Class: Asger::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/asger/runner.rb

Instance Method Summary collapse

Constructor Details

#initialize(logger, sqs_client, ec2_client, queue_url, parameters, task_files) ⇒ Runner

Returns a new instance of Runner.

Parameters:

  • logger (Logger) —

    the logger for Asger to use

  • sqs_client (Aws::SQS::Client) —

    the SQS client to use for polling

  • ec2_client (Aws::EC2::Client) —

    the EC2 client to use to get instance information

  • queue_url (String) —

    the queue URL to poll

  • parameters (Hash) —

    a hash of parameters to pass to Tasks

  • task_files (Array<String>) —

    list of file paths to load as Tasks



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# File 'lib/asger/runner.rb', line 15

def initialize(logger, sqs_client, ec2_client, queue_url, parameters, task_files)
  @logger = logger
  @sqs_client = sqs_client
  @ec2_client = ec2_client
  @ec2_resource_client = Aws::EC2::Resource.new(client: @ec2_client)
  @queue_url = queue_url
  @parameters = Hashie::Mash.new(parameters)
  @tasks = task_files.map { |tf| Task.from_file(@logger, tf) }

  @logger.info "#{@tasks.length} task(s) set up."

  @tasks.each { |t| t.invoke_sanity_check(@parameters) }
end

Instance Method Details

#delete_message(msg) ⇒ Object (private) 



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# File 'lib/asger/runner.rb', line 71

def delete_message(msg)
  @sqs_client.delete_message(queue_url: @queue_url, receipt_handle: msg[:receipt_handle])
end

#step ⇒ Object 



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# File 'lib/asger/runner.rb', line 30

def step()
  messages = @sqs_client.receive_message(queue_url: @queue_url)[:messages]
  messages.each do |msg|
    notification = JSON.parse(JSON.parse(msg[:body])["Message"])
    if notification["Event"] != nil
      case notification["Event"].gsub("autoscaling:", "")
        when "EC2_INSTANCE_LAUNCH"
          instance_id = notification["EC2InstanceId"]
          @logger.info "Instance launched: #{instance_id}"

          instance = @ec2_resource_client.instance(instance_id)
          @tasks.each do |task|
            task.invoke_up(instance, @parameters)
          end

          delete_message(msg)
        when "EC2_INSTANCE_LAUNCH_ERROR"
          @logger.warn "Instance launch error received."
          delete_message(msg)
        when "EC2_INSTANCE_TERMINATE"
          instance_id = notification["EC2InstanceId"]
          @logger.info "Instance terminated: #{instance_id}"

          @tasks.reverse_each do |task|
            task.invoke_down(instance_id, @parameters)
          end
          delete_message(msg)
        when "EC2_INSTANCE_TERMINATE_ERROR"
          @logger.warn "Instance terminate error received."
          delete_message(msg)
        when "TEST_NOTIFICATION"
          @logger.debug "Found test notification in queue."
          delete_message(msg)
        else
          @logger.debug "Unrecognized notification '#{notification["Event"]}', ignoring."
      end
    end
  end
end