pleroma/lib/mix/tasks/relay_follow.ex

defmodule Mix.Tasks.RelayFollow do
  use Mix.Task
  require Logger
  alias Pleroma.Web.ActivityPub.Relay

  @shortdoc "Follows a remote relay"
  @moduledoc """
  Follows a remote relay

  Usage: ``mix relay_follow <relay_url>``

  Example: ``mix relay_follow https://example.org/relay``
  """
  def run([target]) do
    Mix.Task.run("app.start")

    with {:ok, activity} <- Relay.follow(target) do
      # put this task to sleep to allow the genserver to push out the messages
      :timer.sleep(500)
    else
      {:error, e} -> Mix.shell().error("Error while following #{target}: #{inspect(e)}")
    end
  end
end