Class: Terrafying::Components::VPC

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ VPC

Returns a new instance of VPC.



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

def initialize
  super
end

Instance Attribute Details

#azs ⇒ Object (readonly)

Returns the value of attribute azs.



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

def azs
  @azs
end

#cidr ⇒ Object (readonly)

Returns the value of attribute cidr.



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

def cidr
  @cidr
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



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

def id
  @id
end

#internal_ssh_security_group ⇒ Object (readonly)

Returns the value of attribute internal_ssh_security_group.



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

def internal_ssh_security_group
  @internal_ssh_security_group
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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

def name
  @name
end

#ssh_group ⇒ Object (readonly)

Returns the value of attribute ssh_group.



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

def ssh_group
  @ssh_group
end

#subnets ⇒ Object (readonly)

Returns the value of attribute subnets.



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

def subnets
  @subnets
end

#zone ⇒ Object (readonly)

Returns the value of attribute zone.



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

def zone
  @zone
end

Class Method Details

.create(name, cidr, options = {}) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 22

def self.create(name, cidr, options = {})
  VPC.new.create name, cidr, options
end

.find(name) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 18

def self.find(name)
  VPC.new.find name
end

Instance Method Details

#allocate_subnets!(name, options = {}) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 396

def allocate_subnets!(name, options = {})
  allocate_subnets_in!(self, name, options)
end

#allocate_subnets_in!(ctx, name, options = {}) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 400

def allocate_subnets_in!(ctx, name, options = {})
  options = {
    public: false,
    bit_size: @subnet_size,
    internet: true,
    tags: {}
  }.merge(options)

  gateways = if options[:public]
               [@internet_gateway] * @azs.count
             elsif options[:internet] && !@nat_gateways.nil?
               @nat_gateways
             else
               [nil] * @azs.count
             end
  if @subnets.has_key?(name.to_sym)

    @subnets[name.to_sym].zip(gateways).map do |subnet, gateway|
      subnet_options = { tags: { subnet_name: name }.merge(options[:tags]).merge(@tags) }
      unless gateway.nil?
        if options[:public]
          subnet_options[:gateway] = gateway
        elsif options[:internet]
          subnet_options[:nat_gateway] = gateway
        end
      end
      ctx.add! Terrafying::Components::Subnet.create_in(
       self, name, subnet.az, subnet.cidr, subnet_options
      )
    end

  else
    @subnets[name] = @azs.zip(gateways).map do |az, gateway|
      subnet_options = { tags: { subnet_name: name }.merge(options[:tags]).merge(@tags) }
      unless gateway.nil?
        if options[:public]
          subnet_options[:gateway] = gateway
        elsif options[:internet]
          subnet_options[:nat_gateway] = gateway
        end
      end

      ctx.add! Terrafying::Components::Subnet.create_in(
       self, name, az, extract_subnet!(options[:bit_size]), subnet_options
      )
    end
  end
end

#create(name, raw_cidr, options = {}) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 86

def create(name, raw_cidr, options = {})
  options = {
    subnet_size: 24,
    internet_access: true,
    nat_eips: [],
    azs: aws.availability_zones,
    tags: {},
    ssh_group: DEFAULT_SSH_GROUP
  }.merge(options)

  if options[:parent_zone].nil?
    options[:parent_zone] = Zone.find(DEFAULT_ZONE)
  end

  if options[:subnets].nil?
    options[:subnets] = if options[:internet_access]
                          {
                            public: { public: true },
                            private: { internet: true }
                          }
                        else
                          {
                            private: {}
                          }
                        end
  end

  @name = name
  @cidr = raw_cidr
  @azs = options[:azs]
  @tags = options[:tags]
  @ssh_group = options[:ssh_group]

  cidr = NetAddr::CIDR.create(raw_cidr)

