{-# 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.AppMesh.ListVirtualNodes
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Returns a list of existing virtual nodes.
--
-- This operation returns paginated results.
module Amazonka.AppMesh.ListVirtualNodes
  ( -- * Creating a Request
    ListVirtualNodes (..),
    newListVirtualNodes,

    -- * Request Lenses
    listVirtualNodes_limit,
    listVirtualNodes_meshOwner,
    listVirtualNodes_nextToken,
    listVirtualNodes_meshName,

    -- * Destructuring the Response
    ListVirtualNodesResponse (..),
    newListVirtualNodesResponse,

    -- * Response Lenses
    listVirtualNodesResponse_nextToken,
    listVirtualNodesResponse_httpStatus,
    listVirtualNodesResponse_virtualNodes,
  )
where

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

-- |
--
-- /See:/ 'newListVirtualNodes' smart constructor.
data ListVirtualNodes = ListVirtualNodes'
  { -- | The maximum number of results returned by @ListVirtualNodes@ in
    -- paginated output. When you use this parameter, @ListVirtualNodes@
    -- returns only @limit@ results in a single page along with a @nextToken@
    -- response element. You can see the remaining results of the initial
    -- request by sending another @ListVirtualNodes@ request with the returned
    -- @nextToken@ value. This value can be between 1 and 100. If you don\'t
    -- use this parameter, @ListVirtualNodes@ returns up to 100 results and a
    -- @nextToken@ value if applicable.
    limit :: Prelude.Maybe Prelude.Natural,
    -- | The Amazon Web Services IAM account ID of the service mesh owner. If the
    -- account ID is not your own, then it\'s the ID of the account that shared
    -- the mesh with your account. For more information about mesh sharing, see
    -- <https://docs.aws.amazon.com/app-mesh/latest/userguide/sharing.html Working with shared meshes>.
    meshOwner :: Prelude.Maybe Prelude.Text,
    -- | The @nextToken@ value returned from a previous paginated
    -- @ListVirtualNodes@ request where @limit@ was used and the results
    -- exceeded the value of that parameter. Pagination continues from the end
    -- of the previous results that returned the @nextToken@ value.
    nextToken :: Prelude.Maybe Prelude.Text,
    -- | The name of the service mesh to list virtual nodes in.
    meshName :: Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListVirtualNodes' 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:
--
-- 'limit', 'listVirtualNodes_limit' - The maximum number of results returned by @ListVirtualNodes@ in
-- paginated output. When you use this parameter, @ListVirtualNodes@
-- returns only @limit@ results in a single page along with a @nextToken@
-- response element. You can see the remaining results of the initial
-- request by sending another @ListVirtualNodes@ request with the returned
-- @nextToken@ value. This value can be between 1 and 100. If you don\'t
-- use this parameter, @ListVirtualNodes@ returns up to 100 results and a
-- @nextToken@ value if applicable.
--
-- 'meshOwner', 'listVirtualNodes_meshOwner' - The Amazon Web Services IAM account ID of the service mesh owner. If the
-- account ID is not your own, then it\'s the ID of the account that shared
-- the mesh with your account. For more information about mesh sharing, see
-- <https://docs.aws.amazon.com/app-mesh/latest/userguide/sharing.html Working with shared meshes>.
--
-- 'nextToken', 'listVirtualNodes_nextToken' - The @nextToken@ value returned from a previous paginated
-- @ListVirtualNodes@ request where @limit@ was used and the results
-- exceeded the value of that parameter. Pagination continues from the end
-- of the previous results that returned the @nextToken@ value.
--
-- 'meshName', 'listVirtualNodes_meshName' - The name of the service mesh to list virtual nodes in.
newListVirtualNodes ::
  -- | 'meshName'
  Prelude.Text ->
  ListVirtualNodes
newListVirtualNodes pMeshName_ =
  ListVirtualNodes'
    { limit = Prelude.Nothing,
      meshOwner = Prelude.Nothing,
      nextToken = Prelude.Nothing,
      meshName = pMeshName_
    }

