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.



25
26
27
 
# 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.



11
12
13
 
# File 'lib/terrafying/components/loadbalancer.rb', line 11

def alias_config
  @alias_config
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



11
12
13
 
# File 'lib/terrafying/components/loadbalancer.rb', line 11

def id
  @id
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



11
12
13
 
# File 'lib/terrafying/components/loadbalancer.rb', line 11

def name
  @name
end

#ports ⇒ Object (readonly)

Returns the value of attribute ports.



11
12
13
 
# File 'lib/terrafying/components/loadbalancer.rb', line 11

def ports
  @ports
end

#security_group ⇒ Object (readonly)

Returns the value of attribute security_group.



11
12
13
 
# File 'lib/terrafying/components/loadbalancer.rb', line 11

def security_group
  @security_group
end

#targets ⇒ Object (readonly)

Returns the value of attribute targets.



11
12
13
 
# File 'lib/terrafying/components/loadbalancer.rb', line 11

def targets
  @targets
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



11
12
13
 
# File 'lib/terrafying/components/loadbalancer.rb', line 11

def type
  @type
end

Class Method Details

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



17
18
19
 
# 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 



21
22
23
 
# 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 



198
199
200
201
202
203
204
 
# File 'lib/terrafying/components/loadbalancer.rb', line 198

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 



185
186
187
188
189
190
191
192
193
194
195
196
 
# File 'lib/terrafying/components/loadbalancer.rb', line 185

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) 


206
207
208
 
# File 'lib/terrafying/components/loadbalancer.rb', line 206

def application?
  @type == 'application'
end

#attach(set) ⇒ Object 



218
219
220
221
222
223
 
# File 'lib/terrafying/components/loadbalancer.rb', line 218

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

#authenticate_oidc(oidc_config) ⇒ Object 



171
172
173
174
175
176
 
# File 'lib/terrafying/components/loadbalancer.rb', line 171

def authenticate_oidc(oidc_config)
  {
    type: "authenticate-oidc",
    authenticate_oidc: oidc_config
  }
end

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



225
226
227
228
229
 
# File 'lib/terrafying/components/loadbalancer.rb', line 225

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 



68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
 
# 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]}"

    actions = []

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

    actions.append(authenticate_oidc(port[:oidc_config])) if !port[:oidc_config].nil?
    actions.append(default_action)

    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: actions
    }.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 



29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
 
# 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 



157
158
159
160
161
162
163
164
165
166
167
168
169
 
# File 'lib/terrafying/components/loadbalancer.rb', line 157

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 



238
239
240
 
# File 'lib/terrafying/components/loadbalancer.rb', line 238

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 



231
232
233
234
235
236
 
# File 'lib/terrafying/components/loadbalancer.rb', line 231

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) 


214
215
216
 
# File 'lib/terrafying/components/loadbalancer.rb', line 214

def network?
  @type == 'network'
end

#register_target(target_group, listener) ⇒ Object 



178
179
180
181
182
183
 
# File 'lib/terrafying/components/loadbalancer.rb', line 178

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

#subnets_for(subnets) ⇒ Object 



210
211
212
 
# File 'lib/terrafying/components/loadbalancer.rb', line 210

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