feat: Add metrics base

buildSrc/src/main/kotlin/com.hedera.block.jpms-modules.gradle.kts

@@ -52,6 +52,11 @@ jvmDependencyConflicts.patch {
     }
     module("io.grpc:grpc-stub") { annotationLibraries.forEach { removeDependency(it) } }
     module("io.grpc:grpc-util") { annotationLibraries.forEach { removeDependency(it) } }
+    // Added for metrics and logging, but also several platform classes
+    module("io.prometheus:simpleclient") {
+        removeDependency("io.prometheus:simpleclient_tracer_otel")
+        removeDependency("io.prometheus:simpleclient_tracer_otel_agent")
+    }
 }
 
 // Fix or enhance the 'module-info.class' of third-party Modules. This is about the
@@ -95,4 +100,21 @@ extraJavaModuleInfo {
     // spotbugs
     module("com.github.spotbugs:spotbugs-annotations", "com.github.spotbugs.annotations")
     module("com.google.code.findbugs:jsr305", "java.annotation") { exportAllPackages() }
+
+    // needed for metrics and logging, but also several platform classes
+    module("com.goterl:resource-loader", "resource.loader")
+    module("com.goterl:lazysodium-java", "lazysodium.java")
+    module("org.hyperledger.besu:secp256k1", "org.hyperledger.besu.nativelib.secp256k1")
+    module("io.prometheus:simpleclient", "io.prometheus.simpleclient")
+    module("io.prometheus:simpleclient_common", "io.prometheus.simpleclient_common")
+    module("io.prometheus:simpleclient_httpserver", "io.prometheus.simpleclient.httpserver") {
+        exportAllPackages()
+        requireAllDefinedDependencies()
+        requires("jdk.httpserver")
+    }
+
+    // Annotation processing only
+    module("com.google.auto.service:auto-service-annotations", "com.google.auto.service")
+    module("com.google.auto.service:auto-service", "com.google.auto.service.processor")
+    module("com.google.auto:auto-common", "com.google.auto.common")
 }

buildSrc/src/main/kotlin/com.hedera.block.repositories.gradle.kts

@@ -14,4 +14,10 @@
  * limitations under the License.
  */
 
-repositories { mavenCentral() }
+repositories {
+    mavenCentral()
+    maven {
+        url = uri("https://hyperledger.jfrog.io/artifactory/besu-maven")
+        content { includeGroupByRegex("org\\.hyperledger\\..*") }
+    }
+}

gradle/modules.properties

@@ -1,4 +1,12 @@
-com.github.spotbugs.annotations=com.github.spotbugs:spotbugs-annotations
+com.swirlds.metrics.api=com.swirlds:swirlds-metrics-api
+com.swirlds.metrics.impl=com.swirlds:swirlds-metrics-impl
+com.swirlds.common=com.swirlds:swirlds-common
+com.swirlds.config.impl=com.swirlds:swirlds-config-impl
+com.swirlds.config.extensions=com.swirlds:swirlds-config-extensions
+com.swirlds.config.processor=com.swirlds:swirlds-config-processor
+com.google.auto.service=com.google.auto.service:auto-service-annotations
+com.google.auto.service.processor=com.google.auto.service:auto-service
+com.google.auto.common=com.google.auto:auto-common
 io.helidon.webserver=io.helidon.webserver:helidon-webserver
 io.helidon.webserver.grpc=io.helidon.webserver:helidon-webserver-grpc
 io.helidon.webserver.testing.junit5=io.helidon.webserver.testing.junit5:helidon-webserver-testing-junit5

server/build.gradle.kts

@@ -24,6 +24,11 @@ application {
     mainClass = "com.hedera.block.server.Server"
 }
 
+mainModuleInfo {
+    annotationProcessor("com.google.auto.service.processor")
+    runtimeOnly("com.swirlds.config.impl")
+}
+
 testModuleInfo {
     requires("org.junit.jupiter.api")
     requires("org.mockito")

