github.com/timstclair/heapster@v0.20.0-alpha1/Godeps/_workspace/src/google.golang.org/appengine/namespace.go (about) 1 // Copyright 2012 Google Inc. All rights reserved. 2 // Use of this source code is governed by the Apache 2.0 3 // license that can be found in the LICENSE file. 4 5 package appengine 6 7 import ( 8 "fmt" 9 "regexp" 10 11 "golang.org/x/net/context" 12 13 "google.golang.org/appengine/internal" 14 ) 15 16 // Namespace returns a replacement context that operates within the given namespace. 17 func Namespace(c context.Context, namespace string) (context.Context, error) { 18 if !validNamespace.MatchString(namespace) { 19 return nil, fmt.Errorf("appengine: namespace %q does not match /%s/", namespace, validNamespace) 20 } 21 return internal.NamespacedContext(c, namespace), nil 22 } 23 24 // validNamespace matches valid namespace names. 25 var validNamespace = regexp.MustCompile(`^[0-9A-Za-z._-]{0,100}$`)