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ClientSocket_RUDP.py
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ClientSocket_RUDP.py
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import pickle
import random
import socket
import struct
import time
from threading import Thread
class ClientSocket:
def __init__(self, server_ip, server_port):
# ----------------------------------------------------------------- #
# Init Client Socket #
# ----------------------------------------------------------------- #
self.client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # create client socket
self.server_addr = (server_ip, server_port) # set server address
self.buffer_size = 4096 # set the buffer size
self.client_source_port = 20075
self.conn_flag = False # is connected to server?
# set the size of the receive and send windows sliders
self.recv_window_size = 5
self.recv_window = []
self.send_window_size = 5
self.send_window = []
# set the sequence and acknowledgment numbers
self.seq_no = random.randint(2, 1 * (10 ** 4)) # random sequence number
self.ack_no = 1
# initialize variables related to ARQ
self.last_ack_time = time.time()
self.last_packet_time = 0
self.last_packet_sent = None
self.timeout = 10 # set timeout to 10 seconds
self.retransmission = self.timeout / 3 # time pending before retransmission of packet
self.timeout_flag = False
# initialize thread-related variables
self.threads = []
self.table_list = []
self.curr_table = None
self.curr_value = ""
# ----------------------------------------------------------------- #
# Socket related Section #
# ----------------------------------------------------------------- #
# start the client socket
def start(self):
print(f"[+] Establishing connection with the server at {self.server_addr}")
# try bind source port to client (would work only with the first client or if he disconnects)
try:
self.client_socket.bind((self.server_addr[0], self.client_source_port))
except:
pass
# send "SYN" packet to establish 3-way handshake with the server
syn_packet = self.pack_packet("SYN", self.seq_no, self.ack_no)
self.send_window.append(syn_packet)
self.timeout_flag = True
recv_thread = Thread(target=self.receive)
recv_window_handler_thread = Thread(target=self.handle_recv_window)
send_thread = Thread(target=self.send)
timeout_thread = Thread(target=self.timeout_check)
retransmission_thread = Thread(target=self.retransmission_packet)
recv_thread.start()
recv_window_handler_thread.start()
send_thread.start()
timeout_thread.start()
retransmission_thread.start()
self.threads.append(recv_thread)
self.threads.append(recv_window_handler_thread)
self.threads.append(send_thread)
self.threads.append(timeout_thread)
self.threads.append(retransmission_thread)
# receive data from the server
def receive(self):
while True:
try:
data, addr = self.client_socket.recvfrom(self.buffer_size)
if len(self.recv_window) < self.recv_window_size:
self.recv_window.append((data, addr))
self.last_packet_time = time.time()
except:
pass
# handle received data
def handle_recv_window(self):
while True:
while len(self.recv_window) > 0:
data, addr = self.recv_window.pop(0)
packet_type, seq_no, ack_no, dup_ack, payload = self.unpack_packet(data)
packet_type = packet_type.decode().strip("_")
try:
try:
payload_readable = pickle.dumps(payload)
except:
payload_readable = payload.decode()
except:
payload_readable = payload
print(
f"[*] Received packet: ({packet_type}, {seq_no}, {ack_no}, {dup_ack}, {payload_readable}) from server")
if packet_type == "SYN-ACK":
self.seq_no = ack_no
self.ack_no = seq_no + 1
packet = self.pack_packet("ACK", self.seq_no, self.ack_no)
self.send_window.append(packet)
self.last_packet_sent = packet
print(f"[+] Connection to the server established successfully")
if payload is not None:
self.table_list = pickle.loads(payload)
self.conn_flag = True
self.timeout_flag = False
if packet_type == "ACK":
self.timeout_flag = False
self.last_ack_time = time.time()
if packet_type == "FIN-ACK":
self.seq_no = ack_no
self.ack_no = seq_no + 1
packet = self.pack_packet("CLOSE_CONN", self.seq_no, self.ack_no)
self.send_window.append(packet)
print(f"[-] Connection closed")
self.timeout_flag = False
self.table_list = []
self.curr_table = None
for thread in self.threads:
thread.join()
if packet_type == "TABLE_LIST":
self.table_list = pickle.loads(payload)
print(f"[+] Table list updated: {self.table_list}")
packet = self.pack_packet("ACK", self.seq_no, self.ack_no)
self.send_window.append(packet)
self.timeout_flag = False
if packet_type == "TABLE_INFO":
self.curr_table = pickle.loads(payload)
if self.curr_table is not None:
print(f"[+] Got table {self.curr_table[0]} data ")
else:
print(f"[-] Cannot access table")
packet = self.pack_packet("ACK", self.seq_no, self.ack_no)
self.send_window.append(packet)
self.timeout_flag = False
if packet_type == "CREATE_INSTANCE" or packet_type == "DELETE_INSTANCE":
table_name, columns, instances = pickle.loads(payload)
if self.curr_table[0] == table_name:
print(f"[+] Updating current table list instances: {instances}")
self.curr_table[2] = instances
packet = self.pack_packet("ACK", self.seq_no, self.ack_no)
self.send_window.append(packet)
self.timeout_flag = False
if packet_type == "MIN_MAX_SUM_AVG":
self.curr_value = str(payload.decode())
print(f"[+] Got desired choice value: {self.curr_value}")
packet = self.pack_packet("ACK", self.seq_no, self.ack_no)
self.send_window.append(packet)
self.timeout_flag = False
if packet_type == "COUNT_ROWS":
self.curr_value = str(payload.decode())
print(f"[+] Got desired row value: {self.curr_value}")
