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QUIC.py
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QUIC.py
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import random
from socket import socket, AF_INET, SOCK_DGRAM
import math
import struct
import time
import asyncio
from enum import IntEnum
from random import randint
from typing import Dict, List, Tuple
from dataclasses import dataclass
OVERALL_DATA = 0 # The position in the stats dictionary for overall data that was sent/received
class FLAGS(IntEnum):
SYN = 1
SYN_ACK = 2
ACK = 3
DATA_PACKET = 4
END_OF_DATA = 5
FIN = 6
FIRST_PACKET = 7
LAST_PACKET = 8
class QUIC_CONNECTION:
def __init__(self):
# Initialize attributes for the connection state
self.sock = socket(AF_INET, SOCK_DGRAM)
self.is_closed = False
# Variables to store host and port for reuse
self.host_address = None
self.port = None
# Initialize stream-related attributes
self.stream_ID = 0 # each stream has a unique ID
# Dictionaries to store incoming and outgoing streams
# Dictionaries to store stream statistics, and connection statistics for further analysis
self.in_streams: Dict[int, bytes] = {}
self.out_streams: Dict[int, bytes] = {}
self.streams_stats: Dict[int, Stats] = {}
self.connection_stats: Dict[int, Stats] = {}
def listen_incoming_connections(self, host: str, port: int):
"""Listen for incoming connections."""
print(f"Listening for incoming connections on {host}:{port}")
self.host_address = host
self.port = port
# bind the socket to the host and port
self.sock.bind((self.host_address, self.port))
received_data, address = self.sock.recvfrom(QUIC_PACKET.Max_size)
received_packet = QUIC_PACKET.deserialize_data(received_data)[0]
if received_packet.packet_flag == FLAGS.SYN:
print(f"Received SYN packet from client in address: {address}")
received_packet.packet_flag = FLAGS.SYN_ACK
self.sock.sendto(received_packet.serialize_data(), address)
else:
# at this point we only want to receive SYN packets
raise Exception("Unexpected packet received")
def connect_to(self, host: str, port: int):
self.host_address = host
self.port = port
connect_packet = QUIC_PACKET(FLAGS.SYN) # create a SYN type packet
self.sock.sendto(connect_packet.serialize_data(), (self.host_address, self.port))
received_data, address = self.sock.recvfrom(QUIC_PACKET.Max_size)
received_packet = QUIC_PACKET.deserialize_data(received_data)[0]
if received_packet.packet_flag == FLAGS.SYN_ACK:
print("GOT SYN_ACK FROM THE SERVER")
else:
raise Exception("Connection failed")
async def send_data(self, list_of_files: List[bytes]) -> None:
for i, file in enumerate(list_of_files):
self.out_streams[i + 1] = file
await self.send_to_streams()
print("Data sent successfully")
self.out_streams.clear()
final_packet = QUIC_PACKET(FLAGS.END_OF_DATA)
self.sock.sendto(final_packet.serialize_data(), (self.host_address, self.port))
async def send_to_streams(self) -> None:
await asyncio.gather(*(self.send_stream_data(stream_id) for stream_id in self.out_streams))
async def send_stream_data(self, stream_id: int) -> None:
"""
1. get the data from each stream by stream_id
2. generate random frame size and calculate number of frames needed.
3. calculate frames per packet
4. calculate number of packets needed.
5. divide the data to frames and add the frames to the packet.
6. send the frames on the stream.
