Python Socket Multiple Clients

Question

So I am working on an iPhone app that requires a socket to handle multiple clients for online gaming  I have tried Twisted  and with much effort  I have failed to get a bunch of info to be sent at once  which is why I am now going to attempt socket   My question is  using the code below  how would you be able to have multiple clients connected  I ve tried lists  but I just can t figure out the format for that  How can this be accomplished where multiple clients are connected at once and I am able to send a message to a specific client   Thank you      usr bin python             This is server py file  import socket                 Import socket module s   socket socket             Create a socket object host   socket gethostname     Get local machine name port   50000                  Reserve a port for your service   print  Server started   print  Waiting for clients      s bind  host  port            Bind to the port s listen 5                    Now wait for client connection  c  addr   s accept         Establish connection with client  print  Got connection from   addr while True     msg   c recv 1024     print addr     gt  gt     msg    msg   raw input  SERVER  gt  gt        c send msg       c close                    Close the connection

User · Answer

Here is the example from the SocketServer documentation which would make an excellent starting point

import SocketServer

class MyTCPHandler(SocketServer.BaseRequestHandler):
    """
    The RequestHandler class for our server.

    It is instantiated once per connection to the server, and must
    override the handle() method to implement communication to the
    client.
    """

    def handle(self):
        # self.request is the TCP socket connected to the client
        self.data = self.request.recv(1024).strip()
        print "{} wrote:".format(self.client_address[0])
        print self.data
        # just send back the same data, but upper-cased
        self.request.sendall(self.data.upper())

if __name__ == "__main__":
    HOST, PORT = "localhost", 9999

    # Create the server, binding to localhost on port 9999
    server = SocketServer.TCPServer((HOST, PORT), MyTCPHandler)

    # Activate the server; this will keep running until you
    # interrupt the program with Ctrl-C
    server.serve_forever()

Try it from a terminal like this

$ telnet localhost 9999
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Hello
HELLOConnection closed by foreign host.
$ telnet localhost 9999
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Sausage
SAUSAGEConnection closed by foreign host.

You'll probably need to use A Forking or Threading Mixin too

User · Answer

Based on your question      My question is  using the code below  how would you be able to have multiple clients connected  I ve tried lists  but I just can t figure out the format for that  How can this be accomplished where multiple clients are connected at once and I am able to send a message to a specific client    Using the code you gave  you can do this       usr bin python             This is server py file                                                                                                                                                                             import socket                 Import socket module import thread  def on new client clientsocket addr       while True          msg   clientsocket recv 1024           do some checks and if msg    someWeirdSignal  break          print addr     gt  gt     msg         msg   raw input  SERVER  gt  gt              Maybe some code to compute the last digit of PI  play game or anything else can go here and when you are done          clientsocket send msg      clientsocket close    s   socket socket             Create a socket object host   socket gethostname     Get local machine name port   50000                  Reserve a port for your service   print  Server started   print  Waiting for clients      s bind  host  port            Bind to the port s listen 5                    Now wait for client connection   print  Got connection from   addr while True     c  addr   s accept         Establish connection with client     thread start new thread on new client  c addr       Note it s  addr   not  addr  because second parameter is a tuple     Edit   c addr      that s how you pass arguments to functions when creating new threads using thread module  s close     As Eli Bendersky mentioned  you can use processes instead of threads  you can also check python threading module or other async sockets framework  Note  checks are left for you to implement how you want and this is just a basic framework

User · Answer

accept can continuously provide new client connections  However  note that it  and other socket calls are usually blocking  Therefore you have a few options at this point    Open new threads to handle clients  while the main thread goes back to accepting new clients As above but with processes  instead of threads Use asynchronous socket frameworks like Twisted  or a plethora of others

User · Answer

usr bin python import sys import os import socket s   socket socket socket AF INET  socket SOCK STREAM           port   50000  try      s bind  socket gethostname     port   except socket error as msg      print str msg   s listen 10  conn  addr   s accept     print  Got connection from  addr 0      str addr 1    while 1          msg   s recv 1024          print  addr 0       gt  gt     msg         msg   raw input  SERVER  gt  gt    host         s send msg  s close

User · Answer

This program will open 26 sockets where you would be able to connect a lot of TCP clients to it     usr bin python from thread import   import socket import sys  def clientthread conn       buffer        while True          data   conn recv 8192          buffer  data         print buffer      conn sendall reply      conn close    def main        try          host    192 168 1 3          port   6666         tot socket   26         list sock              for i in range tot socket               s   socket socket socket AF INET  socket SOCK STREAM              s setsockopt socket SOL SOCKET socket SO REUSEADDR 1              s bind  host  port i               s listen 10              list sock append s              print      Server listening on  s  d    host   port i            while 1              for j in range len list sock                    conn  addr   list sock j  accept                   print      Connected with     addr 0          str addr 1                   start new thread clientthread   conn            s close        except KeyboardInterrupt as msg          sys exit 0    if   name         main         main

User · Answer

def get clients        first run   True     startMainMenu   False      while True          if first run              global done             done   False             Thread target animate  args   quot Waiting For Connection quot     start            Client  address   objSocket accept           global menuIsOn         if menuIsOn              menuIsOn   False    will stop main menu             startMainMenu   True          done   True            Get Current Directory in Client Machine         current client directory   Client recv 1024  decode  quot utf-8 quot   errors  quot ignore quot              beep on connection         beep           print f quot  bcolors OKBLUE  n      Incoming Connection       bcolors OKGREEN  quot           print    Connected to      address 0          str address 1            try              get client info Client  first run          except Exception as e              print  quot Error data received is not a json  quot               print e          now   datetime now           current time   now strftime  quot  D  H  M  S quot           print  quot   Current Time   quot   current time           print  quot   Current Folder in Client   quot    current client directory   bcolors WARNING           connections append Client           addresses append address           if first run              Thread target threaded main menu  daemon True  start                first run   False         else              print f quot  bcolors OKBLUE   Hit Enter To Continue  bcolors WARNING  n  gt  quot   end  quot  quot           if startMainMenu    True              Thread target threaded main menu  daemon True  start               startMainMenu   False

[python] Python Socket Multiple Clients

Examples related to python

Examples related to sockets