solution: kotlin code conventions

.gitignore

@@ -1,7 +1,11 @@
 .gradle/
 build/
 out/
-*.iml
 ./dshackle.yaml
 ./upstream.yaml
-testsetup/
+testsetup/
+.idea/
+.idea_modules/
+*.iml
+*.ipr
+*.iws

build.gradle

@@ -27,6 +27,7 @@ plugins {
     id 'io.spring.dependency-management' version '1.0.6.RELEASE'
     id 'com.palantir.git-version' version '0.12.2'
     id "com.google.protobuf" version "0.8.12"
+    id "org.jlleitschuh.gradle.ktlint" version "10.2.0"
 }
 
 

gradle.properties

@@ -1,3 +1,5 @@
+kotlin.code.style=official
+
 # Languages
 groovyVersion=2.5.14
 kotlinVersion=1.5.30

src/main/kotlin/io/emeraldpay/dshackle/ChainValue.kt

@@ -17,7 +17,7 @@ package io.emeraldpay.dshackle
 
 import io.emeraldpay.api.proto.Common
 import io.emeraldpay.grpc.Chain
-import java.util.*
+import java.util.EnumMap
 import java.util.concurrent.locks.ReentrantLock
 import kotlin.concurrent.withLock
 
@@ -25,7 +25,7 @@ import kotlin.concurrent.withLock
  * Keeps a lazily created value associated with a Chain
  */
 class ChainValue<V>(
-        private val factory: (chain: Chain) -> V
+    private val factory: (chain: Chain) -> V
 ) {
 
     private val values = EnumMap<Chain, V>(Chain::class.java)
@@ -52,4 +52,4 @@ class ChainValue<V>(
             }
         }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/Config.kt

@@ -16,26 +16,26 @@
  */
 package io.emeraldpay.dshackle
 
-import com.fasterxml.jackson.core.Version
-import com.fasterxml.jackson.databind.DeserializationFeature
-import com.fasterxml.jackson.databind.ObjectMapper
-import com.fasterxml.jackson.databind.module.SimpleModule
-import io.emeraldpay.dshackle.config.*
+import io.emeraldpay.dshackle.config.CacheConfig
+import io.emeraldpay.dshackle.config.MainConfig
+import io.emeraldpay.dshackle.config.MainConfigReader
+import io.emeraldpay.dshackle.config.MonitoringConfig
+import io.emeraldpay.dshackle.config.TokensConfig
+import io.emeraldpay.dshackle.config.UpstreamsConfig
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.beans.factory.annotation.Qualifier
 import org.springframework.boot.ExitCodeGenerator
 import org.springframework.boot.SpringApplication
 import org.springframework.context.ApplicationContext
-import org.springframework.context.annotation.*
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
 import org.springframework.core.env.Environment
 import org.springframework.scheduling.annotation.EnableAsync
 import org.springframework.scheduling.annotation.EnableScheduling
 import reactor.core.scheduler.Scheduler
 import reactor.core.scheduler.Schedulers
 import java.io.File
-import java.text.SimpleDateFormat
-import java.util.*
 import java.util.concurrent.Executors
 import kotlin.system.exitProcess
 
@@ -43,8 +43,8 @@ import kotlin.system.exitProcess
 @EnableScheduling
 @EnableAsync
 open class Config(
-        @Autowired private val env: Environment,
-        @Autowired private val ctx: ApplicationContext
+    @Autowired private val env: Environment,
+    @Autowired private val ctx: ApplicationContext
 ) {
 
     companion object {
@@ -68,14 +68,15 @@ open class Config(
         if (!FileResolver.isAccessible(target)) {
             target = File(LOCAL_CONFIG)
             if (!FileResolver.isAccessible(target)) {
-                throw IllegalStateException("Configuration is not found neither at ${DEFAULT_CONFIG} nor ${LOCAL_CONFIG}")
+                throw IllegalStateException("Configuration is not found neither at $DEFAULT_CONFIG nor $LOCAL_CONFIG")
             }
         }
         target = target.normalize()
         return target
     }
 
-    @Bean @Qualifier("upstreamScheduler")
+    @Bean
+    @Qualifier("upstreamScheduler")
     open fun upstreamScheduler(): Scheduler {
         return Schedulers.fromExecutorService(Executors.newFixedThreadPool(16))
     }
@@ -91,7 +92,7 @@ open class Config(
         }
         val reader = MainConfigReader(fileResolver)
         return reader.read(f.inputStream())
-                ?: throw IllegalStateException("Config is not available at ${f.absolutePath}")
+            ?: throw IllegalStateException("Config is not available at ${f.absolutePath}")
     }
 
     @Bean
@@ -119,5 +120,4 @@ open class Config(
     open fun monitoringConfig(@Autowired mainConfig: MainConfig): MonitoringConfig {
         return mainConfig.monitoring
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/Defaults.kt

@@ -25,4 +25,4 @@ class Defaults {
         val timeoutInternal: Duration = timeout.dividedBy(4)
         val retryConnection: Duration = Duration.ofSeconds(10)
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/FileResolver.kt

@@ -19,7 +19,7 @@ package io.emeraldpay.dshackle
 import java.io.File
 
 open class FileResolver(
-        private val baseDir: File
+    private val baseDir: File
 ) {
 
     companion object {
@@ -35,5 +35,4 @@ open class FileResolver(
         }
         return File(baseDir, path)
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/Global.kt

@@ -28,7 +28,7 @@ import io.emeraldpay.dshackle.upstream.bitcoin.data.RpcUnspentDeserializer
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcRequest
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcResponse
 import java.text.SimpleDateFormat
-import java.util.*
+import java.util.TimeZone
 import java.util.concurrent.Executors
 import java.util.concurrent.ScheduledExecutorService
 
@@ -57,12 +57,10 @@ class Global {
             objectMapper.registerModule(JavaTimeModule())
             objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
             objectMapper
-                    .setDateFormat(SimpleDateFormat("yyyy-MM-dd\'T\'HH:mm:ss.SSS"))
-                    .setTimeZone(TimeZone.getTimeZone("UTC"))
+                .setDateFormat(SimpleDateFormat("yyyy-MM-dd\'T\'HH:mm:ss.SSS"))
+                .setTimeZone(TimeZone.getTimeZone("UTC"))
 
             return objectMapper
         }
-
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/GrpcServer.kt

@@ -18,7 +18,7 @@ package io.emeraldpay.dshackle
 
 import io.emeraldpay.dshackle.config.MainConfig
 import io.emeraldpay.dshackle.monitoring.accesslog.AccessHandlerGrpc
-import io.grpc.*
+import io.grpc.Server
 import io.grpc.netty.NettyServerBuilder
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
@@ -29,15 +29,15 @@ import javax.annotation.PreDestroy
 
 @Service
 open class GrpcServer(
-        @Autowired val rpcs: List<io.grpc.BindableService>,
-        @Autowired val mainConfig: MainConfig,
-        @Autowired val tlsSetup: TlsSetup,
-        @Autowired val accessHandler: AccessHandlerGrpc
+    @Autowired val rpcs: List<io.grpc.BindableService>,
+    @Autowired val mainConfig: MainConfig,
+    @Autowired val tlsSetup: TlsSetup,
+    @Autowired val accessHandler: AccessHandlerGrpc
 ) {
 
     private val log = LoggerFactory.getLogger(GrpcServer::class.java)
 
-    private var server: Server? = null;
+    private var server: Server? = null
 
     @PostConstruct
     fun start() {
@@ -45,14 +45,14 @@ open class GrpcServer(
         log.debug("Running with DEBUG LOGGING")
         log.info("Listening Native gRPC on ${mainConfig.host}:${mainConfig.port}")
         val serverBuilder = NettyServerBuilder
-                .forAddress(InetSocketAddress(mainConfig.host, mainConfig.port))
-                .let {
-                    if (mainConfig.accessLogConfig.enabled) {
-                        it.intercept(accessHandler)
-                    } else {
-                        it
-                    }
+            .forAddress(InetSocketAddress(mainConfig.host, mainConfig.port))
+            .let {
+                if (mainConfig.accessLogConfig.enabled) {
+                    it.intercept(accessHandler)
+                } else {
+                    it
                 }
+            }
 
         tlsSetup.setupServer("Native gRPC", mainConfig.tls, true)?.let {
             serverBuilder.sslContext(it)
@@ -75,5 +75,4 @@ open class GrpcServer(
         server?.shutdownNow()
         log.info("GRPC Server shot down")
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/ProxyStarter.kt

@@ -17,7 +17,6 @@
 package io.emeraldpay.dshackle
 
 import io.emeraldpay.dshackle.config.MainConfig
-import io.emeraldpay.dshackle.config.ProxyConfig
 import io.emeraldpay.dshackle.monitoring.MonitoringSetup
 import io.emeraldpay.dshackle.monitoring.accesslog.AccessHandlerHttp
 import io.emeraldpay.dshackle.proxy.ProxyServer
@@ -26,8 +25,6 @@ import io.emeraldpay.dshackle.proxy.WriteRpcJson
 import io.emeraldpay.dshackle.rpc.NativeCall
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.context.annotation.DependsOn
-import org.springframework.core.env.Environment
 import org.springframework.stereotype.Service
 import javax.annotation.PostConstruct
 
@@ -36,14 +33,14 @@ import javax.annotation.PostConstruct
  */
 @Service
 class ProxyStarter(
-        @Autowired private val mainConfig: MainConfig,
-        @Autowired private val readRpcJson: ReadRpcJson,
-        @Autowired private val writeRpcJson: WriteRpcJson,
-        @Autowired private val nativeCall: NativeCall,
-        @Autowired private val tlsSetup: TlsSetup,
-        @Autowired private val accessHandlerHttp: AccessHandlerHttp,
-        // depend on Monitoring, declared here just to ensure it's properly initialized before the Proxy
-        @Autowired private val monitoringSetup: MonitoringSetup
+    @Autowired private val mainConfig: MainConfig,
+    @Autowired private val readRpcJson: ReadRpcJson,
+    @Autowired private val writeRpcJson: WriteRpcJson,
+    @Autowired private val nativeCall: NativeCall,
+    @Autowired private val tlsSetup: TlsSetup,
+    @Autowired private val accessHandlerHttp: AccessHandlerHttp,
+    // depend on Monitoring, declared here just to ensure it's properly initialized before the Proxy
+    @Autowired private val monitoringSetup: MonitoringSetup
 ) {
 
     companion object {
@@ -60,5 +57,4 @@ class ProxyStarter(
         val server = ProxyServer(config, readRpcJson, writeRpcJson, nativeCall, tlsSetup, accessHandlerHttp.factory)
         server.start()
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/SilentException.kt

@@ -22,7 +22,6 @@ import io.emeraldpay.grpc.Chain
  */
 open class SilentException(message: String) : Exception(message) {
 
-
     /**
      * Blockchain is not available or not supported by current instance of the Dshackle
      */
@@ -31,4 +30,4 @@ open class SilentException(message: String) : Exception(message) {
     }
 
     class DataUnavailable(val code: String) : SilentException("Data is unavailable: $code")
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/Starter.kt

@@ -24,7 +24,7 @@ import org.springframework.context.annotation.Import
 import org.springframework.core.io.ClassPathResource
 import org.springframework.core.io.support.ResourcePropertySource
 
-@SpringBootApplication(scanBasePackages = [ "io.emeraldpay.dshackle" ])
+@SpringBootApplication(scanBasePackages = ["io.emeraldpay.dshackle"])
 @Import(Config::class)
 open class Starter
 
@@ -35,4 +35,4 @@ fun main(args: Array<String>) {
     app.setDefaultProperties(ResourcePropertySource("version.properties").source)
     app.setBanner(ResourceBanner(ClassPathResource("banner.txt")))
     app.run(*args)
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/TlsSetup.kt

@@ -29,7 +29,7 @@ import org.springframework.stereotype.Service
 
 @Service
 open class TlsSetup(
-        @Autowired val fileResolver: FileResolver
+    @Autowired val fileResolver: FileResolver
 ) {
 
     companion object {
@@ -68,19 +68,19 @@ open class TlsSetup(
 
             val sslContextBuilder = if (grpc) {
                 GrpcSslContexts.forServer(
-                        fileResolver.resolve(config.certificate!!),
-                        fileResolver.resolve(config.key!!)
+                    fileResolver.resolve(config.certificate!!),
+                    fileResolver.resolve(config.key!!)
                 )
             } else {
                 SslContextBuilder.forServer(
-                        fileResolver.resolve(config.certificate!!),
-                        fileResolver.resolve(config.key!!)
+                    fileResolver.resolve(config.certificate!!),
+                    fileResolver.resolve(config.key!!)
                 )
             }
             if (StringUtils.isNotEmpty(config.clientCa)) {
                 log.info("Using TLS for client authentication for $category")
                 sslContextBuilder.trustManager(
-                        fileResolver.resolve(config.clientCa!!)
+                    fileResolver.resolve(config.clientCa!!)
                 )
                 if (config.clientRequire != null && config.clientRequire!!) {
                     sslContextBuilder.clientAuth(ClientAuth.REQUIRE)
@@ -96,5 +96,4 @@ open class TlsSetup(
         }
         return null
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/BlockByHeight.kt

@@ -25,8 +25,8 @@ import reactor.core.publisher.Mono
  * Connects two caches to read through them. First is cache height->hash, second is hash->block.
  */
 open class BlockByHeight(
-        private val heights: Reader<Long, BlockId>,
-        private val blocks: Reader<BlockId, BlockContainer>
+    private val heights: Reader<Long, BlockId>,
+    private val blocks: Reader<BlockId, BlockContainer>
 ) : Reader<Long, BlockContainer> {
 
     companion object {
@@ -35,7 +35,6 @@ open class BlockByHeight(
 
     override fun read(key: Long): Mono<BlockContainer> {
         return heights.read(key)
-                .flatMap { blocks.read(it) }
+            .flatMap { blocks.read(it) }
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/BlocksMemCache.kt

@@ -23,12 +23,12 @@ import io.emeraldpay.dshackle.reader.Reader
 import reactor.core.publisher.Mono
 
 open class BlocksMemCache(
-        maxSize: Int = 64
+    maxSize: Int = 64
 ) : Reader<BlockId, BlockContainer> {
 
     private val mapping = Caffeine.newBuilder()
-            .maximumSize(maxSize.toLong())
-            .build<BlockId, BlockContainer>()
+        .maximumSize(maxSize.toLong())
+        .build<BlockId, BlockContainer>()
 
     override fun read(key: BlockId): Mono<BlockContainer> {
         return Mono.justOrEmpty(get(key))
@@ -45,4 +45,4 @@ open class BlocksMemCache(
     open fun purge() {
         mapping.cleanUp()
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/BlocksRedisCache.kt

@@ -32,10 +32,10 @@ import java.time.Instant
  * Cache blocks in Redis database
  */
 class BlocksRedisCache(
-        redis: RedisReactiveCommands<String, ByteArray>,
-        chain: Chain
+    redis: RedisReactiveCommands<String, ByteArray>,
+    chain: Chain
 ) : Reader<BlockId, BlockContainer>,
-        OnBlockRedisCache<BlockContainer>(redis, chain, CachesProto.ValueContainer.ValueType.BLOCK) {
+    OnBlockRedisCache<BlockContainer>(redis, chain, CachesProto.ValueContainer.ValueType.BLOCK) {
 
     companion object {
         private val log = LoggerFactory.getLogger(BlocksRedisCache::class.java)
@@ -59,21 +59,21 @@ class BlocksRedisCache(
         }
         val meta = value.blockMeta
         return BlockContainer(
-                meta.height,
-                BlockId(meta.hash.toByteArray()),
-                BigInteger(meta.difficulty.toByteArray()),
-                Instant.ofEpochMilli(meta.timestamp),
-                false,
-                value.value.toByteArray(),
-                null,
-                meta.txHashesList.map {
-                    TxId(it.toByteArray())
-                }
+            meta.height,
+            BlockId(meta.hash.toByteArray()),
+            BigInteger(meta.difficulty.toByteArray()),
+            Instant.ofEpochMilli(meta.timestamp),
+            false,
+            value.value.toByteArray(),
+            null,
+            meta.txHashesList.map {
+                TxId(it.toByteArray())
+            }
         )
     }
 
     fun add(block: BlockContainer): Mono<Void> {
-        if (block.timestamp == null || block.hash == null) { //null in unit tests
+        if (block.timestamp == null || block.hash == null) { // null in unit tests
             return Mono.empty()
         }
         if (block.full) {
@@ -81,5 +81,4 @@ class BlocksRedisCache(
         }
         return super.add(block, block)
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/Caches.kt

@@ -16,9 +16,12 @@
 package io.emeraldpay.dshackle.cache
 
 import io.emeraldpay.dshackle.Global
-import io.emeraldpay.dshackle.data.*
+import io.emeraldpay.dshackle.data.BlockContainer
+import io.emeraldpay.dshackle.data.BlockId
+import io.emeraldpay.dshackle.data.DefaultContainer
+import io.emeraldpay.dshackle.data.TxContainer
+import io.emeraldpay.dshackle.data.TxId
 import io.emeraldpay.dshackle.reader.CompoundReader
-import io.emeraldpay.dshackle.reader.EmptyReader
 import io.emeraldpay.dshackle.reader.Reader
 import io.emeraldpay.dshackle.upstream.Head
 import io.emeraldpay.dshackle.upstream.ethereum.EthereumFullBlocksReader
@@ -30,14 +33,14 @@ import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
 
 open class Caches(
-        private val memBlocksByHash: BlocksMemCache,
-        private val blocksByHeight: HeightCache,
-        private val memTxsByHash: TxMemCache,
-        private val memReceipts: ReceiptMemCache,
-        private val redisBlocksByHash: BlocksRedisCache?,
-        private val redisTxsByHash: TxRedisCache?,
-        private val redisReceipts: ReceiptRedisCache?,
-        private val redisHeightByHashCache: HeightByHashRedisCache?
+    private val memBlocksByHash: BlocksMemCache,
+    private val blocksByHeight: HeightCache,
+    private val memTxsByHash: TxMemCache,
+    private val memReceipts: ReceiptMemCache,
+    private val redisBlocksByHash: BlocksRedisCache?,
+    private val redisTxsByHash: TxRedisCache?,
+    private val redisReceipts: ReceiptRedisCache?,
+    private val redisHeightByHashCache: HeightByHashRedisCache?
 ) {
 
     companion object {
@@ -91,17 +94,17 @@ open class Caches(
         if (currentHeight != null && data.height != null && memReceipts.acceptsRecentBlocks(currentHeight - data.height)) {
             memReceipts.add(data)
         }
-        //TODO move subscription to the caller
+        // TODO move subscription to the caller
         redisReceipts?.add(data)?.subscribe()
     }
 
     fun cache(tag: Tag, tx: TxContainer) {
-        //do not cache transactions that are not in a block yet
+        // do not cache transactions that are not in a block yet
         if (tx.blockId == null) {
             return
         }
         memTxsByHash.add(tx)
-        //TODO move subscription to the caller
+        // TODO move subscription to the caller
         getBlocksByHash().read(tx.blockId).flatMap { block ->
             redisTxsByHash?.add(tx, block) ?: Mono.empty()
         }.subscribe()
@@ -113,14 +116,14 @@ open class Caches(
         redisHeightByHashCache?.add(block)?.let(job::add)
 
         if (tag == Tag.LATEST) {
-            //for LATEST data cache it in memory, it may be short living so better to avoid Redis
+            // for LATEST data cache it in memory, it may be short living so better to avoid Redis
             memoizeBlock(block)
         } else if (tag == Tag.REQUESTED) {
             val blockOnlyContainer: BlockContainer?
             var jsonValue: BlockJson<*>? = null
             if (block.full) {
                 jsonValue = Global.objectMapper.readValue<BlockJson<*>>(block.json, BlockJson::class.java)
-                //shouldn't cache block json with transactions, separate txes and blocks with refs
+                // shouldn't cache block json with transactions, separate txes and blocks with refs
                 val blockOnly = jsonValue.withoutTransactionDetails()
                 blockOnlyContainer = BlockContainer.from(blockOnly)
             } else {
@@ -138,15 +141,17 @@ open class Caches(
                         TxContainer.from(tx)
                     }
                     if (redisTxsByHash != null) {
-                        job.add(Flux.fromIterable(transactions)
+                        job.add(
+                            Flux.fromIterable(transactions)
                                 .doOnNext { memTxsByHash.add(it) }
                                 .flatMap { redisTxsByHash.add(it, block) }
-                                .then())
+                                .then()
+                        )
                     }
                 }
             }
         }
-        Flux.fromIterable(job).flatMap { it }.subscribe() //TODO move out to a caller
+        Flux.fromIterable(job).flatMap { it }.subscribe() // TODO move out to a caller
     }
 
     /**
@@ -156,7 +161,7 @@ open class Caches(
         memBlocksByHash.add(block)
         memHeightByHash.add(block)
         val replaced = blocksByHeight.add(block)
-        //evict cached transactions if an existing block was updated
+        // evict cached transactions if an existing block was updated
         replaced?.let { evict(it) }
     }
 
@@ -222,7 +227,7 @@ open class Caches(
         REQUESTED
     }
 
-    class Builder() {
+    class Builder {
         private var blocksByHash: BlocksMemCache? = null
         private var blocksByHeight: HeightCache? = null
         private var txsByHash: TxMemCache? = null
@@ -285,8 +290,10 @@ open class Caches(
             if (receipts == null) {
                 receipts = ReceiptMemCache()
             }
-            return Caches(blocksByHash!!, blocksByHeight!!, txsByHash!!, receipts!!,
-                    redisBlocksByHash, redisTxsByHash, redisReceiptCache, redisHeightByHashCache)
+            return Caches(
+                blocksByHash!!, blocksByHeight!!, txsByHash!!, receipts!!,
+                redisBlocksByHash, redisTxsByHash, redisReceiptCache, redisHeightByHashCache
+            )
         }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/CachesEnabled.kt

@@ -21,5 +21,4 @@ package io.emeraldpay.dshackle.cache
 interface CachesEnabled {
 
     fun setCaches(caches: Caches)
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/CachesFactory.kt

@@ -27,14 +27,13 @@ import io.lettuce.core.codec.StringCodec
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Repository
-import java.util.*
+import java.util.EnumMap
 import javax.annotation.PostConstruct
 import kotlin.system.exitProcess
 
-
 @Repository
 open class CachesFactory(
-        @Autowired private val cacheConfig: CacheConfig
+    @Autowired private val cacheConfig: CacheConfig
 ) {
 
     companion object {
@@ -50,14 +49,14 @@ open class CachesFactory(
         val redisConfig = cacheConfig.redis ?: return
 
         var uri = RedisURI.builder()
-                .withHost(redisConfig.host)
-                .withPort(redisConfig.port)
+            .withHost(redisConfig.host)
+            .withPort(redisConfig.port)
 
         redisConfig.db?.let { value ->
             uri = uri.withDatabase(value)
         }
 
-        //log URI _before_ adding a password, to avoid leaking it to the log
+        // log URI _before_ adding a password, to avoid leaking it to the log
         log.info("Use Redis cache at: ${uri.build().toURI()}")
 
         redisConfig.password?.let { value ->
@@ -113,4 +112,4 @@ open class CachesFactory(
         }
         return existing
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/CurrentBlockCache.kt

@@ -20,5 +20,4 @@ class CurrentBlockCache<K, D> : Reader<K, D> {
     fun evict() {
         cache.set(ConcurrentHashMap())
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/HeightByHashAdding.kt

@@ -29,9 +29,9 @@ import reactor.core.publisher.Mono
  *
  */
 class HeightByHashAdding(
-        private val mem: Reader<BlockId, Long>,
-        private val redis: HeightByHashCache?,
-        private val upstreamReader: Reader<BlockId, BlockContainer>
+    private val mem: Reader<BlockId, Long>,
+    private val redis: HeightByHashCache?,
+    private val upstreamReader: Reader<BlockId, BlockContainer>
 ) : Reader<BlockId, Long> {
 
     companion object {
@@ -39,7 +39,7 @@ class HeightByHashAdding(
     }
 
     constructor(caches: Caches, upstreamReader: Reader<BlockId, BlockContainer>) :
-            this(caches.getLastHeightByHash(), caches.getRedisHeightByHash(), upstreamReader)
+        this(caches.getLastHeightByHash(), caches.getRedisHeightByHash(), upstreamReader)
 
     private val delegate: Reader<BlockId, Long>
 
@@ -48,26 +48,26 @@ class HeightByHashAdding(
             delegate = object : Reader<BlockId, Long> {
                 override fun read(key: BlockId): Mono<Long> {
                     return mem.read(key)
-                            .switchIfEmpty(
-                                    Mono.just(key)
-                                            .flatMap { redis.read(it) }
-                            )
-                            .switchIfEmpty(
-                                    Mono.just(key)
-                                            .flatMap { upstreamReader.read(it) }
-                                            .flatMap { redis.add(it).then(Mono.just(it.height)) }
-                            )
+                        .switchIfEmpty(
+                            Mono.just(key)
+                                .flatMap { redis.read(it) }
+                        )
+                        .switchIfEmpty(
+                            Mono.just(key)
+                                .flatMap { upstreamReader.read(it) }
+                                .flatMap { redis.add(it).then(Mono.just(it.height)) }
+                        )
                 }
             }
         } else {
             delegate = object : Reader<BlockId, Long> {
                 override fun read(key: BlockId): Mono<Long> {
                     return mem.read(key)
-                            .switchIfEmpty(
-                                    Mono.just(key)
-                                            .flatMap { upstreamReader.read(it) }
-                                            .map { it.height }
-                            )
+                        .switchIfEmpty(
+                            Mono.just(key)
+                                .flatMap { upstreamReader.read(it) }
+                                .map { it.height }
+                        )
                 }
             }
         }
@@ -76,5 +76,4 @@ class HeightByHashAdding(
     override fun read(key: BlockId): Mono<Long> {
         return delegate.read(key)
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/HeightByHashCache.kt

@@ -23,4 +23,4 @@ import reactor.core.publisher.Mono
 interface HeightByHashCache : Reader<BlockId, Long> {
 
     fun add(block: BlockContainer): Mono<Void>
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/HeightByHashMemCache.kt

@@ -23,7 +23,7 @@ import org.slf4j.LoggerFactory
 import reactor.core.publisher.Mono
 
 class HeightByHashMemCache(
-        maxSize: Int = 256
+    maxSize: Int = 256
 ) : Reader<BlockId, Long> {
 
     companion object {
@@ -31,8 +31,8 @@ class HeightByHashMemCache(
     }
 
     private val heights = Caffeine.newBuilder()
-            .maximumSize(maxSize.toLong())
-            .build<BlockId, Long>()
+        .maximumSize(maxSize.toLong())
+        .build<BlockId, Long>()
 
     override fun read(key: BlockId): Mono<Long> {
         return Mono.justOrEmpty(heights.getIfPresent(key))
@@ -41,4 +41,4 @@ class HeightByHashMemCache(
     fun add(block: BlockContainer) {
         heights.put(block.hash, block.height)
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/HeightByHashRedisCache.kt

@@ -32,8 +32,8 @@ import java.util.concurrent.TimeUnit
  * reader would use full block's cache to find out height).
  */
 class HeightByHashRedisCache(
-        private val redis: RedisReactiveCommands<String, ByteArray>,
-        private val chain: Chain
+    private val redis: RedisReactiveCommands<String, ByteArray>,
+    private val chain: Chain
 ) : Reader<BlockId, Long>, HeightByHashCache {
 
     companion object {
@@ -45,41 +45,41 @@ class HeightByHashRedisCache(
     @Suppress("UNCHECKED_CAST")
     override fun read(key: BlockId): Mono<Long> {
         return redis.get(key(key))
-                .flatMap { data ->
-                    Mono.justOrEmpty(fromBytes(data)) as Mono<Long>
-                }.onErrorResume {
-                    log.warn("Failed to read Block Height. ${it.javaClass}:${it.message}")
-                    Mono.empty()
-                }
+            .flatMap { data ->
+                Mono.justOrEmpty(fromBytes(data)) as Mono<Long>
+            }.onErrorResume {
+                log.warn("Failed to read Block Height. ${it.javaClass}:${it.message}")
+                Mono.empty()
+            }
     }
 
     override fun add(block: BlockContainer): Mono<Void> {
         return Mono.just(block)
-                .flatMap { blockData ->
-                    // even if block replaced, the mapping hash-long is still valid, so can be cached for long time
-                    // even for fresh blocks
-                    val ttl = TimeUnit.MINUTES.toSeconds(MAX_CACHE_TIME_MINUTES)
+            .flatMap { blockData ->
+                // even if block replaced, the mapping hash-long is still valid, so can be cached for long time
+                // even for fresh blocks
+                val ttl = TimeUnit.MINUTES.toSeconds(MAX_CACHE_TIME_MINUTES)
 
