1 files changed, 37 insertions, 0 deletions
diff --git a/models/persister.go b/models/persister.go
new file mode 100644
index 0000000..71cddc8
--- /dev/null
+++ b/models/persister.go
@@ -0,0 +1,37 @@
+package models
+
+import (
+	"github.com/dgraph-io/badger/v3"
+	"go.uber.org/zap"
+)
+
+type Persister struct {
+	log *zap.SugaredLogger
+	db  *badger.DB
+}
+
+func NewPersister(log *zap.SugaredLogger, db *badger.DB) *Persister {
+	aso := &Persister{log: log, db: db}
+	return aso
+}
+
+func (p *Persister) Store(model model) error {
+	err := p.db.Update(model.Save)
+	return err
+}
+
+func (p *Persister) Count(model model) (int, error) {
+	opts := badger.DefaultIteratorOptions
+	opts.PrefetchValues = false
+	var count int
+	err := p.db.View(func(txn *badger.Txn) error {
+		it := txn.NewIterator(opts)
+		defer it.Close()
+		prefix := []byte(model.Keybase())
+		for it.Seek(prefix); it.ValidForPrefix([]byte(prefix)); it.Next() {
+			count++
+		}
+		return nil
+	})
+	return count, err
+}