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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.PingCommand do
alias RabbitMQ.CLI.Core.DocGuide
@behaviour RabbitMQ.CLI.CommandBehaviour
@default_timeout 60_000
def scopes(), do: [:ctl, :diagnostics]
def merge_defaults(args, opts) do
timeout =
case opts[:timeout] do
nil -> @default_timeout
:infinity -> @default_timeout
other -> other
end
{args, Map.merge(opts, %{timeout: timeout})}
end
use RabbitMQ.CLI.Core.AcceptsDefaultSwitchesAndTimeout
use RabbitMQ.CLI.Core.AcceptsNoPositionalArguments
def run([], %{node: node_name, timeout: timeout}) do
# this is very similar to what net_adm:ping/1 does reimplemented with support for custom timeouts
# and error values that are used by CLI commands
msg = "Failed to connect and authenticate to #{node_name} in #{timeout} ms"
try do
case :gen.call({:net_kernel, node_name}, :"$gen_call", {:is_auth, node()}, timeout) do
:ok ->
:ok
{:ok, _} ->
:ok
_ ->
:erlang.disconnect_node(node_name)
{:error, msg}
end
catch
:exit, _ ->
:erlang.disconnect_node(node_name)
{:error, msg}
_ ->
:erlang.disconnect_node(node_name)
{:error, msg}
end
end
def output(:ok, _) do
{:ok, "Ping succeeded"}
end
def output({:error, :timeout}, %{node: node_name}) do
{:error, RabbitMQ.CLI.Core.ExitCodes.exit_software(),
"Error: timed out while waiting for a response from #{node_name}."}
end
use RabbitMQ.CLI.DefaultOutput
def usage() do
"ping"
end
def usage_doc_guides() do
[
DocGuide.monitoring()
]
end
def help_section(), do: :observability_and_health_checks
def description(), do: "Checks that the node OS process is up, registered with EPMD and CLI tools can authenticate with it"
def banner([], %{node: node_name, timeout: timeout}) when is_number(timeout) do
"Will ping #{node_name}. This only checks if the OS process is running and registered with epmd. Timeout: #{
timeout
} ms."
end
def banner([], %{node: node_name, timeout: _timeout}) do
"Will ping #{node_name}. This only checks if the OS process is running and registered with epmd."
end
end
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