Turn off subs if conn type is rpc (#454)

src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/HeadLivenessValidator.kt

@@ -1,59 +1,14 @@
 package io.emeraldpay.dshackle.upstream.ethereum
 
-import io.emeraldpay.dshackle.ThrottledLogger
-import io.emeraldpay.dshackle.upstream.Head
-import org.slf4j.LoggerFactory
 import reactor.core.publisher.Flux
-import reactor.core.scheduler.Scheduler
-import java.time.Duration
 
-class HeadLivenessValidator(
-    private val head: Head,
-    private val expectedBlockTime: Duration,
-    private val scheduler: Scheduler,
-    private val upstreamId: String,
-) {
-    companion object {
-        const val CHECKED_BLOCKS_UNTIL_LIVE = 3
-        private val log = LoggerFactory.getLogger(HeadLivenessValidator::class.java)
-    }
+interface HeadLivenessValidator {
+    fun getFlux(): Flux<Boolean>
+}
 
-    fun getFlux(): Flux<Boolean> {
-        val headLiveness = head.headLiveness()
-        // first we have moving window of 2 blocks and check that they are consecutive ones
-        val headFlux = head.getFlux().map { it.height }.buffer(2, 1).map {
-            it.last() - it.first() == 1L
-        }.scan(Pair(0, true)) { acc, value ->
-            // then we accumulate consecutive true events, false resets counter
-            if (value) {
-                Pair(acc.first + 1, true)
-            } else {
-                if (log.isDebugEnabled) {
-                    log.debug("non consecutive blocks in head for $upstreamId")
-                } else {
-                    ThrottledLogger.log(log, "non consecutive blocks in head for $upstreamId")
-                }
-                Pair(0, false)
-            }
-        }.flatMap { (count, value) ->
-            // we emit when we have false or checked CHECKED_BLOCKS_UNTIL_LIVE blocks
-            // CHECKED_BLOCKS_UNTIL_LIVE blocks == (CHECKED_BLOCKS_UNTIL_LIVE - 1) consecutive true
-            when {
-                count >= (CHECKED_BLOCKS_UNTIL_LIVE - 1) -> Flux.just(true)
-                !value -> Flux.just(false)
-                else -> Flux.empty()
-            }
-        }.timeout(
-            expectedBlockTime.multipliedBy(CHECKED_BLOCKS_UNTIL_LIVE.toLong() * 2),
-            Flux.just(false).doOnNext {
-                if (log.isDebugEnabled) {
-                    log.debug("head liveness check broken with timeout in $upstreamId")
-                } else {
-                    ThrottledLogger.log(log, "head liveness check broken with timeout in $upstreamId")
-                }
-            },
-        ).repeat().subscribeOn(scheduler)
+class NoHeadLivenessValidator : HeadLivenessValidator {
 
-        return Flux.merge(headFlux, headLiveness)
+    override fun getFlux(): Flux<Boolean> {
+        return Flux.just(false)
     }
 }

src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/HeadLivenessValidatorImpl.kt

@@ -0,0 +1,59 @@
+package io.emeraldpay.dshackle.upstream.ethereum
+
+import io.emeraldpay.dshackle.ThrottledLogger
+import io.emeraldpay.dshackle.upstream.Head
+import org.slf4j.LoggerFactory
+import reactor.core.publisher.Flux
+import reactor.core.scheduler.Scheduler
+import java.time.Duration
+
+class HeadLivenessValidatorImpl(
+    private val head: Head,
+    private val expectedBlockTime: Duration,
+    private val scheduler: Scheduler,
+    private val upstreamId: String,
+) : HeadLivenessValidator {
+    companion object {
+        const val CHECKED_BLOCKS_UNTIL_LIVE = 3
+        private val log = LoggerFactory.getLogger(HeadLivenessValidatorImpl::class.java)
+    }
+
+    override fun getFlux(): Flux<Boolean> {
+        val headLiveness = head.headLiveness()
+        // first we have moving window of 2 blocks and check that they are consecutive ones
+        val headFlux = head.getFlux().map { it.height }.buffer(2, 1).map {
+            it.last() - it.first() == 1L
+        }.scan(Pair(0, true)) { acc, value ->
+            // then we accumulate consecutive true events, false resets counter
+            if (value) {
+                Pair(acc.first + 1, true)
+            } else {
+                if (log.isDebugEnabled) {
+                    log.debug("non consecutive blocks in head for $upstreamId")
+                } else {
+                    ThrottledLogger.log(log, "non consecutive blocks in head for $upstreamId")
+                }
+                Pair(0, false)
+            }
+        }.flatMap { (count, value) ->
+            // we emit when we have false or checked CHECKED_BLOCKS_UNTIL_LIVE blocks
+            // CHECKED_BLOCKS_UNTIL_LIVE blocks == (CHECKED_BLOCKS_UNTIL_LIVE - 1) consecutive true
+            when {
+                count >= (CHECKED_BLOCKS_UNTIL_LIVE - 1) -> Flux.just(true)
+                !value -> Flux.just(false)
+                else -> Flux.empty()
+            }
+        }.timeout(
+            expectedBlockTime.multipliedBy(CHECKED_BLOCKS_UNTIL_LIVE.toLong() * 2),
+            Flux.just(false).doOnNext {
+                if (log.isDebugEnabled) {
+                    log.debug("head liveness check broken with timeout in $upstreamId")
+                } else {
+                    ThrottledLogger.log(log, "head liveness check broken with timeout in $upstreamId")
+                }
+            },
+        ).repeat().subscribeOn(scheduler)
+
+        return Flux.merge(headFlux, headLiveness)
+    }
+}

