12 Dec
2012
12 Dec
'12
12:08 p.m.
12 dec 2012 kl. 10:44 skrev Daniel-Constantin Mierla <miconda(a)gmail.com>om>:
Hello,
On 10/9/12 3:59 PM, Andreas Granig wrote:
A question I came up with yesterday evening:
I have an AVP with five values (0-4) called "jultomte".
Is there a way to assign the FULL avp - all five values - to an xavp value?
Like:
xavp(xmas=>tree) = $avp(jultomte)[*];
/O
Hi,
I'm playing around with xavp, but there are some things I can't wrap my
head around.
What basically works is this:
$xavp(a=>foo) = 'foo';
$xavp(a[0]=>bar) = 'bar';
Getting the value like this:
xlog("L_INFO", "a-foo='$xavp(a=>foo)' and
a-bar='$xavp(a=>bar)'");
as well as
xlog("L_INFO", "a-foo='$xavp(a[0]=>foo)' and
a-bar='$xavp(a[0]=>bar)'");
... works, because when omitting the index, it assumes [0]. I really
like to avoid such implicit assumptions though, to make the config
really clear, so I prefer the second approach.
What doesn't work for me then is explicit assignment of the very first
value, like this:
$xavp(a[0]=>foo) = 'foo';
$xavp(a[0]=>bar) = 'bar';
If I do this, the "a" xavp is never created. Wouldn't it be good
practice to create the xavp on first assignment? That way, I don't have
to take care in the config file whether the xavp is used for the first
time, where I have to omit the index.
xavps are reusing the avps architecture in regards of working as a stack. So last added
is first in the list.
The problem of creating the structure when providing the index is also related to it.
What should happen if one does:
$xavp(a[5]=>foo) = 'foo';
Create other 5 xavps named 'a' (indexes 0 to 4)?
It seemed the right approach not to create new structures at invalid position, by simply
not providing the position. For overwriting a value, the index has to be provided.
The xavps system was under rfc at some point:
http://lists.sip-router.org/pipermail/users/2009-July/024180.html
Of course, it can be adjusted when something can be better, for the moment I don't
see a solution to this case, unless a new operator is introduced.
What I'm also wondering is whether it's possible to directly access
nested xavps, like this:
$xavp(a=>foo) = 'afoo';
$xavp(b=>foo) = 'bfoo';
$xavp(c=>a) = $xavp(a);
$xavp(c=>b) = $xavp(b);
xlog("L_INFO", "a-foo='$xavp(c=>a[0]=>foo)'");
or
xlog("L_INFO", "a-foo='$xavp(c=>a=>foo)'");
Both ways give me "a-foo='<<xavp:0x7f0d387fe178>>'". Is
this even
intended? Would be really cool if that's possible!
Internally it is possible
to have as many nested xavps (the value for an xavp can be a list of xavps). At this
moment, the config file syntax has support only for two levels, your example is returning
the value of c=>a, which is a pointer to another xavp list.