Class: Hiera::Backend::Mysql2_backend

Inherits:
Object
  • Object
show all
Defined in:
lib/hiera/backend/mysql2_backend.rb

Instance Method Summary collapse

Constructor Details

#initialize(cache = nil) ⇒ Mysql2_backend

Returns a new instance of Mysql2_backend.



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# File 'lib/hiera/backend/mysql2_backend.rb', line 5

def initialize(cache=nil)
  if defined?(JRUBY_VERSION)
    require 'jdbc/mysql'
    require 'java'
  else
    begin
      require 'mysql2'
    rescue LoadError
      require 'rubygems'
      require 'mysql2'
    end
  end

  @cache = cache || Filecache.new

  Hiera.debug("Hiera MySQL2 initialized")
end

Instance Method Details

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



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# File 'lib/hiera/backend/mysql2_backend.rb', line 23

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 MySQL2 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(:mysql2, scope, source, "sql") || next

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

    mysql_config = data.fetch(:dbconfig, {})
    mysql_host = mysql_config.fetch(:host, nil) || Config[:mysql2][:host] || 'localhost'
    mysql_user = mysql_config.fetch(:user, nil) || Config[:mysql2][:user]
    mysql_pass = mysql_config.fetch(:pass, nil) || Config[:mysql2][:pass]
    mysql_port = mysql_config.fetch(:port, nil) || Config[:mysql2][:port] || '3306'
    mysql_database = mysql_config.fetch(:database, nil) || Config[:mysql2][:database]

    connection_hash = {
      :host => mysql_host,
      :username => mysql_user,
      :password => mysql_pass,
      :database => mysql_database,
      :port => mysql_port,
      :reconnect => true}


    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(connection_hash, new_answer)

  end
  return results
end

#query(connection_hash, query) ⇒ Object 



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# File 'lib/hiera/backend/mysql2_backend.rb', line 72

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

  data=[]
  mysql_host=connection_hash[:host]
  mysql_user=connection_hash[:username]
  mysql_pass=connection_hash[:password]
  mysql_database=connection_hash[:database]
  mysql_port=connection_hash[:port]

  if defined?(JRUBY_VERSION)
    Jdbc::MySQL.load_driver
    url = "jdbc:mysql://#{mysql_host}:#{mysql_port}/#{mysql_database}"
    props = java.util.Properties.new
    props.set_property :user, mysql_user
    props.set_property :password, mysql_pass

    conn = com.mysql.jdbc.Driver.new.connect(url,props)
    stmt = conn.create_statement

    res = stmt.execute_query(query)
    md = res.getMetaData
    numcols = md.getColumnCount

    Hiera.debug("Mysql Query returned #{numcols} rows")

    while ( res.next ) do
      if numcols < 2
        Hiera.debug("Mysql value : #{res.getString(1)}")
        data << res.getString(1)
      else
        row = {}
        (1..numcols).each do |c|
          row[md.getColumnName(c)] = res.getString(c)
        end
        data << row
      end
    end

  else
    client = Mysql2::Client.new(connection_hash)
    begin
      data = client.query(query).to_a
      Hiera.debug("Mysql Query returned #{data.size} rows")
    rescue => e
      Hiera.debug e.message
      data = nil
    ensure
      client.close
    end
  end

  return data

end