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trafficlight.py
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trafficlight.py
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from flask import Flask, request # create custom server
from functools import partial # for registering routes
import random # generate random data for speed
import requests # send http requests
import json
import time
import csv # log data
THRESHOLD_VALUE = 300 # point at which load balancing is required
LOG_FILE_NAME = "log.csv"
ACK = "ACK"
registered_routes = {}
def register_route(route=None):
"""
Create the decorator to allow us to
register routes in the subclass of Flask
"""
def inner(fn):
registered_routes[route] = fn
return fn
return inner
"""
TEMPLATE FOR A STATE JSON:
state = {
'active_siblings' : []
'inactive_siblings' : []
'parents' : []
'children' : []
'aspects' : {
'request_count':
}
'port' :
}
"""
class TrafficLight(Flask):
"""
Custom Server inheriting from Flask
"""
def __init__(self, name, port, state, speed_limit):
self.port = port
self.state = state
self.speed_limit = speed_limit
self.vehicle_set = set()
Flask.__init__(self, name)
# register routes
for route, fn in registered_routes.items():
partial_fn = partial(fn, self)
partial_fn.__name__ = fn.__name__
self.route(route)(partial_fn)
def divide(self, number_of_additions):
"""
Execute the divide operation is of our coordination model
"""
# keeps track of number of messages sent
no_of_messages = 0
# list all the siblings to activate
siblings_to_add = []
for sib in self.state['inactive_siblings'][:number_of_additions]:
siblings_to_add.append(sib)
# update state json
self.state['inactive_siblings'].remove(sib)
self.state['active_siblings'].append(sib)
# send activation requests to list of siblings
payload = self.state
for s_url in siblings_to_add:
# updates the message count
no_of_messages += 1
ret = requests.get(s_url + 'service_coordination/notify_divide',
params={'json':json.dumps(payload)})
if ret:
print("Successfully sent divide notification {}".format(s_url))
else:
print("Couldn't send divide notification to {}".format(s_url))
children = self.state['children']
parents = self.state['parents']
payload = {'active_siblings':self.state['active_siblings'],
'port':self.port}
# notify the divide operation to parent
for url in parents:
ret = requests.get(url + 'service_coordination/notify_divide',
params={'json':json.dumps(payload)})
# if not ret:
# print("Divide broadcast not sent to {} with error code = {}".format(url,ret))
# else:
# # updates the message count
# no_of_messages += 1
# notify the divide operation to children
for url in children:
for id in self.vehicle_set:
ret = requests.get(url + 'service_coordination/notify_divide',
params={'json':json.dumps(payload)})
if not ret:
print("Divide broadcast not sent to {} with error code = {}".format(url,ret))
else:
# updates the message count
no_of_messages += 1
return no_of_messages
@register_route('/recv_data/')
def recv_data(self):
"""
Recieve data from vehicles about their ID and speed
"""
self.state['aspects']['request_count'] += 1
# call divide if threshold has been reached
if (self.state['aspects']['request_count'] > THRESHOLD_VALUE and
len(self.state['inactive_siblings'])):
time_before_division = time.time()
no_of_messages = self.divide(1)
self.vehicle_set = set()
self.state['aspects']['request_count'] = 0
time_after_division = time.time()
elapsed_time = time_after_division - time_before_division
# logs information into file
try:
row = [self.port, time_before_division, elapsed_time, no_of_messages]
with open('log.csv', 'a') as csv_file:
writer = csv.writer(csv_file)
writer.writerow(row)
except IOError:
print("IOError")
payload = json.loads(request.args['json'])
self.vehicle_set.add(payload['id'])
# if vehicle is speeding, notify the authorities
if payload['speed'] > self.speed_limit:
# print("Speed of {} is too fast".format(payload['speed']))
# select a random parent out of the list and send the data to it
parent_index = random.randint(0, len(self.state['parents'])-1)
ret = requests.get(self.state['parents'][parent_index]+'recv_data/',
params={'json':json.dumps(payload)})
if ret:
print("Data about vehicle {} successfully sent to {}.".format(payload['id'],
self.state['parents'][parent_index]))
else:
print("Data about vehicle {} couldn't be sent to {}".format(payload['id'],
self.state['parents'][parent_index]))
else:
print("Good speed of {}".format(payload['speed']))
print("Counter: ", str(self.state['aspects']['request_count']))
return ACK
@register_route('/service_coordination/notify_divide')
def divide_request(self):
"""
handle the divide notification that might come from
a sibling, parent or child
"""
payload = json.loads(request.args['json'])
url = 'http://' + request.remote_addr + ':' + str(payload['port']) + '/'
if self.state is None:
# load the state from the present serving membrane
self.state = payload
self.state['port'] = self.port
self.state['aspects']['request_count'] = 0
else:
# update states according to the sender type
if url in self.state['parents']:
self.state['parents'] = payload['active_siblings']
elif url in self.state['children']:
self.state['children'] = payload['active_siblings']
elif url in self.state['active_siblings']:
self.state = payload
self.state['port'] = self.port
self.state['aspects']['request_count'] = 0
return ACK