Implement a server-side config service interface.

luci_config/server/cfgclient/naming.go

Index: luci_config/server/cfgclient/naming.go
diff --git a/luci_config/server/cfgclient/naming.go b/luci_config/server/cfgclient/naming.go
new file mode 100644
index 0000000000000000000000000000000000000000..5ef68a8739fac1e7ad5820fd1ebda098cbaf54a3
--- /dev/null
+++ b/luci_config/server/cfgclient/naming.go
@@ -0,0 +1,25 @@
+// Copyright 2016 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 cfgclient
+
+import (
+	"github.com/luci/gae/service/info"
+	"github.com/luci/luci-go/luci_config/common/cfgtypes"
+
+	"golang.org/x/net/context"
+)
+
+// ProjectConfigPath is the path of a project's project-wide configuration file.
+const ProjectConfigPath = "project.cfg"
+
+// CurrentServiceName returns the current service name, as used to identify it
+// in configurations. This is based on the current App ID.
+func CurrentServiceName(c context.Context) string { return info.TrimmedAppID(c) }
+
+// CurrentServiceConfigSet returns the config set for the current AppEngine
+// service, based on its current service name.
+func CurrentServiceConfigSet(c context.Context) cfgtypes.ConfigSet {
+	return cfgtypes.ServiceConfigSet(CurrentServiceName(c))
+}