1 files changed, 68 insertions, 0 deletions
diff --git a/deps/rabbitmq_mqtt/src/Elixir.RabbitMQ.CLI.Ctl.Commands.DecommissionMqttNodeCommand.erl b/deps/rabbitmq_mqtt/src/Elixir.RabbitMQ.CLI.Ctl.Commands.DecommissionMqttNodeCommand.erl
new file mode 100644
index 0000000000..f0aefb526b
--- /dev/null
+++ b/deps/rabbitmq_mqtt/src/Elixir.RabbitMQ.CLI.Ctl.Commands.DecommissionMqttNodeCommand.erl
@@ -0,0 +1,68 @@
+%% This Source Code Form is subject to the terms of the Mozilla Public
+%% License, v. 2.0. If a copy of the MPL was not distributed with this
+%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
+%%
+%% Copyright (c) 2007-2020 VMware, Inc. or its affiliates.  All rights reserved.
+
+-module('Elixir.RabbitMQ.CLI.Ctl.Commands.DecommissionMqttNodeCommand').
+
+-include("rabbit_mqtt.hrl").
+
+-behaviour('Elixir.RabbitMQ.CLI.CommandBehaviour').
+
+-export([scopes/0,
+         switches/0,
+         aliases/0,
+         usage/0,
+         usage_doc_guides/0,
+         banner/2,
+         validate/2,
+         merge_defaults/2,
+         run/2,
+         output/2,
+         description/0,
+         help_section/0]).
+
+scopes() -> [ctl].
+switches() -> [].
+aliases() -> [].
+
+description() -> <<"Removes cluster member and permanently deletes its cluster-wide MQTT state">>.
+
+help_section() ->
+    {plugin, mqtt}.
+
+validate([], _Opts) ->
+    {validation_failure, not_enough_args};
+validate([_, _ | _], _Opts) ->
+    {validation_failure, too_many_args};
+validate([_], _) ->
+    ok.
+
+merge_defaults(Args, Opts) ->
+    {Args, Opts}.
+
+usage() ->
+    <<"decommission_mqtt_node <node>">>.
+
+usage_doc_guides() ->
+    [?MQTT_GUIDE_URL].
+
+run([Node], #{node := NodeName,
+              timeout := Timeout}) ->
+    case rabbit_misc:rpc_call(NodeName, rabbit_mqtt_collector, leave, [Node], Timeout) of
+        {badrpc, _} = Error ->
+            Error;
+        nodedown ->
+            {ok, list_to_binary(io_lib:format("Node ~s is down but has been successfully removed"
+                                         " from the cluster", [Node]))};
+        Result ->
+            %% 'ok' or 'timeout'
+            %% TODO: Ra will timeout if the node is not a cluster member - should this be fixed??
+            Result
+    end.
+
+banner([Node], _) -> list_to_binary(io_lib:format("Removing node ~s from the list of MQTT nodes...", [Node])).
+
+output(Result, _Opts) ->
+    'Elixir.RabbitMQ.CLI.DefaultOutput':output(Result).