mobilizon/lib/service/workers/refresh_instances.ex

defmodule Mobilizon.Service.Workers.RefreshInstances do
  @moduledoc """
  Worker to refresh the instances materialized view and the relay actors
  """

  use Oban.Worker, unique: [period: :infinity, keys: [:event_uuid, :action]]

  alias Mobilizon.Actors.Actor
  alias Mobilizon.Federation.ActivityPub.Actor, as: ActivityPubActor
  alias Mobilizon.Federation.ActivityPub.Relay
  alias Mobilizon.Instances
  alias Mobilizon.Instances.Instance
  alias Oban.Job

  @impl Oban.Worker
  @spec perform(Oban.Job.t()) :: :ok
  def perform(%Job{}) do
    Instances.refresh()

    Instances.all_domains()
    |> Enum.each(&refresh_instance_actor/1)
  end

  @spec refresh_instance_actor(Instance.t()) ::
          {:ok, Mobilizon.Actors.Actor.t()}
          | {:error,
             ActivityPubActor.make_actor_errors()
             | Mobilizon.Federation.WebFinger.finger_errors()}
  def refresh_instance_actor(%Instance{domain: nil}) do
    {:error, :not_remote_instance}
  end

  def refresh_instance_actor(%Instance{domain: domain}) do
    %Actor{url: url} = Relay.get_actor()
    %URI{host: host} = URI.new!(url)

    if host == domain do
      {:error, :not_remote_instance}
    else
      ActivityPubActor.find_or_make_actor_from_nickname("relay@#{domain}")
    end
  end
end