LogDog: Use live object cache for configs.

logdog/server/service/service.go

Index: logdog/server/service/service.go
diff --git a/logdog/server/service/service.go b/logdog/server/service/service.go
index c40480784ead406b0b2019ab6f5de3feca3b9974..8d896a002a4e6667e69402703fcd48f8f857c335 100644
--- a/logdog/server/service/service.go
+++ b/logdog/server/service/service.go
@@ -97,6 +97,7 @@ type Service struct {
 	killCheckInterval clockflag.Duration
 	configFilePath    string
 	serviceConfig     svcconfig.Config
+	configCache       config.ProcCache
 
 	// serviceID is the cloud project ID, which is also this service's unique
 	// ID. This can be specified by flag or, if on GCE, will automatically be
@@ -414,11 +415,12 @@ func (s *Service) ProjectConfig(c context.Context, proj cfgtypes.ProjectName) (*
 	cset, path := s.ProjectConfigPath(proj)
 
 	var pcfg svcconfig.ProjectConfig
-	if err := cfgclient.Get(c, cfgclient.AsService, cset, path, textproto.Message(&pcfg), nil); err != nil {
+	msg, err := s.configCache.GetTextProto(c, cset, path, &pcfg)
+	if err != nil {
 		return nil, errors.Annotate(err).Reason("failed to load project config from %(cset)s.%(path)s").
 			D("cset", cset).D("path", path).Err()
 	}
-	return &pcfg, nil
+	return msg.(*svcconfig.ProjectConfig), nil
 }
 
 // SetShutdownFunc sets the service shutdown function.