Merge pull request #450 from fatkodima/better-failsafe

Do not rescue all errors for redis backed stores

Author: grzuy

lib/rack/attack/store_proxy/redis_cache_store_proxy.rb

@@ -15,33 +15,17 @@ def increment(name, amount = 1, options = {})
           #
           # 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)
+          if options[:expires_in] && !read(name)
+            write(name, amount, options)
 
-              amount
-            else
-              super
-            end
+            amount
+          else
+            super
           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
+          super(name, value, options.merge!(raw: true))
         end
       end
     end

lib/rack/attack/store_proxy/redis_proxy.rb

@@ -47,7 +47,7 @@ def delete(key, _options = {})
 
         def rescuing
           yield
-        rescue Redis::BaseError
+        rescue Redis::BaseConnectionError
           nil
         end
       end

spec/integration/offline_spec.rb

@@ -13,7 +13,11 @@
   end
 
   it 'should count' do
-    @cache.send(:do_count, 'rack::attack::cache-test-key', 1)
+    @cache.count('cache-test-key', 1)
+  end
+
+  it 'should delete' do
+    @cache.delete('cache-test-key')
   end
 end
 
@@ -29,6 +33,18 @@
   end
 end
 
+if defined?(Redis) && defined?(ActiveSupport::Cache::RedisCacheStore) && Redis::VERSION >= '4'
+  describe 'when Redis is offline' do
+    include OfflineExamples
+
+    before do
+      @cache = Rack::Attack::Cache.new
+      # Use presumably unused port for Redis client
+      @cache.store = ActiveSupport::Cache::RedisCacheStore.new(host: '127.0.0.1', port: 3333)
+    end
+  end
+end
+
 if defined?(::Dalli)
   describe 'when Memcached is offline' do
     include OfflineExamples
@@ -46,6 +62,23 @@
   end
 end
 
+if defined?(::Dalli) && defined?(::ActiveSupport::Cache::MemCacheStore)
+  describe 'when Memcached is offline' do
+    include OfflineExamples
+
+    before do
+      Dalli.logger.level = Logger::FATAL
+
+      @cache = Rack::Attack::Cache.new
+      @cache.store = ActiveSupport::Cache::MemCacheStore.new('127.0.0.1:22122')
+    end
+
+    after do
+      Dalli.logger.level = Logger::INFO
+    end
+  end
+end
+
 if defined?(Redis)
   describe 'when Redis is offline' do
     include OfflineExamples