-- | The maximum number of results returned by @ListVirtualNodes@ in
-- paginated output. When you use this parameter, @ListVirtualNodes@
-- returns only @limit@ results in a single page along with a @nextToken@
-- response element. You can see the remaining results of the initial
-- request by sending another @ListVirtualNodes@ request with the returned
-- @nextToken@ value. This value can be between 1 and 100. If you don\'t
-- use this parameter, @ListVirtualNodes@ returns up to 100 results and a
-- @nextToken@ value if applicable.
listVirtualNodes_limit :: Lens.Lens' ListVirtualNodes (Prelude.Maybe Prelude.Natural)
listVirtualNodes_limit = Lens.lens (\ListVirtualNodes' {limit} -> limit) (\s@ListVirtualNodes' {} a -> s {limit = a} :: ListVirtualNodes)

-- | The Amazon Web Services IAM account ID of the service mesh owner. If the
-- account ID is not your own, then it\'s the ID of the account that shared
-- the mesh with your account. For more information about mesh sharing, see
-- <https://docs.aws.amazon.com/app-mesh/latest/userguide/sharing.html Working with shared meshes>.
listVirtualNodes_meshOwner :: Lens.Lens' ListVirtualNodes (Prelude.Maybe Prelude.Text)
listVirtualNodes_meshOwner = Lens.lens (\ListVirtualNodes' {meshOwner} -> meshOwner) (\s@ListVirtualNodes' {} a -> s {meshOwner = a} :: ListVirtualNodes)

-- | The @nextToken@ value returned from a previous paginated
-- @ListVirtualNodes@ request where @limit@ was used and the results
-- exceeded the value of that parameter. Pagination continues from the end
-- of the previous results that returned the @nextToken@ value.
listVirtualNodes_nextToken :: Lens.Lens' ListVirtualNodes (Prelude.Maybe Prelude.Text)
listVirtualNodes_nextToken = Lens.lens (\ListVirtualNodes' {nextToken} -> nextToken) (\s@ListVirtualNodes' {} a -> s {nextToken = a} :: ListVirtualNodes)

-- | The name of the service mesh to list virtual nodes in.
listVirtualNodes_meshName :: Lens.Lens' ListVirtualNodes Prelude.Text
listVirtualNodes_meshName = Lens.lens (\ListVirtualNodes' {meshName} -> meshName) (\s@ListVirtualNodes' {} a -> s {meshName = a} :: ListVirtualNodes)

instance Core.AWSPager ListVirtualNodes where
  page rq rs
    | Core.stop
        ( rs
            Lens.^? listVirtualNodesResponse_nextToken
            Prelude.. Lens._Just
        ) =
        Prelude.Nothing
    | Core.stop
        (rs Lens.^. listVirtualNodesResponse_virtualNodes) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& listVirtualNodes_nextToken
          Lens..~ rs
          Lens.^? listVirtualNodesResponse_nextToken
          Prelude.. Lens._Just

instance Core.AWSRequest ListVirtualNodes where
  type
    AWSResponse ListVirtualNodes =
      ListVirtualNodesResponse
  request overrides =
    Request.get (overrides defaultService)
  response =
    Response.receiveJSON
      ( \s h x ->
          ListVirtualNodesResponse'
            Prelude.<$> (x Data..?> "nextToken")
            Prelude.<*> (Prelude.pure (Prelude.fromEnum s))
            Prelude.<*> (x Data..?> "virtualNodes" Core..!@ Prelude.mempty)
      )

instance Prelude.Hashable ListVirtualNodes where
  hashWithSalt _salt ListVirtualNodes' {..} =
    _salt
      `Prelude.hashWithSalt` limit
      `Prelude.hashWithSalt` meshOwner
      `Prelude.hashWithSalt` nextToken
      `Prelude.hashWithSalt` meshName

