[WIP] Features safe time

chain/build.gradle

@@ -6,7 +6,7 @@ dependencies {
   implementation project(':db:core')
   implementation project(':pow:core')
   api project(':ssz')
-  implementation project(':util')
+  implementation project(':util:core')
 
   implementation 'com.google.guava:guava'
   implementation 'io.projectreactor:reactor-core'

consensus/build.gradle

@@ -3,7 +3,7 @@ dependencies {
   implementation project(':core')
   implementation project(':crypto')
   implementation project(':ssz')
-  implementation project(':util')
+  implementation project(':util:core')
 
   implementation 'com.google.guava:guava'
 

core/build.gradle

@@ -1,5 +1,5 @@
 dependencies {
-  implementation project(':types')
+  api project(':types')
   implementation project(':crypto')
   implementation project(':ssz')
 

pow/core/build.gradle

@@ -3,7 +3,7 @@ dependencies {
   implementation project(':core')
   implementation project(':consensus')
   implementation project(':ssz')
-  implementation project(':util')
+  implementation project(':util:core')
   implementation project(':crypto')
 
   implementation 'io.projectreactor:reactor-core'

pow/ethereumj/build.gradle

@@ -9,7 +9,7 @@ dependencies {
   implementation project(':types')
   implementation project(':core')
   implementation project(':consensus')
-  implementation project(':util')
+  implementation project(':util:core')
   implementation ("org.ethereum:ethereumj-core") {
     changing = true
 

pow/validator/build.gradle

@@ -7,7 +7,7 @@ dependencies {
   implementation project(':chain')
   implementation project(':consensus')
   implementation project(':validator')
-  implementation project(':util')
+  implementation project(':util:core')
   implementation project(':db:core')
 
   implementation 'io.projectreactor:reactor-core'

settings.gradle

@@ -38,7 +38,9 @@ include 'test'
 // Strict types definition
 include 'types'
 // Standalone utils without any relation to Ethereum 2.0
-include 'util'
+include 'util:core'
+// Eth2.0 time utilities
+include 'util:time'
 // Validator services
 include 'validator'
 // Wire API mock

ssz/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'java-library'
 
 dependencies {
     implementation project(':types')
-    implementation project(':util')
+    implementation project(':util:core')
     implementation 'net.consensys.cava:cava-ssz'
     implementation 'net.consensys.cava:cava-units'
 

start/benchmaker/build.gradle

@@ -10,7 +10,7 @@ application {
 dependencies {
   implementation project(':types')
   implementation project(':wire')
-  implementation project(':util')
+  implementation project(':util:core')
   implementation project(':start:common')
   implementation project(':start:config')
   implementation project(':crypto')

start/common/build.gradle

@@ -9,7 +9,7 @@ dependencies {
   implementation project(':ssz')
   implementation project(':validator')
   implementation project(':wire')
-  implementation project(':util')
+  implementation project(':util:core')
 
   implementation 'com.google.guava:guava'
   implementation 'io.projectreactor:reactor-core'

start/config/build.gradle

@@ -3,7 +3,7 @@ dependencies {
   implementation project(':consensus')
   implementation project(':crypto')
   implementation project(':types')
-  implementation project(':util')
+  implementation project(':util:core')
 
   implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-yaml'
   implementation 'com.fasterxml.jackson.core:jackson-databind'

start/node/build.gradle

@@ -10,7 +10,7 @@ application {
 dependencies {
   implementation project(':types')
   implementation project(':wire')
-  implementation project(':util')
+  implementation project(':util:core')
   implementation project(':start:common')
   implementation project(':start:config')
   implementation project(':crypto')

start/simulator/build.gradle

@@ -16,7 +16,7 @@ createScript(project, 'org.ethereum.beacon.simulator.Simulator', 'simulator')
 dependencies {
   implementation project(':types')
   implementation project(':wire')
-  implementation project(':util')
+  implementation project(':util:core')
   implementation project(':start:common')
   implementation project(':start:config')
   implementation project(':crypto')

test/build.gradle

@@ -11,7 +11,7 @@ dependencies {
   testImplementation project(':db:core')
   testImplementation project(':chain')
   testImplementation project(':start:simulator')
-  testImplementation project(':util')
+  testImplementation project(':util:core')
   testImplementation project(':pow:core')
 }
 

util/build.gradle

@@ -1,5 +0,0 @@
-dependencies {
-  implementation 'io.projectreactor:reactor-core'
-  implementation 'com.google.guava:guava'
-  implementation 'commons-beanutils:commons-beanutils'
-}

util/core/build.gradle

@@ -0,0 +1,5 @@
+dependencies {
+  implementation 'io.projectreactor:reactor-core'
+  implementation 'com.google.guava:guava'
+  implementation 'commons-beanutils:commons-beanutils'
+}

util/time/build.gradle

@@ -0,0 +1,12 @@
+dependencies {
+  implementation project(':util:core')
+  implementation project(':core')
+
+  implementation 'io.projectreactor:reactor-core'
+  implementation 'commons-net:commons-net'
+  implementation 'org.apache.logging.log4j:log4j-core'
+
+  testImplementation project(':consensus')
+  testImplementation project(':ssz')
+  testImplementation 'junit:junit'
+}