"""
data_from_stream = self.out_streams[stream_id]
# generate random frame size
frame_size = int(random.uniform(1000, 2000))
# calculate the frame payload size (without the header)
frame_payload_size = frame_size - QUIC_PACKET.FRAME_LENGTH
# calculate the number of frames per packet
frames_per_packet = math.floor(QUIC_PACKET.MAX_DATA_SIZE/ frame_size)
needed_frames_amount = math.ceil(len(data_from_stream) / frame_payload_size)
packet_payload_size = frames_per_packet * frame_payload_size
needed_packets_amount = math.ceil(needed_frames_amount / frames_per_packet)
current_frame = 0
for i in range(needed_packets_amount):
#
if i == 0:
packet = QUIC_PACKET(FLAGS.FIRST_PACKET)
elif i == needed_packets_amount - 1:
packet = QUIC_PACKET(FLAGS.LAST_PACKET)
else:
packet = QUIC_PACKET(FLAGS.DATA_PACKET)
bytes_added_until_now = i * packet_payload_size
for frame_offset in range(frames_per_packet):
start_index = bytes_added_until_now + frame_offset * frame_payload_size
if current_frame == needed_frames_amount - 1:
end_index = start_index + min((packet_payload_size - (frame_offset-1) * frame_payload_size), frame_payload_size)
else:
end_index = start_index + frame_payload_size
awaiting_data = data_from_stream[start_index:end_index]
current_frame += 1
packet.link_frame(stream_id, frame_offset, awaiting_data)
self.sock.sendto(packet.serialize_data(), (self.host_address, self.port))
await asyncio.sleep(0.001)
async def receive_data(self) -> List[bytes] | None:
"""
1. receive data from the socket and divide it into packet and frames
2. if the packet is not SYN/ACK/SYN_ACK/FIN start measuring time
3. if the stream_id is not in the streams stats dictionary,add it
:return:
"""
frames_received_counter = 0
while True:
received_data, address = self.sock.recvfrom(QUIC_PACKET.Max_size)
received_packet, received_frames = QUIC_PACKET.deserialize_data(received_data)
if received_packet.packet_flag not in (FLAGS.SYN ,FLAGS.ACK,
FLAGS.SYN_ACK, FLAGS.FIN):
frames_received_counter += len(received_frames)
# GOT THE FIRST PACKET OF THE SPECIFIC STREAM, START MEASURING TIME
if received_packet.packet_flag == FLAGS.FIRST_PACKET:
if received_frames[0].stream_id not in self.streams_stats:
self.streams_stats[received_frames[0].stream_id] = Stats(received_frames[0].stream_id, 0, 0, 0,
time.time())
if OVERALL_DATA not in self.connection_stats:
self.connection_stats[OVERALL_DATA] = Stats(0, 0, 0, 0, time.time())
if len(received_frames) != 0:
self.streams_stats[received_frames[0].stream_id].frames_amount += len(received_frames)
self.connection_stats[OVERALL_DATA].frames_amount += len(received_frames)
# GOT THE LAST PACKET OF THE SPECIFIC STREAM, MEASURING END TIME
if received_packet.packet_flag == FLAGS.LAST_PACKET:
self.streams_stats[received_frames[0].stream_id].time = time.time() - self.streams_stats[
received_frames[0].stream_id].time
# GOT THE LAST PACKET OF THE PAYLOAD, MEASURING END TIME
if received_packet.packet_flag == FLAGS.END_OF_DATA:
self.connection_stats[OVERALL_DATA].time = time.time() - self.connection_stats[OVERALL_DATA].time
self.print_stats()
break
# UPDATE STATS
self.streams_stats[received_frames[0].stream_id].packets_amount += 1
self.streams_stats[received_frames[0].stream_id].total_bytes_amount += len(received_data)
self.connection_stats[OVERALL_DATA].packets_amount += 1
self.connection_stats[OVERALL_DATA].total_bytes_amount += len(received_data)
# AFTER RECEIVING PACKET, SEND ACK
self.sock.sendto(QUIC_PACKET(FLAGS.ACK).serialize_data(), address)
for frame in received_frames:
if frame.stream_id not in self.in_streams:
self.in_streams[frame.stream_id] = frame.frame_data
else:
self.in_streams[frame.stream_id] += frame.frame_data
if received_packet.packet_flag == FLAGS.FIN:
self.terminate_connection()
return None
received_files = list(self.in_streams.values())
self.in_streams.clear()
return received_files
# def print_stats(self) -> None:
# for stream_id, stats in self.streams_stats.items():
# print(f"Stream ID: {stream_id}")
# print(f"Number of packets: {stats.packets_amount}")
# print(f"Number of frames: {stats.frames_amount}")
# print(f"Total bytes: {stats.total_bytes_amount}")
# print(f"Time: {stats.time}")
# print("\n")
def print_stats(self) -> None:
"""
Display the statistics of the connection as requested in the assignment.