instance Prelude.NFData ListVirtualNodes where
  rnf ListVirtualNodes' {..} =
    Prelude.rnf limit
      `Prelude.seq` Prelude.rnf meshOwner
      `Prelude.seq` Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf meshName

instance Data.ToHeaders ListVirtualNodes where
  toHeaders =
    Prelude.const
      ( Prelude.mconcat
          [ "Content-Type"
              Data.=# ( "application/x-amz-json-1.1" ::
                          Prelude.ByteString
                      )
          ]
      )

instance Data.ToPath ListVirtualNodes where
  toPath ListVirtualNodes' {..} =
    Prelude.mconcat
      [ "/v20190125/meshes/",
        Data.toBS meshName,
        "/virtualNodes"
      ]

instance Data.ToQuery ListVirtualNodes where
  toQuery ListVirtualNodes' {..} =
    Prelude.mconcat
      [ "limit" Data.=: limit,
        "meshOwner" Data.=: meshOwner,
        "nextToken" Data.=: nextToken
      ]

-- |
--
-- /See:/ 'newListVirtualNodesResponse' smart constructor.
data ListVirtualNodesResponse = ListVirtualNodesResponse'
  { -- | The @nextToken@ value to include in a future @ListVirtualNodes@ request.
    -- When the results of a @ListVirtualNodes@ request exceed @limit@, you can
    -- use this value to retrieve the next page of results. This value is
    -- @null@ when there are no more results to return.
    nextToken :: Prelude.Maybe Prelude.Text,
    -- | The response's http status code.
    httpStatus :: Prelude.Int,
    -- | The list of existing virtual nodes for the specified service mesh.
    virtualNodes :: [VirtualNodeRef]
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'ListVirtualNodesResponse' 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:
--
-- 'nextToken', 'listVirtualNodesResponse_nextToken' - The @nextToken@ value to include in a future @ListVirtualNodes@ request.
-- When the results of a @ListVirtualNodes@ request exceed @limit@, you can
-- use this value to retrieve the next page of results. This value is
-- @null@ when there are no more results to return.
--
-- 'httpStatus', 'listVirtualNodesResponse_httpStatus' - The response's http status code.
--
-- 'virtualNodes', 'listVirtualNodesResponse_virtualNodes' - The list of existing virtual nodes for the specified service mesh.
newListVirtualNodesResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  ListVirtualNodesResponse
newListVirtualNodesResponse pHttpStatus_ =
  ListVirtualNodesResponse'
    { nextToken =
        Prelude.Nothing,
      httpStatus = pHttpStatus_,
      virtualNodes = Prelude.mempty
    }

-- | The @nextToken@ value to include in a future @ListVirtualNodes@ request.
-- When the results of a @ListVirtualNodes@ request exceed @limit@, you can
-- use this value to retrieve the next page of results. This value is
-- @null@ when there are no more results to return.
listVirtualNodesResponse_nextToken :: Lens.Lens' ListVirtualNodesResponse (Prelude.Maybe Prelude.Text)
listVirtualNodesResponse_nextToken = Lens.lens (\ListVirtualNodesResponse' {nextToken} -> nextToken) (\s@ListVirtualNodesResponse' {} a -> s {nextToken = a} :: ListVirtualNodesResponse)

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

-- | The list of existing virtual nodes for the specified service mesh.
listVirtualNodesResponse_virtualNodes :: Lens.Lens' ListVirtualNodesResponse [VirtualNodeRef]
listVirtualNodesResponse_virtualNodes = Lens.lens (\ListVirtualNodesResponse' {virtualNodes} -> virtualNodes) (\s@ListVirtualNodesResponse' {} a -> s {virtualNodes = a} :: ListVirtualNodesResponse) Prelude.. Lens.coerced

instance Prelude.NFData ListVirtualNodesResponse where
  rnf ListVirtualNodesResponse' {..} =
    Prelude.rnf nextToken
      `Prelude.seq` Prelude.rnf httpStatus
      `Prelude.seq` Prelude.rnf virtualNodes