HskPacketRetriever.py

#!/usr/local/bin/python
#
#                               Copyright 2004
#                                     by
#                        The Board of Trustees of the
#                     Leland Stanford Junior University.
#                            All rights reserved.
#

__facility__ = "Online"
__abstract__ = "GLAST LAT Housekeeping server infrastructure"
__author__   = "Jim Panetta <panetta@slac.stanford.edu> SLAC - GLAST I&T"
__date__     = "07/28/04"
__version__  = "$Revision: 1.2 $"
__release__  = "$Name: R04-12-00 $"
__credits__  = "SLAC"

import LATTE.copyright_SLAC
import time

from LATTE.monitoring.Retriever        import Retriever
from LATTE.monitoring.Trendable        import Trendable
from LATTE.monitoring.HskPacketDecoder import packetFactory
import time

class HskPacketRetriever(Retriever):
  """Retrieve HSK ccsds packets from ethernet connection
  """
  def __init__(self, hskCli):
    Retriever.__init__(self)
    self.__client = hskCli
    
  def retrievePacket(self):
    packet = []
    (err, payload) = self.__client.readTelem()
    if err == 0:
      hskClass = packetFactory(payload)
    else:
      print "got an error from readTelem: %d", err
      return None
    
    # create the packet
    
    # kludge up the timestamp, as the returned timestamp from HSK relative to VxWorks boot
    # timestamp = hskClass.seconds() + hskClass.subSeconds()/10000000
    timestamp = time.time()  # time() returns seconds since epoch, UTC
    
    for mnem, tag in hskClass.mnemList:
      value = hskClass.__dict__[mnem]
      packet.append( Trendable( mnem, timestamp, { 'Raw Value' : value } ) )
    return packet
    

  

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