[Puppet Users] parsing puppet YAML

[Baker, Luke Jefferson]

Hey there,

 

I’ve playing with parsing some of the yaml data that puppet creates. Has anyone had luck doing this with python or the like? It seems that in every yaml file, there is a comment at the top of the file like this..

 

--- !ruby/object:Puppet::Node

 

Which doesn’t make may yaml parsers happy.. where am I going wrong?

 

--Luke Baker

 

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[Ohad Levy]

Hi Luke,

Thats a dump of a ruby object in yaml, meaning that if you would like to restore the object (and its methods) you would need to run it in ruby and load the puppet libraries.

what are you trying to achieve? there are a few examples out there already.

Ohad

[Nigel Kersten]

You can load it in Python, you just need to do a bit more extra work first.

I can get you an example on Monday or whenever Comcast fix my home internet connection...

--
nigel

[Nigel Kersten]

On Fri, May 21, 2010 at 9:44 PM, Baker, Luke Jefferson <Bak...@missouri.edu> wrote:

Hey there,

 

I’ve playing with parsing some of the yaml data that puppet creates. Has anyone had luck doing this with python or the like? It seems that in every yaml file, there is a comment at the top of the file like this..

 

--- !ruby/object:Puppet::Node

 

Which doesn’t make may yaml parsers happy.. where am I going wrong?

Hopefully this is enough to get you started. I've been meaning to write up a blog post on this, so I might try and get that done soon.

You need to set up some stub objects so Python knows what to do with them, like:

class PuppetReport(yaml.YAMLObject):

  yaml_tag = u'!ruby/object:Puppet::Transaction::Report'

  def __init__(self, host, logs, metrics, records, time):

    self.host = host

    self.logs = logs

    self.metrics = metrics

    self.records = records

    self.time = time

class PuppetLog(yaml.YAMLObject):

  yaml_tag = u'!ruby/object:Puppet::Util::Log'

  def __init__(self, source, message, tags, time, level):

    self.source = source

    self.message = message

    self.tags = tags

    self.time = time

    self.level = level

class PuppetMetric(yaml.YAMLObject):

  yaml_tag = u'!ruby/object:Puppet::Util::Metric'

  def __init__(self, values, name, label):

    self.values = values

    self.name = name

    self.label = label

Then when you read the yaml file, Python will consider !ruby/object:Puppet::Util::Metric to be a PuppetMetric class.

This may not be complete even for these objects, but I tend to just iterate until I've got all the data I need.

 

[Stuart Cracraft]

Where did this go?

[Dan White]

Continue down the thread:

http://www.mail-archive.com/puppet...@googlegroups.com/msg11545.html

and then this should help

http://www.skorks.com/2010/04/serializing-and-deserializing-objects-with-ruby/

Puppet::Node is a data structure like Puppet::Transaction::Report and Puppet::Util::Log as described here:

http://docs.puppetlabs.com/puppet/3/reference/format_report.html

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