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solution: correctly account for upstream lag

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This commit is contained in:
Igor Artamonov
2019-08-09 00:29:26 -04:00
parent 7f9478d538
commit 7205a33ff3
12 changed files with 340 additions and 59 deletions
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24
src/main/kotlin/io/emeraldpay/dshackle/upstream/ChainUpstreams.kt
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@@ -15,6 +15,7 @@ class ChainUpstreams (
private val log = LoggerFactory.getLogger(ChainUpstreams::class.java)
private var seq = 0
private var head: EthereumHead?
private var lagObserver: HeadLagObserver? = null
init {
head = updateHead()
@@ -28,10 +29,18 @@ class ChainUpstreams (
if (current != null && Closeable::class.java.isAssignableFrom(current.javaClass)) {
(current as Closeable).close()
}
lagObserver?.close()
lagObserver = null
return if (upstreams.size == 1) {
upstreams.first().getHead()
val upstream = upstreams.first()
upstream.setLag(0)
upstream.getHead()
} else {
EthereumHeadMerge(upstreams.map { it.getHead() })
val newHead = EthereumHeadMerge(upstreams.map { it.getHead() })
val lagObserver = HeadLagObserver(newHead, upstreams)
lagObserver.start()
this.lagObserver = lagObserver
newHead
}
}
@@ -60,6 +69,13 @@ class ChainUpstreams (
return head!!
}
override fun setLag(lag: Long) {
}
override fun getLag(): Long {
return 0
}
fun printStatus() {
var height: Long? = null
try {
@@ -73,8 +89,10 @@ class ChainUpstreams (
.groupBy { it }
.map { "${it.key.name}/${it.value.size}" }
.joinToString(",")
val lag = upstreams.map { it.getLag() }
.joinToString(", ")
log.info("State of ${chain.chainCode}: height=${height ?: '?'}, status=$statuses")
log.info("State of ${chain.chainCode}: height=${height ?: '?'}, status=$statuses, lag=[$lag]")
}

3
src/main/kotlin/io/emeraldpay/dshackle/upstream/ConfiguredUpstreams.kt
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@@ -16,6 +16,7 @@ import reactor.core.publisher.toFlux
import java.io.File
import java.net.URI
import java.util.*
import java.util.concurrent.ConcurrentHashMap
import javax.annotation.PostConstruct
import kotlin.collections.HashMap
@@ -27,7 +28,7 @@ open class ConfiguredUpstreams(
) : Upstreams {
private val log = LoggerFactory.getLogger(ConfiguredUpstreams::class.java)
private val chainMapping = HashMap<Chain, ChainUpstreams>()
private val chainMapping = ConcurrentHashMap<Chain, ChainUpstreams>()
private val chainNames = mapOf(
"ethereum" to Chain.ETHEREUM,

56
src/main/kotlin/io/emeraldpay/dshackle/upstream/DefaultUpstream.kt Normal file
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@@ -0,0 +1,56 @@
package io.emeraldpay.dshackle.upstream
import reactor.core.publisher.Flux
import reactor.core.publisher.TopicProcessor
import java.util.concurrent.atomic.AtomicReference
abstract class DefaultUpstream(
lag: Long,
avail: UpstreamAvailability
) : Upstream {
constructor() : this(Long.MAX_VALUE, UpstreamAvailability.UNAVAILABLE)
private val status = AtomicReference(Status(lag, avail, statusByLag(lag, avail)))
private val statusStream: TopicProcessor<UpstreamAvailability> = TopicProcessor.create()
override fun getStatus(): UpstreamAvailability {
return status.get().status
}
fun setStatus(avail: UpstreamAvailability) {
status.updateAndGet { curr ->
Status(curr.lag, avail, statusByLag(curr.lag, avail))
}
}
fun statusByLag(lag: Long, proposed: UpstreamAvailability): UpstreamAvailability {
return if (proposed == UpstreamAvailability.OK) {
when {
lag > 6 -> UpstreamAvailability.SYNCING
lag > 1 -> UpstreamAvailability.LAGGING
else -> proposed
}
} else proposed
}
override fun observeStatus(): Flux<UpstreamAvailability> {
return Flux.from(statusStream)
}
override fun setLag(lag: Long) {
if (lag < 0) {
setLag(0)
} else {
status.updateAndGet { curr ->
Status(lag, curr.avail, statusByLag(lag, curr.avail))
}
}
}
override fun getLag(): Long {
return this.status.get().lag
}
class Status(val lag: Long, val avail: UpstreamAvailability, val status: UpstreamAvailability)
}

