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simcomm.py
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#!/usr/bin/env python3
import sys
import socket
import random
from time import sleep
from struct import pack, unpack
from threading import Thread
from rtu import RTU, RTU_SOURCE, RTU_TRANSMISSION, RTU_LOAD, RTU_TYPES
if sys.platform[:3] == 'win':
print('Intended to be executed in a mininet Linux environment.')
raise RuntimeError()
try:
from pyroute2 import IPDB
except ImportError:
print('Dependency missing: pip install pyroute2')
sys.exit(1)
ip = IPDB()
SIM_BCAST = ip.interfaces[[x for x in ip.interfaces if ip.interfaces[x]['state'] == 'up' and isinstance(x, str) and str(x) != 'lo'][0]].ipaddr[0]['broadcast']
ip.release()
del ip
SIM_PORT = 20202 # UDP port used for the simulation information exchange between the different RTUs
BUFFER_SIZE = 512
DATA_FMT = '<IIIIIff' # Sender-ID Receiver-ID Message-ID IARG-0 IARG-1 FARG-0 FARG-1
# Message ID
MSG_WERE = 0
MSG_ISAT = 1
MSG_GETV = 2
MSG_VOLT = 3
MSG_GREQ = 4
MSG_TREQ = 5
MSG_UKWN = 99
class ClassTypeMismatch(Exception):
pass
class SimulationHandler(Thread):
def __init__(self, rtu):
super(SimulationHandler, self).__init__()
if rtu is None or rtu.__class__.__name__ not in ['Load', 'Transmission', 'Source'] or not isinstance(rtu, RTU):
raise AttributeError()
self.__rtu = rtu
self.__terminate = False
self.__sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) # Use UDP
if sys.platform not in ['win32']:
self.__sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1) # Enable port reusage pylint: disable=no-member
self.__sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # Enable address reuse
self.__sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1) # Enable broadcast
self.__sock.bind(('', SIM_PORT))
self.__sock.settimeout(0.333)
self.__laddr = None
self.__raddr = None
@property
def terminate(self) -> bool:
return self.__terminate
@terminate.setter
def terminate(self, value: bool):
self.__terminate = value
def who_has_left(self):
count = 0
while not self.__terminate and self.__laddr is None:
try:
# if (count % 10) == 0:
data = pack(DATA_FMT, self.__rtu.guid, self.__rtu.left, MSG_WERE, 0, 0, 0.0, 0.0)
self.__sock.sendto(data, (SIM_BCAST, SIM_PORT))
sleep(round(random.random(), 2))
data, addr = self.__sock.recvfrom(BUFFER_SIZE)
data = unpack(DATA_FMT, data)
if data[0] == self.__rtu.left:
self.__laddr = addr
elif data[2] == MSG_WERE and data[1] == self.__rtu.guid:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_ISAT, 0, 0, 0.0, 0.0)
self.__sock.sendto(data, addr)
except socket.timeout:
pass
count +=1
def who_has_right(self):
count = 0
while not self.__terminate and self.__raddr is None:
try:
# if (count % 10) == 0:
data = pack(DATA_FMT, self.__rtu.guid, self.__rtu.right, MSG_WERE, 0, 0, 0.0, 0.0)
self.__sock.sendto(data, (SIM_BCAST, SIM_PORT))
sleep(round(random.random(), 2))
data, addr = self.__sock.recvfrom(BUFFER_SIZE)
data = unpack(DATA_FMT, data)
if data[0] == self.__rtu.right:
self.__raddr = addr
elif data[2] == MSG_WERE and data[1] == self.__rtu.guid:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_ISAT, 0, 0, 0.0, 0.0)
self.__sock.sendto(data, addr)
except socket.timeout:
pass
count +=1
def vin_polling(self):
while not self.__terminate:
data = pack(DATA_FMT, self.__rtu.guid, self.__rtu.left, MSG_GETV, 0, 0, 0.0, 0.0)
self.__sock.sendto(data, self.__laddr)
sleep(0.5)
def rload_polling(self):
while not self.__terminate:
data = pack(DATA_FMT, self.__rtu.guid, self.__rtu.right, MSG_GREQ, 0, 0, 0.0, 0.0)
self.__sock.sendto(data, self.__raddr)
sleep(0.5)
def measurements(self):
last_state = None
while not self.__terminate:
if self.__rtu.state != last_state:
