#!/usr/bin/env python
#
# Copyright 2016 AT&T Intellectual Property, Inc
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# What this is: Monitor and closed-loop policy agent as part of the OPNFV VES 
# vHello_VES demo. 
#
# Status: this is a work in progress, under test.

import time

report_time = ""
request_rate = ""
app_state = ""

with open('/home/ubuntu/ves.log') as f:
  while True:
    line = f.readline()
    if line:
#        print "line: ", line,

      if "lastEpochMicrosec" in line:
#0....5....1....5....2....5....3....5....4....5....5
#            "lastEpochMicrosec": 1476552393091008,
# Note: the above is expected, but sometimes it's in a different position or
# corrupted with other output for some reason...

        fields = line.split( )
        e = fields[1][0:-1]
        if e.isdigit():
#          print "report_time: ", e, "\n"
          report_time = time.strftime('%Y-%m-%d %H:%M:%S', 
            time.localtime(int(e)/1000000))

      if "requestRate" in line:
#....5....1....5....2....5....3....5
#            "requestRate": 2264,
        request_rate = line[27:-2]
        print '{0} app state: {1}\trequest rate: {2}'.format(
          report_time, app_state, request_rate)

      if "\"specificProblem\": \"Started\"" in line:
        app_state = "Started"
        print '{0} app state change: Started'.format(report_time)

      if "\"specificProblem\": \"Stopped\"" in line:
        app_state = "Stopped"
        print '{0} app state change: Stopped'.format(report_time)