func (qs *QuadStore) UpdateValueKeyBy(name quad.Value, amount int64, batch *leveldb.Batch) error {
value := proto.NodeData{
Value: proto.MakeValue(name),
Size: amount,
}
key := createValueKeyFor(name)
b, err := qs.db.Get(key, qs.readopts)
// Error getting the node from the database.
if err != nil && err != leveldb.ErrNotFound {
glog.Errorf("Error reading Value %s from the DB.", name)
return err
}
// Node exists in the database -- unmarshal and update.
if b != nil && err != leveldb.ErrNotFound {
var oldvalue proto.NodeData
err = oldvalue.Unmarshal(b)
if err != nil {
glog.Errorf("Error: could not reconstruct value: %v", err)
return err
}
oldvalue.Size += amount
value = oldvalue
}
// Are we deleting something?
if value.Size <= 0 {
value.Size = 0
}
// Repackage and rewrite.
bytes, err := value.Marshal()
if err != nil {
glog.Errorf("could not write to buffer for value %s: %s", name, err)
return err
}
if batch == nil {
qs.db.Put(key, bytes, qs.writeopts)
} else {
batch.Put(key, bytes)
}
return nil
}
func (qs *QuadStore) UpdateValueKeyBy(name quad.Value, amount int64, tx *bolt.Tx) error {
value := proto.NodeData{
Value: proto.MakeValue(name),
Size: amount,
}
b := tx.Bucket(nodeBucket)
b.FillPercent = localFillPercent
key := qs.createValueKeyFor(name)
data := b.Get(key)
if data != nil {
// Node exists in the database -- unmarshal and update.
var oldvalue proto.NodeData
err := oldvalue.Unmarshal(data)
if err != nil {
glog.Errorf("Error: couldn't reconstruct value: %v", err)
return err
}
oldvalue.Size += amount
value = oldvalue
}
// Are we deleting something?
if value.Size <= 0 {
value.Size = 0
}
// Repackage and rewrite.
bytes, err := value.Marshal()
if err != nil {
glog.Errorf("Couldn't write to buffer for value %s: %s", name, err)
return err
}
err = b.Put(key, bytes)
return err
}