{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE StrictData #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# OPTIONS_GHC -fno-warn-unused-binds #-}
{-# OPTIONS_GHC -fno-warn-unused-imports #-}
{-# OPTIONS_GHC -fno-warn-unused-matches #-}

-- Derived from AWS service descriptions, licensed under Apache 2.0.

-- |
-- Module      : Amazonka.ELB.RegisterInstancesWithLoadBalancer
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Adds the specified instances to the specified load balancer.
--
-- The instance must be a running instance in the same network as the load
-- balancer (EC2-Classic or the same VPC). If you have EC2-Classic
-- instances and a load balancer in a VPC with ClassicLink enabled, you can
-- link the EC2-Classic instances to that VPC and then register the linked
-- EC2-Classic instances with the load balancer in the VPC.
--
-- Note that @RegisterInstanceWithLoadBalancer@ completes when the request
-- has been registered. Instance registration takes a little time to
-- complete. To check the state of the registered instances, use
-- DescribeLoadBalancers or DescribeInstanceHealth.
--
-- After the instance is registered, it starts receiving traffic and
-- requests from the load balancer. Any instance that is not in one of the
-- Availability Zones registered for the load balancer is moved to the
-- @OutOfService@ state. If an Availability Zone is added to the load
-- balancer later, any instances registered with the load balancer move to
-- the @InService@ state.
--
-- To deregister instances from a load balancer, use
-- DeregisterInstancesFromLoadBalancer.
--
-- For more information, see
-- <https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-deregister-register-instances.html Register or De-Register EC2 Instances>
-- in the /Classic Load Balancers Guide/.
module Amazonka.ELB.RegisterInstancesWithLoadBalancer
  ( -- * Creating a Request
    RegisterInstancesWithLoadBalancer (..),
    newRegisterInstancesWithLoadBalancer,

    -- * Request Lenses
    registerInstancesWithLoadBalancer_loadBalancerName,
    registerInstancesWithLoadBalancer_instances,

    -- * Destructuring the Response
    RegisterInstancesWithLoadBalancerResponse (..),
    newRegisterInstancesWithLoadBalancerResponse,

    -- * Response Lenses
    registerInstancesWithLoadBalancerResponse_instances,
    registerInstancesWithLoadBalancerResponse_httpStatus,
  )
where

import qualified Amazonka.Core as Core
import qualified Amazonka.Core.Lens.Internal as Lens
import qualified Amazonka.Data as Data
import Amazonka.ELB.Types
import qualified Amazonka.Prelude as Prelude
import qualified Amazonka.Request as Request
import qualified Amazonka.Response as Response

-- | Contains the parameters for RegisterInstancesWithLoadBalancer.
--
-- /See:/ 'newRegisterInstancesWithLoadBalancer' smart constructor.
data RegisterInstancesWithLoadBalancer = RegisterInstancesWithLoadBalancer'
  { -- | The name of the load balancer.
    loadBalancerName :: Prelude.Text,
    -- | The IDs of the instances.
    instances :: [Instance]
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'RegisterInstancesWithLoadBalancer' with all optional fields omitted.
--
-- Use <https://hackage.haskell.org/package/generic-lens generic-lens> or <https://hackage.haskell.org/package/optics optics> to modify other optional fields.
--
-- The following record fields are available, with the corresponding lenses provided
-- for backwards compatibility:
--
-- 'loadBalancerName', 'registerInstancesWithLoadBalancer_loadBalancerName' - The name of the load balancer.
--
-- 'instances', 'registerInstancesWithLoadBalancer_instances' - The IDs of the instances.
newRegisterInstancesWithLoadBalancer ::
  -- | 'loadBalancerName'
  Prelude.Text ->
  RegisterInstancesWithLoadBalancer
newRegisterInstancesWithLoadBalancer
  pLoadBalancerName_ =
    RegisterInstancesWithLoadBalancer'
      { loadBalancerName =
          pLoadBalancerName_,
        instances = Prelude.mempty
      }

-- | The name of the load balancer.
registerInstancesWithLoadBalancer_loadBalancerName :: Lens.Lens' RegisterInstancesWithLoadBalancer Prelude.Text
registerInstancesWithLoadBalancer_loadBalancerName = Lens.lens (\RegisterInstancesWithLoadBalancer' {loadBalancerName} -> loadBalancerName) (\s@RegisterInstancesWithLoadBalancer' {} a -> s {loadBalancerName = a} :: RegisterInstancesWithLoadBalancer)

