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#!/usr/bin/env python3
import socket
import threading
import signal
import sys
from functools import partial
from datetime import datetime
HOST = "0.0.0.0"
PORT = 5000
DEBUG = True
running = True
def debug(string):
if (DEBUG):
print("{} DEBUG: {}".format(datetime.now(), string))
def signal_handler(signal, frame):
print("Closing sockets and shutting down...")
global running
running = False
sys.exit(0)
signal.signal(signal.SIGINT, signal_handler)
def parse_message(text):
rows = text.split('\n')
if (len(rows) < 3):
return None
try:
command = rows[0].strip()
username = rows[1].strip()
body = rows[2].strip()
except:
return None
debug("Command '{}' from '{}' with body '{}'".format(command, username, body))
return (command, username, body)
def broadcast(message, username, recipients):
debug("Broadcasting message '{}'".format(message))
for rec in recipients:
response = "BROADCAST\n{}\n{}\n".format(username, message)
try:
rec.send(response.encode())
except OSError:
debug("ERROR: Couldn't broadcast message to {}".format(str(rec)))
def do_command(command, username, body, bc):
if command == "CONNECT":
bc("User {} has connected".format(username), username)
elif command == "DISCONNECT":
bc("User {} has disconnected".format(username), username)
elif command == "MESSAGE":
bc("{}".format(body), username)
elif command == "KEEPALIVE":
pass
else:
debug("Unknown command '{}' from user '{}'".format(command, username))
def keep_connection(conn, addr, connections):
debug("Connection from: {}".format(addr))
broadcast_fun = partial(broadcast, recipients=connections)
while running:
data = conn.recv(1024).decode()
if not data:
break
data_tuple = parse_message(str(data))
if not data_tuple:
debug("Failed to parse data from client")
continue
command, username, body = data_tuple
do_command(command, username, body, broadcast_fun)
conn.close()
connections.remove(conn)
debug("Closed connection to: {}".format(addr))
def main():
sock = socket.socket()
sock.bind((HOST, PORT))
connections = []
threads = []
sock.listen(1)
print("Chat server running on {}:{}".format(HOST, PORT))
print("Press CTRL-C to quit")
while running:
conn, addr = sock.accept()
t = threading.Thread(target=keep_connection, args=(conn, addr, connections))
threads.append(t)
connections.append(conn)
t.daemon = True
t.start()
if __name__ == '__main__':
main()
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