problem: gives no status updates if chain is not configured

src/main/kotlin/io/emeraldpay/dshackle/rpc/Describe.kt

@@ -35,7 +35,7 @@ class Describe(
             val resp = BlockchainOuterClass.DescribeResponse.newBuilder()
             multistreamHolder.getAvailable().forEach { chain ->
                 multistreamHolder.getUpstream(chain)?.let { chainUpstreams ->
-                    val status = subscribeStatus.chainStatus(chain, chainUpstreams.getAll())
+                    val status = subscribeStatus.chainStatus(chain, chainUpstreams.getStatus(), chainUpstreams)
                     val targets = chainUpstreams.getMethods().getSupportedMethods()
                     val capabilities: MutableSet<Capability> = mutableSetOf()
                     val chainDescription = BlockchainOuterClass.DescribeChain.newBuilder()

src/main/kotlin/io/emeraldpay/dshackle/rpc/SubscribeStatus.kt

@@ -31,28 +31,41 @@ class SubscribeStatus(
 ) {
 
     fun subscribeStatus(requestMono: Mono<BlockchainOuterClass.StatusRequest>): Flux<BlockchainOuterClass.ChainStatus> {
-        return requestMono.flatMapMany {
-            val ups = multistreamHolder.getAvailable().mapNotNull { chain ->
-                val chainUpstream = multistreamHolder.getUpstream(chain)
-                chainUpstream?.observeStatus()?.map { avail ->
-                    ChainSubscription(chain, chainUpstream, avail)
+        return requestMono.flatMapMany { req ->
+            // check status for all requested chains
+            val all = req.chainsList.map {
+                val chain = Chain.byId(it.number)
+                val up = multistreamHolder.getUpstream(chain)
+                if (up == null) {
+                    // when the chain is not configured return just UNAVAILABLE
+                    Mono.just(chainUnavailable(chain)).flux()
+                } else {
+                    // when configured subscribe to its updates
+                    up.observeStatus().map { availability ->
+                        chainStatus(chain, availability, up)
+                    }
                 }
             }
-
-            Flux.merge(ups)
-                    .map {
-                        chainStatus(it.chain, it.up.getAll())
-                    }
+            Flux.merge(all)
         }
     }
 
-    fun chainStatus(chain: Chain, ups: List<Upstream>): BlockchainOuterClass.ChainStatus {
-        val available = ups.map { u ->
-            u.getStatus()
-        }.min() ?: UpstreamAvailability.UNAVAILABLE
-        val quorum = ups.filter {
-            it.getStatus() > UpstreamAvailability.UNAVAILABLE
-        }.count()
+    fun chainUnavailable(chain: Chain): BlockchainOuterClass.ChainStatus {
+        return BlockchainOuterClass.ChainStatus.newBuilder()
+                .setAvailability(BlockchainOuterClass.AvailabilityEnum.AVAIL_UNAVAILABLE)
+                .setChain(Common.ChainRef.forNumber(chain.id))
+                .setQuorum(0)
+                .build()
+    }
+
+    fun chainStatus(chain: Chain, available: UpstreamAvailability, ups: Multistream): BlockchainOuterClass.ChainStatus {
+        val quorum = if (available != UpstreamAvailability.UNAVAILABLE) {
+            ups.getAll().count {
+                it.getStatus() > UpstreamAvailability.UNAVAILABLE
+            }
+        } else {
+            0
+        }
         return BlockchainOuterClass.ChainStatus.newBuilder()
                 .setAvailability(BlockchainOuterClass.AvailabilityEnum.forNumber(available.grpcId))
                 .setChain(Common.ChainRef.forNumber(chain.id))

src/main/kotlin/io/emeraldpay/dshackle/upstream/Multistream.kt

@@ -98,7 +98,7 @@ abstract class Multistream(
     /**
      * Get list of all underlying upstreams
      */
-    fun getAll(): List<Upstream> {
+    open fun getAll(): List<Upstream> {
         return upstreams
     }
 

src/test/groovy/io/emeraldpay/dshackle/rpc/SubscribeStatusSpec.groovy

@@ -0,0 +1,60 @@
+package io.emeraldpay.dshackle.rpc
+
+import io.emeraldpay.api.proto.BlockchainOuterClass
+import io.emeraldpay.api.proto.Common
+import io.emeraldpay.dshackle.upstream.Multistream
+import io.emeraldpay.dshackle.upstream.MultistreamHolder
+import io.emeraldpay.dshackle.upstream.Upstream
+import io.emeraldpay.dshackle.upstream.UpstreamAvailability
+import io.emeraldpay.grpc.Chain
+import reactor.core.publisher.Mono
+import reactor.test.StepVerifier
+import spock.lang.Specification
+
+import java.time.Duration
+
+class SubscribeStatusSpec extends Specification {
+
+    def "gives UNAVAIL if non-configured chain is requested"() {
+        setup:
+        def ethereumUp = Mock(Upstream) {
+            _ * getStatus() >> UpstreamAvailability.OK
+        }
+        def ethereumUpAll = Mock(Multistream) {
+            _ * it.observeStatus() >> Mono.just(UpstreamAvailability.OK).repeat()
+                    .delayElements(Duration.ofMillis(100))
+            _ * it.getAll() >> [ethereumUp]
+        }
+        def ups = Mock(MultistreamHolder) {
+            _ * it.getAvailable() >> [Chain.ETHEREUM]
+            1 * it.getUpstream(Chain.ETHEREUM) >> ethereumUpAll
+            1 * it.getUpstream(Chain.BITCOIN) >> null
+        }
+        def ctrl = new SubscribeStatus(ups)
+
+        when:
+        def req = BlockchainOuterClass.StatusRequest.newBuilder()
+                .addChains(Common.ChainRef.CHAIN_ETHEREUM)
+                .addChains(Common.ChainRef.CHAIN_BITCOIN)
+                .build()
+        def act = ctrl.subscribeStatus(Mono.just(req))
+                .take(2)
+        // sort just for testing
+                .sort(new Comparator<BlockchainOuterClass.ChainStatus>() {
+                    @Override
+                    int compare(BlockchainOuterClass.ChainStatus o1, BlockchainOuterClass.ChainStatus o2) {
+                        return o1.chainValue <=> o2.chainValue
+                    }
+                })
+        then:
+        StepVerifier.create(act)
+                .expectNextMatches {
+                    it.chainValue == Chain.BITCOIN.id && it.availability == BlockchainOuterClass.AvailabilityEnum.AVAIL_UNAVAILABLE
+                }
+                .expectNextMatches {
+                    it.chainValue == Chain.ETHEREUM.id && it.availability == BlockchainOuterClass.AvailabilityEnum.AVAIL_OK
+                }
+                .expectComplete()
+                .verify(Duration.ofSeconds(3))
+    }
+}