util/time/src/main/java/org/ethereum/beacon/time/NetworkFirstStrategy.java

@@ -0,0 +1,60 @@
+package org.ethereum.beacon.time;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.ethereum.beacon.core.types.Time;
+import org.ethereum.beacon.schedulers.Scheduler;
+import org.ethereum.beacon.stream.SimpleProcessor;
+import org.ethereum.beacon.time.provider.NetworkTime;
+import org.ethereum.beacon.time.provider.StatisticsTime;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+/**
+ * Strategy which prioritize {@link NetworkTime} but if the delta between {@link NetworkTime} and
+ * {@link StatisticsTime} goes above allowedDelta, it uses {@link StatisticsTime} as time provider.
+ */
+public class NetworkFirstStrategy implements TimeStrategy {
+  private final SimpleProcessor<Time> timeProcessor;
+  private final AtomicLong latestNetwork = new AtomicLong(-1);
+  private final AtomicLong latestStatistics = new AtomicLong(-1);
+  private static final Logger logger = LogManager.getLogger("time");
+
+  public NetworkFirstStrategy(
+      Scheduler scheduler,
+      NetworkTime networkTime,
+      StatisticsTime statisticsTime,
+      int allowedDelta) {
+    this.timeProcessor = new SimpleProcessor<Time>(scheduler, "NetworkFirstStrategy");
+    Flux.from(networkTime.getTimeStream())
+        .subscribe(
+            t -> {
+              this.latestNetwork.set(t.getValue());
+              if (latestStatistics.get() == -1) {
+                return;
+              }
+              if (Math.abs(latestNetwork.get() - latestStatistics.get()) <= allowedDelta) {
+                timeProcessor.onNext(t);
+              }
+            });
+    Flux.from(statisticsTime.getTimeStream())
+        .subscribe(
+            t -> {
+              this.latestStatistics.set(t.getValue());
+              if (latestNetwork.get() == -1) {
+                return;
+              }
+              if (Math.abs(latestNetwork.get() - latestStatistics.get()) > allowedDelta) {
+                logger.trace(() -> String.format("Using time from statistics time provider: %s", t.getValue()));
+                timeProcessor.onNext(t);
+              }
+            });
+  }
+
+  @Override
+  public Publisher<Time> getTimeStream() {
+    return timeProcessor;
+  }
+}

util/time/src/main/java/org/ethereum/beacon/time/StatisticsStrategy.java

@@ -0,0 +1,18 @@
+package org.ethereum.beacon.time;
+
+import org.ethereum.beacon.core.types.Time;
+import org.ethereum.beacon.time.provider.StatisticsTime;
+import org.reactivestreams.Publisher;
+
+public class StatisticsStrategy implements TimeStrategy {
+  private final StatisticsTime statisticsTime;
+
+  public StatisticsStrategy(StatisticsTime statisticsTime) {
+    this.statisticsTime = statisticsTime;
+  }
+
+  @Override
+  public Publisher<Time> getTimeStream() {
+    return statisticsTime.getTimeStream();
+  }
+}

util/time/src/main/java/org/ethereum/beacon/time/TimeStrategy.java

@@ -0,0 +1,12 @@
+package org.ethereum.beacon.time;
+
+import org.ethereum.beacon.core.types.Time;
+import org.reactivestreams.Publisher;
+
+/**
+ * High level time supplier, uses several {@link org.ethereum.beacon.time.provider.TimeProvider} to
+ * produce result time
+ */
+public interface TimeStrategy {
+  Publisher<Time> getTimeStream();
+}

util/time/src/main/java/org/ethereum/beacon/time/mapper/ObjectTimeMapper.java

@@ -0,0 +1,30 @@
+package org.ethereum.beacon.time.mapper;
+
+import org.ethereum.beacon.core.types.Time;
+import org.ethereum.beacon.schedulers.Scheduler;
+import org.ethereum.beacon.stream.SimpleProcessor;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+
+import java.util.function.Function;
+
+public class ObjectTimeMapper<T> implements TimeMapper {
+  private final Function<T, Time> timeFunc;
+  private final SimpleProcessor<Time> timeProcessor;
+
+  public ObjectTimeMapper(
+      Scheduler scheduler, Publisher<T> objectStream, Function<T, Time> timeFunc) {
+    this.timeProcessor = new SimpleProcessor<>(scheduler, "TimeMapper");
+    this.timeFunc = timeFunc;
+    Flux.from(objectStream).map(this::mapObjectFunc).subscribe(timeProcessor::onNext);
+  }
+
+  Time mapObjectFunc(T obj) {
+    return timeFunc.apply(obj);
+  }
+
+  @Override
+  public Publisher<Time> getTimeStream() {
+    return timeProcessor;
+  }
+}

util/time/src/main/java/org/ethereum/beacon/time/mapper/TimeMapper.java

@@ -0,0 +1,9 @@
+package org.ethereum.beacon.time.mapper;
+
+import org.ethereum.beacon.core.types.Time;
+import org.reactivestreams.Publisher;
+
+/** Maps stream of objects with some kind of time info to time stream */
+public interface TimeMapper {
+  Publisher<Time> getTimeStream();
+}