From 37cb60a0b5d929f4a677cbe20d6f7af01855daf8 Mon Sep 17 00:00:00 2001
From: Anna Shaleva <shaleva.ann@nspcc.ru>
Date: Thu, 26 Mar 2020 16:34:54 +0300
Subject: [PATCH 1/2] compiler/interop: add missing methods to interop.Iterator

Add Next() and Value() to interop.Iterator and corresponding syscalls to
compiler
---
 pkg/compiler/syscall.go          |  2 ++
 pkg/interop/iterator/iterator.go | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/pkg/compiler/syscall.go b/pkg/compiler/syscall.go
index 62e24f4c9..01234955b 100644
--- a/pkg/compiler/syscall.go
+++ b/pkg/compiler/syscall.go
@@ -86,6 +86,8 @@ var syscalls = map[string]map[string]string{
 		"Create": "Neo.Iterator.Create",
 		"Key":    "Neo.Iterator.Key",
 		"Keys":   "Neo.Iterator.Keys",
+		"Next":   "Neo.Iterator.Next",
+		"Value":  "Neo.Iterator.Value",
 		"Values": "Neo.Iterator.Values",
 	},
 }
diff --git a/pkg/interop/iterator/iterator.go b/pkg/interop/iterator/iterator.go
index 2dd17d2eb..84e85310e 100644
--- a/pkg/interop/iterator/iterator.go
+++ b/pkg/interop/iterator/iterator.go
@@ -22,6 +22,17 @@ func Keys(it Iterator) []interface{} {
 	return nil
 }
 
+// Next advances the iterator, return true if it is was successful
+// and false otherwise.
+func Next(it Iterator) bool {
+	return true
+}
+
+// Value returns the current iterator value.
+func Value(it Iterator) interface{} {
+	return nil
+}
+
 // Values returns the iterator values.
 func Values(it Iterator) []interface{} {
 	return nil

From 0a5298b3ee967b9421c61f0d54c497cf80e77e49 Mon Sep 17 00:00:00 2001
From: Anna Shaleva <shaleva.ann@nspcc.ru>
Date: Wed, 25 Mar 2020 17:40:58 +0300
Subject: [PATCH 2/2] examples: expand storage smartcontract with find() usage
 example

closes #364
---
 examples/storage/storage.go | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/examples/storage/storage.go b/examples/storage/storage.go
index 72450fd36..a117f9f3b 100644
--- a/examples/storage/storage.go
+++ b/examples/storage/storage.go
@@ -1,6 +1,7 @@
 package storagecontract
 
 import (
+	"github.com/nspcc-dev/neo-go/pkg/interop/iterator"
 	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
 )
 
@@ -33,7 +34,20 @@ func Main(operation string, args []interface{}) interface{} {
 		return true
 	}
 
-	// TODO: storage.Find()
+	// Returns an array of key-value pairs with key that matched the passed value
+	if operation == "find" {
+		if checkArgs(args, 1) {
+			value := args[0].([]byte)
+			iter := storage.Find(ctx, value)
+			result := []string{}
+			for iterator.Next(iter) {
+				val := iterator.Value(iter)
+				key := iterator.Key(iter)
+				result = append(result, key.(string)+":"+val.(string))
+			}
+			return result
+		}
+	}
 
 	return false
 }