solution: kotlin code conventions

.gitignore

@@ -1,7 +1,11 @@
 .gradle/
 build/
 out/
-*.iml
 ./dshackle.yaml
 ./upstream.yaml
 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
 

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
 
@@ -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))
     }
@@ -119,5 +120,4 @@ open class Config(
     open fun monitoringConfig(@Autowired mainConfig: MainConfig): MonitoringConfig {
         return mainConfig.monitoring
     }
-
 }

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

@@ -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
 
@@ -62,7 +62,5 @@ class Global {
 
             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
@@ -37,7 +37,7 @@ open class GrpcServer(
 
     private val log = LoggerFactory.getLogger(GrpcServer::class.java)
 
-    private var server: Server? = null;
+    private var server: Server? = null
 
     @PostConstruct
     fun start() {
@@ -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
 
@@ -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
      */

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

@@ -96,5 +96,4 @@ open class TlsSetup(
         }
         return null
     }
-
 }

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

@@ -37,5 +37,4 @@ open class BlockByHeight(
         return heights.read(key)
             .flatMap { blocks.read(it) }
     }
-
 }

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

@@ -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
@@ -138,10 +141,12 @@ 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()
+                        )
                     }
                 }
             }
@@ -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

@@ -27,11 +27,10 @@ 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

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

@@ -76,5 +76,4 @@ class HeightByHashAdding(
     override fun read(key: BlockId): Mono<Long> {
         return delegate.read(key)
     }
-
 }

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

@@ -45,5 +45,4 @@ open class HeightCache(
     fun purge() {
         heights.cleanUp()
     }
-
 }

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

@@ -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()}"
     }
 
     /**

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

@@ -56,7 +56,7 @@ 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> {

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

@@ -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

@@ -16,10 +16,9 @@
 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
 

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

@@ -15,22 +15,17 @@
  */
 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.
@@ -77,5 +72,4 @@ open class TxRedisCache(
     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

@@ -18,5 +18,4 @@ class AccessLogConfig(
             )
         }
     }
-
 }

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/AuthConfigReader.kt

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

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

@@ -17,7 +17,7 @@ package io.emeraldpay.dshackle.config
 
 class CacheConfig {
 
-    var redis: Redis? = null;
+    var redis: Redis? = null
 
     class Redis(
         var host: String = "127.0.0.1",

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/InvalidConfigException.kt

@@ -26,4 +26,4 @@ class InvalidConfigYamlException(
     filename: String,
     mark: Mark,
     message: String
-) : InvalidConfigException("Invalid YAML configuration ${message}, at ${filename}:${mark.line}")
+) : InvalidConfigException("Invalid YAML configuration $message, at $filename:${mark.line}")

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

@@ -73,5 +73,4 @@ class MainConfigReader(
         }
         return config
     }
-
 }

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

@@ -24,6 +24,7 @@ class MonitoringConfig(
         fun default(): MonitoringConfig {
             return MonitoringConfig(true, PrometheusConfig.default())
         }
+
         fun disabled(): MonitoringConfig {
             return MonitoringConfig(false, PrometheusConfig.disabled())
         }
@@ -42,10 +43,10 @@ class MonitoringConfig(
             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

@@ -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

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

@@ -15,9 +15,9 @@
  */
 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>
@@ -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>() {
 
         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"),

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

@@ -23,11 +23,9 @@ 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
@@ -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")
         }
@@ -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()
@@ -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

@@ -88,6 +88,4 @@ class BlockContainer(
         result = 31 * result + hash.hashCode()
         return result
     }
-
-
 }

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

@@ -51,6 +51,4 @@ class BlockId(
             return BlockId(bytes)
         }
     }
-
-
 }

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

@@ -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

@@ -16,8 +16,6 @@
  */
 package io.emeraldpay.dshackle.data
 
-import java.lang.ClassCastException
-
 abstract class SourceContainer(
     val json: ByteArray?,
     private val parsed: Any?
@@ -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

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

@@ -70,6 +70,4 @@ class TxContainer(
         result = 31 * result + hash.hashCode()
         return result
     }
-
-
 }

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

@@ -19,7 +19,6 @@ 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

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

@@ -26,17 +26,15 @@ 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
@@ -76,15 +74,21 @@ 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

@@ -15,7 +15,13 @@
  */
 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
@@ -32,7 +38,8 @@ class AccessHandlerGrpc(
     override fun <ReqT : Any, RespT : Any> interceptCall(
         call: ServerCall<ReqT, RespT>,
         headers: Metadata,
-            next: ServerCallHandler<ReqT, RespT>): ServerCall.Listener<ReqT> {
+        next: ServerCallHandler<ReqT, RespT>
+    ): ServerCall.Listener<ReqT> {
 
