ubicloud/model/load_balancer.rb

#  frozen_string_literal: true

require_relative "../model"

class LoadBalancer < Sequel::Model
  many_to_one :project
  many_to_many :vms
  one_to_one :strand, key: :id
  many_to_one :private_subnet
  one_to_many :load_balancers_vms, key: :load_balancer_id, class: :LoadBalancersVms
  one_to_many :ports, key: :load_balancer_id, class: :LoadBalancerPort
  many_to_many :certs, join_table: :certs_load_balancers, left_key: :load_balancer_id, right_key: :cert_id
  one_to_many :certs_load_balancers, key: :load_balancer_id, class: :CertsLoadBalancers
  many_to_one :custom_hostname_dns_zone, class: :DnsZone, key: :custom_hostname_dns_zone_id
  many_to_many :vm_ports, join_table: :load_balancer_port, right_key: :id, right_primary_key: :load_balancer_port_id, class: :LoadBalancerVmPort, read_only: true
  many_to_many :active_vm_ports, join_table: :load_balancer_port, right_key: :id, right_primary_key: :load_balancer_port_id, class: :LoadBalancerVmPort, read_only: true, conditions: {state: "up"}
  many_through_many :vms_to_dns, [[:load_balancer_port, :load_balancer_id, :id], [:load_balancer_vm_port, :load_balancer_port_id, :load_balancer_vm_id], [:load_balancers_vms, :id, :vm_id]], class: :Vm, conditions: Sequel.~(Sequel[:load_balancer_vm_port][:state] => ["evacuating", "detaching"])

  plugin :association_dependencies, load_balancers_vms: :destroy, ports: :destroy, certs_load_balancers: :destroy

  include ResourceMethods
  include SemaphoreMethods
  include ObjectTag::Cleanup
  dataset_module Pagination
  semaphore :destroy, :update_load_balancer, :rewrite_dns_records, :refresh_cert

  def display_location
    private_subnet.display_location
  end

  def path
    "/location/#{private_subnet.display_location}/load-balancer/#{name}"
  end

  def vm_ports_by_vm(vm)
    vm_ports_dataset.where(load_balancer_vm_id: load_balancers_vms_dataset.where(vm_id: vm.id).select(:id))
  end

  def vm_ports_by_vm_and_state(vm, state)
    vm_ports_dataset.where(load_balancer_vm_id: load_balancers_vms_dataset.where(vm_id: vm.id).select(:id), state:)
  end

  def add_port(src_port, dst_port)
    DB.transaction do
      port = LoadBalancerPort.create(load_balancer_id: id, src_port:, dst_port:)
      load_balancers_vms.each do |lb_vm|
        LoadBalancerVmPort.create(load_balancer_port_id: port.id, load_balancer_vm_id: lb_vm.id)
      end
      incr_update_load_balancer
    end
  end

  def remove_port(port)
    DB.transaction do
      vm_ports_dataset.where(load_balancer_port_id: port.id).destroy
      port.destroy
      incr_update_load_balancer
    end
  end

  def add_vm(vm)
    DB.transaction do
      load_balancer_vm = LoadBalancersVms.create(load_balancer_id: id, vm_id: vm.id)
      ports.each { |port|
        LoadBalancerVmPort.create(load_balancer_port_id: port.id, load_balancer_vm_id: load_balancer_vm.id)
      }
      Strand.create_with_id(prog: "Vnet::CertServer", label: "put_certificate", stack: [{subject_id: id, vm_id: vm.id}], parent_id: id)
      incr_rewrite_dns_records
    end
  end

  def detach_vm(vm)
    DB.transaction do
      ids_to_update = vm_ports_by_vm_and_state(vm, ["up", "down", "evacuating"]).map(&:id)
      LoadBalancerVmPort.where(id: ids_to_update).update(state: "detaching")
      Strand.create_with_id(prog: "Vnet::CertServer", label: "remove_cert_server", stack: [{subject_id: id, vm_id: vm.id}], parent_id: id)
      incr_update_load_balancer
    end
  end

  def evacuate_vm(vm)
    DB.transaction do
      ids_to_update = vm_ports_by_vm_and_state(vm, ["up", "down"]).map(&:id)
      LoadBalancerVmPort.where(id: ids_to_update).update(state: "evacuating")
      Strand.create_with_id(prog: "Vnet::CertServer", label: "remove_cert_server", stack: [{subject_id: id, vm_id: vm.id}], parent_id: id)
      incr_update_load_balancer
      incr_rewrite_dns_records
    end
  end

