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 381

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

  if options[:public]
    gateways = [@internet_gateway] * @azs.count
  elsif options[:internet] && @nat_gateways != nil
    gateways = @nat_gateways
  else
    gateways = [nil] * @azs.count
  end

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

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

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



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# File 'lib/terrafying/components/vpc.rb', line 74

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?
    if options[:internet_access]
      options[:subnets] = {
        public: { public: true },
        private: { internet: true },
      }
    else
      options[:subnets] = {
        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) { |memo, s|
    memo + (1 << (32 - s.fetch(:bit_size, @subnet_size)))
  }
  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].size == 0
      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 { |az, subnet, eip|
      resource :aws_nat_gateway, "#{name}-#{az}", {
                 allocation_id: eip,
                 subnet_id: subnet.id,
               }
    }

  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],
                                              },
                                            ],
                                            egress: [
                                              {
                                                from_port: 22,
                                                to_port: 22,
                                                protocol: "tcp",
                                                cidr_blocks: [@cidr],
                                              },
                                            ],
                                          }
  self
end

#extract_subnet!(bit_size) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 353

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

  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 { |rem|
      @remaining_ip_space.add!(rem)
    }
  end

  return new_subnet.to_s
end

#find(name) ⇒ Object 



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# File 'lib/terrafying/components/vpc.rb', line 31

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

  @name = name
  @id = vpc.vpc_id
  @cidr = vpc.cidr_block
  @zone = Terrafying::Components::Zone.find_by_tag({vpc: @id})
  if @zone.nil?
    raise "Failed to find zone"
  end

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

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

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

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

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

  tags = vpc.tags.select { |tag| tag.key == "ssh_group"}
  if tags.count > 0
    @ssh_group = tags[0].value
  else
    @ssh_group = 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 297

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] or 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 { |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,
      }
    }
  else
    options[:peerings].each.with_index { |peering, i|
      route_tables = peering[:from].map(&:route_table).sort.uniq
      cidrs = peering[:to].map(&:cidr).sort.uniq

      route_tables.product(cidrs).each { |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

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



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

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 { |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

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



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

def peer_with_vpn(ip_address, cidrs, options={})
  options = {
    bgp_asn: 65000,
    type: "ipsec.1",
    tunnels: [],
    static_routes_only: true,
    subnets: @subnets.values.flatten,
  }.merge(options)

  ident = tf_safe(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 { |tunnel, i|
    connection_config["tunnel#{i+1}_inside_cidr"] = tunnel[:cidr]

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

  connection = resource :aws_vpn_connection, ident, connection_config

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

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

    resource :aws_route, "#{@name}-to-#{ident}-peer-#{hash}", {
               route_table_id: route_table,
               destination_cidr_block: cidr,
               gateway_id: vpn_gateway,
             }
  }

end