LogDog: Support per-namespace expired archival.

appengine/logdog/coordinator/project.go

Index: appengine/logdog/coordinator/project.go
diff --git a/appengine/logdog/coordinator/project.go b/appengine/logdog/coordinator/project.go
new file mode 100644
index 0000000000000000000000000000000000000000..4534c4f04c354675c4fe414e5d90a2f3e3c0a183
--- /dev/null
+++ b/appengine/logdog/coordinator/project.go
@@ -0,0 +1,31 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package coordinator
+
+import (
+	"strings"
+
+	"github.com/luci/luci-go/common/config"
+)
+
+const projectNamespacePrefix = "luci."
+
+// ProjectNamespace returns the AppEngine namespace for a given luci-config
+// project name.
+func ProjectNamespace(project config.ProjectName) string {
+	return projectNamespacePrefix + string(project)
+}
+
+// ProjectFromNamespace returns the current project installed in the supplied
+// Context's namespace.
+//
+// If the namespace does not have a project namespace prefix, this function
+// will return an empty string.
+func ProjectFromNamespace(ns string) config.ProjectName {
+	if !strings.HasPrefix(ns, projectNamespacePrefix) {
+		return ""
+	}
+	return config.ProjectName(ns[len(projectNamespacePrefix):])
+}