source: tmcsimulator/trunk/src/python/unifiedlogger/cms_watcher.py @ 549

import json, time

from copy import deepcopy



# CMS Message Watcher

# Look for changes in the CMS message file

# jdalbey  7/6/2019

idList = []    # list of CMS ID's

prevList = []  # previous messages

currList = []  # current messages

locationMap = {} # map of CMS ID's to locations



# Utility functions

def isEmpty(cmsitem):

     return cmsitem == ":::::"

def isFull(cmsitem):

     return not isEmpty(cmsitem)



# Read the cms message file

def readFile():     

     with open ("webapps/dynamicdata/cms_messages.json",'r') as myfile:

          jsonData=myfile.read()

 

     return json.loads(jsonData)['data']



# Read the static file of cms locations and create a lookup map

def loadLocations():

     with open ("webapps/cptms/data_layers/cms_locations_D12.gjson",'r') as myfile:

          jsonData=myfile.read()

 

     list = json.loads(jsonData)['features']

     # add each item to a lookup map

     for item in list:

          locationMap [item['id']] = item['properties']['location'] + " " + item['properties']['street']

     

# Setup the ID list and initialize the previous messages to empty

def initialize():

     loadLocations()

     msgList = readFile()

     global prevList, idList

     for idx in range(0,len(msgList)):

          idList.append(msgList[idx]['cms']['index'])

          prevList.append(":::::")

     return msgList



# Extract the current messages into a list

def extractMessages(msgList):

     global currList

     currList = []

     for idx in range(0,len(msgList)):

          currList.append(

                    msgList[idx]['cms']['message']['phase1']['Line1'] + ':' + 

                    msgList[idx]['cms']['message']['phase1']['Line2'] + ':' +

                    msgList[idx]['cms']['message']['phase1']['Line3'] + ':' +

                    msgList[idx]['cms']['message']['phase2']['Line1'] + ':' +

                    msgList[idx]['cms']['message']['phase2']['Line2'] + ':' +

                    msgList[idx]['cms']['message']['phase2']['Line3'])



def setup():

     extractMessages(initialize())



# compare previous messages to current messages to look for changes

def getLogEntries():

     global prevList, currList

     msgList = readFile()

     extractMessages(msgList)

     size = len(currList)

     

     results = []

     # Consider each CMS message

     for idx in range(0,size):

          # Is a new message activated?

          if isEmpty(prevList[idx]) and isFull(currList[idx]):

               results.append("CMS Activated," + locationMap[idList[idx]] + ", '" + currList[idx] +"'")

          # Is an existing message turned off?

          if isEmpty(currList[idx]) and isFull(prevList[idx]):

               results.append("CMS Deactivated, " + locationMap[idList[idx]])

          # Did a message change?

          if isFull(currList[idx]) and isFull(prevList[idx]) and currList[idx] != prevList[idx]:

               results.append("CMS Updated, " + locationMap[idList[idx]] + ", '" + currList[idx] +"'")



     # Save the current list as previous

     prevList = deepcopy(currList)

     return results



# Local main for unit testing

def main():

     global currList

     setup()

     # Loop Forever

     while True:

          # Look for changed messages

          answer = getLogEntries()

          # Output results

          for item in answer:

               print item

          # wait 

          time.sleep(5)

          # Get the current messages

          extractMessages(readFile())



if __name__ == "__main__":

     main()