#!/usr/bin/env python
# Basic Echo Server - socketserver.py
import socket, traceback, sys

host = ''  # Binds to all, anyone can connect
port = 50000

# Create socket s(    IPv4      ,        TCP        )
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# Setting Socket Options( level , optname , value)
# SO_REUSEADDR: Releases port immediately after server stops
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((host, port))  # Binds the server to a host add a port number
s.listen(5)  # Tells the server to listen for connections
             # 5 is the amount of queues the server will allow
once = 0  # Bool if a connection has already been made

while(5):
    if once:
        print "\n Awaiting more connections...",
        print "If you are tired and wish to stop, press Ctrl-C!"
    else:
        print "\n Awaiting connections...",
        print "If you are tired and wish to stop, press Ctrl-C!"
    try:
        clientsock, clientaddr = s.accept()
    except KeyboardInterrupt:
        # Allows user to cancel with Ctrl-C while opening connection
        raise
    except:
        # Prints out any other error, but does not kill the server
        traceback.print_exc()
        continue

    #Sets time before timeout is triggered
    clientsock.settimeout(100)

    # Process Connection
    try:
        name = clientsock.recv(4096)
        print "\n%s connected from" % name, clientsock.getpeername()
        onceChat = 0 # Sets to beginning chat message
        print " Awaiting message.... "
        while 1:
            if onceChat:
                print " Awaiting response...."
            # Waits until data is recieved, passes into variable data
            data = clientsock.recv(4096)
            if not len(data):
                break
            print "%s says: %s" % (name, data)
            print "Server says?: ",
            data = sys.stdin.readline().strip()
            # Sends message to the client
            clientsock.sendall(data)
            onceChat = 1  # Continuous chat style triggered    
    except (KeyboardInterrupt, SystemExit):
        raise
    except socket.timeout:
        print "Client timed out. ",
        pass
    except:
        traceback.print_exc()
    
    try:
        clientsock.close()
        print "Connection has been closed."
        once = 1 # One connection has been made
    except KeyboardInterrupt:
        raise
    except:
        traceback.print_exc()