Class: Terrafying::Components::LoadBalancer

Inherits:
Terrafying::Context
  • Object
show all
Includes:
Usable
Defined in:
lib/terrafying/components/loadbalancer.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, #used_by, #used_by_cidr

Constructor Details

#initialize ⇒ LoadBalancer

Returns a new instance of LoadBalancer.



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# File 'lib/terrafying/components/loadbalancer.rb', line 25

def initialize
  super
end

Instance Attribute Details

#alias_config ⇒ Object (readonly)

Returns the value of attribute alias_config.



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# File 'lib/terrafying/components/loadbalancer.rb', line 11

def alias_config
  @alias_config
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/terrafying/components/loadbalancer.rb', line 11

def id
  @id
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/terrafying/components/loadbalancer.rb', line 11

def name
  @name
end

#ports ⇒ Object (readonly)

Returns the value of attribute ports.



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# File 'lib/terrafying/components/loadbalancer.rb', line 11

def ports
  @ports
end

#security_group ⇒ Object (readonly)

Returns the value of attribute security_group.



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# File 'lib/terrafying/components/loadbalancer.rb', line 11

def security_group
  @security_group
end

#targets ⇒ Object (readonly)

Returns the value of attribute targets.



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# File 'lib/terrafying/components/loadbalancer.rb', line 11

def targets
  @targets
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/terrafying/components/loadbalancer.rb', line 11

def type
  @type
end

Class Method Details

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



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# File 'lib/terrafying/components/loadbalancer.rb', line 17

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

.find_in(vpc, name) ⇒ Object 



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# File 'lib/terrafying/components/loadbalancer.rb', line 21

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

Instance Method Details

#alb_cert(cert_arn, port_ident) ⇒ Object 



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# File 'lib/terrafying/components/loadbalancer.rb', line 186

def alb_cert(cert_arn, port_ident)
  cert_ident = "#{port_ident}-#{Digest::SHA2.hexdigest(cert_arn)[0..8]}"

  resource :aws_lb_listener_certificate, cert_ident,
           listener_arn: "${aws_lb_listener.#{port_ident}.arn}",
           certificate_arn: cert_arn
end

#alb_certs(port, port_ident) ⇒ Object 



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# File 'lib/terrafying/components/loadbalancer.rb', line 173

def alb_certs(port, port_ident)
  return {} unless port.key? :ssl_certificate

  certs = Array(port[:ssl_certificate])
  default_cert = certs.shift
  certs.map { |cert| alb_cert(cert, port_ident) }

  {
    ssl_policy: 'ELBSecurityPolicy-TLS-1-2-2017-01',
    certificate_arn: default_cert
  }
end

#application? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/terrafying/components/loadbalancer.rb', line 194

def application?
  @type == 'application'
end

#attach(set) ⇒ Object 



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# File 'lib/terrafying/components/loadbalancer.rb', line 206

def attach(set)
  raise "Dont' know how to attach object to LB" unless set.respond_to?(:attach_load_balancer)

  set.attach_load_balancer(self)
  @security_group = set.ingress_security_group if network?
end

#autoscale(set, target_value:, disable_scale_in:) ⇒ Object 



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# File 'lib/terrafying/components/loadbalancer.rb', line 213

def autoscale(set, target_value:, disable_scale_in:)
  raise "Dont' know how to attach object to LB" unless set.respond_to?(:autoscale_on_load_balancer)

  set.autoscale_on_load_balancer(self, target_value: target_value, disable_scale_in: disable_scale_in)
end

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



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# File 'lib/terrafying/components/loadbalancer.rb', line 68

def create_in(vpc, name, options = {})
  options = {
    ports: [],
    public: false,
    subnets: vpc.subnets.fetch(:private, []),
    cross_zone_load_balancing: false,
    hex_ident: false,
    idle_timeout: nil,
    tags: {},
    security_groups: []
  }.merge(options)

  @tags = {
    Name: name
  }.merge(options[:tags])

  @hex_ident = options[:hex_ident]
  @ports = enrich_ports(options[:ports])

  l4_ports = @ports.select { |p| is_l4_port(p) }

  if l4_ports.count > 0 && l4_ports.count < @ports.count
    raise 'Ports have to either be all layer 4 or 7'
  end

