rely on httpcache for response caching

proxy/cache.go

@@ -0,0 +1,37 @@
+// Copyright 2013 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package proxy
+
+// The Cache interface defines a cache for storing arbitrary data.  The
+// interface is designed to align with httpcache.Cache.
+type Cache interface {
+	// Get retrieves the cached data for the provided key.
+	Get(key string) (data []byte, ok bool)
+
+	// Set caches the provided data.
+	Set(key string, data []byte)
+
+	// Delete deletes the cached data at the specified key.
+	Delete(key string)
+}
+
+// NopCache provides a no-op cache implementation that doesn't actually cache anything.
+var NopCache = new(nopCache)
+
+type nopCache struct{}
+
+func (c nopCache) Get(string) ([]byte, bool) { return nil, false }
+func (c nopCache) Set(string, []byte)        {}
+func (c nopCache) Delete(string)             {}