Comments for krondo

Comment on Book: Angst: Origins of Anxiety and Depression by Signs Of Depression

Signs Of Depression — Wed, 15 May 2013 10:46:25 +0000

Wow… Thanks for sharing such a wonderful resource. I will comeback with my response after reading it.

Comment on An Introduction to Asynchronous Programming and Twisted by Indradhanush Gupta

Indradhanush Gupta — Wed, 10 Apr 2013 01:07:33 +0000

Thanks for your advice!

Comment on An Introduction to Asynchronous Programming and Twisted by dave

dave — Wed, 10 Apr 2013 01:05:15 +0000

The Twisted developers would have the final say on that, of course, but my guess is that they would not be interested. A port scanner is a very specialized piece of networking code, very few applications would actual need it (aside from a port scanner itself).

Comment on An Introduction to Asynchronous Programming and Twisted by Indradhanush Gupta

Indradhanush Gupta — Wed, 10 Apr 2013 00:56:29 +0000

I mean to say, that will Twisted benefit from a port scanner? Like some other component in twisted could actually use it with purpose.

Comment on An Introduction to Asynchronous Programming and Twisted by Indradhanush Gupta

Indradhanush Gupta — Tue, 09 Apr 2013 14:18:38 +0000

Hi, I was wondering whether creating an advanced asynchronous port scanner using twisted could be a viable GSoC 13 project? Like including some of the advanced Nmap features? Whats your take on this?

Comment on An Introduction to Asynchronous Programming and Twisted by Indradhanush Gupta

Indradhanush Gupta — Sat, 06 Apr 2013 10:37:56 +0000

Thanks! I got it.

Comment on An Introduction to Asynchronous Programming and Twisted by dave

dave — Sat, 06 Apr 2013 06:11:29 +0000

Hey Indradhanush, that is a common pattern in Twisted. A Deferred can only be fired once,
so code that fires a deferred will often drop the reference to the Deferred (allowing it
to be garbage collected quicker as well) and replace it with None. The if
statement is checking to see if the Deferred has already been fired. Now in the particular
case of this example, it should never happen that both poem_finished and
clientConnectionFailed are called and there is more than one school of thought
on whether that sort of “defensive programming” is a good idea. But it is a common pattern
in the Twisted source code.

Comment on An Introduction to Asynchronous Programming and Twisted by Indradhanush Gupta

Indradhanush Gupta — Sat, 06 Apr 2013 05:28:01 +0000

Hi, Dave,

Why are doing ” if self.deferred is not None : ” in both poem_finished() and clientConnectionFailed() methods ?

Comment on An Introduction to Asynchronous Programming and Twisted by Indradhanush Gupta

Indradhanush Gupta — Mon, 01 Apr 2013 06:49:12 +0000

Yeah I thought so too that I’d be needing to go through some more twisted material. But I guess I’ll start building it up and keep adding functionalities as I progress through this tutorial. Thanks a lot for your help!

Comment on An Introduction to Asynchronous Programming and Twisted by dave

dave — Sun, 31 Mar 2013 22:26:21 +0000

I would go through a few more tutorials first, but you already have most of what you need — the clientConnectionFailed is going to be the key to this problem, since it will tell you when you cannot make a connection. Instead of connecting to different servers, you’ll make lots of connections to the same server but different port numbers, and keep track of which ports accept a connection and which ones do not.