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}$`)