25
src/main/kotlin/io/emeraldpay/dshackle/upstream/EthereumUpstream.kt
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@@ -7,6 +7,7 @@ import io.infinitape.etherjar.rpc.json.BlockJson
import org.slf4j.LoggerFactory
import reactor.core.publisher.Flux
import reactor.core.publisher.TopicProcessor
import java.util.concurrent.atomic.AtomicLong
import java.util.concurrent.atomic.AtomicReference
open class EthereumUpstream(
@@ -16,7 +17,7 @@ open class EthereumUpstream(
private val options: UpstreamsConfig.Options,
val node: NodeDetailsList.NodeDetails,
private val targets: EthereumTargets
): Upstream {
): DefaultUpstream() {
override fun getSupportedTargets(): Set<String> {
return targets.getSupportedMethods()
@@ -33,34 +34,17 @@ open class EthereumUpstream(
}
private val validator = UpstreamValidator(this, options)
private val status = AtomicReference(UpstreamAvailability.UNAVAILABLE)
private val statusStream: TopicProcessor<UpstreamAvailability> = TopicProcessor.create()
init {
log.info("Configured for ${chain.chainName}")
api.upstream = this
validator.start()
.subscribe {
status.set(it)
statusStream.onNext(it)
}
.subscribe(this::setStatus)
}
override fun isAvailable(matcher: Selector.Matcher): Boolean {
return status.get() == UpstreamAvailability.OK && matcher.matches(node.labels)
}
override fun getStatus(): UpstreamAvailability {
return status.get()
}
fun setStatus(avail: UpstreamAvailability) {
status.set(avail)
}
override fun observeStatus(): Flux<UpstreamAvailability> {
return Flux.from(statusStream)
return getStatus() == UpstreamAvailability.OK && matcher.matches(node.labels)
}
override fun getHead(): EthereumHead {
@@ -78,4 +62,5 @@ open class EthereumUpstream(
override fun getOptions(): UpstreamsConfig.Options {
return options
}
}

15
src/main/kotlin/io/emeraldpay/dshackle/upstream/GrpcUpstream.kt
View File

@@ -30,7 +30,7 @@ open class GrpcUpstream(
private val objectMapper: ObjectMapper,
private val options: UpstreamsConfig.Options,
private val targets: EthereumTargets
): Upstream {
): DefaultUpstream() {
constructor(chain: Chain, client: ReactorBlockchainGrpc.ReactorBlockchainStub, objectMapper: ObjectMapper, targets: EthereumTargets)
: this(chain, client, objectMapper, UpstreamsConfig.Options.getDefaults(), targets)
@@ -123,11 +123,6 @@ open class GrpcUpstream(
)
}
private fun setStatus(value: UpstreamAvailability) {
status.set(value)
statusStream.onNext(value)
}
fun getNodes(): NodeDetailsList {
return nodes.get()
}
@@ -144,14 +139,6 @@ open class GrpcUpstream(
}
}
override fun getStatus(): UpstreamAvailability {
return status.get()
}
override fun observeStatus(): Flux<UpstreamAvailability> {
return Flux.from(statusStream)
}
override fun getHead(): EthereumHead {
return head
}