         return when (val method = call.methodDescriptor.bareMethodName) {
             "SubscribeHead" -> processSubscribeHead(call, headers, next)
@@ -72,7 +79,8 @@ class AccessHandlerGrpc(
         headers: Metadata,
         next: ServerCallHandler<ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
+        return process(
+            call, headers, next,
             EventsBuilder.SubscribeHead() as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
@@ -84,7 +92,8 @@ class AccessHandlerGrpc(
         next: ServerCallHandler<ReqT, RespT>,
         subscribe: Boolean
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
+        return process(
+            call, headers, next,
             EventsBuilder.SubscribeBalance(subscribe) as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
@@ -95,7 +104,8 @@ class AccessHandlerGrpc(
         headers: Metadata,
         next: ServerCallHandler<ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
+        return process(
+            call, headers, next,
             EventsBuilder.TxStatus() as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
@@ -106,7 +116,8 @@ class AccessHandlerGrpc(
         headers: Metadata,
         next: ServerCallHandler<ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
+        return process(
+            call, headers, next,
             EventsBuilder.NativeCall() as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
@@ -117,19 +128,20 @@ class AccessHandlerGrpc(
         headers: Metadata,
         next: ServerCallHandler<ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
+        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>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
+        return process(
+            call, headers, next,
             EventsBuilder.Describe() as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
@@ -140,7 +152,8 @@ class AccessHandlerGrpc(
         headers: Metadata,
         next: ServerCallHandler<ReqT, RespT>
     ): ServerCall.Listener<ReqT> {
-        return process(call, headers, next,
+        return process(
+            call, headers, next,
             EventsBuilder.Status() as EventsBuilder.RequestReply<*, ReqT, RespT>
         )
     }
@@ -181,5 +194,4 @@ class AccessHandlerGrpc(
             )
         }
     }
-
 }

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

@@ -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()
         }

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
@@ -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 {
 
@@ -41,12 +41,16 @@ class Events {
     }
 
     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,
+        blockchain: Chain,
+        id: UUID,
         // initial request details
         val request: StreamRequestDetails,
         // index of the current response
@@ -55,7 +59,9 @@ class Events {
 
     @JsonInclude(JsonInclude.Include.NON_NULL)
     class SubscribeBalance(
-            blockchain: Chain, id: UUID, subscribe: Boolean,
+        blockchain: Chain,
+        id: UUID,
+        subscribe: Boolean,
         // initial request details
         val request: StreamRequestDetails,
         val balanceRequest: BalanceRequest,
@@ -66,7 +72,8 @@ class Events {
 
     @JsonInclude(JsonInclude.Include.NON_NULL)
     class TxStatus(
-            blockchain: Chain, id: UUID,
+        blockchain: Chain,
+        id: UUID,
         val request: StreamRequestDetails,
         val txStatusRequest: TxStatusRequest,
         val txStatus: TxStatusResponse,
@@ -84,7 +91,9 @@ class Events {
 
     @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,
@@ -104,7 +113,9 @@ class Events {
 
     @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,
@@ -120,7 +131,8 @@ class Events {
 
     @JsonInclude(JsonInclude.Include.NON_NULL)
     class Status(
-            blockchain: Chain, id: UUID,
+        blockchain: Chain,
+        id: UUID,
         val request: StreamRequestDetails
     ) : ChainBase(blockchain, "Status", id, Channel.GRPC)
 

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 {
 
@@ -48,7 +49,7 @@ 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",
@@ -84,7 +85,8 @@ 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 ->
+            return ips.sortedWith(
+                kotlin.Comparator { a, b ->
                     val aLocal = a.isLoopbackAddress || a.isSiteLocalAddress
                     val bLocal = b.isLoopbackAddress || b.isSiteLocalAddress
                     when {
@@ -92,7 +94,8 @@ class EventsBuilder {
                         aLocal -> 1
                         else -> -1
                     }
-            }).firstOrNull()
+                }
+            ).firstOrNull()
         }
 
         private fun clean(s: String): String {
@@ -122,11 +125,13 @@ class EventsBuilder {
             }
             val ip = findBestIp(ips)?.hostAddress ?: ""
             this.requestDetails = this.requestDetails
-                    .copy(remote = Events.Remote(
+                .copy(
+                    remote = Events.Remote(
                         ips = ips.map { it.hostAddress },
                         ip = ip,
                         userAgent = userAgent
-                    ))
+                    )
+                )
         }
 
         override fun start(request: HttpServerRequest) {
@@ -147,11 +152,13 @@ class EventsBuilder {
             }
             val ip = findBestIp(ips)?.hostAddress ?: ""
             this.requestDetails = this.requestDetails
-                    .copy(remote = Events.Remote(
+                .copy(
+                    remote = Events.Remote(
                         ips = ips.map { it.hostAddress },
                         ip = ip,
                         userAgent = userAgent
-                    ))
+                    )
+                )
         }
 
         fun withChain(chain: Int): T {
@@ -161,7 +168,7 @@ class EventsBuilder {
         }
     }
 
-    class SubscribeHead() :
+    class SubscribeHead :
         Base<SubscribeHead>(),
         RequestReply<Events.SubscribeHead, Common.Chain, BlockchainOuterClass.ChainHead> {
 
