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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) 2019-2020 VMware, Inc. or its affiliates. All rights reserved.
defmodule RabbitMQ.CLI.Diagnostics.Commands.LogTailCommand do
@moduledoc """
Displays standard log file location on the target node
"""
@behaviour RabbitMQ.CLI.CommandBehaviour
alias RabbitMQ.CLI.Core.LogFiles
def switches, do: [number: :integer, timeout: :integer]
def aliases, do: ['N': :number, t: :timeout]
def merge_defaults(args, opts) do
{args, Map.merge(%{number: 50}, opts)}
end
use RabbitMQ.CLI.Core.AcceptsNoPositionalArguments
def run([], %{node: node_name, timeout: timeout, number: n}) do
case LogFiles.get_default_log_location(node_name, timeout) do
{:ok, file} ->
:rabbit_misc.rpc_call(node_name,
:rabbit_log_tail, :tail_n_lines, [file, n],
timeout)
error -> error
end
end
use RabbitMQ.CLI.DefaultOutput
def help_section(), do: :observability_and_health_checks
def description(), do: "Prints the last N lines of the log on the node"
def usage, do: "log_tail [--number|-N <number>]"
def usage_additional do
[
["<number>", "number of lines to print. Defaults to 50"]
]
end
def banner([], %{node: node_name, number: n}) do
"Last #{n} log lines on node #{node_name} ..."
end
end
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