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

@@ -15,6 +15,7 @@ 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.
+          rescuing do
             if options[:expires_in] && !read(name)
               write(name, amount, options)
 
@@ -23,11 +24,26 @@ module Rack
               super
             end
           end
+        end
+
+        def read(*_args)
+          rescuing { super }
+        end
 
         def write(name, value, options = {})
+          rescuing do
             super(name, value, options.merge!(raw: true))
           end
         end
+
+        private
+
+        def rescuing
+          yield
+        rescue Redis::BaseError
+          nil
+        end
+      end
     end
   end
 end