Class: Terrafying::Components::DynamicSet

Inherits:
Terrafying::Context
  • Object
show all
Includes:
Usable
Defined in:
lib/terrafying/components/dynamicset.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Usable

#egress_security_group, #ingress_security_group, #path_mtu_setup!, #pingable_by, #pingable_by_cidr, #security_group, #used_by, #used_by_cidr

Constructor Details

#initialize ⇒ DynamicSet

Returns a new instance of DynamicSet.



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# File 'lib/terrafying/components/dynamicset.rb', line 24

def initialize()
  super
end

Instance Attribute Details

#asg ⇒ Object (readonly)

Returns the value of attribute asg.



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# File 'lib/terrafying/components/dynamicset.rb', line 12

def asg
  @asg
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/terrafying/components/dynamicset.rb', line 12

def name
  @name
end

Class Method Details

.create_in(vpc, name, options = {}) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 16

def self.create_in(vpc, name, options={})
  DynamicSet.new.create_in vpc, name, options
end

.find_in(vpc, name) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 20

def self.find_in(vpc, name)
  DynamicSet.new.find_in vpc, name
end

Instance Method Details

#attach_load_balancer(load_balancer) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 126

def attach_load_balancer(load_balancer)
  load_balancer.target_groups.each.with_index { |target_group, i|
    resource :aws_autoscaling_attachment, "#{load_balancer.name}-#{@name}-#{i}", {
               autoscaling_group_name: @asg,
               alb_target_group_arn: target_group
             }
  }

  self.used_by(load_balancer) if load_balancer.type == "application"
end

#create_in(vpc, name, options = {}) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 34

def create_in(vpc, name, options={})
  options = {
    public: false,
    ami: aws.ami("base-image-59a5b709", owners=["136393635417"]),
    instance_type: "t2.micro",
    instances: { min: 1, max: 1, desired: 1, tags: {} },
    ports: [],
    instance_profile: nil,
    security_groups: [],
    tags: {},
    ssh_group: vpc.ssh_group,
    subnets: vpc.subnets.fetch(:private, []),
    depends_on: [],
    rolling_update: :simple,
  }.merge(options)

  ident = "#{tf_safe(vpc.name)}-#{name}"

  @name = ident
  @ports = enrich_ports(options[:ports])

  @security_group = resource :aws_security_group, ident, {
                               name: "dynamicset-#{ident}",
                               description: "Describe the ingress and egress of the service #{ident}",
                               tags: options[:tags],
                               vpc_id: vpc.id,
                               egress: [
                                 {
                                   from_port: 0,
                                   to_port: 0,
                                   protocol: -1,
                                   cidr_blocks: ["0.0.0.0/0"],
                                 }
                               ],
                             }

  path_mtu_setup!

  launch_config = resource :aws_launch_configuration, ident, {
                             name_prefix: "#{ident}-",
                             image_id: options[:ami],
                             instance_type: options[:instance_type],
                             user_data: options[:user_data],
                             iam_instance_profile: options[:instance_profile] && options[:instance_profile].id,
                             associate_public_ip_address: options[:public],
                             root_block_device: {
                               volume_type: 'gp2',
                               volume_size: 32,
                             },
                             security_groups: [
                               vpc.internal_ssh_security_group,
                               @security_group,
                             ].push(*options[:security_groups]),
                             lifecycle: {
                               create_before_destroy: true,
                             },
                             depends_on: options[:instance_profile] ? options[:instance_profile].resource_names : [],
                           }

  if options[:instances][:track]
    instances = instances_by_tags(Name: ident)
    if instances
      options[:instances] = options[:instances].merge(instances)
    end
  end

  if options.has_key?(:health_check)
    raise 'Health check needs a type and grace_period' if ! options[:health_check].has_key?(:type) and ! options[:health_check].has_key?(:grace_period)
  else
    options = {
      health_check: {
        type: "EC2",
        grace_period: 0
      },
    }.merge(options)
  end
  tags = { Name: ident, service_name: name,}.merge(options[:tags]).merge(options[:instances][:tags]).map { |k,v| { Key: k, Value: v, PropagateAtLaunch: true }}

  asg = resource :aws_cloudformation_stack, ident, {
                   name: ident,
                   disable_rollback: true,
                   template_body: generate_template(
                     options[:health_check], options[:instances], launch_config,
                     options[:subnets].map(&:id), tags, options[:rolling_update]
                   ),
                 }

  @asg = output_of(:aws_cloudformation_stack, ident, 'outputs["AsgName"]')

  self
end

#find_in(vpc, name) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 28

def find_in(vpc, name)
  @name = "#{vpc.name}-#{name}"

  self
end

#generate_template(health_check, instances, launch_config, subnets, tags, rolling_update) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 137

def generate_template(health_check, instances, launch_config, subnets,tags, rolling_update)
  template = {
    Resources: {
      AutoScalingGroup: {
        Type: "AWS::AutoScaling::AutoScalingGroup",
        Properties: {
          Cooldown: "300",
          HealthCheckType: "#{health_check[:type]}",
          HealthCheckGracePeriod: health_check[:grace_period],
          LaunchConfigurationName: "#{launch_config}",
          MaxSize: "#{instances[:max]}",
          MetricsCollection: [
            {
              Granularity: "1Minute",
              Metrics: [
                "GroupMinSize",
                "GroupMaxSize",
                "GroupDesiredCapacity",
                "GroupInServiceInstances",
                "GroupPendingInstances",
                "GroupStandbyInstances",
                "GroupTerminatingInstances",
                "GroupTotalInstances"
              ]
            },
          ],
          MinSize: "#{instances[:min]}",
          DesiredCapacity: "#{instances[:desired]}",
          Tags: tags,
          TerminationPolicies: [
            "Default"
          ],
          VPCZoneIdentifier: subnets
        }
      }
    },
    Outputs: {
      AsgName: {
        Description: "The name of the auto scaling group",
        Value: {
          Ref: "AutoScalingGroup",
        },
      },
    },
  }

  if rolling_update == :signal
    template[:Resources][:AutoScalingGroup][:UpdatePolicy] = {
      AutoScalingRollingUpdate: {
        MinInstancesInService: "#{instances[:desired]}",
        MaxBatchSize: "#{instances[:desired]}",
        PauseTime: "PT10M",
        WaitOnResourceSignals: true,
      }
    }
  elsif rolling_update
    template[:Resources][:AutoScalingGroup][:UpdatePolicy] = {
      AutoScalingRollingUpdate: {
        MinInstancesInService: "#{instances[:min]}",
        MaxBatchSize: "1",
        PauseTime: "PT0S"
      }
    }
  end

  JSON.pretty_generate(template)
end

#instances_by_tags(tags = {}) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 205

def instances_by_tags(tags = {})
  begin
    asgs = aws.asgs_by_tags(tags)

    if asgs.count != 1
      raise "Didn't find only one ASG :("
    end

    instances = {
      min: asgs[0].min_size,
      max: asgs[0].max_size,
      desired: asgs[0].desired_capacity,
    }
  rescue RuntimeError => err
    $stderr.puts("instances_by_tags: #{err}")
    instances = nil
  end

  instances
end