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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



  @app_id Money.get_env(:open_exchange_rates_app_id, "")

  @api_module Money.get_env(:api_module, __MODULE__)

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



  if @app_id == "" and @api_module == __MODULE__ do

    raise ArgumentError, message: "An Open Exchange Rates app_id must be configured in config.exs"

  end



  @doc """

  Retrieves the latest exchange rates from Open Exchange Rates site.



  Returns:



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



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

  """

  @latest_endpoint "/latest.json"

  @latest_url @exr_url <> @latest_endpoint <> "?app_id=" <> @app_id

  def get_latest_rates do

    get_rates(@latest_url)

  end



  defp get_rates(url) do

    case HTTPoison.get(url) do

      {:ok, %HTTPoison.Response{status_code: 200, body: 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)



        {:ok, decimal_rates}

      {:ok, %HTTPoison.Response{status_code: 404}} ->

        {:error, "#{url} was not found"}

      {:error, %HTTPoison.Error{reason: reason}} ->

        {:error, reason}

    end

  end

end