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]
  answer = 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?
    if data.include?(key)
        Hiera.debug("Found #{key} in #{source}")
        new_answer = Backend.parse_answer(data[key], scope, { 'key' => key } )
    elsif data.include?('default_query')
        Hiera.debug("Found default_query in #{source}")
        new_answer = Backend.parse_answer(data['default_query'], scope, { 'key' => key } )
    else
        next
    end

    case resolution_type
    when :array
      raise Exception, "Hiera type mismatch: expected Array and got #{new_answer.class}" unless new_answer.kind_of? Array or new_answer.kind_of? String
      answer ||= []
      answer << query(new_answer)
    when :hash
      raise Exception, "Hiera type mismatch: expected Hash and got #{new_answer.class}" unless new_answer.kind_of? Hash
      answer ||= {}
      answer = Backend.merge_answer(query(new_answer),answer)
    else
      answer = query(new_answer)
      if answer.length == 0
        answer = nil
        next
      end
      break
    end

  end
  unless answer.kind_of? String 
      if answer==nil or answer.empty?
          answer = nil
      end
  end
  return answer
end

#query(query) ⇒ Object 



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# File 'lib/hiera/backend/postgres_backend.rb', line 77

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 = PGconn.open(:host     => pg_host, 
                       :user     => pg_user, 
                       :password => pg_pass, 
                       :dbname   => pg_database)
  begin
     rows=client.exec(query)
     if rows.fields().count==1 and rows.count()==1
        data=rows[0][rows.fields()[0]]
     elsif rows.fields().count==1 and rows.count()>1
        ary=Array.new
        rows.each { |row| ary.push(row[rows.fields()[0]]) }
        data=ary
     else
        data = rows.to_a
     end
     Hiera.debug("returned rows " + rows.count().to_s + " columns " + rows.fields.count().to_s)
  rescue => e
    Hiera.debug e.message
    data = nil
  ensure
    client.close
  end

  return data

end