-                    val key = key(blockData.hash)
-                    val value = asBytes(blockData.height)
-                    redis.setex(key, ttl, value)
-                }
-                .doOnError {
-                    log.warn("Failed to save Block Height. ${it.javaClass}:${it.message}")
-                }
-                //if failed to cache, just continue without it
-                .onErrorResume {
-                    Mono.empty()
-                }
-                .then()
+                val key = key(blockData.hash)
+                val value = asBytes(blockData.height)
+                redis.setex(key, ttl, value)
+            }
+            .doOnError {
+                log.warn("Failed to save Block Height. ${it.javaClass}:${it.message}")
+            }
+            // if failed to cache, just continue without it
+            .onErrorResume {
+                Mono.empty()
+            }
+            .then()
     }
 
     fun asBytes(value: Long): ByteArray {
         val result = ByteArray(8)
         val bb = ByteBuffer.allocate(8)
-                .order(ByteOrder.BIG_ENDIAN)
+            .order(ByteOrder.BIG_ENDIAN)
         bb.asLongBuffer()
-                .put(value)
+            .put(value)
         bb.get(result)
         return result
     }
@@ -89,9 +89,9 @@ class HeightByHashRedisCache(
             return null
         }
         return ByteBuffer.wrap(value)
-                .order(ByteOrder.BIG_ENDIAN)
-                .asLongBuffer()
-                .get()
+            .order(ByteOrder.BIG_ENDIAN)
+            .asLongBuffer()
+            .get()
     }
 
     /**
@@ -100,4 +100,4 @@ class HeightByHashRedisCache(
     fun key(hash: BlockId): String {
         return "height:${chain.id}:${hash.toHex()}"
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/HeightCache.kt

@@ -25,12 +25,12 @@ import reactor.core.publisher.Mono
  * Memory cache for blocks heights, keeps mapping height->hash.
  */
 open class HeightCache(
-        maxSize: Int = 512
+    maxSize: Int = 512
 ) : Reader<Long, BlockId> {
 
     private val heights = Caffeine.newBuilder()
-            .maximumSize(maxSize.toLong())
-            .build<Long, BlockId>()
+        .maximumSize(maxSize.toLong())
+        .build<Long, BlockId>()
 
     override fun read(key: Long): Mono<BlockId> {
         return Mono.justOrEmpty(heights.getIfPresent(key))
@@ -45,5 +45,4 @@ open class HeightCache(
     fun purge() {
         heights.cleanUp()
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/OnBlockRedisCache.kt

@@ -30,9 +30,9 @@ import java.util.concurrent.TimeUnit
 import kotlin.math.min
 
 abstract class OnBlockRedisCache<T>(
-        private val redis: RedisReactiveCommands<String, ByteArray>,
-        private val chain: Chain,
-        private val valueType: ValueContainer.ValueType
+    private val redis: RedisReactiveCommands<String, ByteArray>,
+    private val chain: Chain,
+    private val valueType: ValueContainer.ValueType
 ) : Reader<BlockId, T> {
 
     companion object {
@@ -51,18 +51,18 @@ abstract class OnBlockRedisCache<T>(
 
     fun toProto(block: BlockContainer, value: T): ValueContainer {
         return ValueContainer.newBuilder()
-                .setType(valueType)
-                .setValue(ByteString.copyFrom(serializeValue(value)))
-                .setBlockMeta(buildMeta(block))
-                .build()
+            .setType(valueType)
+            .setValue(ByteString.copyFrom(serializeValue(value)))
+            .setBlockMeta(buildMeta(block))
+            .build()
     }
 
     open fun buildMeta(block: BlockContainer): CachesProto.BlockMeta.Builder {
         return CachesProto.BlockMeta.newBuilder()
-                .setHash(ByteString.copyFrom(block.hash.value))
-                .setHeight(block.height)
-                .setDifficulty(ByteString.copyFrom(block.difficulty.toByteArray()))
-                .setTimestamp(block.timestamp.toEpochMilli())
+            .setHash(ByteString.copyFrom(block.hash.value))
+            .setHeight(block.height)
+            .setDifficulty(ByteString.copyFrom(block.difficulty.toByteArray()))
+            .setTimestamp(block.timestamp.toEpochMilli())
     }
 
     abstract fun serializeValue(value: T): ByteArray
@@ -83,7 +83,7 @@ abstract class OnBlockRedisCache<T>(
      * Key in Redis
      */
     fun key(hash: BlockId): String {
-        return "${prefix}:${chain.id}:${hash.toHex()}"
+        return "$prefix:${chain.id}:${hash.toHex()}"
     }
 
     /**
@@ -92,51 +92,51 @@ abstract class OnBlockRedisCache<T>(
      */
     open fun add(container: BlockContainer, value: T): Mono<Void> {
         return Mono.just(container)
-                .flatMap { block ->
-                    val ttl = cachingTime(block.timestamp)
-                    if (ttl > MIN_CACHE_TIME_SECONDS) {
-                        val key = key(block.hash)
-                        val proto = toProto(block, value)
-                        redis.setex(key, ttl, proto.toByteArray())
-                    } else {
-                        Mono.empty()
-                    }
-                }
-                .doOnError {
-                    log.warn("Failed to save Block to Redis: ${it.message}")
-                }
-                //if failed to cache, just continue without it
-                .onErrorResume {
+            .flatMap { block ->
+                val ttl = cachingTime(block.timestamp)
+                if (ttl > MIN_CACHE_TIME_SECONDS) {
+                    val key = key(block.hash)
+                    val proto = toProto(block, value)
+                    redis.setex(key, ttl, proto.toByteArray())
+                } else {
                     Mono.empty()
                 }
-                .then()
+            }
+            .doOnError {
+                log.warn("Failed to save Block to Redis: ${it.message}")
+            }
+            // if failed to cache, just continue without it
+            .onErrorResume {
+                Mono.empty()
+            }
+            .then()
     }
 
     /**
      * Calculate time to cache the value
      */
     fun cachingTime(blockTime: Instant): Long {
-        //default caching time is age of the block, i.e. block create hour ago
-        //keep for hour, but block created 10 seconds ago cache only for 10 seconds, because it
-        //still can be replaced in the blockchain
+        // default caching time is age of the block, i.e. block create hour ago
+        // keep for hour, but block created 10 seconds ago cache only for 10 seconds, because it
+        // still can be replaced in the blockchain
         val age = Instant.now().epochSecond - blockTime.epochSecond
         return min(age, TimeUnit.MINUTES.toSeconds(MAX_CACHE_TIME_MINUTES))
     }
 
     fun evict(id: BlockId): Mono<Void> {
         return Mono.just(id)
-                .flatMap {
-                    redis.del(key(it))
-                }
-                .then()
+            .flatMap {
+                redis.del(key(it))
+            }
+            .then()
     }
 
     override fun read(key: BlockId): Mono<T> {
         return redis.get(key(key))
-                .map { data ->
-                    fromProto(data)
-                }.onErrorResume {
-                    Mono.empty()
-                }
+            .map { data ->
+                fromProto(data)
+            }.onErrorResume {
+                Mono.empty()
+            }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/OnTxRedisCache.kt

@@ -30,9 +30,9 @@ import java.util.concurrent.TimeUnit
 import kotlin.math.min
 
 abstract class OnTxRedisCache<T>(
-        private val redis: RedisReactiveCommands<String, ByteArray>,
-        private val chain: Chain,
-        private val valueType: CachesProto.ValueContainer.ValueType
+    private val redis: RedisReactiveCommands<String, ByteArray>,
+    private val chain: Chain,
+    private val valueType: CachesProto.ValueContainer.ValueType
 ) : Reader<TxId, T> {
 
     companion object {
@@ -56,42 +56,42 @@ abstract class OnTxRedisCache<T>(
      * Key in Redis
      */
     fun key(hash: TxId): String {
-        return "${prefix}:${chain.id}:${hash.toHex()}"
+        return "$prefix:${chain.id}:${hash.toHex()}"
     }
 
     fun evict(container: BlockContainer): Mono<Void> {
         return Mono.just(container)
-                .map { block ->
-                    block.transactions.map {
-                        key(it)
-                    }.toTypedArray()
-                }.flatMap { keys ->
-                    redis.del(*keys)
-                }.then()
+            .map { block ->
+                block.transactions.map {
+                    key(it)
+                }.toTypedArray()
+            }.flatMap { keys ->
+                redis.del(*keys)
+            }.then()
     }
 
     fun evict(id: TxId): Mono<Void> {
         return Mono.just(id)
-                .flatMap {
-                    redis.del(key(it))
-                }
-                .then()
+            .flatMap {
+                redis.del(key(it))
+            }
+            .then()
     }
 
     fun toProto(id: TxId, value: T): ByteArray {
         val meta = buildMeta(id, value)
 
         return CachesProto.ValueContainer.newBuilder()
-                .setType(valueType)
-                .setValue(ByteString.copyFrom(serializeValue(value)))
-                .setTxMeta(meta)
-                .build()
-                .toByteArray()
+            .setType(valueType)
+            .setValue(ByteString.copyFrom(serializeValue(value)))
+            .setTxMeta(meta)
+            .build()
+            .toByteArray()
     }
 
     open fun buildMeta(id: TxId, value: T): CachesProto.TxMeta.Builder {
         return CachesProto.TxMeta.newBuilder()
-                .setHash(ByteString.copyFrom(id.value))
+            .setHash(ByteString.copyFrom(id.value))
     }
 
     abstract fun serializeValue(value: T): ByteArray
@@ -110,43 +110,43 @@ abstract class OnTxRedisCache<T>(
 
     override fun read(key: TxId): Mono<T> {
         return redis.get(key(key))
-                .map { data ->
-                    fromProto(data)
-                }.onErrorResume {
-                    Mono.empty()
-                }
+            .map { data ->
+                fromProto(data)
+            }.onErrorResume {
+                Mono.empty()
+            }
     }
 
     open fun add(id: TxId, value: T, block: BlockContainer?, blockHeight: Long?): Mono<Void> {
         return Mono.just(id)
-                .flatMap {
-                    val key = key(it)
-                    val encodedValue = toProto(it, value)
-                    val ttl = if (block?.timestamp != null) {
-                        cachingTime(block.timestamp)
-                    } else {
-                        cachingTime(blockHeight)
-                    }
-                    //store
-                    redis.setex(key, ttl, encodedValue)
+            .flatMap {
+                val key = key(it)
+                val encodedValue = toProto(it, value)
+                val ttl = if (block?.timestamp != null) {
+                    cachingTime(block.timestamp)
+                } else {
+                    cachingTime(blockHeight)
                 }
-                .doOnError {
-                    log.warn("Failed to save TX to Redis: ${it.message}", it)
-                }
-                //if failed to cache, just continue without it
-                .onErrorResume {
-                    Mono.empty()
-                }
-                .then()
+                // store
+                redis.setex(key, ttl, encodedValue)
+            }
+            .doOnError {
+                log.warn("Failed to save TX to Redis: ${it.message}", it)
+            }
+            // if failed to cache, just continue without it
+            .onErrorResume {
+                Mono.empty()
+            }
+            .then()
     }
 
     /**
      * Calculate time to cache the value, based on block time
      */
     fun cachingTime(blockTime: Instant): Long {
-        //default caching time is age of the block, i.e. block create hour ago
-        //keep for hour, but block create 10 seconds ago cache for 10 seconds, as it
-        //still can be replaced in the blockchain
+        // default caching time is age of the block, i.e. block create hour ago
+        // keep for hour, but block create 10 seconds ago cache for 10 seconds, as it
+        // still can be replaced in the blockchain
         val age = Instant.now().epochSecond - blockTime.epochSecond
         return min(age, TimeUnit.HOURS.toSeconds(MAX_CACHE_TIME_HOURS))
     }
@@ -165,4 +165,4 @@ abstract class OnTxRedisCache<T>(
         }
         return min(confirmations * BLOCK_TIME_SECONDS, TimeUnit.HOURS.toSeconds(MAX_CACHE_TIME_HOURS))
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/ReceiptMemCache.kt

@@ -28,8 +28,8 @@ import reactor.core.publisher.Mono
  * Keeps receipts for recent blocks in memory
  */
 open class ReceiptMemCache(
-        // how many blocks to keeps in memory
-        val blocks: Int = 6
+    // how many blocks to keeps in memory
+    val blocks: Int = 6
 ) : Reader<TxId, ByteArray> {
 
     companion object {
@@ -37,8 +37,8 @@ open class ReceiptMemCache(
     }
 
     private val mapping = Caffeine.newBuilder()
-            .maximumSize(blocks * 200L)
-            .build<TxId, ByteArray>()
+        .maximumSize(blocks * 200L)
+        .build<TxId, ByteArray>()
 
     open fun evict(block: BlockContainer) {
         block.transactions.forEach {
@@ -60,5 +60,4 @@ open class ReceiptMemCache(
     open fun acceptsRecentBlocks(heightDelta: Long): Boolean {
         return blocks <= heightDelta && heightDelta >= 0
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/ReceiptRedisCache.kt

@@ -16,16 +16,15 @@
 package io.emeraldpay.dshackle.cache
 
 import io.emeraldpay.dshackle.data.DefaultContainer
-import io.emeraldpay.dshackle.data.TxId
 import io.emeraldpay.dshackle.proto.CachesProto
-import io.emeraldpay.grpc.Chain
 import io.emeraldpay.etherjar.rpc.json.TransactionReceiptJson
+import io.emeraldpay.grpc.Chain
 import io.lettuce.core.api.reactive.RedisReactiveCommands
 import reactor.core.publisher.Mono
 
 open class ReceiptRedisCache(
-        redis: RedisReactiveCommands<String, ByteArray>,
-        chain: Chain
+    redis: RedisReactiveCommands<String, ByteArray>,
+    chain: Chain
 ) : OnTxRedisCache<ByteArray>(redis, chain, CachesProto.ValueContainer.ValueType.TX_RECEIPT) {
 
     override fun deserializeValue(value: CachesProto.ValueContainer): ByteArray {
@@ -39,4 +38,4 @@ open class ReceiptRedisCache(
     fun add(json: DefaultContainer<TransactionReceiptJson>): Mono<Void> {
         return super.add(json.txId!!, json.json!!, null, json.height)
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/TxMemCache.kt

@@ -28,8 +28,8 @@ import reactor.core.publisher.Mono
  * Memory cache for transactions
  */
 open class TxMemCache(
-        // usually there is 100-150 tx per block on Ethereum, we keep data for about 32 blocks by default
-        private val maxSize: Int = 125 * 32
+    // usually there is 100-150 tx per block on Ethereum, we keep data for about 32 blocks by default
+    private val maxSize: Int = 125 * 32
 ) : Reader<TxId, TxContainer> {
 
     companion object {
@@ -37,8 +37,8 @@ open class TxMemCache(
     }
 
     private val mapping = Caffeine.newBuilder()
-            .maximumSize(maxSize.toLong())
-            .build<TxId, TxContainer>()
+        .maximumSize(maxSize.toLong())
+        .build<TxId, TxContainer>()
 
     override fun read(key: TxId): Mono<TxContainer> {
         return Mono.justOrEmpty(mapping.getIfPresent(key))
@@ -52,13 +52,13 @@ open class TxMemCache(
 
     open fun evict(block: BlockId) {
         val ids = mapping.asMap()
-                .filter { it.value.blockId == block }
-                .map { it.key }
+            .filter { it.value.blockId == block }
+            .map { it.key }
         mapping.invalidateAll(ids)
     }
 
     open fun add(tx: TxContainer) {
-        //do not cache fresh transactions
+        // do not cache fresh transactions
         if (tx.blockId == null) {
             return
         }
@@ -68,4 +68,4 @@ open class TxMemCache(
     open fun purge() {
         mapping.cleanUp()
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/cache/TxRedisCache.kt

@@ -15,31 +15,26 @@
  */
 package io.emeraldpay.dshackle.cache
 
-import com.fasterxml.jackson.databind.ObjectMapper
 import com.google.protobuf.ByteString
 import io.emeraldpay.dshackle.data.BlockContainer
 import io.emeraldpay.dshackle.data.BlockId
 import io.emeraldpay.dshackle.data.TxContainer
 import io.emeraldpay.dshackle.data.TxId
+import io.emeraldpay.dshackle.proto.CachesProto
 import io.emeraldpay.dshackle.reader.Reader
 import io.emeraldpay.grpc.Chain
-import io.emeraldpay.dshackle.proto.CachesProto
 import io.lettuce.core.api.reactive.RedisReactiveCommands
 import org.slf4j.LoggerFactory
 import reactor.core.publisher.Mono
-import reactor.util.function.Tuples
-import java.time.Instant
-import java.util.concurrent.TimeUnit
-import kotlin.math.min
 
 /**
  * Cache transactions in Redis, up to 24 hours.
  */
 open class TxRedisCache(
-        private val redis: RedisReactiveCommands<String, ByteArray>,
-        private val chain: Chain
+    private val redis: RedisReactiveCommands<String, ByteArray>,
+    private val chain: Chain
 ) : Reader<TxId, TxContainer>,
-        OnTxRedisCache<TxContainer>(redis, chain, CachesProto.ValueContainer.ValueType.TX) {
+    OnTxRedisCache<TxContainer>(redis, chain, CachesProto.ValueContainer.ValueType.TX) {
 
     companion object {
         private val log = LoggerFactory.getLogger(TxRedisCache::class.java)
@@ -67,15 +62,14 @@ open class TxRedisCache(
         }
         val meta = value.txMeta
         return TxContainer(
-                meta.height,
-                TxId(meta.hash.toByteArray()),
-                BlockId(meta.blockHash.toByteArray()),
-                value.value.toByteArray()
+            meta.height,
+            TxId(meta.hash.toByteArray()),
+            BlockId(meta.blockHash.toByteArray()),
+            value.value.toByteArray()
         )
     }
 
     open fun add(tx: TxContainer, block: BlockContainer): Mono<Void> {
         return super.add(tx.hash, tx, block, tx.height)
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/AccessLogConfig.kt

@@ -1,7 +1,7 @@
 package io.emeraldpay.dshackle.config
 
 class AccessLogConfig(
-        val enabled: Boolean = false
+    val enabled: Boolean = false
 ) {
 
     var filename: String = "./access_log.jsonl"
@@ -14,9 +14,8 @@ class AccessLogConfig(
 
         fun disabled(): AccessLogConfig {
             return AccessLogConfig(
-                    enabled = false
+                enabled = false
             )
         }
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/AccessLogReader.kt

@@ -23,5 +23,4 @@ class AccessLogReader : YamlConfigReader(), ConfigReader<AccessLogConfig> {
             }
         } ?: AccessLogConfig.default()
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/AuthConfig.kt

@@ -29,14 +29,14 @@ class AuthConfig {
     }
 
     class ClientBasicAuth(
-            val username: String,
-            val password: String
+        val username: String,
+        val password: String
     ) : ClientAuth()
 
     class ClientTlsAuth(
-            var ca: String? = null,
-            var certificate: String? = null,
-            var key: String? = null
+        var ca: String? = null,
+        var certificate: String? = null,
+        var key: String? = null
     ) : ClientAuth()
 
     /**
@@ -58,4 +58,4 @@ class AuthConfig {
         var clientRequire: Boolean? = null
         var clientCa: String? = null
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/AuthConfigReader.kt

@@ -82,5 +82,4 @@ class AuthConfigReader : YamlConfigReader() {
             auth
         }
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/CacheConfig.kt

@@ -17,12 +17,12 @@ package io.emeraldpay.dshackle.config
 
 class CacheConfig {
 
-    var redis: Redis? = null;
+    var redis: Redis? = null
 
     class Redis(
-            var host: String = "127.0.0.1",
-            var port: Int = 6379,
-            var db: Int? = 0,
-            var password: String? = null
+        var host: String = "127.0.0.1",
+        var port: Int = 6379,
+        var db: Int? = 0,
+        var password: String? = null
     )
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/CacheConfigReader.kt

@@ -58,4 +58,4 @@ class CacheConfigReader : YamlConfigReader(), ConfigReader<CacheConfig> {
             config
         }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/ConfigReader.kt

@@ -20,5 +20,4 @@ import org.yaml.snakeyaml.nodes.MappingNode
 interface ConfigReader<T> {
 
     fun read(input: MappingNode?): T?
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/EnvVariables.kt

@@ -31,4 +31,4 @@ class EnvVariables {
             } ?: ""
         }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/InvalidConfigException.kt

@@ -19,11 +19,11 @@ package io.emeraldpay.dshackle.config
 import org.yaml.snakeyaml.error.Mark
 
 open class InvalidConfigException(
-        message: String
+    message: String
 ) : Exception(message)
 
 class InvalidConfigYamlException(
-        filename: String,
-        mark: Mark,
-        message: String
-) : InvalidConfigException("Invalid YAML configuration ${message}, at ${filename}:${mark.line}")
+    filename: String,
+    mark: Mark,
+    message: String
+) : InvalidConfigException("Invalid YAML configuration $message, at $filename:${mark.line}")

src/main/kotlin/io/emeraldpay/dshackle/config/MainConfig.kt

@@ -25,4 +25,4 @@ class MainConfig {
     var tokens: TokensConfig? = null
     var monitoring: MonitoringConfig = MonitoringConfig.default()
     var accessLogConfig: AccessLogConfig = AccessLogConfig.default()
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/MainConfigReader.kt

@@ -21,7 +21,7 @@ import org.yaml.snakeyaml.nodes.MappingNode
 import java.io.InputStream
 
 class MainConfigReader(
-        fileResolver: FileResolver
+    fileResolver: FileResolver
 ) : YamlConfigReader(), ConfigReader<MainConfig> {
 
     companion object {
@@ -73,5 +73,4 @@ class MainConfigReader(
         }
         return config
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/MonitoringConfig.kt

@@ -16,14 +16,15 @@
 package io.emeraldpay.dshackle.config
 
 class MonitoringConfig(
-        val enabled: Boolean,
-        val prometheus: PrometheusConfig
+    val enabled: Boolean,
+    val prometheus: PrometheusConfig
 ) {
 
     companion object {
         fun default(): MonitoringConfig {
             return MonitoringConfig(true, PrometheusConfig.default())
         }
+
         fun disabled(): MonitoringConfig {
             return MonitoringConfig(false, PrometheusConfig.disabled())
         }
@@ -33,19 +34,19 @@ class MonitoringConfig(
     var enableExtended: Boolean = false
 
     data class PrometheusConfig(
-            val enabled: Boolean,
-            val path: String,
-            val host: String,
-            val port: Int
+        val enabled: Boolean,
+        val path: String,
+        val host: String,
+        val port: Int
     ) {
         companion object {
             fun default(): PrometheusConfig {
                 return PrometheusConfig(true, "/metrics", "127.0.0.1", 8081)
             }
+
             fun disabled(): PrometheusConfig {
                 return PrometheusConfig(false, "/", "127.0.0.1", 0)
             }
         }
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/MonitoringConfigReader.kt

@@ -19,7 +19,7 @@ import org.slf4j.LoggerFactory
 import org.yaml.snakeyaml.nodes.MappingNode
 import java.io.InputStream
 
-class MonitoringConfigReader: YamlConfigReader(), ConfigReader<MonitoringConfig> {
+class MonitoringConfigReader : YamlConfigReader(), ConfigReader<MonitoringConfig> {
 
     companion object {
         private val log = LoggerFactory.getLogger(MonitoringConfigReader::class.java)
@@ -64,5 +64,4 @@ class MonitoringConfigReader: YamlConfigReader(), ConfigReader<MonitoringConfig>
         val port = getValueAsInt(input, "port") ?: default.port
         return MonitoringConfig.PrometheusConfig(enabled, path, host, port)
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/ProxyConfig.kt

@@ -24,7 +24,7 @@ import io.emeraldpay.grpc.Chain
 open class ProxyConfig {
 
     companion object {
-        public const val CONFIG_ID = "parsed.proxy"
+        const val CONFIG_ID = "parsed.proxy"
     }
 
     var enabled: Boolean = true
@@ -50,13 +50,13 @@ open class ProxyConfig {
     var routes: List<Route> = ArrayList()
 
     class Route(
-            /**
-             * URL binding for the route. http://$host:$port/$id
-             */
-            val id: String,
-            /**
-             * Blockchain to dispatch requests
-             */
-            val blockchain: Chain
+        /**
+         * URL binding for the route. http://$host:$port/$id
+         */
+        val id: String,
+        /**
+         * Blockchain to dispatch requests
+         */
+        val blockchain: Chain
     )
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/ProxyConfigReader.kt

@@ -19,10 +19,8 @@ package io.emeraldpay.dshackle.config
 import io.emeraldpay.grpc.Chain
 import org.apache.commons.lang3.StringUtils
 import org.slf4j.LoggerFactory
-import org.yaml.snakeyaml.Yaml
 import org.yaml.snakeyaml.nodes.MappingNode
 import java.io.InputStream
-import java.io.InputStreamReader
 
 /**
  * Read YAML config, part related to Proxy configuration
@@ -84,5 +82,4 @@ class ProxyConfigReader : YamlConfigReader(), ConfigReader<ProxyConfig> {
         config.tls = authConfigReader.readServerTls(input)
         return config
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/TokensConfig.kt

@@ -15,12 +15,12 @@
  */
 package io.emeraldpay.dshackle.config
 
+import io.emeraldpay.etherjar.domain.Address
 import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.grpc.Chain
-import io.emeraldpay.etherjar.domain.Address
 
 class TokensConfig(
-        val tokens: List<Token>
+    val tokens: List<Token>
 ) {
 
     class Token {
@@ -30,7 +30,7 @@ class TokensConfig(
 
         // coin name
         var name: String? = null
-        var type: Type? = null;
+        var type: Type? = null
         var address: String? = null
 
         fun validate(): String? {
@@ -40,9 +40,9 @@ class TokensConfig(
                 name.isNullOrBlank() -> "name"
                 type == null -> type
                 address.isNullOrBlank() -> "address"
-                blockchain != null
-                        && BlockchainType.from(blockchain!!) == BlockchainType.ETHEREUM
-                        && !Address.isValidAddress(address) -> "address"
+                blockchain != null &&
+                    BlockchainType.from(blockchain!!) == BlockchainType.ETHEREUM &&
+                    !Address.isValidAddress(address) -> "address"
                 else -> null
             }
         }
@@ -51,5 +51,4 @@ class TokensConfig(
     enum class Type {
         ERC20
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/TokensConfigReader.kt

@@ -18,7 +18,7 @@ package io.emeraldpay.dshackle.config
 import org.slf4j.LoggerFactory
 import org.yaml.snakeyaml.nodes.MappingNode
 import java.io.InputStream
-import java.util.*
+import java.util.Locale
 
 class TokensConfigReader : YamlConfigReader(), ConfigReader<TokensConfig> {
 
@@ -60,5 +60,4 @@ class TokensConfigReader : YamlConfigReader(), ConfigReader<TokensConfig> {
             TokensConfig(it)
         }
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/UpstreamsConfig.kt

@@ -17,11 +17,9 @@
 package io.emeraldpay.dshackle.config
 
 import io.emeraldpay.dshackle.Defaults
-import java.lang.ClassCastException
 import java.net.URI
-import java.util.*
-import kotlin.collections.ArrayList
-import kotlin.collections.HashMap
+import java.util.Arrays
+import java.util.Locale
 
 open class UpstreamsConfig {
     var defaultOptions: MutableList<DefaultOptions> = ArrayList<DefaultOptions>()
@@ -46,8 +44,10 @@ open class UpstreamsConfig {
             }
             val copy = Options()
             copy.minPeers = if (this.minPeers != null) this.minPeers else additional.minPeers
-            copy.disableValidation = if (this.disableValidation != null) this.disableValidation else additional.disableValidation
-            copy.providesBalance = if (this.providesBalance != null) this.providesBalance else additional.providesBalance
+            copy.disableValidation =
+                if (this.disableValidation != null) this.disableValidation else additional.disableValidation
+            copy.providesBalance =
+                if (this.providesBalance != null) this.providesBalance else additional.providesBalance
             return copy
         }
 
@@ -60,7 +60,6 @@ open class UpstreamsConfig {
                 return options
             }
         }
-
     }
 
     class DefaultOptions : Options() {
@@ -125,14 +124,14 @@ open class UpstreamsConfig {
         var msgSize: Int? = null
     }
 
-
-    //TODO make it unmodifiable after initial load
-    class Labels: HashMap<String, String>() {
+    // TODO make it unmodifiable after initial load
+    class Labels : HashMap<String, String>() {
 
         companion object {
-            @JvmStatic fun fromMap(map: Map<String, String>): Labels {
+            @JvmStatic
+            fun fromMap(map: Map<String, String>): Labels {
                 val labels = Labels()
-                map.entries.forEach() { kv ->
+                map.entries.forEach { kv ->
                     labels.put(kv.key, kv.value)
                 }
                 return labels
@@ -140,7 +139,7 @@ open class UpstreamsConfig {
         }
     }
 
-    enum class UpstreamType private constructor(vararg code: String) {
+    enum class UpstreamType(vararg code: String) {
         ETHEREUM_JSON_RPC("ethereum"),
         BITCOIN_JSON_RPC("bitcoin"),
         DSHACKLE("dshackle", "grpc"),
@@ -168,12 +167,12 @@ open class UpstreamsConfig {
     }
 
     class Methods(
-            val enabled: Set<Method>,
-            val disabled: Set<Method>
+        val enabled: Set<Method>,
+        val disabled: Set<Method>
     )
 
     class Method(
-            val name: String,
-            val quorum: String? = null
+        val name: String,
+        val quorum: String? = null
     )
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/UpstreamsConfigReader.kt

