Extract LastFm.API.ErrorResponse

lib/last_fm/api/error_response.ex

@@ -0,0 +1,50 @@
+defmodule LastFm.API.ErrorResponse do
+  defstruct [:error, :message]
+
+  def new(error_code, message) do
+    %__MODULE__{error: map_error(error_code), message: message}
+  end
+
+  defp map_error(2), do: :invalid_service
+  defp map_error(3), do: :invalid_method
+  defp map_error(4), do: :authentication_failed
+  defp map_error(5), do: :invalid_format
+  defp map_error(6), do: :invalid_parameters
+  defp map_error(7), do: :invalid_resource
+  defp map_error(8), do: :operation_failed
+  defp map_error(9), do: :invalid_session_key
+  defp map_error(10), do: :invalid_api_key
+  defp map_error(11), do: :service_offline
+  defp map_error(13), do: :invalid_method_signature
+  defp map_error(16), do: :transient_error
+  defp map_error(26), do: :suspended_api_key
+  defp map_error(29), do: :rate_limit_exceeded
+
+  @doc """
+  Returns true if the error is retryable, false otherwise.
+  """
+  def retryable_error?(error)
+      when error in [
+             :transient_error,
+             :service_offline,
+             :rate_limit_exceeded,
+             :operation_failed
+           ],
+      do: true
+
+  def retryable_error?(_error), do: false
+
+  @doc """
+  Returns the recommended retry delay in milliseconds for retryable errors.
+  Returns nil for non-retryable errors.
+  """
+  # 1 minute
+  def retry_delay(:rate_limit_exceeded), do: 60_000
+  # 30 seconds
+  def retry_delay(:service_offline), do: 30_000
+  # 5 seconds
+  def retry_delay(:transient_error), do: 5_000
+  # 5 seconds
+  def retry_delay(:operation_failed), do: 5_000
+  def retry_delay(_), do: nil
+end