  def remove_vm(vm)
    DB.transaction do
      vm_ports_by_vm(vm).destroy
      load_balancers_vms_dataset[vm_id: vm.id].destroy
      incr_rewrite_dns_records
    end
  end

  def remove_vm_port(vm_port)
    DB.transaction do
      LoadBalancerVmPort.where(id: vm_port.id).destroy
      if vm_ports_dataset.where(load_balancer_vm_id: vm_port.load_balancer_vm_id).count.zero?
        load_balancers_vms_dataset[id: vm_port.load_balancer_vm_id].destroy
      end
      incr_rewrite_dns_records
    end
  end

  def hostname
    custom_hostname || "#{name}.#{private_subnet.ubid[-5...]}.#{Config.load_balancer_service_hostname}"
  end

  def dns_zone
    custom_hostname_dns_zone || DnsZone[project_id: Config.load_balancer_service_project_id, name: Config.load_balancer_service_hostname]
  end

  def need_certificates?
    return true if certs_dataset.empty?

    certs_dataset.where { created_at > Time.now - 60 * 60 * 24 * 30 * 2 }.exclude(cert: nil).empty?
  end

  def active_cert
    certs_dataset.where { created_at > Time.now - 60 * 60 * 24 * 30 * 3 }.exclude(cert: nil).order(Sequel.desc(:created_at)).first
  end

  def ipv4_enabled?
    stack == Stack::IPV4 || stack == Stack::DUAL
  end

  def ipv6_enabled?
    stack == Stack::IPV6 || stack == Stack::DUAL
  end

  module Stack
    IPV4 = "ipv4"
    IPV6 = "ipv6"
    DUAL = "dual"
  end
end

# Table: load_balancer
# Columns:
#  id                          | uuid           | PRIMARY KEY
#  name                        | text           | NOT NULL
#  algorithm                   | lb_algorithm   | NOT NULL DEFAULT 'round_robin'::lb_algorithm
#  private_subnet_id           | uuid           | NOT NULL
#  health_check_endpoint       | text           | NOT NULL
#  health_check_interval       | integer        | NOT NULL DEFAULT 10
#  health_check_timeout        | integer        | NOT NULL DEFAULT 5
#  health_check_up_threshold   | integer        | NOT NULL DEFAULT 5
#  health_check_down_threshold | integer        | NOT NULL DEFAULT 3
#  health_check_protocol       | lb_hc_protocol | NOT NULL DEFAULT 'http'::lb_hc_protocol
#  custom_hostname             | text           |
#  custom_hostname_dns_zone_id | uuid           |
#  stack                       | lb_stack       | NOT NULL DEFAULT 'dual'::lb_stack
#  project_id                  | uuid           | NOT NULL
# Indexes:
#  load_balancer_pkey                        | PRIMARY KEY btree (id)
#  load_balancer_custom_hostname_key         | UNIQUE btree (custom_hostname)
#  load_balancer_private_subnet_id_name_uidx | UNIQUE btree (private_subnet_id, name)
# Check constraints:
#  health_check_down_threshold_gt_0              | (health_check_down_threshold > 0)
#  health_check_interval_gt_0                    | (health_check_interval > 0)
#  health_check_interval_lt_600                  | (health_check_interval < 600)
#  health_check_timeout_gt_0                     | (health_check_timeout > 0)
#  health_check_timeout_lt_health_check_interval | (health_check_timeout <= health_check_interval)
#  health_check_up_threshold_gt_0                | (health_check_up_threshold > 0)
# Foreign key constraints:
#  load_balancer_custom_hostname_dns_zone_id_fkey | (custom_hostname_dns_zone_id) REFERENCES dns_zone(id)
#  load_balancer_private_subnet_id_fkey           | (private_subnet_id) REFERENCES private_subnet(id)
#  load_balancer_project_id_fkey                  | (project_id) REFERENCES project(id)
# Referenced By:
#  certs_load_balancers | certs_load_balancers_load_balancer_id_fkey | (load_balancer_id) REFERENCES load_balancer(id)
#  inference_endpoint   | inference_endpoint_load_balancer_id_fkey   | (load_balancer_id) REFERENCES load_balancer(id)
#  inference_router     | inference_router_load_balancer_id_fkey     | (load_balancer_id) REFERENCES load_balancer(id)
#  kubernetes_cluster   | kubernetes_cluster_api_server_lb_id_fkey   | (api_server_lb_id) REFERENCES load_balancer(id)
#  load_balancer_port   | load_balancer_port_load_balancer_id_fkey   | (load_balancer_id) REFERENCES load_balancer(id)
#  load_balancers_vms   | load_balancers_vms_load_balancer_id_fkey   | (load_balancer_id) REFERENCES load_balancer(id)