Class: Hiera::Backend::Postgres_backend

Inherits:
Object
  • Object
show all
Defined in:
lib/hiera/backend/postgres_backend.rb

Instance Method Summary collapse

Constructor Details

#initialize(cache = nil) ⇒ Postgres_backend

Returns a new instance of Postgres_backend.



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# File 'lib/hiera/backend/postgres_backend.rb', line 5

def initialize(cache=nil)
  begin
    require 'pg'
  rescue LoadError
    require 'rubygems'
    require 'pg'
  end

  @cache = cache || Filecache.new

  Hiera.debug("Hiera PostgreSQL initialized")
end

Instance Method Details

#lookup(key, scope, order_override, resolution_type) ⇒ Object 



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# File 'lib/hiera/backend/postgres_backend.rb', line 18

def lookup(key, scope, order_override, resolution_type)
  # default answer is set to nil otherwise the lookup ends up returning
  # an Array of nils and causing a Puppet::Parser::AST::Resource failed with error ArgumentError
  # for any other lookup because their default value is overwriten by [nil,nil,nil,nil]
  # so hiera('myvalue', 'test1') returns [nil,nil,nil,nil]
	results = nil

  Hiera.debug("looking up #{key} in PostgreSQL Backend")
  Hiera.debug("resolution type is #{resolution_type}")

  Backend.datasources(scope, order_override) do |source|
    Hiera.debug("Looking for data source #{source}")
    sqlfile = Backend.datafile(:postgres, scope, source, "sql") || next

    next unless File.exist?(sqlfile)
    data = @cache.read(sqlfile, Hash, {}) do |datafile|
      YAML.load(datafile)
    end

    Hiera.debug("data #{data.inspect}")
    next if data.empty?
    next unless data.include?(key)

    Hiera.debug("Found #{key} in #{source}")

    new_answer = Backend.parse_answer(data[key], scope)
    results = query(new_answer)

  end
    return results
end

#query(query) ⇒ Object 



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# File 'lib/hiera/backend/postgres_backend.rb', line 51

def query(query)
  Hiera.debug("Executing SQL Query: #{query}")

  data=nil
  pg_host = Config[:postgres][:host]
  pg_user = Config[:postgres][:user]
  pg_pass = Config[:postgres][:pass]
  pg_database = Config[:postgres][:database]
  client = PG::Connection.new(:host     => pg_host, 
                              :user     => pg_user, 
                              :password => pg_pass, 
                              :dbname   => pg_database)
  begin
    data = client.exec(query).to_a
    Hiera.debug("PostgreSQL Query returned #{data.size} rows")
  rescue => e
    Hiera.debug e.message
    data = nil
  ensure
    client.close
  end

  return data

end