server/docs/metrics.md

@@ -0,0 +1,37 @@
+# Metrics
+This document describes the metrics that are available in the system, its purpose, and how to use them.
+
+## Overview
+We are using Prometheus to collect metrics from the system, through the use of [Hedera Platform SDK - Metrics](https://github.com/hashgraph/hedera-services/blob/develop/platform-sdk/docs/base/metrics/metrics.md).
+
+
+## Purpose
+
+The purpose of metrics is to provide a way to measure the performance of the system. Metrics are used to monitor the system and to detect any issues that may arise. Metrics can be used to identify bottlenecks, track the performance of the system over time, and to help diagnose problems.
+
+## Configuration
+
+### Prometheus
+
+Prefix: prometheus, ie. `prometheus.configKey`
+
+| ConfigKey                  | Description                                                                           | Default     |
+|----------------------------|---------------------------------------------------------------------------------------|-------------|
+| enableEndpoint             | either `true` or `false`. Enables or disables the endpoint for metrics                | true        |
+| endpointPortNumber         | Port of the Prometheus endpoint                                                       | 9999        |
+| endpointMaxBacklogAllowed  | The maximum number of incoming TCP connections which the system will queue internally | 1           |
+
+## Usage
+All classes that need to observe metrics can get them from the BlockNodeContext.
+
+If a new metric is needed, it can be added to MetricsService, and then used in the classes that need it. This is to avoid having to define the metrics in several places.
+MetricsService centralizes the creation of metrics and provides a way to access them from any other class.
+
+To check the metrics you can access the Prometheus endpoint at `http://localhost:9999/metrics`.
+
+## Existing Metrics
+
+| Metric Name    | Description               | Type    |
+|----------------|---------------------------|---------|
+| exampleGauge   | An example gauge metric   | Gauge   |
+| exampleCounter | An example counter metric | Counter |

server/src/main/java/com/hedera/block/server/Server.java

@@ -19,7 +19,10 @@
 import static com.hedera.block.server.Constants.*;
 
 import com.hedera.block.protos.BlockStreamServiceGrpcProto;
+import com.hedera.block.server.config.BlockNodeContext;
+import com.hedera.block.server.config.BlockNodeContextFactory;
 import com.hedera.block.server.mediator.LiveStreamMediatorImpl;
+import com.hedera.block.server.metrics.MetricsService;
 import com.hedera.block.server.persistence.WriteThroughCacheHandler;
 import com.hedera.block.server.persistence.storage.BlockStorage;
 import com.hedera.block.server.persistence.storage.FileSystemBlockStorage;
@@ -57,6 +60,12 @@ private Server() {}
     public static void main(final String[] args) {
 
         try {
+            // init metrics
+            BlockNodeContext blockNodeContext = BlockNodeContextFactory.create();
+
+            // increase by 1 just for the sake of an example
+            MetricsService metricsService = blockNodeContext.metricsService();
+            metricsService.exampleCounter.increment();
 
             // Set the global configuration
             final Config config = Config.create();

server/src/main/java/com/hedera/block/server/config/BlockNodeConfigExtension.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2024 Hedera Hashgraph, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hedera.block.server.config;
+
+import com.google.auto.service.AutoService;
+import com.swirlds.common.config.BasicCommonConfig;
+import com.swirlds.common.metrics.config.MetricsConfig;
+import com.swirlds.common.metrics.platform.prometheus.PrometheusConfig;
+import com.swirlds.config.api.ConfigurationExtension;
+import edu.umd.cs.findbugs.annotations.NonNull;
+import java.util.Set;
+
+/** Registers configuration types for the server. */
+@AutoService(ConfigurationExtension.class)
+public class BlockNodeConfigExtension implements ConfigurationExtension {
+
+    /**
+     * {@inheritDoc}
+     *
+     * @return Set of configuration data types for the server
+     */
+    @NonNull
+    @Override
+    public Set<Class<? extends Record>> getConfigDataTypes() {
+        return Set.of(BasicCommonConfig.class, MetricsConfig.class, PrometheusConfig.class);
+    }
+}

server/src/main/java/com/hedera/block/server/config/BlockNodeContext.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2024 Hedera Hashgraph, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hedera.block.server.config;
+
+import com.hedera.block.server.metrics.MetricsService;
+import com.swirlds.config.api.Configuration;
+import com.swirlds.metrics.api.Metrics;
+import edu.umd.cs.findbugs.annotations.NonNull;
+
+/**
+ * Context for the block node. This record is returned by the BlockNodeContextFactory when a new
+ * configuration is created.
+ *
+ * @param metrics the metrics used for monitoring and reporting
+ * @param metricsService the service responsible for handling metrics
+ * @param configuration the configuration settings for the block node
+ */
+public record BlockNodeContext(
+        @NonNull Metrics metrics,
+        @NonNull MetricsService metricsService,
+        @NonNull Configuration configuration) {}

