Add server/cache support to gaeconfig.

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"
         "google.golang.org/appengine"
 
         "github.com/luci/gae/filter/dscache"
         "github.com/luci/gae/impl/prod"
         "github.com/luci/gae/service/urlfetch"
 
-        "github.com/luci/luci-go/common/config"
         "github.com/luci/luci-go/common/data/caching/cacheContext"
         "github.com/luci/luci-go/common/data/caching/proccache"
         "github.com/luci/luci-go/common/logging"
 
         "github.com/luci/luci-go/server/auth"
         "github.com/luci/luci-go/server/auth/authdb"
         "github.com/luci/luci-go/server/middleware"
         "github.com/luci/luci-go/server/router"
         "github.com/luci/luci-go/server/settings"
 
@@ skipping 52 matching lines @@
 
         // Fetch and apply configuration stored in the datastore.
         cachedSettings := fetchCachedSettings(c)
         c = logging.SetLevel(c, cachedSettings.LoggingLevel)
         if !cachedSettings.DisableDSCache {
                 c = dscache.AlwaysFilterRDS(c)
         }
 
         // The rest of the service may use applied configuration.
         c = proccache.Use(c, globalProcessCache)
-        c = config.SetImplementation(c, gaeconfig.New(c))
+        c = gaeconfig.Use(c)
         c = gaesecrets.Use(c, nil)
         c = auth.SetConfig(c, globalAuthConfig)
         return cacheContext.Wrap(c)
 }
 
 // ProdServices is a middleware that installs the set of standard production
 // AppEngine services by calling WithProd.
 func ProdServices(c *router.Context, next router.Handler) {
         c.Context = WithProd(c.Context, c.Request)
         next(c)
 }
 
 // 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,
         )
 }