src/main/kotlin/io/emeraldpay/dshackle/upstream/generic/connectors/GenericRpcConnector.kt

@@ -13,6 +13,8 @@ import io.emeraldpay.dshackle.upstream.MergedHead
 import io.emeraldpay.dshackle.upstream.NoIngressSubscription
 import io.emeraldpay.dshackle.upstream.ethereum.GenericWsHead
 import io.emeraldpay.dshackle.upstream.ethereum.HeadLivenessValidator
+import io.emeraldpay.dshackle.upstream.ethereum.HeadLivenessValidatorImpl
+import io.emeraldpay.dshackle.upstream.ethereum.NoHeadLivenessValidator
 import io.emeraldpay.dshackle.upstream.ethereum.WsConnectionPool
 import io.emeraldpay.dshackle.upstream.ethereum.WsConnectionPoolFactory
 import io.emeraldpay.dshackle.upstream.ethereum.WsSubscriptions
@@ -123,7 +125,11 @@ class GenericRpcConnector(
                 )
             }
         }
-        liveness = HeadLivenessValidator(head, expectedBlockTime, headLivenessScheduler, id)
+
+        liveness = when (connectorType) {
+            RPC_ONLY -> NoHeadLivenessValidator()
+            RPC_REQUESTS_WITH_MIXED_HEAD, RPC_REQUESTS_WITH_WS_HEAD, WS_ONLY -> HeadLivenessValidatorImpl(head, expectedBlockTime, headLivenessScheduler, id)
+        }
     }
 
     override fun setCaches(caches: Caches) {

src/main/kotlin/io/emeraldpay/dshackle/upstream/generic/connectors/GenericWsConnector.kt

@@ -6,7 +6,7 @@ import io.emeraldpay.dshackle.upstream.DefaultUpstream
 import io.emeraldpay.dshackle.upstream.Head
 import io.emeraldpay.dshackle.upstream.IngressSubscription
 import io.emeraldpay.dshackle.upstream.ethereum.GenericWsHead
-import io.emeraldpay.dshackle.upstream.ethereum.HeadLivenessValidator
+import io.emeraldpay.dshackle.upstream.ethereum.HeadLivenessValidatorImpl
 import io.emeraldpay.dshackle.upstream.ethereum.WsConnectionPool
 import io.emeraldpay.dshackle.upstream.ethereum.WsConnectionPoolFactory
 import io.emeraldpay.dshackle.upstream.ethereum.WsSubscriptionsImpl
@@ -32,7 +32,7 @@ class GenericWsConnector(
     private val reader: ChainReader
     private val head: GenericWsHead
     private val subscriptions: IngressSubscription
-    private val liveness: HeadLivenessValidator
+    private val liveness: HeadLivenessValidatorImpl
     init {
         pool = wsFactory.create(upstream)
         reader = JsonRpcWsClient(pool)
@@ -48,7 +48,7 @@ class GenericWsConnector(
             chainSpecific,
             expectedBlockTime,
         )
-        liveness = HeadLivenessValidator(head, expectedBlockTime, headLivenessScheduler, upstream.getId())
+        liveness = HeadLivenessValidatorImpl(head, expectedBlockTime, headLivenessScheduler, upstream.getId())
         subscriptions = chainSpecific.makeIngressSubscription(wsSubscriptions)
     }