better error messages

lib/fog/connection.rb

@@ -46,6 +46,9 @@ unless Fog.mocking?
         response = Fog::Response.new
         response.request = params
         response.status = @connection.readline[9..11].to_i
+        if params[:expects] && params[:expects] != response.status
+          error = true
+        end
         while true
           data = @connection.readline.chomp!
           if data == ""
@@ -55,8 +58,13 @@ unless Fog.mocking?
           response.headers[capitalize(header[0])] = header[1]
         end
 
-        if params[:parser]
+        if error || params[:parser]
-          body = Nokogiri::XML::SAX::PushParser.new(params[:parser])
+          if error
+            parser = Fog::Errors::Parser.new
+          elsif params[:parser]
+            parser = params[:parser]
+          end
+          body = Nokogiri::XML::SAX::PushParser.new(parser)
         else
           body = ''
         end
@@ -77,14 +85,14 @@ unless Fog.mocking?
           end
         end
 
-        if params[:parser]
+        if parser
           body.finish
-          response.body = params[:parser].response
+          response.body = parser.response
         else
           response.body = body
         end
 
-        if params[:expects] && params[:expects] != response.status
+        if error
           raise(Fog::Errors.status_error(params[:expects], response.status, response))
         else
           response

lib/fog/errors.rb

@@ -1,3 +1,5 @@
+require "#{File.dirname(__FILE__)}/parser"
+
 module Fog
   module Errors
     class Continue < StandardError; end # 100
@@ -124,7 +126,19 @@ module Fog
         503 => 'Service Unavailable',
         504 => 'Gateway Timeout'
       }
-      @errors[actual].new("Expected(#{expected} #{@messages[expected]}) <=> Actual(#{actual} #{@messages[actual]}) #{response.inspect}")
+      response = "#{response.body['Code']} => #{response.body['Message']}"
+      @errors[actual].new("Expected(#{expected} #{@messages[expected]}) <=> Actual(#{actual} #{@messages[actual]}): #{response}")
+    end
+
+    class Parser < Fog::Parsers::Base
+
+      def end_element(name)
+        case name
+        when 'Code', 'Message'
+          @response[name] = @value
+        end
+      end
+
     end
 
   end