server/src/main/java/com/hedera/block/server/config/BlockNodeContextFactory.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2024 Hedera Hashgraph, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hedera.block.server.config;
+
+import com.hedera.block.server.metrics.MetricsService;
+import com.swirlds.common.metrics.platform.DefaultMetricsProvider;
+import com.swirlds.config.api.Configuration;
+import com.swirlds.config.api.ConfigurationBuilder;
+import com.swirlds.config.extensions.sources.ClasspathFileConfigSource;
+import com.swirlds.config.extensions.sources.SystemEnvironmentConfigSource;
+import com.swirlds.config.extensions.sources.SystemPropertiesConfigSource;
+import com.swirlds.metrics.api.Metrics;
+import edu.umd.cs.findbugs.annotations.NonNull;
+import java.io.IOException;
+import java.nio.file.Path;
+
+/** Static factory that creates {@link BlockNodeContext} */
+public class BlockNodeContextFactory {
+
+    private static final String APPLICATION_PROPERTIES_1 = "app.properties";
+
+    private BlockNodeContextFactory() {}
+
+    /**
+     * @return an instance of {@link BlockNodeContext} which holds {@link Configuration}, {@link
+     *     Metrics} and {@link MetricsService} for the rest of the application to use.
+     */
+    public static BlockNodeContext create() throws IOException {
+        final Configuration configuration = getConfiguration();
+        final Metrics metrics = getMetrics(configuration);
+        final MetricsService metricsService = new MetricsService(metrics);
+        return new BlockNodeContext(metrics, metricsService, configuration);
+    }
+
+    private static Configuration getConfiguration() throws IOException {
+
+        return ConfigurationBuilder.create()
+                .withSource(SystemEnvironmentConfigSource.getInstance())
+                .withSource(SystemPropertiesConfigSource.getInstance())
+                .withSource(new ClasspathFileConfigSource(Path.of(APPLICATION_PROPERTIES_1)))
+                .autoDiscoverExtensions()
+                .build();
+    }
+
+    @NonNull
+    private static Metrics getMetrics(@NonNull final Configuration configuration) {
+        final DefaultMetricsProvider metricsProvider = new DefaultMetricsProvider(configuration);
+        final Metrics metrics = metricsProvider.createGlobalMetrics();
+        metricsProvider.start();
+        return metrics;
+    }
+}

server/src/main/java/com/hedera/block/server/metrics/MetricsService.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2024 Hedera Hashgraph, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hedera.block.server.metrics;
+
+import com.swirlds.metrics.api.Counter;
+import com.swirlds.metrics.api.LongGauge;
+import com.swirlds.metrics.api.Metrics;
+import edu.umd.cs.findbugs.annotations.NonNull;
+
+public class MetricsService {
+
+    private static final String CATEGORY = "app";
+
+    private static final LongGauge.Config EXAMPLE_GAUGE =
+            new LongGauge.Config(CATEGORY, "exampleGauge").withDescription("An example gauge");
+
+    /** An example gauge. */
+    public final LongGauge exampleGauge;
+
+    private static final Counter.Config EXAMPLE_COUNTER =
+            new Counter.Config(CATEGORY, "exampleCounter").withDescription("An example counter");
+
+    /** An example counter. */
+    public final Counter exampleCounter;
+
+    /**
+     * Creates a new instance of {@link MetricsService}.
+     *
+     * @param metrics the metrics instance
+     */
+    public MetricsService(@NonNull final Metrics metrics) {
+        this.exampleGauge = metrics.getOrCreate(EXAMPLE_GAUGE);
+        this.exampleCounter = metrics.getOrCreate(EXAMPLE_COUNTER);
+    }
+}

server/src/main/java/module-info.java

@@ -1,11 +1,21 @@
+import com.hedera.block.server.config.BlockNodeConfigExtension;
+
 /** Runtime module of the server. */
 module com.hedera.block.server {
     requires com.hedera.block.protos;
     requires com.google.protobuf;
+    requires com.swirlds.common;
+    requires com.swirlds.config.api;
+    requires com.swirlds.config.extensions;
+    requires com.swirlds.metrics.api;
     requires io.grpc.stub;
     requires io.helidon.common;
     requires io.helidon.config;
     requires io.helidon.webserver.grpc;
     requires io.helidon.webserver;
     requires static com.github.spotbugs.annotations;
+    requires static com.google.auto.service;
+
+    provides com.swirlds.config.api.ConfigurationExtension with
+            BlockNodeConfigExtension;
 }

server/src/main/resources/app.properties

@@ -0,0 +1 @@
+prometheus.endpointPortNumber=9999

server/src/test/java/com/hedera/block/server/config/BlockNodeContextFactoryTest.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2024 Hedera Hashgraph, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hedera.block.server.config;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.io.IOException;
+import org.junit.jupiter.api.Test;
+
+class BlockNodeContextFactoryTest {
+
+    @Test
+    void create_returnsBlockNodeContext() throws IOException {
+        BlockNodeContext context = BlockNodeContextFactory.create();
+
+        assertNotNull(context.metrics());
+        assertNotNull(context.configuration());
+    }
+}