#
# Cookbook Name:: alb_support
# Recipe:: attach_to_alb
#
# Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
#     http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
#
chef_gem "aws-sdk-core" do
  version "~> 2.6"
  action :install
end

ruby_block "attach to ALB" do
  block do
    require "aws-sdk-core"

    raise "alb_helper block not specified in layer JSON" if node[:alb_helper].nil?
    raise "Target group ARN not specified in layer JSON" if node[:alb_helper][:target_group_arn].nil?

    stack = search("aws_opsworks_stack").first
    instance = search("aws_opsworks_instance", "self:true").first

    stack_region = stack[:region]
    ec2_instance_id = instance[:ec2_instance_id]
    target_group_arn = node[:alb_helper][:target_group_arn]

    Chef::Log.info("Creating ELB client in region #{stack_region}")
    client = Aws::ElasticLoadBalancingV2::Client.new(region: stack_region)

    Chef::Log.info("Registering EC2 instance #{ec2_instance_id} with target group #{target_group_arn}")

    target_to_attach = {
      target_group_arn: target_group_arn,
      targets: [{ id: ec2_instance_id }]
    }

    client.register_targets(target_to_attach)
  end
  action :run
end