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Money functions for operations on and localization of a money data type with support for ISO 4217 currencies and ISO 24165 digial tokens (crypto currencies).

Retired package: Deprecated
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ex_money lib money exchange_rates open_exchange_rates.ex
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lib/money/exchange_rates/open_exchange_rates.ex 

defmodule Money.ExchangeRates.OpenExchangeRates do

  @behaviour Money.ExchangeRates



  @doc """

  Retrieves the latest exchange rates from Open Exchange Rates site.



  * `app_id` is a valid Open Exchange Rates app_id.  Defaults to the

  configured `app_id` in `config.exs`



  Returns:



  * `{:ok, rates}` if the rates can be retrieved



  * `{:error, reason}` if rates cannot be retrieved



  Typically this function is called by the exchange rates retrieval

  service although it can be called outside that context as

  required.

  """



  @open_exchange_rate_url "https://openexchangerates.org/api"



  @spec get_latest_rates(Money.ExchangeRates.Config.t) :: {:ok, Map.t} | {:error, String.t}

  def get_latest_rates(_config) do

    url    = Money.get_env(:open_exchange_rates_url, @open_exchange_rate_url)

    app_id = Money.get_env(:open_exchange_rates_app_id, nil)



    get_rates(url, app_id)

  end



  defp get_rates(_url, nil) do

    {:error, "Open Exchange Rates app_id is not configured.  Rates are not retrieved."}

  end



  @latest_rates "/latest.json"

  defp get_rates(url, app_id) do

    get_rates(url <> @latest_rates <> "?app_id=" <> app_id)

  end



  defp get_rates(url) do

    case :httpc.request(String.to_charlist(url)) do

      {:ok, {{_version, 200, 'OK'}, _headers, body}} ->

        %{"base" => _base, "rates" => rates} = Poison.decode!(body)



        decimal_rates = rates

        |> Cldr.Map.atomize_keys

        |> Enum.map(fn {k, v} -> {k, Decimal.new(v)} end)

        |> Enum.into(%{})



        {:ok, decimal_rates}



      {_, {{_version, code, message}, _headers, _body}} ->

        {:error, "#{code} #{message}"}



      {:error, {:failed_connect, [{_, {_host, _port}}, {_, _, sys_message}]}} ->

        {:error, sys_message}

    end

  end

end