impl/memory: Disallow empty namespace.

service/datastore/context.go

 // 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 datastore
 
 import (
         "github.com/luci/gae/service/info"
         "golang.org/x/net/context"
 )
@@ skipping 46 matching lines @@
 // GetRawNoTxn gets the RawInterface implementation from context. If there's a
 // currently active transaction, this will return a non-transactional connection
 // to the datastore, otherwise this is the same as GetRaw.
 func GetRawNoTxn(c context.Context) RawInterface {
         return getFiltered(c, false)
 }
 
 // Get gets the Interface implementation from context.
 func Get(c context.Context) Interface {
         inf := info.Get(c)
+        ns, _ := inf.GetNamespace()
         return &datastoreImpl{
                 GetRaw(c),
                 inf.FullyQualifiedAppID(),
-                inf.GetNamespace(),
+                ns,
         }
 }
 
 // GetNoTxn gets the Interface implementation from context. If there's a
 // currently active transaction, this will return a non-transactional connection
 // to the datastore, otherwise this is the same as GetRaw.
 // Get gets the Interface implementation from context.
 func GetNoTxn(c context.Context) Interface {
         inf := info.Get(c)
+        ns, _ := inf.GetNamespace()
         return &datastoreImpl{
                 GetRawNoTxn(c),
                 inf.FullyQualifiedAppID(),
-                inf.GetNamespace(),
+                ns,
         }
 }
 
 // SetRawFactory sets the function to produce Datastore instances, as returned by
 // the GetRaw method.
 func SetRawFactory(c context.Context, rdsf RawFactory) context.Context {
         return context.WithValue(c, rawDatastoreKey, rdsf)
 }
 
 // SetRaw sets the current Datastore object in the context. Useful for testing
@@ skipping 15 matching lines @@
 func AddRawFilters(c context.Context, filts ...RawFilter) context.Context {
         if len(filts) == 0 {
                 return c
         }
         cur := getCurFilters(c)
         newFilts := make([]RawFilter, 0, len(cur)+len(filts))
         newFilts = append(newFilts, getCurFilters(c)...)
         newFilts = append(newFilts, filts...)
         return context.WithValue(c, rawDatastoreFilterKey, newFilts)
 }