@@ -23,14 +23,12 @@ import org.yaml.snakeyaml.nodes.MappingNode
 import org.yaml.snakeyaml.nodes.ScalarNode
 import reactor.util.function.Tuples
 import java.io.InputStream
-import java.lang.IllegalArgumentException
 import java.net.URI
 import java.time.Duration
-import java.util.*
-import kotlin.collections.ArrayList
+import java.util.Locale
 
 class UpstreamsConfigReader(
-        private val fileResolver: FileResolver
+    private val fileResolver: FileResolver
 ) : YamlConfigReader(), ConfigReader<UpstreamsConfig> {
 
     private val log = LoggerFactory.getLogger(UpstreamsConfigReader::class.java)
@@ -198,7 +196,10 @@ class UpstreamsConfigReader(
         upstream.methods = tryReadMethods(upNode)
     }
 
-    internal fun readUpstreamGrpc(upNode: MappingNode, upstream: UpstreamsConfig.Upstream<UpstreamsConfig.GrpcConnection>) {
+    internal fun readUpstreamGrpc(
+        upNode: MappingNode,
+        upstream: UpstreamsConfig.Upstream<UpstreamsConfig.GrpcConnection>
+    ) {
         if (hasAny(upNode, "labels")) {
             log.warn("Labels should be not applied to gRPC upstream")
         }
@@ -221,13 +222,13 @@ class UpstreamsConfigReader(
         if (hasAny(upNode, "labels")) {
             getMapping(upNode, "labels")?.let { labels ->
                 labels.value.stream()
-                        .filter { n -> n.keyNode is ScalarNode && n.valueNode is ScalarNode }
-                        .map { n -> Tuples.of((n.keyNode as ScalarNode).value, (n.valueNode as ScalarNode).value) }
-                        .map { kv -> Tuples.of(kv.t1.trim(), kv.t2.trim()) }
-                        .filter { kv -> StringUtils.isNotEmpty(kv.t1) && StringUtils.isNotEmpty(kv.t2) }
-                        .forEach { kv ->
-                            upstream.labels[kv.t1] = kv.t2
-                        }
+                    .filter { n -> n.keyNode is ScalarNode && n.valueNode is ScalarNode }
+                    .map { n -> Tuples.of((n.keyNode as ScalarNode).value, (n.valueNode as ScalarNode).value) }
+                    .map { kv -> Tuples.of(kv.t1.trim(), kv.t2.trim()) }
+                    .filter { kv -> StringUtils.isNotEmpty(kv.t1) && StringUtils.isNotEmpty(kv.t2) }
+                    .forEach { kv ->
+                        upstream.labels[kv.t1] = kv.t2
+                    }
             }
         }
     }
@@ -247,21 +248,21 @@ class UpstreamsConfigReader(
             val enabled = getList<MappingNode>(mnode, "enabled")?.value?.map { m ->
                 getValueAsString(m, "name")?.let { name ->
                     UpstreamsConfig.Method(
-                            name = name,
-                            quorum = getValueAsString(m, "quorum")
+                        name = name,
+                        quorum = getValueAsString(m, "quorum")
                     )
                 }
             }?.filterNotNull()?.toSet() ?: emptySet()
             val disabled = getList<MappingNode>(mnode, "disabled")?.value?.map { m ->
                 getValueAsString(m, "name")?.let { name ->
                     UpstreamsConfig.Method(
-                            name = name
+                        name = name
                     )
                 }
             }?.filterNotNull()?.toSet() ?: emptySet()
 
             UpstreamsConfig.Methods(
-                    enabled, disabled
+                enabled, disabled
             )
         }
     }
@@ -282,5 +283,4 @@ class UpstreamsConfigReader(
         }
         return options
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/config/YamlConfigReader.kt

@@ -24,7 +24,7 @@ import org.yaml.snakeyaml.nodes.Node
 import org.yaml.snakeyaml.nodes.ScalarNode
 import java.io.InputStream
 import java.io.InputStreamReader
-import java.util.*
+import java.util.Locale
 
 abstract class YamlConfigReader {
     private val envVariables = EnvVariables()
@@ -43,12 +43,12 @@ abstract class YamlConfigReader {
             return false
         }
         return mappingNode.value
-                .stream()
-                .filter { n -> n.keyNode is ScalarNode }
-                .filter { n ->
-                    val sn = n.keyNode as ScalarNode
-                    key == sn.value
-                }.count() > 0
+            .stream()
+            .filter { n -> n.keyNode is ScalarNode }
+            .filter { n ->
+                val sn = n.keyNode as ScalarNode
+                key == sn.value
+            }.count() > 0
     }
 
     @Suppress("UNCHECKED_CAST")
@@ -57,20 +57,20 @@ abstract class YamlConfigReader {
             return null
         }
         return mappingNode.value
-                .stream()
-                .filter { n -> n.keyNode is ScalarNode && type.isAssignableFrom(n.valueNode.javaClass) }
-                .filter { n ->
-                    val sn = n.keyNode as ScalarNode
-                    key == sn.value
-                }
-                .map { n -> n.valueNode as T }
-                .findFirst().let {
-                    if (it.isPresent) {
-                        it.get()
-                    } else {
-                        null
-                    }
+            .stream()
+            .filter { n -> n.keyNode is ScalarNode && type.isAssignableFrom(n.valueNode.javaClass) }
+            .filter { n ->
+                val sn = n.keyNode as ScalarNode
+                key == sn.value
+            }
+            .map { n -> n.valueNode as T }
+            .findFirst().let {
+                if (it.isPresent) {
+                    it.get()
+                } else {
+                    null
                 }
+            }
     }
 
     protected fun getMapping(mappingNode: MappingNode?, key: String): MappingNode? {
@@ -89,8 +89,8 @@ abstract class YamlConfigReader {
 
     protected fun getListOfString(mappingNode: MappingNode?, key: String): List<String>? {
         return getList<ScalarNode>(mappingNode, key)?.value
-                ?.map { it.value }
-                ?.map(envVariables::postProcess)
+            ?.map { it.value }
+            ?.map(envVariables::postProcess)
     }
 
     protected fun getValueAsString(mappingNode: MappingNode?, key: String): String? {
@@ -130,7 +130,7 @@ abstract class YamlConfigReader {
     fun getValueAsBytes(mappingNode: MappingNode?, key: String): Int? {
         return getValueAsString(mappingNode, key)?.let(envVariables::postProcess)?.let {
             val m = Regex("^(\\d+)(m|mb|k|kb|b)?$").find(it.lowercase().trim())
-                    ?: throw IllegalArgumentException("Not a data size: ${it}. Example of correct values: '1024', '1kb', '5mb'")
+                ?: throw IllegalArgumentException("Not a data size: $it. Example of correct values: '1024', '1kb', '5mb'")
             val multiplier = m.groups[2]?.let {
                 when (it.value) {
                     "k", "kb" -> 1024
@@ -147,9 +147,9 @@ abstract class YamlConfigReader {
 
     fun getBlockchain(id: String): Chain {
         return Chain.values().find { chain ->
-            chain.name == id.uppercase(Locale.getDefault())
-                    || chain.chainCode.uppercase(Locale.getDefault()) == id.uppercase(Locale.getDefault())
-                    || chain.id.toString() == id
+            chain.name == id.uppercase(Locale.getDefault()) ||
+                chain.chainCode.uppercase(Locale.getDefault()) == id.uppercase(Locale.getDefault()) ||
+                chain.id.toString() == id
         } ?: Chain.UNSPECIFIED
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/data/BlockContainer.kt

@@ -23,14 +23,14 @@ import java.math.BigInteger
 import java.time.Instant
 
 class BlockContainer(
-        val height: Long,
-        val hash: BlockId,
-        val difficulty: BigInteger,
-        val timestamp: Instant,
-        val full: Boolean,
-        json: ByteArray?,
-        val parsed: Any?,
-        val transactions: List<TxId> = emptyList()
+    val height: Long,
+    val hash: BlockId,
+    val difficulty: BigInteger,
+    val timestamp: Instant,
+    val full: Boolean,
+    json: ByteArray?,
+    val parsed: Any?,
+    val transactions: List<TxId> = emptyList()
 ) : SourceContainer(json, parsed) {
 
     companion object {
@@ -38,14 +38,14 @@ class BlockContainer(
         fun from(block: BlockJson<*>, raw: ByteArray): BlockContainer {
             val hasTransactions = block.transactions?.filterIsInstance<TransactionJson>()?.count() ?: 0 > 0
             return BlockContainer(
-                    block.number,
-                    BlockId.from(block),
-                    block.totalDifficulty,
-                    block.timestamp,
-                    hasTransactions,
-                    raw,
-                    block,
-                    block.transactions?.map { TxId.from(it.hash) } ?: emptyList()
+                block.number,
+                BlockId.from(block),
+                block.totalDifficulty,
+                block.timestamp,
+                hasTransactions,
+                raw,
+                block,
+                block.transactions?.map { TxId.from(it.hash) } ?: emptyList()
             )
         }
 
@@ -88,6 +88,4 @@ class BlockContainer(
         result = 31 * result + hash.hashCode()
         return result
     }
-
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/data/BlockId.kt

@@ -21,7 +21,7 @@ import io.emeraldpay.etherjar.rpc.json.BlockJson
 import org.bouncycastle.util.encoders.Hex
 
 class BlockId(
-        value: ByteArray
+    value: ByteArray
 ) : HashId(value) {
 
     companion object {
@@ -51,6 +51,4 @@ class BlockId(
             return BlockId(bytes)
         }
     }
-
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/data/DefaultContainer.kt

@@ -18,14 +18,14 @@ package io.emeraldpay.dshackle.data
 import org.slf4j.LoggerFactory
 
 class DefaultContainer<T>(
-        val txId: TxId?,
-        val blockId: BlockId?,
-        val height: Long?,
-        json: ByteArray,
-        parsed: T
+    val txId: TxId?,
+    val blockId: BlockId?,
+    val height: Long?,
+    json: ByteArray,
+    parsed: T
 ) : SourceContainer(json, parsed) {
 
     companion object {
         private val log = LoggerFactory.getLogger(DefaultContainer::class.java)
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/data/HashId.kt

@@ -17,7 +17,7 @@
 package io.emeraldpay.dshackle.data
 
 open class HashId(
-        val value: ByteArray
+    val value: ByteArray
 ) {
 
     companion object {
@@ -56,6 +56,4 @@ open class HashId(
     override fun hashCode(): Int {
         return value.contentHashCode()
     }
-
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/data/RawJsonBuilder.kt

@@ -36,7 +36,7 @@ class RawJsonBuilder {
         buf.write(START)
         buf.write(COMMA)
         buf.write(ID_START)
-        buf.write(id.toString().toByteArray());
+        buf.write(id.toString().toByteArray())
         buf.write(COMMA)
         buf.write(RESULT_START)
         buf.write(data)
@@ -44,6 +44,4 @@ class RawJsonBuilder {
 
         return buf.toByteArray()
     }
-
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/data/SourceContainer.kt

@@ -16,11 +16,9 @@
  */
 package io.emeraldpay.dshackle.data
 
-import java.lang.ClassCastException
-
 abstract class SourceContainer(
-        val json: ByteArray?,
-        private val parsed: Any?
+    val json: ByteArray?,
+    private val parsed: Any?
 ) {
 
     @Suppress("UNCHECKED_CAST")
@@ -34,7 +32,6 @@ abstract class SourceContainer(
         throw ClassCastException("Cannot cast ${parsed.javaClass} to $clazz")
     }
 
-
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
         if (other !is SourceContainer) return false
@@ -50,4 +47,4 @@ abstract class SourceContainer(
     override fun hashCode(): Int {
         return json?.contentHashCode() ?: 0
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/data/TxContainer.kt

@@ -20,11 +20,11 @@ import io.emeraldpay.dshackle.Global
 import io.emeraldpay.etherjar.rpc.json.TransactionJson
 
 class TxContainer(
-        val height: Long?,
-        val hash: TxId,
-        val blockId: BlockId?,
-        json: ByteArray?,
-        parsed: Any? = null
+    val height: Long?,
+    val hash: TxId,
+    val blockId: BlockId?,
+    json: ByteArray?,
+    parsed: Any? = null
 ) : SourceContainer(json, parsed) {
 
     companion object {
@@ -41,11 +41,11 @@ class TxContainer(
 
         fun from(tx: TransactionJson, raw: ByteArray): TxContainer {
             return TxContainer(
-                    tx.blockNumber,
-                    TxId.from(tx.hash),
-                    tx.blockHash?.let { BlockId.from(it) },
-                    raw,
-                    tx
+                tx.blockNumber,
+                TxId.from(tx.hash),
+                tx.blockHash?.let { BlockId.from(it) },
+                raw,
+                tx
             )
         }
     }
@@ -70,6 +70,4 @@ class TxContainer(
         result = 31 * result + hash.hashCode()
         return result
     }
-
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/data/TxId.kt

@@ -19,10 +19,9 @@ package io.emeraldpay.dshackle.data
 import io.emeraldpay.etherjar.domain.TransactionId
 import io.emeraldpay.etherjar.rpc.json.TransactionJson
 import org.bouncycastle.util.encoders.Hex
-import java.math.BigInteger
 
 class TxId(
-        value: ByteArray
+    value: ByteArray
 ) : HashId(value) {
 
     companion object {
@@ -47,4 +46,4 @@ class TxId(
             return TxId(bytes)
         }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/monitoring/MonitoringSetup.kt

@@ -26,20 +26,18 @@ import io.micrometer.core.instrument.binder.jvm.JvmMemoryMetrics
 import io.micrometer.core.instrument.binder.jvm.JvmThreadMetrics
 import io.micrometer.core.instrument.binder.system.ProcessorMetrics
 import io.micrometer.core.instrument.config.MeterFilter
-import org.slf4j.LoggerFactory
-import org.springframework.stereotype.Service
 import io.micrometer.prometheus.PrometheusConfig
-
 import io.micrometer.prometheus.PrometheusMeterRegistry
+import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.stereotype.Service
 import java.io.IOException
 import java.net.InetSocketAddress
 import javax.annotation.PostConstruct
 
-
 @Service
 class MonitoringSetup(
-        @Autowired private val monitoringConfig: MonitoringConfig
+    @Autowired private val monitoringConfig: MonitoringConfig
 ) {
 
     companion object {
@@ -50,7 +48,7 @@ class MonitoringSetup(
     fun setup() {
         val prometheusRegistry = PrometheusMeterRegistry(PrometheusConfig.DEFAULT)
         Metrics.globalRegistry.add(prometheusRegistry)
-        Metrics.globalRegistry.config().meterFilter(object: MeterFilter {
+        Metrics.globalRegistry.config().meterFilter(object : MeterFilter {
             override fun map(id: Meter.Id): Meter.Id {
                 if (id.name.startsWith("jvm") || id.name.startsWith("process") || id.name.startsWith("system")) {
                     return id
@@ -76,18 +74,24 @@ class MonitoringSetup(
             // prometheus is a single thread periodic call, no reason to setup anything complex
             try {
                 log.info("Run Prometheus metrics on ${monitoringConfig.prometheus.host}:${monitoringConfig.prometheus.port}${monitoringConfig.prometheus.path}")
-                val server = HttpServer.create(InetSocketAddress(monitoringConfig.prometheus.host, monitoringConfig.prometheus.port), 0);
+                val server = HttpServer.create(
+                    InetSocketAddress(
+                        monitoringConfig.prometheus.host,
+                        monitoringConfig.prometheus.port
+                    ),
+                    0
+                )
                 server.createContext(monitoringConfig.prometheus.path) { httpExchange ->
                     val response = prometheusRegistry.scrape()
-                    httpExchange.sendResponseHeaders(200, response.toByteArray().size.toLong());
+                    httpExchange.sendResponseHeaders(200, response.toByteArray().size.toLong())
                     httpExchange.responseBody.use { os ->
                         os.write(response.toByteArray())
                     }
                 }
-                Thread(server::start).start();
+                Thread(server::start).start()
             } catch (e: IOException) {
                 log.error("Failed to start Prometheus Server", e)
             }
         }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/monitoring/accesslog/AccessHandlerGrpc.kt

@@ -15,14 +15,20 @@
  */
 package io.emeraldpay.dshackle.monitoring.accesslog
 
-import io.grpc.*
+import io.grpc.ForwardingServerCall
+import io.grpc.ForwardingServerCallListener
+import io.grpc.Metadata
+import io.grpc.MethodDescriptor
+import io.grpc.ServerCall
+import io.grpc.ServerCallHandler
+import io.grpc.ServerInterceptor
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Service
 
 @Service
 class AccessHandlerGrpc(
-        @Autowired private val accessLogWriter: AccessLogWriter
+    @Autowired private val accessLogWriter: AccessLogWriter
 ) : ServerInterceptor {
 
     companion object {
@@ -30,9 +36,10 @@ class AccessHandlerGrpc(
     }
 
     override fun <ReqT : Any, RespT : Any> interceptCall(
-            call: ServerCall<ReqT, RespT>,
-            headers: Metadata,
-            next: ServerCallHandler<ReqT, RespT>): ServerCall.Listener<ReqT> {
+        call: ServerCall<ReqT, RespT>,
+        headers: Metadata,
+        next: ServerCallHandler<ReqT, RespT>
+    ): ServerCall.Listener<ReqT> {
 
         return when (val method = call.methodDescriptor.bareMethodName) {
             "SubscribeHead" -> processSubscribeHead(call, headers, next)
@@ -51,103 +58,109 @@ class AccessHandlerGrpc(
     }
 
     private fun <ReqT : Any, RespT : Any, E> process(
-            call: ServerCall<ReqT, RespT>,
-            headers: Metadata,
-            next: ServerCallHandler<ReqT, RespT>,
-            builder: EventsBuilder.RequestReply<E, ReqT, RespT>
+        call: ServerCall<ReqT, RespT>,
+        headers: Metadata,
+        next: ServerCallHandler<ReqT, RespT>,
+        builder: EventsBuilder.RequestReply<E, ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
         builder.start(headers, call.attributes)
         val callWrapper: ServerCall<ReqT, RespT> = StdCallResponse(
-                call, builder, accessLogWriter
+            call, builder, accessLogWriter
         )
         return StdCallListener(
-                next.startCall(callWrapper, headers),
-                builder
+            next.startCall(callWrapper, headers),
+            builder
         )
     }
 
     @Suppress("UNCHECKED_CAST")
     private fun <ReqT : Any, RespT : Any> processSubscribeHead(
-            call: ServerCall<ReqT, RespT>,
-            headers: Metadata,
-            next: ServerCallHandler<ReqT, RespT>
+        call: ServerCall<ReqT, RespT>,
+        headers: Metadata,
+        next: ServerCallHandler<ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
-                EventsBuilder.SubscribeHead() as EventsBuilder.RequestReply<*, ReqT, RespT>
+        return process(
+            call, headers, next,
+            EventsBuilder.SubscribeHead() as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
 
     @Suppress("UNCHECKED_CAST")
     private fun <ReqT : Any, RespT : Any> processSubscribeBalance(
-            call: ServerCall<ReqT, RespT>,
-            headers: Metadata,
-            next: ServerCallHandler<ReqT, RespT>,
-            subscribe: Boolean
+        call: ServerCall<ReqT, RespT>,
+        headers: Metadata,
+        next: ServerCallHandler<ReqT, RespT>,
+        subscribe: Boolean
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
-                EventsBuilder.SubscribeBalance(subscribe) as EventsBuilder.RequestReply<*, ReqT, RespT>
+        return process(
+            call, headers, next,
+            EventsBuilder.SubscribeBalance(subscribe) as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
 
     @Suppress("UNCHECKED_CAST")
     private fun <ReqT : Any, RespT : Any> processSubscribeTxStatus(
-            call: ServerCall<ReqT, RespT>,
-            headers: Metadata,
-            next: ServerCallHandler<ReqT, RespT>
+        call: ServerCall<ReqT, RespT>,
+        headers: Metadata,
+        next: ServerCallHandler<ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
-                EventsBuilder.TxStatus() as EventsBuilder.RequestReply<*, ReqT, RespT>
+        return process(
+            call, headers, next,
+            EventsBuilder.TxStatus() as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
 
     @Suppress("UNCHECKED_CAST")
     private fun <ReqT : Any, RespT : Any> processNativeCall(
-            call: ServerCall<ReqT, RespT>,
-            headers: Metadata,
-            next: ServerCallHandler<ReqT, RespT>
+        call: ServerCall<ReqT, RespT>,
+        headers: Metadata,
+        next: ServerCallHandler<ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
-                EventsBuilder.NativeCall() as EventsBuilder.RequestReply<*, ReqT, RespT>
+        return process(
+            call, headers, next,
+            EventsBuilder.NativeCall() as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
 
     @Suppress("UNCHECKED_CAST")
     private fun <ReqT : Any, RespT : Any> processNativeSubscribe(
-            call: ServerCall<ReqT, RespT>,
-            headers: Metadata,
-            next: ServerCallHandler<ReqT, RespT>
+        call: ServerCall<ReqT, RespT>,
+        headers: Metadata,
+        next: ServerCallHandler<ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
-                EventsBuilder.NativeSubscribe() as EventsBuilder.RequestReply<*, ReqT, RespT>
+        return process(
+            call, headers, next,
+            EventsBuilder.NativeSubscribe() as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
 
-
     @Suppress("UNCHECKED_CAST")
     private fun <ReqT : Any, RespT : Any> processDescribe(
-            call: ServerCall<ReqT, RespT>,
-            headers: Metadata,
-            next: ServerCallHandler<ReqT, RespT>
+        call: ServerCall<ReqT, RespT>,
+        headers: Metadata,
+        next: ServerCallHandler<ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
-                EventsBuilder.Describe() as EventsBuilder.RequestReply<*, ReqT, RespT>
+        return process(
+            call, headers, next,
+            EventsBuilder.Describe() as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
 
     @Suppress("UNCHECKED_CAST")
     private fun <ReqT : Any, RespT : Any> processStatus(
-            call: ServerCall<ReqT, RespT>,
-            headers: Metadata,
-            next: ServerCallHandler<ReqT, RespT>
+        call: ServerCall<ReqT, RespT>,
+        headers: Metadata,
+        next: ServerCallHandler<ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
-                EventsBuilder.Status() as EventsBuilder.RequestReply<*, ReqT, RespT>
+        return process(
+            call, headers, next,
+            EventsBuilder.Status() as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
 
     open class StdCallListener<Req, EB : EventsBuilder.RequestReply<*, Req, *>>(
-            val next: ServerCall.Listener<Req>,
-            val builder: EB
+        val next: ServerCall.Listener<Req>,
+        val builder: EB
     ) : ForwardingServerCallListener<Req>() {
 
         override fun onMessage(message: Req) {
@@ -161,9 +174,9 @@ class AccessHandlerGrpc(
     }
 
     open class StdCallResponse<ReqT : Any, RespT : Any, EB : EventsBuilder.RequestReply<*, ReqT, RespT>>(
-            val next: ServerCall<ReqT, RespT>,
-            val builder: EB,
-            val accessLogWriter: AccessLogWriter
+        val next: ServerCall<ReqT, RespT>,
+        val builder: EB,
+        val accessLogWriter: AccessLogWriter
     ) : ForwardingServerCall<ReqT, RespT>() {
 
         override fun getMethodDescriptor(): MethodDescriptor<ReqT, RespT> {
@@ -177,9 +190,8 @@ class AccessHandlerGrpc(
         override fun sendMessage(message: RespT) {
             super.sendMessage(message)
             accessLogWriter.submit(
-                    builder.onReply(message)!!
+                builder.onReply(message)!!
             )
         }
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/monitoring/accesslog/AccessHandlerHttp.kt

@@ -19,8 +19,8 @@ import kotlin.concurrent.withLock
  */
 @Service
 class AccessHandlerHttp(
-        @Autowired private val mainConfig: MainConfig,
-        @Autowired accessLogWriter: AccessLogWriter
+    @Autowired private val mainConfig: MainConfig,
+    @Autowired accessLogWriter: AccessLogWriter
 ) {
 
     companion object {
@@ -40,7 +40,7 @@ class AccessHandlerHttp(
         fun create(req: HttpServerRequest, blockchain: Chain): RequestHandler
     }
 
-    class NoOpFactory() : HandlerFactory {
+    class NoOpFactory : HandlerFactory {
         override fun create(req: HttpServerRequest, blockchain: Chain): RequestHandler {
             return NoOpHandler()
         }
@@ -70,9 +70,9 @@ class AccessHandlerHttp(
     }
 
     class StandardHandler(
-            private val accessLogWriter: AccessLogWriter,
-            private val httpRequest: HttpServerRequest,
-            private val blockchain: Chain
+        private val accessLogWriter: AccessLogWriter,
+        private val httpRequest: HttpServerRequest,
+        private val blockchain: Chain
     ) : RequestHandler {
 
         private var request: BlockchainOuterClass.NativeCallRequest? = null
@@ -89,13 +89,13 @@ class AccessHandlerHttp(
             builder.start(httpRequest)
             builder.onRequest(request!!)
             responses
-                    .map {
-                        builder.onReply(it, Events.Channel.JSONRPC).also { item ->
-                            //since for JSON RPC you get a single response then the timestamp of all items included in it must have the same timestamp
-                            item.ts = responseTime
-                        }
+                .map {
+                    builder.onReply(it, Events.Channel.JSONRPC).also { item ->
+                        // since for JSON RPC you get a single response then the timestamp of all items included in it must have the same timestamp
+                        item.ts = responseTime
                     }
-                    .let(accessLogWriter::submit)
+                }
+                .let(accessLogWriter::submit)
         }
 
         override fun onRequest(request: BlockchainOuterClass.NativeCallRequest) {
@@ -108,4 +108,4 @@ class AccessHandlerHttp(
             }
         }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/monitoring/accesslog/AccessLogWriter.kt

@@ -20,7 +20,9 @@ import io.emeraldpay.dshackle.config.MainConfig
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Repository
-import java.io.*
+import java.io.BufferedOutputStream
+import java.io.File
+import java.io.FileOutputStream
 import java.time.Duration
 import java.time.Instant
 import java.util.concurrent.ConcurrentLinkedQueue
@@ -30,7 +32,7 @@ import javax.annotation.PostConstruct
 
 @Repository
 class AccessLogWriter(
-        @Autowired mainConfig: MainConfig
+    @Autowired mainConfig: MainConfig
 ) {
 
     companion object {
@@ -120,5 +122,4 @@ class AccessLogWriter(
             }
         }
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/monitoring/accesslog/Events.kt

@@ -19,7 +19,7 @@ import com.fasterxml.jackson.annotation.JsonInclude
 import io.emeraldpay.grpc.Chain
 import org.slf4j.LoggerFactory
 import java.time.Instant
-import java.util.*
+import java.util.UUID
 
 class Events {
 
@@ -32,140 +32,152 @@ class Events {
     }
 
     abstract class Base(
-            val id: UUID,
-            val method: String,
-            val channel: Channel
+        val id: UUID,
+        val method: String,
+        val channel: Channel
     ) {
         val version = "accesslog/v1beta"
         var ts = Instant.now()
     }
 
     abstract class ChainBase(
-            val blockchain: Chain, method: String, id: UUID, channel: Channel
+        val blockchain: Chain,
+        method: String,
+        id: UUID,
+        channel: Channel
     ) : Base(id, method, channel)
 
     @JsonInclude(JsonInclude.Include.NON_NULL)
     class SubscribeHead(
-            blockchain: Chain, id: UUID,
-            // initial request details
-            val request: StreamRequestDetails,
-            // index of the current response
-            val index: Int
+        blockchain: Chain,
+        id: UUID,
+        // initial request details
+        val request: StreamRequestDetails,
+        // index of the current response
+        val index: Int
     ) : ChainBase(blockchain, "SubscribeHead", id, Channel.GRPC)
 
     @JsonInclude(JsonInclude.Include.NON_NULL)
     class SubscribeBalance(
-            blockchain: Chain, id: UUID, subscribe: Boolean,
-            // initial request details
-            val request: StreamRequestDetails,
-            val balanceRequest: BalanceRequest,
-            val addressBalance: AddressBalance,
-            // index of the current response
-            val index: Int
+        blockchain: Chain,
+        id: UUID,
+        subscribe: Boolean,
+        // initial request details
+        val request: StreamRequestDetails,
+        val balanceRequest: BalanceRequest,
+        val addressBalance: AddressBalance,
+        // index of the current response
+        val index: Int
     ) : ChainBase(blockchain, if (subscribe) "SubscribeBalance" else "GetBalance", id, Channel.GRPC)
 
     @JsonInclude(JsonInclude.Include.NON_NULL)
     class TxStatus(
-            blockchain: Chain, id: UUID,
-            val request: StreamRequestDetails,
-            val txStatusRequest: TxStatusRequest,
-            val txStatus: TxStatusResponse,
-            // index of the current response
-            val index: Int
+        blockchain: Chain,
+        id: UUID,
+        val request: StreamRequestDetails,
+        val txStatusRequest: TxStatusRequest,
+        val txStatus: TxStatusResponse,
+        // index of the current response
+        val index: Int
     ) : ChainBase(blockchain, "SubscribeTxStatus", id, Channel.GRPC)
 
     data class TxStatusRequest(
-            val txId: String
+        val txId: String
     )
 
     data class TxStatusResponse(
-            val confirmations: Int
+        val confirmations: Int
     )
 
     @JsonInclude(JsonInclude.Include.NON_NULL)
     class NativeCall(
-            blockchain: Chain, id: UUID, channel: Channel,
+        blockchain: Chain,
+        id: UUID,
+        channel: Channel,
 
