[Twisted-Python] newbie: asynchronous client
bob at redivi.com
Mon Feb 17 19:14:27 EST 2003
On Monday, Feb 17, 2003, at 18:44 America/New_York, Jp Calderone wrote:
> On Mon, Feb 17, 2003 at 05:56:56PM -0500, Joshua Bloom wrote:
>> I'd like to set up a non-blocking TCP client that loops indefinately,
>> waiting for the user to input something (which gets sent to the
>> but also responds to server replies whenever it can. So after I send
>> "factorial 1234" to the server, I'd like to be able to say "1 + 2"
>> the server returns and get a response from that.
>> Thanks in advance for any pointers.
> Non-blocking user-input is the hardest part of this program. That
> if you go with one of the GUI toolkits that Twisted is integrated
> with, it
> should be no problem (Qt, Gtk, Tk, PyUI, curses, wxWindows). Their
> mainloops are mashed into Twisted's in various ways, letting network
> user events happily co-exist. If you go with another toolkit, you'll
> to find some way to accomplish the same mainloop integration.
> Examples for GUI apps are (surprise) in doc/examples/
Eh, if you're fine with line-based input (doesn't actually get data
until user presses enter, and there's a way around that if necessary..
at least you can get around it in unix). I've got some code below that
you could use as a starting point.
I think that maybe there should be a tutorial on how to make
interactive console Twisted programs using stdio and then another with
from twisted.protocols.basic import LineReceiver
from twisted.internet import reactor, stdio
delimiter = '\n'
def lineReceived(self, line):
line = line.rstrip() # this sacrifices trailing white space and/or a
possible '\r' if on windows?
if line.lower() in ('quit', 'q'):
print "You just typed: %s" % (line,)
if __name__ == '__main__':
# basically tie stdin to an instance of MyProtocol
print 'type "q" or "quit" (sans quotes) to exit'
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