impl/memory: Disallow empty namespace.

filter/txnBuf/state.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 txnBuf
 
 import (
         "bytes"
         "sync"
 
@@ skipping 105 matching lines @@
         // a negative delta if the parent transaction had many large entities which
         // the inner transaction deleted.
         sizeBudget int64
         // countBudget is the number of entity writes that this transaction has to
         // operate in.
         writeCountBudget int
 }
 
 func withTxnBuf(ctx context.Context, cb func(context.Context) error, opts *datastore.TransactionOptions) error {
         inf := info.Get(ctx)
-        ns := inf.GetNamespace()
+        ns, _ := inf.GetNamespace()
 
         parentState, _ := ctx.Value(dsTxnBufParent).(*txnBufState)
         roots := stringset.New(0)
         rootLimit := 1
         if opts != nil && opts.XG {
                 rootLimit = XGTransactionGroupLimit
         }
         sizeBudget, writeCountBudget := DefaultSizeBudget, DefaultWriteCountBudget
         if parentState != nil {
                 // TODO(riannucci): this is a bit wonky since it means that a child
@@ skipping 410 matching lines @@
 // plus a stringset of all the encoded root keys that `keys` represents.
 func toEncoded(keys []*datastore.Key) (full []string, roots stringset.Set) {
         roots = stringset.New(len(keys))
         full = make([]string, len(keys))
         for i, k := range keys {
                 roots.Add(string(serialize.ToBytes(k.Root())))
                 full[i] = string(serialize.ToBytes(k))
         }
         return
 }