  @type = l4_ports.count == 0 ? 'application' : 'network'

  ident = make_identifier(@type, vpc.name, name)
  @name = make_name(@type, vpc.name, name)

  if application?
    @security_group = resource :aws_security_group, ident,
                               name: "loadbalancer-#{@name}",
                               description: "Describe the ingress and egress of the load balancer #{@name}",
                               tags: @tags.merge(
                                 loadbalancer_name: @name
                               ),
                               vpc_id: vpc.id

    path_mtu_setup!
  end

  if network? && options[:security_groups].count > 0
    warn 'You cannot set security groups on a network loadbalancer, set them on the instances behind it.'
  end

  @id = resource :aws_lb, ident, {
    name: @name,
    load_balancer_type: type,
    internal: !options[:public],
    tags: @tags
  }.merge(subnets_for(options[:subnets]))
        .merge(application? ? { security_groups: [@security_group] + options[:security_groups], idle_timeout: options[:idle_timeout], access_logs: options[:access_logs] } : {})
        .merge(network? ? { enable_cross_zone_load_balancing: options[:cross_zone_load_balancing] } : {})
        .compact

  @targets = []

  @ports.each do |port|
    port_ident = "#{ident}-#{port[:downstream_port]}"
    port_name = "#{@name}-#{port[:downstream_port]}"

    default_action = port.key?(:action) ? port[:action] : forward_to_tg(port, port_ident, port_name, vpc)

    ssl_options = alb_certs(port, port_ident)

    listener = resource :aws_lb_listener, port_ident, {
      load_balancer_arn: @id,
      port: port[:upstream_port],
      protocol: port[:type].upcase,
      default_action: default_action
    }.merge(ssl_options)

    register_target(default_action[:target_group_arn], listener) if default_action[:type] == 'forward'
  end

  @alias_config = {
    name: output_of(:aws_lb, ident, :dns_name),
    zone_id: output_of(:aws_lb, ident, :zone_id),
    evaluate_target_health: true
  }
  self
end

#find_in(vpc, name) ⇒ Object 



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# File 'lib/terrafying/components/loadbalancer.rb', line 29

def find_in(vpc, name)
  @type = 'network'
  ident = make_identifier(@type, vpc.name, name)

  begin
    lb = aws.lb_by_name(ident)
  rescue StandardError
    @type = 'application'
    ident = make_identifier(@type, vpc.name, name)
    name = make_name(@type, vpc.name, name)

    lb = aws.lb_by_name(name)

    @security_group = aws.security_group_by_tags(loadbalancer_name: name)
  end

  @id = lb.load_balancer_arn
  @name = name

  target_groups = aws.target_groups_by_lb(@id)

  @targets = target_groups.map do |tg|
    Struct::Target.new(
      target_group: tg.target_group_arn,
      listener: nil
    )
  end

  @ports = enrich_ports(target_groups.map(&:port).sort.uniq)

  @alias_config = {
    name: lb.dns_name,
    zone_id: lb.canonical_hosted_zone_id,
    evaluate_target_health: true
  }

  self
end

#forward_to_tg(port, port_ident, port_name, vpc) ⇒ Object 



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# File 'lib/terrafying/components/loadbalancer.rb', line 152

def forward_to_tg(port, port_ident, port_name, vpc)
  target_group = resource :aws_lb_target_group, port_ident, {
    name: port_name,
    port: port[:downstream_port],
    protocol: port[:type].upcase,
    vpc_id: vpc.id
  }.merge(port.key?(:health_check) ? { health_check: port[:health_check] } : {})

  {
    type: 'forward',
    target_group_arn: target_group
  }
end

#make_identifier(type, vpc_name, name) ⇒ Object 



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# File 'lib/terrafying/components/loadbalancer.rb', line 226

def make_identifier(type, vpc_name, name)
  make_name(type, vpc_name, name).gsub(%r{^(\d)}, '_\1')
end

#make_name(type, vpc_name, name) ⇒ Object 



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# File 'lib/terrafying/components/loadbalancer.rb', line 219

def make_name(type, vpc_name, name)
  gen_id = "#{type}-#{tf_safe(vpc_name)}-#{name}"
  return Digest::SHA2.hexdigest(gen_id)[0..24] if @hex_ident || gen_id.size > 26

  gen_id[0..31]
end

#network? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/terrafying/components/loadbalancer.rb', line 202

def network?
  @type == 'network'
end

#register_target(target_group, listener) ⇒ Object 



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# File 'lib/terrafying/components/loadbalancer.rb', line 166

def register_target(target_group, listener)
  @targets << Struct::Target.new(
    target_group: target_group,
    listener: listener
  )
end

#subnets_for(subnets) ⇒ Object 



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# File 'lib/terrafying/components/loadbalancer.rb', line 198

def subnets_for(subnets)
  { subnets: subnets.map(&:id) }
end