77
src/main/kotlin/io/emeraldpay/dshackle/upstream/HeadLagObserver.kt Normal file
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@@ -0,0 +1,77 @@
package io.emeraldpay.dshackle.upstream
import io.infinitape.etherjar.domain.TransactionId
import io.infinitape.etherjar.rpc.json.BlockJson
import org.slf4j.LoggerFactory
import reactor.core.Disposable
import reactor.core.publisher.Flux
import reactor.core.publisher.toFlux
import reactor.util.function.Tuple2
import reactor.util.function.Tuples
import java.io.Closeable
import java.time.Duration
class HeadLagObserver (
private val master: EthereumHead,
private val followers: Collection<Upstream>
): Closeable {
private val log = LoggerFactory.getLogger(HeadLagObserver::class.java)
private var current: Disposable? = null
fun start() {
current = subscription().subscribe { }
}
private fun subscription(): Flux<Unit> {
return master.getFlux()
.flatMap(this::probeFollowers)
.map { item ->
item.t2.setLag(item.t1)
}
}
fun probeFollowers(top: BlockJson<TransactionId>): Flux<Tuple2<Long, Upstream>> {
return followers.toFlux()
.parallel(followers.size)
.flatMap { mapLagging(top, it, getCurrentBlocks(it)) }
.sequential()
.onErrorContinue { t, _ -> log.warn("Failed to update lagging distance", t) }
}
fun getCurrentBlocks(up: Upstream): Flux<BlockJson<TransactionId>> {
val head = up.getHead()
return Flux.concat(head.getHead(), head.getFlux())
.take(Duration.ofSeconds(1))
}
fun mapLagging(top: BlockJson<TransactionId>, up: Upstream, blocks: Flux<BlockJson<TransactionId>>): Flux<Tuple2<Long, Upstream>> {
return blocks
.map { extractDistance(top, it) }
.takeUntil{ lag -> lag <= 0L }
.map { Tuples.of(it, up) }
.doOnError { t ->
log.warn("Failed to find distance for $up", t)
}
}
fun extractDistance(top: BlockJson<TransactionId>, curr: BlockJson<TransactionId>): Long {
return when {
curr.number > top.number -> if (curr.totalDifficulty >= top.totalDifficulty) 0 else forkDistance(top, curr)
curr.number == top.number -> if (curr.totalDifficulty == top.totalDifficulty) 0 else forkDistance(top, curr)
else -> top.number - curr.number
}
}
fun forkDistance(top: BlockJson<TransactionId>, curr: BlockJson<TransactionId>): Long {
//TODO look for common ancestor? though it may be a corruption
return 6
}
override fun close() {
current?.dispose()
current = null
}
}

30
src/main/kotlin/io/emeraldpay/dshackle/upstream/NotLaggingQuorum.kt
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@@ -2,44 +2,32 @@ package io.emeraldpay.dshackle.upstream
import io.infinitape.etherjar.domain.TransactionId
import io.infinitape.etherjar.rpc.json.BlockJson
import org.slf4j.LoggerFactory
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono
import java.util.concurrent.atomic.AtomicReference
import java.util.concurrent.locks.ReentrantLock
import kotlin.concurrent.withLock
class NotLaggingQuorum(val maxLag: Long = 0): CallQuorum {
private var head: Flux<BlockJson<TransactionId>> = Flux.empty<BlockJson<TransactionId>>()
private val lock = ReentrantLock()
private var resolved = false
private var result: ByteArray? = null
private val result: AtomicReference<ByteArray> = AtomicReference()
override fun init(head: Head<BlockJson<TransactionId>>) {
this.head = head.getFlux()
}
override fun isResolved(): Boolean {
return resolved && result != null
return result.get() != null
}
override fun record(response: ByteArray, upstream: Upstream) {
Mono.from(head)
.zipWith(upstream.getHead().getHead())
.map {
val top = it.t1
val current = it.t2
return@map (top.number - current.number) < maxLag
}.subscribe { fresh ->
if (fresh) {
lock.withLock {
result = response
resolved = true
}
}
}
val lagging = upstream.getLag() > maxLag
if (!lagging) {
result.set(response)
}
}
override fun getResult(): ByteArray {
return result!!
return result.get()
}
}

2
src/main/kotlin/io/emeraldpay/dshackle/upstream/Upstream.kt
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@@ -11,4 +11,6 @@ interface Upstream {
fun getApi(matcher: Selector.Matcher): EthereumApi
fun getOptions(): UpstreamsConfig.Options
fun getSupportedTargets(): Set<String>
fun setLag(lag: Long)
fun getLag(): Long
}