@@ -212,7 +219,7 @@ class EventsBuilder {
         }
     }
 
-    class TxStatus() :
+    class TxStatus :
         Base<TxStatus>(),
         RequestReply<Events.TxStatus, BlockchainOuterClass.TxStatusRequest, BlockchainOuterClass.TxStatus> {
         private var index = 0
@@ -234,7 +241,6 @@ class EventsBuilder {
         override fun getT(): TxStatus {
             return this
         }
-
     }
 
     class NativeCall :
@@ -276,8 +282,10 @@ class EventsBuilder {
             )
         }
 
-        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,
@@ -361,5 +369,4 @@ class EventsBuilder {
             )
         }
     }
-
 }

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
 
@@ -166,7 +164,11 @@ 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 ->

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)
@@ -55,15 +52,31 @@ 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(),
@@ -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)
@@ -73,7 +72,7 @@ open class WriteRpcJson() {
     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)
     }

src/main/kotlin/io/emeraldpay/dshackle/quorum/AlwaysQuorum.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
 
 open class AlwaysQuorum : CallQuorum {
 

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

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

@@ -16,12 +16,8 @@
  */
 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

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

@@ -16,12 +16,9 @@
  */
 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
 

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
 
 /**

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

@@ -119,7 +119,7 @@ class QuorumRpcReader(
             }
             .doOnNext {
                 if (!it.isResolved() && !it.isFailed()) {
-                        log.debug("No quorum for ${key.method} using [${quorum}]. Error: ${it.getError()?.message ?: ""}")
+                    log.debug("No quorum for ${key.method} using [$quorum]. Error: ${it.getError()?.message ?: ""}")
                 }
             }
             // return nothing if not resolved
@@ -131,7 +131,6 @@ class QuorumRpcReader(
             .switchIfEmpty(defaultResult)
     }
 
-
     class Result(
         val value: ByteArray,
         val quorum: Int

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

@@ -16,12 +16,10 @@
  */
 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
 
@@ -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) {

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

@@ -20,7 +20,6 @@ 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.
@@ -47,5 +46,4 @@ class CompoundReader<K, D>(
             }, 1)
             .next()
     }
-
 }

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

@@ -39,5 +39,4 @@ class RekeyingReader<K, K1, D>(
                 reader.read(it)
             }
     }
-
 }

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

@@ -51,5 +51,4 @@ class RpcReader<T>(
                 }
             }
     }
-
 }

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

@@ -35,5 +35,4 @@ class TransformingReader<K, D0, D>(
     override fun read(key: K): Mono<D> {
         return reader.read(key).map(transformer)
     }
-
 }

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

@@ -31,10 +31,11 @@ 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,
@@ -147,7 +148,10 @@ class BlockchainRpc(
                 trackAddress.find { it.isSupported(chain, asset) }?.let { track ->
                     track.getBalance(request)
                         .doOnNext {
-                                metrics.getBalanceRespMetric.record(System.currentTimeMillis() - startTime, TimeUnit.MILLISECONDS)
+                            metrics.getBalanceRespMetric.record(
+                                System.currentTimeMillis() - startTime,
+                                TimeUnit.MILLISECONDS
+                            )
                         }
                 } ?: Flux.error<BlockchainOuterClass.AddressBalance>(SilentException.UnsupportedBlockchain(chain))
                     .doOnSubscribe {

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

@@ -19,7 +19,9 @@ 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
@@ -51,12 +53,14 @@ class Describe(
                             nodes.getAll().forEach { node ->
                                 val nodeDetails = BlockchainOuterClass.NodeDetails.newBuilder()
                                     .setQuorum(node.quorum)
-                                        .addAllLabels(node.labels.entries.map { label ->
+                                    .addAllLabels(
+                                        node.labels.entries.map { label ->
                                             BlockchainOuterClass.Label.newBuilder()
                                                 .setName(label.key)
                                                 .setValue(label.value)
                                                 .build()
-                                        })
+                                        }
+                                    )
                                 chainDescription.addNodes(nodeDetails)
                             }
                             capabilities.addAll(up.getCapabilities())
@@ -76,5 +80,4 @@ class Describe(
             resp.build()
         }
     }
-
 }

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

@@ -24,5 +24,4 @@ class EthereumAddresses {
             }
         }
     }
-
 }

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

@@ -21,29 +21,31 @@ 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(
@@ -98,7 +100,7 @@ open class NativeCall(
                 result.setErrorMessage(error.message)
             }
         } else {
-            result.setPayload(ByteString.copyFrom(it.result))
+            result.payload = ByteString.copyFrom(it.result)
         }
 
         return result.build()
@@ -135,14 +137,18 @@ open class NativeCall(
         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) {
+            val callSpecificMatcher: Mono<Selector.Matcher> =
+                if (BlockchainType.from(upstream.chain) == BlockchainType.ETHEREUM) {
                     ethereumCallSelectors[chain]?.getMatcher(method, params, upstream.getHead())
                 } else {
                     null
@@ -154,7 +160,7 @@ open class NativeCall(
                     .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
@@ -222,11 +228,13 @@ open class NativeCall(
         return req as List<Any>
     }
 
-    open class CallContext<T>(val id: Int,
+    open class CallContext<T>(
+        val id: Int,
         val upstream: Multistream,
         val matcher: Selector.Matcher,
         val callQuorum: CallQuorum,
-                              val payload: T) {
+        val payload: T
+    ) {
         fun <X> withPayload(payload: X): CallContext<X> {
             return CallContext(id, upstream, matcher, callQuorum, payload)
         }

