## 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.

defmodule RabbitMQ.CLI.Upgrade.Commands.AwaitOnlineSynchronizedMirrorCommand do
  alias RabbitMQ.CLI.Core.DocGuide

  @behaviour RabbitMQ.CLI.CommandBehaviour

  @default_timeout 120_000

  use RabbitMQ.CLI.Core.RequiresRabbitAppRunning
  use RabbitMQ.CLI.Core.AcceptsNoPositionalArguments

  def merge_defaults(args, opts) do
    timeout =
      case opts[:timeout] do
        nil -> @default_timeout
        :infinity -> @default_timeout
        val -> val
      end

    {args, Map.put(opts, :timeout, timeout)}
  end


  def run([], %{node: node_name, timeout: timeout}) do
    rpc_timeout = timeout + 500
    case :rabbit_misc.rpc_call(node_name, :rabbit_upgrade_preparation, :await_online_synchronised_mirrors, [timeout], rpc_timeout) do
      {:error, _} = err -> err
      {:error, _, _} = err -> err
      {:badrpc, _} = err -> err

      true  -> :ok
      false -> {:error, "time is up, no synchronised mirror came online for at least some classic mirrored queues"}
    end
  end

  def output({:error, msg}, %{node: node_name, formatter: "json"}) do
    {:error, %{"result" => "error", "node" => node_name, "message" => msg}}
  end
  use RabbitMQ.CLI.DefaultOutput

  def usage, do: "await_online_synchronized_mirror"

  def usage_doc_guides() do
    [
      DocGuide.mirroring(),
      DocGuide.upgrade()
    ]
  end

  def help_section, do: :upgrade

  def description() do
    "Waits for all classic mirrored queues hosted on the target node to have at least one synchronized mirror online. " <>
    "This makes sure that if target node is shut down, there will be an up-to-date mirror to promote."
  end

  def banner([], %{timeout: timeout}) do
    "Will wait for a synchronised mirror be online for all classic mirrored queues for #{round(timeout/1000)} seconds..."
  end
end
