currency_layer.rb in danconia-0.3.0

- old
+ new

@@ -2,22 +2,34 @@
 require 'net/http'
 require 'json'
 
 module Danconia
   module Exchanges
+    # Fetches the rates from https://currencylayer.com/. The `access_key` must be provided.
+    # See `examples/currency_layer.rb` for a complete usage example.
     class CurrencyLayer < Exchange
-      def initialize access_key:, **args
-        super args
+      attr_reader :store
+
+      def initialize access_key:, store: Stores::InMemory.new
         @access_key = access_key
+        @store = store
       end
 
       def fetch_rates
         response = JSON.parse Net::HTTP.get URI "http://www.apilayer.net/api/live?access_key=#{@access_key}"
         if response['success']
           response['quotes']
         else
           raise Errors::APIError, response
         end
+      end
+
+      def update_rates!
+        @store.save_rates fetch_rates.map { |pair, rate| {pair: pair, rate: rate} }
+      end
+
+      def rates **_opts
+        array_of_rates_to_hash @store.rates
       end
     end
   end
 end