From 21ccb1a02a65c458df093d51fa91de5fb13cf4d5 Mon Sep 17 00:00:00 2001
From: Anna Shaleva <shaleva.ann@nspcc.ru>
Date: Fri, 8 Dec 2023 21:56:09 +0300
Subject: [PATCH] rpcclient: check network initialisation for blocks
 subscriptions

StateRootInHeader depends on it, so we better immediately return error
if client is not initialised.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
---
 pkg/rpcclient/wsclient.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkg/rpcclient/wsclient.go b/pkg/rpcclient/wsclient.go
index b9e03f0f2..044214a73 100644
--- a/pkg/rpcclient/wsclient.go
+++ b/pkg/rpcclient/wsclient.go
@@ -732,6 +732,9 @@ func (c *WSClient) ReceiveBlocks(flt *neorpc.BlockFilter, rcvr chan<- *block.Blo
 	if rcvr == nil {
 		return "", ErrNilNotificationReceiver
 	}
+	if !c.cache.initDone {
+		return "", errNetworkNotInitialized
+	}
 	params := []any{"block_added"}
 	if flt != nil {
 		flt = flt.Copy()