-            // info about the initial request, that may include several native calls
-            val request: StreamRequestDetails,
-            // total native calls passes within the initial request
-            val total: Int,
-            // index of the call specific for the current response
-            val index: Int,
-            val selector: String? = null,
-            val quorum: Long? = null,
-            val minAvailability: String? = null,
+        // info about the initial request, that may include several native calls
+        val request: StreamRequestDetails,
+        // total native calls passes within the initial request
+        val total: Int,
+        // index of the call specific for the current response
+        val index: Int,
+        val selector: String? = null,
+        val quorum: Long? = null,
+        val minAvailability: String? = null,
 
-            val succeed: Boolean,
-            val rpcError: Int? = null,
-            val payloadSizeBytes: Long,
-            val nativeCall: NativeCallItemDetails
+        val succeed: Boolean,
+        val rpcError: Int? = null,
+        val payloadSizeBytes: Long,
+        val nativeCall: NativeCallItemDetails
     ) : ChainBase(blockchain, "NativeCall", id, channel)
 
     @JsonInclude(JsonInclude.Include.NON_NULL)
     class NativeSubscribe(
-            blockchain: Chain, id: UUID, channel: Channel,
+        blockchain: Chain,
+        id: UUID,
+        channel: Channel,
 
-            // info about the initial request, that may include several native calls
-            val request: StreamRequestDetails,
-            val payloadSizeBytes: Long,
-            val nativeSubscribe: NativeSubscribeItemDetails
+        // info about the initial request, that may include several native calls
+        val request: StreamRequestDetails,
+        val payloadSizeBytes: Long,
+        val nativeSubscribe: NativeSubscribeItemDetails
     ) : ChainBase(blockchain, "NativeSubscribe", id, channel)
 
     @JsonInclude(JsonInclude.Include.NON_NULL)
     class Describe(
-            id: UUID,
-            val request: StreamRequestDetails
+        id: UUID,
+        val request: StreamRequestDetails
     ) : Base(id, "Describe", Channel.GRPC)
 
     @JsonInclude(JsonInclude.Include.NON_NULL)
     class Status(
-            blockchain: Chain, id: UUID,
-            val request: StreamRequestDetails
+        blockchain: Chain,
+        id: UUID,
+        val request: StreamRequestDetails
     ) : ChainBase(blockchain, "Status", id, Channel.GRPC)
 
     data class StreamRequestDetails(
-            val id: UUID,
-            val start: Instant,
-            val remote: Remote
+        val id: UUID,
+        val start: Instant,
+        val remote: Remote
     )
 
     data class Remote(
-            val ips: List<String>,
-            val ip: String,
-            val userAgent: String
+        val ips: List<String>,
+        val ip: String,
+        val userAgent: String
     )
 
     data class NativeCallItemDetails(
-            val method: String,
-            val id: Int,
-            val payloadSizeBytes: Long
+        val method: String,
+        val id: Int,
+        val payloadSizeBytes: Long
     )
 
     data class NativeCallReplyDetails(
-            val id: Int,
-            val succeed: Boolean,
-            val replySizeBytes: Long,
-            val ts: Instant = Instant.now()
+        val id: Int,
+        val succeed: Boolean,
+        val replySizeBytes: Long,
+        val ts: Instant = Instant.now()
     )
 
     data class NativeSubscribeItemDetails(
-            val method: String,
-            val payloadSizeBytes: Long
+        val method: String,
+        val payloadSizeBytes: Long
     )
 
     data class NativeSubscribeReplyDetails(
-            val replySizeBytes: Long,
-            val ts: Instant = Instant.now()
+        val replySizeBytes: Long,
+        val ts: Instant = Instant.now()
     )
 
     data class BalanceRequest(
-            val asset: String,
-            val addressType: String
+        val asset: String,
+        val addressType: String
     )
 
     data class AddressBalance(
-            val asset: String,
-            val address: String
+        val asset: String,
+        val address: String
     )
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/monitoring/accesslog/EventsBuilder.kt

@@ -27,7 +27,8 @@ import reactor.netty.http.server.HttpServerRequest
 import java.net.InetAddress
 import java.net.InetSocketAddress
 import java.time.Instant
-import java.util.*
+import java.util.Locale
+import java.util.UUID
 
 class EventsBuilder {
 
@@ -48,23 +49,23 @@ class EventsBuilder {
         fun onReply(msg: Resp): E
     }
 
-    abstract class Base<T>() : StartingHttp2Request, StartingHttp1Request {
+    abstract class Base<T> : StartingHttp2Request, StartingHttp1Request {
         companion object {
             private val remoteIpHeaders = listOf(
-                    "x-real-ip",
-                    "x-forwarded-for"
+                "x-real-ip",
+                "x-forwarded-for"
             )
             private val remoteIpKeys = listOf(
-                    Metadata.Key.of("x-real-ip", Metadata.ASCII_STRING_MARSHALLER),
-                    Metadata.Key.of("x-forwarded-for", Metadata.ASCII_STRING_MARSHALLER)
+                Metadata.Key.of("x-real-ip", Metadata.ASCII_STRING_MARSHALLER),
+                Metadata.Key.of("x-forwarded-for", Metadata.ASCII_STRING_MARSHALLER)
             )
             private val invalidCharacters = Regex("[\n\t]+")
         }
 
         var requestDetails = Events.StreamRequestDetails(
-                UUID.randomUUID(),
-                Instant.now(),
-                Events.Remote(emptyList(), "", "")
+            UUID.randomUUID(),
+            Instant.now(),
+            Events.Remote(emptyList(), "", "")
         )
 
         var chainId: Int = Chain.UNSPECIFIED.id
@@ -84,35 +85,37 @@ class EventsBuilder {
 
         private fun findBestIp(ips: List<InetAddress>): InetAddress? {
             // check if a real remote address is provided, otherwise use any local address
-            return ips.sortedWith(kotlin.Comparator { a, b ->
-                val aLocal = a.isLoopbackAddress || a.isSiteLocalAddress
-                val bLocal = b.isLoopbackAddress || b.isSiteLocalAddress
-                when {
-                    aLocal && bLocal -> 0
-                    aLocal -> 1
-                    else -> -1
+            return ips.sortedWith(
+                kotlin.Comparator { a, b ->
+                    val aLocal = a.isLoopbackAddress || a.isSiteLocalAddress
+                    val bLocal = b.isLoopbackAddress || b.isSiteLocalAddress
+                    when {
+                        aLocal && bLocal -> 0
+                        aLocal -> 1
+                        else -> -1
+                    }
                 }
-            }).firstOrNull()
+            ).firstOrNull()
         }
 
         private fun clean(s: String): String {
             return StringUtils.truncate(s, 128)
-                    .replace(invalidCharacters, " ")
-                    .trim()
+                .replace(invalidCharacters, " ")
+                .trim()
         }
 
         protected abstract fun getT(): T
 
         override fun start(metadata: Metadata, attributes: Attributes) {
             val userAgent = metadata.get(Metadata.Key.of("user-agent", Metadata.ASCII_STRING_MARSHALLER))
-                    ?.let(this@Base::clean)
-                    ?: ""
+                ?.let(this@Base::clean)
+                ?: ""
             val ips = ArrayList<InetAddress>()
             remoteIpKeys.forEach { key ->
                 metadata.get(key)?.let {
                     it.trim().ifEmpty { null }
-                            ?.let(this@Base::toInetAddress)
-                            ?.let(ips::add)
+                        ?.let(this@Base::toInetAddress)
+                        ?.let(ips::add)
                 }
             }
             attributes.get(Grpc.TRANSPORT_ATTR_REMOTE_ADDR)?.let { addr ->
@@ -122,24 +125,26 @@ class EventsBuilder {
             }
             val ip = findBestIp(ips)?.hostAddress ?: ""
             this.requestDetails = this.requestDetails
-                    .copy(remote = Events.Remote(
-                            ips = ips.map { it.hostAddress },
-                            ip = ip,
-                            userAgent = userAgent
-                    ))
+                .copy(
+                    remote = Events.Remote(
+                        ips = ips.map { it.hostAddress },
+                        ip = ip,
+                        userAgent = userAgent
+                    )
+                )
         }
 
         override fun start(request: HttpServerRequest) {
             val headers = request.requestHeaders()
             val userAgent = headers.get("user-agent")
-                    ?.let(this@Base::clean)
-                    ?: ""
+                ?.let(this@Base::clean)
+                ?: ""
             val ips = ArrayList<InetAddress>()
             remoteIpHeaders.forEach { key ->
                 headers.get(key)?.let {
                     it.trim().ifEmpty { null }
-                            ?.let(this@Base::toInetAddress)
-                            ?.let(ips::add)
+                        ?.let(this@Base::toInetAddress)
+                        ?.let(ips::add)
                 }
             }
             request.remoteAddress()?.let { addr ->
@@ -147,11 +152,13 @@ class EventsBuilder {
             }
             val ip = findBestIp(ips)?.hostAddress ?: ""
             this.requestDetails = this.requestDetails
-                    .copy(remote = Events.Remote(
-                            ips = ips.map { it.hostAddress },
-                            ip = ip,
-                            userAgent = userAgent
-                    ))
+                .copy(
+                    remote = Events.Remote(
+                        ips = ips.map { it.hostAddress },
+                        ip = ip,
+                        userAgent = userAgent
+                    )
+                )
         }
 
         fun withChain(chain: Int): T {
@@ -161,9 +168,9 @@ class EventsBuilder {
         }
     }
 
-    class SubscribeHead() :
-            Base<SubscribeHead>(),
-            RequestReply<Events.SubscribeHead, Common.Chain, BlockchainOuterClass.ChainHead> {
+    class SubscribeHead :
+        Base<SubscribeHead>(),
+        RequestReply<Events.SubscribeHead, Common.Chain, BlockchainOuterClass.ChainHead> {
 
         private var index = 0
 
@@ -177,14 +184,14 @@ class EventsBuilder {
 
         override fun onReply(msg: BlockchainOuterClass.ChainHead): Events.SubscribeHead {
             return Events.SubscribeHead(
-                    chain, UUID.randomUUID(), requestDetails, index++
+                chain, UUID.randomUUID(), requestDetails, index++
             )
         }
     }
 
     class SubscribeBalance(val subscribe: Boolean) :
-            Base<SubscribeBalance>(),
-            RequestReply<Events.SubscribeBalance, BlockchainOuterClass.BalanceRequest, BlockchainOuterClass.AddressBalance> {
+        Base<SubscribeBalance>(),
+        RequestReply<Events.SubscribeBalance, BlockchainOuterClass.BalanceRequest, BlockchainOuterClass.AddressBalance> {
 
         private var index = 0
         private var balanceRequest: Events.BalanceRequest? = null
@@ -195,8 +202,8 @@ class EventsBuilder {
 
         override fun onRequest(msg: BlockchainOuterClass.BalanceRequest) {
             balanceRequest = Events.BalanceRequest(
-                    msg.asset.code.uppercase(Locale.getDefault()),
-                    msg.address.addrTypeCase.name
+                msg.asset.code.uppercase(Locale.getDefault()),
+                msg.address.addrTypeCase.name
             )
         }
 
@@ -207,14 +214,14 @@ class EventsBuilder {
             val addressBalance = Events.AddressBalance(msg.asset.code, msg.address.address)
             val chain = Chain.byId(msg.asset.chain.number)
             return Events.SubscribeBalance(
-                    chain, UUID.randomUUID(), subscribe, requestDetails, balanceRequest!!, addressBalance, index++
+                chain, UUID.randomUUID(), subscribe, requestDetails, balanceRequest!!, addressBalance, index++
             )
         }
     }
 
-    class TxStatus() :
-            Base<TxStatus>(),
-            RequestReply<Events.TxStatus, BlockchainOuterClass.TxStatusRequest, BlockchainOuterClass.TxStatus> {
+    class TxStatus :
+        Base<TxStatus>(),
+        RequestReply<Events.TxStatus, BlockchainOuterClass.TxStatusRequest, BlockchainOuterClass.TxStatus> {
         private var index = 0
         private var txStatusRequest: Events.TxStatusRequest? = null
 
@@ -225,21 +232,20 @@ class EventsBuilder {
 
         override fun onReply(msg: BlockchainOuterClass.TxStatus): Events.TxStatus {
             return Events.TxStatus(
-                    chain, UUID.randomUUID(), requestDetails, txStatusRequest!!,
-                    Events.TxStatusResponse(msg.confirmations),
-                    index++
+                chain, UUID.randomUUID(), requestDetails, txStatusRequest!!,
+                Events.TxStatusResponse(msg.confirmations),
+                index++
             )
         }
 
         override fun getT(): TxStatus {
             return this
         }
-
     }
 
     class NativeCall :
-            Base<NativeCall>(),
-            RequestReply<Events.NativeCall, BlockchainOuterClass.NativeCallRequest, BlockchainOuterClass.NativeCallReplyItem> {
+        Base<NativeCall>(),
+        RequestReply<Events.NativeCall, BlockchainOuterClass.NativeCallRequest, BlockchainOuterClass.NativeCallReplyItem> {
         val items = ArrayList<Events.NativeCallItemDetails>()
         val replies = HashMap<Int, Events.NativeCallReplyDetails>()
         private var index = 0
@@ -252,11 +258,11 @@ class EventsBuilder {
             withChain(msg.chain.number)
             msg.itemsList.forEach { item ->
                 this.items.add(
-                        Events.NativeCallItemDetails(
-                                item.method,
-                                item.id,
-                                item.payload.size().toLong()
-                        )
+                    Events.NativeCallItemDetails(
+                        item.method,
+                        item.id,
+                        item.payload.size().toLong()
+                    )
                 )
             }
         }
@@ -264,38 +270,40 @@ class EventsBuilder {
         override fun onReply(msg: BlockchainOuterClass.NativeCallReplyItem): Events.NativeCall {
             val item = items.find { it.id == msg.id }!!
             return Events.NativeCall(
-                    request = requestDetails,
-                    total = items.size,
-                    index = index++,
-                    succeed = msg.succeed,
-                    blockchain = chain,
-                    nativeCall = item,
-                    payloadSizeBytes = item.payloadSizeBytes,
-                    id = UUID.randomUUID(),
-                    channel = Events.Channel.GRPC
+                request = requestDetails,
+                total = items.size,
+                index = index++,
+                succeed = msg.succeed,
+                blockchain = chain,
+                nativeCall = item,
+                payloadSizeBytes = item.payloadSizeBytes,
+                id = UUID.randomUUID(),
+                channel = Events.Channel.GRPC
             )
         }
 
-        fun onReply(reply: io.emeraldpay.dshackle.rpc.NativeCall.CallResult,
-                    channel: Events.Channel): Events.NativeCall {
+        fun onReply(
+            reply: io.emeraldpay.dshackle.rpc.NativeCall.CallResult,
+            channel: Events.Channel
+        ): Events.NativeCall {
             val item = items.find { it.id == reply.id }!!
             return Events.NativeCall(
-                    request = requestDetails,
-                    total = items.size,
-                    index = index++,
-                    succeed = !reply.isError(),
-                    blockchain = chain,
-                    nativeCall = item,
-                    payloadSizeBytes = item.payloadSizeBytes,
-                    id = UUID.randomUUID(),
-                    channel = channel
+                request = requestDetails,
+                total = items.size,
+                index = index++,
+                succeed = !reply.isError(),
+                blockchain = chain,
+                nativeCall = item,
+                payloadSizeBytes = item.payloadSizeBytes,
+                id = UUID.randomUUID(),
+                channel = channel
             )
         }
     }
 
     class NativeSubscribe :
-            Base<NativeSubscribe>(),
-            RequestReply<Events.NativeSubscribe, BlockchainOuterClass.NativeSubscribeRequest, BlockchainOuterClass.NativeSubscribeReplyItem> {
+        Base<NativeSubscribe>(),
+        RequestReply<Events.NativeSubscribe, BlockchainOuterClass.NativeSubscribeRequest, BlockchainOuterClass.NativeSubscribeReplyItem> {
         var item: Events.NativeSubscribeItemDetails? = null
         val replies = HashMap<Int, Events.NativeSubscribeReplyDetails>()
 
@@ -306,26 +314,26 @@ class EventsBuilder {
         override fun onRequest(msg: BlockchainOuterClass.NativeSubscribeRequest) {
             withChain(msg.chain.number)
             this.item = Events.NativeSubscribeItemDetails(
-                    msg.method,
-                    msg.payload.size().toLong()
+                msg.method,
+                msg.payload.size().toLong()
             )
         }
 
         override fun onReply(msg: BlockchainOuterClass.NativeSubscribeReplyItem): Events.NativeSubscribe {
             return Events.NativeSubscribe(
-                    request = requestDetails,
-                    blockchain = chain,
-                    nativeSubscribe = item!!,
-                    payloadSizeBytes = msg.payload?.size()?.toLong() ?: 0L,
-                    id = UUID.randomUUID(),
-                    channel = Events.Channel.GRPC
+                request = requestDetails,
+                blockchain = chain,
+                nativeSubscribe = item!!,
+                payloadSizeBytes = msg.payload?.size()?.toLong() ?: 0L,
+                id = UUID.randomUUID(),
+                channel = Events.Channel.GRPC
             )
         }
     }
 
     class Describe :
-            Base<Describe>(),
-            RequestReply<Events.Describe, BlockchainOuterClass.DescribeRequest, BlockchainOuterClass.DescribeResponse> {
+        Base<Describe>(),
+        RequestReply<Events.Describe, BlockchainOuterClass.DescribeRequest, BlockchainOuterClass.DescribeResponse> {
 
         override fun getT(): Describe {
             return this
@@ -336,15 +344,15 @@ class EventsBuilder {
 
         override fun onReply(msg: BlockchainOuterClass.DescribeResponse): Events.Describe {
             return Events.Describe(
-                    id = UUID.randomUUID(),
-                    request = requestDetails
+                id = UUID.randomUUID(),
+                request = requestDetails
             )
         }
     }
 
     class Status :
-            Base<Status>(),
-            RequestReply<Events.Status, BlockchainOuterClass.StatusRequest, BlockchainOuterClass.ChainStatus> {
+        Base<Status>(),
+        RequestReply<Events.Status, BlockchainOuterClass.StatusRequest, BlockchainOuterClass.ChainStatus> {
         override fun getT(): Status {
             return this
         }
@@ -355,11 +363,10 @@ class EventsBuilder {
         override fun onReply(msg: BlockchainOuterClass.ChainStatus): Events.Status {
             val chain = Chain.byId(msg.chainValue)
             return Events.Status(
-                    blockchain = chain,
-                    request = requestDetails,
-                    id = UUID.randomUUID()
+                blockchain = chain,
+                request = requestDetails,
+                id = UUID.randomUUID()
             )
         }
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/proxy/ProxyCall.kt

@@ -23,10 +23,10 @@ import org.slf4j.LoggerFactory
  * JSON RPC call to the proxy
  */
 class ProxyCall(
-        /**
-         * Type of the request. The response format depends on it
-         */
-        val type: RpcType
+    /**
+     * Type of the request. The response format depends on it
+     */
+    val type: RpcType
 ) {
 
     companion object {
@@ -55,4 +55,4 @@ class ProxyCall(
          */
         BATCH
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/proxy/ProxyServer.kt

@@ -24,8 +24,8 @@ import io.emeraldpay.dshackle.config.ProxyConfig
 import io.emeraldpay.dshackle.monitoring.accesslog.AccessHandlerHttp
 import io.emeraldpay.dshackle.rpc.NativeCall
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcResponse
-import io.emeraldpay.grpc.Chain
 import io.emeraldpay.etherjar.rpc.RpcException
+import io.emeraldpay.grpc.Chain
 import io.micrometer.core.instrument.Counter
 import io.micrometer.core.instrument.Metrics
 import io.micrometer.core.instrument.Timer
@@ -38,16 +38,14 @@ import org.slf4j.LoggerFactory
 import org.springframework.http.HttpHeaders
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
-import reactor.netty.DisposableServer
 import reactor.netty.http.server.HttpServer
 import reactor.netty.http.server.HttpServerRequest
 import reactor.netty.http.server.HttpServerResponse
 import reactor.netty.http.server.HttpServerRoutes
-import java.util.*
+import java.util.EnumMap
 import java.util.concurrent.TimeUnit
 import java.util.concurrent.locks.ReentrantReadWriteLock
 import java.util.function.BiFunction
-import kotlin.collections.HashMap
 import kotlin.concurrent.read
 import kotlin.concurrent.write
 
@@ -55,12 +53,12 @@ import kotlin.concurrent.write
  * HTTP Proxy Server
  */
 class ProxyServer(
-        private var config: ProxyConfig,
-        private val readRpcJson: ReadRpcJson,
-        private val writeRpcJson: WriteRpcJson,
-        private val nativeCall: NativeCall,
-        private val tlsSetup: TlsSetup,
-        private val accessHandler: AccessHandlerHttp.HandlerFactory
+    private var config: ProxyConfig,
+    private val readRpcJson: ReadRpcJson,
+    private val writeRpcJson: WriteRpcJson,
+    private val nativeCall: NativeCall,
+    private val tlsSetup: TlsSetup,
+    private val accessHandler: AccessHandlerHttp.HandlerFactory
 ) {
 
     companion object {
@@ -101,19 +99,19 @@ class ProxyServer(
         }
         log.info("Listening Proxy on ${config.host}:${config.port}")
         var serverBuilder = HttpServer.create()
-                .doOnChannelInit { _, channel, _ ->
-                    channel.pipeline().addFirst(errorHandler)
-                }
-                .host(config.host)
-                .port(config.port)
+            .doOnChannelInit { _, channel, _ ->
+                channel.pipeline().addFirst(errorHandler)
+            }
+            .host(config.host)
+            .port(config.port)
 
         tlsSetup.setupServer("proxy", config.tls, false)?.let { sslContext ->
             serverBuilder = serverBuilder.secure { secure -> secure.sslContext(sslContext) }
         }
 
         serverBuilder
-                .route(this::setupRoutes)
-                .bindNow()
+            .route(this::setupRoutes)
+            .bindNow()
     }
 
     fun setupRoutes(routes: HttpServerRoutes) {
@@ -139,26 +137,26 @@ class ProxyServer(
             }
         }
         val request = BlockchainOuterClass.NativeCallRequest.newBuilder()
-                .setChain(Common.ChainRef.forNumber(chain.id))
-                .addAllItems(call.items)
-                .build()
+            .setChain(Common.ChainRef.forNumber(chain.id))
+            .addAllItems(call.items)
+            .build()
         handler.onRequest(request)
         val jsons = nativeCall
-                .nativeCallResult(Mono.just(request))
-                .doOnNext {
-                    metricById(it.id)?.requestMetric?.increment()
+            .nativeCallResult(Mono.just(request))
+            .doOnNext {
+                metricById(it.id)?.requestMetric?.increment()
+            }
+            .doOnNext {
+                handler.onResponse(it)
+                metricById(it.id)?.callMetric?.record(System.currentTimeMillis() - startTime, TimeUnit.MILLISECONDS)
+            }
+            .doOnError {
+                // when error happened the whole flux is stopped and no result is produced, so we should mark all the requests as failed
+                call.items.forEach { item ->
+                    requestMetrics.get(chain, item.method).errorMetric.increment()
                 }
-                .doOnNext {
-                    handler.onResponse(it)
-                    metricById(it.id)?.callMetric?.record(System.currentTimeMillis() - startTime, TimeUnit.MILLISECONDS)
-                }
-                .doOnError {
-                    //when error happened the whole flux is stopped and no result is produced, so we should mark all the requests as failed
-                    call.items.forEach { item ->
-                        requestMetrics.get(chain, item.method).errorMetric.increment()
-                    }
-                }
-                .transform(writeRpcJson.toJsons(call))
+            }
+            .transform(writeRpcJson.toJsons(call))
         return if (call.type == ProxyCall.RpcType.SINGLE) {
             jsons.next()
         } else {
@@ -166,21 +164,25 @@ class ProxyServer(
         }
     }
 
-    fun processRequest(chain: Chain, request: Mono<ByteArray>, handler: AccessHandlerHttp.RequestHandler): Flux<ByteBuf> {
+    fun processRequest(
+        chain: Chain,
+        request: Mono<ByteArray>,
+        handler: AccessHandlerHttp.RequestHandler
+    ): Flux<ByteBuf> {
         return request
-                .map(readRpcJson)
-                .flatMapMany { call -> 
-                    execute(chain, call, handler) 
-                }
-                .onErrorResume(RpcException::class.java) { err ->
-                    val id = err.details?.let {
-                        if (it is JsonRpcResponse.Id) it else JsonRpcResponse.NumberId(-1)
-                    } ?: JsonRpcResponse.NumberId(-1)
+            .map(readRpcJson)
+            .flatMapMany { call ->
+                execute(chain, call, handler)
+            }
+            .onErrorResume(RpcException::class.java) { err ->
+                val id = err.details?.let {
+                    if (it is JsonRpcResponse.Id) it else JsonRpcResponse.NumberId(-1)
+                } ?: JsonRpcResponse.NumberId(-1)
 
-                    val json = JsonRpcResponse.error(err.code, err.rpcMessage, id)
-                    Mono.just(Global.objectMapper.writeValueAsString(json))
-                }
-                .map { Unpooled.wrappedBuffer(it.toByteArray()) }
+                val json = JsonRpcResponse.error(err.code, err.rpcMessage, id)
+                Mono.just(Global.objectMapper.writeValueAsString(json))
+            }
+            .map { Unpooled.wrappedBuffer(it.toByteArray()) }
     }
 
     fun proxy(routeConfig: ProxyConfig.Route): BiFunction<HttpServerRequest, HttpServerResponse, Publisher<Void>> {
@@ -188,13 +190,13 @@ class ProxyServer(
             // handle access events
             val eventHandler = accessHandler.create(req, routeConfig.blockchain)
             val request = req.receive()
-                    .aggregate()
-                    .asByteArray()
+                .aggregate()
+                .asByteArray()
             val results = processRequest(routeConfig.blockchain, request, eventHandler)
-                    // make sure that the access log handler is closed at the end, so it can render the logs
-                    .doFinally { eventHandler.close() }
+                // make sure that the access log handler is closed at the end, so it can render the logs
+                .doFinally { eventHandler.close() }
             resp.addHeader(HttpHeaders.CONTENT_TYPE, "application/json")
-                    .send(results)
+                .send(results)
         }
     }
 
@@ -251,25 +253,25 @@ class ProxyServer(
 
     class RequestMetricsBasic(chain: Chain) : RequestMetrics {
         override val callMetric = Timer.builder("request.jsonrpc.call")
-                .tags("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tags("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
         override val errorMetric = Counter.builder("request.jsonrpc.err")
-                .tags("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tags("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
         override val requestMetric = Counter.builder("request.jsonrpc.request.total")
-                .tags("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tags("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
     }
 
     class RequestMetricsWithMethod(chain: Chain, method: String) : RequestMetrics {
         override val callMetric = Timer.builder("request.jsonrpc.call")
-                .tags("chain", chain.chainCode, "method", method)
-                .register(Metrics.globalRegistry)
+            .tags("chain", chain.chainCode, "method", method)
+            .register(Metrics.globalRegistry)
         override val errorMetric = Counter.builder("request.jsonrpc.err")
-                .tags("chain", chain.chainCode, "method", method)
-                .register(Metrics.globalRegistry)
+            .tags("chain", chain.chainCode, "method", method)
+            .register(Metrics.globalRegistry)
         override val requestMetric = Counter.builder("request.jsonrpc.request.total")
-                .tags("chain", chain.chainCode, "method", method)
-                .register(Metrics.globalRegistry)
+            .tags("chain", chain.chainCode, "method", method)
+            .register(Metrics.globalRegistry)
     }
 }

src/main/kotlin/io/emeraldpay/dshackle/proxy/ReadRpcJson.kt

@@ -25,19 +25,16 @@ import io.emeraldpay.etherjar.rpc.RpcException
 import io.emeraldpay.etherjar.rpc.RpcResponseError
 import io.emeraldpay.etherjar.rpc.json.RequestJson
 import org.slf4j.LoggerFactory
-import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Service
 import java.io.IOException
-import java.util.*
 import java.util.function.Function
 import java.util.stream.Collectors
 