  @remaining_ip_space = NetAddr::Tree.new
  @remaining_ip_space.add! cidr
  @subnet_size = options[:subnet_size]
  @subnets = {}

  per_az_subnet_size = options[:subnets].values.reduce(0) do |memo, s|
    memo + (1 << (32 - s.fetch(:bit_size, @subnet_size)))
  end
  total_subnet_size = per_az_subnet_size * @azs.count

  if total_subnet_size > cidr.size
    raise 'Not enough space for subnets in CIDR'
  end

  @id = resource :aws_vpc, name,
                 cidr_block: cidr.to_s,
                 enable_dns_hostnames: true,
                 tags: { Name: name, ssh_group: @ssh_group }.merge(@tags)

  @zone = add! Terrafying::Components::Zone.create("#{name}.#{options[:parent_zone].fqdn}",
                                                   parent_zone: options[:parent_zone],
                                                   tags: { vpc: @id }.merge(@tags))

  dhcp = resource :aws_vpc_dhcp_options, name,
                  domain_name: @zone.fqdn,
                  domain_name_servers: ['AmazonProvidedDNS'],
                  tags: { Name: name }.merge(@tags)

  resource :aws_vpc_dhcp_options_association, name,
           vpc_id: @id,
           dhcp_options_id: dhcp

  if options[:internet_access]

    if options[:nat_eips].empty?
      options[:nat_eips] = @azs.map { |az| resource :aws_eip, "#{name}-nat-gateway-#{az}", vpc: true }
    elsif options[:nat_eips].size != @azs.count
      raise 'The nubmer of nat eips has to match the number of AZs'
    end

    @internet_gateway = resource :aws_internet_gateway, name,
                                 vpc_id: @id,
                                 tags: {
                                   Name: name
                                 }.merge(@tags)
    allocate_subnets!(:nat_gateway, bit_size: 28, public: true)

    @nat_gateways = @azs.zip(@subnets[:nat_gateway], options[:nat_eips]).map do |az, subnet, eip|
      resource :aws_nat_gateway, "#{name}-#{az}",
               allocation_id: eip,
               subnet_id: subnet.id
    end

  end

  options[:subnets].each { |key, config| allocate_subnets! key, config }

  @internal_ssh_security_group = resource :aws_security_group, "#{name}-internal-ssh",
                                          name: "#{name}-internal-ssh",
                                          description: 'Allows SSH between machines inside the VPC CIDR',
                                          tags: @tags,
                                          vpc_id: @id,
                                          ingress: [
                                            {
                                              from_port: 22,
                                              to_port: 22,
                                              protocol: 'tcp',
                                              cidr_blocks: [@cidr],
                                              description: nil, 
                                              ipv6_cidr_blocks: nil, 
                                              prefix_list_ids: nil, 
                                              security_groups: nil,
                                              self: nil
                                            }
                                          ],
                                          egress: [
                                            {
                                              from_port: 22,
                                              to_port: 22,
                                              protocol: 'tcp',
                                              cidr_blocks: [@cidr],
                                              description: nil, 
                                              ipv6_cidr_blocks: nil, 
                                              prefix_list_ids: nil, 
                                              security_groups: nil,
                                              self: nil
                                            }
                                          ]
  self
end

#drop_subnet!(raw_cidr) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 381

def drop_subnet!(raw_cidr)

  cidr = NetAddr::CIDR.create(raw_cidr)
  bit_size = cidr.bits
  target = @remaining_ip_space.longest_match(cidr)

  @remaining_ip_space.delete!(target)

  if target.bits != bit_size
    target.remainder(cidr).each do |rem|
      @remaining_ip_space.add!(rem)
    end
  end
end

#extract_subnet!(bit_size) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 356

def extract_subnet!(bit_size)
  bit_size = 28 if bit_size > 28 # aws can't have smaller

  targets = @remaining_ip_space.find_space(Subnet: bit_size)

  if targets.count == 0
    raise "Run out of ip space to allocate a /#{bit_size}"
  end
  target = targets[0]

