Socket Server Backend

import thread
import socket
import sys


HOST = socket.gethostname()
print HOST

PORT = 2468
welcome_msg = 0


s = socket.socket(socket.AF_INET, socket.SOCK_STREAM )
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
print "Socket Created"

try:
    s.bind((HOST, PORT))
except socket.error, msg:
    print "Bind failed. Error Code : " + str(msg[0]) + " Message " + str(msg[1])
    sys.exit()
print "Socket Bind Complete"
"""
So by specifying 10, it means that if 10
connections are already waiting to be processed,
then the 11th connection request shall be rejected.
This will be more clear after checking socket_accept.
"""
s.listen(10)
print "Socket now listening"


def open_welcome():
    welcome_txt = open("welcome.txt", "r")
    welcome_msg = welcome_txt.read()
    print welcome_msg
    return welcome_msg

def open_msg():
    send_msg = open("send_able.txt", "r")
    data = send_msg.read()
    send_msg.close()
    send_msg = open("send_able.txt", "w+")
    send_msg.write("")
    send_msg.close()

def old_msg(data):
    while True:
        oldmsg = open("old_msg.txt", "a+")
        try:
            oldmsg.write("%s \n" % (data))
        except TypeError:
            print "SERVER MSG >>> NO MESSAGE SENT"
        oldmsg.close()

#Function for handling connections
def clientthread(connection, welcome_msg):

    #Sending message to connected client
    #This only takes strings (words

    connection.send(open_welcome())

    #loop so that function does not terminate and the thread does not end
    while True:

        #Receiving from client
        data = connection.recv(1024)
        if not data:
            break
        if data:
            connection.sendall(data)
            old_msg(data)
        print data

    connection.close()

def main_server():
    while True:

        #Wait to accept a connection - blocking call
        connection, addr = s.accept()
        #display client information (IP address)
        print 'Connected with ' + addr[0] + ':' + str(addr[1])

        #Start new thread takees 1st argument as a function name to be run, second
        #is the tuple of arguments to the function

        thread.start_new_thread(clientthread (connection, welcome_msg))

def main():
    open_welcome()
    open_msg()
    main_server()

main()



















s.close()