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## 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) 2016-2020 VMware, Inc. or its affiliates. All rights reserved.
defmodule RabbitMQ.CLI.Ctl.Commands.RenameClusterNodeCommand do
require Integer
alias RabbitMQ.CLI.Core.{DocGuide, Validators}
import RabbitMQ.CLI.Core.DataCoercion
@behaviour RabbitMQ.CLI.CommandBehaviour
def merge_defaults(args, opts), do: {args, opts}
def validate(args, _) when length(args) < 2 do
{:validation_failure, :not_enough_args}
end
def validate(_, _) do
:ok
end
def validate_execution_environment(args, opts) do
Validators.chain(
[
&validate_args_count_even/2,
&Validators.node_is_not_running/2,
&Validators.mnesia_dir_is_set/2,
&Validators.feature_flags_file_is_set/2,
&Validators.rabbit_is_loaded/2
],
[args, opts]
)
end
def run(nodes, %{node: node_name}) do
node_pairs = make_node_pairs(nodes)
try do
:rabbit_mnesia_rename.rename(node_name, node_pairs)
catch
_, reason ->
{:rename_failed, reason}
end
end
use RabbitMQ.CLI.DefaultOutput
def usage() do
"rename_cluster_node <oldnode1> <newnode1> [oldnode2] [newnode2] ..."
end
def usage_additional() do
[
["<oldnode>", "Original node name"],
["<newnode>", "New node name"]
]
end
def usage_doc_guides() do
[
DocGuide.clustering()
]
end
def help_section(), do: :cluster_management
def description(), do: "Renames cluster nodes in the local database"
def banner(args, _) do
[
"Renaming cluster nodes: \n ",
for {node_from, node_to} <- make_node_pairs(args) do
"#{node_from} -> #{node_to} \n"
end
]
|> List.flatten()
|> Enum.join()
end
#
# Implementation
#
defp validate_args_count_even(args, _) do
case agrs_count_even?(args) do
true ->
:ok
false ->
{:validation_failure,
{:bad_argument, "Argument list should contain even number of nodes"}}
end
end
defp agrs_count_even?(args) do
Integer.is_even(length(args))
end
defp make_node_pairs([]) do
[]
end
defp make_node_pairs([from, to | rest]) do
[{to_atom(from), to_atom(to)} | make_node_pairs(rest)]
end
end
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