lib/echonest/api.rb in ruby-echonest-0.1.2 vs lib/echonest/api.rb in ruby-echonest-0.2.0

@@ -1,9 +1,10 @@
 # -*- coding: utf-8 -*-
 require 'digest/md5'
 require 'httpclient'
 require 'json'
+require 'fileutils'
 
 module Echonest
   class Api
     BASE_URL = 'http://developer.echonest.com/api/v4/'
     USER_AGENT = '%s/%s' % ['ruby-echonest', ::Echonest::VERSION]
@@ -102,16 +103,26 @@
           @api.request('track/upload', :post, options)
         end
       end
 
       def analysis(filename)
-        analysis_url = analysis_url(filename)
-        Analysis.new_from_url(analysis_url)
-      end
-
-      def analysis_url(filename)
         md5 = Digest::MD5.hexdigest(open(filename).read)
+        cache_path = DIRECTORY + 'analysis' + md5
 
+        if File.exists?(cache_path)
+          analysis = Analysis.new(open(cache_path).read)
+        else
+          analysis = Analysis.new_from_url(analysis_url(filename, md5))
+          cache_path.dirname.mkpath
+          open(cache_path, 'w') do |file|
+            file.write analysis.json
+          end
+        end
+
+        analysis
+      end
+
+      def analysis_url(filename, md5)
         while true
           begin
             response = profile(:md5 => md5)
           rescue Api::Error => e
             if e.message =~ /^The Identifier specified does not exist/