Add API to allow you to get the non-transactional datastore or taskqueue.

impl/prod/context.go

Index: impl/prod/context.go
diff --git a/impl/prod/context.go b/impl/prod/context.go
index 11bd6c24e33189a6c1e815b975a15ee2ff2c7b56..48238aa5925c8b3abf7eda4459b4d96ba2c5832f 100644
--- a/impl/prod/context.go
+++ b/impl/prod/context.go
@@ -14,8 +14,9 @@ import (
 type key int
 
 var (
-	prodContextKey key
-	probeCacheKey  key = 1
+	prodContextKey     key
+	prodContextNoTxKey key = 1
+	probeCacheKey      key = 2
 )
 
 // AEContext retrieves the raw "google.golang.org/appengine" compatible Context.
@@ -24,6 +25,12 @@ func AEContext(c context.Context) context.Context {
 	return aeCtx
 }
 
+// AEContextNoTX retrieves the raw "google.golang.org/appengine" compatible Context.

[Vadim Sh., 2015/12/04 03:22:04]

document the difference between AEContextNoTX and AEContext, it's not obvious

+func AEContextNoTX(c context.Context) context.Context {
+	aeCtx, _ := c.Value(prodContextNoTxKey).(context.Context)
+	return aeCtx
+}
+
 // Use adds production implementations for all the gae services to the
 // context.
 //
@@ -40,5 +47,6 @@ func AEContext(c context.Context) context.Context {
 func Use(c context.Context, r *http.Request) context.Context {
 	aeCtx := appengine.NewContext(r)
 	c = context.WithValue(c, prodContextKey, aeCtx)
+	c = context.WithValue(c, prodContextNoTxKey, aeCtx)
 	return useUser(useURLFetch(useRDS(useMC(useTQ(useGI(c))))))
 }