[PATCH] fileread for the std VMOD

[Sanjoy Das]

Hi All!

I've been toying around with Varnish's source for some time and have
been looking for small tasks to get me started with the same. With
PHK's suggestion, I've implemented a small addition to the std VMOD
which reads (and caches) a file. I've attached the patch
(fileread-std-vmod.diff) for review. Once applied, it should allow VCL
to do things like

set resp.http.Some-Header = std.fileread("/tmp/foo");

It loads and caches the contents of "/tmp/foo" in memory and returns
the same; refreshing it whenever the file changes on disk.

While working on the above I ran into a small problem with the import
statement - VCC does not seem to like `import std':

'''
Message from VCC-compiler:
Could not load module std
        XXX: XXX: no default path
        XXX: XXX: no default path: cannot open shared object file: No
such file or directory
('input' Line 1 Pos 8)
import std;
-------###-

Running VCC-compiler failed, exit 1
'''

I fixed this by having VCC (I know that I may be way off on this one):

  i. Load libvmod_std.so automagically for `import std;'
 ii. Requiring something like `import foo
"mysuperdupersharedobject.so";' for other VMODs.
iii. Allow the same convention (ii) for std as well.

This is done by the other patch I've attached (vmod-load-so.diff).
Once applied, it makes VCC accept any of the following:

import std; /* dlopen libvmod_std.so as std automatically */
import std "some_other_std.so"; /* dlopen some_other_std.so as std */
import foo "foo.so"; /* dlopen foo.so and use it as VMOD foo */

Both patches are diffs against SVN revision 5531.

-- 
Regards,

Sanjoy Das.

http://playingwithpointers.com

Public Key at http://playingwithpointers.com/custom/public_key.txt
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