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#!/usr/bin/env python3
# Copyright 2017 AT&T Intellectual Property, Inc. All rights reserved.
#
# 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.
#
# Author Gokul Singaraju gs244f@att.com
# Simple Microservice
# Tracks Heartbeat messages on input topic in DMaaP
# and generates Missing Heartbeat signal for Policy Engine
import requests
import math
import sched, datetime, time
import json
import string
import sys
# Initialise tracking hash tables
intvl = 60
missing_htbt = 2
#tracks last epoch time
hearttrack = {}
#tracks sequence number
heartstate = {}
#tracks sequence number differences
heartflag = {}
#saves heartbeat message for policy
heartmsg = {}
mr_url = 'http://mrrouter.onap.org:3904'
pol_url = 'http://mrrouter.onap.org:3904'
intopic = 'VESCOLL-VNFNJ-SECHEARTBEAT-OUTPUT'
outopic = 'POLICY-HILOTCA-EVENT-OUTPUT'
nfc = "vVNF"
cl_loop = 'ControlLoopEvent1'
periodic_scheduler = None
# Checks for heartbeat event on periodic basis
class PeriodicScheduler(object):
def __init__(self):
self.scheduler = sched.scheduler(time.time, time.sleep)
def setup(self, interval, action, actionargs=()):
#print("Args are :", locals())
action(*actionargs)
self.scheduler.enter(interval, 1, self.setup,(interval, action, actionargs))
def run(self):
self.scheduler.run()
def stop(self):
list(map(self.scheduler.cancel, self.scheduler.queue))
# Process the heartbeat event on input topic
def periodic_event():
global periodic_scheduler
global mr_url, pol_url, missing_htbt, intvl, intopic, outopic, nfc, cl_loop
ret = 0
#print("Args are :", locals())
print("{0} Checking...".format(datetime.datetime.now()))
#Read heartbeat
#get_url = mr_url+'/events/'+intopic+'/DefaultGroup/1?timeout=15000'
get_url = mr_url+'/DefaultGroup/1?timeout=15000'
print("Getting :"+get_url)
try:
res = requests.get(get_url)
#print(res)
#print(res.headers)
print(res.text)
#print(res.json)
inputString = res.text
#jlist = json.loads(inputString)
jlist = inputString.split('\n');
#print("List:"+jlist[0])
# Process the DMaaP input message retreived
for line in jlist:
print("Line:"+line)
try:
jobj = json.loads(line)
except ValueError:
print('Decoding JSON has failed')
continue
#print(jobj)
srcid = (jobj['event']['commonEventHeader']['sourceId'])
lastepo = (jobj['event']['commonEventHeader']['lastEpochMicrosec'])
seqnum = (jobj['event']['commonEventHeader']['sequence'])
nfcode = (jobj['event']['commonEventHeader']['nfNamingCode'])
if( nfcode and nfc != nfcode):
continue
if( srcid in hearttrack ):
tdiff = lastepo - hearttrack[srcid]
sdiff = seqnum - heartstate[srcid]
print("Existing source time diff :"+str(tdiff)+" seqdiff :"+str(sdiff))
# check time difference is within limits and seq num is less than allowed
if((0 <= tdiff <= 61000000) and sdiff < missing_htbt):
print("Heartbeat Alive...")
