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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) 2007-2023 VMware, Inc. or its affiliates. All rights reserved.
defmodule RabbitMQ.CLI.Core.Helpers do
alias RabbitMQ.CLI.Core.{Config, DataCoercion, NodeName}
require Record
def get_rabbit_hostname(node_name_type \\ :shortnames) do
normalise_node(Config.get_option(:node), node_name_type)
end
def normalise_node(nil, node_name_type) do
normalise_node(Config.get_option(:node), node_name_type)
end
def normalise_node(name, node_name_type) do
case NodeName.create(name, node_name_type) do
{:ok, node_name} -> node_name
other -> other
end
end
# rabbitmq/rabbitmq-cli#278
def normalise_node_option(options) do
node_opt = Config.get_option(:node, options)
longnames_opt = Config.get_option(:longnames, options)
case NodeName.create(node_opt, longnames_opt) do
{:error, _} = err ->
err
{:ok, val} ->
{:ok, Map.put(options, :node, val)}
end
end
def normalise_node_option(nil, _, _) do
nil
end
def normalise_node_option(node_opt, longnames_opt, options) do
case NodeName.create(node_opt, longnames_opt) do
{:error, _} = err ->
err
{:ok, val} ->
{:ok, Map.put(options, :node, val)}
end
end
def case_insensitive_format(%{format: format} = opts) do
%{opts | format: String.downcase(format)}
end
def case_insensitive_format(opts), do: opts
def nodes_in_cluster(node, timeout \\ :infinity) do
with_nodes_in_cluster(node, fn nodes -> nodes end, timeout)
end
def with_nodes_in_cluster(node, fun, timeout \\ :infinity) do
case :rpc.call(node, :rabbit_nodes, :list_running, [], timeout) do
{:badrpc, {:EXIT, {:undef, [{:rabbit_nodes, :list_running, [], []} | _]}}} ->
case :rpc.call(node, :rabbit_mnesia, :cluster_nodes, [:running], timeout) do
{:badrpc, _} = err -> err
value -> fun.(value)
end
{:badrpc, _} = err ->
err
value ->
fun.(value)
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
# Convert function to stream
def defer(fun) do
Stream.iterate(:ok, fn _ -> fun.() end)
|> Stream.drop(1)
|> Stream.take(1)
end
# Streamify a function sequence passing result
# Execution can be terminated by an error {:error, _}.
# The error will be the last element in the stream.
# Functions can return {:ok, val}, so val will be passed
# to then next function, or {:ok, val, output} where
# val will be passed and output will be put into the stream
def stream_until_error_parameterised(funs, init) do
Stream.transform(funs, {:just, init}, fn
f, {:just, val} ->
case f.(val) do
{:error, _} = err -> {[err], :nothing}
:ok -> {[], {:just, val}}
{:ok, new_val} -> {[], {:just, new_val}}
{:ok, new_val, out} -> {[out], {:just, new_val}}
end
_, :nothing ->
{:halt, :nothing}
end)
end
# Streamify function sequence.
# Execution can be terminated by an error {:error, _}.
# The error will be the last element in the stream.
def stream_until_error(funs) do
stream_until_error_parameterised(
Enum.map(
funs,
fn fun ->
fn :no_param ->
case fun.() do
{:error, _} = err -> err
other -> {:ok, :no_param, other}
end
end
end
),
:no_param
)
end
def atomize_values(map, keys) do
Enum.reduce(map, %{}, fn {k, v}, acc ->
case Enum.member?(keys, k) do
false -> Map.put(acc, k, v)
true -> Map.put(acc, k, DataCoercion.to_atom(v))
end
end)
end
def apply_if_exported(mod, fun, args, default) do
_ = Code.ensure_loaded(mod)
case function_exported?(mod, fun, length(args)) do
true -> apply(mod, fun, args)
false -> default
end
end
def cli_acting_user, do: "rmq-cli"
def string_or_inspect(val) do
case String.Chars.impl_for(val) do
nil ->
inspect(val)
_ ->
try do
to_string(val)
catch
_, _ -> inspect(val)
end
end
end
def evaluate_input_as_term(input) do
{:ok, tokens, _end_line} = :erl_scan.string(to_charlist(input <> "."))
{:ok, abs_form} = :erl_parse.parse_exprs(tokens)
{:value, term_value, _bs} = :erl_eval.exprs(abs_form, :erl_eval.new_bindings())
term_value
end
end
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