  @remaining_ip_space.delete!(target)

  if target.bits == bit_size
    new_subnet = target
  else
    new_subnet = target.subnet(Bits: bit_size, Objectify: true)[0]

    target.remainder(new_subnet).each do |rem|
      @remaining_ip_space.add!(rem)
    end
  end

  new_subnet.to_s
end

#find(name) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 30

def find(name)
  vpc = aws.vpc(name)

  @name = name
  @id = vpc.vpc_id
  @cidr = vpc.cidr_block
  @azs = aws.availability_zones
  @remaining_ip_space = NetAddr::Tree.new
  @remaining_ip_space.add! cidr
  @tags = {}
  @zone = Terrafying::Components::Zone.find_by_tag(vpc: @id)
  raise 'Failed to find zone' if @zone.nil?

  @subnets = aws.subnets_for_vpc(vpc.vpc_id).each_with_object({}) do |subnet, subnets|
    subnet_inst = Subnet.find(subnet.subnet_id)

    subnet_name_tag = subnet.tags.detect { |tag| tag.key == 'subnet_name' }

    key = if subnet_name_tag
            subnet_name_tag.value.to_sym
          else
            subnet_inst.public ? :public : :private
          end

    if subnets.key?(key)
      subnets[key] << subnet_inst
    else
      subnets[key] = [subnet_inst]
    end
  end

  # need to sort subnets so they are in az order
  @subnets.each { |_, s| s.sort! { |a, b| a.az <=> b.az } }

  @subnets.each do |_,subnet|
    subnet.each do |s|
      drop_subnet!(s.cidr)
    end
  end

  @nat_gateways = []
   aws.nat_gateways_for_vpc(vpc.vpc_id).each do |nat_gateway|
    @nat_gateways << nat_gateway.nat_gateway_id
  end

  tags = vpc.tags.select { |tag| tag.key == 'ssh_group' }
  @ssh_group = if tags.count > 0
                 tags[0].value
               else
                 DEFAULT_SSH_GROUP
               end

  @internal_ssh_security_group = aws.security_group("#{tf_safe(name)}-internal-ssh")
  self
end

#peer_with(other_vpc, options = {}) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 304

def peer_with(other_vpc, options = {})
  options = {
    complete: false,
    peerings: [
      { from: @subnets.values.flatten, to: other_vpc.subnets.values.flatten },
      { from: other_vpc.subnets.values.flatten, to: @subnets.values.flatten }
    ]
  }.merge(options)

  other_vpc_ident = tf_safe(other_vpc.name)

  our_cidr = NetAddr::CIDR.create(@cidr)
  other_cidr = NetAddr::CIDR.create(other_vpc.cidr)
  if our_cidr.contains?(other_cidr[0]) || our_cidr.contains?(other_cidr.last)
    raise 'VPCs to be peered have overlapping CIDRs'
  end

  peering_connection = resource :aws_vpc_peering_connection, "#{@name}-to-#{other_vpc_ident}",
                                peer_vpc_id: other_vpc.id,
                                vpc_id: @id,
                                auto_accept: true,
                                tags: { Name: "#{@name} to #{other_vpc.name}" }.merge(@tags)

  if options[:complete]
    our_route_tables = @subnets.values.flatten.map(&:route_table).sort.uniq
    their_route_tables = other_vpc.subnets.values.flatten.map(&:route_table).sort.uniq

    (our_route_tables.product([other_vpc.cidr]) + their_route_tables.product([@cidr])).each do |route_table, cidr|
      hash = Digest::SHA2.hexdigest "#{route_table}-#{tf_safe(cidr)}"

      resource :aws_route, "#{@name}-#{other_vpc_ident}-peer-#{hash}",
               route_table_id: route_table,
               destination_cidr_block: cidr,
               vpc_peering_connection_id: peering_connection
    end
  else
    options[:peerings].each.with_index do |peering, _i|
      route_tables = peering[:from].map(&:route_table).sort.uniq
      cidrs = peering[:to].map(&:cidr).sort.uniq

      route_tables.product(cidrs).each do |route_table, cidr|
        hash = Digest::SHA2.hexdigest "#{route_table}-#{tf_safe(cidr)}"

        resource :aws_route, "#{@name}-#{other_vpc_ident}-peer-#{hash}",
                 route_table_id: route_table,
                 destination_cidr_block: cidr,
                 vpc_peering_connection_id: peering_connection
      end
    end
  end
end