-- | The IDs of the instances.
registerInstancesWithLoadBalancer_instances :: Lens.Lens' RegisterInstancesWithLoadBalancer [Instance]
registerInstancesWithLoadBalancer_instances = Lens.lens (\RegisterInstancesWithLoadBalancer' {instances} -> instances) (\s@RegisterInstancesWithLoadBalancer' {} a -> s {instances = a} :: RegisterInstancesWithLoadBalancer) Prelude.. Lens.coerced

instance
  Core.AWSRequest
    RegisterInstancesWithLoadBalancer
  where
  type
    AWSResponse RegisterInstancesWithLoadBalancer =
      RegisterInstancesWithLoadBalancerResponse
  request overrides =
    Request.postQuery (overrides defaultService)
  response =
    Response.receiveXMLWrapper
      "RegisterInstancesWithLoadBalancerResult"
      ( \s h x ->
          RegisterInstancesWithLoadBalancerResponse'
            Prelude.<$> ( x
                            Data..@? "Instances"
                            Core..!@ Prelude.mempty
                            Prelude.>>= Core.may (Data.parseXMLList "member")
                        )
            Prelude.<*> (Prelude.pure (Prelude.fromEnum s))
      )

instance
  Prelude.Hashable
    RegisterInstancesWithLoadBalancer
  where
  hashWithSalt
    _salt
    RegisterInstancesWithLoadBalancer' {..} =
      _salt
        `Prelude.hashWithSalt` loadBalancerName
        `Prelude.hashWithSalt` instances

instance
  Prelude.NFData
    RegisterInstancesWithLoadBalancer
  where
  rnf RegisterInstancesWithLoadBalancer' {..} =
    Prelude.rnf loadBalancerName
      `Prelude.seq` Prelude.rnf instances

instance
  Data.ToHeaders
    RegisterInstancesWithLoadBalancer
  where
  toHeaders = Prelude.const Prelude.mempty

instance
  Data.ToPath
    RegisterInstancesWithLoadBalancer
  where
  toPath = Prelude.const "/"

instance
  Data.ToQuery
    RegisterInstancesWithLoadBalancer
  where
  toQuery RegisterInstancesWithLoadBalancer' {..} =
    Prelude.mconcat
      [ "Action"
          Data.=: ( "RegisterInstancesWithLoadBalancer" ::
                      Prelude.ByteString
                  ),
        "Version"
          Data.=: ("2012-06-01" :: Prelude.ByteString),
        "LoadBalancerName" Data.=: loadBalancerName,
        "Instances"
          Data.=: Data.toQueryList "member" instances
      ]

-- | Contains the output of RegisterInstancesWithLoadBalancer.
--
-- /See:/ 'newRegisterInstancesWithLoadBalancerResponse' smart constructor.
data RegisterInstancesWithLoadBalancerResponse = RegisterInstancesWithLoadBalancerResponse'
  { -- | The updated list of instances for the load balancer.
    instances :: Prelude.Maybe [Instance],
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'RegisterInstancesWithLoadBalancerResponse' with all optional fields omitted.
--
-- Use <https://hackage.haskell.org/package/generic-lens generic-lens> or <https://hackage.haskell.org/package/optics optics> to modify other optional fields.
--
-- The following record fields are available, with the corresponding lenses provided
-- for backwards compatibility:
--
-- 'instances', 'registerInstancesWithLoadBalancerResponse_instances' - The updated list of instances for the load balancer.
--
-- 'httpStatus', 'registerInstancesWithLoadBalancerResponse_httpStatus' - The response's http status code.
newRegisterInstancesWithLoadBalancerResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  RegisterInstancesWithLoadBalancerResponse
newRegisterInstancesWithLoadBalancerResponse
  pHttpStatus_ =
    RegisterInstancesWithLoadBalancerResponse'
      { instances =
          Prelude.Nothing,
        httpStatus = pHttpStatus_
      }

-- | The updated list of instances for the load balancer.
registerInstancesWithLoadBalancerResponse_instances :: Lens.Lens' RegisterInstancesWithLoadBalancerResponse (Prelude.Maybe [Instance])
registerInstancesWithLoadBalancerResponse_instances = Lens.lens (\RegisterInstancesWithLoadBalancerResponse' {instances} -> instances) (\s@RegisterInstancesWithLoadBalancerResponse' {} a -> s {instances = a} :: RegisterInstancesWithLoadBalancerResponse) Prelude.. Lens.mapping Lens.coerced

-- | The response's http status code.
registerInstancesWithLoadBalancerResponse_httpStatus :: Lens.Lens' RegisterInstancesWithLoadBalancerResponse Prelude.Int
registerInstancesWithLoadBalancerResponse_httpStatus = Lens.lens (\RegisterInstancesWithLoadBalancerResponse' {httpStatus} -> httpStatus) (\s@RegisterInstancesWithLoadBalancerResponse' {} a -> s {httpStatus = a} :: RegisterInstancesWithLoadBalancerResponse)

instance
  Prelude.NFData
    RegisterInstancesWithLoadBalancerResponse
  where
  rnf RegisterInstancesWithLoadBalancerResponse' {..} =
    Prelude.rnf instances
      `Prelude.seq` Prelude.rnf httpStatus