-
 /**
  * Reader for JSON RPC request
  */
 @Service
-open class ReadRpcJson() : Function<ByteArray, ProxyCall> {
+open class ReadRpcJson : Function<ByteArray, ProxyCall> {
 
     companion object {
         private val log = LoggerFactory.getLogger(ReadRpcJson::class.java)
@@ -55,21 +52,37 @@ open class ReadRpcJson() : Function<ByteArray, ProxyCall> {
             val id = json["id"]
             if ("2.0" != json["jsonrpc"]) {
                 if (json["jsonrpc"] == null) {
-                    throw RpcException(RpcResponseError.CODE_INVALID_REQUEST, "jsonrpc version is not set", id?.let { JsonRpcResponse.Id.from(it) })
+                    throw RpcException(
+                        RpcResponseError.CODE_INVALID_REQUEST,
+                        "jsonrpc version is not set",
+                        id?.let { JsonRpcResponse.Id.from(it) }
+                    )
                 }
-                throw RpcException(RpcResponseError.CODE_INVALID_REQUEST, "Unsupported JSON RPC version: " + json["jsonrpc"].toString(), id?.let { JsonRpcResponse.Id.from(it) })
+                throw RpcException(
+                    RpcResponseError.CODE_INVALID_REQUEST,
+                    "Unsupported JSON RPC version: " + json["jsonrpc"].toString(),
+                    id?.let { JsonRpcResponse.Id.from(it) }
+                )
             }
             if (!(json["method"] != null && json["method"] is String)) {
-                throw RpcException(RpcResponseError.CODE_INVALID_REQUEST, "Method is not set", id?.let { JsonRpcResponse.Id.from(it) })
+                throw RpcException(
+                    RpcResponseError.CODE_INVALID_REQUEST,
+                    "Method is not set",
+                    id?.let { JsonRpcResponse.Id.from(it) }
+                )
             }
             if (json.containsKey("params") && json["params"] !is List<*>) {
-                throw RpcException(RpcResponseError.CODE_INVALID_REQUEST, "Params must be an array", id?.let { JsonRpcResponse.Id.from(it) })
+                throw RpcException(
+                    RpcResponseError.CODE_INVALID_REQUEST,
+                    "Params must be an array",
+                    id?.let { JsonRpcResponse.Id.from(it) }
+                )
             }
             RequestJson<Any>(
-                    json["method"].toString(),
-                    //params MAY be omitted
-                    (json["params"] ?: emptyList<Any>()) as List<*>,
-                    id
+                json["method"].toString(),
+                // params MAY be omitted
+                (json["params"] ?: emptyList<Any>()) as List<*>,
+                id
             )
         }
     }
@@ -81,7 +94,7 @@ open class ReadRpcJson() : Function<ByteArray, ProxyCall> {
     fun getStartOfJson(buf: ByteArray): Byte {
         val count = buf.size
         var i = 0
-        //if cannot find anything in the first 255 bytes, just consider it as invalid
+        // if cannot find anything in the first 255 bytes, just consider it as invalid
         while (i < 256 && i < count) {
             if (buf[i] != spaces[0] && buf[i] != spaces[1] && buf[i] != spaces[2]) {
                 return buf[i]
@@ -127,17 +140,17 @@ open class ReadRpcJson() : Function<ByteArray, ProxyCall> {
             // our internal ids for calls
             var seq = 0
             val batch = list.stream()
-                    .map<RequestJson<Any>>(jsonExtractor)
-                    .map { json ->
-                        val id = seq++
-                        context.ids[id] = json.id
-                        BlockchainOuterClass.NativeCallItem.newBuilder()
-                                .setId(id)
-                                .setMethod(json.method)
-                                .setPayload(ByteString.copyFrom(objectMapper.writeValueAsBytes(json.params)))
-                                .build()
-                    }
-                    .collect(Collectors.toList())
+                .map<RequestJson<Any>>(jsonExtractor)
+                .map { json ->
+                    val id = seq++
+                    context.ids[id] = json.id
+                    BlockchainOuterClass.NativeCallItem.newBuilder()
+                        .setId(id)
+                        .setMethod(json.method)
+                        .setPayload(ByteString.copyFrom(objectMapper.writeValueAsBytes(json.params)))
+                        .build()
+                }
+                .collect(Collectors.toList())
             context.items.addAll(batch)
             return context
         } catch (e: RpcException) {
@@ -147,5 +160,4 @@ open class ReadRpcJson() : Function<ByteArray, ProxyCall> {
             throw RpcException(RpcResponseError.CODE_INVALID_JSON, e.message)
         }
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/proxy/WriteRpcJson.kt

@@ -17,7 +17,6 @@
 package io.emeraldpay.dshackle.proxy
 
 import com.fasterxml.jackson.databind.ObjectMapper
-import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.dshackle.Global
 import io.emeraldpay.dshackle.rpc.NativeCall
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcResponse
@@ -31,7 +30,7 @@ import java.util.function.Function
  * Writer for JSON RPC requests
  */
 @Service
-open class WriteRpcJson() {
+open class WriteRpcJson {
 
     companion object {
         private val log = LoggerFactory.getLogger(WriteRpcJson::class.java)
@@ -45,35 +44,35 @@ open class WriteRpcJson() {
     open fun toJsons(call: ProxyCall): Function<Flux<NativeCall.CallResult>, Flux<String>> {
         return Function { flux ->
             flux
-                    .flatMap { response ->
-                        if (!call.ids.containsKey(response.id)) {
-                            log.warn("ID wasn't requested: ${response.id}")
-                            return@flatMap Flux.empty<String>()
-                        }
-                        val json = toJson(call, response)
-                        if (json == null) {
-                            Flux.empty<String>()
-                        } else {
-                            Flux.just(json)
-                        }
+                .flatMap { response ->
+                    if (!call.ids.containsKey(response.id)) {
+                        log.warn("ID wasn't requested: ${response.id}")
+                        return@flatMap Flux.empty<String>()
                     }
-                    .onErrorResume { t ->
-                        if (t is NativeCall.CallFailure) {
-                            Mono.just(toJson(call, t)!!)
-                        } else {
-                            Mono.empty()
-                        }
+                    val json = toJson(call, response)
+                    if (json == null) {
+                        Flux.empty<String>()
+                    } else {
+                        Flux.just(json)
                     }
-                    .onErrorContinue { t, _ ->
-                        log.warn("Failed to convert to JSON", t)
+                }
+                .onErrorResume { t ->
+                    if (t is NativeCall.CallFailure) {
+                        Mono.just(toJson(call, t)!!)
+                    } else {
+                        Mono.empty()
                     }
+                }
+                .onErrorContinue { t, _ ->
+                    log.warn("Failed to convert to JSON", t)
+                }
         }
     }
 
     open fun toJson(call: ProxyCall, response: NativeCall.CallResult): String? {
         val id = call.ids[response.id]?.let {
             JsonRpcResponse.Id.from(it)
-        } ?: return null;
+        } ?: return null
         val json = if (response.isError()) {
             val error = response.error!!
             error.upstreamError?.let { upstreamError ->
@@ -86,7 +85,7 @@ open class WriteRpcJson() {
     }
 
     fun toJson(call: ProxyCall, error: NativeCall.CallFailure): String? {
-        val id = call.ids[error.id] ?: return null;
+        val id = call.ids[error.id] ?: return null
         val json = JsonRpcResponse.error(-32003, error.reason.message ?: "", JsonRpcResponse.Id.from(id))
         return objectMapper.writeValueAsString(json)
     }
@@ -97,18 +96,18 @@ open class WriteRpcJson() {
     fun asArray(): Function<Flux<String>, Flux<String>> {
         return Function { flux ->
             val body = flux.zipWith(Flux.concat(Mono.just(false), Flux.just(true).repeat()))
-                    .map {
-                        if (it.t2) {
-                            "," + it.t1
-                        } else {
-                            it.t1
-                        }
+                .map {
+                    if (it.t2) {
+                        "," + it.t1
+                    } else {
+                        it.t1
                     }
+                }
             Flux.concat(
-                    Mono.just("["),
-                    body,
-                    Mono.just("]")
+                Mono.just("["),
+                body,
+                Mono.just("]")
             )
         }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/quorum/AlwaysQuorum.kt

@@ -20,9 +20,8 @@ import io.emeraldpay.dshackle.upstream.Head
 import io.emeraldpay.dshackle.upstream.Upstream
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcError
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcException
-import io.emeraldpay.etherjar.rpc.RpcException
 
-open class AlwaysQuorum: CallQuorum {
+open class AlwaysQuorum : CallQuorum {
 
     private var resolved = false
     private var result: ByteArray? = null
@@ -60,4 +59,4 @@ open class AlwaysQuorum: CallQuorum {
     override fun toString(): String {
         return "Quorum: Accept Any"
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/quorum/BroadcastQuorum.kt

@@ -20,7 +20,7 @@ import io.emeraldpay.dshackle.upstream.Head
 import io.emeraldpay.dshackle.upstream.Upstream
 
 open class BroadcastQuorum(
-        val quorum: Int = 3
+    val quorum: Int = 3
 ) : CallQuorum, ValueAwareQuorum<String>(String::class.java) {
 
     private var result: ByteArray? = null
@@ -61,4 +61,4 @@ open class BroadcastQuorum(
     override fun toString(): String {
         return "Quorum: Broadcast to $quorum upstreams"
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/quorum/CallQuorum.kt

@@ -20,10 +20,6 @@ import io.emeraldpay.dshackle.upstream.Head
 import io.emeraldpay.dshackle.upstream.Upstream
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcError
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcException
-import io.emeraldpay.etherjar.domain.TransactionId
-import io.emeraldpay.etherjar.rpc.RpcException
-import io.emeraldpay.etherjar.rpc.json.BlockJson
-import io.emeraldpay.etherjar.rpc.json.TransactionRefJson
 import reactor.util.function.Tuple2
 import java.util.function.BiFunction
 import java.util.function.Predicate
@@ -54,4 +50,4 @@ interface CallQuorum {
             }
         }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/quorum/NonEmptyQuorum.kt

@@ -16,15 +16,11 @@
  */
 package io.emeraldpay.dshackle.quorum
 
-import com.fasterxml.jackson.databind.ObjectMapper
 import io.emeraldpay.dshackle.upstream.Head
 import io.emeraldpay.dshackle.upstream.Upstream
-import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcException
-import io.emeraldpay.etherjar.rpc.JacksonRpcConverter
-import io.emeraldpay.etherjar.rpc.RpcException
 
 open class NonEmptyQuorum(
-        val maxTries: Int = 3
+    val maxTries: Int = 3
 ) : CallQuorum, ValueAwareQuorum<Any>(Any::class.java) {
 
     private var result: ByteArray? = null
@@ -59,4 +55,4 @@ open class NonEmptyQuorum(
     override fun toString(): String {
         return "Quorum: Accept Non Error Result"
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/quorum/NonceQuorum.kt

@@ -16,17 +16,14 @@
  */
 package io.emeraldpay.dshackle.quorum
 
-import com.fasterxml.jackson.databind.ObjectMapper
 import io.emeraldpay.dshackle.upstream.Head
 import io.emeraldpay.dshackle.upstream.Upstream
 import io.emeraldpay.etherjar.hex.HexQuantity
-import io.emeraldpay.etherjar.rpc.JacksonRpcConverter
-import io.emeraldpay.etherjar.rpc.RpcException
 import java.util.concurrent.locks.ReentrantLock
 import kotlin.concurrent.withLock
 
 open class NonceQuorum(
-        val tries: Int = 3
+    val tries: Int = 3
 ) : CallQuorum, ValueAwareQuorum<String>(String::class.java) {
 
     private val lock = ReentrantLock()
@@ -74,4 +71,4 @@ open class NonceQuorum(
     override fun toString(): String {
         return "Quorum: Confirm with $tries upstreams"
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/quorum/NotLaggingQuorum.kt

@@ -20,7 +20,6 @@ import io.emeraldpay.dshackle.upstream.Head
 import io.emeraldpay.dshackle.upstream.Upstream
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcError
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcException
-import io.emeraldpay.etherjar.rpc.RpcException
 import java.util.concurrent.atomic.AtomicReference
 
 /**
@@ -28,7 +27,7 @@ import java.util.concurrent.atomic.AtomicReference
  *
  * NOTE: NativeCall checks the quorums and applies a HeightSelector if NotLaggingQuorum is enabled for a call
  */
-class NotLaggingQuorum(val maxLag: Long = 0): CallQuorum {
+class NotLaggingQuorum(val maxLag: Long = 0) : CallQuorum {
 
     private val result: AtomicReference<ByteArray> = AtomicReference()
     private val failed = AtomicReference(false)
@@ -73,4 +72,4 @@ class NotLaggingQuorum(val maxLag: Long = 0): CallQuorum {
     override fun toString(): String {
         return "Quorum: late <= $maxLag blocks"
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/quorum/QuorumReaderFactory.kt

@@ -35,4 +35,4 @@ interface QuorumReaderFactory {
             return QuorumRpcReader(apis, quorum)
         }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/quorum/QuorumRpcReader.kt

@@ -30,8 +30,8 @@ import reactor.util.function.Tuples
  * Makes request with applying Quorum
  */
 class QuorumRpcReader(
-        private val apis: ApiSource,
-        private val quorum: CallQuorum
+    private val apis: ApiSource,
+    private val quorum: CallQuorum
 ) : Reader<JsonRpcRequest, QuorumRpcReader.Result> {
 
     companion object {
@@ -58,8 +58,8 @@ class QuorumRpcReader(
         val defaultResult: Mono<Result> = Mono.just(quorum).flatMap { q ->
             if (q.isFailed()) {
                 Mono.error<Result>(
-                        q.getError()?.asException(JsonRpcResponse.NumberId(1))
-                                ?: RpcException(-32000, "Unknown Upstream error")
+                    q.getError()?.asException(JsonRpcResponse.NumberId(1))
+                        ?: RpcException(-32000, "Unknown Upstream error")
                 )
             } else {
                 log.warn("Did not get any result from upstream. Method [${key.method}] using [$q]")
@@ -68,72 +68,71 @@ class QuorumRpcReader(
         }
 
         return Flux.from(apis)
-                .takeUntil {
-                    quorum.isFailed() || quorum.isResolved()
-                }
-                .flatMap { api ->
-                    api.getApi()
-                            .read(key)
-                            .flatMap { response ->
-                                response.requireResult()
-                                        .onErrorResume { err ->
-                                            if (err is RpcException || err is JsonRpcException) {
-                                                // on error notify quorum, it may use error message or other details
-                                                val cleanErr: JsonRpcException = when (err) {
-                                                    is RpcException -> JsonRpcException.from(err)
-                                                    is JsonRpcException -> err
-                                                    else -> throw IllegalStateException("Cannot convert from exception", err)
-                                                }
-                                                quorum.record(cleanErr, api)
-                                                // it it's failed after that, then we don't need more calls, stop api source
-                                                if (quorum.isFailed()) {
-                                                    apis.resolve()
-                                                } else {
-                                                    apis.request(1)
-                                                }
-                                            } else {
-                                                log.warn("Result processing error", err)
-                                            }
-                                            Mono.empty()
-                                        }
+            .takeUntil {
+                quorum.isFailed() || quorum.isResolved()
+            }
+            .flatMap { api ->
+                api.getApi()
+                    .read(key)
+                    .flatMap { response ->
+                        response.requireResult()
+                            .onErrorResume { err ->
+                                if (err is RpcException || err is JsonRpcException) {
+                                    // on error notify quorum, it may use error message or other details
+                                    val cleanErr: JsonRpcException = when (err) {
+                                        is RpcException -> JsonRpcException.from(err)
+                                        is JsonRpcException -> err
+                                        else -> throw IllegalStateException("Cannot convert from exception", err)
+                                    }
+                                    quorum.record(cleanErr, api)
+                                    // it it's failed after that, then we don't need more calls, stop api source
+                                    if (quorum.isFailed()) {
+                                        apis.resolve()
+                                    } else {
+                                        apis.request(1)
+                                    }
+                                } else {
+                                    log.warn("Result processing error", err)
+                                }
+                                Mono.empty()
                             }
-                            .map { Tuples.of(it, api) }
-                }
-                .retryWhen(retrySpec)
-                // record all correct responses until quorum reached
-                .reduce(quorum, { res, a ->
-                    if (res.record(a.t1, a.t2)) {
-                        apis.resolve()
-                    } else {
-                        apis.request(1)
-                    }
-                    res
-                })
-                // if last call resulted in error it's still possible that request was resolved correctly. i.e. for BroadcastQuorum
-                .onErrorResume { err ->
-                    if (quorum.isResolved()) {
-                        Mono.just(quorum)
-                    } else {
-                        Mono.error(err)
                     }
+                    .map { Tuples.of(it, api) }
+            }
+            .retryWhen(retrySpec)
+            // record all correct responses until quorum reached
+            .reduce(quorum, { res, a ->
+                if (res.record(a.t1, a.t2)) {
+                    apis.resolve()
+                } else {
+                    apis.request(1)
                 }
-                .doOnNext {
-                    if (!it.isResolved() && !it.isFailed()) {
-                        log.debug("No quorum for ${key.method} using [${quorum}]. Error: ${it.getError()?.message ?: ""}")
-                    }
+                res
+            })
+            // if last call resulted in error it's still possible that request was resolved correctly. i.e. for BroadcastQuorum
+            .onErrorResume { err ->
+                if (quorum.isResolved()) {
+                    Mono.just(quorum)
+                } else {
+                    Mono.error(err)
                 }
-                // return nothing if not resolved
-                .filter { it.isResolved() }
-                .map {
-                    // TODO find actual quorum number
-                    QuorumRpcReader.Result(it.getResult()!!, 1)
+            }
+            .doOnNext {
+                if (!it.isResolved() && !it.isFailed()) {
+                    log.debug("No quorum for ${key.method} using [$quorum]. Error: ${it.getError()?.message ?: ""}")
                 }
-                .switchIfEmpty(defaultResult)
+            }
+            // return nothing if not resolved
+            .filter { it.isResolved() }
+            .map {
+                // TODO find actual quorum number
+                QuorumRpcReader.Result(it.getResult()!!, 1)
+            }
+            .switchIfEmpty(defaultResult)
     }
 
-
     class Result(
-            val value: ByteArray,
-            val quorum: Int
+        val value: ByteArray,
+        val quorum: Int
     )
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/quorum/ValueAwareQuorum.kt

@@ -16,18 +16,16 @@
  */
 package io.emeraldpay.dshackle.quorum
 
-import com.fasterxml.jackson.databind.ObjectMapper
 import io.emeraldpay.dshackle.Global
 import io.emeraldpay.dshackle.upstream.Upstream
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcError
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcException
-import io.emeraldpay.etherjar.rpc.JacksonRpcConverter
 import io.emeraldpay.etherjar.rpc.RpcException
 import org.slf4j.LoggerFactory
 
 abstract class ValueAwareQuorum<T>(
-        val clazz: Class<T>
-): CallQuorum {
+    val clazz: Class<T>
+) : CallQuorum {
 
     private val log = LoggerFactory.getLogger(ValueAwareQuorum::class.java)
     private var rpcError: JsonRpcError? = null
@@ -45,7 +43,7 @@ abstract class ValueAwareQuorum<T>(
         } catch (e: Exception) {
             recordError(response, e.message, upstream)
         }
-        return isResolved();
+        return isResolved()
     }
 
     override fun record(error: JsonRpcException, upstream: Upstream) {
@@ -60,4 +58,4 @@ abstract class ValueAwareQuorum<T>(
     override fun getError(): JsonRpcError? {
         return rpcError
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/reader/CompoundReader.kt

@@ -20,15 +20,14 @@ import io.emeraldpay.dshackle.Defaults
 import org.slf4j.LoggerFactory
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
-import java.time.Duration
 
 /**
  * Composition of multiple readers.
  * Reader returns first value returned by any of the source readers by checking one by one until one of them returns a non-empty result.
  */
 class CompoundReader<K, D>(
-        private vararg val readers: Reader<K, D>
-): Reader<K, D> {
+    private vararg val readers: Reader<K, D>
+) : Reader<K, D> {
 
     companion object {
         private val log = LoggerFactory.getLogger(CompoundReader::class.java)
@@ -39,13 +38,12 @@ class CompoundReader<K, D>(
             return Mono.empty()
         }
         return Flux.fromIterable(readers.asIterable())
-                .flatMap({ rdr ->
-                    rdr.read(key)
-                            .timeout(Defaults.timeoutInternal, Mono.empty())
-                            .doOnError { t -> log.warn("Failed to read from $rdr", t) }
-                            .onErrorResume { Mono.empty() }
-                }, 1)
-                .next()
+            .flatMap({ rdr ->
+                rdr.read(key)
+                    .timeout(Defaults.timeoutInternal, Mono.empty())
+                    .doOnError { t -> log.warn("Failed to read from $rdr", t) }
+                    .onErrorResume { Mono.empty() }
+            }, 1)
+            .next()
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/reader/EmptyReader.kt

@@ -18,9 +18,9 @@ package io.emeraldpay.dshackle.reader
 
 import reactor.core.publisher.Mono
 
-class EmptyReader<K, D>: Reader<K, D> {
+class EmptyReader<K, D> : Reader<K, D> {
 
     override fun read(key: K): Mono<D> {
         return Mono.empty()
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/reader/Reader.kt

@@ -21,5 +21,4 @@ import reactor.core.publisher.Mono
 interface Reader<in K, D> {
 
     fun read(key: K): Mono<D>
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/reader/RekeyingReader.kt

@@ -22,22 +22,21 @@ import java.util.function.Function
  * Reader wrapper that maps the input key from ne value to another (ex. convert from Long to String)
  */
 class RekeyingReader<K, K1, D>(
-        /**
-         * Mapping between original Key and Key supported by the reader
-         */
-        private val rekey: Function<K, K1>,
-        /**
-         * Actual reader
-         */
-        private val reader: Reader<K1, D>
+    /**
+     * Mapping between original Key and Key supported by the reader
+     */
+    private val rekey: Function<K, K1>,
+    /**
+     * Actual reader
+     */
+    private val reader: Reader<K1, D>
 ) : Reader<K, D> {
 
     override fun read(key: K): Mono<D> {
         return Mono.just(key)
-                .map(rekey)
-                .flatMap {
-                    reader.read(it)
-                }
+            .map(rekey)
+            .flatMap {
+                reader.read(it)
+            }
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/reader/RpcReader.kt

@@ -25,8 +25,8 @@ import reactor.core.publisher.Mono
  * Reader that requests data through upstream RPC using provided JSON RPC request builder
  */
 class RpcReader<T>(
-        private val up: Multistream,
-        private val paramsBuilder: (T) -> JsonRpcRequest
+    private val up: Multistream,
+    private val paramsBuilder: (T) -> JsonRpcRequest
 ) : Reader<T, ByteArray> {
 
     companion object {
@@ -45,11 +45,10 @@ class RpcReader<T>(
 
     override fun read(key: T): Mono<ByteArray> {
         return up.getDirectApi(Selector.empty)
-                .flatMap { rdr ->
-                    rdr.read(paramsBuilder(key)).flatMap {
-                        it.requireResult()
-                    }
+            .flatMap { rdr ->
+                rdr.read(paramsBuilder(key)).flatMap {
+                    it.requireResult()
                 }
+            }
     }
-
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/reader/TransformingReader.kt

@@ -22,18 +22,17 @@ import java.util.function.Function
  * Reader wrapper that transforms output of the reader to a different format
  */
 class TransformingReader<K, D0, D>(
-        /**
-         * Actual reader
-         */
-        private val reader: Reader<K, D0>,
-        /**
-         * Result transformation
-         */
-        private val transformer: Function<in D0, out D>
+    /**
+     * Actual reader
+     */
+    private val reader: Reader<K, D0>,
+    /**
+     * Result transformation
+     */
+    private val transformer: Function<in D0, out D>
 ) : Reader<K, D> {
 
     override fun read(key: K): Mono<D> {
         return reader.read(key).map(transformer)
     }
-
-}
+}

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

@@ -31,44 +31,45 @@ import org.springframework.context.annotation.DependsOn
 import org.springframework.stereotype.Service
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
-import java.util.*
+import java.util.Locale
 import java.util.concurrent.TimeUnit
 
-@Service @DependsOn("monitoringSetup")
+@Service
+@DependsOn("monitoringSetup")
 class BlockchainRpc(
-        @Autowired private val nativeCall: NativeCall,
-        @Autowired private val nativeSubscribe: NativeSubscribe,
-        @Autowired private val streamHead: StreamHead,
-        @Autowired private val trackTx: List<TrackTx>,
-        @Autowired private val trackAddress: List<TrackAddress>,
-        @Autowired private val describe: Describe,
-        @Autowired private val subscribeStatus: SubscribeStatus
-): ReactorBlockchainGrpc.BlockchainImplBase() {
+    @Autowired private val nativeCall: NativeCall,
+    @Autowired private val nativeSubscribe: NativeSubscribe,
+    @Autowired private val streamHead: StreamHead,
+    @Autowired private val trackTx: List<TrackTx>,
+    @Autowired private val trackAddress: List<TrackAddress>,
+    @Autowired private val describe: Describe,
+    @Autowired private val subscribeStatus: SubscribeStatus
+) : ReactorBlockchainGrpc.BlockchainImplBase() {
 
     private val log = LoggerFactory.getLogger(BlockchainRpc::class.java)
 
     private val describeMetric = Counter.builder("request.grpc.request")
-            .tag("type", "describe")
-            .tag("chain", "NA")
-            .register(Metrics.globalRegistry)
+        .tag("type", "describe")
+        .tag("chain", "NA")
+        .register(Metrics.globalRegistry)
     private val subscribeStatusMetric = Counter.builder("request.grpc.request")
-            .tag("type", "subscribeStatus")
-            .tag("chain", "NA")
-            .register(Metrics.globalRegistry)
+        .tag("type", "subscribeStatus")
+        .tag("chain", "NA")
+        .register(Metrics.globalRegistry)
     private val errorMetric = Counter.builder("request.grpc.err")
-            .register(Metrics.globalRegistry)
+        .register(Metrics.globalRegistry)
     private val chainMetrics = ChainValue { chain -> RequestMetrics(chain) }
 
     override fun nativeCall(request: Mono<BlockchainOuterClass.NativeCallRequest>): Flux<BlockchainOuterClass.NativeCallReplyItem> {
         var startTime = 0L
         var metrics: RequestMetrics? = null
         return nativeCall.nativeCall(
-                request
-                        .doOnNext {
-                            metrics = chainMetrics.get(it.chain)
-                            metrics!!.nativeCallMetric.increment()
-                            startTime = System.currentTimeMillis()
-                        }
+            request
+                .doOnNext {
+                    metrics = chainMetrics.get(it.chain)
+                    metrics!!.nativeCallMetric.increment()
+                    startTime = System.currentTimeMillis()
+                }
         ).doOnNext {
             metrics?.nativeCallRespMetric?.record(System.currentTimeMillis() - startTime, TimeUnit.MILLISECONDS)
         }.doOnError { errorMetric.increment() }
@@ -77,11 +78,11 @@ class BlockchainRpc(
     override fun nativeSubscribe(request: Mono<BlockchainOuterClass.NativeSubscribeRequest>): Flux<BlockchainOuterClass.NativeSubscribeReplyItem> {
         var metrics: RequestMetrics? = null
         return nativeSubscribe.nativeSubscribe(
-                request
-                        .doOnNext {
-                            metrics = chainMetrics.get(it.chain)
-                            metrics!!.nativeSubscribeMetric.increment()
-                        }
+            request
+                .doOnNext {
+                    metrics = chainMetrics.get(it.chain)
+                    metrics!!.nativeSubscribeMetric.increment()
+                }
         ).doOnNext {
             metrics?.nativeSubscribeRespMetric?.increment()
         }.doOnError { errorMetric.increment() }
@@ -89,8 +90,8 @@ class BlockchainRpc(
 
     override fun subscribeHead(request: Mono<Common.Chain>): Flux<BlockchainOuterClass.ChainHead> {
         return streamHead.add(
-                request
-                        .doOnNext { chainMetrics.get(it.type).subscribeHeadMetric.increment() }
+            request
+                .doOnNext { chainMetrics.get(it.type).subscribeHeadMetric.increment() }
         ).doOnError { errorMetric.increment() }
     }
 
