Prepare boltutil for reading and writing another map

stefanberger · stefanberger · commit 02cc1485dfae · 2019-03-07T13:55:22.000-05:00
Refactor the code so that another function can also read and write maps
into the bolt db.

Signed-off-by: Stefan Berger &lt;stefanb@linux.ibm.com&gt;
diff --git a/metadata/boltutil/helpers.go b/metadata/boltutil/helpers.go
@@ -32,7 +32,11 @@ var (
 // ReadLabels reads the labels key from the bucket
 // Uses the key "labels"
 func ReadLabels(bkt *bolt.Bucket) (map[string]string, error) {
-	lbkt := bkt.Bucket(bucketKeyLabels)
+	return readMap(bkt, bucketKeyLabels)
+}
+
+func readMap(bkt *bolt.Bucket, bucketName []byte) (map[string]string, error) {
+	lbkt := bkt.Bucket(bucketName)
 	if lbkt == nil {
 		return nil, nil
 	}
@@ -53,9 +57,13 @@ func ReadLabels(bkt *bolt.Bucket) (map[string]string, error) {
 // bucket. Typically, this removes zero-value entries.
 // Uses the key "labels"
 func WriteLabels(bkt *bolt.Bucket, labels map[string]string) error {
+	return writeMap(bkt, bucketKeyLabels, labels)
+}
+
+func writeMap(bkt *bolt.Bucket, bucketName []byte, labels map[string]string) error {
 	// Remove existing labels to keep from merging
-	if lbkt := bkt.Bucket(bucketKeyLabels); lbkt != nil {
-		if err := bkt.DeleteBucket(bucketKeyLabels); err != nil {
+	if lbkt := bkt.Bucket(bucketName); lbkt != nil {
+		if err := bkt.DeleteBucket(bucketName); err != nil {
 			return err
 		}
 	}
@@ -64,7 +72,7 @@ func WriteLabels(bkt *bolt.Bucket, labels map[string]string) error {
 		return nil
 	}
 
-	lbkt, err := bkt.CreateBucket(bucketKeyLabels)
+	lbkt, err := bkt.CreateBucket(bucketName)
 	if err != nil {
 		return err
 	}
