From a1894d8e381985e1ba37032d09b01044aef50364 Mon Sep 17 00:00:00 2001
From: Alexandru Vasile <alexandru.vasile@parity.io>
Date: Mon, 15 Jan 2024 13:33:58 +0200
Subject: [PATCH] backend: Add loop iteration debug and panic

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
---
 subxt/src/backend/unstable/mod.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/subxt/src/backend/unstable/mod.rs b/subxt/src/backend/unstable/mod.rs
index fb1437352d..7a3a380dbd 100644
--- a/subxt/src/backend/unstable/mod.rs
+++ b/subxt/src/backend/unstable/mod.rs
@@ -474,9 +474,17 @@ impl<T: Config + Send + Sync + 'static> Backend<T> for UnstableBackend<T> {
         // with chainHead_follow.
         let mut finalized_hash: Option<T::Hash> = None;
 
+        let mut iter_num = 0;
+        let now = std::time::Instant::now();
+
         // Now we can attempt to associate tx events with pinned blocks.
         let tx_stream = futures::stream::poll_fn(move |cx| {
             loop {
+                iter_num += 1;
+                if now.elapsed().as_secs() > 120 {
+                    panic!("iter={:#?}", iter_num);
+                }
+
                 // Bail early if no more tx events; we don't want to keep polling for pinned blocks.
                 if done {
                     return Poll::Ready(None);