Merge pull request #165 from danschultzer/surface-retriever-startup-e…

…rror

Surface retriever startup error

lib/money/exchange_rates/exchange_rates_supervisor.ex

@@ -38,7 +38,7 @@ defmodule Money.ExchangeRates.Supervisor do
     options = Keyword.merge(default_options(), options)
     if options[:restart], do: stop()
     supervisor = start_link()
-    if options[:start_retriever], do: ExchangeRates.Retriever.start()
+    if options[:start_retriever], do: start_retriever!()
     supervisor
   end
 
@@ -189,4 +189,11 @@ defmodule Money.ExchangeRates.Supervisor do
   defp retriever_spec(config) do
     %{id: @child_name, start: {@child_name, :start_link, [@child_name, config]}}
   end
+
+  defp start_retriever! do
+    case ExchangeRates.Retriever.start() do
+      {:ok, _pid} -> :ok
+      {:error, reason} -> raise "Unhandled error starting retriever; #{inspect reason}"
+    end
+  end
 end