@@ -102,8 +103,8 @@ class BlockchainRpc(
             try {
                 trackTx.find { it.isSupported(chain) }?.let { track ->
                     track.subscribe(request)
-                            .doOnNext { metrics.subscribeHeadRespMetric.increment() }
-                            .doOnError { errorMetric.increment() }
+                        .doOnNext { metrics.subscribeHeadRespMetric.increment() }
+                        .doOnError { errorMetric.increment() }
                 } ?: Flux.error(SilentException.UnsupportedBlockchain(chain))
             } catch (t: Throwable) {
                 log.error("Internal error during Tx Subscription", t)
@@ -122,12 +123,12 @@ class BlockchainRpc(
             try {
                 trackAddress.find { it.isSupported(chain, asset) }?.let { track ->
                     track.subscribe(request)
-                            .doOnNext { metrics.subscribeBalanceRespMetric.increment() }
-                            .doOnError { errorMetric.increment() }
+                        .doOnNext { metrics.subscribeBalanceRespMetric.increment() }
+                        .doOnError { errorMetric.increment() }
                 } ?: Flux.error<BlockchainOuterClass.AddressBalance>(SilentException.UnsupportedBlockchain(chain))
-                                .doOnSubscribe {
-                                    log.error("Balance for $chain:$asset is not supported")
-                                }
+                    .doOnSubscribe {
+                        log.error("Balance for $chain:$asset is not supported")
+                    }
             } catch (t: Throwable) {
                 log.error("Internal error during Balance Subscription", t)
                 errorMetric.increment()
@@ -146,13 +147,16 @@ class BlockchainRpc(
             try {
                 trackAddress.find { it.isSupported(chain, asset) }?.let { track ->
                     track.getBalance(request)
-                            .doOnNext {
-                                metrics.getBalanceRespMetric.record(System.currentTimeMillis() - startTime, TimeUnit.MILLISECONDS)
-                            }
+                        .doOnNext {
+                            metrics.getBalanceRespMetric.record(
+                                System.currentTimeMillis() - startTime,
+                                TimeUnit.MILLISECONDS
+                            )
+                        }
                 } ?: Flux.error<BlockchainOuterClass.AddressBalance>(SilentException.UnsupportedBlockchain(chain))
-                                .doOnSubscribe {
-                                    log.error("Balance for $chain:$asset is not supported")
-                                }
+                    .doOnSubscribe {
+                        log.error("Balance for $chain:$asset is not supported")
+                    }
             } catch (t: Throwable) {
                 log.error("Internal error during Balance Request", t)
                 errorMetric.increment()
@@ -164,61 +168,61 @@ class BlockchainRpc(
     override fun describe(request: Mono<BlockchainOuterClass.DescribeRequest>): Mono<BlockchainOuterClass.DescribeResponse> {
         describeMetric.increment()
         return describe.describe(request)
-                .doOnError { errorMetric.increment() }
+            .doOnError { errorMetric.increment() }
     }
 
     override fun subscribeStatus(request: Mono<BlockchainOuterClass.StatusRequest>): Flux<BlockchainOuterClass.ChainStatus> {
         subscribeStatusMetric.increment()
         return subscribeStatus.subscribeStatus(request)
-                .doOnError { errorMetric.increment() }
+            .doOnError { errorMetric.increment() }
     }
 
     class RequestMetrics(chain: Chain) {
         val nativeCallMetric = Counter.builder("request.grpc.request")
-                .tag("type", "nativeCall")
-                .tag("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tag("type", "nativeCall")
+            .tag("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
         val nativeCallRespMetric = Timer.builder("request.grpc.response")
-                .tag("type", "nativeCall")
-                .tag("chain", chain.chainCode)
-                .publishPercentileHistogram()
-                .register(Metrics.globalRegistry)
+            .tag("type", "nativeCall")
+            .tag("chain", chain.chainCode)
+            .publishPercentileHistogram()
+            .register(Metrics.globalRegistry)
         val nativeSubscribeMetric = Counter.builder("request.grpc.request")
-                .tag("type", "nativeSubscribe")
-                .tag("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tag("type", "nativeSubscribe")
+            .tag("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
         val nativeSubscribeRespMetric = Counter.builder("request.grpc.response")
-                .tag("type", "nativeSubscribe")
-                .tag("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tag("type", "nativeSubscribe")
+            .tag("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
         val subscribeHeadMetric = Counter.builder("request.grpc.request")
-                .tag("type", "subscribeHead")
-                .tag("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tag("type", "subscribeHead")
+            .tag("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
         val subscribeHeadRespMetric = Counter.builder("request.grpc.reply")
-                .tag("type", "subscribeHead")
-                .tag("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tag("type", "subscribeHead")
+            .tag("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
         val subscribeTxMetric = Counter.builder("request.grpc.request")
-                .tag("type", "subscribeTx")
-                .tag("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tag("type", "subscribeTx")
+            .tag("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
         val subscribeBalanceMetric = Counter.builder("request.grpc.request")
-                .tag("type", "subscribeBalance")
-                .tag("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tag("type", "subscribeBalance")
+            .tag("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
         val subscribeBalanceRespMetric = Counter.builder("request.grpc.reply")
-                .tag("type", "subscribeBalance")
-                .tag("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tag("type", "subscribeBalance")
+            .tag("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
         val getBalanceMetric = Counter.builder("request.grpc.request")
-                .tag("type", "getBalance")
-                .tag("chain", chain.chainCode)
-                .register(Metrics.globalRegistry)
+            .tag("type", "getBalance")
+            .tag("chain", chain.chainCode)
+            .register(Metrics.globalRegistry)
         val getBalanceRespMetric = Timer.builder("request.grpc.response")
-                .tag("type", "getBalance")
-                .tag("chain", chain.chainCode)
-                .publishPercentileHistogram()
-                .register(Metrics.globalRegistry)
+            .tag("type", "getBalance")
+            .tag("chain", chain.chainCode)
+            .publishPercentileHistogram()
+            .register(Metrics.globalRegistry)
     }
-}
+}

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

@@ -19,15 +19,17 @@ package io.emeraldpay.dshackle.rpc
 import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.api.proto.Common
 import io.emeraldpay.dshackle.startup.QuorumForLabels
-import io.emeraldpay.dshackle.upstream.*
+import io.emeraldpay.dshackle.upstream.Capability
+import io.emeraldpay.dshackle.upstream.DefaultUpstream
+import io.emeraldpay.dshackle.upstream.MultistreamHolder
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Service
 import reactor.core.publisher.Mono
 
 @Service
 class Describe(
-        @Autowired private val multistreamHolder: MultistreamHolder,
-        @Autowired private val subscribeStatus: SubscribeStatus
+    @Autowired private val multistreamHolder: MultistreamHolder,
+    @Autowired private val subscribeStatus: SubscribeStatus
 ) {
 
     fun describe(requestMono: Mono<BlockchainOuterClass.DescribeRequest>): Mono<BlockchainOuterClass.DescribeResponse> {
@@ -39,9 +41,9 @@ class Describe(
                     val targets = chainUpstreams.getMethods().getSupportedMethods()
                     val capabilities: MutableSet<Capability> = mutableSetOf()
                     val chainDescription = BlockchainOuterClass.DescribeChain.newBuilder()
-                            .setChain(Common.ChainRef.forNumber(chain.id))
-                            .addAllSupportedMethods(targets)
-                            .setStatus(status)
+                        .setChain(Common.ChainRef.forNumber(chain.id))
+                        .addAllSupportedMethods(targets)
+                        .setStatus(status)
                     chainUpstreams.getAll().let { ups ->
                         ups.forEach { up ->
                             val nodes = QuorumForLabels()
@@ -50,25 +52,27 @@ class Describe(
                             }
                             nodes.getAll().forEach { node ->
                                 val nodeDetails = BlockchainOuterClass.NodeDetails.newBuilder()
-                                        .setQuorum(node.quorum)
-                                        .addAllLabels(node.labels.entries.map { label ->
+                                    .setQuorum(node.quorum)
+                                    .addAllLabels(
+                                        node.labels.entries.map { label ->
                                             BlockchainOuterClass.Label.newBuilder()
-                                                    .setName(label.key)
-                                                    .setValue(label.value)
-                                                    .build()
-                                        })
+                                                .setName(label.key)
+                                                .setValue(label.value)
+                                                .build()
+                                        }
+                                    )
                                 chainDescription.addNodes(nodeDetails)
                             }
                             capabilities.addAll(up.getCapabilities())
                         }
                     }
                     chainDescription.addAllCapabilities(
-                            capabilities.map {
-                                when (it) {
-                                    Capability.RPC -> BlockchainOuterClass.Capabilities.CAP_CALLS
-                                    Capability.BALANCE -> BlockchainOuterClass.Capabilities.CAP_BALANCE
-                                }
+                        capabilities.map {
+                            when (it) {
+                                Capability.RPC -> BlockchainOuterClass.Capabilities.CAP_CALLS
+                                Capability.BALANCE -> BlockchainOuterClass.Capabilities.CAP_BALANCE
                             }
+                        }
                     )
                     resp.addChains(chainDescription.build())
                 }
@@ -76,5 +80,4 @@ class Describe(
             resp.build()
         }
     }
-
-}
+}

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

@@ -17,12 +17,11 @@ class EthereumAddresses {
                 Flux.just(Address.from(addresses.addressSingle.address))
             Common.AnyAddress.AddrTypeCase.ADDRESS_MULTI ->
                 Flux.fromIterable(addresses.addressMulti.addressesList)
-                        .map { Address.from(it.address) }
+                    .map { Address.from(it.address) }
             else -> {
                 log.error("Unsupported address type: ${addresses.addrTypeCase}")
                 Flux.empty()
             }
         }
     }
-
-}
+}

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

@@ -21,33 +21,35 @@ import com.google.protobuf.ByteString
 import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.dshackle.Global
 import io.emeraldpay.dshackle.SilentException
-import io.emeraldpay.dshackle.upstream.*
-import io.emeraldpay.dshackle.quorum.AlwaysQuorum
 import io.emeraldpay.dshackle.quorum.CallQuorum
 import io.emeraldpay.dshackle.quorum.NotLaggingQuorum
 import io.emeraldpay.dshackle.quorum.QuorumReaderFactory
+import io.emeraldpay.dshackle.upstream.ApiSource
+import io.emeraldpay.dshackle.upstream.Multistream
+import io.emeraldpay.dshackle.upstream.MultistreamHolder
+import io.emeraldpay.dshackle.upstream.Selector
 import io.emeraldpay.dshackle.upstream.calls.EthereumCallSelector
 import io.emeraldpay.dshackle.upstream.ethereum.EthereumMultistream
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcError
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcException
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcRequest
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcResponse
-import io.emeraldpay.grpc.BlockchainType
-import io.emeraldpay.grpc.Chain
 import io.emeraldpay.etherjar.rpc.RpcException
 import io.emeraldpay.etherjar.rpc.RpcResponseError
+import io.emeraldpay.grpc.BlockchainType
+import io.emeraldpay.grpc.Chain
 import org.apache.commons.lang3.StringUtils
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Service
-import reactor.core.publisher.*
+import reactor.core.publisher.Flux
+import reactor.core.publisher.Mono
 import reactor.kotlin.core.publisher.toMono
-import java.lang.Exception
-import java.util.*
+import java.util.EnumMap
 
 @Service
 open class NativeCall(
-        @Autowired private val multistreamHolder: MultistreamHolder
+    @Autowired private val multistreamHolder: MultistreamHolder
 ) {
 
     private val log = LoggerFactory.getLogger(NativeCall::class.java)
@@ -69,19 +71,19 @@ open class NativeCall(
 
     open fun nativeCall(requestMono: Mono<BlockchainOuterClass.NativeCallRequest>): Flux<BlockchainOuterClass.NativeCallReplyItem> {
         return nativeCallResult(requestMono)
-                .map(this::buildResponse)
-                .onErrorResume(this::processException)
+            .map(this::buildResponse)
+            .onErrorResume(this::processException)
     }
 
     open fun nativeCallResult(requestMono: Mono<BlockchainOuterClass.NativeCallRequest>): Flux<CallResult> {
         return requestMono.flatMapMany(this::prepareCall)
-                .map(this::parseParams)
-                .parallel()
-                .flatMap {
-                    this.fetch(it)
-                            .doOnError { e -> log.warn("Error during native call: ${e.message}") }
-                }
-                .sequential()
+            .map(this::parseParams)
+            .parallel()
+            .flatMap {
+                this.fetch(it)
+                    .doOnError { e -> log.warn("Error during native call: ${e.message}") }
+            }
+            .sequential()
     }
 
     fun parseParams(it: CallContext<RawCallDetails>): CallContext<ParsedCallDetails> {
@@ -91,14 +93,14 @@ open class NativeCall(
 
     fun buildResponse(it: CallResult): BlockchainOuterClass.NativeCallReplyItem {
         val result = BlockchainOuterClass.NativeCallReplyItem.newBuilder()
-                .setSucceed(!it.isError())
-                .setId(it.id)
+            .setSucceed(!it.isError())
+            .setId(it.id)
         if (it.isError()) {
             it.error?.let { error ->
                 result.setErrorMessage(error.message)
             }
         } else {
-            result.setPayload(ByteString.copyFrom(it.result))
+            result.payload = ByteString.copyFrom(it.result)
         }
 
         return result.build()
@@ -112,11 +114,11 @@ open class NativeCall(
             0
         }
         return BlockchainOuterClass.NativeCallReplyItem.newBuilder()
-                .setSucceed(false)
-                .setErrorMessage(it?.message ?: "Internal error")
-                .setId(id)
-                .build()
-                .toMono()
+            .setSucceed(false)
+            .setErrorMessage(it?.message ?: "Internal error")
+            .setId(id)
+            .build()
+            .toMono()
     }
 
     fun prepareCall(request: BlockchainOuterClass.NativeCallRequest): Flux<CallContext<RawCallDetails>> {
@@ -130,31 +132,35 @@ open class NativeCall(
         }
 
         val upstream = multistreamHolder.getUpstream(chain)
-                ?: return Flux.error(CallFailure(0, SilentException.UnsupportedBlockchain(chain)))
+            ?: return Flux.error(CallFailure(0, SilentException.UnsupportedBlockchain(chain)))
 
         return prepareCall(request, upstream)
     }
 
-    fun prepareCall(request: BlockchainOuterClass.NativeCallRequest, upstream: Multistream): Flux<CallContext<RawCallDetails>> {
+    fun prepareCall(
+        request: BlockchainOuterClass.NativeCallRequest,
+        upstream: Multistream
+    ): Flux<CallContext<RawCallDetails>> {
         val chain = Chain.byId(request.chainValue)
         return Flux.fromIterable(request.itemsList).flatMap {
             val method = it.method
             val params = it.payload.toStringUtf8()
 
             // for ethereum the actual block needed for the call may be specified in the call parameters
-            val callSpecificMatcher: Mono<Selector.Matcher> = if (BlockchainType.from(upstream.chain) == BlockchainType.ETHEREUM) {
-                ethereumCallSelectors[chain]?.getMatcher(method, params, upstream.getHead())
-            } else {
-                null
-            } ?: Mono.empty()
+            val callSpecificMatcher: Mono<Selector.Matcher> =
+                if (BlockchainType.from(upstream.chain) == BlockchainType.ETHEREUM) {
+                    ethereumCallSelectors[chain]?.getMatcher(method, params, upstream.getHead())
+                } else {
+                    null
+                } ?: Mono.empty()
 
             callSpecificMatcher.defaultIfEmpty(Selector.empty).map { csm ->
                 val matcher = Selector.Builder()
-                        .withMatcher(csm)
-                        .forMethod(method)
-                        .forLabels(Selector.convertToMatcher(request.selector))
+                    .withMatcher(csm)
+                    .forMethod(method)
+                    .forLabels(Selector.convertToMatcher(request.selector))
 
-                val callQuorum = upstream.getMethods().getQuorumFor(method) ?: AlwaysQuorum() // can be null in tests
+                val callQuorum = upstream.getMethods().getQuorumFor(method) // can be null in tests
                 callQuorum.init(upstream.getHead())
 
                 // for NotLaggingQuorum it makes sense to select compatible upstreams before the call
@@ -172,22 +178,22 @@ open class NativeCall(
 
     fun fetch(ctx: CallContext<ParsedCallDetails>): Mono<CallResult> {
         return ctx.upstream.getRoutedApi(ctx.matcher)
-                .flatMap { api ->
-                    api.read(JsonRpcRequest(ctx.payload.method, ctx.payload.params))
-                            .flatMap(JsonRpcResponse::requireResult)
-                            .map {
-                                CallResult.ok(ctx.id, it)
-                            }
-                }.switchIfEmpty(
-                        Mono.just(ctx).flatMap(this::executeOnRemote)
-                )
-                .onErrorResume {
-                    if (it is CallFailure) {
-                        Mono.just(CallResult.fail(it.id, it.reason))
-                    } else {
-                        Mono.just(CallResult.fail(ctx.id, it))
+            .flatMap { api ->
+                api.read(JsonRpcRequest(ctx.payload.method, ctx.payload.params))
+                    .flatMap(JsonRpcResponse::requireResult)
+                    .map {
+                        CallResult.ok(ctx.id, it)
                     }
+            }.switchIfEmpty(
+                Mono.just(ctx).flatMap(this::executeOnRemote)
+            )
+            .onErrorResume {
+                if (it is CallFailure) {
+                    Mono.just(CallResult.fail(it.id, it.reason))
+                } else {
+                    Mono.just(CallResult.fail(ctx.id, it))
                 }
+            }
     }
 
     fun executeOnRemote(ctx: CallContext<ParsedCallDetails>): Mono<CallResult> {
@@ -196,21 +202,21 @@ open class NativeCall(
         }
         val reader = quorumReaderFactory.create(ctx.getApis(), ctx.callQuorum)
         return reader
-                .read(JsonRpcRequest(ctx.payload.method, ctx.payload.params))
-                .map {
-                    CallResult(ctx.id, it.value, null)
+            .read(JsonRpcRequest(ctx.payload.method, ctx.payload.params))
+            .map {
+                CallResult(ctx.id, it.value, null)
+            }
+            .onErrorResume { t ->
+                val failure = if (t is CallFailure) {
+                    CallResult.fail(t.id, t.reason)
+                } else {
+                    CallResult.fail(ctx.id, t)
                 }
-                .onErrorResume { t ->
-                    val failure = if (t is CallFailure) {
-                        CallResult.fail(t.id, t.reason)
-                    } else {
-                        CallResult.fail(ctx.id, t)
-                    }
-                    Mono.just(failure)
-                }
-                .switchIfEmpty(
-                        Mono.just(CallResult.fail(ctx.id, 1, "No response or no available upstream for ${ctx.payload.method}"))
-                )
+                Mono.just(failure)
+            }
+            .switchIfEmpty(
+                Mono.just(CallResult.fail(ctx.id, 1, "No response or no available upstream for ${ctx.payload.method}"))
+            )
     }
 
     @Suppress("UNCHECKED_CAST")
@@ -222,11 +228,13 @@ open class NativeCall(
         return req as List<Any>
     }
 
-    open class CallContext<T>(val id: Int,
-                              val upstream: Multistream,
-                              val matcher: Selector.Matcher,
-                              val callQuorum: CallQuorum,
-                              val payload: T) {
+    open class CallContext<T>(
+        val id: Int,
+        val upstream: Multistream,
+        val matcher: Selector.Matcher,
+        val callQuorum: CallQuorum,
+        val payload: T
+    ) {
         fun <X> withPayload(payload: X): CallContext<X> {
             return CallContext(id, upstream, matcher, callQuorum, payload)
         }
@@ -273,4 +281,4 @@ open class NativeCall(
 
     class RawCallDetails(val method: String, val params: String)
     class ParsedCallDetails(val method: String, val params: List<Any>)
-}
+}

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

@@ -34,7 +34,7 @@ import reactor.core.publisher.Mono
 
 @Service
 class NativeSubscribe(
-        @Autowired private val multistreamHolder: MultistreamHolder
+    @Autowired private val multistreamHolder: MultistreamHolder
 ) {
 
     companion object {
@@ -45,9 +45,9 @@ class NativeSubscribe(
 
     fun nativeSubscribe(request: Mono<BlockchainOuterClass.NativeSubscribeRequest>): Flux<BlockchainOuterClass.NativeSubscribeReplyItem> {
         return request
-                .flatMapMany(this@NativeSubscribe::start)
-                .map(this@NativeSubscribe::convertToProto)
-                .onErrorMap(this@NativeSubscribe::convertToStatus)
+            .flatMapMany(this@NativeSubscribe::start)
+            .map(this@NativeSubscribe::convertToProto)
+            .onErrorMap(this@NativeSubscribe::convertToStatus)
     }
 
     fun start(it: BlockchainOuterClass.NativeSubscribeRequest): Publisher<out Any> {
@@ -68,15 +68,15 @@ class NativeSubscribe(
 
     fun convertToStatus(t: Throwable) = when (t) {
         is SilentException.UnsupportedBlockchain -> StatusException(
-                Status.UNAVAILABLE.withDescription("BLOCKCHAIN UNAVAILABLE: ${t.blockchainId}")
+            Status.UNAVAILABLE.withDescription("BLOCKCHAIN UNAVAILABLE: ${t.blockchainId}")
         )
         is UnsupportedOperationException -> StatusException(
-                Status.UNIMPLEMENTED.withDescription(t.message)
+            Status.UNIMPLEMENTED.withDescription(t.message)
         )
         else -> {
             log.warn("Unhandled error", t)
             StatusException(
-                    Status.INTERNAL.withDescription(t.message)
+                Status.INTERNAL.withDescription(t.message)
             )
         }
     }
@@ -84,15 +84,14 @@ class NativeSubscribe(
     fun subscribe(chain: Chain, method: String, params: Any?): Flux<out Any> {
         val up = multistreamHolder.getUpstream(chain) ?: return Flux.error(SilentException.UnsupportedBlockchain(chain))
         return (up as EthereumMultistream)
-                .getSubscribe()
-                .subscribe(method, params)
+            .getSubscribe()
+            .subscribe(method, params)
     }
 
     fun convertToProto(value: Any): BlockchainOuterClass.NativeSubscribeReplyItem {
         val result = objectMapper.writeValueAsBytes(value)
         return BlockchainOuterClass.NativeSubscribeReplyItem.newBuilder()
-                .setPayload(ByteString.copyFrom(result))
-                .build()
+            .setPayload(ByteString.copyFrom(result))
+            .build()
     }
-
-}
+}

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

@@ -30,7 +30,7 @@ import reactor.core.publisher.Mono
 
 @Service
 class StreamHead(
-        @Autowired private val multistreamHolder: MultistreamHolder
+    @Autowired private val multistreamHolder: MultistreamHolder
 ) {
 
     private val log = LoggerFactory.getLogger(StreamHead::class.java)
@@ -40,24 +40,23 @@ class StreamHead(
             Chain.byId(request.type.number)
         }.flatMapMany { chain ->
             val up = multistreamHolder.getUpstream(chain)
-                    ?: return@flatMapMany Flux.error<BlockchainOuterClass.ChainHead>(Exception("Unavailable chain: $chain"))
+                ?: return@flatMapMany Flux.error<BlockchainOuterClass.ChainHead>(Exception("Unavailable chain: $chain"))
             up.getHead()
-                    .getFlux()
-                    .map { asProto(chain, it!!) }
-                    .onErrorContinue { t, _ ->
-                        log.warn("Head subscription error: ${t.message}")
-                    }
+                .getFlux()
+                .map { asProto(chain, it!!) }
+                .onErrorContinue { t, _ ->
+                    log.warn("Head subscription error: ${t.message}")
+                }
         }
     }
 
     fun asProto(chain: Chain, block: BlockContainer): BlockchainOuterClass.ChainHead {
         return BlockchainOuterClass.ChainHead.newBuilder()
-                .setChainValue(chain.id)
-                .setHeight(block.height)
-                .setTimestamp(block.timestamp.toEpochMilli())
-                .setWeight(ByteString.copyFrom(block.difficulty.toByteArray()))
-                .setBlockId(block.hash.toHex())
-                .build()
+            .setChainValue(chain.id)
+            .setHeight(block.height)
+            .setTimestamp(block.timestamp.toEpochMilli())
+            .setWeight(ByteString.copyFrom(block.difficulty.toByteArray()))
+            .setBlockId(block.hash.toHex())
+            .build()
     }
-
-}
+}

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

@@ -18,7 +18,9 @@ package io.emeraldpay.dshackle.rpc
 
 import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.api.proto.Common
-import io.emeraldpay.dshackle.upstream.*
+import io.emeraldpay.dshackle.upstream.Multistream
+import io.emeraldpay.dshackle.upstream.MultistreamHolder
+import io.emeraldpay.dshackle.upstream.UpstreamAvailability
 import io.emeraldpay.grpc.Chain
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Service
@@ -27,7 +29,7 @@ import reactor.core.publisher.Mono
 
 @Service
 class SubscribeStatus(
-        @Autowired private val multistreamHolder: MultistreamHolder
+    @Autowired private val multistreamHolder: MultistreamHolder
 ) {
 
     fun subscribeStatus(requestMono: Mono<BlockchainOuterClass.StatusRequest>): Flux<BlockchainOuterClass.ChainStatus> {
@@ -52,10 +54,10 @@ class SubscribeStatus(
 
     fun chainUnavailable(chain: Chain): BlockchainOuterClass.ChainStatus {
         return BlockchainOuterClass.ChainStatus.newBuilder()
-                .setAvailability(BlockchainOuterClass.AvailabilityEnum.AVAIL_UNAVAILABLE)
-                .setChain(Common.ChainRef.forNumber(chain.id))
-                .setQuorum(0)
-                .build()
+            .setAvailability(BlockchainOuterClass.AvailabilityEnum.AVAIL_UNAVAILABLE)
+            .setChain(Common.ChainRef.forNumber(chain.id))
+            .setQuorum(0)
+            .build()
     }
 
     fun chainStatus(chain: Chain, available: UpstreamAvailability, ups: Multistream): BlockchainOuterClass.ChainStatus {
@@ -67,12 +69,11 @@ class SubscribeStatus(
             0
         }
         return BlockchainOuterClass.ChainStatus.newBuilder()
-                .setAvailability(BlockchainOuterClass.AvailabilityEnum.forNumber(available.grpcId))
-                .setChain(Common.ChainRef.forNumber(chain.id))
-                .setQuorum(quorum)
-                .build()
+            .setAvailability(BlockchainOuterClass.AvailabilityEnum.forNumber(available.grpcId))
+            .setChain(Common.ChainRef.forNumber(chain.id))
+            .setQuorum(quorum)
+            .build()
     }
 
     class ChainSubscription(val chain: Chain, val up: Multistream, val avail: UpstreamAvailability)
-
-}
+}

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

@@ -18,7 +18,6 @@ package io.emeraldpay.dshackle.rpc
 import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.grpc.Chain
 import reactor.core.publisher.Flux
-import reactor.core.publisher.Mono
 
 /**
  * Base interface to tracking balance on a single blockchain
@@ -28,5 +27,4 @@ interface TrackAddress {
     fun isSupported(chain: Chain, asset: String): Boolean
     fun getBalance(request: BlockchainOuterClass.BalanceRequest): Flux<BlockchainOuterClass.AddressBalance>
     fun subscribe(request: BlockchainOuterClass.BalanceRequest): Flux<BlockchainOuterClass.AddressBalance>
-
-}
+}

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

@@ -18,7 +18,6 @@ package io.emeraldpay.dshackle.rpc
 import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.api.proto.Common
 import io.emeraldpay.api.proto.ReactorBlockchainGrpc
-import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.dshackle.Defaults
 import io.emeraldpay.dshackle.SilentException
 import io.emeraldpay.dshackle.upstream.Capability
@@ -27,6 +26,7 @@ import io.emeraldpay.dshackle.upstream.Selector
 import io.emeraldpay.dshackle.upstream.bitcoin.BitcoinMultistream
 import io.emeraldpay.dshackle.upstream.bitcoin.data.SimpleUnspent
 import io.emeraldpay.dshackle.upstream.grpc.BitcoinGrpcUpstream
+import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.grpc.Chain
 import org.apache.commons.lang3.StringUtils
 import org.bitcoinj.params.MainNetParams
@@ -37,14 +37,12 @@ import org.springframework.stereotype.Service
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
 import java.math.BigInteger
-import java.time.Duration
 import java.util.concurrent.ConcurrentHashMap
 import javax.annotation.PostConstruct
-import kotlin.collections.HashMap
 
 @Service
 class TrackBitcoinAddress(
-        @Autowired private val multistreamHolder: MultistreamHolder
+    @Autowired private val multistreamHolder: MultistreamHolder
 ) : TrackAddress {
 
     companion object {
@@ -52,8 +50,8 @@ class TrackBitcoinAddress(
     }
 
     override fun isSupported(chain: Chain, asset: String): Boolean {
-        return (asset == "bitcoin" || asset == "btc" || asset == "satoshi")
-                && BlockchainType.from(chain) == BlockchainType.BITCOIN && multistreamHolder.isAvailable(chain)
+        return (asset == "bitcoin" || asset == "btc" || asset == "satoshi") &&
+            BlockchainType.from(chain) == BlockchainType.BITCOIN && multistreamHolder.isAvailable(chain)
     }
 
     /**
@@ -65,8 +63,8 @@ class TrackBitcoinAddress(
      * Criteria for a remote grpc upstream that can provide a balance
      */
     private val balanceUpstreamMatcher = Selector.LocalAndMatcher(
-            Selector.GrpcMatcher(),
-            Selector.CapabilityMatcher(Capability.BALANCE)
+        Selector.GrpcMatcher(),
+        Selector.CapabilityMatcher(Capability.BALANCE)
     )
 
     @PostConstruct
@@ -99,7 +97,7 @@ class TrackBitcoinAddress(
         return when {
             request.address.hasAddressXpub() -> {
                 val xpubAddresses = api.getXpubAddresses()
-                        ?: return Flux.error(IllegalStateException("Xpub verification is not available"))
+                    ?: return Flux.error(IllegalStateException("Xpub verification is not available"))
 
                 val addressXpub = request.address.addressXpub
                 if (StringUtils.isEmpty(addressXpub.xpub)) {
@@ -109,45 +107,52 @@ class TrackBitcoinAddress(
                 val start = Math.max(0, addressXpub.start).toInt()
                 val limit = Math.min(100, Math.max(1, addressXpub.limit)).toInt()
                 xpubAddresses.activeAddresses(xpub, start, limit)
-                        .map { it.toString() }
-                        .doOnError { t -> log.error("Failed to process xpub. ${t.javaClass}:${t.message}") }
+                    .map { it.toString() }
+                    .doOnError { t -> log.error("Failed to process xpub. ${t.javaClass}:${t.message}") }
             }
             request.address.hasAddressSingle() -> {
                 Flux.just(request.address.addressSingle.address)
             }
             request.address.hasAddressMulti() -> {
                 Flux.fromIterable(
-                        request.address.addressMulti.addressesList
-                                .map { addr -> addr.address }
-                                //TODO why sorted?
-                                .sorted()
+                    request.address.addressMulti.addressesList
+                        .map { addr -> addr.address }
+                        // TODO why sorted?
+                        .sorted()
                 )
             }
             else -> Flux.error(IllegalArgumentException("Unsupported address type"))
         }
     }
 
