feat(pd): integrate pd-service into hugegraph

hugegraph-pd/hg-pd-client/src/main/java/org/apache/hugegraph/pd/client/Discoverable.java

@@ -17,9 +17,11 @@
 
 package org.apache.hugegraph.pd.client;
 
+import org.apache.hugegraph.pd.common.Useless;
 import org.apache.hugegraph.pd.grpc.discovery.NodeInfos;
 import org.apache.hugegraph.pd.grpc.discovery.Query;
 
+@Useless("discovery related")
 public interface Discoverable {
 
     NodeInfos getNodeInfos(Query query);

hugegraph-pd/hg-pd-client/src/main/java/org/apache/hugegraph/pd/client/DiscoveryClient.java

@@ -28,6 +28,7 @@
 import java.util.function.Function;
 
 import org.apache.hugegraph.pd.common.PDException;
+import org.apache.hugegraph.pd.common.Useless;
 import org.apache.hugegraph.pd.grpc.discovery.DiscoveryServiceGrpc;
 import org.apache.hugegraph.pd.grpc.discovery.NodeInfo;
 import org.apache.hugegraph.pd.grpc.discovery.NodeInfos;
@@ -38,6 +39,7 @@
 import io.grpc.ManagedChannelBuilder;
 import lombok.extern.slf4j.Slf4j;
 
+@Useless("discovery related")
 @Slf4j
 public abstract class DiscoveryClient implements Closeable, Discoverable {
 

hugegraph-pd/hg-pd-client/src/main/java/org/apache/hugegraph/pd/client/DiscoveryClientImpl.java

@@ -20,9 +20,11 @@
 import java.util.Map;
 import java.util.function.Consumer;
 
+import org.apache.hugegraph.pd.common.Useless;
 import org.apache.hugegraph.pd.grpc.discovery.NodeInfo;
 import org.apache.hugegraph.pd.grpc.discovery.RegisterType;
 
+@Useless("discovery related")
 public class DiscoveryClientImpl extends DiscoveryClient {
 
     private final String id;

hugegraph-pd/hg-pd-client/src/main/java/org/apache/hugegraph/pd/client/LicenseClient.java

@@ -18,6 +18,7 @@
 package org.apache.hugegraph.pd.client;
 
 import org.apache.hugegraph.pd.common.KVPair;
+import org.apache.hugegraph.pd.common.Useless;
 import org.apache.hugegraph.pd.grpc.PDGrpc;
 import org.apache.hugegraph.pd.grpc.Pdpb;
 
@@ -27,6 +28,7 @@
 import io.grpc.stub.AbstractStub;
 import lombok.extern.slf4j.Slf4j;
 
+@Useless("license related")
 @Slf4j
 public class LicenseClient extends AbstractClient {
 

hugegraph-pd/hg-pd-common/src/main/java/org/apache/hugegraph/pd/common/Useless.java

@@ -0,0 +1,34 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.hugegraph.pd.common;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * The "Useless" annotation indicates that the annotated object can be safely removed without
+ * affecting existing functionality, including objects that are only referenced in tests.
+ */
+@Target({ElementType.FIELD, ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.TYPE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface Useless {
+
+    String value() default "Remove or handle it later";
+}

hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/DiscoveryMetaStore.java

@@ -23,13 +23,15 @@
 
 import org.apache.commons.lang3.StringUtils;
 import org.apache.hugegraph.pd.common.PDException;
+import org.apache.hugegraph.pd.common.Useless;
 import org.apache.hugegraph.pd.config.PDConfig;
 import org.apache.hugegraph.pd.grpc.discovery.NodeInfo;
 import org.apache.hugegraph.pd.grpc.discovery.NodeInfos;
 import org.apache.hugegraph.pd.grpc.discovery.Query;
 
 import lombok.extern.slf4j.Slf4j;
 
