Mark Do()/With() transaction as managed.

Transaction created from Do() and With() are now considered "managed".
Managed transactions cannot be manually committed or rolled back since
the Do() and With() functions provide that functionally automatically.
Previously, a Tx could be manually committed and then any changes after
that would be lost.

1 files changed, 7 insertions, 1 deletions

diff --git a/tx.go b/tx.go
index 181444e..c18fbf7 100644
--- a/tx.go
+++ b/tx.go
@@ -18,6 +18,7 @@ type txid uint64
 // quickly grow.
 type Tx struct {
 	writable bool
+	managed  bool
 	db       *DB
 	meta     *meta
 	buckets  *buckets
@@ -155,7 +156,9 @@ func (t *Tx) DeleteBucket(name string) error {
 // Commit writes all changes to disk and updates the meta page.
 // Returns an error if a disk write error occurs.
 func (t *Tx) Commit() error {
-	if t.db == nil {
+	if t.managed {
+		panic("managed tx commit not allowed")
+	} else if t.db == nil {
 		return nil
 	} else if !t.writable {
 		t.Rollback()
@@ -194,6 +197,9 @@ func (t *Tx) Commit() error {
 
 // Rollback closes the transaction and ignores all previous updates.
 func (t *Tx) Rollback() {
+	if t.managed {
+		panic("managed tx rollback not allowed")
+	}
 	t.close()
 }