multi: add debug logs to catch slow shutdown

chainntnfs/bitcoindnotify/bitcoind.go

@@ -132,7 +132,8 @@ func (b *BitcoindNotifier) Stop() error {
 		return nil
 	}
 
-	chainntnfs.Log.Info("bitcoind notifier shutting down")
+	chainntnfs.Log.Info("bitcoind notifier shutting down...")
+	defer chainntnfs.Log.Debug("bitcoind notifier shutdown complete")
 
 	// Shutdown the rpc client, this gracefully disconnects from bitcoind,
 	// and cleans up all related resources.

chainntnfs/btcdnotify/btcd.go

@@ -169,7 +169,8 @@ func (b *BtcdNotifier) Stop() error {
 		return nil
 	}
 
-	chainntnfs.Log.Info("btcd notifier shutting down")
+	chainntnfs.Log.Info("btcd notifier shutting down...")
+	defer chainntnfs.Log.Debug("btcd notifier shutdown complete")
 
 	// Shutdown the rpc client, this gracefully disconnects from btcd, and
 	// cleans up all related resources.

chainntnfs/mempool.go

@@ -174,6 +174,8 @@ func (m *MempoolNotifier) ProcessRelevantSpendTx(tx *btcutil.Tx) {
 // TearDown stops the notifier and cleans up resources.
 func (m *MempoolNotifier) TearDown() {
 	Log.Infof("Stopping mempool notifier")
+	defer Log.Debug("mempool notifier stopped")
+
 	close(m.quit)
 	m.wg.Wait()
 }

chainntnfs/neutrinonotify/neutrino.go

@@ -136,7 +136,8 @@ func (n *NeutrinoNotifier) Stop() error {
 		return nil
 	}
 
-	chainntnfs.Log.Info("neutrino notifier shutting down")
+	chainntnfs.Log.Info("neutrino notifier shutting down...")
+	defer chainntnfs.Log.Debug("neutrino notifier shutdown complete")
 
 	close(n.quit)
 	n.wg.Wait()