packet = self.pack_packet("ACK", self.seq_no, self.ack_no)
self.send_window.append(packet)
self.timeout_flag = False
if packet_type == "CONN_TIMEOUT":
print(f"[-] Connection failed, connection timeout has occurred")
self.conn_flag = False
self.timeout_flag = False
for thread in self.threads:
thread.join()
# send data to the server
def send(self):
while True:
try:
while 0 < len(self.send_window):
data = self.send_window.pop(0)
if len(self.send_window) < self.send_window_size:
self.client_socket.sendto(data, self.server_addr)
self.last_packet_sent = data
print(f"[*] Sending packet: {self.unpack_packet(data)}")
_, _, _, dup_ack, _ = self.unpack_packet(data)
if not dup_ack:
self.last_packet_time = time.time()
except:
pass
# disconnect from the server
def disconnect(self):
fin_packet = self.pack_packet("FIN", self.seq_no, self.ack_no)
self.send_window.append(fin_packet)
self.conn_flag = False
self.last_packet_sent = fin_packet
# ----------------------------------------------------------------- #
# RUDP related Section #
# ----------------------------------------------------------------- #
# check for connection timeout error
def timeout_check(self):
while True:
time.sleep(2)
try:
if self.timeout_flag is True:
if time.time() - self.last_packet_time > self.timeout:
print(f"[-] Connection failed, connection timeout has occurred")
try:
conn_timeout_packet = self.pack_packet("CONN_TIMEOUT", self.seq_no, self.ack_no + 1)
self.send_window.append(conn_timeout_packet)
self.conn_flag = False
self.timeout_flag = False
except:
pass
time.sleep(1)
except:
pass
# retransmission last packet sent to the server
def retransmission_packet(self):
while True:
time.sleep(self.retransmission)
try:
if self.timeout_flag is True:
if time.time() - self.last_packet_time > self.retransmission:
packet_type, seq_no, ack_no, dup_ack, payload = self.unpack_packet(self.last_packet_sent)
dup_ack = True
dup_packet = self.pack_packet(packet_type, seq_no, ack_no, dup_ack, payload)
print(f"[+] Retransmission for packet {{type:{packet_type}; seq_no:{seq_no}}}")
try:
self.send_window.append(dup_packet)
except:
pass
except:
pass
# ----------------------------------------------------------------- #
# Server request related Section #
# ----------------------------------------------------------------- #
# request the server to access table data from the database
def access_table(self, table):
access_table_packet = self.pack_packet("ACCESS_TABLE", self.seq_no, self.ack_no + 1,
payload=str(table).encode())
self.send_window.append(access_table_packet)
self.last_packet_sent = access_table_packet
self.timeout_flag = True
# request the server to delete table from the database
def delete_table(self, table):
delete_table_packet = self.pack_packet("DELETE_TABLE", self.seq_no, self.ack_no + 1,
payload=str(table).encode())
self.send_window.append(delete_table_packet)
self.last_packet_sent = delete_table_packet
self.timeout_flag = True
def delete_instance(self, table_name, instance_index):
delete_instance_packet = self.pack_packet("DELETE_INSTANCE", self.seq_no, self.ack_no + 1,
payload=pickle.dumps((table_name, instance_index)))
print((table_name, instance_index))
self.send_window.append(delete_instance_packet)
self.last_packet_sent = delete_instance_packet
self.timeout_flag = True
# request the server to create table and add to the database
def create_table(self, table_info):
table_info = pickle.dumps(table_info)
create_table_packet = self.pack_packet("CREATE_TABLE", self.seq_no, self.ack_no + 1, payload=table_info)
self.send_window.append(create_table_packet)
self.last_packet_sent = create_table_packet
self.timeout_flag = True
# request the server to create instance and add to the database table
def create_instance(self, table_name, instance):
info = pickle.dumps((table_name, instance))
create_instance_packet = self.pack_packet("CREATE_INSTANCE", self.seq_no, self.ack_no + 1, payload=info)
self.send_window.append(create_instance_packet)
self.last_packet_sent = create_instance_packet
self.timeout_flag = True
# request the server to send an answer according to the desired choice
def get_min_max_avg_sum(self, choice_info):
get_min_max_avg_sum_packet = self.pack_packet("MIN_MAX_SUM_AVG", self.seq_no, self.ack_no + 1,
payload=choice_info.encode())
self.send_window.append(get_min_max_avg_sum_packet)
self.last_packet_sent = get_min_max_avg_sum_packet
self.timeout_flag = True
def count_rows(self, info):
count_rows_packet = self.pack_packet("COUNT_ROWS", self.seq_no, self.ack_no + 1,
payload=info.encode())
self.send_window.append(count_rows_packet)
self.last_packet_sent = count_rows_packet
self.timeout_flag = True
# ----------------------------------------------------------------- #
# Packet analysis related Section #
# ----------------------------------------------------------------- #
# pack packet of length of 20 chars, 2 integers and 1 boolean + payload
@staticmethod
def pack_packet(packet_type, seq_no, ack_no, dup_ack=False, payload=None):
if type(packet_type) is not bytes:
packet_type = packet_type.ljust(20, "_")
packet_type = packet_type.encode()
packet = struct.pack('20s 2i ?', packet_type, seq_no, ack_no, dup_ack)
if payload is not None:
packet += payload
return packet
# unpack packet of length of 20 chars, 2 integers and 1 boolean + payload
@staticmethod
def unpack_packet(packet):
header_size = struct.calcsize("20s 2i ?")
header = packet[:header_size]
payload = packet[header_size:]
packet_type, seq_no, ack_no, dup_ack = struct.unpack("20s 2i ?", header)
return packet_type, seq_no, ack_no, dup_ack, payload