Class: CfnManage::StartStopHandler::Rds

Inherits:
Object
  • Object
show all
Defined in:
lib/cfn_manage/handlers/rds.rb

Instance Method Summary collapse

Constructor Details

#initialize(instance_id, options = {}) ⇒ Rds

Returns a new instance of Rds.



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# File 'lib/cfn_manage/handlers/rds.rb', line 8

def initialize(instance_id, options = {})
  @instance_id = instance_id
  @excluded_engines = %w(aurora aurora-mysql aurora-postgresql) # RDS list of exluded engines that don't support RDS stop start
  credentials = CfnManage::AWSCredentials.get_session_credentials("startstoprds_#{instance_id}")
  @rds_client = Aws::RDS::Client.new(retry_limit: 20)
  if credentials != nil
    @rds_client = Aws::RDS::Client.new(credentials: credentials, retry_limit: 20)
  end
  rds = Aws::RDS::Resource.new(client: @rds_client)
  @rds_instance = rds.db_instance(instance_id)

end

Instance Method Details

#start(configuration) ⇒ Object 



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# File 'lib/cfn_manage/handlers/rds.rb', line 21

def start(configuration)
  if @excluded_engines.include? @rds_instance.engine
     $log.info("RDS Instance #{@instance_id} engine is #{@rds_instance.engine} and cannot be started by instance.")
     return
  end

  if @rds_instance.db_instance_status == 'available'
    $log.info("RDS Instance #{@instance_id} is already in available state")
  end

  # start rds instance
  if @rds_instance.db_instance_status == 'stopped'
    $log.info("Starting db instance #{@instance_id}")
    @rds_client.start_db_instance({ db_instance_identifier: @instance_id })

    # wait instance to become available
    unless CfnManage.skip_wait?
      $log.info("Waiting db instance to become available #{@instance_id}")
      wait('available')
    end
  else
    wait('available') unless CfnManage.skip_wait?
  end

  # convert rds instance to mutli-az if required
  if configuration['is_multi_az']
    $log.info("Converting to Multi-AZ instance after start (instance #{@instance_id})")
    set_rds_instance_multi_az( true)
  end unless configuration.nil?
end

#stop ⇒ Object 



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# File 'lib/cfn_manage/handlers/rds.rb', line 52

def stop

  configuration = {
      is_multi_az: @rds_instance.multi_az
  }
  # RDS list of exluded engines that don't support RDS stop start
  if @excluded_engines.include? @rds_instance.engine
     $log.info("RDS Instance #{@instance_id} engine is #{@rds_instance.engine} and cannot be stoped by instance.")
     return configuration
  end

  # check if available
  if @rds_instance.db_instance_status != 'available'
    $log.warn("RDS Instance #{@instance_id} not in available state, and thus can not be stopped")
    $log.warn("RDS Instance #{@instance_id} state: #{@rds_instance.db_instance_status}")
    return configuration
  end

  # check if already stopped
  if @rds_instance.db_instance_status == 'stopped'
    $log.info("RDS Instance #{@instance_id} is already stopped")
    return configuration
  end

  #check if mutli-az RDS. if so, convert to single-az
  if @rds_instance.multi_az
    $log.info("Converting to Non-Multi-AZ instance before stop (instance #{@instance_id}")
    set_rds_instance_multi_az(false)
  end

  # stop rds instance and wait for it to be fully stopped
  $log.info("Stopping instance #{@instance_id}")
  @rds_client.stop_db_instance({ db_instance_identifier: @instance_id })
  unless CfnManage.skip_wait?
    $log.info("Waiting db instance to be stopped #{@instance_id}")
    wait('stopped')
  end

  return configuration
end

#wait(completed_state) ⇒ Object 



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# File 'lib/cfn_manage/handlers/rds.rb', line 103

def wait(completed_state)
  # reached state must be steady, at least a minute. Modifying an instance to/from MultiAZ can't be shorter
  # than 40 seconds, hence steady count is 4
  state_count = 0
  steady_count = 4
  attempts = 0
  rds = Aws::RDS::Resource.new(client: @rds_client)
  until attempts == (max_attempts = 60*6) do
    instance = rds.db_instance(@instance_id)
    $log.info("Instance #{instance.db_instance_identifier} state: #{instance.db_instance_status}, waiting for #{completed_state}")

    if instance.db_instance_status == "#{completed_state}"
      state_count = state_count + 1
      $log.info("#{state_count}/#{steady_count}")
    else
      state_count = 0
    end
    break if state_count == steady_count
    attempts = attempts + 1
    sleep(15)
  end

  if attempts == max_attempts
    $log.error("RDS Database Instance #{@instance_id} did not enter #{state} state, however continuing operations...")
  end
end