[#42] Share GetList function between contracts

Replace getList function to common package and export it. Reuse the function
in Container and Reputation contracts.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

common/storage.go

@@ -0,0 +1,21 @@
+package common
+
+import (
+	"github.com/nspcc-dev/neo-go/pkg/interop/binary"
+	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
+)
+
+func GetList(ctx storage.Context, key interface{}) [][]byte {
+	data := storage.Get(ctx, key)
+	if data != nil {
+		return binary.Deserialize(data.([]byte)).([][]byte)
+	}
+
+	return [][]byte{}
+}
+
+// SetSerialized serializes data and puts it into contract storage.
+func SetSerialized(ctx storage.Context, key interface{}, value interface{}) {
+	data := binary.Serialize(value)
+	storage.Put(ctx, key, data)
+}

common/vote.go

@@ -96,9 +96,3 @@ func getBallots(ctx storage.Context) []Ballot {
 func BytesEqual(a []byte, b []byte) bool {
 	return util.Equals(string(a), string(b))
 }
-
-// SetSerialized serializes data and puts it into contract storage.
-func SetSerialized(ctx storage.Context, key interface{}, value interface{}) {
-	data := binary.Serialize(value)
-	storage.Put(ctx, key, data)
-}

container/container_contract.go

@@ -203,14 +203,14 @@ func List(owner []byte) [][]byte {
 
 	var list [][]byte
 
-	owners := getList(ctx, ownersKey)
+	owners := common.GetList(ctx, ownersKey)
 	for i := 0; i < len(owners); i++ {
 		ownerID := owners[i]
 		if len(owner) != 0 && !common.BytesEqual(owner, ownerID) {
 			continue
 		}
 
-		containers := getList(ctx, ownerID)
+		containers := common.GetList(ctx, ownerID)
 
 		for j := 0; j < len(containers); j++ {
 			container := containers[j]
@@ -429,7 +429,7 @@ func removeContainer(ctx storage.Context, id []byte, owner []byte) {
 }
 
 func addOrAppend(ctx storage.Context, key interface{}, value []byte) {
-	list := getList(ctx, key)
+	list := common.GetList(ctx, key)
 	for i := 0; i < len(list); i++ {
 		if common.BytesEqual(list[i], value) {
 			return
@@ -448,7 +448,7 @@ func addOrAppend(ctx storage.Context, key interface{}, value []byte) {
 // remove returns amount of left elements in the list
 func remove(ctx storage.Context, key interface{}, value []byte) int {
 	var (
-		list    = getList(ctx, key)
+		list    = common.GetList(ctx, key)
 		newList = [][]byte{}
 	)
 
@@ -468,15 +468,6 @@ func remove(ctx storage.Context, key interface{}, value []byte) int {
 	return ln
 }
 
-func getList(ctx storage.Context, key interface{}) [][]byte {
-	data := storage.Get(ctx, key)
-	if data != nil {
-		return binary.Deserialize(data.([]byte)).([][]byte)
-	}
-
-	return [][]byte{}
-}
-
 func getAllContainers(ctx storage.Context) [][]byte {
 	var list [][]byte
 
@@ -517,10 +508,10 @@ func verifySignature(msg, sig []byte, keys [][]byte) bool {
 }
 
 func getOwnerByID(ctx storage.Context, id []byte) []byte {
-	owners := getList(ctx, ownersKey)
+	owners := common.GetList(ctx, ownersKey)
 	for i := 0; i < len(owners); i++ {
 		ownerID := owners[i]
-		containers := getList(ctx, ownerID)
+		containers := common.GetList(ctx, ownerID)
 
 		for j := 0; j < len(containers); j++ {
 			container := containers[j]

reputation/reputation_contract.go

@@ -1,7 +1,6 @@
 package reputationcontract
 
 import (
-	"github.com/nspcc-dev/neo-go/pkg/interop/binary"
 	"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
 	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
 	"github.com/nspcc-dev/neofs-contract/common"
@@ -53,7 +52,7 @@ func Put(manager, epoch, typ []byte, newTrustList [][]byte) bool {
 	//       contract storage will be used as a cache if needed
 	key := append(trustJournalPrefix, append(epoch, typ...)...)
 
-	trustList := getList(ctx, key)
+	trustList := common.GetList(ctx, key)
 
 	// fixme: with neo3.0 it is kinda unnecessary
 	if len(trustList) == 0 {
@@ -75,14 +74,5 @@ func Put(manager, epoch, typ []byte, newTrustList [][]byte) bool {
 func List(epoch, typ []byte) [][]byte {
 	key := append(trustJournalPrefix, append(epoch, typ...)...)
 
-	return getList(ctx, key)
+	return common.GetList(ctx, key)
-}
-
-func getList(ctx storage.Context, key interface{}) [][]byte {
-	data := storage.Get(ctx, key)
-	if data != nil {
-		return binary.Deserialize(data.([]byte)).([][]byte)
-	}
-
-	return [][]byte{}
 }