Question

sorry if my english is not good.
I wanna write a program that can open the site every 15 seconds. But do it with a different IP. That means get a list of IP and every 15 seconds open a website. How did you do it? What module should I use? Thanks you

Answer 1

If you’re asking how to make sure you fire off one connection every 15 seconds, even though it may take a few seconds (maybe even longer than 15) for each one, that’s easy. Since you’re only making one connection every 15 seconds, there’s really no reason not to just spawn a thread for each one.

So:

def connectToSiteFunction(ip):
    # your code to bind ip (if it's a source) or connect to it (if it's a dst) 
    # and do your thing here

def connectAndWait():
    for ip in ips:
        t = threading.Thread(target=connectToSiteFunction, args=(ip,))
        yield t
        t.start()
        os.sleep(15)

threads = [t for t in connectAndWait()]
for t in threads:
    t.join()

If you’re talking about destination IPs, and you want to know how to use a different one for each request… well, you usually just modify the URL. Something like this:

def connectToSiteFunction(ip):
    url = 'http://{}/path/to/page.html'.format(ip)
    # now open url as normal

If you’re asking how to bind a source address with your chosen URL-downloading library, you’d have to tell us which library, but: Either the library will have a parameter for it, or it will have a way for you to specify a socket factory, or it will be impossible (unless you want to monkeypatch socket.socket with your own factory). If it lets you specify a socket factory, the way to do it is this:

def make_socket_factory(srcip):
    def socket_factory():
        s = socket.socket()
        s.bind((srcip, 0))
        return s
    return socket_factory

Then just pass in make_socket_factory(srcip) as the factory.

If you want to know how to download a URL in the first place… there are a lot of ways to do that, from the stdlib urllib2 to requests and pycurl to twisted, and there are already plenty of answers on SO (and elsewhere) comparing and contrasting them.