self.__rtu.calculate_load()
last_state = self.__rtu.state
if self.__rtu.load == float('inf'):
self.__rtu.vout = 0
self.__rtu.amp = 0
elif all(x is not None for x in [self.__rtu.vin, self.__rtu.load, self.__rtu.rload]):
load = self.__rtu.load
vin = self.__rtu.vin
rload = self.__rtu.rload
if rload == float('inf'):
self.__rtu.vout = vin
else:
self.__rtu.vout = vin * rload / (rload + load)
try:
self.__rtu.amp = vin / rload
except ZeroDivisionError:
self.__rtu.amp = float('inf')
sleep(0.333)
def run_source(self):
while not self.__terminate:
try:
data, addr = self.__sock.recvfrom(BUFFER_SIZE)
data = unpack(DATA_FMT, data)
if data[1] == self.__rtu.guid:
if data[2] == MSG_WERE:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_ISAT, 0, 0, 0.0, 0.0)
elif data[2] == MSG_GETV:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_VOLT, 0, 0, self.__rtu.voltage, 0.0)
elif data[2] == MSG_UKWN:
data = None
# sys.stderr.write('Received MSG_UKWN from {:s}\r\n'.format(addr[0]))
sys.stderr.flush()
else:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_UKWN, 0, 0, 0.0, 0.0)
if data is not None:
self.__sock.sendto(data, addr)
except socket.timeout:
pass
def run_transmission(self):
vpoller = Thread(target=self.vin_polling)
rpoller = Thread(target=self.rload_polling)
measure = Thread(target=self.measurements)
vpoller.start()
rpoller.start()
measure.start()
while not self.__terminate:
try:
data, addr = self.__sock.recvfrom(BUFFER_SIZE)
data = unpack(DATA_FMT, data)
if data[1] == self.__rtu.guid:
if data[2] == MSG_WERE:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_ISAT, 0, 0, 0.0, 0.0)
elif data[2] == MSG_GETV:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_VOLT, 0, 0, self.__rtu.vout, 0.0) if self.__rtu.vout is not None else None
elif data[2] == MSG_VOLT:
self.__rtu.vin = data[5]
data = None
elif data[2] == MSG_GREQ:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_TREQ, 0, 0, self.__rtu.load + self.__rtu.rload, 0.0) if all(x is not None for x in [self.__rtu.rload, self.__rtu.load]) else None
elif data[2] == MSG_TREQ:
self.__rtu.rload = data[5]
data = None
elif data[2] == MSG_UKWN:
data = None
# sys.stderr.write('Received MSG_UKWN from {:s}\r\n'.format(addr[0]))
sys.stderr.flush()
else:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_UKWN, 0, 0, 0.0, 0.0)
if data is not None:
self.__sock.sendto(data, addr)
except socket.timeout:
pass
vpoller.join()
rpoller.join()
measure.join()
def run_load(self):
vpoller = Thread(target=self.vin_polling)
vpoller.start()
while not self.__terminate:
try:
data, addr = self.__sock.recvfrom(BUFFER_SIZE)
data = unpack(DATA_FMT, data)
if data[1] == self.__rtu.guid:
if data[2] == MSG_WERE:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_ISAT, 0, 0, 0.0, 0.0)
elif data[2] == MSG_GREQ:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_TREQ, 0, 0, self.__rtu.load, 0.0)
elif data[2] == MSG_VOLT:
self.__rtu.vin = data[5]
data = None
elif data[2] == MSG_UKWN:
data = None
# sys.stderr.write('Received MSG_UKWN from {:s}\r\n'.format(addr[0]))
sys.stderr.flush()
else:
data = pack(DATA_FMT, self.__rtu.guid, data[0], MSG_UKWN, 0, 0, 0.0, 0.0)
if data is not None:
self.__sock.sendto(data, addr)
except socket.timeout:
pass
vpoller.join()
def run(self):
if self.__rtu.rtutype == RTU_SOURCE and self.__rtu.__class__.__name__ == 'Source':
self.run_source()
elif self.__rtu.rtutype == RTU_LOAD and self.__rtu.__class__.__name__ == 'Load':
self.who_has_left()
self.run_load()
elif self.__rtu.rtutype == RTU_TRANSMISSION and self.__rtu.__class__.__name__ == 'Transmission':
self.who_has_left()
self.who_has_right()
self.run_transmission()
else:
raise ClassTypeMismatch()
self.__sock.close()