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

@@ -94,5 +94,4 @@ class NativeSubscribe(
             .setPayload(ByteString.copyFrom(result))
             .build()
     }
-
 }

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

@@ -59,5 +59,4 @@ class StreamHead(
             .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
@@ -74,5 +76,4 @@ class SubscribeStatus(
     }
 
     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
@@ -37,10 +37,8 @@ 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(
@@ -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)
     }
 
     /**
@@ -127,7 +125,12 @@ class TrackBitcoinAddress(
         }
     }
 
-    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 ->
@@ -141,9 +144,11 @@ class TrackBitcoinAddress(
             .map { unspent ->
                 totalUnspent(address, includeUtxo, unspent)
             }
-                .switchIfEmpty(Mono.just(0).map {
+            .switchIfEmpty(
+                Mono.just(0).map {
                     AddressBalance(address, BigInteger.ZERO)
-                })
+                }
+            )
             .onErrorResume { t ->
                 log.error("Failed to get unspent", t)
                 Mono.empty()
@@ -182,13 +187,19 @@ class TrackBitcoinAddress(
             )
     }
 
-    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)
         }
@@ -244,9 +255,11 @@ class TrackBitcoinAddress(
     private fun buildResponse(address: AddressBalance): BlockchainOuterClass.AddressBalance {
         return BlockchainOuterClass.AddressBalance.newBuilder()
             .setBalance(address.balance.toString(10))
-                .setAsset(Common.Asset.newBuilder()
+            .setAsset(
+                Common.Asset.newBuilder()
                     .setChainValue(address.address.chain.id)
-                        .setCode("BTC"))
+                    .setCode("BTC")
+            )
             .setAddress(Common.SingleAddress.newBuilder().setAddress(address.address.address))
             .addAllUtxo(
                 address.utxo.map { utxo ->
@@ -260,7 +273,11 @@ class TrackBitcoinAddress(
             .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))

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
@@ -85,7 +85,15 @@ class TrackBitcoinTx(
     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))
+                TxStatus(
+                    status.txid,
+                    true,
+                    ExtractBlock.getHeight(block),
+                    true,
+                    status.blockHash,
+                    ExtractBlock.getTime(block),
+                    ExtractBlock.getDifficulty(block)
+                )
             }.flatMapMany { tx ->
                 withConfirmations(upstream, tx)
             }
@@ -162,8 +170,10 @@ class TrackBitcoinTx(
         val blockHash: String? = null,
         val blockTime: Instant? = null,
         val blockTotalDifficulty: BigInteger? = null,
-            val confirmations: Long = 0) {
+        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
@@ -11,20 +10,20 @@ 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(
@@ -116,14 +115,17 @@ class TrackERC20Address(
     private fun buildResponse(address: TrackedAddress): BlockchainOuterClass.AddressBalance {
         return BlockchainOuterClass.AddressBalance.newBuilder()
             .setBalance(address.balance!!.toString(10))
-                .setAsset(Common.Asset.newBuilder()
+            .setAsset(
+                Common.Asset.newBuilder()
                     .setChainValue(address.chain.id)
-                        .setCode(address.tokenName.uppercase(Locale.getDefault())))
+                    .setCode(address.tokenName.uppercase(Locale.getDefault()))
+            )
             .setAddress(Common.SingleAddress.newBuilder().setAddress(address.address.toHex()))
             .build()
     }
 
-    class TrackedAddress(val chain: Chain,
+    class TrackedAddress(
+        val chain: Chain,
         val address: Address,
         val token: ERC20Token,
         val tokenName: String,
@@ -134,5 +136,4 @@ class TrackERC20Address(
 
     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

@@ -18,20 +18,20 @@ 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(
@@ -126,14 +126,17 @@ class TrackEthereumAddress(
     private fun buildResponse(address: TrackedAddress): BlockchainOuterClass.AddressBalance {
         return BlockchainOuterClass.AddressBalance.newBuilder()
             .setBalance(address.balance!!.amount!!.toString(10))
-                .setAsset(Common.Asset.newBuilder()
+            .setAsset(
+                Common.Asset.newBuilder()
                     .setChainValue(address.chain.id)
-                        .setCode("ETHER"))
+                    .setCode("ETHER")
+            )
             .setAddress(Common.SingleAddress.newBuilder().setAddress(address.address.toHex()))
             .build()
     }
 
-    class TrackedAddress(val chain: Chain,
+    class TrackedAddress(
+        val chain: Chain,
         val address: Address,
         val balance: Wei? = null
     ) {

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
@@ -82,7 +82,6 @@ class TrackEthereumTx(
             }
     }
 
