From c3aa6782911812ff0ff602dc4eb29c738f9cad4a Mon Sep 17 00:00:00 2001
From: Ivan Kuznetsov <me@jeiwan.ru>
Date: Sun, 17 Sep 2017 11:01:18 +0700
Subject: [PATCH] Implment UTXOSet.FindUTXO

---
 utxo_set.go | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/utxo_set.go b/utxo_set.go
index 49c4c9f..0ee851d 100644
--- a/utxo_set.go
+++ b/utxo_set.go
@@ -82,3 +82,31 @@ func (u UTXOSet) GetCount() int {
 
 	return counter
 }
+
+// FindUTXO finds UTXO for a public key hash
+func (u UTXOSet) FindUTXO(pubKeyHash []byte) []TXOutput {
+	var UTXOs []TXOutput
+	db := u.Blockchain.db
+
+	err := db.View(func(tx *bolt.Tx) error {
+		b := tx.Bucket([]byte(utxoBucket))
+		c := b.Cursor()
+
+		for k, v := c.First(); k != nil; k, v = c.Next() {
+			outs := DeserializeOutputs(v)
+
+			for _, out := range outs.Outputs {
+				if out.IsLockedWithKey(pubKeyHash) {
+					UTXOs = append(UTXOs, out)
+				}
+			}
+		}
+
+		return nil
+	})
+	if err != nil {
+		log.Panic(err)
+	}
+
+	return UTXOs
+}