100 lines
2.9 KiB
Python
100 lines
2.9 KiB
Python
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import datetime
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import random
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import socket
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import string
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import threading
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import time
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BUFFER_SIZE = 2048
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ENCODING = 'ascii'
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threads = {}
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to_join = []
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def string_generator(size=6, chars=string.ascii_uppercase + string.digits):
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return ''.join(random.choice(chars) for _ in range(size))
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class HandleClientConnectionThread(threading.Thread):
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""" Handle requests given by the client """
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def __init__(self, connection, client_address, id, msg_size):
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threading.Thread.__init__(self)
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self.connection = connection
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self.client_address = client_address
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self.id = id
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self.msg_size = msg_size
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self.delays = []
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def run(self):
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try:
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print(self.id, ": Connection from", self.client_address)
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start_time = None
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buffer_data = ""
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# Receive the data and retransmit it
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while True:
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data = self.connection.recv(BUFFER_SIZE).decode(ENCODING)
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if len(data) == 0:
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# Connection closed at remote; close the connection
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break
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buffer_data += data
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if len(buffer_data) == self.msg_size:
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stop_time = datetime.datetime.now()
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if start_time:
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self.delays.append(stop_time - start_time)
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time.sleep(5.0)
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response = string_generator(size=self.msg_size, chars=string.digits)
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start_time = datetime.datetime.now()
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self.connection.sendall(response).encode(ENCODING)
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buffer_data = ""
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elif len(buffer_data) > self.msg_size:
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print("Too much data; break")
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break
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finally:
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# Clean up the connection
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print(self.id, ": Closing connection")
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self.connection.close()
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print(self.delays)
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to_join.append(self.id)
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def join_finished_threads():
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""" Join threads whose connection is closed """
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while len(to_join) > 0:
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thread_to_join_id = to_join.pop()
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threads[thread_to_join_id].join()
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del threads[thread_to_join_id]
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# Create a TCP/IP socket
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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# Handle reusing the same 5-tuple if the previous one is still in TIME_WAIT
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
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# Bind the socket to the port
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server_address = ('0.0.0.0', 8000)
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print("Stating the server on %s port %s" % server_address)
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sock.bind(server_address)
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# Listen for incoming connections
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sock.listen(4)
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# Connection identifier
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conn_id = 0
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while True:
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# Wait for a connection
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connection, client_address = sock.accept()
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thread = HandleClientConnectionThread(connection, client_address, conn_id, 1200)
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threads[conn_id] = thread
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conn_id += 1
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thread.start()
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join_finished_threads()
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