-
     fun getUpstream(chain: Chain): EthereumMultistream {
         return multistreamHolder.getUpstream(chain)?.cast(EthereumMultistream::class.java)
             ?: throw SilentException.UnsupportedBlockchain(chain)
@@ -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,
@@ -142,7 +142,8 @@ class TrackEthereumTx(
                         blockTime = block.timestamp,
                         blockTotalDifficulty = block.difficulty,
                         blockHash = BlockHash(block.hash.value)
-                ))
+                    )
+                )
             } else {
                 update(tx)
             }
@@ -235,10 +236,12 @@ class TrackEthereumTx(
                 log.error("Unable to load head details", t)
             }.flatMap(this::loadWeight)
         } else {
-            Mono.just(tx.withStatus(
+            Mono.just(
+                tx.withStatus(
                     found = true,
                     mined = false
-            ))
+                )
+            )
         }
     }
 
@@ -262,38 +265,53 @@ class TrackEthereumTx(
         return data.build()
     }
 
-    class TxDetails(val chain: Chain,
+    class TxDetails(
+        val chain: Chain,
         val since: Instant,
         val txid: TransactionId,
         val maxConfirmations: Int,
         val status: TxStatus
     ) {
 
-        constructor(chain: Chain,
+        constructor(
+            chain: Chain,
             since: Instant,
             txid: TransactionId,
-                    maxConfirmations: Int) : this(chain, since, txid, maxConfirmations, TxStatus())
+            maxConfirmations: Int
+        ) : this(chain, since, txid, maxConfirmations, TxStatus())
 
         fun copy(
             since: Instant = this.since,
             status: TxStatus = this.status
         ) = TxDetails(chain, since, txid, maxConfirmations, status)
 
-        fun withStatus(found: Boolean = this.status.found,
+        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))
+            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,
+    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) {
+        val confirmations: Long = 0
+    ) {
 
-        fun copy(found: Boolean = this.found,
+        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)
+            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/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
@@ -34,19 +33,18 @@ 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(
@@ -135,7 +133,8 @@ open class ConfiguredUpstreams(
 
     fun buildMethods(config: UpstreamsConfig.Upstream<*>, chain: Chain): CallMethods {
         return if (config.methods != null) {
-            ManagedCallMethods(currentUpstreams.getDefaultMethods(chain),
+            ManagedCallMethods(
+                currentUpstreams.getDefaultMethods(chain),
                 config.methods!!.enabled.map { it.name }.toSet(),
                 config.methods!!.disabled.map { it.name }.toSet()
             ).also {
@@ -150,9 +149,11 @@ open class ConfiguredUpstreams(
         }
     }
 
-    private fun buildBitcoinUpstream(config: UpstreamsConfig.Upstream<UpstreamsConfig.BitcoinConnection>,
+    private fun buildBitcoinUpstream(
+        config: UpstreamsConfig.Upstream<UpstreamsConfig.BitcoinConnection>,
         chain: Chain,
-                                     options: UpstreamsConfig.Options) {
+        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-${seq.getAndIncrement()}", chain, directApi,
+        val upstream = BitcoinRpcUpstream(
+            config.id
+                ?: "bitcoin-${seq.getAndIncrement()}",
+            chain, directApi,
             options, config.role,
             QuorumForLabels.QuorumItem(1, config.labels),
-                methods, esplora)
+            methods, esplora
+        )
 
         upstream.start()
         currentUpstreams.update(UpstreamChange(chain, upstream, UpstreamChange.ChangeType.ADDED))
     }
 
-    private fun buildEthereumUpstream(config: UpstreamsConfig.Upstream<UpstreamsConfig.EthereumConnection>,
+    private fun buildEthereumUpstream(
+        config: UpstreamsConfig.Upstream<UpstreamsConfig.EthereumConnection>,
         chain: Chain,
-                                      options: UpstreamsConfig.Options) {
+        options: UpstreamsConfig.Options
+    ) {
         val conn = config.connection!!
 
         val urls = ArrayList<URI>()
@@ -233,12 +239,15 @@ 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.port,
             endpoint.auth,
             fileResolver
         ).apply {