-    fun requestBalances(chain: Chain, api: BitcoinMultistream, addresses: Flux<String>, includeUtxo: Boolean): Flux<AddressBalance> {
+    fun requestBalances(
+        chain: Chain,
+        api: BitcoinMultistream,
+        addresses: Flux<String>,
+        includeUtxo: Boolean
+    ): Flux<AddressBalance> {
         return addresses
-                .map { Address(chain, it) }
-                .flatMap { address ->
-                    balanceForAddress(api, address, includeUtxo)
-                }
+            .map { Address(chain, it) }
+            .flatMap { address ->
+                balanceForAddress(api, address, includeUtxo)
+            }
     }
 
     fun balanceForAddress(api: BitcoinMultistream, address: Address, includeUtxo: Boolean): Mono<AddressBalance> {
         return api.getReader()
-                .listUnspent(address.bitcoinAddress)
-                .map { unspent ->
-                    totalUnspent(address, includeUtxo, unspent)
-                }
-                .switchIfEmpty(Mono.just(0).map {
+            .listUnspent(address.bitcoinAddress)
+            .map { unspent ->
+                totalUnspent(address, includeUtxo, unspent)
+            }
+            .switchIfEmpty(
+                Mono.just(0).map {
                     AddressBalance(address, BigInteger.ZERO)
-                })
-                .onErrorResume { t ->
-                    log.error("Failed to get unspent", t)
-                    Mono.empty()
                 }
+            )
+            .onErrorResume { t ->
+                log.error("Failed to get unspent", t)
+                Mono.empty()
+            }
     }
 
     fun totalUnspent(address: Address, includeUtxo: Boolean, unspent: List<SimpleUnspent>): AddressBalance {
@@ -156,10 +161,10 @@ class TrackBitcoinAddress(
         } else {
             unspent.map {
                 AddressBalance(
-                        address,
-                        BigInteger.valueOf(it.value),
-                        if (includeUtxo) listOf(BalanceUtxo(it.txid, it.vout, it.value))
-                        else emptyList()
+                    address,
+                    BigInteger.valueOf(it.value),
+                    if (includeUtxo) listOf(BalanceUtxo(it.txid, it.vout, it.value))
+                    else emptyList()
                 )
             }.reduce { a, b -> a.plus(b) }
         }
@@ -169,26 +174,32 @@ class TrackBitcoinAddress(
         val ups = api.getApiSource(balanceUpstreamMatcher)
         ups.request(1)
         return Mono.from(ups)
-                .map { up ->
-                    up.cast(BitcoinGrpcUpstream::class.java).remote
-                }
-                .timeout(Defaults.timeoutInternal, Mono.empty())
-                .switchIfEmpty(
-                        Mono.just(0)
-                                .doOnNext {
-                                    log.warn("No upstream providing balance for ${api.chain}")
-                                }
-                                .then(Mono.error(SilentException.DataUnavailable("BALANCE")))
-                )
+            .map { up ->
+                up.cast(BitcoinGrpcUpstream::class.java).remote
+            }
+            .timeout(Defaults.timeoutInternal, Mono.empty())
+            .switchIfEmpty(
+                Mono.just(0)
+                    .doOnNext {
+                        log.warn("No upstream providing balance for ${api.chain}")
+                    }
+                    .then(Mono.error(SilentException.DataUnavailable("BALANCE")))
+            )
     }
 
-    fun getRemoteBalance(api: BitcoinMultistream, request: BlockchainOuterClass.BalanceRequest): Flux<BlockchainOuterClass.AddressBalance> {
+    fun getRemoteBalance(
+        api: BitcoinMultistream,
+        request: BlockchainOuterClass.BalanceRequest
+    ): Flux<BlockchainOuterClass.AddressBalance> {
         return getBalanceGrpc(api).flatMapMany { remote ->
             remote.getBalance(request)
         }
     }
 
-    fun subscribeRemoteBalance(api: BitcoinMultistream, request: BlockchainOuterClass.BalanceRequest): Flux<BlockchainOuterClass.AddressBalance> {
+    fun subscribeRemoteBalance(
+        api: BitcoinMultistream,
+        request: BlockchainOuterClass.BalanceRequest
+    ): Flux<BlockchainOuterClass.AddressBalance> {
         return getBalanceGrpc(api).flatMapMany { remote ->
             remote.subscribeBalance(request)
         }
@@ -197,43 +208,43 @@ class TrackBitcoinAddress(
     override fun getBalance(request: BlockchainOuterClass.BalanceRequest): Flux<BlockchainOuterClass.AddressBalance> {
         val chain = Chain.byId(request.asset.chainValue)
         val upstream = multistreamHolder.getUpstream(chain)?.cast(BitcoinMultistream::class.java)
-                ?: return Flux.error(SilentException.UnsupportedBlockchain(request.asset.chainValue))
+            ?: return Flux.error(SilentException.UnsupportedBlockchain(request.asset.chainValue))
         return if (isBalanceAvailable(chain)) {
             val addresses = allAddresses(upstream, request)
             requestBalances(chain, upstream, addresses, request.includeUtxo)
-                    .map(this@TrackBitcoinAddress::buildResponse)
-                    .doOnError { t ->
-                        log.error("Failed to get balance", t)
-                    }
+                .map(this@TrackBitcoinAddress::buildResponse)
+                .doOnError { t ->
+                    log.error("Failed to get balance", t)
+                }
         } else {
             getRemoteBalance(upstream, request)
-                    .doOnError { t ->
-                        log.error("Failed to get balance from remote", t)
-                    }
+                .doOnError { t ->
+                    log.error("Failed to get balance from remote", t)
+                }
         }
     }
 
     override fun subscribe(request: BlockchainOuterClass.BalanceRequest): Flux<BlockchainOuterClass.AddressBalance> {
         val chain = Chain.byId(request.asset.chainValue)
         val upstream = multistreamHolder.getUpstream(chain)?.cast(BitcoinMultistream::class.java)
-                ?: return Flux.error(SilentException.UnsupportedBlockchain(request.asset.chainValue))
+            ?: return Flux.error(SilentException.UnsupportedBlockchain(request.asset.chainValue))
         if (isBalanceAvailable(chain)) {
             val addresses = allAddresses(upstream, request).cache()
             val following = upstream.getHead().getFlux()
-                    .flatMap {
-                        requestBalances(chain, upstream, Flux.from(addresses), request.includeUtxo)
-                    }
+                .flatMap {
+                    requestBalances(chain, upstream, Flux.from(addresses), request.includeUtxo)
+                }
             val last = HashMap<String, BigInteger>()
             val result = following
-                    .filter { curr ->
-                        val prev = last[curr.address.address]
-                        //TODO utxo can change without changing balance
-                        val changed = prev == null || curr.balance != prev
-                        if (changed) {
-                            last[curr.address.address] = curr.balance
-                        }
-                        changed
+                .filter { curr ->
+                    val prev = last[curr.address.address]
+                    // TODO utxo can change without changing balance
+                    val changed = prev == null || curr.balance != prev
+                    if (changed) {
+                        last[curr.address.address] = curr.balance
                     }
+                    changed
+                }
 
             return result.map(this@TrackBitcoinAddress::buildResponse)
         } else {
@@ -243,24 +254,30 @@ class TrackBitcoinAddress(
 
     private fun buildResponse(address: AddressBalance): BlockchainOuterClass.AddressBalance {
         return BlockchainOuterClass.AddressBalance.newBuilder()
-                .setBalance(address.balance.toString(10))
-                .setAsset(Common.Asset.newBuilder()
-                        .setChainValue(address.address.chain.id)
-                        .setCode("BTC"))
-                .setAddress(Common.SingleAddress.newBuilder().setAddress(address.address.address))
-                .addAllUtxo(
-                        address.utxo.map { utxo ->
-                            BlockchainOuterClass.Utxo.newBuilder()
-                                    .setBalance(utxo.value.toString())
-                                    .setIndex(utxo.vout.toLong())
-                                    .setTxId(utxo.txid)
-                                    .build()
-                        }
-                )
-                .build()
+            .setBalance(address.balance.toString(10))
+            .setAsset(
+                Common.Asset.newBuilder()
+                    .setChainValue(address.address.chain.id)
+                    .setCode("BTC")
+            )
+            .setAddress(Common.SingleAddress.newBuilder().setAddress(address.address.address))
+            .addAllUtxo(
+                address.utxo.map { utxo ->
+                    BlockchainOuterClass.Utxo.newBuilder()
+                        .setBalance(utxo.value.toString())
+                        .setIndex(utxo.vout.toLong())
+                        .setTxId(utxo.txid)
+                        .build()
+                }
+            )
+            .build()
     }
 
-    open class AddressBalance(val address: Address, var balance: BigInteger = BigInteger.ZERO, var utxo: List<BalanceUtxo> = emptyList()) {
+    open class AddressBalance(
+        val address: Address,
+        var balance: BigInteger = BigInteger.ZERO,
+        var utxo: List<BalanceUtxo> = emptyList()
+    ) {
         constructor(chain: Chain, address: String, balance: BigInteger) : this(Address(chain, address), balance)
 
         fun plus(other: AddressBalance) = AddressBalance(address, balance + other.balance, utxo.plus(other.utxo))
@@ -268,7 +285,7 @@ class TrackBitcoinAddress(
 
     open class BalanceUtxo(val txid: String, val vout: Int, val value: Long)
 
-    //TODO use bitcoin class for address
+    // TODO use bitcoin class for address
     class Address(val chain: Chain, val address: String) {
         val network = if (chain == Chain.BITCOIN) {
             MainNetParams()
@@ -276,7 +293,7 @@ class TrackBitcoinAddress(
             TestNet3Params()
         }
         val bitcoinAddress = org.bitcoinj.core.Address.fromString(
-                network, address
+            network, address
         )
     }
-}
+}

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

@@ -18,11 +18,11 @@ package io.emeraldpay.dshackle.rpc
 import com.google.protobuf.ByteString
 import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.api.proto.Common
-import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.dshackle.SilentException
 import io.emeraldpay.dshackle.upstream.MultistreamHolder
 import io.emeraldpay.dshackle.upstream.bitcoin.BitcoinMultistream
 import io.emeraldpay.dshackle.upstream.bitcoin.ExtractBlock
+import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.grpc.Chain
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
@@ -37,7 +37,7 @@ import kotlin.math.min
 
 @Service
 class TrackBitcoinTx(
-        @Autowired private val multistreamHolder: MultistreamHolder
+    @Autowired private val multistreamHolder: MultistreamHolder
 ) : TrackTx {
 
     companion object {
@@ -51,61 +51,69 @@ class TrackBitcoinTx(
     override fun subscribe(request: BlockchainOuterClass.TxStatusRequest): Flux<BlockchainOuterClass.TxStatus> {
         val chain = Chain.byId(request.chainValue)
         val upstream = multistreamHolder.getUpstream(chain)?.cast(BitcoinMultistream::class.java)
-                ?: return Flux.error(SilentException.UnsupportedBlockchain(chain))
+            ?: return Flux.error(SilentException.UnsupportedBlockchain(chain))
         val txid = request.txId
         val confirmations = max(min(1, request.confirmationLimit), 12)
         return subscribe(chain, upstream, txid)
-                .takeUntil { tx ->
-                    tx.confirmations >= confirmations
-                }.map(this::asProto)
+            .takeUntil { tx ->
+                tx.confirmations >= confirmations
+            }.map(this::asProto)
     }
 
     fun subscribe(chain: Chain, upstream: BitcoinMultistream, txid: String): Flux<TxStatus> {
         return loadExisting(upstream, txid)
-                .flatMapMany { status ->
-                    if (status.mined) {
-                        //Head almost always knows the current height, so it can continue with calculating confirmations
-                        //without publishing an empty TxStatus first
-                        continueWithMined(upstream, status)
-                    } else {
-                        loadMempool(upstream, txid)
-                                .flatMapMany { tx ->
-                                    val next = if (tx.found) {
-                                        untilMined(upstream, tx)
-                                    } else {
-                                        untilFound(chain, upstream, txid)
-                                    }
-                                    //fist provide the current status, then updates
-                                    Flux.concat(Mono.just(tx), next)
-                                }
-                    }
+            .flatMapMany { status ->
+                if (status.mined) {
+                    // Head almost always knows the current height, so it can continue with calculating confirmations
+                    // without publishing an empty TxStatus first
+                    continueWithMined(upstream, status)
+                } else {
+                    loadMempool(upstream, txid)
+                        .flatMapMany { tx ->
+                            val next = if (tx.found) {
+                                untilMined(upstream, tx)
+                            } else {
+                                untilFound(chain, upstream, txid)
+                            }
+                            // fist provide the current status, then updates
+                            Flux.concat(Mono.just(tx), next)
+                        }
                 }
+            }
     }
 
     fun continueWithMined(upstream: BitcoinMultistream, status: TxStatus): Flux<TxStatus> {
         return upstream.getReader().getBlock(status.blockHash!!)
-                .map { block ->
-                    TxStatus(status.txid, true, ExtractBlock.getHeight(block), true, status.blockHash, ExtractBlock.getTime(block), ExtractBlock.getDifficulty(block))
-                }.flatMapMany { tx ->
-                    withConfirmations(upstream, tx)
-                }
+            .map { block ->
+                TxStatus(
+                    status.txid,
+                    true,
+                    ExtractBlock.getHeight(block),
+                    true,
+                    status.blockHash,
+                    ExtractBlock.getTime(block),
+                    ExtractBlock.getDifficulty(block)
+                )
+            }.flatMapMany { tx ->
+                withConfirmations(upstream, tx)
+            }
     }
 
     fun untilFound(chain: Chain, upstream: BitcoinMultistream, txid: String): Flux<TxStatus> {
         return Flux.interval(Duration.ofSeconds(1))
-                .take(Duration.ofMinutes(10))
-                .flatMap { loadMempool(upstream, txid) }
-                .skipUntil { it.found }
-                .flatMap { subscribe(chain, upstream, txid) }
-                .doOnError { t ->
-                    log.error("Failed to wait until found", t)
-                }
+            .take(Duration.ofMinutes(10))
+            .flatMap { loadMempool(upstream, txid) }
+            .skipUntil { it.found }
+            .flatMap { subscribe(chain, upstream, txid) }
+            .doOnError { t ->
+                log.error("Failed to wait until found", t)
+            }
     }
 
     fun untilMined(upstream: BitcoinMultistream, tx: TxStatus): Mono<TxStatus> {
         return upstream.getHead().getFlux().flatMap {
             loadExisting(upstream, tx.txid)
-                    .filter { it.mined }
+                .filter { it.mined }
         }.single()
     }
 
@@ -136,34 +144,36 @@ class TrackBitcoinTx(
 
     private fun asProto(tx: TxStatus): BlockchainOuterClass.TxStatus {
         val data = BlockchainOuterClass.TxStatus.newBuilder()
-                .setTxId(tx.txid)
-                .setConfirmations(tx.confirmations.toInt())
+            .setTxId(tx.txid)
+            .setConfirmations(tx.confirmations.toInt())
 
         data.broadcasted = tx.found
         val isMined = tx.mined
         data.mined = isMined
         if (isMined) {
             data.setBlock(
-                    Common.BlockInfo.newBuilder()
-                            .setBlockId(tx.blockHash!!.substring(2))
-                            .setTimestamp(tx.blockTime!!.toEpochMilli())
-                            .setWeight(ByteString.copyFrom(tx.blockTotalDifficulty!!.toByteArray()))
-                            .setHeight(tx.height!!)
+                Common.BlockInfo.newBuilder()
+                    .setBlockId(tx.blockHash!!.substring(2))
+                    .setTimestamp(tx.blockTime!!.toEpochMilli())
+                    .setWeight(ByteString.copyFrom(tx.blockTotalDifficulty!!.toByteArray()))
+                    .setHeight(tx.height!!)
             )
         }
         return data.build()
     }
 
     class TxStatus(
-            val txid: String,
-            val found: Boolean = false,
-            val height: Long? = null,
-            val mined: Boolean = false,
-            val blockHash: String? = null,
-            val blockTime: Instant? = null,
-            val blockTotalDifficulty: BigInteger? = null,
-            val confirmations: Long = 0) {
+        val txid: String,
+        val found: Boolean = false,
+        val height: Long? = null,
+        val mined: Boolean = false,
+        val blockHash: String? = null,
+        val blockTime: Instant? = null,
+        val blockTotalDifficulty: BigInteger? = null,
+        val confirmations: Long = 0
+    ) {
 
-        fun withHead(headHeight: Long) = TxStatus(txid, found, height, mined, blockHash, blockTime, blockTotalDifficulty, headHeight - height!! + 1)
+        fun withHead(headHeight: Long) =
+            TxStatus(txid, found, height, mined, blockHash, blockTime, blockTotalDifficulty, headHeight - height!! + 1)
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/rpc/TrackERC20Address.kt

@@ -2,7 +2,6 @@ package io.emeraldpay.dshackle.rpc
 
 import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.api.proto.Common
-import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.dshackle.SilentException
 import io.emeraldpay.dshackle.config.TokensConfig
 import io.emeraldpay.dshackle.upstream.Head
@@ -11,25 +10,25 @@ import io.emeraldpay.dshackle.upstream.Selector
 import io.emeraldpay.dshackle.upstream.ethereum.EthereumMultistream
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcRequest
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcResponse
-import io.emeraldpay.grpc.Chain
 import io.emeraldpay.etherjar.domain.Address
 import io.emeraldpay.etherjar.erc20.ERC20Token
 import io.emeraldpay.etherjar.hex.Hex32
 import io.emeraldpay.etherjar.hex.HexQuantity
+import io.emeraldpay.grpc.BlockchainType
+import io.emeraldpay.grpc.Chain
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Service
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
 import java.math.BigInteger
-import java.util.*
+import java.util.Locale
 import javax.annotation.PostConstruct
-import kotlin.collections.HashMap
 
 @Service
 class TrackERC20Address(
-        @Autowired private val multistreamHolder: MultistreamHolder,
-        @Autowired private val tokensConfig: TokensConfig
+    @Autowired private val multistreamHolder: MultistreamHolder,
+    @Autowired private val tokensConfig: TokensConfig
 ) : TrackAddress {
 
     companion object {
@@ -46,8 +45,8 @@ class TrackERC20Address(
             val asset = token.name!!.lowercase(Locale.getDefault())
             val id = TokenId(chain, asset)
             val definition = TokenDefinition(
-                    chain, asset,
-                    ERC20Token(Address.from(token.address))
+                chain, asset,
+                ERC20Token(Address.from(token.address))
             )
             tokens[id] = definition
             log.info("Enable ERC20 balance for $chain:$asset")
@@ -56,7 +55,7 @@ class TrackERC20Address(
 
     override fun isSupported(chain: Chain, asset: String): Boolean {
         return tokens.containsKey(TokenId(chain, asset.lowercase(Locale.getDefault()))) &&
-                BlockchainType.from(chain) == BlockchainType.ETHEREUM && multistreamHolder.isAvailable(chain)
+            BlockchainType.from(chain) == BlockchainType.ETHEREUM && multistreamHolder.isAvailable(chain)
     }
 
     override fun getBalance(request: BlockchainOuterClass.BalanceRequest): Flux<BlockchainOuterClass.AddressBalance> {
@@ -64,9 +63,9 @@ class TrackERC20Address(
         val asset = request.asset.code.lowercase(Locale.getDefault())
         val tokenDefinition = tokens[TokenId(chain, asset)] ?: return Flux.empty()
         return ethereumAddresses.extract(request.address)
-                .map { TrackedAddress(chain, it, tokenDefinition.token, tokenDefinition.name) }
-                .flatMap { addr -> getBalance(addr).map(addr::withBalance) }
-                .map { buildResponse(it) }
+            .map { TrackedAddress(chain, it, tokenDefinition.token, tokenDefinition.name) }
+            .flatMap { addr -> getBalance(addr).map(addr::withBalance) }
+            .map { buildResponse(it) }
     }
 
     override fun subscribe(request: BlockchainOuterClass.BalanceRequest): Flux<BlockchainOuterClass.AddressBalance> {
@@ -76,63 +75,65 @@ class TrackERC20Address(
         val head = multistreamHolder.getUpstream(chain)?.getHead()?.getFlux() ?: Flux.empty()
 
         return ethereumAddresses.extract(request.address)
-                .map { TrackedAddress(chain, it, tokenDefinition.token, tokenDefinition.name) }
-                .flatMap { addr ->
-                    val current = getBalance(addr)
-                    val updates = head.flatMap { getBalance(addr) }
-                    Flux.concat(current, updates)
-                            .distinctUntilChanged()
-                            .map { addr.withBalance(it) }
-                }
-                .map { buildResponse(it) }
+            .map { TrackedAddress(chain, it, tokenDefinition.token, tokenDefinition.name) }
+            .flatMap { addr ->
+                val current = getBalance(addr)
+                val updates = head.flatMap { getBalance(addr) }
+                Flux.concat(current, updates)
+                    .distinctUntilChanged()
+                    .map { addr.withBalance(it) }
+            }
+            .map { buildResponse(it) }
     }
 
     fun getBalance(addr: TrackedAddress): Mono<BigInteger> {
         val upstream = getUpstream(addr.chain)
         return upstream
-                .getDirectApi(Selector.empty)
-                .flatMap { api ->
-                    api.read(prepareEthCall(addr.token, addr.address, upstream.getHead()))
-                            .flatMap(JsonRpcResponse::requireStringResult)
-                            .map {
-                                Hex32.from(it).asQuantity().value
-                            }
-                }
+            .getDirectApi(Selector.empty)
+            .flatMap { api ->
+                api.read(prepareEthCall(addr.token, addr.address, upstream.getHead()))
+                    .flatMap(JsonRpcResponse::requireStringResult)
+                    .map {
+                        Hex32.from(it).asQuantity().value
+                    }
+            }
     }
 
     fun prepareEthCall(token: ERC20Token, target: Address, head: Head): JsonRpcRequest {
         val call = token
-                .readBalanceOf(target)
-                .toJson()
+            .readBalanceOf(target)
+            .toJson()
         val height = head.getCurrentHeight()?.let { HexQuantity.from(it).toHex() } ?: "latest"
         return JsonRpcRequest("eth_call", listOf(call, height))
     }
 
     fun getUpstream(chain: Chain): EthereumMultistream {
         return multistreamHolder.getUpstream(chain)?.cast(EthereumMultistream::class.java)
-                ?: throw SilentException.UnsupportedBlockchain(chain)
+            ?: throw SilentException.UnsupportedBlockchain(chain)
     }
 
     private fun buildResponse(address: TrackedAddress): BlockchainOuterClass.AddressBalance {
         return BlockchainOuterClass.AddressBalance.newBuilder()
-                .setBalance(address.balance!!.toString(10))
-                .setAsset(Common.Asset.newBuilder()
-                        .setChainValue(address.chain.id)
-                        .setCode(address.tokenName.uppercase(Locale.getDefault())))
-                .setAddress(Common.SingleAddress.newBuilder().setAddress(address.address.toHex()))
-                .build()
+            .setBalance(address.balance!!.toString(10))
+            .setAsset(
+                Common.Asset.newBuilder()
+                    .setChainValue(address.chain.id)
+                    .setCode(address.tokenName.uppercase(Locale.getDefault()))
+            )
+            .setAddress(Common.SingleAddress.newBuilder().setAddress(address.address.toHex()))
+            .build()
     }
 
-    class TrackedAddress(val chain: Chain,
-                         val address: Address,
-                         val token: ERC20Token,
-                         val tokenName: String,
-                         val balance: BigInteger? = null
+    class TrackedAddress(
+        val chain: Chain,
+        val address: Address,
+        val token: ERC20Token,
+        val tokenName: String,
+        val balance: BigInteger? = null
     ) {
         fun withBalance(balance: BigInteger) = TrackedAddress(chain, address, token, tokenName, balance)
     }
 
     data class TokenId(val chain: Chain, val name: String)
     data class TokenDefinition(val chain: Chain, val name: String, val token: ERC20Token)
-
-}
+}

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

@@ -18,24 +18,24 @@ package io.emeraldpay.dshackle.rpc
 
 import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.api.proto.Common
-import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.dshackle.Defaults
 import io.emeraldpay.dshackle.SilentException
 import io.emeraldpay.dshackle.upstream.MultistreamHolder
 import io.emeraldpay.dshackle.upstream.ethereum.EthereumMultistream
-import io.emeraldpay.grpc.Chain
 import io.emeraldpay.etherjar.domain.Address
 import io.emeraldpay.etherjar.domain.Wei
+import io.emeraldpay.grpc.BlockchainType
+import io.emeraldpay.grpc.Chain
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Service
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
-import java.util.*
+import java.util.Locale
 
 @Service
 class TrackEthereumAddress(
-        @Autowired private val multistreamHolder: MultistreamHolder
+    @Autowired private val multistreamHolder: MultistreamHolder
 ) : TrackAddress {
 
     private val log = LoggerFactory.getLogger(TrackEthereumAddress::class.java)
@@ -43,46 +43,46 @@ class TrackEthereumAddress(
 
     override fun isSupported(chain: Chain, asset: String): Boolean {
         return asset == "ether" &&
-                BlockchainType.from(chain) == BlockchainType.ETHEREUM && multistreamHolder.isAvailable(chain)
+            BlockchainType.from(chain) == BlockchainType.ETHEREUM && multistreamHolder.isAvailable(chain)
     }
 
     override fun getBalance(request: BlockchainOuterClass.BalanceRequest): Flux<BlockchainOuterClass.AddressBalance> {
         return initAddress(request)
-                .flatMap { a -> getBalance(a).map { a.withBalance(it) } }
-                .map { buildResponse(it) }
+            .flatMap { a -> getBalance(a).map { a.withBalance(it) } }
+            .map { buildResponse(it) }
     }
 
     override fun subscribe(request: BlockchainOuterClass.BalanceRequest): Flux<BlockchainOuterClass.AddressBalance> {
         val chain = Chain.byId(request.asset.chainValue)
         val head = multistreamHolder.getUpstream(chain)?.getHead()?.getFlux() ?: Flux.empty()
         val balances = initAddress(request)
-                .flatMap { tracked ->
-                    val current = getBalance(tracked)
-                            .map {
-                                tracked.withBalance(it)
-                            }
-                    val updates = head
-                            .flatMap {
-                                getBalance(tracked)
-                            }.map {
-                                tracked.withBalance(it)
-                            }
-
-                    Flux.concat(current, updates)
-                            .distinctUntilChanged {
-                                it.balance ?: Wei.ZERO
-                            }
-                }
-                .doOnError { t ->
-                    if (t is SilentException) {
-                        if (t is SilentException.UnsupportedBlockchain) {
-                            log.warn("Unsupported blockchain: ${t.blockchainId}")
-                        }
-                        log.debug("Failed to process subscription", t)
-                    } else {
-                        log.warn("Failed to process subscription", t)
+            .flatMap { tracked ->
+                val current = getBalance(tracked)
+                    .map {
+                        tracked.withBalance(it)
                     }
+                val updates = head
+                    .flatMap {
+                        getBalance(tracked)
+                    }.map {
+                        tracked.withBalance(it)
+                    }
+
+                Flux.concat(current, updates)
+                    .distinctUntilChanged {
+                        it.balance ?: Wei.ZERO
+                    }
+            }
+            .doOnError { t ->
+                if (t is SilentException) {
+                    if (t is SilentException.UnsupportedBlockchain) {
+                        log.warn("Unsupported blockchain: ${t.blockchainId}")
+                    }
+                    log.debug("Failed to process subscription", t)
+                } else {
+                    log.warn("Failed to process subscription", t)
                 }
+            }
 
         return balances.map {
             buildResponse(it)
@@ -91,7 +91,7 @@ class TrackEthereumAddress(
 
     fun getUpstream(chain: Chain): EthereumMultistream {
         return multistreamHolder.getUpstream(chain)?.cast(EthereumMultistream::class.java)
-                ?: throw SilentException.UnsupportedBlockchain(chain)
+            ?: throw SilentException.UnsupportedBlockchain(chain)
     }
 
     private fun initAddress(request: BlockchainOuterClass.BalanceRequest): Flux<TrackedAddress> {
@@ -110,33 +110,36 @@ class TrackEthereumAddress(
     private fun createAddress(address: Common.SingleAddress, chain: Chain): TrackedAddress {
         val addressParsed = Address.from(address.address)
         return TrackedAddress(
-                chain,
-                addressParsed
+            chain,
+            addressParsed
         )
     }
 
     fun getBalance(addr: TrackedAddress): Mono<Wei> {
         return getUpstream(addr.chain)
-                .getReader()
-                .balance()
-                .read(addr.address)
-                .timeout(Defaults.timeout)
+            .getReader()
+            .balance()
+            .read(addr.address)
+            .timeout(Defaults.timeout)
     }
 
     private fun buildResponse(address: TrackedAddress): BlockchainOuterClass.AddressBalance {
         return BlockchainOuterClass.AddressBalance.newBuilder()
-                .setBalance(address.balance!!.amount!!.toString(10))
-                .setAsset(Common.Asset.newBuilder()
-                        .setChainValue(address.chain.id)
-                        .setCode("ETHER"))
-                .setAddress(Common.SingleAddress.newBuilder().setAddress(address.address.toHex()))
-                .build()
+            .setBalance(address.balance!!.amount!!.toString(10))
+            .setAsset(
+                Common.Asset.newBuilder()
+                    .setChainValue(address.chain.id)
+                    .setCode("ETHER")
+            )
+            .setAddress(Common.SingleAddress.newBuilder().setAddress(address.address.toHex()))
+            .build()
     }
 
-    class TrackedAddress(val chain: Chain,
-                         val address: Address,
-                         val balance: Wei? = null
+    class TrackedAddress(
+        val chain: Chain,
+        val address: Address,
+        val balance: Wei? = null
     ) {
         fun withBalance(balance: Wei) = TrackedAddress(chain, address, balance)
     }
-}
+}