hearttrack[srcid] = lastepo
heartstate[srcid] = seqnum;
heartflag[srcid] = sdiff;
heartmsg[srcid] = jobj;
else:
jobj["internalHeaderFields"] = json.dumps({
"closedLoopFlag": "True",
"eventTag": "hp.Heartbeat Service.20171022.8447964515",
"collectorTimeStamp": "Sun, 10 22 2017 03:04:27 GMT",
"lastDatetime": "Sun, 22 Oct 2017 03:06:32 +0000",
"closedLoopControlName": cl_loop,
"firstDatetime": "Sun, 22 Oct 2017 03:06:32 +0000"
});
heartmsg[srcid] = jobj;
payload = heartmsg[srcid]
print(payload)
#psend_url = pol_url+'/events/'+outopic+'/DefaultGroup/1?timeout=15000'
psend_url = pol_url+'/DefaultGroup/1?timeout=15000'
print(psend_url)
print("Heartbeat Dead raising alarm event "+psend_url)
#Send response for policy on output topic
r = requests.post(psend_url, data=payload)
print(r.status_code, r.reason)
ret = r.status_code
del heartstate[srcid]
del hearttrack[srcid]
del heartflag[srcid]
else:
print("Adding new source")
hearttrack[srcid] = lastepo
heartstate[srcid] = seqnum
heartflag[srcid] = 1
heartmsg[srcid] = jobj;
ret = 1
chkeys = []
for key in heartstate.keys():
print(key,heartstate[key])
if( heartflag[key] == 0 ):
print("Heartbeat Dead raise alarm event"+key)
chkeys.append( key )
#print payload
heartmsg[key]["internalHeaderFields"] = json.dumps({
"closedLoopFlag": "True",
"eventTag": "hp.Heartbeat Service.20171022.8447964515",
"collectorTimeStamp": "Sun, 10 22 2017 03:04:27 GMT",
"lastDatetime": "Sun, 22 Oct 2017 03:06:32 +0000",
"closedLoopControlName": cl_loop,
"firstDatetime": "Sun, 22 Oct 2017 03:06:32 +0000"
})
payload = heartmsg[key]
print(payload)
send_url = pol_url+'/DefaultGroup/1?timeout=15000'
print(send_url)
r = requests.post(send_url, data=payload)
print(r.status_code, r.reason)
ret = r.status_code
heartflag[key] = 0
for chkey in chkeys:
print(chkey)
del heartstate[chkey]
del hearttrack[chkey]
del heartflag[chkey]
except requests.exceptions.ConnectionError:
print("Connection refused ..")
return ret
#test setup for coverage
def test_setup(args):
global mr_url, pol_url, missing_htbt, intvl, intopic, outopic
missing_htbt = float(int(args[2]))
intvl = float(int(args[3]))
intopic = args[4]
outopic = args[5]
mr_url = get_collector_uri()+'/events/'+intopic
pol_url = get_policy_uri()+'/events/'+outopic
print ("Message router url %s " % mr_url)
print ("Policy url %s " % pol_url)
print ("Interval %s " % intvl)
print ("Input topic %s " % intopic)
print ("Output topic %s " % outopic)
#intvl = 60 # every second
#Main invocation
def main(args):
global periodic_scheduler
global mr_url, pol_url, missing_htbt, intvl, intopic, outopic, nfc, cl_loop
#mr_url = get_collector_uri()
#pol_url = get_policy_uri()
mr_url = args[0]
intopic = args[1]
pol_url = args[2]
outopic = args[3]
nfc = args[4]
missing_htbt = int(args[5])
intvl = int(args[6])
cl_loop = args[7]
print ("Message router url %s " % mr_url)
print ("Policy router url %s " % pol_url)
print ("VNF %s " % nfc)
print ("Interval %s " % intvl)
if( cl_loop != "internal_test") :
#intvl = 60 # every second
#Start periodic scheduler runs every interval
periodic_scheduler = PeriodicScheduler()
periodic_scheduler.setup(intvl, periodic_event,) # it executes the event just once
periodic_scheduler.run() # it starts the scheduler
if __name__ == "__main__":
total = len(sys.argv)
cmdargs = str(sys.argv)
print ("The total numbers of args passed to the script: %d " % total)
print ("Missing Heartbeat Args list: %s " % cmdargs)
print ("Script name: %s" % str(sys.argv[0]))
for i in range(total):
print ("Argument # %d : %s" % (i, str(sys.argv[i])))
main(sys.argv[1:])
#force stop scheduler
def stop():
global periodic_scheduler
if not periodic_scheduler is None:
periodic_scheduler.stop()
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