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
         }
-
-
     }
-
 }

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

@@ -22,5 +22,4 @@ interface ApiSource : Publisher<Upstream> {
 
     fun resolve()
     fun request(tries: Int)
-
 }

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

@@ -16,26 +16,24 @@
  */
 package io.emeraldpay.dshackle.upstream
 
-import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.dshackle.cache.CachesEnabled
 import io.emeraldpay.dshackle.cache.CachesFactory
 import io.emeraldpay.dshackle.startup.UpstreamChange
 import io.emeraldpay.dshackle.upstream.bitcoin.BitcoinMultistream
-import io.emeraldpay.dshackle.upstream.bitcoin.BitcoinRpcUpstream
 import io.emeraldpay.dshackle.upstream.bitcoin.BitcoinUpstream
-import io.emeraldpay.dshackle.upstream.calls.DefaultBitcoinMethods
 import io.emeraldpay.dshackle.upstream.calls.CallMethods
+import io.emeraldpay.dshackle.upstream.calls.DefaultBitcoinMethods
 import io.emeraldpay.dshackle.upstream.calls.DefaultEthereumMethods
 import io.emeraldpay.dshackle.upstream.ethereum.EthereumMultistream
 import io.emeraldpay.dshackle.upstream.ethereum.EthereumUpstream
+import io.emeraldpay.grpc.BlockchainType
 import io.emeraldpay.grpc.Chain
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.scheduling.annotation.Scheduled
 import org.springframework.stereotype.Repository
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Sinks
-import java.util.*
+import java.util.Collections
 import java.util.concurrent.Callable
 import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.locks.ReentrantLock
@@ -63,17 +61,17 @@ open class CurrentMultistreamHolder(
                 when (BlockchainType.from(chain)) {
                     BlockchainType.ETHEREUM -> {
                         val up = change.upstream.cast(EthereumUpstream::class.java)
-                        val current = chainMapping[chain] as Multistream?
-                        val factory = Callable {
-                            EthereumMultistream(chain, ArrayList(), cachesFactory.getCaches(chain)) as Multistream
+                        val current = chainMapping[chain]
+                        val factory = Callable<Multistream> {
+                            EthereumMultistream(chain, ArrayList(), cachesFactory.getCaches(chain))
                         }
                         processUpdate(change, up, current, factory)
                     }
                     BlockchainType.BITCOIN -> {
                         val up = change.upstream.cast(BitcoinUpstream::class.java)
-                        val current = chainMapping[chain] as Multistream?
-                        val factory = Callable {
-                            BitcoinMultistream(chain, ArrayList(), cachesFactory.getCaches(chain)) as Multistream
+                        val current = chainMapping[chain]
+                        val factory = Callable<Multistream> {
+                            BitcoinMultistream(chain, ArrayList(), cachesFactory.getCaches(chain))
                         }
                         processUpdate(change, up, current, factory)
                     }

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

@@ -34,10 +34,29 @@ abstract class DefaultUpstream(
     private val node: QuorumForLabels.QuorumItem?
 ) : Upstream {
 
-    constructor(id: String, options: UpstreamsConfig.Options, role: UpstreamsConfig.UpstreamRole, targets: CallMethods?) :
-            this(id, Long.MAX_VALUE, UpstreamAvailability.UNAVAILABLE, options, role, targets, QuorumForLabels.QuorumItem.empty())
+    constructor(
+        id: String,
+        options: UpstreamsConfig.Options,
+        role: UpstreamsConfig.UpstreamRole,
+        targets: CallMethods?
+    ) :
+        this(
+            id,
+            Long.MAX_VALUE,
+            UpstreamAvailability.UNAVAILABLE,
+            options,
+            role,
+            targets,
+            QuorumForLabels.QuorumItem.empty()
+        )
 
-    constructor(id: String, options: UpstreamsConfig.Options, role: UpstreamsConfig.UpstreamRole, targets: CallMethods?, node: QuorumForLabels.QuorumItem?) :
+    constructor(
+        id: String,
+        options: UpstreamsConfig.Options,
+        role: UpstreamsConfig.UpstreamRole,
+        targets: CallMethods?,
+        node: QuorumForLabels.QuorumItem?
+    ) :
         this(id, Long.MAX_VALUE, UpstreamAvailability.UNAVAILABLE, options, role, targets, node)
 
     private val status = AtomicReference(Status(defaultLag, defaultAvail, statusByLag(defaultLag, defaultAvail)))
@@ -107,7 +126,7 @@ abstract class DefaultUpstream(
     }
 
     override fun getRole(): UpstreamsConfig.UpstreamRole {
-        return role;
+        return role
     }
 
     override fun getMethods(): CallMethods {

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

@@ -17,7 +17,6 @@
 package io.emeraldpay.dshackle.upstream
 
 import io.emeraldpay.dshackle.data.BlockContainer
-import io.emeraldpay.dshackle.upstream.Head
 import reactor.core.publisher.Flux
 
 class EmptyHead : Head {

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

@@ -26,7 +26,7 @@ import org.reactivestreams.Subscriber
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Sinks
 import java.time.Duration
-import java.util.*
+import java.util.EnumMap
 import java.util.concurrent.locks.Lock
 import java.util.concurrent.locks.ReentrantLock
 import kotlin.concurrent.withLock
@@ -68,14 +68,18 @@ class FilteredApis(
         private val metricsSetup: Lock = ReentrantLock()
     }
 
-    constructor(chain: Chain,
+    constructor(
+        chain: Chain,
         allUpstreams: List<Upstream>,
         matcher: Selector.Matcher,
-                pos: Int) : this(chain, allUpstreams, matcher, pos, 10, 7)
+        pos: Int
+    ) : this(chain, allUpstreams, matcher, pos, 10, 7)
 
-    constructor(chain: Chain,
+    constructor(
+        chain: Chain,
         allUpstreams: List<Upstream>,
-                matcher: Selector.Matcher) : this(chain, allUpstreams, matcher, 0, 10, 10)
+        matcher: Selector.Matcher
+    ) : this(chain, allUpstreams, matcher, 0, 10, 10)
 
     private val delay: Int
     private val standardUpstreams: List<Upstream>

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

@@ -18,7 +18,6 @@ package io.emeraldpay.dshackle.upstream
 
 import io.emeraldpay.dshackle.data.BlockContainer
 import reactor.core.publisher.Flux
-import reactor.core.publisher.Mono
 
 /**
  * Subscription to listen to updates to the head of a blockchain.

