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 22

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 10

def asg
  @asg
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/terrafying/components/dynamicset.rb', line 10

def name
  @name
end

#stack ⇒ Object (readonly)

Returns the value of attribute stack.



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# File 'lib/terrafying/components/dynamicset.rb', line 10

def stack
  @stack
end

Class Method Details

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



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# File 'lib/terrafying/components/dynamicset.rb', line 14

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 18

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 167

def attach_load_balancer(load_balancer)
  load_balancer.targets.each.with_index do |target, i|
    resource :aws_autoscaling_attachment, "#{load_balancer.name}-#{@name}-#{i}".gsub(%r{^(\d)}, '_\1'),
             autoscaling_group_name: @asg,
             alb_target_group_arn: target.target_group
  end

  used_by(load_balancer) if load_balancer.application?
end

#autoscale_on_load_balancer(load_balancer, target_value:, disable_scale_in:) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 177

def autoscale_on_load_balancer(load_balancer, target_value:, disable_scale_in:)
  load_balancer.targets.each.with_index do |target, i|
    policy_ident = "#{load_balancer.name}-#{@name}-#{i}".gsub(%r{^(\d)}, '_\1')
    policy_name = "#{load_balancer.name}-#{@name}-#{i}"
    lb_arn = load_balancer.id.to_s.gsub(/id/, 'arn_suffix')
    tg_arn = target.target_group.to_s.gsub(/id/, 'arn_suffix')
    listener = "aws_lb_listener.#{target.listener.to_s.split('.')[1]}"
    autoscaling_attachment = "aws_autoscaling_attachment.#{policy_ident}"

    resource :aws_autoscaling_policy, policy_ident,
             name: policy_name,
             autoscaling_group_name: @asg,
             policy_type: 'TargetTrackingScaling',
             target_tracking_configuration: {
               predefined_metric_specification: {
                 predefined_metric_type: 'ALBRequestCountPerTarget',
                 resource_label: "#{lb_arn}/#{tg_arn}"
               },
               target_value: target_value,
               disable_scale_in: disable_scale_in
             },
             depends_on: [listener, autoscaling_attachment]
  end
end

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



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# File 'lib/terrafying/components/dynamicset.rb', line 32

def create_in(vpc, name, options = {})
  options = {
    public: false,
    eip: false,
    ami: aws.ami('base-image-fc-75aa2aef', owners = ['477284023816']),
    instance_type: 't3a.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,
    metadata_options: nil,
    vpc_endpoints_egress: []
  }.merge(options)

  metadata_options = options[:metadata_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

  vpc_endpoints_egress = options[:vpc_endpoints_egress]
  if vpc_endpoints_egress.empty?
    default_egress_rule(ident, @security_group)
  else
    vpc_endpoint_egress_rules(ident, @security_group, vpc, vpc_endpoints_egress)
  end

  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: profile_from(options[:instance_profile]),
                           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
                           },
                           metadata_options: options[:metadata_options],
                           depends_on: resource_name_from(options[:instance_profile])

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

  if options.key?(:health_check)
    raise 'Health check needs a type and grace_period' if !options[:health_check].key?(:type) && !options[:health_check].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].fetch(:tags, {})).map { |k, v| { Key: k, Value: v, PropagateAtLaunch: true } }

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

  @stack = "arn:aws:cloudformation:#{aws.region}:#{aws.}:stack/#{ident}/*"

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

  self
end

#default_egress_rule(ident, security_group) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 149

def default_egress_rule(ident, security_group)
  resource :aws_security_group_rule, "#{ident}-default-egress",
           security_group_id: security_group,
           type: 'egress',
           from_port: 0,
           to_port: 0,
           protocol: -1,
           cidr_blocks: ['0.0.0.0/0']
end

#find_in(vpc, name) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 26

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 202

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]).to_s,
          HealthCheckGracePeriod: health_check[:grace_period],
          LaunchConfigurationName: launch_config.to_s,
          MetricsCollection: [
            {
              Granularity: '1Minute',
              Metrics: %w[
                GroupMinSize
                GroupMaxSize
                GroupDesiredCapacity
                GroupInServiceInstances
                GroupPendingInstances
                GroupStandbyInstances
                GroupTerminatingInstances
                GroupTotalInstances
              ]
            }
          ],
          MaxSize: instances[:max].to_s,
          MinSize: instances[:min].to_s,
          DesiredCapacity: instances[:desired] ? instances[:desired].to_s : nil,
          Tags: tags,
          TerminationPolicies: [
            'Default'
          ],
          VPCZoneIdentifier: subnets
        }.compact
      }
    },
    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]).to_s,
        MaxBatchSize: (instances[:desired]).to_s,
        PauseTime: 'PT10M',
        WaitOnResourceSignals: true,
        SuspendProcesses: %w[HealthCheck ReplaceUnhealthy AZRebalance AlarmNotification ScheduledActions]
      }
    }
  elsif rolling_update
    template[:Resources][:AutoScalingGroup][:UpdatePolicy] = {
      AutoScalingRollingUpdate: {
        MinInstancesInService: (instances[:min]).to_s,
        MaxBatchSize: '1',
        PauseTime: 'PT0S',
        SuspendProcesses: %w[HealthCheck ReplaceUnhealthy AZRebalance AlarmNotification ScheduledActions]
      }
    }
  end

  JSON.pretty_generate(template)
end

#instances_by_tags(tags = {}) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 272

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

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

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

  instances
end

#profile_from(profile) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 159

def profile_from(profile)
  profile.respond_to?(:id) ? profile.id : profile
end

#resource_name_from(profile) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 163

def resource_name_from(profile)
  profile.respond_to?(:resource_name) ? [profile.resource_name] : []
end

#vpc_endpoint_egress_rules(ident, security_group, vpc, vpc_endpoints) ⇒ Object 



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# File 'lib/terrafying/components/dynamicset.rb', line 131

def vpc_endpoint_egress_rules(ident, security_group, vpc, vpc_endpoints)
  prefix_ids = vpc_endpoints.map do | e |
    vpc_endpoint = data :aws_vpc_endpoint, "#{ident}-#{tf_safe(e)}", {
      vpc_id: vpc.id,
      service_name: e,
    }
    vpc_endpoint[:prefix_list_id]
  end

  resource :aws_security_group_rule, "#{ident}-vpc-endpoint-egress",
           security_group_id: security_group,
           type: 'egress',
           from_port: 0,
           to_port: 0,
           protocol: -1,
           prefix_list_ids: prefix_ids
end