M:%S'),'Invoking',command
 140
 141     def trace_end (self):
 142         if config.verbose:
 143             command = "%s %s" % (self.exe, self.args.join(" "))
 144             print time.strftime('%M:%S'),"[%.3f s]"%(time.time()-self._trace),command,'Done'
 145             self.xmlrpctracker.getAndPrint(self.output)
 146