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

@@ -93,5 +93,4 @@ abstract class HeadLagObserver(
     }
 
     abstract fun forkDistance(top: BlockContainer, curr: BlockContainer): Long
-
 }

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

@@ -59,5 +59,4 @@ class MergedHead(
             }
         }
     }
-
 }

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

@@ -16,7 +16,7 @@
  */
 package io.emeraldpay.dshackle.upstream
 
-import io.emeraldpay.dshackle.cache.*
+import io.emeraldpay.dshackle.cache.Caches
 import io.emeraldpay.dshackle.config.UpstreamsConfig
 import io.emeraldpay.dshackle.reader.Reader
 import io.emeraldpay.dshackle.upstream.calls.AggregatedCallMethods
@@ -33,10 +33,9 @@ import org.springframework.context.Lifecycle
 import reactor.core.Disposable
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
-import reactor.core.scheduler.Schedulers
 import java.time.Duration
 import java.time.Instant
-import java.util.*
+import java.util.Locale
 import java.util.concurrent.atomic.AtomicReference
 import java.util.concurrent.locks.ReentrantLock
 import java.util.function.Predicate
@@ -70,14 +69,19 @@ abstract class Multistream(
 
     init {
         UpstreamAvailability.values().forEach { status ->
-            Metrics.gauge("$metrics.availability",
-                    listOf(Tag.of("chain", chain.chainCode), Tag.of("status", status.name.lowercase(Locale.getDefault()))), this) {
+            Metrics.gauge(
+                "$metrics.availability",
+                listOf(Tag.of("chain", chain.chainCode), Tag.of("status", status.name.lowercase(Locale.getDefault()))),
+                this
+            ) {
                 upstreams.count { it.getStatus() == status }.toDouble()
             }
         }
 
-        Metrics.gauge("$metrics.connected",
-                listOf(Tag.of("chain", chain.chainCode)), this) {
+        Metrics.gauge(
+            "$metrics.connected",
+            listOf(Tag.of("chain", chain.chainCode)), this
+        ) {
             upstreams.size.toDouble()
         }
 
@@ -87,8 +91,10 @@ abstract class Multistream(
     }
 
     private fun monitorUpstream(upstream: Upstream) {
-        Metrics.gauge("$metrics.lag",
-                listOf(Tag.of("chain", chain.chainCode), Tag.of("upstream", upstream.getId())), upstream) {
+        Metrics.gauge(
+            "$metrics.lag",
+            listOf(Tag.of("chain", chain.chainCode), Tag.of("upstream", upstream.getId())), upstream
+        ) {
             it.getLag().toDouble()
         }
     }
@@ -140,7 +146,12 @@ abstract class Multistream(
         apis.request(1)
         return Mono.from(apis)
             .map(Upstream::getApi)
-                .map { RequestPostprocessor.wrap(it, postprocessor) } //TODO do it on upstream init, not each time it's called
+            .map {
+                RequestPostprocessor.wrap(
+                    it,
+                    postprocessor
+                )
+            } // TODO do it on upstream init, not each time it's called
             .switchIfEmpty(Mono.error(Exception("No API available for $chain")))
     }
 
@@ -292,15 +303,15 @@ abstract class Multistream(
 
     class UpstreamStatus(val upstream: Upstream, val status: UpstreamAvailability, val ts: Instant = Instant.now())
 
-    class FilterBestAvailability() : Predicate<UpstreamStatus> {
+    class FilterBestAvailability : Predicate<UpstreamStatus> {
         private val lastRef = AtomicReference<UpstreamStatus>()
 
         override fun test(t: UpstreamStatus): Boolean {
             val curr = lastRef.updateAndGet { last ->
-                val changed = last == null
-                        || t.status < last.status
-                        || (last.upstream == t.upstream && t.status != last.status)
-                        || last.ts.isBefore(t.ts - Duration.ofSeconds(60))
+                val changed = last == null ||
+                    t.status < last.status ||
+                    (last.upstream == t.upstream && t.status != last.status) ||
+                    last.ts.isBefore(t.ts - Duration.ofSeconds(60))
                 if (changed) {
                     t
                 } else {
@@ -310,5 +321,4 @@ abstract class Multistream(
             return curr == t
         }
     }
-
 }

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

@@ -14,7 +14,10 @@ interface RequestPostprocessor {
     }
 
     companion object {
-        fun wrap(reader: Reader<JsonRpcRequest, JsonRpcResponse>, processor: RequestPostprocessor): Reader<JsonRpcRequest, JsonRpcResponse> {
+        fun wrap(
+            reader: Reader<JsonRpcRequest, JsonRpcResponse>,
+            processor: RequestPostprocessor
+        ): Reader<JsonRpcRequest, JsonRpcResponse> {
             return Wrapper(reader, processor)
         }
     }
@@ -33,6 +36,5 @@ interface RequestPostprocessor {
                     }
                 }
         }
-
     }
 }

