add read/write methods to cache

lib/rack/attack/cache.rb

@@ -29,6 +29,14 @@ module Rack
         do_count(key, expires_in)
       end
 
+      def read(unprefixed_key)
+        store.read("#{prefix}:#{unprefixed_key}")
+      end
+      
+      def write(unprefixed_key, value, expires_in)
+        store.write("#{prefix}:#{unprefixed_key}", value, :expires_in => expires_in)
+      end
+
       private
       def do_count(key, expires_in)
         # Workaround Redis::Store's interface

spec/rack_attack_cache_spec.rb

@@ -51,6 +51,28 @@ if ENV['TEST_INTEGRATION']
             @cache.send(:do_count, @key, @expires_in).must_equal 1
           end
         end
+        
+        describe "write" do
+          it "should write a value to the store with prefix" do
+            @cache.write("cache-test-key", "foobar", 1)
+            store.read(@key).must_equal "foobar"
+          end
+        end
+          
+        describe "write after expiry" do
+          it "must not have a value" do
+            @cache.write("cache-test-key", "foobar", @expires_in)
+            sleep @expires_in # tick... tick... tick...
+            store.read(@key).must_be :nil?
+          end
+        end
+        
+        describe "read" do
+          it "must read the value with a prefix" do
+            store.write(@key, "foobar", :expires_in => @expires_in)
+            @cache.read("cache-test-key").must_equal "foobar"
+          end
+        end
       end
 
     end