[mz392@nyu.edu: Re: [Filescope-devel] Gnutella webcache problem.]

[Matt Z. <mz...@ny...>]

All,

I replied to Shervin but I forgot to send it to the list.
So here it is:

--Matt

----- Forwarded message from Matt Zyzik <mz...@ny...> -----

Date: Sun, 20 Feb 2005 22:24:07 -0500
From: Matt Zyzik <mz...@ny...>
To: Shervin <She...@sh...>
Subject: Re: [Filescope-devel] Gnutella webcache problem.
In-Reply-To: <0IC3004F1LWTI4@l-daemon>
User-Agent: Mutt/1.5.6i

Shervin,

Great patch. Not even necessary on the Gnutella2 side. I guess I just forgot for G1.
As for the webCache issue; again, it's something I forgot on the Gnutella1 side. Take a look, Shervin, if you can, at the way Gnutella2 removes servers (Core/Gnutella2/Sck.cs line 389). Notice how it cannot remove more than one webCache per session. I think the best idea is that we just copy the same behavior. This way the format of the *.fscp files doesn't have to change, and the fix would be much easier.
The subnet scanning idea is maybe interesting; however, no other client does it; and it would be bad for the network because the decentralized model favors interweaving among hosts in a distributed (rather than grouping) manner. Also, many ISPs dislike it when people scan subnets for anything. At this point, such enhancements are really not needed. Trust me when I say that making this program work solidly without bugs or issues is the crucial priority for now (especially Gnutella2).

Anyone's input is appreciated.

--Matt

On Fri, Feb 18, 2005 at 12:21:57AM -0800, Shervin wrote:
> Hi all
> 
> When you first run FileScope, it creates a Web Cache within the wizard
> process (SWF-UI\Dialogs\WizardDlg.cs line 746) and then saves it to the file
> "webcache.fscp".
> 
> After this every time that you load FileScope, this file gets loaded and
> these servers are used to get a list of possible hosts to connect to.
> 
> Now the problem is that, FileScope removes a host from this list if it can
> not connect to it (Core\Gnutella\Sck.cs line 268)and this list is written
> back to the file every time we close FileScope (Core\StartApp.cs line 123).
> In my case when I tried to connect to Gnutella all the servers returned some
> kind of an error! So all of them got removed. Now when I closed and reopened
> FileScope there were no more servers to even try to connect to!
> 
> I don't think we want to remove any of these servers from the list, even if
> they are not responding. What I suggest we should do, is to have some kind
> of a priority system or a grading system for the web caches.
> 
> For example we will have grades from 0 to 20 (0 being best) and they all
> start with 5. Now every time that we fail to connect to them their grade
> goes up by 1 and every time we are successful their grade goes down by 3.
> If they reach 20 they get deleted.
> 
> Now when we are connecting we give the priority to the ones that have the
> lowest grade.
> 
> Also we must have a subnet scanning system to try to find a host within that
> user's subnet. After all you would want to be connected to someone close to
> you anyways. Right now priority is with the cached hosts and then cached web
> servers. I think it should be cached hosts, subnet scan and then web cache.
> 
> Let me know what you guys think.
> 
> Here is a patch for now to avoid FileScope crashing when there are no more
> servers left. I have committed this patch to CVS.
> 
> Shervin
> 
> 
> Index: ConnectionManager.cs
> ===================================================================
> RCS file: /cvsroot/filescope/filescope/Core/Gnutella/ConnectionManager.cs,v
> retrieving revision 1.1.1.1
> diff -r1.1.1.1 ConnectionManager.cs
> 265a266,270
> > 					if(Stats.gnutellaWebCache.Count ==
> 0)
> 
> > 					{
> 
> >
> System.Diagnostics.Debug.WriteLine("no more webcache servers");
> 
> > 						return;
> 
> > 					}
> 
> 
> 
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----- End forwarded message -----