Module: Puppet::Resource::CapabilityFinder Private

Defined in:
lib/puppet/resource/capability_finder.rb

This module is part of a private API. You should avoid using this module if possible, as it may be removed or be changed in the future.

Class Method Summary collapse

Class Method Details

.find(environment, code_id, cap) ⇒ Puppet::Resource?

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Looks up a capability resource from PuppetDB. Capability resources are required to be unique per environment and code id. If multiple copies of a capability resource are found, the one matching the current code id is used.

Parameters:

  • environment (String) —

    environment name

  • code_id (String, nil) —

    code_id of the catalog

  • cap (Puppet::Type) —

    the capability resource type instance

Returns:

  • (Puppet::Resource, nil) —

    The found capability resource or ‘nil` if it could not be found



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# File 'lib/puppet/resource/capability_finder.rb', line 24

def self.find(environment, code_id, cap)
  unless Puppet::Util.const_defined?('Puppetdb')
    raise Puppet::DevError, 'PuppetDB is not available'
  end

  resources = search(nil, nil, cap)

  if resources.size > 1
    Puppet.debug "Found multiple resources when looking up capability #{cap}, filtering by environment #{environment}"
    resources = resources.select { |r| r['tags'].any? { |t| t == "producer:#{environment}" } }
  end

  if resources.size > 1 && code_id
    Puppet.debug "Found multiple resources when looking up capability #{cap}, filtering by code id #{code_id}"
    resources = search(environment, code_id, cap)
  end

  if resources.size > 1
    raise Puppet::DevError,
      "Unexpected response from PuppetDB when looking up #{cap}:\n" \
      "expected exactly one resource but got #{resources.size};\n" \
      "returned data is:\n#{resources.inspect}"
  end

  if resource_hash = resources.first
    resource_hash['type'] = cap.resource_type
    instantiate_resource(resource_hash)
  else
    Puppet.debug "Could not find capability resource #{cap} in PuppetDB"
    nil
  end
end

.query_puppetdb(query) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/puppet/resource/capability_finder.rb', line 82

def self.query_puppetdb(query)
  begin
    # If using PuppetDB >= 4, use the API method query_puppetdb()
    result = if Puppet::Util::Puppetdb.respond_to?(:query_puppetdb)
      # PuppetDB 4 uses a unified query endpoint, so we have to specify what we're querying
      Puppet::Util::Puppetdb.query_puppetdb(["from", "resources", query])
    # For PuppetDB < 4, use the old internal method action()
    else
      url = "/pdb/query/v4/resource?query=#{CGI.escape(query.to_json)}"
      response = Puppet::Util::Puppetdb::Http.action(url) do |conn, uri|
        conn.get(uri, { 'Accept' => 'application/json'})
      end
      JSON.parse(response.body)
    end

    # The format of the response body is documented at
    #   http://docs.puppetlabs.com/puppetdb/3.0/api/query/v4/resources.html#response-format
    unless result.is_a?(Array)
      raise Puppet::DevError,
      "Unexpected response from PuppetDB when looking up #{cap}: " \
        "expected an Array but got #{result.inspect}"
    end

    result
  rescue JSON::JSONError => e
    raise Puppet::DevError,
      "Invalid JSON from PuppetDB when looking up #{cap}\n#{e}"
  end
end

.search(environment, code_id, cap) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/puppet/resource/capability_finder.rb', line 57

def self.search(environment, code_id, cap)
  query_terms = [
    'and',
    ['=', 'type', cap.type.capitalize],
    ['=', 'title', cap.title.to_s],
  ]

  if environment.nil?
    query_terms << ['~', 'tag', "^producer:"]
  else
    query_terms << ['=', 'tag', "producer:#{environment}"]
  end

  unless code_id.nil?
    query_terms << ['in', 'certname',
      ['extract', 'certname',
        ['select_catalogs',
          ['=', 'code_id', code_id]]]]
  end

  Puppet.notice "Looking up capability #{cap} in PuppetDB: #{query_terms}"

  query_puppetdb(query_terms)
end