Mailing List Archive

Those of you subscribed to the subversion commitlogs will have noticed
that I am working on the VCL compiler right now.

The two most recent changes is that multiple definitions of the
vcl methods are concatenated so that

sub vcl_pipe {
foo;
}
sub vcl_pipe {
bar;
}

is the same as

sub vcl_pipe {
foo;
bar;
}

Together with the other change, that adds

include "somefile" ;

to the syntax, this should allow us to implement a sort of VCL
library which can easily be shared.

For instance, a vcl file implementing the squid purge functionality
could look like:

sub vcl_recv {
if (req.request == "PURGE") {
lookup;
}
}

sub vcl_hit {
if (req.request == "PURGE") {
set obj.ttl = 0s;
error 200 "Purged.";
}
}

sub vcl_miss {
if (req.request == "PURGE") {
error 404 "Not in cache.";
}
}

Wanting to apply an acl to the PURGE functionality, it could be
called from a VCL program as such:


sub vcl_recv {
if (req.request == "PURGE") {
if (!client.ip ~ acl_purge) {
error 405 "Not allowed.";
}
}
}

include "squid_purge.vcl";


If we come up with a set of such generally useful VCL snippets,
we could decide to add the "library" to the binary so tha tone
could just write:

include "@squid_purge"

and have The Right Thing Happen.

As always: feedback and input most welcome!

Poul-Henning

--
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.