+@Useless("discovery related")
 @Slf4j
 public class DiscoveryMetaStore extends MetadataRocksDBStore {
 

hugegraph-pd/hg-pd-service/pom.xml

@@ -0,0 +1,166 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You 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.
+  -->
+
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.apache.hugegraph</groupId>
+        <artifactId>hugegraph-pd</artifactId>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>hg-pd-service</artifactId>
+
+    <properties>
+        <jetcd-version>0.5.10</jetcd-version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.hugegraph</groupId>
+            <artifactId>hg-pd-grpc</artifactId>
+            <exclusions>
+                <exclusion>
+                    <groupId>io.grpc</groupId>
+                    <artifactId>*</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.hugegraph</groupId>
+            <artifactId>hg-pd-core</artifactId>
+            <version>${revision}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>io.github.lognet</groupId>
+            <artifactId>grpc-spring-boot-starter</artifactId>
+            <version>4.5.5</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.springframework.boot</groupId>
+                    <artifactId>spring-boot-starter-logging</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <version>2.5.14</version>
+            <!-- Exclude the Tomcat dependency -->
+            <exclusions>
+                <!-- Exclude the Tomcat dependency -->
+                <exclusion>
+                    <groupId>org.springframework.boot</groupId>
+                    <artifactId>spring-boot-starter-tomcat</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>org.springframework.boot</groupId>
+                    <artifactId>spring-boot-starter-logging</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+            <version>2.5.14</version>
+        </dependency>
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-registry-prometheus</artifactId>
+            <version>1.7.12</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-jetty</artifactId>
+            <version>2.5.14</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-log4j2</artifactId>
+            <version>2.5.14</version>
+            <exclusions>
+                <exclusion>
+                    <artifactId>log4j-slf4j-impl</artifactId>
+                    <groupId>org.apache.logging.log4j</groupId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>com.lmax</groupId>
+            <artifactId>disruptor</artifactId>
+            <version>3.4.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.24</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java-util -->
+        <dependency>
+            <groupId>com.google.protobuf</groupId>
+            <artifactId>protobuf-java-util</artifactId>
+            <version>3.17.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.hugegraph</groupId>
+            <artifactId>hugegraph-common</artifactId>
+            <version>1.2.0</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.apache.logging.log4j</groupId>
+                    <artifactId>log4j-api</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.7</version>
+            <scope>compile</scope>
+        </dependency>
+
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>2.5.0</version>
+                <executions>
+                    <execution>
+                        <configuration>
+                            <mainClass>
+                                org.apache.hugegraph.pd.boot.HugePDServer
+                            </mainClass>
+                        </configuration>
+                        <!-- should configure explicitly without spring-boot-starter-parent -->
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

hugegraph-pd/hg-pd-service/src/main/java/org/apache/hugegraph/pd/boot/HugePDServer.java

@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.hugegraph.pd.boot;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+
+import com.alipay.remoting.util.StringUtils;
+
+/**
+ * PD 服务启动类
+ */
+@ComponentScan(basePackages = {"org.apache.hugegraph.pd"})
+@SpringBootApplication
+public class HugePDServer {
+
+    public static void main(String[] args) {
+        String logPath = System.getProperty("logging.path");
+        if (StringUtils.isBlank(logPath)) {
+            // TODO: enhance logging configuration
+            System.setProperty("logging.path", "logs");
+            System.setProperty("com.alipay.remoting.client.log.level", "error");
+        }
+
+        SpringApplication.run(HugePDServer.class);
+        System.out.println("Hugegraph-pd started.");
+    }
+}

hugegraph-pd/hg-pd-service/src/main/java/org/apache/hugegraph/pd/metrics/MetricsConfig.java

@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.hugegraph.pd.metrics;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.actuate.autoconfigure.metrics.MeterRegistryCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import io.micrometer.core.instrument.MeterRegistry;
+
+@Configuration
+public class MetricsConfig {
+
+    @Autowired
+    private PDMetrics metrics;
+
+    @Bean
+    public MeterRegistryCustomizer<MeterRegistry> metricsCommonTags() {
+        return (registry) -> registry.config().commonTags("hg", "pd");
+    }
+
+    @Bean
+    public MeterRegistryCustomizer<MeterRegistry> registerMeters() {
+        return (registry) -> {
+            metrics.init(registry);
+        };
+    }
+
+}