def __clientRPC(self, function, params, conn_time=1.0, resp_time=5.0):
"""
internal library for pvAccess channel RPC.
conn_time: waiting time for connection, 1.0 by default;
resp_time: waiting time for response, 5.0 by default
"""
alarm = Alarm()
timeStamp = TimeStamp()
ntnv = NTNameValue(function, params)
# now do issue + wait
channelRPC = ChannelRPC(self.channelname)
channelRPC.issueConnect()
if not channelRPC.waitConnect(conn_time):
#print channelRPC.getMessage()
raise Exception(channelRPC.getMessage())
channelRPC.issueRequest(ntnv.getNTNameValue(), False)
result = channelRPC.waitResponse(resp_time)
if result is None:
#print channelRPC.getMessage()
raise Exception(channelRPC.getMessage())
if function in ["retrieveSnapshot", "getLiveMachine", "saveSnapshot"]:
result = NTMultiChannel(result)
elif function in [
"retrieveServiceEvents", "retrieveServiceConfigs",
"retrieveServiceConfigProps"
]:
result = NTTable(result)
elif function == "updateSnapshotEvent":
result = NTScalar(result)
result.getAlarm(alarm)
result.getTimeStamp(timeStamp)
return result