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

@@ -19,19 +19,19 @@ package io.emeraldpay.dshackle.rpc
 import com.google.protobuf.ByteString
 import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.api.proto.Common
-import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.dshackle.SilentException
 import io.emeraldpay.dshackle.data.BlockContainer
 import io.emeraldpay.dshackle.data.TxId
 import io.emeraldpay.dshackle.upstream.MultistreamHolder
 import io.emeraldpay.dshackle.upstream.ethereum.EthereumMultistream
-import io.emeraldpay.grpc.Chain
 import io.emeraldpay.etherjar.domain.BlockHash
 import io.emeraldpay.etherjar.domain.TransactionId
 import io.emeraldpay.etherjar.rpc.RpcException
 import io.emeraldpay.etherjar.rpc.json.BlockJson
 import io.emeraldpay.etherjar.rpc.json.TransactionJson
 import io.emeraldpay.etherjar.rpc.json.TransactionRefJson
+import io.emeraldpay.grpc.BlockchainType
+import io.emeraldpay.grpc.Chain
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Service
@@ -48,7 +48,7 @@ import kotlin.math.min
 
 @Service
 class TrackEthereumTx(
-        @Autowired private val multistreamHolder: MultistreamHolder
+    @Autowired private val multistreamHolder: MultistreamHolder
 ) : TrackTx {
 
     companion object {
@@ -70,63 +70,62 @@ class TrackEthereumTx(
         val base = prepareTracking(request)
         val up = getUpstream(base.chain)
         return update(base)
-                .defaultIfEmpty(base)
-                .flatMapMany {
-                    Flux.concat(Mono.just(it), subscribe(it, up))
-                            .distinctUntilChanged(TxDetails::status)
-                            .map(this@TrackEthereumTx::asProto)
-                            .subscribeOn(scheduler)
-                }
-                .doOnError { t ->
-                    log.error("Subscription error", t)
-                }
+            .defaultIfEmpty(base)
+            .flatMapMany {
+                Flux.concat(Mono.just(it), subscribe(it, up))
+                    .distinctUntilChanged(TxDetails::status)
+                    .map(this@TrackEthereumTx::asProto)
+                    .subscribeOn(scheduler)
+            }
+            .doOnError { t ->
+                log.error("Subscription error", t)
+            }
     }
 
-
     fun getUpstream(chain: Chain): EthereumMultistream {
         return multistreamHolder.getUpstream(chain)?.cast(EthereumMultistream::class.java)
-                ?: throw SilentException.UnsupportedBlockchain(chain)
+            ?: throw SilentException.UnsupportedBlockchain(chain)
     }
 
     fun subscribe(base: TxDetails, up: EthereumMultistream): Flux<TxDetails> {
         var latestTx = base
 
         val untilFound = Mono.just(latestTx)
-                .subscribeOn(scheduler)
-                .map {
-                    //replace with the latest value, it may be already found
-                    latestTx
+            .subscribeOn(scheduler)
+            .map {
+                // replace with the latest value, it may be already found
+                latestTx
+            }
+            .flatMap { latest ->
+                if (!latest.status.found) {
+                    update(latest).defaultIfEmpty(latestTx)
+                } else {
+                    Mono.just(latest)
                 }
-                .flatMap { latest ->
-                    if (!latest.status.found) {
-                        update(latest).defaultIfEmpty(latestTx)
-                    } else {
-                        Mono.just(latest)
-                    }
+            }
+            .flatMap { received ->
+                if (!received.status.found) {
+                    Mono.error(SilentException("Retry not found"))
+                } else {
+                    Mono.just(received)
                 }
-                .flatMap { received ->
-                    if (!received.status.found) {
-                        Mono.error(SilentException("Retry not found"))
-                    } else {
-                        Mono.just(received)
-                    }
-                }
-                .retryWhen(
-                        Retry.fixedDelay(10, Duration.ofSeconds(2))
-                )
-                .onErrorResume { Mono.empty() }
+            }
+            .retryWhen(
+                Retry.fixedDelay(10, Duration.ofSeconds(2))
+            )
+            .onErrorResume { Mono.empty() }
 
         val inBlocks = up.getHead().getFlux()
-                .subscribeOn(scheduler)
-                .flatMap { block ->
-                    onNewBlock(latestTx, block)
-                }
+            .subscribeOn(scheduler)
+            .flatMap { block ->
+                onNewBlock(latestTx, block)
+            }
 
         return Flux.merge(untilFound, inBlocks)
-                .takeUntil(TxDetails::shouldClose)
-                .doOnNext { newTx ->
-                    latestTx = newTx
-                }
+            .takeUntil(TxDetails::shouldClose)
+            .doOnNext { newTx ->
+                latestTx = newTx
+            }
     }
 
     fun onNewBlock(tx: TxDetails, block: BlockContainer): Mono<TxDetails> {
@@ -134,7 +133,8 @@ class TrackEthereumTx(
         if (!tx.status.mined) {
             val justMined = block.transactions.contains(txid)
             return if (justMined) {
-                Mono.just(tx.withStatus(
+                Mono.just(
+                    tx.withStatus(
                         mined = true,
                         found = true,
                         confirmations = 1,
@@ -142,13 +142,14 @@ class TrackEthereumTx(
                         blockTime = block.timestamp,
                         blockTotalDifficulty = block.difficulty,
                         blockHash = BlockHash(block.hash.value)
-                ))
+                    )
+                )
             } else {
                 update(tx)
             }
         } else {
-            //verify if it's still on chain
-            //TODO head is supposed to erase block when it was replaced, so can safely recalc here
+            // verify if it's still on chain
+            // TODO head is supposed to erase block when it was replaced, so can safely recalc here
             return update(tx)
         }
     }
@@ -157,19 +158,19 @@ class TrackEthereumTx(
         val initialStatus = tx.status
         val upstream = getUpstream(tx.chain)
         return upstream.getReader()
-                .txByHash().read(tx.txid)
-                .onErrorResume(RpcException::class.java) { t ->
-                    log.warn("Upstream error, ignoring. {}", t.rpcMessage)
-                    Mono.empty<TransactionJson>()
-                }
-                .flatMap { updateFromBlock(upstream, tx, it) }
-                .doOnError { t ->
-                    log.error("Failed to load tx block", t)
-                }
-                .switchIfEmpty(Mono.just(tx.withStatus(found = false)))
-                .filter { current ->
-                    initialStatus != current.status || current.shouldClose()
-                }
+            .txByHash().read(tx.txid)
+            .onErrorResume(RpcException::class.java) { t ->
+                log.warn("Upstream error, ignoring. {}", t.rpcMessage)
+                Mono.empty<TransactionJson>()
+            }
+            .flatMap { updateFromBlock(upstream, tx, it) }
+            .doOnError { t ->
+                log.error("Failed to load tx block", t)
+            }
+            .switchIfEmpty(Mono.just(tx.withStatus(found = false)))
+            .filter { current ->
+                initialStatus != current.status || current.shouldClose()
+            }
     }
 
     fun prepareTracking(request: BlockchainOuterClass.TxStatusRequest): TxDetails {
@@ -178,10 +179,10 @@ class TrackEthereumTx(
             throw SilentException.UnsupportedBlockchain(request.chainValue)
         }
         val details = TxDetails(
-                chain,
-                Instant.now(),
-                TransactionId.from(request.txId),
-                min(max(1, request.confirmationLimit), 100)
+            chain,
+            Instant.now(),
+            TransactionId.from(request.txId),
+            min(max(1, request.confirmationLimit), 100)
         )
         return details
     }
@@ -189,12 +190,12 @@ class TrackEthereumTx(
     fun setBlockDetails(tx: TxDetails, block: BlockJson<TransactionRefJson>): TxDetails {
         return if (block.number != null && block.totalDifficulty != null) {
             tx.withStatus(
-                    blockTotalDifficulty = block.totalDifficulty,
-                    blockTime = block.timestamp
+                blockTotalDifficulty = block.totalDifficulty,
+                blockTime = block.timestamp
             )
         } else {
             tx.withStatus(
-                    mined = false
+                mined = false
             )
         }
     }
@@ -205,22 +206,22 @@ class TrackEthereumTx(
             return Mono.empty()
         }
         return upstream.getReader()
-                .blocksByHashParsed().read(tx.status.blockHash)
-                .map { block ->
-                    setBlockDetails(tx, block)
-                }.doOnError { t ->
-                    log.warn("Failed to update weight", t)
-                }
+            .blocksByHashParsed().read(tx.status.blockHash)
+            .map { block ->
+                setBlockDetails(tx, block)
+            }.doOnError { t ->
+                log.warn("Failed to update weight", t)
+            }
     }
 
     fun updateFromBlock(upstream: EthereumMultistream, tx: TxDetails, blockTx: TransactionJson): Mono<TxDetails> {
         return if (blockTx.blockNumber != null && blockTx.blockHash != null && blockTx.blockHash != ZERO_BLOCK) {
             val updated = tx.withStatus(
-                    blockHash = blockTx.blockHash,
-                    height = blockTx.blockNumber,
-                    found = true,
-                    mined = true,
-                    confirmations = 1
+                blockHash = blockTx.blockHash,
+                height = blockTx.blockNumber,
+                found = true,
+                mined = true,
+                confirmations = 1
             )
             upstream.getHead().getFlux().next().map { head ->
                 val height = updated.status.height
@@ -228,72 +229,89 @@ class TrackEthereumTx(
                     updated
                 } else {
                     updated.withStatus(
-                            confirmations = head.height - height + 1
+                        confirmations = head.height - height + 1
                     )
                 }
             }.doOnError { t ->
                 log.error("Unable to load head details", t)
             }.flatMap(this::loadWeight)
         } else {
-            Mono.just(tx.withStatus(
+            Mono.just(
+                tx.withStatus(
                     found = true,
                     mined = false
-            ))
+                )
+            )
         }
     }
 
     private fun asProto(tx: TxDetails): BlockchainOuterClass.TxStatus {
         val data = BlockchainOuterClass.TxStatus.newBuilder()
-                .setTxId(tx.txid.toHex())
-                .setConfirmations(tx.status.confirmations.toInt())
+            .setTxId(tx.txid.toHex())
+            .setConfirmations(tx.status.confirmations.toInt())
 
         data.broadcasted = tx.status.found
         val isMined = tx.status.mined
         data.mined = isMined
         if (isMined) {
             data.setBlock(
-                    Common.BlockInfo.newBuilder()
-                            .setBlockId(tx.status.blockHash!!.toHex().substring(2))
-                            .setTimestamp(tx.status.blockTime!!.toEpochMilli())
-                            .setWeight(ByteString.copyFrom(tx.status.blockTotalDifficulty!!.toByteArray()))
-                            .setHeight(tx.status.height!!)
+                Common.BlockInfo.newBuilder()
+                    .setBlockId(tx.status.blockHash!!.toHex().substring(2))
+                    .setTimestamp(tx.status.blockTime!!.toEpochMilli())
+                    .setWeight(ByteString.copyFrom(tx.status.blockTotalDifficulty!!.toByteArray()))
+                    .setHeight(tx.status.height!!)
             )
         }
         return data.build()
     }
 
-    class TxDetails(val chain: Chain,
-                    val since: Instant,
-                    val txid: TransactionId,
-                    val maxConfirmations: Int,
-                    val status: TxStatus
+    class TxDetails(
+        val chain: Chain,
+        val since: Instant,
+        val txid: TransactionId,
+        val maxConfirmations: Int,
+        val status: TxStatus
     ) {
 
-        constructor(chain: Chain,
-                    since: Instant,
-                    txid: TransactionId,
-                    maxConfirmations: Int) : this(chain, since, txid, maxConfirmations, TxStatus())
+        constructor(
+            chain: Chain,
+            since: Instant,
+            txid: TransactionId,
+            maxConfirmations: Int
+        ) : this(chain, since, txid, maxConfirmations, TxStatus())
 
         fun copy(
-                since: Instant = this.since,
-                status: TxStatus = this.status
+            since: Instant = this.since,
+            status: TxStatus = this.status
         ) = TxDetails(chain, since, txid, maxConfirmations, status)
 
-        fun withStatus(found: Boolean = this.status.found,
-                       height: Long? = this.status.height,
-                       mined: Boolean = this.status.mined,
-                       blockHash: BlockHash? = this.status.blockHash,
-                       blockTime: Instant? = this.status.blockTime,
-                       blockTotalDifficulty: BigInteger? = this.status.blockTotalDifficulty,
-                       confirmations: Long = this.status.confirmations): TxDetails {
-            return copy(status = this.status.copy(found, height, mined, blockHash, blockTime, blockTotalDifficulty, confirmations))
+        fun withStatus(
+            found: Boolean = this.status.found,
+            height: Long? = this.status.height,
+            mined: Boolean = this.status.mined,
+            blockHash: BlockHash? = this.status.blockHash,
+            blockTime: Instant? = this.status.blockTime,
+            blockTotalDifficulty: BigInteger? = this.status.blockTotalDifficulty,
+            confirmations: Long = this.status.confirmations
+        ): TxDetails {
+            return copy(
+                status = this.status.copy(
+                    found,
+                    height,
+                    mined,
+                    blockHash,
+                    blockTime,
+                    blockTotalDifficulty,
+                    confirmations
+                )
+            )
         }
 
         fun shouldClose(): Boolean {
-            return maxConfirmations <= this.status.confirmations
-                    || since.isBefore(Instant.now().minus(TRACK_TTL))
-                    || (!status.found && since.isBefore(Instant.now().minus(NOT_FOUND_TRACK_TTL)))
-                    || (!status.mined && since.isBefore(Instant.now().minus(NOT_MINED_TRACK_TTL)))
+            return maxConfirmations <= this.status.confirmations ||
+                since.isBefore(Instant.now().minus(TRACK_TTL)) ||
+                (!status.found && since.isBefore(Instant.now().minus(NOT_FOUND_TRACK_TTL))) ||
+                (!status.mined && since.isBefore(Instant.now().minus(NOT_MINED_TRACK_TTL)))
         }
 
         override fun toString(): String {
@@ -320,25 +338,27 @@ class TrackEthereumTx(
             result = 31 * result + status.hashCode()
             return result
         }
-
     }
 
-    class TxStatus(val found: Boolean = false,
-                   val height: Long? = null,
-                   val mined: Boolean = false,
-                   val blockHash: BlockHash? = null,
-                   val blockTime: Instant? = null,
-                   val blockTotalDifficulty: BigInteger? = null,
-                   val confirmations: Long = 0) {
+    class TxStatus(
+        val found: Boolean = false,
+        val height: Long? = null,
+        val mined: Boolean = false,
+        val blockHash: BlockHash? = null,
+        val blockTime: Instant? = null,
+        val blockTotalDifficulty: BigInteger? = null,
+        val confirmations: Long = 0
+    ) {
 
-        fun copy(found: Boolean = this.found,
-                 height: Long? = this.height,
-                 mined: Boolean = this.mined,
-                 blockHash: BlockHash? = this.blockHash,
-                 blockTime: Instant? = this.blockTime,
-                 blockTotalDifficulty: BigInteger? = this.blockTotalDifficulty,
-                 confirmation: Long = this.confirmations)
-                = TxStatus(found, height, mined, blockHash, blockTime, blockTotalDifficulty, confirmation)
+        fun copy(
+            found: Boolean = this.found,
+            height: Long? = this.height,
+            mined: Boolean = this.mined,
+            blockHash: BlockHash? = this.blockHash,
+            blockTime: Instant? = this.blockTime,
+            blockTotalDifficulty: BigInteger? = this.blockTotalDifficulty,
+            confirmation: Long = this.confirmations
+        ) = TxStatus(found, height, mined, blockHash, blockTime, blockTotalDifficulty, confirmation)
 
         fun clean() = TxStatus(false, null, false, null, null, null, 0)
 
@@ -369,7 +389,5 @@ class TrackEthereumTx(
         override fun toString(): String {
             return "TxStatus(found=$found, height=$height, mined=$mined, blockHash=$blockHash, blockTime=$blockTime, blockTotalDifficulty=$blockTotalDifficulty, confirmations=$confirmations)"
         }
-
-
     }
-}
+}

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

@@ -22,4 +22,4 @@ import reactor.core.publisher.Flux
 interface TrackTx {
     fun isSupported(chain: Chain): Boolean
     fun subscribe(request: BlockchainOuterClass.TxStatusRequest): Flux<BlockchainOuterClass.TxStatus>
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/startup/ConfiguredUpstreams.kt

@@ -16,7 +16,6 @@
  */
 package io.emeraldpay.dshackle.startup
 
-import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.dshackle.FileResolver
 import io.emeraldpay.dshackle.cache.CachesFactory
 import io.emeraldpay.dshackle.config.UpstreamsConfig
@@ -34,49 +33,48 @@ import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcHttpClient
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcRequest
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcResponse
 import io.emeraldpay.dshackle.upstream.rpcclient.RpcMetrics
+import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.grpc.Chain
 import io.micrometer.core.instrument.Counter
-import org.slf4j.LoggerFactory
-import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.stereotype.Repository
 import io.micrometer.core.instrument.Metrics
 import io.micrometer.core.instrument.Tag
 import io.micrometer.core.instrument.Timer
+import org.slf4j.LoggerFactory
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.stereotype.Repository
 import java.net.URI
-import java.util.*
 import java.util.concurrent.atomic.AtomicInteger
 import javax.annotation.PostConstruct
-import kotlin.collections.HashMap
 
 @Repository
 open class ConfiguredUpstreams(
-        @Autowired private val currentUpstreams: CurrentMultistreamHolder,
-        @Autowired private val fileResolver: FileResolver,
-        @Autowired private val config: UpstreamsConfig,
-        @Autowired private val cachesFactory: CachesFactory
+    @Autowired private val currentUpstreams: CurrentMultistreamHolder,
+    @Autowired private val fileResolver: FileResolver,
+    @Autowired private val config: UpstreamsConfig,
+    @Autowired private val cachesFactory: CachesFactory
 ) {
 
     private val log = LoggerFactory.getLogger(ConfiguredUpstreams::class.java)
     private var seq = AtomicInteger(0)
 
     private val chainNames = mapOf(
-            "ethereum" to Chain.ETHEREUM,
-            "ethereum-classic" to Chain.ETHEREUM_CLASSIC,
-            "eth" to Chain.ETHEREUM,
-            "polygon" to Chain.MATIC,
-            "matic" to Chain.MATIC,
-            "etc" to Chain.ETHEREUM_CLASSIC,
-            "morden" to Chain.TESTNET_MORDEN,
-            "kovan" to Chain.TESTNET_KOVAN,
-            "kovan-testnet" to Chain.TESTNET_KOVAN,
-            "goerli" to Chain.TESTNET_GOERLI,
-            "goerli-testnet" to Chain.TESTNET_GOERLI,
-            "rinkeby" to Chain.TESTNET_RINKEBY,
-            "rinkeby-testnet" to Chain.TESTNET_RINKEBY,
-            "ropsten" to Chain.TESTNET_ROPSTEN,
-            "ropsten-testnet" to Chain.TESTNET_ROPSTEN,
-            "bitcoin" to Chain.BITCOIN,
-            "bitcoin-testnet" to Chain.TESTNET_BITCOIN
+        "ethereum" to Chain.ETHEREUM,
+        "ethereum-classic" to Chain.ETHEREUM_CLASSIC,
+        "eth" to Chain.ETHEREUM,
+        "polygon" to Chain.MATIC,
+        "matic" to Chain.MATIC,
+        "etc" to Chain.ETHEREUM_CLASSIC,
+        "morden" to Chain.TESTNET_MORDEN,
+        "kovan" to Chain.TESTNET_KOVAN,
+        "kovan-testnet" to Chain.TESTNET_KOVAN,
+        "goerli" to Chain.TESTNET_GOERLI,
+        "goerli-testnet" to Chain.TESTNET_GOERLI,
+        "rinkeby" to Chain.TESTNET_RINKEBY,
+        "rinkeby-testnet" to Chain.TESTNET_RINKEBY,
+        "ropsten" to Chain.TESTNET_ROPSTEN,
+        "ropsten-testnet" to Chain.TESTNET_ROPSTEN,
+        "bitcoin" to Chain.BITCOIN,
+        "bitcoin-testnet" to Chain.TESTNET_BITCOIN
     )
 
     @PostConstruct
@@ -95,7 +93,7 @@ open class ConfiguredUpstreams(
                     return@forEach
                 }
                 val options = (up.options ?: UpstreamsConfig.Options())
-                        .merge(defaultOptions[chain] ?: UpstreamsConfig.Options.getDefaults())
+                    .merge(defaultOptions[chain] ?: UpstreamsConfig.Options.getDefaults())
                 when (BlockchainType.from(chain)) {
                     BlockchainType.ETHEREUM -> {
                         buildEthereumUpstream(up.cast(UpstreamsConfig.EthereumConnection::class.java), chain, options)
@@ -135,9 +133,10 @@ open class ConfiguredUpstreams(
 
     fun buildMethods(config: UpstreamsConfig.Upstream<*>, chain: Chain): CallMethods {
         return if (config.methods != null) {
-            ManagedCallMethods(currentUpstreams.getDefaultMethods(chain),
-                    config.methods!!.enabled.map { it.name }.toSet(),
-                    config.methods!!.disabled.map { it.name }.toSet()
+            ManagedCallMethods(
+                currentUpstreams.getDefaultMethods(chain),
+                config.methods!!.enabled.map { it.name }.toSet(),
+                config.methods!!.disabled.map { it.name }.toSet()
             ).also {
                 config.methods!!.enabled.forEach { m ->
                     if (m.quorum != null) {
@@ -150,9 +149,11 @@ open class ConfiguredUpstreams(
         }
     }
 
-    private fun buildBitcoinUpstream(config: UpstreamsConfig.Upstream<UpstreamsConfig.BitcoinConnection>,
-                                     chain: Chain,
-                                     options: UpstreamsConfig.Options) {
+    private fun buildBitcoinUpstream(
+        config: UpstreamsConfig.Upstream<UpstreamsConfig.BitcoinConnection>,
+        chain: Chain,
+        options: UpstreamsConfig.Options
+    ) {
 
         val conn = config.connection!!
         val directApi: Reader<JsonRpcRequest, JsonRpcResponse>? = buildHttpClient(config)
@@ -171,19 +172,24 @@ open class ConfiguredUpstreams(
         }
 
         val methods = buildMethods(config, chain)
-        val upstream = BitcoinRpcUpstream(config.id
-                ?: "bitcoin-${seq.getAndIncrement()}", chain, directApi,
-                options, config.role,
-                QuorumForLabels.QuorumItem(1, config.labels),
-                methods, esplora)
+        val upstream = BitcoinRpcUpstream(
+            config.id
+                ?: "bitcoin-${seq.getAndIncrement()}",
+            chain, directApi,
+            options, config.role,
+            QuorumForLabels.QuorumItem(1, config.labels),
+            methods, esplora
+        )
 
         upstream.start()
         currentUpstreams.update(UpstreamChange(chain, upstream, UpstreamChange.ChangeType.ADDED))
     }
 
-    private fun buildEthereumUpstream(config: UpstreamsConfig.Upstream<UpstreamsConfig.EthereumConnection>,
-                                      chain: Chain,
-                                      options: UpstreamsConfig.Options) {
+    private fun buildEthereumUpstream(
+        config: UpstreamsConfig.Upstream<UpstreamsConfig.EthereumConnection>,
+        chain: Chain,
+        options: UpstreamsConfig.Options
+    ) {
         val conn = config.connection!!
 
         val urls = ArrayList<URI>()
@@ -194,8 +200,8 @@ open class ConfiguredUpstreams(
 
         val wsFactoryApi: EthereumWsFactory? = conn.ws?.let { endpoint ->
             val wsApi = EthereumWsFactory(
-                    endpoint.url,
-                    endpoint.origin ?: URI("http://localhost"),
+                endpoint.url,
+                endpoint.origin ?: URI("http://localhost"),
             )
             wsApi.config = endpoint
             endpoint.basicAuth?.let { auth ->
@@ -208,11 +214,11 @@ open class ConfiguredUpstreams(
         log.info("Using ${chain.chainName} upstream, at ${urls.joinToString()}")
         val ethereumUpstream = if (wsFactoryApi != null && !conn.preferHttp) {
             EthereumWsUpstream(
-                    config.id!!,
-                    chain, wsFactoryApi,
-                    options, config.role,
-                    QuorumForLabels.QuorumItem(1, config.labels),
-                    methods
+                config.id!!,
+                chain, wsFactoryApi,
+                options, config.role,
+                QuorumForLabels.QuorumItem(1, config.labels),
+                methods
             )
         } else {
             val directApi: Reader<JsonRpcRequest, JsonRpcResponse>? = buildHttpClient(config)
@@ -221,11 +227,11 @@ open class ConfiguredUpstreams(
                 return
             }
             EthereumRpcUpstream(
-                    config.id!!,
-                    chain, directApi, wsFactoryApi,
-                    options, config.role,
-                    QuorumForLabels.QuorumItem(1, config.labels),
-                    methods
+                config.id!!,
+                chain, directApi, wsFactoryApi,
+                options, config.role,
+                QuorumForLabels.QuorumItem(1, config.labels),
+                methods
             )
         }
 
@@ -233,23 +239,26 @@ open class ConfiguredUpstreams(
         currentUpstreams.update(UpstreamChange(chain, ethereumUpstream, UpstreamChange.ChangeType.ADDED))
     }
 
-    private fun buildGrpcUpstream(config: UpstreamsConfig.Upstream<UpstreamsConfig.GrpcConnection>, options: UpstreamsConfig.Options) {
+    private fun buildGrpcUpstream(
+        config: UpstreamsConfig.Upstream<UpstreamsConfig.GrpcConnection>,
+        options: UpstreamsConfig.Options
+    ) {
         val endpoint = config.connection!!
         val ds = GrpcUpstreams(
-                config.id!!,
-                endpoint.host!!,
-                endpoint.port ?: 2449,
-                endpoint.auth,
-                fileResolver
+            config.id!!,
+            endpoint.host!!,
+            endpoint.port,
+            endpoint.auth,
+            fileResolver
         ).apply {
             timeout = options.timeout
         }
         log.info("Using ALL CHAINS (gRPC) upstream, at ${endpoint.host}:${endpoint.port}")
         ds.start()
-                .doOnNext {
-                    log.info("Chain ${it.chain} has ${it.type} through gRPC at ${endpoint.host}:${endpoint.port}")
-                }
-                .subscribe(currentUpstreams::update)
+            .doOnNext {
+                log.info("Chain ${it.chain} has ${it.type} through gRPC at ${endpoint.host}:${endpoint.port}")
+            }
+            .subscribe(currentUpstreams::update)
     }
 
     private fun buildHttpClient(config: UpstreamsConfig.Upstream<out UpstreamsConfig.RpcConnection>): JsonRpcHttpClient? {
@@ -262,29 +271,29 @@ open class ConfiguredUpstreams(
                 }
             }
             val metricsTags = listOf(
-                    // "unknown" is not supposed to happen
-                    Tag.of("upstream", config.id ?: "unknown"),
-                    // UNSPECIFIED shouldn't happen too
-                    Tag.of("chain", (chainNames[config.chain ?: ""] ?: Chain.UNSPECIFIED ).chainCode)
+                // "unknown" is not supposed to happen
+                Tag.of("upstream", config.id ?: "unknown"),
+                // UNSPECIFIED shouldn't happen too
+                Tag.of("chain", (chainNames[config.chain ?: ""] ?: Chain.UNSPECIFIED).chainCode)
             )
             val metrics = RpcMetrics(
-                    Timer.builder("upstream.rpc.conn")
-                            .description("Request time through a HTTP JSON RPC connection")
-                            .tags(metricsTags)
-                            .publishPercentileHistogram()
-                            .register(Metrics.globalRegistry),
-                    Counter.builder("upstream.rpc.err")
-                            .description("Errors received on request through HTTP JSON RPC connection")
-                            .tags(metricsTags)
-                            .register(Metrics.globalRegistry)
+                Timer.builder("upstream.rpc.conn")
+                    .description("Request time through a HTTP JSON RPC connection")
+                    .tags(metricsTags)
+                    .publishPercentileHistogram()
+                    .register(Metrics.globalRegistry),
+                Counter.builder("upstream.rpc.err")
+                    .description("Errors received on request through HTTP JSON RPC connection")
+                    .tags(metricsTags)
+                    .register(Metrics.globalRegistry)
             )
             urls.add(endpoint.url)
             JsonRpcHttpClient(
-                    endpoint.url.toString(),
-                    metrics,
-                    conn.rpc?.basicAuth,
-                    tls
+                endpoint.url.toString(),
+                metrics,
+                conn.rpc?.basicAuth,
+                tls
             )
         }
     }
-}
+}

src/main/kotlin/io/emeraldpay/dshackle/startup/QuorumForLabels.kt

@@ -17,9 +17,8 @@
 package io.emeraldpay.dshackle.startup
 
 import io.emeraldpay.dshackle.config.UpstreamsConfig
-import java.util.*
+import java.util.Collections
 import java.util.concurrent.locks.ReentrantReadWriteLock
-import kotlin.collections.ArrayList
 import kotlin.concurrent.read
 import kotlin.concurrent.write
 
@@ -71,7 +70,6 @@ class QuorumForLabels() {
         return nodes.hashCode()
     }
 
-
     /**
      * Details for a single element (upstream, node or aggregation)
      */
@@ -97,8 +95,5 @@ class QuorumForLabels() {
             result = 31 * result + labels.hashCode()
             return result
         }
-
-
     }
-
-}
+}