Merge pull request #421 from cristiangreco/cristian/redis-cache-store-failsafe

Failsafe on Redis error replies in RedisCacheStoreProxy.

lib/rack/attack/store_proxy/redis_cache_store_proxy.rb

@@ -15,17 +15,33 @@ module Rack
           #
           # So in order to workaround this we use RedisCacheStore#write (which sets expiration) to initialize
           # the counter. After that we continue using the original RedisCacheStore#increment.
-          if options[:expires_in] && !read(name)
-            write(name, amount, options)
+          rescuing do
+            if options[:expires_in] && !read(name)
+              write(name, amount, options)
 
-            amount
-          else
-            super
+              amount
+            else
+              super
+            end
           end
         end
 
+        def read(*_args)
+          rescuing { super }
+        end
+
         def write(name, value, options = {})
-          super(name, value, options.merge!(raw: true))
+          rescuing do
+            super(name, value, options.merge!(raw: true))
+          end
+        end
+
+        private
+
+        def rescuing
+          yield
+        rescue Redis::BaseError
+          nil
         end
       end
     end