server/auth: Add in-process LRU-based cache.

appengine/gaemiddleware/context.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package gaemiddleware
 
 import (
         "net/http"
 
         "golang.org/x/net/context"
@@ skipping 37 matching lines @@
         // It is indirectly stateful (since NewDBCache returns a stateful object that
         // keeps AuthDB cache in local memory), and thus it's defined as a long living
         // global variable.
         //
         // Used in prod contexts only.
         globalAuthConfig = auth.Config{
                 DBProvider:          authdb.NewDBCache(server.GetAuthDB),
                 Signer:              gaesigner.Signer{},
                 AccessTokenProvider: client.GetAccessToken,
                 AnonymousTransport:  urlfetch.Get,
-                GlobalCache:         &server.Memcache{Namespace: "__luciauth__"},
+                Cache:               &server.Memcache{Namespace: "__luciauth__"},
         }
 
         // globalTsMonState holds state related to time series monitoring.
         globalTsMonState = &tsmon.State{}
 )
 
 // WithProd installs the set of standard production AppEngine services:
 //   * github.com/luci/luci-go/common/logging (set default level to debug).
 //   * github.com/luci/gae/impl/prod (production appengine services)
 //   * github.com/luci/luci-go/appengine/gaeauth/client (appengine urlfetch transport)
@@ skipping 47 matching lines @@
 // BaseProd returns a list of middleware: WithProd middleware, a panic catcher if this
 // is not a devserver, and the monitoring middleware.
 func BaseProd() router.MiddlewareChain {
         if appengine.IsDevAppServer() {
                 return router.NewMiddlewareChain(ProdServices, globalTsMonState.Middleware)
         }
         return router.NewMiddlewareChain(
                 ProdServices, middleware.WithPanicCatcher, globalTsMonState.Middleware,
         )
 }