"""
print("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Statistics~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n")
# d part
avg_data_rate = self.connection_stats[0].total_bytes_amount / self.connection_stats[0].time
print(f"\t{'Average data rate':<25}: {avg_data_rate:,} bytes per second")
# e part
avg_packet_rate = self.connection_stats[0].packets_amount / self.connection_stats[0].time
print(f"\t{'Average packet rate':<25}: {avg_packet_rate:,} packets per second")
print("\nEach stream statistics:")
for i in self.streams_stats:
print(f"\tStream {self.streams_stats[i].stream_id:,} statistics:")
print(f"\t\t{'Number of packets':<20}: {self.streams_stats[i].packets_amount:,}")
print(f"\t\t{'Number of frames':<20}: {self.streams_stats[i].frames_amount:,}")
print(f"\t\t{'Number of bytes':<20}: {self.streams_stats[i].total_bytes_amount:,}")
print(f"\t\t{'Time':<20}: {self.streams_stats[i].time:,} seconds")
# c part
avg_data_rate = self.streams_stats[i].total_bytes_amount / self.streams_stats[i].time
print(f"\t\t{'Average data rate':<20}: {avg_data_rate:,} bytes per second")
print("\n~~~~~~~~~~~~~~~~~~~~~~~~~End of statistics~~~~~~~~~~~~~~~~~~~~~~~~~~")
# TODO: show graphs of d and e on different number of streams
# will be used when we get FIN packet.
def terminate_connection(self) -> None:
print(f"Got FIN packet, terminating connection")
self.sock.close()
self.is_closed = True
# send FIN packet to the other side.
def end_communication(self):
if self.is_closed:
return
self.sock.sendto(QUIC_PACKET(FLAGS.FIN).serialize_data(), (self.host_address, self.port))
self.terminate_connection()
class Stats:
def __init__(self, stream_id: int, packets_amount: int, frames_amount: int, bytes_amount: int, _time: float):
self.stream_id = stream_id
self.packets_amount = packets_amount
self.frames_amount = frames_amount
self.total_bytes_amount = bytes_amount
self.time = _time
class QUIC_PACKET:
packet_id_counter = 0
Max_size = 20000
HEADER_LENGTH = struct.calcsize('!BIQ')
FRAME_LENGTH = struct.calcsize('!IIQ')
MAX_DATA_SIZE = Max_size - HEADER_LENGTH
def __init__(self, flag):
QUIC_PACKET.packet_id_counter += 1
self.packet_ID = QUIC_PACKET.packet_id_counter
self.packet_flag = flag
self.packet_data = bytearray() # using bytearray because it is mutable and can be modified
@classmethod
def deserialize_data(cls, data: bytes) -> Tuple['QUIC_PACKET', List['QUIC_FRAME']]:
packet_header = struct.unpack('!BIQ', data[:cls.HEADER_LENGTH])
flag, packet_id, data_size = packet_header
packet = QUIC_PACKET(flag)
packet.packet_ID = packet_id
packet.packet_data = bytearray(data[cls.HEADER_LENGTH: cls.HEADER_LENGTH + data_size])
packet_frames = []
frame_position_offset = 0
while frame_position_offset < len(packet.packet_data):
frame_header = struct.unpack('!IIQ',
packet.packet_data[frame_position_offset:frame_position_offset + cls.FRAME_LENGTH])
stream_id, position_in_stream, frame_size = frame_header
frame_position_offset += cls.FRAME_LENGTH # skip to the next frame by frame length
frame_data = packet.packet_data[frame_position_offset:frame_position_offset + frame_size]
frame_to_add = QUIC_FRAME(stream_id, position_in_stream, frame_data)
packet_frames.append(frame_to_add)
frame_position_offset += frame_size
return packet, packet_frames
def serialize_data(self) -> bytes:
packet_header = struct.pack('!BIQ', self.packet_flag, self.packet_ID, len(self.packet_data))
return packet_header + self.packet_data
def link_frame(self, stream_id: int, position_in_stream: int, data: bytes):
frame_to_link = struct.pack('!IIQ', stream_id, position_in_stream, len(data)) + data
if len(self.packet_data) + len(frame_to_link) > QUIC_PACKET.MAX_DATA_SIZE:
raise Exception("Frame size is too large")
self.packet_data += frame_to_link
class QUIC_FRAME:
def __init__(self, stream_id: int, position_in_stream: int, data: bytes):
self.stream_id = stream_id
self.position_in_stream = position_in_stream
self.frame_data = data
def __len__(self):
return len(self.frame_data)