From b96723f808b0270e125e333f10a702f6602a9138 Mon Sep 17 00:00:00 2001
From: Maxksim Fomenkov <maksim.fomenkov@p2p.org>
Date: Wed, 28 Sep 2022 10:54:23 +0300
Subject: [PATCH] handle no matching upstreams

---
 .../kotlin/io/emeraldpay/dshackle/upstream/FilteredApis.kt   | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/FilteredApis.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/FilteredApis.kt
index 5f72e89b..d7a9a4eb 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/FilteredApis.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/FilteredApis.kt
@@ -17,6 +17,7 @@
 package io.emeraldpay.dshackle.upstream
 
 import io.emeraldpay.dshackle.Global
+import io.emeraldpay.dshackle.SilentException
 import io.emeraldpay.dshackle.config.UpstreamsConfig
 import io.emeraldpay.grpc.Chain
 import io.micrometer.core.instrument.DistributionSummary
@@ -156,6 +157,10 @@ class FilteredApis(
     }
 
     override fun subscribe(subscriber: Subscriber<in Upstream>) {
+        if (allUpstreams.none { matcher.matches(it) }) {
+            Flux.empty<Upstream>().subscribe(subscriber)
+            return
+        }
         // initially try only standard upstreams
         val first = Flux.fromIterable(primaryUpstreams)
         val second = Flux.fromIterable(secondaryUpstreams)