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

@@ -19,8 +19,7 @@ package io.emeraldpay.dshackle.upstream
 import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.dshackle.config.UpstreamsConfig
 import org.apache.commons.lang3.StringUtils
-import java.util.*
-import kotlin.collections.ArrayList
+import java.util.Collections
 
 class Selector {
 
@@ -47,8 +46,24 @@ class Selector {
                         AnyLabelMatcher()
                     }
                 }
-                req.hasAndSelector() -> AndMatcher(Collections.unmodifiableCollection(req.andSelector.selectorsList.map { convertToMatcher(it) }))
-                req.hasOrSelector() -> OrMatcher(Collections.unmodifiableCollection(req.orSelector.selectorsList.map { convertToMatcher(it) }))
+                req.hasAndSelector() -> AndMatcher(
+                    Collections.unmodifiableCollection(
+                        req.andSelector.selectorsList.map {
+                            convertToMatcher(
+                                it
+                            )
+                        }
+                    )
+                )
+                req.hasOrSelector() -> OrMatcher(
+                    Collections.unmodifiableCollection(
+                        req.orSelector.selectorsList.map {
+                            convertToMatcher(
+                                it
+                            )
+                        }
+                    )
+                )
                 req.hasNotSelector() -> NotMatcher(convertToMatcher(req.notSelector.selector))
                 req.hasExistsSelector() -> ExistsMatcher(req.existsSelector.name)
                 else -> AnyLabelMatcher()
@@ -319,7 +334,7 @@ class Selector {
         }
 
         override fun describeInternal(): String {
-            return "label '${name}' exists"
+            return "label '$name' exists"
         }
 
         override fun toString(): String {
@@ -341,7 +356,7 @@ class Selector {
         }
     }
 
-    class GrpcMatcher() : Matcher {
+    class GrpcMatcher : Matcher {
         override fun matches(up: Upstream): Boolean {
             return up.isGrpc()
         }

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

@@ -22,7 +22,6 @@ import io.emeraldpay.dshackle.upstream.calls.CallMethods
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcRequest
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcResponse
 import reactor.core.publisher.Flux
-import reactor.core.publisher.Mono
 
 interface Upstream {
     fun isAvailable(): Boolean

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

@@ -22,18 +22,22 @@ enum class UpstreamAvailability(val grpcId: Int) {
      * Active fully synchronized node
      */
     OK(1),
+
     /**
      * Good node, but is still synchronizing to a latest block
      */
     LAGGING(2),
+
     /**
      * May be good, but node doesn't have enough peers to be sure it's on corrected chain
      */
     IMMATURE(3),
+
     /**
      * Node is doing it's initial synchronization, is behind by at least several blocks
      */
     SYNCING(4),
+
     /**
      * Unavailable node
      */

src/main/kotlin/io/emeraldpay/dshackle/upstream/bitcoin/AddressActiveCheck.kt

@@ -31,5 +31,4 @@ open class AddressActiveCheck(
         // TODO cache with bloom filter
         return esploraClient.getTransactions(address).map { it.isNotEmpty() }
     }
-
 }

src/main/kotlin/io/emeraldpay/dshackle/upstream/bitcoin/BitcoinHeadLagObserver.kt

@@ -34,5 +34,4 @@ class BitcoinHeadLagObserver(
         // TODO fetch actual blocks
         return 3
     }
-
 }

src/main/kotlin/io/emeraldpay/dshackle/upstream/bitcoin/BitcoinMultistream.kt

@@ -19,7 +19,13 @@ import io.emeraldpay.dshackle.cache.Caches
 import io.emeraldpay.dshackle.config.UpstreamsConfig
 import io.emeraldpay.dshackle.reader.EmptyReader
 import io.emeraldpay.dshackle.reader.Reader
-import io.emeraldpay.dshackle.upstream.*
+import io.emeraldpay.dshackle.upstream.EmptyHead
+import io.emeraldpay.dshackle.upstream.Head
+import io.emeraldpay.dshackle.upstream.MergedHead
+import io.emeraldpay.dshackle.upstream.Multistream
+import io.emeraldpay.dshackle.upstream.RequestPostprocessor
+import io.emeraldpay.dshackle.upstream.Selector
+import io.emeraldpay.dshackle.upstream.Upstream
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcRequest
 import io.emeraldpay.dshackle.upstream.rpcclient.JsonRpcResponse
 import io.emeraldpay.grpc.Chain

src/main/kotlin/io/emeraldpay/dshackle/upstream/bitcoin/BitcoinRpcHead.kt

@@ -39,7 +39,8 @@ class BitcoinRpcHead(
 
     companion object {
         private val log = LoggerFactory.getLogger(BitcoinRpcHead::class.java)
-        val scheduler = Schedulers.fromExecutor(Executors.newCachedThreadPool(CustomizableThreadFactory("bitcoin-rpc-head")))
+        val scheduler =
+            Schedulers.fromExecutor(Executors.newCachedThreadPool(CustomizableThreadFactory("bitcoin-rpc-head")))
     }
 
     private var refreshSubscription: Disposable? = null
@@ -78,5 +79,4 @@ class BitcoinRpcHead(
         refreshSubscription = null
         copy?.dispose()
     }
-
 }