#peer_with_external(account_id, vpc_id, cidrs, options = {}) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 212

def peer_with_external(, vpc_id, cidrs, options = {})
  options = {
    region: 'eu-west-1',
    subnets: @subnets.values.flatten
  }.merge(options)

  peering_connection = resource :aws_vpc_peering_connection, "#{@name}-to-#{}-#{vpc_id}",
                                peer_owner_id: ,
                                peer_vpc_id: vpc_id,
                                peer_region: options[:region],
                                vpc_id: @id,
                                auto_accept: false,
                                tags: { Name: "#{@name} to #{}.#{vpc_id}" }.merge(@tags)

  our_route_tables = options[:subnets].map(&:route_table).sort.uniq

  our_route_tables.product(cidrs).each do |route_table, cidr|
    hash = Digest::SHA2.hexdigest "#{route_table}-#{tf_safe(cidr)}"

    resource :aws_route, "#{@name}-to-#{}-#{vpc_id}-peer-#{hash}",
             route_table_id: route_table,
             destination_cidr_block: cidr,
             vpc_peering_connection_id: peering_connection
  end
end

#peer_with_vpn(ip_address, cidrs, options = {}) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 238

def peer_with_vpn(ip_address, cidrs, options = {})
  options = {
    bgp_asn: 65_000,
    type: 'ipsec.1',
    tunnels: [],
    static_routes_only: true,
    subnets: @subnets.values.flatten
  }.merge(options)

  ident = tf_safe(Digest::SHA256.bubblebabble(ip_address)[0..11]+ip_address)

  if options[:tunnels].count > 2
    raise 'You can only define a max of two tunnels'
  end

  customer_gateway = resource :aws_customer_gateway, ident,
                              bgp_asn: options[:bgp_asn],
                              ip_address: ip_address,
                              type: options[:type],
                              tags: {
                                Name: "Connection to #{ip_address}"
                              }.merge(@tags)

  vpn_gateway = resource :aws_vpn_gateway, ident,
                         vpc_id: @id,
                         tags: {
                           Name: "Connection to #{ip_address}"
                         }.merge(@tags)

  connection_config = {
    vpn_gateway_id: vpn_gateway,
    customer_gateway_id: customer_gateway,
    type: options[:type],
    static_routes_only: options[:static_routes_only],
    tags: {
      Name: "Connection to #{ip_address}"
    }.merge(@tags)
  }

  options[:tunnels].each.with_index do |tunnel, i|
    connection_config["tunnel#{i + 1}_inside_cidr"] = tunnel[:cidr]

    if tunnel.key?(:key)
      connection_config["tunnel#{i + 1}_preshared_key"] = tunnel[:key]
    end
  end

  connection = resource :aws_vpn_connection, ident, connection_config

  cidrs.each do |cidr|
    resource :aws_vpn_connection_route, "#{ident}-#{tf_safe(cidr)}",
             destination_cidr_block: cidr,
             vpn_connection_id: connection
  end

  route_tables = options[:subnets].map(&:route_table).sort.uniq
  route_tables.product(cidrs).each do |route_table, cidr|
    hash = Digest::SHA2.hexdigest "#{route_table}-#{tf_safe(cidr)}"

    resource :aws_route, "#{@name}-to-#{tf_safe(ip_address)}-peer-#{hash}",
             route_table_id: route_table,
             destination_cidr_block: cidr,
             gateway_id: vpn_gateway
  end
end