From des at linpro.no  Tue Jun 13 08:30:05 2006
From: des at linpro.no (Dag-Erling =?iso-8859-1?Q?Sm=F8rgrav?=)
Date: Tue, 13 Jun 2006 10:30:05 +0200
Subject: Trac spam
Message-ID: <ujrfyi9bgqa.fsf@cat.linpro.no>

It was bound to happen sooner or later: spammers have figured out how
to spam Trac tickets.  It's not an issue for us yet, because we don't
have any tickets in our database, but once we do we'll have to figure
out a way to block spam followups.

DES
-- 
Dag-Erling Sm?rgrav
Senior Software Developer
Linpro AS - www.linpro.no


From phk at phk.freebsd.dk  Sat Jun 17 21:36:27 2006
From: phk at phk.freebsd.dk (Poul-Henning Kamp)
Date: Sat, 17 Jun 2006 21:36:27 +0000
Subject: Slight change to flow
Message-ID: <92747.1150580187@critter.freebsd.dk>


I have thought about and refined the flow diagram.

The main change is that instead of one "vcl_lookup" function there
are now a "vcl_hit" and a "vcl_miss" function depending
on the outcome of the lookup.

The reasons for this change is to avoid having to handle some really
silly corner cases like having a hit and then ordering a fetch
instead of a pass etc.

Since we have the "lookup" recursion possibility, anything that
could be done before can be done afterwards too, but without the
risk of an object pileup on any given URL.

Minor changes to the graphs include bold lines for the normal flow,
annotation of which variables can be accessed in the VCL code.

On the "complete implementation graph" I have added the "recursive"
path where VCL code sends us back to lookup (dotted lines) and put
the "busy object" path in a subgraph/box of its own.


Dot(1) isn't very good for making this look simple, manual
placement will make it much more readable.

As always: comments and suggestions are most welcome.

Poul-Henning

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end

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


From des at linpro.no  Mon Jun 19 10:31:22 2006
From: des at linpro.no (Dag-Erling =?iso-8859-1?Q?Sm=F8rgrav?=)
Date: Mon, 19 Jun 2006 12:31:22 +0200
Subject: Slight change to flow
References: <92747.1150580187@critter.freebsd.dk>
Message-ID: <ujrac89e8sl.fsf@cat.linpro.no>

"Poul-Henning Kamp" <phk at phk.freebsd.dk> writes:
> The main change is that instead of one "vcl_lookup" function there
> are now a "vcl_hit" and a "vcl_miss" function depending
> on the outcome of the lookup.

Makes perfect sense to me.  The idea is still to avoid having VCL code
block on anything, right?

DES
-- 
Dag-Erling Sm?rgrav
Senior Software Developer
Linpro AS - www.linpro.no


From phk at phk.freebsd.dk  Mon Jun 19 12:53:51 2006
From: phk at phk.freebsd.dk (Poul-Henning Kamp)
Date: Mon, 19 Jun 2006 12:53:51 +0000
Subject: Slight change to flow 
In-Reply-To: Your message of "Mon, 19 Jun 2006 12:31:22 +0200."
	<ujrac89e8sl.fsf@cat.linpro.no> 
Message-ID: <1465.1150721631@critter.freebsd.dk>

In message <ujrac89e8sl.fsf at cat.linpro.no>, Dag-Erling =?iso-8859-1?Q?Sm=F8rgra
v?= writes:
>"Poul-Henning Kamp" <phk at phk.freebsd.dk> writes:
>> The main change is that instead of one "vcl_lookup" function there
>> are now a "vcl_hit" and a "vcl_miss" function depending
>> on the outcome of the lookup.
>
>Makes perfect sense to me.  The idea is still to avoid having VCL code
>block on anything, right?

Yes.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.