Loop socket request every 5 seconds (Python)

Question

How would i loop every 5 seconds the following code :

sendSocket = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
sendSocket.connect ( ( 'CENSORED', 1234 ) )
sendSocket.send ( 'request posit' )
data = sendSocket.recv( 100 )
chatLog.insert(END, data)

I want a client to recieve data every 5 seconds from a server, i did a while True loop (lol) and the program interface didnt even load and the server got flooded by the client.

I just want the server to update the client every 5 seconds with a variable that is stored on the server, without a user having to manually press a button.

import socket, time
from Tkinter import *

## Main Window
gui = Tk()
gui.geometry('450x350-5+40')
gui.minsize(450,350)
gui.maxsize(450,350)
userInput = StringVar()

## Main window that displays user and server input.
chatLog = Text(gui, width=60, height=15)
chatLog.pack()

## Send Packet function, main part of the script. Sends whatever the user puts in.
def sendChat():
    sendSocket = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
    sendSocket.connect ( ( 'nope.com', 1234 ) )
    sendSocket.send ( e.get() )
    data = sendSocket.recv( 100 )
    chatLog.insert(END, data)
    sendSocket.close()

while True:
    sendSocket = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
    sendSocket.connect ( ( 'nope.com', 1234 ) )
    sendSocket.send ( 'request posit' )
    data = sendSocket.recv( 100 )
    chatLog.insert(END, data)
    sendSocket.close()
    time.sleep (5.0)

## Submit text button
b = Button(gui, text="Send", command=sendChat )
b.pack()

## Text entry box
e = Entry(gui, textvariable=userInput)
e.pack()

gui.mainloop()

Why did you feel the need to randomly insert (lol) into the middle of that? — Winston Ewert
– Winston Ewert, Commented May 30, 2011 at 1:46
The answer to this question depends on how you are creating your program interface. What did you use wxPython, PyQt, PySide, curses, Gtk? — Winston Ewert
– Winston Ewert, Commented May 30, 2011 at 1:47
Because i know while True is definately not the correct way to go about doing something properly. Also i used tkinter to make the GUI. — Brandon Ingham
– Brandon Ingham, Commented May 30, 2011 at 1:49
(lol) in my opinion makes you look silly. I at least takes questions more seriously if you don't do that. — Winston Ewert
– Winston Ewert, Commented May 30, 2011 at 2:04

Community · Accepted Answer · 2017-05-23 12:23:17Z

2

See this question:

How to make tkinter repond events while waiting socket data?

You can also use after_idle

def read_the_socket():
    sendSocket.send ( 'request posit' )
    data = sendSocket.recv( 100 )
    gui.after(5000, read_the_socket)


gui.after_idle(read_the_socket)

after_idle schedules a function the be called once the GUI isn't busy anymore. You can also use .after(time, function) to delay for a specific amount of time before calling the function again.

Finally, you should really maintain your connection to the server not reconnect each time.

edited May 23, 2017 at 12:23

CommunityBot

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answered May 30, 2011 at 2:04

Winston Ewert

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3 Comments

Jochen Ritzel Over a year ago

after(delay_ms, callback, args...) is probably better here, since after_idle will get called alot.

Brandon Ingham Over a year ago

This is good and kind of works but after 1 time i get [Errno 10054] An existing connection was forcibly closed by the remote host

Winston Ewert Over a year ago

@Brandon, is the server yours? The server has to be programmed to allow multiple requests for a single connection. Otherwise you need to include the whole connect/send/recv/close in the function.

score 1 · Accepted Answer · 2011-05-30 02:04:41Z

1

import time

while True:
    do_stuff ()
    time.sleep (5.0)

Ideally after do_stuff up you would calculate how long you had been asleep for, then adjust your sleep time as appropriate to get back into sync.

Edit: This assumes that's all you're doing. Otherwise use the time functions to see if it's been 5 secs. time.localtime() or something. I don't remember their names, but python's libs are well documented.

Edit 2: Although that might not apply to tkinter. Really i wouldnt have posted if the full code and tkinter had been in the original message. Sorry!

edited May 30, 2011 at 2:04

answered May 30, 2011 at 1:42

user774340

4 Comments

Brandon Ingham Over a year ago

Ive done this, the server doesnt get flooded now but the GUI still doesn't load. Its made in tkinter. Ive edited the main post to show the entire code.

user774340 Over a year ago

I don't know tkinter, sorry, can't help you with that. I can't see a problem with while True at all.

user774340 Over a year ago

EDIT: although that might not apply to tkinter. Really i wouldnt have posted if the full code and tkinter had been in the original message. Sorry!

Brandon Ingham Over a year ago

Ah thats my fault, sorry about that. I just assumed what i made it with didnt really matter and there would be a simple solution.

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