Added proper redirection, improved loading error display

storage/bolt/qurl.go

@@ -158,3 +158,34 @@ func (stor *BoltStorage) GetQURLByURL(u string) (*qurl.QURL, error) {
 
 	return q, nil
 }
+
+func (stor *BoltStorage) GetQURLByID(id uint64) (*qurl.QURL, error) {
+	tx, err := stor.DB.Begin(false)
+	if err != nil {
+		return nil, err
+	}
+	defer tx.Rollback()
+
+	// Create a byte array from the ID
+	bid := make([]byte, 8)
+	binary.BigEndian.PutUint64(bid, id)
+
+	rb := tx.Bucket(QURLBucket)
+	if rb == nil {
+		return nil, nil
+	}
+
+	qb := rb.Bucket(bid)
+	if qb == nil {
+		return nil, nil
+	}
+
+	q := &qurl.QURL{ID: id}
+
+	qu := qb.Get(URLField)
+	if qu != nil {
+		q.URL = string(qu)
+	}
+
+	return q, nil
+}

storage/storage.go

@@ -11,6 +11,7 @@ import (
 type Storage interface {
 	AddQURL(*qurl.QURL) error
 	GetQURLByURL(string) (*qurl.QURL, error)
+	GetQURLByID(uint64) (*qurl.QURL, error)
 	SetQURLSequence(uint64) error
 	Backup(string) error
 	Shutdown()