Puppet provider - xml parsing - help needed

[Martin Alfke]

Hi,

I am stuck at a puppet provider where I need to read data from xml.

Data which needs to get parsed:

<AR>
<AR_ID><![CDATA[8]]></AR_ID>
<IP><![CDATA[172.16.100.208]]></IP>
<MAC><![CDATA[02:00:ac:10:64:d0]]></MAC>
<SIZE><![CDATA[1]]></SIZE>
<TYPE><![CDATA[IP4]]></TYPE>
<USED_LEASES>0</USED_LEASES>
<LEASES/>
</AR>
<AR>
<AR_ID><![CDATA[9]]></AR_ID>
<IP><![CDATA[172.16.100.209]]></IP>
<MAC><![CDATA[02:00:ac:10:64:d1]]></MAC>
<SIZE><![CDATA[1]]></SIZE>
<TYPE><![CDATA[IP4]]></TYPE>
<USED_LEASES>0</USED_LEASES>
<LEASES/>
</AR>


Expected result:

:addressrange =>
{ ‘1' =>
{ ‘ip' => ‘172.16.100.208’, ‘mac' => ’02:00:ac:10:64:d0’ },
‘2' =>
{ ‘ip' => ‘172.16.100.209’, ‘mac' => ’02:00:ac:10:64:d1’ }
}


Actual code (Note: I was never good at coding an will never be):

vnets.collect do |vnet|
new(
:addressrange => Hash[vnet.xpath('./AR_POOL/AR/AR_ID').collect { |ar| [ar.text, ar.xpath('..').collect { |singlear| singlear.xpath('./*').collect { |arvalue| {arvalue.name, arvalue.text} } } ] } ]
)
end


But this code return:
:addressrange=>
{"9"=>
[[{"AR_ID"=>"9"},
{"IP"=>"172.16.100.209"},
{"MAC"=>"02:00:ac:10:64:d1"},
{"SIZE"=>"1"},
{"TYPE"=>"IP4"}]],
"8"=>
[[{"AR_ID"=>"8"},
{"IP"=>"172.16.100.208"},
{"MAC"=>"02:00:ac:10:64:d0"},
{"SIZE"=>"1"},
{"TYPE"=>"IP4"}]],

What would be proper code to build the hash as expected?

Thanks,

Martin

[Henrik Lindberg]

> What would be proper code to build the hash as expected?
>

That is not easy. Is the structure static and only varying where the
actual data is? If so, you could hard code a solution. If you expect
there to be variability in the tags/layout you should consider using an
XML parser and get the data from it.

To do this with regular expressions you need to match the part:

<IP><![CDATA[172.16.100.209]]></IP>
<MAC><![CDATA[02:00:ac:10:64:d1]]></MAC>

with something like this (untested):

/<IP><!\[CDATA|[(.*)\]]></IP>.*<MAC><!\[CDATA\[(.*)\]]></MAC>/

Then apply that to iterate over matches - you need to do matching that
accepts newlines as a match for . etc.

Play with it in Rubular (online ruby regexp tester) until you get it right.

- henrik
--

Visit my Blog "Puppet on the Edge"
http://puppet-on-the-edge.blogspot.se/

[Thomas Hallgren]

I would take a look at nokogiri. It's an XML/HTML parser for Ruby. Some
helpful hints here:
http://stackoverflow.com/questions/11198239/parsing-xml-with-ruby

- thomas

[Martin Alfke]

Many thanks for the feedback.
Structure and Data can vary (depending on functionality - in this case ipv4 vs. ipv6).

I was only doing one thing wrong in my code (one level of indirection too much)
The following solution works:

:addressrange => Hash[vnet.xpath('./AR_POOL/AR/AR_ID').collect { |ar| [ar.text, Hash[ar.xpath('../*').collect { |singlear| [singlear.name.downcase, singlear.text.downcase] } ] ] } ]

I know receive all data as nested hash in the address range attribute.

Best,

Martin

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[Raphaël Pinson]

Hi Martin,

Have you considered using an Augeas provider here, using the Xml lens?

Cheers,

Raphaël

[Martin Alfke]

Hi Raphael,

can the Augeas provider “translate” from xml into Puppet DSL and vice versa?
That would be nice.

Best,
Martin

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[Raphaël Pinson]

Hi Martin,

What do you mean by "translating to Puppet DSL"? Do you have an example of what you want to achieve?

Raphaël