rabbitmq-queues: validate cluster membership of the argument

Specifically of the node where new replicas should be
placed.

Closes #8007

deps/rabbitmq_cli/lib/rabbitmq/cli/core/helpers.ex

@@ -77,6 +77,11 @@ defmodule RabbitMQ.CLI.Core.Helpers do
     end
   end
 
+  def cluster_member?(target_node, node_to_check, timeout \\ 30_000) do
+    node_to_check_a = DataCoercion.to_atom(node_to_check)
+    Enum.member?(nodes_in_cluster(target_node, timeout), node_to_check_a)
+  end
+
   def node_running?(node) do
     :net_adm.ping(node) == :pong
   end

deps/rabbitmq_cli/lib/rabbitmq/cli/core/validators.ex

@@ -47,6 +47,13 @@ defmodule RabbitMQ.CLI.Core.Validators do
     end
   end
 
+  def existing_cluster_member([potential_member | _], %{node: node_name}) do
+    case Helpers.cluster_member?(node_name, potential_member) do
+      false -> {:validation_failure, {:not_a_cluster_member, potential_member}}
+      true -> :ok
+    end
+  end
+
   def data_dir_is_set(_, opts) do
     case require_data_dir(opts) do
       :ok -> :ok

deps/rabbitmq_cli/lib/rabbitmq/cli/queues/commands/add_member_command.ex

@@ -25,7 +25,16 @@ defmodule RabbitMQ.CLI.Queues.Commands.AddMemberCommand do
 
   use RabbitMQ.CLI.Core.AcceptsDefaultSwitchesAndTimeout
   use RabbitMQ.CLI.Core.AcceptsTwoPositionalArguments
-  use RabbitMQ.CLI.Core.RequiresRabbitAppRunning
+
+  def validate_execution_environment(args, opts) do
+    Validators.chain(
+      [
+        &Validators.rabbit_is_running/2,
+        &Validators.existing_cluster_member/2
+      ],
+      [args, opts]
+    )
+  end
 
   def run([name, node] = _args, %{vhost: vhost, node: node_name, timeout: timeout}) do
     case :rabbit_misc.rpc_call(node_name, :rabbit_quorum_queue, :add_member, [

deps/rabbitmq_cli/lib/rabbitmq/cli/queues/commands/grow_command.ex

@@ -5,7 +5,7 @@
 ## Copyright (c) 2007-2023 VMware, Inc. or its affiliates.  All rights reserved.
 
 defmodule RabbitMQ.CLI.Queues.Commands.GrowCommand do
-  alias RabbitMQ.CLI.Core.DocGuide
+  alias RabbitMQ.CLI.Core.{DocGuide, Validators}
   import RabbitMQ.CLI.Core.DataCoercion
 
   @behaviour RabbitMQ.CLI.CommandBehaviour
@@ -44,7 +44,15 @@ defmodule RabbitMQ.CLI.Queues.Commands.GrowCommand do
     end
   end
 
-  use RabbitMQ.CLI.Core.RequiresRabbitAppRunning
+  def validate_execution_environment(args, opts) do
+    Validators.chain(
+      [
+        &Validators.rabbit_is_running/2,
+        &Validators.existing_cluster_member/2
+      ],
+      [args, opts]
+    )
+  end
 
   def run([node, strategy], %{
         node: node_name,

deps/rabbitmq_cli/lib/rabbitmqctl.ex

@@ -393,6 +393,9 @@ defmodule RabbitMQCtl do
   defp format_validation_error(:unsupported_formatter),
     do: "the requested formatter is not supported by this command"
 
+  defp format_validation_error({:not_a_cluster_member, potential_member}),
+    do: "node #{potential_member} is not a member of the cluster"
+
   defp format_validation_error(err), do: inspect(err)
 
   @spec exit_program(integer()) :: no_return()