Fix RpcServer[GetStorage] (neo-project#183)

* Fix RpcServer.Blockchain.cs[GetStorage], using id to be key.

* Accept id and hash

Co-authored-by: Shargon <shargon@gmail.com>

src/RpcServer/RpcServer.Blockchain.cs

@@ -167,11 +167,17 @@ private JObject GetRawTransaction(JArray _params)
         [RpcMethod]
         private JObject GetStorage(JArray _params)
         {
-            UInt160 script_hash = UInt160.Parse(_params[0].AsString());
+            if (!int.TryParse(_params[0].AsString(), out int id))
+            {
+                UInt160 script_hash = UInt160.Parse(_params[0].AsString());
+                ContractState contract = Blockchain.Singleton.View.Contracts.TryGet(script_hash);
+                if (contract == null) return null;
+                id = contract.Id;
+            }
             byte[] key = _params[1].AsString().HexToBytes();
             StorageItem item = Blockchain.Singleton.View.Storages.TryGet(new StorageKey
             {
-                ScriptHash = script_hash,
+                Id = id,
                 Key = key
             }) ?? new StorageItem();
             return item.Value?.ToHexString();